94 files changed, 7817 insertions, 1276 deletions

diff --git a/application/ApplicationUtils.php b/application/ApplicationUtils.php
index 7fe3cb32..3aa21829 100644
--- a/application/ApplicationUtils.php
+++ b/application/ApplicationUtils.php
@@ -150,6 +150,8 @@ class ApplicationUtils
      * @param string $minVersion minimum PHP required version
      * @param string $curVersion current PHP version (use PHP_VERSION)
      *
+     * @return bool true on success
+     *
      * @throws Exception the PHP version is not supported
      */
     public static function checkPHPVersion($minVersion, $curVersion)
@@ -163,6 +165,7 @@ class ApplicationUtils
             );
             throw new Exception(sprintf($msg, $minVersion));
         }
+        return true;
     }
 
     /**
diff --git a/application/History.php b/application/History.php
index a5846652..4fd2f294 100644
--- a/application/History.php
+++ b/application/History.php
@@ -3,6 +3,7 @@ namespace Shaarli;
 
 use DateTime;
 use Exception;
+use Shaarli\Bookmark\Bookmark;
 
 /**
  * Class History
@@ -20,7 +21,7 @@ use Exception;
  *   - UPDATED: link updated
  *   - DELETED: link deleted
  *   - SETTINGS: the settings have been updated through the UI.
- *   - IMPORT: bulk links import
+ *   - IMPORT: bulk bookmarks import
  *
  * Note: new events are put at the beginning of the file and history array.
  */
@@ -96,31 +97,31 @@ class History
     /**
      * Add Event: new link.
      *
-     * @param array $link Link data.
+     * @param Bookmark $link Link data.
      */
     public function addLink($link)
     {
-        $this->addEvent(self::CREATED, $link['id']);
+        $this->addEvent(self::CREATED, $link->getId());
     }
 
     /**
      * Add Event: update existing link.
      *
-     * @param array $link Link data.
+     * @param Bookmark $link Link data.
      */
     public function updateLink($link)
     {
-        $this->addEvent(self::UPDATED, $link['id']);
+        $this->addEvent(self::UPDATED, $link->getId());
     }
 
     /**
      * Add Event: delete existing link.
      *
-     * @param array $link Link data.
+     * @param Bookmark $link Link data.
      */
     public function deleteLink($link)
     {
-        $this->addEvent(self::DELETED, $link['id']);
+        $this->addEvent(self::DELETED, $link->getId());
     }
 
     /**
@@ -134,7 +135,7 @@ class History
     /**
      * Add Event: bulk import.
      *
-     * Note: we don't store links add/update one by one since it can have a huge impact on performances.
+     * Note: we don't store bookmarks add/update one by one since it can have a huge impact on performances.
      */
     public function importLinks()
     {
diff --git a/application/Languages.php b/application/Languages.php
index 5cda802e..d83e0765 100644
--- a/application/Languages.php
+++ b/application/Languages.php
@@ -179,9 +179,10 @@ class Languages
     {
         return [
             'auto' => t('Automatic'),
+            'de' => t('German'),
             'en' => t('English'),
             'fr' => t('French'),
-            'de' => t('German'),
+            'jp' => t('Japanese'),
         ];
     }
 }
diff --git a/application/Router.php b/application/Router.php
deleted file mode 100644
index d7187487..00000000
--- a/application/Router.php
+++ /dev/null
@@ -1,184 +0,0 @@
-<?php
-namespace Shaarli;
-
-/**
- * Class Router
- *
- * (only displayable pages here)
- */
-class Router
-{
-    public static $AJAX_THUMB_UPDATE = 'ajax_thumb_update';
-
-    public static $PAGE_LOGIN = 'login';
-
-    public static $PAGE_PICWALL = 'picwall';
-
-    public static $PAGE_TAGCLOUD = 'tagcloud';
-
-    public static $PAGE_TAGLIST = 'taglist';
-
-    public static $PAGE_DAILY = 'daily';
-
-    public static $PAGE_FEED_ATOM = 'atom';
-
-    public static $PAGE_FEED_RSS = 'rss';
-
-    public static $PAGE_TOOLS = 'tools';
-
-    public static $PAGE_CHANGEPASSWORD = 'changepasswd';
-
-    public static $PAGE_CONFIGURE = 'configure';
-
-    public static $PAGE_CHANGETAG = 'changetag';
-
-    public static $PAGE_ADDLINK = 'addlink';
-
-    public static $PAGE_EDITLINK = 'edit_link';
-
-    public static $PAGE_DELETELINK = 'delete_link';
-
-    public static $PAGE_CHANGE_VISIBILITY = 'change_visibility';
-
-    public static $PAGE_PINLINK = 'pin';
-
-    public static $PAGE_EXPORT = 'export';
-
-    public static $PAGE_IMPORT = 'import';
-
-    public static $PAGE_OPENSEARCH = 'opensearch';
-
-    public static $PAGE_LINKLIST = 'linklist';
-
-    public static $PAGE_PLUGINSADMIN = 'pluginadmin';
-
-    public static $PAGE_SAVE_PLUGINSADMIN = 'save_pluginadmin';
-
-    public static $PAGE_THUMBS_UPDATE = 'thumbs_update';
-
-    public static $GET_TOKEN = 'token';
-
-    /**
-     * Reproducing renderPage() if hell, to avoid regression.
-     *
-     * This highlights how bad this needs to be rewrite,
-     * but let's focus on plugins for now.
-     *
-     * @param string $query    $_SERVER['QUERY_STRING'].
-     * @param array  $get      $_SERVER['GET'].
-     * @param bool   $loggedIn true if authenticated user.
-     *
-     * @return string page found.
-     */
-    public static function findPage($query, $get, $loggedIn)
-    {
-        $loggedIn = ($loggedIn === true) ? true : false;
-
-        if (empty($query) && !isset($get['edit_link']) && !isset($get['post'])) {
-            return self::$PAGE_LINKLIST;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_LOGIN) && $loggedIn === false) {
-            return self::$PAGE_LOGIN;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_PICWALL)) {
-            return self::$PAGE_PICWALL;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_TAGCLOUD)) {
-            return self::$PAGE_TAGCLOUD;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_TAGLIST)) {
-            return self::$PAGE_TAGLIST;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_OPENSEARCH)) {
-            return self::$PAGE_OPENSEARCH;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_DAILY)) {
-            return self::$PAGE_DAILY;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_FEED_ATOM)) {
-            return self::$PAGE_FEED_ATOM;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_FEED_RSS)) {
-            return self::$PAGE_FEED_RSS;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_THUMBS_UPDATE)) {
-            return self::$PAGE_THUMBS_UPDATE;
-        }
-
-        if (startsWith($query, 'do=' . self::$AJAX_THUMB_UPDATE)) {
-            return self::$AJAX_THUMB_UPDATE;
-        }
-
-        // At this point, only loggedin pages.
-        if (!$loggedIn) {
-            return self::$PAGE_LINKLIST;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_TOOLS)) {
-            return self::$PAGE_TOOLS;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_CHANGEPASSWORD)) {
-            return self::$PAGE_CHANGEPASSWORD;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_CONFIGURE)) {
-            return self::$PAGE_CONFIGURE;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_CHANGETAG)) {
-            return self::$PAGE_CHANGETAG;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_ADDLINK)) {
-            return self::$PAGE_ADDLINK;
-        }
-
-        if (isset($get['edit_link']) || isset($get['post'])) {
-            return self::$PAGE_EDITLINK;
-        }
-
-        if (isset($get['delete_link'])) {
-            return self::$PAGE_DELETELINK;
-        }
-
-        if (isset($get[self::$PAGE_CHANGE_VISIBILITY])) {
-            return self::$PAGE_CHANGE_VISIBILITY;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_PINLINK)) {
-            return self::$PAGE_PINLINK;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_EXPORT)) {
-            return self::$PAGE_EXPORT;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_IMPORT)) {
-            return self::$PAGE_IMPORT;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_PLUGINSADMIN)) {
-            return self::$PAGE_PLUGINSADMIN;
-        }
-
-        if (startsWith($query, 'do=' . self::$PAGE_SAVE_PLUGINSADMIN)) {
-            return self::$PAGE_SAVE_PLUGINSADMIN;
-        }
-
-        if (startsWith($query, 'do=' . self::$GET_TOKEN)) {
-            return self::$GET_TOKEN;
-        }
-
-        return self::$PAGE_LINKLIST;
-    }
-}
diff --git a/application/Thumbnailer.php b/application/Thumbnailer.php
index d5f5ac28..5aec23c8 100644
--- a/application/Thumbnailer.php
+++ b/application/Thumbnailer.php
@@ -4,7 +4,6 @@ namespace Shaarli;
 
 use Shaarli\Config\ConfigManager;
 use WebThumbnailer\Application\ConfigManager as WTConfigManager;
-use WebThumbnailer\Exception\WebThumbnailerException;
 use WebThumbnailer\WebThumbnailer;
 
 /**
@@ -27,6 +26,7 @@ class Thumbnailer
         'instagram.com',
         'pinterest.com',
         'pinterest.fr',
+        'soundcloud.com',
         'tumblr.com',
         'deviantart.com',
     ];
@@ -89,7 +89,7 @@ class Thumbnailer
 
         try {
             return $this->wt->thumbnail($url);
-        } catch (WebThumbnailerException $e) {
+        } catch (\Throwable $e) {
             // Exceptions are only thrown in debug mode.
             error_log(get_class($e) . ': ' . $e->getMessage());
         }
diff --git a/application/Utils.php b/application/Utils.php
index 925e1a22..bcfda65c 100644
--- a/application/Utils.php
+++ b/application/Utils.php
@@ -87,18 +87,22 @@ function endsWith($haystack, $needle, $case = true)
  *
  * @param mixed $input Data to escape: a single string or an array of strings.
  *
- * @return string escaped.
+ * @return string|array escaped.
  */
 function escape($input)
 {
-    if (is_bool($input)) {
+    if (null === $input) {
+        return null;
+    }
+
+    if (is_bool($input) || is_int($input) || is_float($input) || $input instanceof DateTimeInterface) {
         return $input;
     }
 
     if (is_array($input)) {
         $out = array();
         foreach ($input as $key => $value) {
-            $out[$key] = escape($value);
+            $out[escape($key)] = escape($value);
         }
         return $out;
     }
@@ -159,10 +163,10 @@ function checkDateFormat($format, $string)
  */
 function generateLocation($referer, $host, $loopTerms = array())
 {
-    $finalReferer = '?';
+    $finalReferer = './?';
 
     // No referer if it contains any value in $loopCriteria.
-    foreach ($loopTerms as $value) {
+    foreach (array_filter($loopTerms) as $value) {
         if (strpos($referer, $value) !== false) {
             return $finalReferer;
         }
@@ -294,15 +298,15 @@ function normalize_spaces($string)
  * Requires php-intl to display international datetimes,
  * otherwise default format '%c' will be returned.
  *
- * @param DateTime $date to format.
- * @param bool     $time Displays time if true.
- * @param bool     $intl Use international format if true.
+ * @param DateTimeInterface $date to format.
+ * @param bool              $time Displays time if true.
+ * @param bool              $intl Use international format if true.
  *
  * @return bool|string Formatted date, or false if the input is invalid.
  */
 function format_date($date, $time = true, $intl = true)
 {
-    if (! $date instanceof DateTime) {
+    if (! $date instanceof DateTimeInterface) {
         return false;
     }
 
diff --git a/application/api/ApiMiddleware.php b/application/api/ApiMiddleware.php
index 2d55bda6..f5b53b01 100644
--- a/application/api/ApiMiddleware.php
+++ b/application/api/ApiMiddleware.php
@@ -3,6 +3,7 @@ namespace Shaarli\Api;
 
 use Shaarli\Api\Exceptions\ApiAuthorizationException;
 use Shaarli\Api\Exceptions\ApiException;
+use Shaarli\Bookmark\BookmarkFileService;
 use Shaarli\Config\ConfigManager;
 use Slim\Container;
 use Slim\Http\Request;
@@ -70,7 +71,14 @@ class ApiMiddleware
             $response = $e->getApiResponse();
         }
 
-        return $response;
+        return $response
+            ->withHeader('Access-Control-Allow-Origin', '*')
+            ->withHeader(
+                'Access-Control-Allow-Headers',
+                'X-Requested-With, Content-Type, Accept, Origin, Authorization'
+            )
+            ->withHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS')
+        ;
     }
 
     /**
@@ -99,7 +107,9 @@ class ApiMiddleware
      */
     protected function checkToken($request)
     {
-        if (! $request->hasHeader('Authorization')) {
+        if (!$request->hasHeader('Authorization')
+            && !isset($this->container->environment['REDIRECT_HTTP_AUTHORIZATION'])
+        ) {
             throw new ApiAuthorizationException('JWT token not provided');
         }
 
@@ -107,7 +117,11 @@ class ApiMiddleware
             throw new ApiAuthorizationException('Token secret must be set in Shaarli\'s administration');
         }
 
-        $authorization = $request->getHeaderLine('Authorization');
+        if (isset($this->container->environment['REDIRECT_HTTP_AUTHORIZATION'])) {
+            $authorization = $this->container->environment['REDIRECT_HTTP_AUTHORIZATION'];
+        } else {
+            $authorization = $request->getHeaderLine('Authorization');
+        }
 
         if (! preg_match('/^Bearer (.*)/i', $authorization, $matches)) {
             throw new ApiAuthorizationException('Invalid JWT header');
@@ -117,7 +131,7 @@ class ApiMiddleware
     }
 
     /**
-     * Instantiate a new LinkDB including private links,
+     * Instantiate a new LinkDB including private bookmarks,
      * and load in the Slim container.
      *
      * FIXME! LinkDB could use a refactoring to avoid this trick.
@@ -126,10 +140,10 @@ class ApiMiddleware
      */
     protected function setLinkDb($conf)
     {
-        $linkDb = new \Shaarli\Bookmark\LinkDB(
-            $conf->get('resource.datastore'),
-            true,
-            $conf->get('privacy.hide_public_links')
+        $linkDb = new BookmarkFileService(
+            $conf,
+            $this->container->get('history'),
+            true
         );
         $this->container['db'] = $linkDb;
     }
diff --git a/application/api/ApiUtils.php b/application/api/ApiUtils.php
index 1e3ac02e..faebb8f5 100644
--- a/application/api/ApiUtils.php
+++ b/application/api/ApiUtils.php
@@ -2,6 +2,7 @@
 namespace Shaarli\Api;
 
 use Shaarli\Api\Exceptions\ApiAuthorizationException;
+use Shaarli\Bookmark\Bookmark;
 use Shaarli\Http\Base64Url;
 
 /**
@@ -15,6 +16,8 @@ class ApiUtils
      * @param string $token  JWT token extracted from the headers.
      * @param string $secret API secret set in the settings.
      *
+     * @return bool true on success
+     *
      * @throws ApiAuthorizationException the token is not valid.
      */
     public static function validateJwtToken($token, $secret)
@@ -45,33 +48,35 @@ class ApiUtils
         ) {
             throw new ApiAuthorizationException('Invalid JWT issued time');
         }
+
+        return true;
     }
 
     /**
      * Format a Link for the REST API.
      *
-     * @param array  $link     Link data read from the datastore.
-     * @param string $indexUrl Shaarli's index URL (used for relative URL).
+     * @param Bookmark $bookmark Bookmark data read from the datastore.
+     * @param string   $indexUrl Shaarli's index URL (used for relative URL).
      *
      * @return array Link data formatted for the REST API.
      */
-    public static function formatLink($link, $indexUrl)
+    public static function formatLink($bookmark, $indexUrl)
     {
-        $out['id'] = $link['id'];
+        $out['id'] = $bookmark->getId();
         // Not an internal link
-        if (! is_note($link['url'])) {
-            $out['url'] = $link['url'];
+        if (! $bookmark->isNote()) {
+            $out['url'] = $bookmark->getUrl();
         } else {
-            $out['url'] = $indexUrl . $link['url'];
+            $out['url'] = rtrim($indexUrl, '/') . '/' . ltrim($bookmark->getUrl(), '/');
         }
-        $out['shorturl'] = $link['shorturl'];
-        $out['title'] = $link['title'];
-        $out['description'] = $link['description'];
-        $out['tags'] = preg_split('/\s+/', $link['tags'], -1, PREG_SPLIT_NO_EMPTY);
-        $out['private'] = $link['private'] == true;
-        $out['created'] = $link['created']->format(\DateTime::ATOM);
-        if (! empty($link['updated'])) {
-            $out['updated'] = $link['updated']->format(\DateTime::ATOM);
+        $out['shorturl'] = $bookmark->getShortUrl();
+        $out['title'] = $bookmark->getTitle();
+        $out['description'] = $bookmark->getDescription();
+        $out['tags'] = $bookmark->getTags();
+        $out['private'] = $bookmark->isPrivate();
+        $out['created'] = $bookmark->getCreated()->format(\DateTime::ATOM);
+        if (! empty($bookmark->getUpdated())) {
+            $out['updated'] = $bookmark->getUpdated()->format(\DateTime::ATOM);
         } else {
             $out['updated'] = '';
         }
@@ -79,7 +84,7 @@ class ApiUtils
     }
 
     /**
-     * Convert a link given through a request, to a valid link for LinkDB.
+     * Convert a link given through a request, to a valid Bookmark for the datastore.
      *
      * If no URL is provided, it will generate a local note URL.
      * If no title is provided, it will use the URL as title.
@@ -87,50 +92,42 @@ class ApiUtils
      * @param array  $input          Request Link.
      * @param bool   $defaultPrivate Request Link.
      *
-     * @return array Formatted link.
+     * @return Bookmark instance.
      */
     public static function buildLinkFromRequest($input, $defaultPrivate)
     {
-        $input['url'] = ! empty($input['url']) ? cleanup_url($input['url']) : '';
+        $bookmark = new Bookmark();
+        $url = ! empty($input['url']) ? cleanup_url($input['url']) : '';
         if (isset($input['private'])) {
             $private = filter_var($input['private'], FILTER_VALIDATE_BOOLEAN);
         } else {
             $private = $defaultPrivate;
         }
 
-        $link = [
-            'title'         => ! empty($input['title']) ? $input['title'] : $input['url'],
-            'url'           => $input['url'],
-            'description'   => ! empty($input['description']) ? $input['description'] : '',
-            'tags'          => ! empty($input['tags']) ? implode(' ', $input['tags']) : '',
-            'private'       => $private,
-            'created'       => new \DateTime(),
-        ];
-        return $link;
+        $bookmark->setTitle(! empty($input['title']) ? $input['title'] : '');
+        $bookmark->setUrl($url);
+        $bookmark->setDescription(! empty($input['description']) ? $input['description'] : '');
+        $bookmark->setTags(! empty($input['tags']) ? $input['tags'] : []);
+        $bookmark->setPrivate($private);
+
+        return $bookmark;
     }
 
     /**
      * Update link fields using an updated link object.
      *
-     * @param array $oldLink data
-     * @param array $newLink data
+     * @param Bookmark $oldLink data
+     * @param Bookmark $newLink data
      *
-     * @return array $oldLink updated with $newLink values
+     * @return Bookmark $oldLink updated with $newLink values
      */
     public static function updateLink($oldLink, $newLink)
     {
-        foreach (['title', 'url', 'description', 'tags', 'private'] as $field) {
-            $oldLink[$field] = $newLink[$field];
-        }
-        $oldLink['updated'] = new \DateTime();
-
-        if (empty($oldLink['url'])) {
-            $oldLink['url'] = '?' . $oldLink['shorturl'];
-        }
-
-        if (empty($oldLink['title'])) {
-            $oldLink['title'] = $oldLink['url'];
-        }
+        $oldLink->setTitle($newLink->getTitle());
+        $oldLink->setUrl($newLink->getUrl());
+        $oldLink->setDescription($newLink->getDescription());
+        $oldLink->setTags($newLink->getTags());
+        $oldLink->setPrivate($newLink->isPrivate());
 
         return $oldLink;
     }
@@ -139,7 +136,7 @@ class ApiUtils
      * Format a Tag for the REST API.
      *
      * @param string $tag         Tag name
-     * @param int    $occurrences Number of links using this tag
+     * @param int    $occurrences Number of bookmarks using this tag
      *
      * @return array Link data formatted for the REST API.
      */
diff --git a/application/api/controllers/ApiController.php b/application/api/controllers/ApiController.php
index a6e7cbab..c4b3d0c3 100644
--- a/application/api/controllers/ApiController.php
+++ b/application/api/controllers/ApiController.php
@@ -2,7 +2,7 @@
 
 namespace Shaarli\Api\Controllers;
 
-use Shaarli\Bookmark\LinkDB;
+use Shaarli\Bookmark\BookmarkServiceInterface;
 use Shaarli\Config\ConfigManager;
 use Slim\Container;
 
@@ -26,9 +26,9 @@ abstract class ApiController
     protected $conf;
 
     /**
-     * @var LinkDB
+     * @var BookmarkServiceInterface
      */
-    protected $linkDb;
+    protected $bookmarkService;
 
     /**
      * @var HistoryController
@@ -51,7 +51,7 @@ abstract class ApiController
     {
         $this->ci = $ci;
         $this->conf = $ci->get('conf');
-        $this->linkDb = $ci->get('db');
+        $this->bookmarkService = $ci->get('db');
         $this->history = $ci->get('history');
         if ($this->conf->get('dev.debug', false)) {
             $this->jsonStyle = JSON_PRETTY_PRINT;
diff --git a/application/api/controllers/HistoryController.php b/application/api/controllers/HistoryController.php
index 9afcfa26..505647a9 100644
--- a/application/api/controllers/HistoryController.php
+++ b/application/api/controllers/HistoryController.php
@@ -41,7 +41,7 @@ class HistoryController extends ApiController
             throw new ApiBadParametersException('Invalid offset');
         }
 
-        // limit parameter is either a number of links or 'all' for everything.
+        // limit parameter is either a number of bookmarks or 'all' for everything.
         $limit = $request->getParam('limit');
         if (empty($limit)) {
             $limit = count($history);
diff --git a/application/api/controllers/Info.php b/application/api/controllers/Info.php
index f37dcae5..12f6b2f0 100644
--- a/application/api/controllers/Info.php
+++ b/application/api/controllers/Info.php
@@ -2,6 +2,7 @@
 
 namespace Shaarli\Api\Controllers;
 
+use Shaarli\Bookmark\BookmarkFilter;
 use Slim\Http\Request;
 use Slim\Http\Response;
 
@@ -26,8 +27,8 @@ class Info extends ApiController
     public function getInfo($request, $response)
     {
         $info = [
-            'global_counter' => count($this->linkDb),
-            'private_counter' => count_private($this->linkDb),
+            'global_counter' => $this->bookmarkService->count(),
+            'private_counter' => $this->bookmarkService->count(BookmarkFilter::$PRIVATE),
             'settings' => array(
                 'title' => $this->conf->get('general.title', 'Shaarli'),
                 'header_link' => $this->conf->get('general.header_link', '?'),
diff --git a/application/api/controllers/Links.php b/application/api/controllers/Links.php
index ffcfd4c7..29247950 100644
--- a/application/api/controllers/Links.php
+++ b/application/api/controllers/Links.php
@@ -11,7 +11,7 @@ use Slim\Http\Response;
 /**
  * Class Links
  *
- * REST API Controller: all services related to links collection.
+ * REST API Controller: all services related to bookmarks collection.
  *
  * @package Api\Controllers
  * @see http://shaarli.github.io/api-documentation/#links-links-collection
@@ -19,12 +19,12 @@ use Slim\Http\Response;
 class Links extends ApiController
 {
     /**
-     * @var int Number of links returned if no limit is provided.
+     * @var int Number of bookmarks returned if no limit is provided.
      */
     public static $DEFAULT_LIMIT = 20;
 
     /**
-     * Retrieve a list of links, allowing different filters.
+     * Retrieve a list of bookmarks, allowing different filters.
      *
      * @param Request  $request  Slim request.
      * @param Response $response Slim response.
@@ -36,33 +36,32 @@ class Links extends ApiController
     public function getLinks($request, $response)
     {
         $private = $request->getParam('visibility');
-        $links = $this->linkDb->filterSearch(
+        $bookmarks = $this->bookmarkService->search(
             [
                 'searchtags' => $request->getParam('searchtags', ''),
                 'searchterm' => $request->getParam('searchterm', ''),
             ],
-            false,
             $private
         );
 
-        // Return links from the {offset}th link, starting from 0.
+        // Return bookmarks from the {offset}th link, starting from 0.
         $offset = $request->getParam('offset');
         if (! empty($offset) && ! ctype_digit($offset)) {
             throw new ApiBadParametersException('Invalid offset');
         }
         $offset = ! empty($offset) ? intval($offset) : 0;
-        if ($offset > count($links)) {
+        if ($offset > count($bookmarks)) {
             return $response->withJson([], 200, $this->jsonStyle);
         }
 
-        // limit parameter is either a number of links or 'all' for everything.
+        // limit parameter is either a number of bookmarks or 'all' for everything.
         $limit = $request->getParam('limit');
         if (empty($limit)) {
             $limit = self::$DEFAULT_LIMIT;
         } elseif (ctype_digit($limit)) {
             $limit = intval($limit);
         } elseif ($limit === 'all') {
-            $limit = count($links);
+            $limit = count($bookmarks);
         } else {
             throw new ApiBadParametersException('Invalid limit');
         }
@@ -72,12 +71,12 @@ class Links extends ApiController
 
         $out = [];
         $index = 0;
-        foreach ($links as $link) {
+        foreach ($bookmarks as $bookmark) {
             if (count($out) >= $limit) {
                 break;
             }
             if ($index++ >= $offset) {
-                $out[] = ApiUtils::formatLink($link, $indexUrl);
+                $out[] = ApiUtils::formatLink($bookmark, $indexUrl);
             }
         }
 
@@ -97,11 +96,11 @@ class Links extends ApiController
      */
     public function getLink($request, $response, $args)
     {
-        if (!isset($this->linkDb[$args['id']])) {
+        if (!$this->bookmarkService->exists($args['id'])) {
             throw new ApiLinkNotFoundException();
         }
         $index = index_url($this->ci['environment']);
-        $out = ApiUtils::formatLink($this->linkDb[$args['id']], $index);
+        $out = ApiUtils::formatLink($this->bookmarkService->get($args['id']), $index);
 
         return $response->withJson($out, 200, $this->jsonStyle);
     }
@@ -117,9 +116,11 @@ class Links extends ApiController
     public function postLink($request, $response)
     {
         $data = $request->getParsedBody();
-        $link = ApiUtils::buildLinkFromRequest($data, $this->conf->get('privacy.default_private_links'));
+        $bookmark = ApiUtils::buildLinkFromRequest($data, $this->conf->get('privacy.default_private_links'));
         // duplicate by URL, return 409 Conflict
-        if (! empty($link['url']) && ! empty($dup = $this->linkDb->getLinkFromUrl($link['url']))) {
+        if (! empty($bookmark->getUrl())
+            && ! empty($dup = $this->bookmarkService->findByUrl($bookmark->getUrl()))
+        ) {
             return $response->withJson(
                 ApiUtils::formatLink($dup, index_url($this->ci['environment'])),
                 409,
@@ -127,23 +128,9 @@ class Links extends ApiController
             );
         }
 
-        $link['id'] = $this->linkDb->getNextId();
-        $link['shorturl'] = link_small_hash($link['created'], $link['id']);
-
-        // note: general relative URL
-        if (empty($link['url'])) {
-            $link['url'] = '?' . $link['shorturl'];
-        }
-
-        if (empty($link['title'])) {
-            $link['title'] = $link['url'];
-        }
-
-        $this->linkDb[$link['id']] = $link;
-        $this->linkDb->save($this->conf->get('resource.page_cache'));
-        $this->history->addLink($link);
-        $out = ApiUtils::formatLink($link, index_url($this->ci['environment']));
-        $redirect = $this->ci->router->relativePathFor('getLink', ['id' => $link['id']]);
+        $this->bookmarkService->add($bookmark);
+        $out = ApiUtils::formatLink($bookmark, index_url($this->ci['environment']));
+        $redirect = $this->ci->router->relativePathFor('getLink', ['id' => $bookmark->getId()]);
         return $response->withAddedHeader('Location', $redirect)
                         ->withJson($out, 201, $this->jsonStyle);
     }
@@ -161,18 +148,18 @@ class Links extends ApiController
      */
     public function putLink($request, $response, $args)
     {
-        if (! isset($this->linkDb[$args['id']])) {
+        if (! $this->bookmarkService->exists($args['id'])) {
             throw new ApiLinkNotFoundException();
         }
 
         $index = index_url($this->ci['environment']);
         $data = $request->getParsedBody();
 
-        $requestLink = ApiUtils::buildLinkFromRequest($data, $this->conf->get('privacy.default_private_links'));
+        $requestBookmark = ApiUtils::buildLinkFromRequest($data, $this->conf->get('privacy.default_private_links'));
         // duplicate URL on a different link, return 409 Conflict
-        if (! empty($requestLink['url'])
-            && ! empty($dup = $this->linkDb->getLinkFromUrl($requestLink['url']))
-            && $dup['id'] != $args['id']
+        if (! empty($requestBookmark->getUrl())
+            && ! empty($dup = $this->bookmarkService->findByUrl($requestBookmark->getUrl()))
+            && $dup->getId() != $args['id']
         ) {
             return $response->withJson(
                 ApiUtils::formatLink($dup, $index),
@@ -181,13 +168,11 @@ class Links extends ApiController
             );
         }
 
-        $responseLink = $this->linkDb[$args['id']];
-        $responseLink = ApiUtils::updateLink($responseLink, $requestLink);
-        $this->linkDb[$responseLink['id']] = $responseLink;
-        $this->linkDb->save($this->conf->get('resource.page_cache'));
-        $this->history->updateLink($responseLink);
+        $responseBookmark = $this->bookmarkService->get($args['id']);
+        $responseBookmark = ApiUtils::updateLink($responseBookmark, $requestBookmark);
+        $this->bookmarkService->set($responseBookmark);
 
-        $out = ApiUtils::formatLink($responseLink, $index);
+        $out = ApiUtils::formatLink($responseBookmark, $index);
         return $response->withJson($out, 200, $this->jsonStyle);
     }
 
@@ -204,13 +189,11 @@ class Links extends ApiController
      */
     public function deleteLink($request, $response, $args)
     {
-        if (! isset($this->linkDb[$args['id']])) {
+        if (! $this->bookmarkService->exists($args['id'])) {
             throw new ApiLinkNotFoundException();
         }
-        $link = $this->linkDb[$args['id']];
-        unset($this->linkDb[(int) $args['id']]);
-        $this->linkDb->save($this->conf->get('resource.page_cache'));
-        $this->history->deleteLink($link);
+        $bookmark = $this->bookmarkService->get($args['id']);
+        $this->bookmarkService->remove($bookmark);
 
         return $response->withStatus(204);
     }
diff --git a/application/api/controllers/Tags.php b/application/api/controllers/Tags.php
index 82f3ef74..e60e00a7 100644
--- a/application/api/controllers/Tags.php
+++ b/application/api/controllers/Tags.php
@@ -5,6 +5,7 @@ namespace Shaarli\Api\Controllers;
 use Shaarli\Api\ApiUtils;
 use Shaarli\Api\Exceptions\ApiBadParametersException;
 use Shaarli\Api\Exceptions\ApiTagNotFoundException;
+use Shaarli\Bookmark\BookmarkFilter;
 use Slim\Http\Request;
 use Slim\Http\Response;
 
@@ -18,7 +19,7 @@ use Slim\Http\Response;
 class Tags extends ApiController
 {
     /**
-     * @var int Number of links returned if no limit is provided.
+     * @var int Number of bookmarks returned if no limit is provided.
      */
     public static $DEFAULT_LIMIT = 'all';
 
@@ -35,7 +36,7 @@ class Tags extends ApiController
     public function getTags($request, $response)
     {
         $visibility = $request->getParam('visibility');
-        $tags = $this->linkDb->linksCountPerTag([], $visibility);
+        $tags = $this->bookmarkService->bookmarksCountPerTag([], $visibility);
 
         // Return tags from the {offset}th tag, starting from 0.
         $offset = $request->getParam('offset');
@@ -47,7 +48,7 @@ class Tags extends ApiController
             return $response->withJson([], 200, $this->jsonStyle);
         }
 
-        // limit parameter is either a number of links or 'all' for everything.
+        // limit parameter is either a number of bookmarks or 'all' for everything.
         $limit = $request->getParam('limit');
         if (empty($limit)) {
             $limit = self::$DEFAULT_LIMIT;
@@ -87,7 +88,7 @@ class Tags extends ApiController
      */
     public function getTag($request, $response, $args)
     {
-        $tags = $this->linkDb->linksCountPerTag();
+        $tags = $this->bookmarkService->bookmarksCountPerTag();
         if (!isset($tags[$args['tagName']])) {
             throw new ApiTagNotFoundException();
         }
@@ -111,7 +112,7 @@ class Tags extends ApiController
      */
     public function putTag($request, $response, $args)
     {
-        $tags = $this->linkDb->linksCountPerTag();
+        $tags = $this->bookmarkService->bookmarksCountPerTag();
         if (! isset($tags[$args['tagName']])) {
             throw new ApiTagNotFoundException();
         }
@@ -121,13 +122,19 @@ class Tags extends ApiController
             throw new ApiBadParametersException('New tag name is required in the request body');
         }
 
-        $updated = $this->linkDb->renameTag($args['tagName'], $data['name']);
-        $this->linkDb->save($this->conf->get('resource.page_cache'));
-        foreach ($updated as $link) {
-            $this->history->updateLink($link);
+        $bookmarks = $this->bookmarkService->search(
+            ['searchtags' => $args['tagName']],
+            BookmarkFilter::$ALL,
+            true
+        );
+        foreach ($bookmarks as $bookmark) {
+            $bookmark->renameTag($args['tagName'], $data['name']);
+            $this->bookmarkService->set($bookmark, false);
+            $this->history->updateLink($bookmark);
         }
+        $this->bookmarkService->save();
 
-        $tags = $this->linkDb->linksCountPerTag();
+        $tags = $this->bookmarkService->bookmarksCountPerTag();
         $out = ApiUtils::formatTag($data['name'], $tags[$data['name']]);
         return $response->withJson($out, 200, $this->jsonStyle);
     }
@@ -145,15 +152,22 @@ class Tags extends ApiController
      */
     public function deleteTag($request, $response, $args)
     {
-        $tags = $this->linkDb->linksCountPerTag();
+        $tags = $this->bookmarkService->bookmarksCountPerTag();
         if (! isset($tags[$args['tagName']])) {
             throw new ApiTagNotFoundException();
         }
-        $updated = $this->linkDb->renameTag($args['tagName'], null);
-        $this->linkDb->save($this->conf->get('resource.page_cache'));
-        foreach ($updated as $link) {
-            $this->history->updateLink($link);
+
+        $bookmarks = $this->bookmarkService->search(
+            ['searchtags' => $args['tagName']],
+            BookmarkFilter::$ALL,
+            true
+        );
+        foreach ($bookmarks as $bookmark) {
+            $bookmark->deleteTag($args['tagName']);
+            $this->bookmarkService->set($bookmark, false);
+            $this->history->updateLink($bookmark);
         }
+        $this->bookmarkService->save();
 
         return $response->withStatus(204);
     }
diff --git a/application/bookmark/Bookmark.php b/application/bookmark/Bookmark.php
new file mode 100644
index 00000000..1beb8be2
--- /dev/null
+++ b/application/bookmark/Bookmark.php
@@ -0,0 +1,462 @@
+<?php
+
+namespace Shaarli\Bookmark;
+
+use DateTime;
+use DateTimeInterface;
+use Shaarli\Bookmark\Exception\InvalidBookmarkException;
+
+/**
+ * Class Bookmark
+ *
+ * This class represent a single Bookmark with all its attributes.
+ * Every bookmark should manipulated using this, before being formatted.
+ *
+ * @package Shaarli\Bookmark
+ */
+class Bookmark
+{
+    /** @var string Date format used in string (former ID format) */
+    const LINK_DATE_FORMAT = 'Ymd_His';
+
+    /** @var int Bookmark ID */
+    protected $id;
+
+    /** @var string Permalink identifier */
+    protected $shortUrl;
+
+    /** @var string Bookmark's URL - $shortUrl prefixed with `?` for notes */
+    protected $url;
+
+    /** @var string Bookmark's title */
+    protected $title;
+
+    /** @var string Raw bookmark's description */
+    protected $description;
+
+    /** @var array List of bookmark's tags */
+    protected $tags;
+
+    /** @var string|bool|null Thumbnail's URL - initialized at null, false if no thumbnail could be found */
+    protected $thumbnail;
+
+    /** @var bool Set to true if the bookmark is set as sticky */
+    protected $sticky;
+
+    /** @var DateTimeInterface Creation datetime */
+    protected $created;
+
+    /** @var DateTimeInterface datetime */
+    protected $updated;
+
+    /** @var bool True if the bookmark can only be seen while logged in */
+    protected $private;
+
+    /**
+     * Initialize a link from array data. Especially useful to create a Bookmark from former link storage format.
+     *
+     * @param array $data
+     *
+     * @return $this
+     */
+    public function fromArray($data)
+    {
+        $this->id = $data['id'];
+        $this->shortUrl = $data['shorturl'];
+        $this->url = $data['url'];
+        $this->title = $data['title'];
+        $this->description = $data['description'];
+        $this->thumbnail = isset($data['thumbnail']) ? $data['thumbnail'] : null;
+        $this->sticky = isset($data['sticky']) ? $data['sticky'] : false;
+        $this->created = $data['created'];
+        if (is_array($data['tags'])) {
+            $this->tags = $data['tags'];
+        } else {
+            $this->tags = preg_split('/\s+/', $data['tags'], -1, PREG_SPLIT_NO_EMPTY);
+        }
+        if (! empty($data['updated'])) {
+            $this->updated = $data['updated'];
+        }
+        $this->private = $data['private'] ? true : false;
+
+        return $this;
+    }
+
+    /**
+     * Make sure that the current instance of Bookmark is valid and can be saved into the data store.
+     * A valid link requires:
+     *   - an integer ID
+     *   - a short URL (for permalinks)
+     *   - a creation date
+     *
+     * This function also initialize optional empty fields:
+     *   - the URL with the permalink
+     *   - the title with the URL
+     *
+     * @throws InvalidBookmarkException
+     */
+    public function validate()
+    {
+        if ($this->id === null
+            || ! is_int($this->id)
+            || empty($this->shortUrl)
+            || empty($this->created)
+            || ! $this->created instanceof DateTimeInterface
+        ) {
+            throw new InvalidBookmarkException($this);
+        }
+        if (empty($this->url)) {
+            $this->url = '/shaare/'. $this->shortUrl;
+        }
+        if (empty($this->title)) {
+            $this->title = $this->url;
+        }
+    }
+
+    /**
+     * Set the Id.
+     * If they're not already initialized, this function also set:
+     *   - created: with the current datetime
+     *   - shortUrl: with a generated small hash from the date and the given ID
+     *
+     * @param int $id
+     *
+     * @return Bookmark
+     */
+    public function setId($id)
+    {
+        $this->id = $id;
+        if (empty($this->created)) {
+            $this->created = new DateTime();
+        }
+        if (empty($this->shortUrl)) {
+            $this->shortUrl = link_small_hash($this->created, $this->id);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get the Id.
+     *
+     * @return int
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * Get the ShortUrl.
+     *
+     * @return string
+     */
+    public function getShortUrl()
+    {
+        return $this->shortUrl;
+    }
+
+    /**
+     * Get the Url.
+     *
+     * @return string
+     */
+    public function getUrl()
+    {
+        return $this->url;
+    }
+
+    /**
+     * Get the Title.
+     *
+     * @return string
+     */
+    public function getTitle()
+    {
+        return $this->title;
+    }
+
+    /**
+     * Get the Description.
+     *
+     * @return string
+     */
+    public function getDescription()
+    {
+        return ! empty($this->description) ? $this->description : '';
+    }
+
+    /**
+     * Get the Created.
+     *
+     * @return DateTimeInterface
+     */
+    public function getCreated()
+    {
+        return $this->created;
+    }
+
+    /**
+     * Get the Updated.
+     *
+     * @return DateTimeInterface
+     */
+    public function getUpdated()
+    {
+        return $this->updated;
+    }
+
+    /**
+     * Set the ShortUrl.
+     *
+     * @param string $shortUrl
+     *
+     * @return Bookmark
+     */
+    public function setShortUrl($shortUrl)
+    {
+        $this->shortUrl = $shortUrl;
+
+        return $this;
+    }
+
+    /**
+     * Set the Url.
+     *
+     * @param string $url
+     * @param array  $allowedProtocols
+     *
+     * @return Bookmark
+     */
+    public function setUrl($url, $allowedProtocols = [])
+    {
+        $url = trim($url);
+        if (! empty($url)) {
+            $url = whitelist_protocols($url, $allowedProtocols);
+        }
+        $this->url = $url;
+
+        return $this;
+    }
+
+    /**
+     * Set the Title.
+     *
+     * @param string $title
+     *
+     * @return Bookmark
+     */
+    public function setTitle($title)
+    {
+        $this->title = trim($title);
+
+        return $this;
+    }
+
+    /**
+     * Set the Description.
+     *
+     * @param string $description
+     *
+     * @return Bookmark
+     */
+    public function setDescription($description)
+    {
+        $this->description = $description;
+
+        return $this;
+    }
+
+    /**
+     * Set the Created.
+     * Note: you shouldn't set this manually except for special cases (like bookmark import)
+     *
+     * @param DateTimeInterface $created
+     *
+     * @return Bookmark
+     */
+    public function setCreated($created)
+    {
+        $this->created = $created;
+
+        return $this;
+    }
+
+    /**
+     * Set the Updated.
+     *
+     * @param DateTimeInterface $updated
+     *
+     * @return Bookmark
+     */
+    public function setUpdated($updated)
+    {
+        $this->updated = $updated;
+
+        return $this;
+    }
+
+    /**
+     * Get the Private.
+     *
+     * @return bool
+     */
+    public function isPrivate()
+    {
+        return $this->private ? true : false;
+    }
+
+    /**
+     * Set the Private.
+     *
+     * @param bool $private
+     *
+     * @return Bookmark
+     */
+    public function setPrivate($private)
+    {
+        $this->private = $private ? true : false;
+
+        return $this;
+    }
+
+    /**
+     * Get the Tags.
+     *
+     * @return array
+     */
+    public function getTags()
+    {
+        return is_array($this->tags) ? $this->tags : [];
+    }
+
+    /**
+     * Set the Tags.
+     *
+     * @param array $tags
+     *
+     * @return Bookmark
+     */
+    public function setTags($tags)
+    {
+        $this->setTagsString(implode(' ', $tags));
+
+        return $this;
+    }
+
+    /**
+     * Get the Thumbnail.
+     *
+     * @return string|bool|null Thumbnail's URL - initialized at null, false if no thumbnail could be found
+     */
+    public function getThumbnail()
+    {
+        return !$this->isNote() ? $this->thumbnail : false;
+    }
+
+    /**
+     * Set the Thumbnail.
+     *
+     * @param string|bool $thumbnail Thumbnail's URL - false if no thumbnail could be found
+     *
+     * @return Bookmark
+     */
+    public function setThumbnail($thumbnail)
+    {
+        $this->thumbnail = $thumbnail;
+
+        return $this;
+    }
+
+    /**
+     * Get the Sticky.
+     *
+     * @return bool
+     */
+    public function isSticky()
+    {
+        return $this->sticky ? true : false;
+    }
+
+    /**
+     * Set the Sticky.
+     *
+     * @param bool $sticky
+     *
+     * @return Bookmark
+     */
+    public function setSticky($sticky)
+    {
+        $this->sticky = $sticky ? true : false;
+
+        return $this;
+    }
+
+    /**
+     * @return string Bookmark's tags as a string, separated by a space
+     */
+    public function getTagsString()
+    {
+        return implode(' ', $this->getTags());
+    }
+
+    /**
+     * @return bool
+     */
+    public function isNote()
+    {
+        // We check empty value to get a valid result if the link has not been saved yet
+        return empty($this->url) || startsWith($this->url, '/shaare/') || $this->url[0] === '?';
+    }
+
+    /**
+     * Set tags from a string.
+     * Note:
+     *   - tags must be separated whether by a space or a comma
+     *   - multiple spaces will be removed
+     *   - trailing dash in tags will be removed
+     *
+     * @param string $tags
+     *
+     * @return $this
+     */
+    public function setTagsString($tags)
+    {
+        // Remove first '-' char in tags.
+        $tags = preg_replace('/(^| )\-/', '$1', $tags);
+        // Explode all tags separted by spaces or commas
+        $tags = preg_split('/[\s,]+/', $tags);
+        // Remove eventual empty values
+        $tags = array_values(array_filter($tags));
+
+        $this->tags = $tags;
+
+        return $this;
+    }
+
+    /**
+     * Rename a tag in tags list.
+     *
+     * @param string $fromTag
+     * @param string $toTag
+     */
+    public function renameTag($fromTag, $toTag)
+    {
+        if (($pos = array_search($fromTag, $this->tags)) !== false) {
+            $this->tags[$pos] = trim($toTag);
+        }
+    }
+
+    /**
+     * Delete a tag from tags list.
+     *
+     * @param string $tag
+     */
+    public function deleteTag($tag)
+    {
+        if (($pos = array_search($tag, $this->tags)) !== false) {
+            unset($this->tags[$pos]);
+            $this->tags = array_values($this->tags);
+        }
+    }
+}
diff --git a/application/bookmark/BookmarkArray.php b/application/bookmark/BookmarkArray.php
new file mode 100644
index 00000000..3bd5eb20
--- /dev/null
+++ b/application/bookmark/BookmarkArray.php
@@ -0,0 +1,260 @@
+<?php
+
+namespace Shaarli\Bookmark;
+
+use Shaarli\Bookmark\Exception\InvalidBookmarkException;
+
+/**
+ * Class BookmarkArray
+ *
+ * Implementing ArrayAccess, this allows us to use the bookmark list
+ * as an array and iterate over it.
+ *
+ * @package Shaarli\Bookmark
+ */
+class BookmarkArray implements \Iterator, \Countable, \ArrayAccess
+{
+    /**
+     * @var Bookmark[]
+     */
+    protected $bookmarks;
+
+    /**
+     * @var array List of all bookmarks IDS mapped with their array offset.
+     *            Map: id->offset.
+     */
+    protected $ids;
+
+    /**
+     * @var int Position in the $this->keys array (for the Iterator interface)
+     */
+    protected $position;
+
+    /**
+     * @var array List of offset keys (for the Iterator interface implementation)
+     */
+    protected $keys;
+
+    /**
+     * @var array List of all recorded URLs (key=url, value=bookmark offset)
+     *            for fast reserve search (url-->bookmark offset)
+     */
+    protected $urls;
+
+    public function __construct()
+    {
+        $this->ids = [];
+        $this->bookmarks = [];
+        $this->keys = [];
+        $this->urls = [];
+        $this->position = 0;
+    }
+
+    /**
+     * Countable - Counts elements of an object
+     *
+     * @return int Number of bookmarks
+     */
+    public function count()
+    {
+        return count($this->bookmarks);
+    }
+
+    /**
+     * ArrayAccess - Assigns a value to the specified offset
+     *
+     * @param int      $offset Bookmark ID
+     * @param Bookmark $value  instance
+     *
+     * @throws InvalidBookmarkException
+     */
+    public function offsetSet($offset, $value)
+    {
+        if (! $value instanceof Bookmark
+            || $value->getId() === null || empty($value->getUrl())
+            || ($offset !== null && ! is_int($offset)) || ! is_int($value->getId())
+            || $offset !== null && $offset !== $value->getId()
+        ) {
+            throw new InvalidBookmarkException($value);
+        }
+
+        // If the bookmark exists, we reuse the real offset, otherwise new entry
+        if ($offset !== null) {
+            $existing = $this->getBookmarkOffset($offset);
+        } else {
+            $existing = $this->getBookmarkOffset($value->getId());
+        }
+
+        if ($existing !== null) {
+            $offset = $existing;
+        } else {
+            $offset = count($this->bookmarks);
+        }
+
+        $this->bookmarks[$offset] = $value;
+        $this->urls[$value->getUrl()] = $offset;
+        $this->ids[$value->getId()] = $offset;
+    }
+
+    /**
+     * ArrayAccess - Whether or not an offset exists
+     *
+     * @param int $offset Bookmark ID
+     *
+     * @return bool true if it exists, false otherwise
+     */
+    public function offsetExists($offset)
+    {
+        return array_key_exists($this->getBookmarkOffset($offset), $this->bookmarks);
+    }
+
+    /**
+     * ArrayAccess - Unsets an offset
+     *
+     * @param int $offset Bookmark ID
+     */
+    public function offsetUnset($offset)
+    {
+        $realOffset = $this->getBookmarkOffset($offset);
+        $url = $this->bookmarks[$realOffset]->getUrl();
+        unset($this->urls[$url]);
+        unset($this->ids[$offset]);
+        unset($this->bookmarks[$realOffset]);
+    }
+
+    /**
+     * ArrayAccess - Returns the value at specified offset
+     *
+     * @param int $offset Bookmark ID
+     *
+     * @return Bookmark|null The Bookmark if found, null otherwise
+     */
+    public function offsetGet($offset)
+    {
+        $realOffset = $this->getBookmarkOffset($offset);
+        return isset($this->bookmarks[$realOffset]) ? $this->bookmarks[$realOffset] : null;
+    }
+
+    /**
+     * Iterator - Returns the current element
+     *
+     * @return Bookmark corresponding to the current position
+     */
+    public function current()
+    {
+        return $this[$this->keys[$this->position]];
+    }
+
+    /**
+     * Iterator - Returns the key of the current element
+     *
+     * @return int Bookmark ID corresponding to the current position
+     */
+    public function key()
+    {
+        return $this->keys[$this->position];
+    }
+
+    /**
+     * Iterator - Moves forward to next element
+     */
+    public function next()
+    {
+        ++$this->position;
+    }
+
+    /**
+     * Iterator - Rewinds the Iterator to the first element
+     *
+     * Entries are sorted by date (latest first)
+     */
+    public function rewind()
+    {
+        $this->keys = array_keys($this->ids);
+        $this->position = 0;
+    }
+
+    /**
+     * Iterator - Checks if current position is valid
+     *
+     * @return bool true if the current Bookmark ID exists, false otherwise
+     */
+    public function valid()
+    {
+        return isset($this->keys[$this->position]);
+    }
+
+    /**
+     * Returns a bookmark offset in bookmarks array from its unique ID.
+     *
+     * @param int $id Persistent ID of a bookmark.
+     *
+     * @return int Real offset in local array, or null if doesn't exist.
+     */
+    protected function getBookmarkOffset($id)
+    {
+        if (isset($this->ids[$id])) {
+            return $this->ids[$id];
+        }
+        return null;
+    }
+
+    /**
+     * Return the next key for bookmark creation.
+     * E.g. If the last ID is 597, the next will be 598.
+     *
+     * @return int next ID.
+     */
+    public function getNextId()
+    {
+        if (!empty($this->ids)) {
+            return max(array_keys($this->ids)) + 1;
+        }
+        return 0;
+    }
+
+    /**
+     * @param $url
+     *
+     * @return Bookmark|null
+     */
+    public function getByUrl($url)
+    {
+        if (! empty($url)
+            && isset($this->urls[$url])
+            && isset($this->bookmarks[$this->urls[$url]])
+        ) {
+            return $this->bookmarks[$this->urls[$url]];
+        }
+        return null;
+    }
+
+    /**
+     * Reorder links by creation date (newest first).
+     *
+     * Also update the urls and ids mapping arrays.
+     *
+     * @param string $order        ASC|DESC
+     * @param bool   $ignoreSticky If set to true, sticky bookmarks won't be first
+     */
+    public function reorder(string $order = 'DESC', bool $ignoreSticky = false): void
+    {
+        $order = $order === 'ASC' ? -1 : 1;
+        // Reorder array by dates.
+        usort($this->bookmarks, function ($a, $b) use ($order, $ignoreSticky) {
+            /** @var $a Bookmark */
+            /** @var $b Bookmark */
+            if (false === $ignoreSticky && $a->isSticky() !== $b->isSticky()) {
+                return $a->isSticky() ? -1 : 1;
+            }
+            return $a->getCreated() < $b->getCreated() ? 1 * $order : -1 * $order;
+        });
+
+        $this->urls = [];
+        $this->ids = [];
+        foreach ($this->bookmarks as $key => $bookmark) {
+            $this->urls[$bookmark->getUrl()] = $key;
+            $this->ids[$bookmark->getId()] = $key;
+        }
+    }
+}
diff --git a/application/bookmark/BookmarkFileService.php b/application/bookmark/BookmarkFileService.php
new file mode 100644
index 00000000..c9ec2609
--- /dev/null
+++ b/application/bookmark/BookmarkFileService.php
@@ -0,0 +1,407 @@
+<?php
+
+
+namespace Shaarli\Bookmark;
+
+
+use Exception;
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
+use Shaarli\Bookmark\Exception\DatastoreNotInitializedException;
+use Shaarli\Bookmark\Exception\EmptyDataStoreException;
+use Shaarli\Config\ConfigManager;
+use Shaarli\Formatter\BookmarkMarkdownFormatter;
+use Shaarli\History;
+use Shaarli\Legacy\LegacyLinkDB;
+use Shaarli\Legacy\LegacyUpdater;
+use Shaarli\Render\PageCacheManager;
+use Shaarli\Updater\UpdaterUtils;
+
+/**
+ * Class BookmarksService
+ *
+ * This is the entry point to manipulate the bookmark DB.
+ * It manipulates loads links from a file data store containing all bookmarks.
+ *
+ * It also triggers the legacy format (bookmarks as arrays) migration.
+ */
+class BookmarkFileService implements BookmarkServiceInterface
+{
+    /** @var Bookmark[] instance */
+    protected $bookmarks;
+
+    /** @var BookmarkIO instance */
+    protected $bookmarksIO;
+
+    /** @var BookmarkFilter */
+    protected $bookmarkFilter;
+
+    /** @var ConfigManager instance */
+    protected $conf;
+
+    /** @var History instance */
+    protected $history;
+
+    /** @var PageCacheManager instance */
+    protected $pageCacheManager;
+
+    /** @var bool true for logged in users. Default value to retrieve private bookmarks. */
+    protected $isLoggedIn;
+
+    /**
+     * @inheritDoc
+     */
+    public function __construct(ConfigManager $conf, History $history, $isLoggedIn)
+    {
+        $this->conf = $conf;
+        $this->history = $history;
+        $this->pageCacheManager = new PageCacheManager($this->conf->get('resource.page_cache'), $isLoggedIn);
+        $this->bookmarksIO = new BookmarkIO($this->conf);
+        $this->isLoggedIn = $isLoggedIn;
+
+        if (!$this->isLoggedIn && $this->conf->get('privacy.hide_public_links', false)) {
+            $this->bookmarks = [];
+        } else {
+            try {
+                $this->bookmarks = $this->bookmarksIO->read();
+            } catch (EmptyDataStoreException|DatastoreNotInitializedException $e) {
+                $this->bookmarks = new BookmarkArray();
+
+                if ($this->isLoggedIn) {
+                    // Datastore file does not exists, we initialize it with default bookmarks.
+                    if ($e instanceof DatastoreNotInitializedException) {
+                        $this->initialize();
+                    } else {
+                        $this->save();
+                    }
+                }
+            }
+
+            if (! $this->bookmarks instanceof BookmarkArray) {
+                $this->migrate();
+                exit(
+                    'Your data store has been migrated, please reload the page.'. PHP_EOL .
+                    'If this message keeps showing up, please delete data/updates.txt file.'
+                );
+            }
+        }
+
+        $this->bookmarkFilter = new BookmarkFilter($this->bookmarks);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function findByHash($hash)
+    {
+        $bookmark = $this->bookmarkFilter->filter(BookmarkFilter::$FILTER_HASH, $hash);
+        // PHP 7.3 introduced array_key_first() to avoid this hack
+        $first = reset($bookmark);
+        if (! $this->isLoggedIn && $first->isPrivate()) {
+            throw new Exception('Not authorized');
+        }
+
+        return $first;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function findByUrl($url)
+    {
+        return $this->bookmarks->getByUrl($url);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function search(
+        $request = [],
+        $visibility = null,
+        $caseSensitive = false,
+        $untaggedOnly = false,
+        bool $ignoreSticky = false
+    ) {
+        if ($visibility === null) {
+            $visibility = $this->isLoggedIn ? BookmarkFilter::$ALL : BookmarkFilter::$PUBLIC;
+        }
+
+        // Filter bookmark database according to parameters.
+        $searchtags = isset($request['searchtags']) ? $request['searchtags'] : '';
+        $searchterm = isset($request['searchterm']) ? $request['searchterm'] : '';
+
+        if ($ignoreSticky) {
+            $this->bookmarks->reorder('DESC', true);
+        }
+
+        return $this->bookmarkFilter->filter(
+            BookmarkFilter::$FILTER_TAG | BookmarkFilter::$FILTER_TEXT,
+            [$searchtags, $searchterm],
+            $caseSensitive,
+            $visibility,
+            $untaggedOnly
+        );
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function get($id, $visibility = null)
+    {
+        if (! isset($this->bookmarks[$id])) {
+            throw new BookmarkNotFoundException();
+        }
+
+        if ($visibility === null) {
+            $visibility = $this->isLoggedIn ? BookmarkFilter::$ALL : BookmarkFilter::$PUBLIC;
+        }
+
+        $bookmark = $this->bookmarks[$id];
+        if (($bookmark->isPrivate() && $visibility != 'all' && $visibility != 'private')
+            || (! $bookmark->isPrivate() && $visibility != 'all' && $visibility != 'public')
+        ) {
+            throw new Exception('Unauthorized');
+        }
+
+        return $bookmark;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function set($bookmark, $save = true)
+    {
+        if (true !== $this->isLoggedIn) {
+            throw new Exception(t('You\'re not authorized to alter the datastore'));
+        }
+        if (! $bookmark instanceof Bookmark) {
+            throw new Exception(t('Provided data is invalid'));
+        }
+        if (! isset($this->bookmarks[$bookmark->getId()])) {
+            throw new BookmarkNotFoundException();
+        }
+        $bookmark->validate();
+
+        $bookmark->setUpdated(new \DateTime());
+        $this->bookmarks[$bookmark->getId()] = $bookmark;
+        if ($save === true) {
+            $this->save();
+            $this->history->updateLink($bookmark);
+        }
+        return $this->bookmarks[$bookmark->getId()];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function add($bookmark, $save = true)
+    {
+        if (true !== $this->isLoggedIn) {
+            throw new Exception(t('You\'re not authorized to alter the datastore'));
+        }
+        if (! $bookmark instanceof Bookmark) {
+            throw new Exception(t('Provided data is invalid'));
+        }
+        if (! empty($bookmark->getId())) {
+            throw new Exception(t('This bookmarks already exists'));
+        }
+        $bookmark->setId($this->bookmarks->getNextId());
+        $bookmark->validate();
+
+        $this->bookmarks[$bookmark->getId()] = $bookmark;
+        if ($save === true) {
+            $this->save();
+            $this->history->addLink($bookmark);
+        }
+        return $this->bookmarks[$bookmark->getId()];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function addOrSet($bookmark, $save = true)
+    {
+        if (true !== $this->isLoggedIn) {
+            throw new Exception(t('You\'re not authorized to alter the datastore'));
+        }
+        if (! $bookmark instanceof Bookmark) {
+            throw new Exception('Provided data is invalid');
+        }
+        if ($bookmark->getId() === null) {
+            return $this->add($bookmark, $save);
+        }
+        return $this->set($bookmark, $save);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function remove($bookmark, $save = true)
+    {
+        if (true !== $this->isLoggedIn) {
+            throw new Exception(t('You\'re not authorized to alter the datastore'));
+        }
+        if (! $bookmark instanceof Bookmark) {
+            throw new Exception(t('Provided data is invalid'));
+        }
+        if (! isset($this->bookmarks[$bookmark->getId()])) {
+            throw new BookmarkNotFoundException();
+        }
+
+        unset($this->bookmarks[$bookmark->getId()]);
+        if ($save === true) {
+            $this->save();
+            $this->history->deleteLink($bookmark);
+        }
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function exists($id, $visibility = null)
+    {
+        if (! isset($this->bookmarks[$id])) {
+            return false;
+        }
+
+        if ($visibility === null) {
+            $visibility = $this->isLoggedIn ? 'all' : 'public';
+        }
+
+        $bookmark = $this->bookmarks[$id];
+        if (($bookmark->isPrivate() && $visibility != 'all' && $visibility != 'private')
+            || (! $bookmark->isPrivate() && $visibility != 'all' && $visibility != 'public')
+        ) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function count($visibility = null)
+    {
+        return count($this->search([], $visibility));
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function save()
+    {
+        if (true !== $this->isLoggedIn) {
+            // TODO: raise an Exception instead
+            die('You are not authorized to change the database.');
+        }
+
+        $this->bookmarks->reorder();
+        $this->bookmarksIO->write($this->bookmarks);
+        $this->pageCacheManager->invalidateCaches();
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function bookmarksCountPerTag($filteringTags = [], $visibility = null)
+    {
+        $bookmarks = $this->search(['searchtags' => $filteringTags], $visibility);
+        $tags = [];
+        $caseMapping = [];
+        foreach ($bookmarks as $bookmark) {
+            foreach ($bookmark->getTags() as $tag) {
+                if (empty($tag)
+                    || (! $this->isLoggedIn && startsWith($tag, '.'))
+                    || $tag === BookmarkMarkdownFormatter::NO_MD_TAG
+                    || in_array($tag, $filteringTags, true)
+                ) {
+                    continue;
+                }
+
+                // The first case found will be displayed.
+                if (!isset($caseMapping[strtolower($tag)])) {
+                    $caseMapping[strtolower($tag)] = $tag;
+                    $tags[$caseMapping[strtolower($tag)]] = 0;
+                }
+                $tags[$caseMapping[strtolower($tag)]]++;
+            }
+        }
+
+        /*
+         * Formerly used arsort(), which doesn't define the sort behaviour for equal values.
+         * Also, this function doesn't produce the same result between PHP 5.6 and 7.
+         *
+         * So we now use array_multisort() to sort tags by DESC occurrences,
+         * then ASC alphabetically for equal values.
+         *
+         * @see https://github.com/shaarli/Shaarli/issues/1142
+         */
+        $keys = array_keys($tags);
+        $tmpTags = array_combine($keys, $keys);
+        array_multisort($tags, SORT_DESC, $tmpTags, SORT_ASC, $tags);
+        return $tags;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function days()
+    {
+        $bookmarkDays = [];
+        foreach ($this->search() as $bookmark) {
+            $bookmarkDays[$bookmark->getCreated()->format('Ymd')] = 0;
+        }
+        $bookmarkDays = array_keys($bookmarkDays);
+        sort($bookmarkDays);
+
+        return $bookmarkDays;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function filterDay($request)
+    {
+        $visibility = $this->isLoggedIn ? BookmarkFilter::$ALL : BookmarkFilter::$PUBLIC;
+
+        return $this->bookmarkFilter->filter(BookmarkFilter::$FILTER_DAY, $request, false, $visibility);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function initialize()
+    {
+        $initializer = new BookmarkInitializer($this);
+        $initializer->initialize();
+
+        if (true === $this->isLoggedIn) {
+            $this->save();
+        }
+    }
+
+    /**
+     * Handles migration to the new database format (BookmarksArray).
+     */
+    protected function migrate()
+    {
+        $bookmarkDb = new LegacyLinkDB(
+            $this->conf->get('resource.datastore'),
+            true,
+            false
+        );
+        $updater = new LegacyUpdater(
+            UpdaterUtils::read_updates_file($this->conf->get('resource.updates')),
+            $bookmarkDb,
+            $this->conf,
+            true
+        );
+        $newUpdates = $updater->update();
+        if (! empty($newUpdates)) {
+            UpdaterUtils::write_updates_file(
+                $this->conf->get('resource.updates'),
+                $updater->getDoneUpdates()
+            );
+        }
+    }
+}
diff --git a/application/bookmark/BookmarkFilter.php b/application/bookmark/BookmarkFilter.php
new file mode 100644
index 00000000..6636bbfe
--- /dev/null
+++ b/application/bookmark/BookmarkFilter.php
@@ -0,0 +1,473 @@
+<?php
+
+namespace Shaarli\Bookmark;
+
+use Exception;
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
+
+/**
+ * Class LinkFilter.
+ *
+ * Perform search and filter operation on link data list.
+ */
+class BookmarkFilter
+{
+    /**
+     * @var string permalinks.
+     */
+    public static $FILTER_HASH = 'permalink';
+
+    /**
+     * @var string text search.
+     */
+    public static $FILTER_TEXT = 'fulltext';
+
+    /**
+     * @var string tag filter.
+     */
+    public static $FILTER_TAG = 'tags';
+
+    /**
+     * @var string filter by day.
+     */
+    public static $FILTER_DAY = 'FILTER_DAY';
+
+    /**
+     * @var string filter by day.
+     */
+    public static $DEFAULT = 'NO_FILTER';
+
+    /** @var string Visibility: all */
+    public static $ALL = 'all';
+
+    /** @var string Visibility: public */
+    public static $PUBLIC = 'public';
+
+    /** @var string Visibility: private */
+    public static $PRIVATE = 'private';
+
+    /**
+     * @var string Allowed characters for hashtags (regex syntax).
+     */
+    public static $HASHTAG_CHARS = '\p{Pc}\p{N}\p{L}\p{Mn}';
+
+    /**
+     * @var Bookmark[] all available bookmarks.
+     */
+    private $bookmarks;
+
+    /**
+     * @param Bookmark[] $bookmarks initialization.
+     */
+    public function __construct($bookmarks)
+    {
+        $this->bookmarks = $bookmarks;
+    }
+
+    /**
+     * Filter bookmarks according to parameters.
+     *
+     * @param string $type          Type of filter (eg. tags, permalink, etc.).
+     * @param mixed  $request       Filter content.
+     * @param bool   $casesensitive Optional: Perform case sensitive filter if true.
+     * @param string $visibility    Optional: return only all/private/public bookmarks
+     * @param bool   $untaggedonly  Optional: return only untagged bookmarks. Applies only if $type includes FILTER_TAG
+     *
+     * @return Bookmark[] filtered bookmark list.
+     *
+     * @throws BookmarkNotFoundException
+     */
+    public function filter($type, $request, $casesensitive = false, $visibility = 'all', $untaggedonly = false)
+    {
+        if (!in_array($visibility, ['all', 'public', 'private'])) {
+            $visibility = 'all';
+        }
+
+        switch ($type) {
+            case self::$FILTER_HASH:
+                return $this->filterSmallHash($request);
+            case self::$FILTER_TAG | self::$FILTER_TEXT: // == "vuotext"
+                $noRequest = empty($request) || (empty($request[0]) && empty($request[1]));
+                if ($noRequest) {
+                    if ($untaggedonly) {
+                        return $this->filterUntagged($visibility);
+                    }
+                    return $this->noFilter($visibility);
+                }
+                if ($untaggedonly) {
+                    $filtered = $this->filterUntagged($visibility);
+                } else {
+                    $filtered = $this->bookmarks;
+                }
+                if (!empty($request[0])) {
+                    $filtered = (new BookmarkFilter($filtered))->filterTags($request[0], $casesensitive, $visibility);
+                }
+                if (!empty($request[1])) {
+                    $filtered = (new BookmarkFilter($filtered))->filterFulltext($request[1], $visibility);
+                }
+                return $filtered;
+            case self::$FILTER_TEXT:
+                return $this->filterFulltext($request, $visibility);
+            case self::$FILTER_TAG:
+                if ($untaggedonly) {
+                    return $this->filterUntagged($visibility);
+                } else {
+                    return $this->filterTags($request, $casesensitive, $visibility);
+                }
+            case self::$FILTER_DAY:
+                return $this->filterDay($request, $visibility);
+            default:
+                return $this->noFilter($visibility);
+        }
+    }
+
+    /**
+     * Unknown filter, but handle private only.
+     *
+     * @param string $visibility Optional: return only all/private/public bookmarks
+     *
+     * @return Bookmark[] filtered bookmarks.
+     */
+    private function noFilter($visibility = 'all')
+    {
+        if ($visibility === 'all') {
+            return $this->bookmarks;
+        }
+
+        $out = array();
+        foreach ($this->bookmarks as $key => $value) {
+            if ($value->isPrivate() && $visibility === 'private') {
+                $out[$key] = $value;
+            } elseif (!$value->isPrivate() && $visibility === 'public') {
+                $out[$key] = $value;
+            }
+        }
+
+        return $out;
+    }
+
+    /**
+     * Returns the shaare corresponding to a smallHash.
+     *
+     * @param string $smallHash permalink hash.
+     *
+     * @return array $filtered array containing permalink data.
+     *
+     * @throws \Shaarli\Bookmark\Exception\BookmarkNotFoundException if the smallhash doesn't match any link.
+     */
+    private function filterSmallHash($smallHash)
+    {
+        foreach ($this->bookmarks as $key => $l) {
+            if ($smallHash == $l->getShortUrl()) {
+                // Yes, this is ugly and slow
+                return [$key => $l];
+            }
+        }
+
+        throw new BookmarkNotFoundException();
+    }
+
+    /**
+     * Returns the list of bookmarks corresponding to a full-text search
+     *
+     * Searches:
+     *  - in the URLs, title and description;
+     *  - are case-insensitive;
+     *  - terms surrounded by quotes " are exact terms search.
+     *  - terms starting with a dash - are excluded (except exact terms).
+     *
+     * Example:
+     *    print_r($mydb->filterFulltext('hollandais'));
+     *
+     * mb_convert_case($val, MB_CASE_LOWER, 'UTF-8')
+     *  - allows to perform searches on Unicode text
+     *  - see https://github.com/shaarli/Shaarli/issues/75 for examples
+     *
+     * @param string $searchterms search query.
+     * @param string $visibility  Optional: return only all/private/public bookmarks.
+     *
+     * @return array search results.
+     */
+    private function filterFulltext($searchterms, $visibility = 'all')
+    {
+        if (empty($searchterms)) {
+            return $this->noFilter($visibility);
+        }
+
+        $filtered = array();
+        $search = mb_convert_case(html_entity_decode($searchterms), MB_CASE_LOWER, 'UTF-8');
+        $exactRegex = '/"([^"]+)"/';
+        // Retrieve exact search terms.
+        preg_match_all($exactRegex, $search, $exactSearch);
+        $exactSearch = array_values(array_filter($exactSearch[1]));
+
+        // Remove exact search terms to get AND terms search.
+        $explodedSearchAnd = explode(' ', trim(preg_replace($exactRegex, '', $search)));
+        $explodedSearchAnd = array_values(array_filter($explodedSearchAnd));
+
+        // Filter excluding terms and update andSearch.
+        $excludeSearch = array();
+        $andSearch = array();
+        foreach ($explodedSearchAnd as $needle) {
+            if ($needle[0] == '-' && strlen($needle) > 1) {
+                $excludeSearch[] = substr($needle, 1);
+            } else {
+                $andSearch[] = $needle;
+            }
+        }
+
+        // Iterate over every stored link.
+        foreach ($this->bookmarks as $id => $link) {
+            // ignore non private bookmarks when 'privatonly' is on.
+            if ($visibility !== 'all') {
+                if (!$link->isPrivate() && $visibility === 'private') {
+                    continue;
+                } elseif ($link->isPrivate() && $visibility === 'public') {
+                    continue;
+                }
+            }
+
+            // Concatenate link fields to search across fields.
+            // Adds a '\' separator for exact search terms.
+            $content  = mb_convert_case($link->getTitle(), MB_CASE_LOWER, 'UTF-8') .'\\';
+            $content .= mb_convert_case($link->getDescription(), MB_CASE_LOWER, 'UTF-8') .'\\';
+            $content .= mb_convert_case($link->getUrl(), MB_CASE_LOWER, 'UTF-8') .'\\';
+            $content .= mb_convert_case($link->getTagsString(), MB_CASE_LOWER, 'UTF-8') .'\\';
+
+            // Be optimistic
+            $found = true;
+
+            // First, we look for exact term search
+            for ($i = 0; $i < count($exactSearch) && $found; $i++) {
+                $found = strpos($content, $exactSearch[$i]) !== false;
+            }
+
+            // Iterate over keywords, if keyword is not found,
+            // no need to check for the others. We want all or nothing.
+            for ($i = 0; $i < count($andSearch) && $found; $i++) {
+                $found = strpos($content, $andSearch[$i]) !== false;
+            }
+
+            // Exclude terms.
+            for ($i = 0; $i < count($excludeSearch) && $found; $i++) {
+                $found = strpos($content, $excludeSearch[$i]) === false;
+            }
+
+            if ($found) {
+                $filtered[$id] = $link;
+            }
+        }
+
+        return $filtered;
+    }
+
+    /**
+     * generate a regex fragment out of a tag
+     *
+     * @param string $tag to to generate regexs from. may start with '-' to negate, contain '*' as wildcard
+     *
+     * @return string generated regex fragment
+     */
+    private static function tag2regex($tag)
+    {
+        $len = strlen($tag);
+        if (!$len || $tag === "-" || $tag === "*") {
+            // nothing to search, return empty regex
+            return '';
+        }
+        if ($tag[0] === "-") {
+            // query is negated
+            $i = 1; // use offset to start after '-' character
+            $regex = '(?!'; // create negative lookahead
+        } else {
+            $i = 0; // start at first character
+            $regex = '(?='; // use positive lookahead
+        }
+        $regex .= '.*(?:^| )'; // before tag may only be a space or the beginning
+        // iterate over string, separating it into placeholder and content
+        for (; $i < $len; $i++) {
+            if ($tag[$i] === '*') {
+                // placeholder found
+                $regex .= '[^ ]*?';
+            } else {
+                // regular characters
+                $offset = strpos($tag, '*', $i);
+                if ($offset === false) {
+                    // no placeholder found, set offset to end of string
+                    $offset = $len;
+                }
+                // subtract one, as we want to get before the placeholder or end of string
+                $offset -= 1;
+                // we got a tag name that we want to search for. escape any regex characters to prevent conflicts.
+                $regex .= preg_quote(substr($tag, $i, $offset - $i + 1), '/');
+                // move $i on
+                $i = $offset;
+            }
+        }
+        $regex .= '(?:$| ))'; // after the tag may only be a space or the end
+        return $regex;
+    }
+
+    /**
+     * Returns the list of bookmarks associated with a given list of tags
+     *
+     * You can specify one or more tags, separated by space or a comma, e.g.
+     *  print_r($mydb->filterTags('linux programming'));
+     *
+     * @param string $tags          list of tags separated by commas or blank spaces.
+     * @param bool   $casesensitive ignore case if false.
+     * @param string $visibility    Optional: return only all/private/public bookmarks.
+     *
+     * @return array filtered bookmarks.
+     */
+    public function filterTags($tags, $casesensitive = false, $visibility = 'all')
+    {
+        // get single tags (we may get passed an array, even though the docs say different)
+        $inputTags = $tags;
+        if (!is_array($tags)) {
+            // we got an input string, split tags
+            $inputTags = preg_split('/(?:\s+)|,/', $inputTags, -1, PREG_SPLIT_NO_EMPTY);
+        }
+
+        if (!count($inputTags)) {
+            // no input tags
+            return $this->noFilter($visibility);
+        }
+
+        // If we only have public visibility, we can't look for hidden tags
+        if ($visibility === self::$PUBLIC) {
+            $inputTags = array_values(array_filter($inputTags, function ($tag) {
+                return ! startsWith($tag, '.');
+            }));
+
+            if (empty($inputTags)) {
+                return [];
+            }
+        }
+
+        // build regex from all tags
+        $re = '/^' . implode(array_map("self::tag2regex", $inputTags)) . '.*$/';
+        if (!$casesensitive) {
+            // make regex case insensitive
+            $re .= 'i';
+        }
+
+        // create resulting array
+        $filtered = [];
+
+        // iterate over each link
+        foreach ($this->bookmarks as $key => $link) {
+            // check level of visibility
+            // ignore non private bookmarks when 'privateonly' is on.
+            if ($visibility !== 'all') {
+                if (!$link->isPrivate() && $visibility === 'private') {
+                    continue;
+                } elseif ($link->isPrivate() && $visibility === 'public') {
+                    continue;
+                }
+            }
+            $search = $link->getTagsString(); // build search string, start with tags of current link
+            if (strlen(trim($link->getDescription())) && strpos($link->getDescription(), '#') !== false) {
+                // description given and at least one possible tag found
+                $descTags = array();
+                // find all tags in the form of #tag in the description
+                preg_match_all(
+                    '/(?<![' . self::$HASHTAG_CHARS . '])#([' . self::$HASHTAG_CHARS . ']+?)\b/sm',
+                    $link->getDescription(),
+                    $descTags
+                );
+                if (count($descTags[1])) {
+                    // there were some tags in the description, add them to the search string
+                    $search .= ' ' . implode(' ', $descTags[1]);
+                }
+            };
+            // match regular expression with search string
+            if (!preg_match($re, $search)) {
+                // this entry does _not_ match our regex
+                continue;
+            }
+            $filtered[$key] = $link;
+        }
+        return $filtered;
+    }
+
+    /**
+     * Return only bookmarks without any tag.
+     *
+     * @param string $visibility return only all/private/public bookmarks.
+     *
+     * @return array filtered bookmarks.
+     */
+    public function filterUntagged($visibility)
+    {
+        $filtered = [];
+        foreach ($this->bookmarks as $key => $link) {
+            if ($visibility !== 'all') {
+                if (!$link->isPrivate() && $visibility === 'private') {
+                    continue;
+                } elseif ($link->isPrivate() && $visibility === 'public') {
+                    continue;
+                }
+            }
+
+            if (empty(trim($link->getTagsString()))) {
+                $filtered[$key] = $link;
+            }
+        }
+
+        return $filtered;
+    }
+
+    /**
+     * Returns the list of articles for a given day, chronologically sorted
+     *
+     * Day must be in the form 'YYYYMMDD' (e.g. '20120125'), e.g.
+     *  print_r($mydb->filterDay('20120125'));
+     *
+     * @param string $day day to filter.
+     * @param string $visibility return only all/private/public bookmarks.
+
+     * @return array all link matching given day.
+     *
+     * @throws Exception if date format is invalid.
+     */
+    public function filterDay($day, $visibility)
+    {
+        if (!checkDateFormat('Ymd', $day)) {
+            throw new Exception('Invalid date format');
+        }
+
+        $filtered = [];
+        foreach ($this->bookmarks as $key => $bookmark) {
+            if ($visibility === static::$PUBLIC && $bookmark->isPrivate()) {
+                continue;
+            }
+
+            if ($bookmark->getCreated()->format('Ymd') == $day) {
+                $filtered[$key] = $bookmark;
+            }
+        }
+
+        // sort by date ASC
+        return array_reverse($filtered, true);
+    }
+
+    /**
+     * Convert a list of tags (str) to an array. Also
+     * - handle case sensitivity.
+     * - accepts spaces commas as separator.
+     *
+     * @param string $tags          string containing a list of tags.
+     * @param bool   $casesensitive will convert everything to lowercase if false.
+     *
+     * @return array filtered tags string.
+     */
+    public static function tagsStrToArray($tags, $casesensitive)
+    {
+        // We use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek)
+        $tagsOut = $casesensitive ? $tags : mb_convert_case($tags, MB_CASE_LOWER, 'UTF-8');
+        $tagsOut = str_replace(',', ' ', $tagsOut);
+
+        return preg_split('/\s+/', $tagsOut, -1, PREG_SPLIT_NO_EMPTY);
+    }
+}
diff --git a/application/bookmark/BookmarkIO.php b/application/bookmark/BookmarkIO.php
new file mode 100644
index 00000000..6bf7f365
--- /dev/null
+++ b/application/bookmark/BookmarkIO.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace Shaarli\Bookmark;
+
+use Shaarli\Bookmark\Exception\DatastoreNotInitializedException;
+use Shaarli\Bookmark\Exception\EmptyDataStoreException;
+use Shaarli\Bookmark\Exception\NotWritableDataStoreException;
+use Shaarli\Config\ConfigManager;
+
+/**
+ * Class BookmarkIO
+ *
+ * This class performs read/write operation to the file data store.
+ * Used by BookmarkFileService.
+ *
+ * @package Shaarli\Bookmark
+ */
+class BookmarkIO
+{
+    /**
+     * @var string Datastore file path
+     */
+    protected $datastore;
+
+    /**
+     * @var ConfigManager instance
+     */
+    protected $conf;
+
+    /**
+     * string Datastore PHP prefix
+     */
+    protected static $phpPrefix = '<?php /* ';
+
+    /**
+     * string Datastore PHP suffix
+     */
+    protected static $phpSuffix = ' */ ?>';
+
+    /**
+     * LinksIO constructor.
+     *
+     * @param ConfigManager $conf instance
+     */
+    public function __construct($conf)
+    {
+        $this->conf = $conf;
+        $this->datastore = $conf->get('resource.datastore');
+    }
+
+    /**
+     * Reads database from disk to memory
+     *
+     * @return BookmarkArray instance
+     *
+     * @throws NotWritableDataStoreException    Data couldn't be loaded
+     * @throws EmptyDataStoreException          Datastore file exists but does not contain any bookmark
+     * @throws DatastoreNotInitializedException File does not exists
+     */
+    public function read()
+    {
+        if (! file_exists($this->datastore)) {
+            throw new DatastoreNotInitializedException();
+        }
+
+        if (!is_writable($this->datastore)) {
+            throw new NotWritableDataStoreException($this->datastore);
+        }
+
+        // Note that gzinflate is faster than gzuncompress.
+        // See: http://www.php.net/manual/en/function.gzdeflate.php#96439
+        $links = unserialize(gzinflate(base64_decode(
+            substr(file_get_contents($this->datastore),
+                strlen(self::$phpPrefix), -strlen(self::$phpSuffix)))));
+
+        if (empty($links)) {
+            if (filesize($this->datastore) > 100) {
+                throw new NotWritableDataStoreException($this->datastore);
+            }
+            throw new EmptyDataStoreException();
+        }
+
+        return $links;
+    }
+
+    /**
+     * Saves the database from memory to disk
+     *
+     * @param BookmarkArray $links instance.
+     *
+     * @throws NotWritableDataStoreException the datastore is not writable
+     */
+    public function write($links)
+    {
+        if (is_file($this->datastore) && !is_writeable($this->datastore)) {
+            // The datastore exists but is not writeable
+            throw new NotWritableDataStoreException($this->datastore);
+        } else if (!is_file($this->datastore) && !is_writeable(dirname($this->datastore))) {
+            // The datastore does not exist and its parent directory is not writeable
+            throw new NotWritableDataStoreException(dirname($this->datastore));
+        }
+
+        file_put_contents(
+            $this->datastore,
+            self::$phpPrefix.base64_encode(gzdeflate(serialize($links))).self::$phpSuffix
+        );
+    }
+}
diff --git a/application/bookmark/BookmarkInitializer.php b/application/bookmark/BookmarkInitializer.php
new file mode 100644
index 00000000..815047e3
--- /dev/null
+++ b/application/bookmark/BookmarkInitializer.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Shaarli\Bookmark;
+
+/**
+ * Class BookmarkInitializer
+ *
+ * This class is used to initialized default bookmarks after a fresh install of Shaarli.
+ * It should be only called if the datastore file does not exist(users might want to delete the default bookmarks).
+ *
+ * To prevent data corruption, it does not overwrite existing bookmarks,
+ * even though there should not be any.
+ *
+ * @package Shaarli\Bookmark
+ */
+class BookmarkInitializer
+{
+    /** @var BookmarkServiceInterface */
+    protected $bookmarkService;
+
+    /**
+     * BookmarkInitializer constructor.
+     *
+     * @param BookmarkServiceInterface $bookmarkService
+     */
+    public function __construct($bookmarkService)
+    {
+        $this->bookmarkService = $bookmarkService;
+    }
+
+    /**
+     * Initialize the data store with default bookmarks
+     */
+    public function initialize()
+    {
+        $bookmark = new Bookmark();
+        $bookmark->setTitle('quicksilver (loop) on Vimeo ' . t('(private bookmark with thumbnail demo)'));
+        $bookmark->setUrl('https://vimeo.com/153493904');
+        $bookmark->setDescription(t(
+'Shaarli will automatically pick up the thumbnail for links to a variety of websites.
+
+Explore your new Shaarli instance by trying out controls and menus.
+Visit the project on [Github](https://github.com/shaarli/Shaarli) or [the documentation](https://shaarli.readthedocs.io/en/master/) to learn more about Shaarli.
+
+Now you can edit or delete the default shaares.
+'
+        ));
+        $bookmark->setTagsString('shaarli help thumbnail');
+        $bookmark->setPrivate(true);
+        $this->bookmarkService->add($bookmark, false);
+
+        $bookmark = new Bookmark();
+        $bookmark->setTitle(t('Note: Shaare descriptions'));
+        $bookmark->setDescription(t(
+'Adding a shaare without entering a URL creates a text-only "note" post such as this one.
+This note is private, so you are the only one able to see it while logged in.
+
+You can use this to keep notes, post articles, code snippets, and much more.
+
+The Markdown formatting setting allows you to format your notes and bookmark description:
+
+### Title headings
+
+#### Multiple headings levels
+  * bullet lists
+  * _italic_ text
+  * **bold** text
+  * ~~strike through~~ text
+  * `code` blocks
+  * images
+  * [links](https://en.wikipedia.org/wiki/Markdown)
+
+Markdown also supports tables:
+
+| Name    | Type      | Color  | Qty   |
+| ------- | --------- | ------ | ----- |
+| Orange  | Fruit     | Orange | 126   |
+| Apple   | Fruit     | Any    | 62    |
+| Lemon   | Fruit     | Yellow | 30    |
+| Carrot  | Vegetable | Red    | 14    |
+'
+        ));
+        $bookmark->setTagsString('shaarli help');
+        $bookmark->setPrivate(true);
+        $this->bookmarkService->add($bookmark, false);
+
+        $bookmark = new Bookmark();
+        $bookmark->setTitle(
+            'Shaarli - ' . t('The personal, minimalist, super-fast, database free, bookmarking service')
+        );
+        $bookmark->setDescription(t(
+'Welcome to Shaarli!
+
+Shaarli allows you to bookmark your favorite pages, and share them with others or store them privately.
+You can add a description to your bookmarks, such as this one, and tag them.
+
+Create a new shaare by clicking the `+Shaare` button, or using any of the recommended tools (browser extension, mobile app, bookmarklet, REST API, etc.).
+
+You can easily retrieve your links, even with thousands of them, using the internal search engine, or search through tags (e.g. this Shaare is tagged with `shaarli` and `help`).
+Hashtags such as #shaarli #help are also supported.
+You can also filter the available [RSS feed](/feed/atom) and picture wall by tag or plaintext search.
+
+We hope that you will enjoy using Shaarli, maintained with ❤️ by the community!
+Feel free to open [an issue](https://github.com/shaarli/Shaarli/issues) if you have a suggestion or encounter an issue.
+'
+        ));
+        $bookmark->setTagsString('shaarli help');
+        $this->bookmarkService->add($bookmark, false);
+    }
+}
diff --git a/application/bookmark/BookmarkServiceInterface.php b/application/bookmark/BookmarkServiceInterface.php
new file mode 100644
index 00000000..b9b483eb
--- /dev/null
+++ b/application/bookmark/BookmarkServiceInterface.php
@@ -0,0 +1,186 @@
+<?php
+
+namespace Shaarli\Bookmark;
+
+
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
+use Shaarli\Bookmark\Exception\NotWritableDataStoreException;
+use Shaarli\Config\ConfigManager;
+use Shaarli\History;
+
+/**
+ * Class BookmarksService
+ *
+ * This is the entry point to manipulate the bookmark DB.
+ */
+interface BookmarkServiceInterface
+{
+    /**
+     * BookmarksService constructor.
+     *
+     * @param ConfigManager $conf       instance
+     * @param History       $history    instance
+     * @param bool          $isLoggedIn true if the current user is logged in
+     */
+    public function __construct(ConfigManager $conf, History $history, $isLoggedIn);
+
+    /**
+     * Find a bookmark by hash
+     *
+     * @param string $hash
+     *
+     * @return mixed
+     *
+     * @throws \Exception
+     */
+    public function findByHash($hash);
+
+    /**
+     * @param $url
+     *
+     * @return Bookmark|null
+     */
+    public function findByUrl($url);
+
+    /**
+     * Search bookmarks
+     *
+     * @param mixed  $request
+     * @param string $visibility
+     * @param bool   $caseSensitive
+     * @param bool   $untaggedOnly
+     * @param bool   $ignoreSticky
+     *
+     * @return Bookmark[]
+     */
+    public function search(
+        $request = [],
+        $visibility = null,
+        $caseSensitive = false,
+        $untaggedOnly = false,
+        bool $ignoreSticky = false
+    );
+
+    /**
+     * Get a single bookmark by its ID.
+     *
+     * @param int    $id         Bookmark ID
+     * @param string $visibility all|public|private e.g. with public, accessing a private bookmark will throw an
+     *                           exception
+     *
+     * @return Bookmark
+     *
+     * @throws BookmarkNotFoundException
+     * @throws \Exception
+     */
+    public function get($id, $visibility = null);
+
+    /**
+     * Updates an existing bookmark (depending on its ID).
+     *
+     * @param Bookmark $bookmark
+     * @param bool     $save Writes to the datastore if set to true
+     *
+     * @return Bookmark Updated bookmark
+     *
+     * @throws BookmarkNotFoundException
+     * @throws \Exception
+     */
+    public function set($bookmark, $save = true);
+
+    /**
+     * Adds a new bookmark (the ID must be empty).
+     *
+     * @param Bookmark $bookmark
+     * @param bool     $save Writes to the datastore if set to true
+     *
+     * @return Bookmark new bookmark
+     *
+     * @throws \Exception
+     */
+    public function add($bookmark, $save = true);
+
+    /**
+     * Adds or updates a bookmark depending on its ID:
+     *   - a Bookmark without ID will be added
+     *   - a Bookmark with an existing ID will be updated
+     *
+     * @param Bookmark $bookmark
+     * @param bool     $save
+     *
+     * @return Bookmark
+     *
+     * @throws \Exception
+     */
+    public function addOrSet($bookmark, $save = true);
+
+    /**
+     * Deletes a bookmark.
+     *
+     * @param Bookmark $bookmark
+     * @param bool     $save
+     *
+     * @throws \Exception
+     */
+    public function remove($bookmark, $save = true);
+
+    /**
+     * Get a single bookmark by its ID.
+     *
+     * @param int    $id         Bookmark ID
+     * @param string $visibility all|public|private e.g. with public, accessing a private bookmark will throw an
+     *                           exception
+     *
+     * @return bool
+     */
+    public function exists($id, $visibility = null);
+
+    /**
+     * Return the number of available bookmarks for given visibility.
+     *
+     * @param string $visibility public|private|all
+     *
+     * @return int Number of bookmarks
+     */
+    public function count($visibility = null);
+
+    /**
+     * Write the datastore.
+     *
+     * @throws NotWritableDataStoreException
+     */
+    public function save();
+
+    /**
+     * Returns the list tags appearing in the bookmarks with the given tags
+     *
+     * @param array  $filteringTags tags selecting the bookmarks to consider
+     * @param string $visibility    process only all/private/public bookmarks
+     *
+     * @return array tag => bookmarksCount
+     */
+    public function bookmarksCountPerTag($filteringTags = [], $visibility = 'all');
+
+    /**
+     * Returns the list of days containing articles (oldest first)
+     *
+     * @return array containing days (in format YYYYMMDD).
+     */
+    public function days();
+
+    /**
+     * Returns the list of articles for a given day.
+     *
+     * @param string $request day to filter. Format: YYYYMMDD.
+     *
+     * @return Bookmark[] list of shaare found.
+     *
+     * @throws BookmarkNotFoundException
+     */
+    public function filterDay($request);
+
+    /**
+     * Creates the default database after a fresh install.
+     */
+    public function initialize();
+}
diff --git a/application/bookmark/LinkUtils.php b/application/bookmark/LinkUtils.php
index 77eb2d95..e7af4d55 100644
--- a/application/bookmark/LinkUtils.php
+++ b/application/bookmark/LinkUtils.php
@@ -1,112 +1,6 @@
 <?php
 
-use Shaarli\Bookmark\LinkDB;
-
-/**
- * Get cURL callback function for CURLOPT_WRITEFUNCTION
- *
- * @param string $charset     to extract from the downloaded page (reference)
- * @param string $title       to extract from the downloaded page (reference)
- * @param string $description to extract from the downloaded page (reference)
- * @param string $keywords    to extract from the downloaded page (reference)
- * @param bool   $retrieveDescription Automatically tries to retrieve description and keywords from HTML content
- * @param string $curlGetInfo Optionally overrides curl_getinfo function
- *
- * @return Closure
- */
-function get_curl_download_callback(
-    &$charset,
-    &$title,
-    &$description,
-    &$keywords,
-    $retrieveDescription,
-    $curlGetInfo = 'curl_getinfo'
-) {
-    $isRedirected = false;
-    $currentChunk = 0;
-    $foundChunk = null;
-
-    /**
-     * cURL callback function for CURLOPT_WRITEFUNCTION (called during the download).
-     *
-     * While downloading the remote page, we check that the HTTP code is 200 and content type is 'html/text'
-     * Then we extract the title and the charset and stop the download when it's done.
-     *
-     * @param resource $ch   cURL resource
-     * @param string   $data chunk of data being downloaded
-     *
-     * @return int|bool length of $data or false if we need to stop the download
-     */
-    return function (&$ch, $data) use (
-        $retrieveDescription,
-        $curlGetInfo,
-        &$charset,
-        &$title,
-        &$description,
-        &$keywords,
-        &$isRedirected,
-        &$currentChunk,
-        &$foundChunk
-    ) {
-        $currentChunk++;
-        $responseCode = $curlGetInfo($ch, CURLINFO_RESPONSE_CODE);
-        if (!empty($responseCode) && in_array($responseCode, [301, 302])) {
-            $isRedirected = true;
-            return strlen($data);
-        }
-        if (!empty($responseCode) && $responseCode !== 200) {
-            return false;
-        }
-        // After a redirection, the content type will keep the previous request value
-        // until it finds the next content-type header.
-        if (! $isRedirected || strpos(strtolower($data), 'content-type') !== false) {
-            $contentType = $curlGetInfo($ch, CURLINFO_CONTENT_TYPE);
-        }
-        if (!empty($contentType) && strpos($contentType, 'text/html') === false) {
-            return false;
-        }
-        if (!empty($contentType) && empty($charset)) {
-            $charset = header_extract_charset($contentType);
-        }
-        if (empty($charset)) {
-            $charset = html_extract_charset($data);
-        }
-        if (empty($title)) {
-            $title = html_extract_title($data);
-            $foundChunk = ! empty($title) ? $currentChunk : $foundChunk;
-        }
-        if ($retrieveDescription && empty($description)) {
-            $description = html_extract_tag('description', $data);
-            $foundChunk = ! empty($description) ? $currentChunk : $foundChunk;
-        }
-        if ($retrieveDescription && empty($keywords)) {
-            $keywords = html_extract_tag('keywords', $data);
-            if (! empty($keywords)) {
-                $foundChunk = $currentChunk;
-                // Keywords use the format tag1, tag2 multiple words, tag
-                // So we format them to match Shaarli's separator and glue multiple words with '-'
-                $keywords = implode(' ', array_map(function($keyword) {
-                    return implode('-', preg_split('/\s+/', trim($keyword)));
-                }, explode(',', $keywords)));
-            }
-        }
-
-        // We got everything we want, stop the download.
-        // If we already found either the title, description or keywords,
-        // it's highly unlikely that we'll found the other metas further than
-        // in the same chunk of data or the next one. So we also stop the download after that.
-        if ((!empty($responseCode) && !empty($contentType) && !empty($charset)) && $foundChunk !== null
-            && (! $retrieveDescription
-                || $foundChunk < $currentChunk
-                || (!empty($title) && !empty($description) && !empty($keywords))
-            )
-        ) {
-            return false;
-        }
-
-        return strlen($data);
-    };
-}
+use Shaarli\Bookmark\Bookmark;
 
 /**
  * Extract title from an HTML document.
@@ -132,7 +26,7 @@ function html_extract_title($html)
  */
 function header_extract_charset($header)
 {
-    preg_match('/charset="?([^; ]+)/i', $header, $match);
+    preg_match('/charset=["\']?([^; "\']+)/i', $header, $match);
     if (! empty($match[1])) {
         return strtolower(trim($match[1]));
     }
@@ -188,30 +82,11 @@ function html_extract_tag($tag, $html)
 }
 
 /**
- * Count private links in given linklist.
- *
- * @param array|Countable $links Linklist.
- *
- * @return int Number of private links.
- */
-function count_private($links)
-{
-    $cpt = 0;
-    foreach ($links as $link) {
-        if ($link['private']) {
-            $cpt += 1;
-        }
-    }
-
-    return $cpt;
-}
-
-/**
- * In a string, converts URLs to clickable links.
+ * In a string, converts URLs to clickable bookmarks.
  *
  * @param string $text       input string.
  *
- * @return string returns $text with all links converted to HTML links.
+ * @return string returns $text with all bookmarks converted to HTML bookmarks.
  *
  * @see Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
  */
@@ -239,7 +114,7 @@ function hashtag_autolink($description, $indexUrl = '')
      * \p{Mn} - any non marking space (accents, umlauts, etc)
      */
     $regex = '/(^|\s)#([\p{Pc}\p{N}\p{L}\p{Mn}]+)/mui';
-    $replacement = '$1<a href="'. $indexUrl .'?addtag=$2" title="Hashtag $2">#$2</a>';
+    $replacement = '$1<a href="'. $indexUrl .'./add-tag/$2" title="Hashtag $2">#$2</a>';
     return preg_replace($regex, $replacement, $description);
 }
 
@@ -279,7 +154,7 @@ function format_description($description, $indexUrl = '')
  */
 function link_small_hash($date, $id)
 {
-    return smallHash($date->format(LinkDB::LINK_DATE_FORMAT) . $id);
+    return smallHash($date->format(Bookmark::LINK_DATE_FORMAT) . $id);
 }
 
 /**
diff --git a/application/bookmark/exception/LinkNotFoundException.php b/application/bookmark/exception/BookmarkNotFoundException.php
index f9414428..827a3d35 100644
--- a/application/bookmark/exception/LinkNotFoundException.php
+++ b/application/bookmark/exception/BookmarkNotFoundException.php
@@ -3,7 +3,7 @@ namespace Shaarli\Bookmark\Exception;
 
 use Exception;
 
-class LinkNotFoundException extends Exception
+class BookmarkNotFoundException extends Exception
 {
     /**
      * LinkNotFoundException constructor.
diff --git a/application/bookmark/exception/DatastoreNotInitializedException.php b/application/bookmark/exception/DatastoreNotInitializedException.php
new file mode 100644
index 00000000..f495049d
--- /dev/null
+++ b/application/bookmark/exception/DatastoreNotInitializedException.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Bookmark\Exception;
+
+class DatastoreNotInitializedException extends \Exception
+{
+
+}
diff --git a/application/bookmark/exception/EmptyDataStoreException.php b/application/bookmark/exception/EmptyDataStoreException.php
new file mode 100644
index 00000000..cd48c1e6
--- /dev/null
+++ b/application/bookmark/exception/EmptyDataStoreException.php
@@ -0,0 +1,7 @@
+<?php
+
+
+namespace Shaarli\Bookmark\Exception;
+
+
+class EmptyDataStoreException extends \Exception {}
diff --git a/application/bookmark/exception/InvalidBookmarkException.php b/application/bookmark/exception/InvalidBookmarkException.php
new file mode 100644
index 00000000..10c84a6d
--- /dev/null
+++ b/application/bookmark/exception/InvalidBookmarkException.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Shaarli\Bookmark\Exception;
+
+use Shaarli\Bookmark\Bookmark;
+
+class InvalidBookmarkException extends \Exception
+{
+    public function __construct($bookmark)
+    {
+        if ($bookmark instanceof Bookmark) {
+            if ($bookmark->getCreated() instanceof \DateTime) {
+                $created = $bookmark->getCreated()->format(\DateTime::ATOM);
+            } elseif (empty($bookmark->getCreated())) {
+                $created = '';
+            } else {
+                $created = 'Not a DateTime object';
+            }
+            $this->message = 'This bookmark is not valid'. PHP_EOL;
+            $this->message .= ' - ID: '. $bookmark->getId() . PHP_EOL;
+            $this->message .= ' - Title: '. $bookmark->getTitle() . PHP_EOL;
+            $this->message .= ' - Url: '. $bookmark->getUrl() . PHP_EOL;
+            $this->message .= ' - ShortUrl: '. $bookmark->getShortUrl() . PHP_EOL;
+            $this->message .= ' - Created: '. $created . PHP_EOL;
+        } else {
+            $this->message = 'The provided data is not a bookmark'. PHP_EOL;
+            $this->message .= var_export($bookmark, true);
+        }
+    }
+}
diff --git a/application/bookmark/exception/NotWritableDataStoreException.php b/application/bookmark/exception/NotWritableDataStoreException.php
new file mode 100644
index 00000000..95f34b50
--- /dev/null
+++ b/application/bookmark/exception/NotWritableDataStoreException.php
@@ -0,0 +1,19 @@
+<?php
+
+
+namespace Shaarli\Bookmark\Exception;
+
+
+class NotWritableDataStoreException extends \Exception
+{
+    /**
+     * NotReadableDataStore constructor.
+     *
+     * @param string $dataStore file path
+     */
+    public function __construct($dataStore)
+    {
+        $this->message = 'Couldn\'t load data from the data store file "'. $dataStore .'". '.
+            'Your data might be corrupted, or your file isn\'t readable.';
+    }
+}
diff --git a/application/config/ConfigJson.php b/application/config/ConfigJson.php
index 4509357c..c0c0dab9 100644
--- a/application/config/ConfigJson.php
+++ b/application/config/ConfigJson.php
@@ -46,7 +46,7 @@ class ConfigJson implements ConfigIO
         // JSON_PRETTY_PRINT is available from PHP 5.4.
         $print = defined('JSON_PRETTY_PRINT') ? JSON_PRETTY_PRINT : 0;
         $data = self::getPhpHeaders() . json_encode($conf, $print) . self::getPhpSuffix();
-        if (!file_put_contents($filepath, $data)) {
+        if (empty($filepath) || !file_put_contents($filepath, $data)) {
             throw new \Shaarli\Exceptions\IOException(
                 $filepath,
                 t('Shaarli could not create the config file. '.
diff --git a/application/config/ConfigManager.php b/application/config/ConfigManager.php
index c95e6800..4c98be30 100644
--- a/application/config/ConfigManager.php
+++ b/application/config/ConfigManager.php
@@ -3,6 +3,7 @@ namespace Shaarli\Config;
 
 use Shaarli\Config\Exception\MissingFieldConfigException;
 use Shaarli\Config\Exception\UnauthorizedConfigException;
+use Shaarli\Thumbnailer;
 
 /**
  * Class ConfigManager
@@ -361,7 +362,7 @@ class ConfigManager
         $this->setEmpty('security.open_shaarli', false);
         $this->setEmpty('security.allowed_protocols', ['ftp', 'ftps', 'magnet']);
 
-        $this->setEmpty('general.header_link', '?');
+        $this->setEmpty('general.header_link', '/');
         $this->setEmpty('general.links_per_page', 20);
         $this->setEmpty('general.enabled_plugins', self::$DEFAULT_PLUGINS);
         $this->setEmpty('general.default_note_title', 'Note: ');
@@ -381,6 +382,7 @@ class ConfigManager
         // default state of the 'remember me' checkbox of the login form
         $this->setEmpty('privacy.remember_user_default', true);
 
+        $this->setEmpty('thumbnails.mode', Thumbnailer::MODE_ALL);
         $this->setEmpty('thumbnails.width', '125');
         $this->setEmpty('thumbnails.height', '90');
 
@@ -389,6 +391,8 @@ class ConfigManager
         $this->setEmpty('translation.extensions', []);
 
         $this->setEmpty('plugins', array());
+
+        $this->setEmpty('formatter', 'markdown');
     }
 
     /**
diff --git a/application/config/ConfigPlugin.php b/application/config/ConfigPlugin.php
index dbb24937..ea8dfbda 100644
--- a/application/config/ConfigPlugin.php
+++ b/application/config/ConfigPlugin.php
@@ -1,6 +1,7 @@
 <?php
 
 use Shaarli\Config\Exception\PluginConfigOrderException;
+use Shaarli\Plugin\PluginManager;
 
 /**
  * Plugin configuration helper functions.
@@ -19,6 +20,20 @@ use Shaarli\Config\Exception\PluginConfigOrderException;
  */
 function save_plugin_config($formData)
 {
+    // We can only save existing plugins
+    $directories = str_replace(
+        PluginManager::$PLUGINS_PATH . '/',
+        '',
+        glob(PluginManager::$PLUGINS_PATH . '/*')
+    );
+    $formData = array_filter(
+        $formData,
+        function ($value, string $key) use ($directories) {
+            return startsWith($key, 'order') || in_array($key, $directories);
+        },
+        ARRAY_FILTER_USE_BOTH
+    );
+
     // Make sure there are no duplicates in orders.
     if (!validate_plugin_order($formData)) {
         throw new PluginConfigOrderException();
@@ -69,7 +84,7 @@ function validate_plugin_order($formData)
     $orders = array();
     foreach ($formData as $key => $value) {
         // No duplicate order allowed.
-        if (in_array($value, $orders)) {
+        if (in_array($value, $orders, true)) {
             return false;
         }
 
diff --git a/application/container/ContainerBuilder.php b/application/container/ContainerBuilder.php
new file mode 100644
index 00000000..55bb51b5
--- /dev/null
+++ b/application/container/ContainerBuilder.php
@@ -0,0 +1,165 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Container;
+
+use Shaarli\Bookmark\BookmarkFileService;
+use Shaarli\Bookmark\BookmarkServiceInterface;
+use Shaarli\Config\ConfigManager;
+use Shaarli\Feed\FeedBuilder;
+use Shaarli\Formatter\FormatterFactory;
+use Shaarli\Front\Controller\Visitor\ErrorController;
+use Shaarli\Front\Controller\Visitor\ErrorNotFoundController;
+use Shaarli\History;
+use Shaarli\Http\HttpAccess;
+use Shaarli\Netscape\NetscapeBookmarkUtils;
+use Shaarli\Plugin\PluginManager;
+use Shaarli\Render\PageBuilder;
+use Shaarli\Render\PageCacheManager;
+use Shaarli\Security\CookieManager;
+use Shaarli\Security\LoginManager;
+use Shaarli\Security\SessionManager;
+use Shaarli\Thumbnailer;
+use Shaarli\Updater\Updater;
+use Shaarli\Updater\UpdaterUtils;
+
+/**
+ * Class ContainerBuilder
+ *
+ * Helper used to build a Slim container instance with Shaarli's object dependencies.
+ * Note that most injected objects MUST be added as closures, to let the container instantiate
+ * only the objects it requires during the execution.
+ *
+ * @package Container
+ */
+class ContainerBuilder
+{
+    /** @var ConfigManager */
+    protected $conf;
+
+    /** @var SessionManager */
+    protected $session;
+
+    /** @var CookieManager */
+    protected $cookieManager;
+
+    /** @var LoginManager */
+    protected $login;
+
+    /** @var string|null */
+    protected $basePath = null;
+
+    public function __construct(
+        ConfigManager $conf,
+        SessionManager $session,
+        CookieManager $cookieManager,
+        LoginManager $login
+    ) {
+        $this->conf = $conf;
+        $this->session = $session;
+        $this->login = $login;
+        $this->cookieManager = $cookieManager;
+    }
+
+    public function build(): ShaarliContainer
+    {
+        $container = new ShaarliContainer();
+
+        $container['conf'] = $this->conf;
+        $container['sessionManager'] = $this->session;
+        $container['cookieManager'] = $this->cookieManager;
+        $container['loginManager'] = $this->login;
+        $container['basePath'] = $this->basePath;
+
+        $container['plugins'] = function (ShaarliContainer $container): PluginManager {
+            return new PluginManager($container->conf);
+        };
+
+        $container['history'] = function (ShaarliContainer $container): History {
+            return new History($container->conf->get('resource.history'));
+        };
+
+        $container['bookmarkService'] = function (ShaarliContainer $container): BookmarkServiceInterface {
+            return new BookmarkFileService(
+                $container->conf,
+                $container->history,
+                $container->loginManager->isLoggedIn()
+            );
+        };
+
+        $container['pageBuilder'] = function (ShaarliContainer $container): PageBuilder {
+            return new PageBuilder(
+                $container->conf,
+                $container->sessionManager->getSession(),
+                $container->bookmarkService,
+                $container->sessionManager->generateToken(),
+                $container->loginManager->isLoggedIn()
+            );
+        };
+
+        $container['pluginManager'] = function (ShaarliContainer $container): PluginManager {
+            $pluginManager = new PluginManager($container->conf);
+
+            $pluginManager->load($container->conf->get('general.enabled_plugins'));
+
+            return $pluginManager;
+        };
+
+        $container['formatterFactory'] = function (ShaarliContainer $container): FormatterFactory {
+            return new FormatterFactory(
+                $container->conf,
+                $container->loginManager->isLoggedIn()
+            );
+        };
+
+        $container['pageCacheManager'] = function (ShaarliContainer $container): PageCacheManager {
+            return new PageCacheManager(
+                $container->conf->get('resource.page_cache'),
+                $container->loginManager->isLoggedIn()
+            );
+        };
+
+        $container['feedBuilder'] = function (ShaarliContainer $container): FeedBuilder {
+            return new FeedBuilder(
+                $container->bookmarkService,
+                $container->formatterFactory->getFormatter(),
+                $container->environment,
+                $container->loginManager->isLoggedIn()
+            );
+        };
+
+        $container['thumbnailer'] = function (ShaarliContainer $container): Thumbnailer {
+            return new Thumbnailer($container->conf);
+        };
+
+        $container['httpAccess'] = function (): HttpAccess {
+            return new HttpAccess();
+        };
+
+        $container['netscapeBookmarkUtils'] = function (ShaarliContainer $container): NetscapeBookmarkUtils {
+            return new NetscapeBookmarkUtils($container->bookmarkService, $container->conf, $container->history);
+        };
+
+        $container['updater'] = function (ShaarliContainer $container): Updater {
+            return new Updater(
+                UpdaterUtils::read_updates_file($container->conf->get('resource.updates')),
+                $container->bookmarkService,
+                $container->conf,
+                $container->loginManager->isLoggedIn()
+            );
+        };
+
+        $container['notFoundHandler'] = function (ShaarliContainer $container): ErrorNotFoundController {
+            return new ErrorNotFoundController($container);
+        };
+        $container['errorHandler'] = function (ShaarliContainer $container): ErrorController {
+            return new ErrorController($container);
+        };
+        $container['phpErrorHandler'] = function (ShaarliContainer $container): ErrorController {
+            return new ErrorController($container);
+        };
+
+        return $container;
+    }
+}
diff --git a/application/container/ShaarliContainer.php b/application/container/ShaarliContainer.php
new file mode 100644
index 00000000..66e669aa
--- /dev/null
+++ b/application/container/ShaarliContainer.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Container;
+
+use Shaarli\Bookmark\BookmarkServiceInterface;
+use Shaarli\Config\ConfigManager;
+use Shaarli\Feed\FeedBuilder;
+use Shaarli\Formatter\FormatterFactory;
+use Shaarli\History;
+use Shaarli\Http\HttpAccess;
+use Shaarli\Netscape\NetscapeBookmarkUtils;
+use Shaarli\Plugin\PluginManager;
+use Shaarli\Render\PageBuilder;
+use Shaarli\Render\PageCacheManager;
+use Shaarli\Security\CookieManager;
+use Shaarli\Security\LoginManager;
+use Shaarli\Security\SessionManager;
+use Shaarli\Thumbnailer;
+use Shaarli\Updater\Updater;
+use Slim\Container;
+
+/**
+ * Extension of Slim container to document the injected objects.
+ *
+ * @property string                   $basePath              Shaarli's instance base path (e.g. `/shaarli/`)
+ * @property BookmarkServiceInterface $bookmarkService
+ * @property CookieManager            $cookieManager
+ * @property ConfigManager            $conf
+ * @property mixed[]                  $environment           $_SERVER automatically injected by Slim
+ * @property callable                 $errorHandler          Overrides default Slim exception display
+ * @property FeedBuilder              $feedBuilder
+ * @property FormatterFactory         $formatterFactory
+ * @property History                  $history
+ * @property HttpAccess               $httpAccess
+ * @property LoginManager             $loginManager
+ * @property NetscapeBookmarkUtils    $netscapeBookmarkUtils
+ * @property callable                 $notFoundHandler       Overrides default Slim exception display
+ * @property PageBuilder              $pageBuilder
+ * @property PageCacheManager         $pageCacheManager
+ * @property callable                 $phpErrorHandler       Overrides default Slim PHP error display
+ * @property PluginManager            $pluginManager
+ * @property SessionManager           $sessionManager
+ * @property Thumbnailer              $thumbnailer
+ * @property Updater                  $updater
+ */
+class ShaarliContainer extends Container
+{
+
+}
diff --git a/application/feed/Cache.php b/application/feed/Cache.php
deleted file mode 100644
index e5d43e61..00000000
--- a/application/feed/Cache.php
+++ /dev/null
@@ -1,38 +0,0 @@
-<?php
-/**
- * Cache utilities
- */
-
-/**
- * Purges all cached pages
- *
- * @param string $pageCacheDir page cache directory
- *
- * @return mixed an error string if the directory is missing
- */
-function purgeCachedPages($pageCacheDir)
-{
-    if (! is_dir($pageCacheDir)) {
-        $error = sprintf(t('Cannot purge %s: no directory'), $pageCacheDir);
-        error_log($error);
-        return $error;
-    }
-
-    array_map('unlink', glob($pageCacheDir.'/*.cache'));
-}
-
-/**
- * Invalidates caches when the database is changed or the user logs out.
- *
- * @param string $pageCacheDir page cache directory
- */
-function invalidateCaches($pageCacheDir)
-{
-    // Purge cache attached to session.
-    if (isset($_SESSION['tags'])) {
-        unset($_SESSION['tags']);
-    }
-
-    // Purge page cache shared by sessions.
-    purgeCachedPages($pageCacheDir);
-}
diff --git a/application/feed/FeedBuilder.php b/application/feed/FeedBuilder.php
index 7c859474..f6def630 100644
--- a/application/feed/FeedBuilder.php
+++ b/application/feed/FeedBuilder.php
@@ -2,6 +2,9 @@
 namespace Shaarli\Feed;
 
 use DateTime;
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Bookmark\BookmarkServiceInterface;
+use Shaarli\Formatter\BookmarkFormatter;
 
 /**
  * FeedBuilder class.
@@ -26,37 +29,30 @@ class FeedBuilder
     public static $DEFAULT_LANGUAGE = 'en-en';
 
     /**
-     * @var int Number of links to display in a feed by default.
+     * @var int Number of bookmarks to display in a feed by default.
      */
     public static $DEFAULT_NB_LINKS = 50;
 
     /**
-     * @var \Shaarli\Bookmark\LinkDB instance.
+     * @var BookmarkServiceInterface instance.
      */
     protected $linkDB;
 
     /**
-     * @var string RSS or ATOM feed.
+     * @var BookmarkFormatter instance.
      */
-    protected $feedType;
+    protected $formatter;
 
-    /**
-     * @var array $_SERVER
-     */
+    /** @var mixed[] $_SERVER */
     protected $serverInfo;
 
     /**
-     * @var array $_GET
-     */
-    protected $userInput;
-
-    /**
      * @var boolean True if the user is currently logged in, false otherwise.
      */
     protected $isLoggedIn;
 
     /**
-     * @var boolean Use permalinks instead of direct links if true.
+     * @var boolean Use permalinks instead of direct bookmarks if true.
      */
     protected $usePermalinks;
 
@@ -69,7 +65,6 @@ class FeedBuilder
      * @var string server locale.
      */
     protected $locale;
-
     /**
      * @var DateTime Latest item date.
      */
@@ -78,38 +73,38 @@ class FeedBuilder
     /**
      * Feed constructor.
      *
-     * @param \Shaarli\Bookmark\LinkDB $linkDB     LinkDB instance.
-     * @param string                   $feedType   Type of feed.
+     * @param BookmarkServiceInterface $linkDB     LinkDB instance.
+     * @param BookmarkFormatter        $formatter  instance.
      * @param array                    $serverInfo $_SERVER.
-     * @param array                    $userInput  $_GET.
-     * @param boolean                  $isLoggedIn True if the user is currently logged in,
-     *                                             false otherwise.
+     * @param boolean                  $isLoggedIn True if the user is currently logged in, false otherwise.
      */
-    public function __construct($linkDB, $feedType, $serverInfo, $userInput, $isLoggedIn)
+    public function __construct($linkDB, $formatter, $serverInfo, $isLoggedIn)
     {
         $this->linkDB = $linkDB;
-        $this->feedType = $feedType;
+        $this->formatter = $formatter;
         $this->serverInfo = $serverInfo;
-        $this->userInput = $userInput;
         $this->isLoggedIn = $isLoggedIn;
     }
 
     /**
      * Build data for feed templates.
      *
+     * @param string $feedType   Type of feed (RSS/ATOM).
+     * @param array  $userInput  $_GET.
+     *
      * @return array Formatted data for feeds templates.
      */
-    public function buildData()
+    public function buildData(string $feedType, ?array $userInput)
     {
-        // Search for untagged links
-        if (isset($this->userInput['searchtags']) && empty($this->userInput['searchtags'])) {
-            $this->userInput['searchtags'] = false;
+        // Search for untagged bookmarks
+        if (isset($this->userInput['searchtags']) && empty($userInput['searchtags'])) {
+            $userInput['searchtags'] = false;
         }
 
         // Optionally filter the results:
-        $linksToDisplay = $this->linkDB->filterSearch($this->userInput);
+        $linksToDisplay = $this->linkDB->search($userInput, null, false, false, true);
 
-        $nblinksToDisplay = $this->getNbLinks(count($linksToDisplay));
+        $nblinksToDisplay = $this->getNbLinks(count($linksToDisplay), $userInput);
 
         // Can't use array_keys() because $link is a LinkDB instance and not a real array.
         $keys = array();
@@ -118,17 +113,18 @@ class FeedBuilder
         }
 
         $pageaddr = escape(index_url($this->serverInfo));
+        $this->formatter->addContextData('index_url', $pageaddr);
         $linkDisplayed = array();
         for ($i = 0; $i < $nblinksToDisplay && $i < count($keys); $i++) {
-            $linkDisplayed[$keys[$i]] = $this->buildItem($linksToDisplay[$keys[$i]], $pageaddr);
+            $linkDisplayed[$keys[$i]] = $this->buildItem($feedType, $linksToDisplay[$keys[$i]], $pageaddr);
         }
 
-        $data['language'] = $this->getTypeLanguage();
-        $data['last_update'] = $this->getLatestDateFormatted();
+        $data['language'] = $this->getTypeLanguage($feedType);
+        $data['last_update'] = $this->getLatestDateFormatted($feedType);
         $data['show_dates'] = !$this->hideDates || $this->isLoggedIn;
-        // Remove leading slash from REQUEST_URI.
-        $data['self_link'] = escape(server_url($this->serverInfo))
-            . escape($this->serverInfo['REQUEST_URI']);
+        // Remove leading path from REQUEST_URI (already contained in $pageaddr).
+        $requestUri = preg_replace('#(.*?/)(feed.*)#', '$2', escape($this->serverInfo['REQUEST_URI']));
+        $data['self_link'] = $pageaddr . $requestUri;
         $data['index_url'] = $pageaddr;
         $data['usepermalinks'] = $this->usePermalinks === true;
         $data['links'] = $linkDisplayed;
@@ -137,56 +133,7 @@ class FeedBuilder
     }
 
     /**
-     * Build a feed item (one per shaare).
-     *
-     * @param array  $link     Single link array extracted from LinkDB.
-     * @param string $pageaddr Index URL.
-     *
-     * @return array Link array with feed attributes.
-     */
-    protected function buildItem($link, $pageaddr)
-    {
-        $link['guid'] = $pageaddr . '?' . $link['shorturl'];
-        // Prepend the root URL for notes
-        if (is_note($link['url'])) {
-            $link['url'] = $pageaddr . $link['url'];
-        }
-        if ($this->usePermalinks === true) {
-            $permalink = '<a href="' . $link['url'] . '" title="' . t('Direct link') . '">' . t('Direct link') . '</a>';
-        } else {
-            $permalink = '<a href="' . $link['guid'] . '" title="' . t('Permalink') . '">' . t('Permalink') . '</a>';
-        }
-        $link['description'] = format_description($link['description'], $pageaddr);
-        $link['description'] .= PHP_EOL . '<br>&#8212; ' . $permalink;
-
-        $pubDate = $link['created'];
-        $link['pub_iso_date'] = $this->getIsoDate($pubDate);
-
-        // atom:entry elements MUST contain exactly one atom:updated element.
-        if (!empty($link['updated'])) {
-            $upDate = $link['updated'];
-            $link['up_iso_date'] = $this->getIsoDate($upDate, DateTime::ATOM);
-        } else {
-            $link['up_iso_date'] = $this->getIsoDate($pubDate, DateTime::ATOM);
-        }
-
-        // Save the more recent item.
-        if (empty($this->latestDate) || $this->latestDate < $pubDate) {
-            $this->latestDate = $pubDate;
-        }
-        if (!empty($upDate) && $this->latestDate < $upDate) {
-            $this->latestDate = $upDate;
-        }
-
-        $taglist = array_filter(explode(' ', $link['tags']), 'strlen');
-        uasort($taglist, 'strcasecmp');
-        $link['taglist'] = $taglist;
-
-        return $link;
-    }
-
-    /**
-     * Set this to true to use permalinks instead of direct links.
+     * Set this to true to use permalinks instead of direct bookmarks.
      *
      * @param boolean $usePermalinks true to force permalinks.
      */
@@ -216,21 +163,63 @@ class FeedBuilder
     }
 
     /**
+     * Build a feed item (one per shaare).
+     *
+     * @param string $feedType Type of feed (RSS/ATOM).
+     * @param Bookmark $link     Single link array extracted from LinkDB.
+     * @param string   $pageaddr Index URL.
+     *
+     * @return array Link array with feed attributes.
+     */
+    protected function buildItem(string $feedType, $link, $pageaddr)
+    {
+        $data = $this->formatter->format($link);
+        $data['guid'] = rtrim($pageaddr, '/') . '/shaare/' . $data['shorturl'];
+        if ($this->usePermalinks === true) {
+            $permalink = '<a href="'. $data['url'] .'" title="'. t('Direct link') .'">'. t('Direct link') .'</a>';
+        } else {
+            $permalink = '<a href="'. $data['guid'] .'" title="'. t('Permalink') .'">'. t('Permalink') .'</a>';
+        }
+        $data['description'] .= PHP_EOL . PHP_EOL . '<br>&#8212; ' . $permalink;
+
+        $data['pub_iso_date'] = $this->getIsoDate($feedType, $data['created']);
+
+        // atom:entry elements MUST contain exactly one atom:updated element.
+        if (!empty($link->getUpdated())) {
+            $data['up_iso_date'] = $this->getIsoDate($feedType, $data['updated'], DateTime::ATOM);
+        } else {
+            $data['up_iso_date'] = $this->getIsoDate($feedType, $data['created'], DateTime::ATOM);
+        }
+
+        // Save the more recent item.
+        if (empty($this->latestDate) || $this->latestDate < $data['created']) {
+            $this->latestDate = $data['created'];
+        }
+        if (!empty($data['updated']) && $this->latestDate < $data['updated']) {
+            $this->latestDate = $data['updated'];
+        }
+
+        return $data;
+    }
+
+    /**
      * Get the language according to the feed type, based on the locale:
      *
      *   - RSS format: en-us (default: 'en-en').
      *   - ATOM format: fr (default: 'en').
      *
+     * @param string $feedType Type of feed (RSS/ATOM).
+     *
      * @return string The language.
      */
-    public function getTypeLanguage()
+    protected function getTypeLanguage(string $feedType)
     {
         // Use the locale do define the language, if available.
         if (!empty($this->locale) && preg_match('/^\w{2}[_\-]\w{2}/', $this->locale)) {
-            $length = ($this->feedType === self::$FEED_RSS) ? 5 : 2;
+            $length = ($feedType === self::$FEED_RSS) ? 5 : 2;
             return str_replace('_', '-', substr($this->locale, 0, $length));
         }
-        return ($this->feedType === self::$FEED_RSS) ? 'en-en' : 'en';
+        return ($feedType === self::$FEED_RSS) ? 'en-en' : 'en';
     }
 
     /**
@@ -238,32 +227,35 @@ class FeedBuilder
      *
      * Return an empty string if invalid DateTime is passed.
      *
+     * @param string $feedType Type of feed (RSS/ATOM).
+     *
      * @return string Formatted date.
      */
-    protected function getLatestDateFormatted()
+    protected function getLatestDateFormatted(string $feedType)
     {
         if (empty($this->latestDate) || !$this->latestDate instanceof DateTime) {
             return '';
         }
 
-        $type = ($this->feedType == self::$FEED_RSS) ? DateTime::RSS : DateTime::ATOM;
+        $type = ($feedType == self::$FEED_RSS) ? DateTime::RSS : DateTime::ATOM;
         return $this->latestDate->format($type);
     }
 
     /**
      * Get ISO date from DateTime according to feed type.
      *
+     * @param string      $feedType Type of feed (RSS/ATOM).
      * @param DateTime    $date   Date to format.
      * @param string|bool $format Force format.
      *
      * @return string Formatted date.
      */
-    protected function getIsoDate(DateTime $date, $format = false)
+    protected function getIsoDate(string $feedType, DateTime $date, $format = false)
     {
         if ($format !== false) {
             return $date->format($format);
         }
-        if ($this->feedType == self::$FEED_RSS) {
+        if ($feedType == self::$FEED_RSS) {
             return $date->format(DateTime::RSS);
         }
         return $date->format(DateTime::ATOM);
@@ -273,23 +265,24 @@ class FeedBuilder
      * Returns the number of link to display according to 'nb' user input parameter.
      *
      * If 'nb' not set or invalid, default value: $DEFAULT_NB_LINKS.
-     * If 'nb' is set to 'all', display all filtered links (max parameter).
+     * If 'nb' is set to 'all', display all filtered bookmarks (max parameter).
      *
-     * @param int $max maximum number of links to display.
+     * @param int   $max       maximum number of bookmarks to display.
+     * @param array $userInput $_GET.
      *
-     * @return int number of links to display.
+     * @return int number of bookmarks to display.
      */
-    public function getNbLinks($max)
+    protected function getNbLinks($max, ?array $userInput)
     {
-        if (empty($this->userInput['nb'])) {
+        if (empty($userInput['nb'])) {
             return self::$DEFAULT_NB_LINKS;
         }
 
-        if ($this->userInput['nb'] == 'all') {
+        if ($userInput['nb'] == 'all') {
             return $max;
         }
 
-        $intNb = intval($this->userInput['nb']);
+        $intNb = intval($userInput['nb']);
         if (!is_int($intNb) || $intNb == 0) {
             return self::$DEFAULT_NB_LINKS;
         }
diff --git a/application/formatter/BookmarkDefaultFormatter.php b/application/formatter/BookmarkDefaultFormatter.php
new file mode 100644
index 00000000..9d4a0fa0
--- /dev/null
+++ b/application/formatter/BookmarkDefaultFormatter.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+/**
+ * Class BookmarkDefaultFormatter
+ *
+ * Default bookmark formatter.
+ * Escape values for HTML display and automatically add link to URL and hashtags.
+ *
+ * @package Shaarli\Formatter
+ */
+class BookmarkDefaultFormatter extends BookmarkFormatter
+{
+    /**
+     * @inheritdoc
+     */
+    public function formatTitle($bookmark)
+    {
+        return escape($bookmark->getTitle());
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatDescription($bookmark)
+    {
+        $indexUrl = ! empty($this->contextData['index_url']) ? $this->contextData['index_url'] : '';
+        return format_description(escape($bookmark->getDescription()), $indexUrl);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function formatTagList($bookmark)
+    {
+        return escape(parent::formatTagList($bookmark));
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatTagString($bookmark)
+    {
+        return implode(' ', $this->formatTagList($bookmark));
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatUrl($bookmark)
+    {
+        if ($bookmark->isNote() && isset($this->contextData['index_url'])) {
+            return rtrim($this->contextData['index_url'], '/') . '/' . escape(ltrim($bookmark->getUrl(), '/'));
+        }
+
+        return escape($bookmark->getUrl());
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function formatRealUrl($bookmark)
+    {
+        if ($bookmark->isNote()) {
+            if (isset($this->contextData['index_url'])) {
+                $prefix = rtrim($this->contextData['index_url'], '/') . '/';
+            }
+
+            if (isset($this->contextData['base_path'])) {
+                $prefix = rtrim($this->contextData['base_path'], '/') . '/';
+            }
+
+            return escape($prefix ?? '') . escape(ltrim($bookmark->getUrl(), '/'));
+        }
+
+        return escape($bookmark->getUrl());
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function formatThumbnail($bookmark)
+    {
+        return escape($bookmark->getThumbnail());
+    }
+}
diff --git a/application/formatter/BookmarkFormatter.php b/application/formatter/BookmarkFormatter.php
new file mode 100644
index 00000000..0042dafe
--- /dev/null
+++ b/application/formatter/BookmarkFormatter.php
@@ -0,0 +1,313 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+use DateTime;
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Config\ConfigManager;
+
+/**
+ * Class BookmarkFormatter
+ *
+ * Abstract class processing all bookmark attributes through methods designed to be overridden.
+ *
+ * @package Shaarli\Formatter
+ */
+abstract class BookmarkFormatter
+{
+    /**
+     * @var ConfigManager
+     */
+    protected $conf;
+
+    /** @var bool */
+    protected $isLoggedIn;
+
+    /**
+     * @var array Additional parameters than can be used for specific formatting
+     *            e.g. index_url for Feed formatting
+     */
+    protected $contextData = [];
+
+    /**
+     * LinkDefaultFormatter constructor.
+     * @param ConfigManager $conf
+     */
+    public function __construct(ConfigManager $conf, bool $isLoggedIn)
+    {
+        $this->conf = $conf;
+        $this->isLoggedIn = $isLoggedIn;
+    }
+
+    /**
+     * Convert a Bookmark into an array usable by templates and plugins.
+     *
+     * All Bookmark attributes are formatted through a format method
+     * that can be overridden in a formatter extending this class.
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return array formatted representation of a Bookmark
+     */
+    public function format($bookmark)
+    {
+        $out['id'] = $this->formatId($bookmark);
+        $out['shorturl'] = $this->formatShortUrl($bookmark);
+        $out['url'] = $this->formatUrl($bookmark);
+        $out['real_url'] = $this->formatRealUrl($bookmark);
+        $out['title'] = $this->formatTitle($bookmark);
+        $out['description'] = $this->formatDescription($bookmark);
+        $out['thumbnail'] = $this->formatThumbnail($bookmark);
+        $out['urlencoded_taglist'] = $this->formatUrlEncodedTagList($bookmark);
+        $out['taglist'] = $this->formatTagList($bookmark);
+        $out['urlencoded_tags'] = $this->formatUrlEncodedTagString($bookmark);
+        $out['tags'] = $this->formatTagString($bookmark);
+        $out['sticky'] = $bookmark->isSticky();
+        $out['private'] = $bookmark->isPrivate();
+        $out['class'] = $this->formatClass($bookmark);
+        $out['created'] = $this->formatCreated($bookmark);
+        $out['updated'] = $this->formatUpdated($bookmark);
+        $out['timestamp'] = $this->formatCreatedTimestamp($bookmark);
+        $out['updated_timestamp'] = $this->formatUpdatedTimestamp($bookmark);
+        return $out;
+    }
+
+    /**
+     * Add additional data available to formatters.
+     * This is used for example to add `index_url` in description's links.
+     *
+     * @param string $key   Context data key
+     * @param string $value Context data value
+     */
+    public function addContextData($key, $value)
+    {
+        $this->contextData[$key] = $value;
+
+        return $this;
+    }
+
+    /**
+     * Format ID
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return int formatted ID
+     */
+    protected function formatId($bookmark)
+    {
+        return $bookmark->getId();
+    }
+
+    /**
+     * Format ShortUrl
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted ShortUrl
+     */
+    protected function formatShortUrl($bookmark)
+    {
+        return $bookmark->getShortUrl();
+    }
+
+    /**
+     * Format Url
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Url
+     */
+    protected function formatUrl($bookmark)
+    {
+        return $bookmark->getUrl();
+    }
+
+    /**
+     * Format RealUrl
+     * Legacy: identical to Url
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted RealUrl
+     */
+    protected function formatRealUrl($bookmark)
+    {
+        return $this->formatUrl($bookmark);
+    }
+
+    /**
+     * Format Title
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Title
+     */
+    protected function formatTitle($bookmark)
+    {
+        return $bookmark->getTitle();
+    }
+
+    /**
+     * Format Description
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Description
+     */
+    protected function formatDescription($bookmark)
+    {
+        return $bookmark->getDescription();
+    }
+
+    /**
+     * Format Thumbnail
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Thumbnail
+     */
+    protected function formatThumbnail($bookmark)
+    {
+        return $bookmark->getThumbnail();
+    }
+
+    /**
+     * Format Tags
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return array formatted Tags
+     */
+    protected function formatTagList($bookmark)
+    {
+        return $this->filterTagList($bookmark->getTags());
+    }
+
+    /**
+     * Format Url Encoded Tags
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return array formatted Tags
+     */
+    protected function formatUrlEncodedTagList($bookmark)
+    {
+        return array_map('urlencode', $this->filterTagList($bookmark->getTags()));
+    }
+
+    /**
+     * Format TagString
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted TagString
+     */
+    protected function formatTagString($bookmark)
+    {
+        return implode(' ', $this->formatTagList($bookmark));
+    }
+
+    /**
+     * Format TagString
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted TagString
+     */
+    protected function formatUrlEncodedTagString($bookmark)
+    {
+        return implode(' ', $this->formatUrlEncodedTagList($bookmark));
+    }
+
+    /**
+     * Format Class
+     * Used to add specific CSS class for a link
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Class
+     */
+    protected function formatClass($bookmark)
+    {
+        return $bookmark->isPrivate() ? 'private' : '';
+    }
+
+    /**
+     * Format Created
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return DateTime instance
+     */
+    protected function formatCreated(Bookmark $bookmark)
+    {
+        return $bookmark->getCreated();
+    }
+
+    /**
+     * Format Updated
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return DateTime instance
+     */
+    protected function formatUpdated(Bookmark $bookmark)
+    {
+        return $bookmark->getUpdated();
+    }
+
+    /**
+     * Format CreatedTimestamp
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return int formatted CreatedTimestamp
+     */
+    protected function formatCreatedTimestamp(Bookmark $bookmark)
+    {
+        if (! empty($bookmark->getCreated())) {
+            return $bookmark->getCreated()->getTimestamp();
+        }
+        return 0;
+    }
+
+    /**
+     * Format UpdatedTimestamp
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return int formatted UpdatedTimestamp
+     */
+    protected function formatUpdatedTimestamp(Bookmark $bookmark)
+    {
+        if (! empty($bookmark->getUpdated())) {
+            return $bookmark->getUpdated()->getTimestamp();
+        }
+        return 0;
+    }
+
+    /**
+     * Format tag list, e.g. remove private tags if the user is not logged in.
+     *
+     * @param array $tags
+     *
+     * @return array
+     */
+    protected function filterTagList(array $tags): array
+    {
+        if ($this->isLoggedIn === true) {
+            return $tags;
+        }
+
+        $out = [];
+        foreach ($tags as $tag) {
+            if (strpos($tag, '.') === 0) {
+                continue;
+            }
+
+            $out[] = $tag;
+        }
+
+        return $out;
+    }
+}
diff --git a/application/formatter/BookmarkMarkdownFormatter.php b/application/formatter/BookmarkMarkdownFormatter.php
new file mode 100644
index 00000000..5d244d4c
--- /dev/null
+++ b/application/formatter/BookmarkMarkdownFormatter.php
@@ -0,0 +1,206 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+use Shaarli\Config\ConfigManager;
+
+/**
+ * Class BookmarkMarkdownFormatter
+ *
+ * Format bookmark description into Markdown format.
+ *
+ * @package Shaarli\Formatter
+ */
+class BookmarkMarkdownFormatter extends BookmarkDefaultFormatter
+{
+    /**
+     * When this tag is present in a bookmark, its description should not be processed with Markdown
+     */
+    const NO_MD_TAG = 'nomarkdown';
+
+    /** @var \Parsedown instance */
+    protected $parsedown;
+
+    /** @var bool used to escape HTML in Markdown or not.
+     *            It MUST be set to true for shared instance as HTML content can
+     *            introduce XSS vulnerabilities.
+     */
+    protected $escape;
+
+    /**
+     * @var array List of allowed protocols for links inside bookmark's description.
+     */
+    protected $allowedProtocols;
+
+    /**
+     * LinkMarkdownFormatter constructor.
+     *
+     * @param ConfigManager $conf instance
+     * @param bool          $isLoggedIn
+     */
+    public function __construct(ConfigManager $conf, bool $isLoggedIn)
+    {
+        parent::__construct($conf, $isLoggedIn);
+
+        $this->parsedown = new \Parsedown();
+        $this->escape = $conf->get('security.markdown_escape', true);
+        $this->allowedProtocols = $conf->get('security.allowed_protocols', []);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatDescription($bookmark)
+    {
+        if (in_array(self::NO_MD_TAG, $bookmark->getTags())) {
+            return parent::formatDescription($bookmark);
+        }
+
+        $processedDescription = $bookmark->getDescription();
+        $processedDescription = $this->filterProtocols($processedDescription);
+        $processedDescription = $this->formatHashTags($processedDescription);
+        $processedDescription = $this->reverseEscapedHtml($processedDescription);
+        $processedDescription = $this->parsedown
+            ->setMarkupEscaped($this->escape)
+            ->setBreaksEnabled(true)
+            ->text($processedDescription);
+        $processedDescription = $this->sanitizeHtml($processedDescription);
+
+        if (!empty($processedDescription)) {
+            $processedDescription = '<div class="markdown">'. $processedDescription . '</div>';
+        }
+
+        return $processedDescription;
+    }
+
+    /**
+     * Remove the NO markdown tag if it is present
+     *
+     * @inheritdoc
+     */
+    protected function formatTagList($bookmark)
+    {
+        $out = parent::formatTagList($bookmark);
+        if ($this->isLoggedIn === false && ($pos = array_search(self::NO_MD_TAG, $out)) !== false) {
+            unset($out[$pos]);
+            return array_values($out);
+        }
+        return $out;
+    }
+
+    /**
+     * Replace not whitelisted protocols with http:// in given description.
+     * Also adds `index_url` to relative links if it's specified
+     *
+     * @param string $description      input description text.
+     *
+     * @return string $description without malicious link.
+     */
+    protected function filterProtocols($description)
+    {
+        $allowedProtocols = $this->allowedProtocols;
+        $indexUrl = ! empty($this->contextData['index_url']) ? $this->contextData['index_url'] : '';
+
+        return preg_replace_callback(
+            '#]\((.*?)\)#is',
+            function ($match) use ($allowedProtocols, $indexUrl) {
+                $link = startsWith($match[1], '?') || startsWith($match[1], '/') ? $indexUrl : '';
+                $link .= whitelist_protocols($match[1], $allowedProtocols);
+                return ']('. $link.')';
+            },
+            $description
+        );
+    }
+
+    /**
+     * Replace hashtag in Markdown links format
+     * E.g. `#hashtag` becomes `[#hashtag](./add-tag/hashtag)`
+     * It includes the index URL if specified.
+     *
+     * @param string $description
+     *
+     * @return string
+     */
+    protected function formatHashTags($description)
+    {
+        $indexUrl = ! empty($this->contextData['index_url']) ? $this->contextData['index_url'] : '';
+
+        /*
+         * To support unicode: http://stackoverflow.com/a/35498078/1484919
+         * \p{Pc} - to match underscore
+         * \p{N} - numeric character in any script
+         * \p{L} - letter from any language
+         * \p{Mn} - any non marking space (accents, umlauts, etc)
+         */
+        $regex = '/(^|\s)#([\p{Pc}\p{N}\p{L}\p{Mn}]+)/mui';
+        $replacement = '$1[#$2]('. $indexUrl .'./add-tag/$2)';
+
+        $descriptionLines = explode(PHP_EOL, $description);
+        $descriptionOut = '';
+        $codeBlockOn = false;
+        $lineCount = 0;
+
+        foreach ($descriptionLines as $descriptionLine) {
+            // Detect line of code: starting with 4 spaces,
+            // except lists which can start with +/*/- or `2.` after spaces.
+            $codeLineOn = preg_match('/^    +(?=[^\+\*\-])(?=(?!\d\.).)/', $descriptionLine) > 0;
+            // Detect and toggle block of code
+            if (!$codeBlockOn) {
+                $codeBlockOn = preg_match('/^```/', $descriptionLine) > 0;
+            } elseif (preg_match('/^```/', $descriptionLine) > 0) {
+                $codeBlockOn = false;
+            }
+
+            if (!$codeBlockOn && !$codeLineOn) {
+                $descriptionLine = preg_replace($regex, $replacement, $descriptionLine);
+            }
+
+            $descriptionOut .= $descriptionLine;
+            if ($lineCount++ < count($descriptionLines) - 1) {
+                $descriptionOut .= PHP_EOL;
+            }
+        }
+
+        return $descriptionOut;
+    }
+
+    /**
+     * Remove dangerous HTML tags (tags, iframe, etc.).
+     * Doesn't affect <code> content (already escaped by Parsedown).
+     *
+     * @param string $description input description text.
+     *
+     * @return string given string escaped.
+     */
+    protected function sanitizeHtml($description)
+    {
+        $escapeTags = array(
+            'script',
+            'style',
+            'link',
+            'iframe',
+            'frameset',
+            'frame',
+        );
+        foreach ($escapeTags as $tag) {
+            $description = preg_replace_callback(
+                '#<\s*'. $tag .'[^>]*>(.*</\s*'. $tag .'[^>]*>)?#is',
+                function ($match) {
+                    return escape($match[0]);
+                },
+                $description
+            );
+        }
+        $description = preg_replace(
+            '#(<[^>]+\s)on[a-z]*="?[^ "]*"?#is',
+            '$1',
+            $description
+        );
+        return $description;
+    }
+
+    protected function reverseEscapedHtml($description)
+    {
+        return unescape($description);
+    }
+}
diff --git a/application/formatter/BookmarkRawFormatter.php b/application/formatter/BookmarkRawFormatter.php
new file mode 100644
index 00000000..bc372273
--- /dev/null
+++ b/application/formatter/BookmarkRawFormatter.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+/**
+ * Class BookmarkRawFormatter
+ *
+ * Used to retrieve bookmarks as array with raw values.
+ * Warning: Do NOT use this for HTML content as it can introduce XSS vulnerabilities.
+ *
+ * @package Shaarli\Formatter
+ */
+class BookmarkRawFormatter extends BookmarkFormatter {}
diff --git a/application/formatter/FormatterFactory.php b/application/formatter/FormatterFactory.php
new file mode 100644
index 00000000..a029579f
--- /dev/null
+++ b/application/formatter/FormatterFactory.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+use Shaarli\Config\ConfigManager;
+
+/**
+ * Class FormatterFactory
+ *
+ * Helper class used to instantiate the proper BookmarkFormatter.
+ *
+ * @package Shaarli\Formatter
+ */
+class FormatterFactory
+{
+    /** @var ConfigManager instance */
+    protected $conf;
+
+    /** @var bool */
+    protected $isLoggedIn;
+
+    /**
+     * FormatterFactory constructor.
+     *
+     * @param ConfigManager $conf
+     * @param bool          $isLoggedIn
+     */
+    public function __construct(ConfigManager $conf, bool $isLoggedIn)
+    {
+        $this->conf = $conf;
+        $this->isLoggedIn = $isLoggedIn;
+    }
+
+    /**
+     * Instanciate a BookmarkFormatter depending on the configuration or provided formatter type.
+     *
+     * @param string|null $type force a specific type regardless of the configuration
+     *
+     * @return BookmarkFormatter instance.
+     */
+    public function getFormatter(string $type = null): BookmarkFormatter
+    {
+        $type = $type ? $type : $this->conf->get('formatter', 'default');
+        $className = '\\Shaarli\\Formatter\\Bookmark'. ucfirst($type) .'Formatter';
+        if (!class_exists($className)) {
+            $className = '\\Shaarli\\Formatter\\BookmarkDefaultFormatter';
+        }
+
+        return new $className($this->conf, $this->isLoggedIn);
+    }
+}
diff --git a/application/front/ShaarliAdminMiddleware.php b/application/front/ShaarliAdminMiddleware.php
new file mode 100644
index 00000000..35ce4a3b
--- /dev/null
+++ b/application/front/ShaarliAdminMiddleware.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Shaarli\Front;
+
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Middleware used for controller requiring to be authenticated.
+ * It extends ShaarliMiddleware, and just make sure that the user is authenticated.
+ * Otherwise, it redirects to the login page.
+ */
+class ShaarliAdminMiddleware extends ShaarliMiddleware
+{
+    public function __invoke(Request $request, Response $response, callable $next): Response
+    {
+        $this->initBasePath($request);
+
+        if (true !== $this->container->loginManager->isLoggedIn()) {
+            $returnUrl = urlencode($this->container->environment['REQUEST_URI']);
+
+            return $response->withRedirect($this->container->basePath . '/login?returnurl=' . $returnUrl);
+        }
+
+        return parent::__invoke($request, $response, $next);
+    }
+}
diff --git a/application/front/ShaarliMiddleware.php b/application/front/ShaarliMiddleware.php
new file mode 100644
index 00000000..d1aa1399
--- /dev/null
+++ b/application/front/ShaarliMiddleware.php
@@ -0,0 +1,114 @@
+<?php
+
+namespace Shaarli\Front;
+
+use Shaarli\Container\ShaarliContainer;
+use Shaarli\Front\Exception\UnauthorizedException;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class ShaarliMiddleware
+ *
+ * This will be called before accessing any Shaarli controller.
+ */
+class ShaarliMiddleware
+{
+    /** @var ShaarliContainer contains all Shaarli DI */
+    protected $container;
+
+    public function __construct(ShaarliContainer $container)
+    {
+        $this->container = $container;
+    }
+
+    /**
+     * Middleware execution:
+     *   - run updates
+     *   - if not logged in open shaarli, redirect to login
+     *   - execute the controller
+     *   - return the response
+     *
+     * In case of error, the error template will be displayed with the exception message.
+     *
+     * @param  Request  $request  Slim request
+     * @param  Response $response Slim response
+     * @param  callable $next     Next action
+     *
+     * @return Response response.
+     */
+    public function __invoke(Request $request, Response $response, callable $next): Response
+    {
+        $this->initBasePath($request);
+
+        try {
+            if (!is_file($this->container->conf->getConfigFileExt())
+                && !in_array($next->getName(), ['displayInstall', 'saveInstall'], true)
+            ) {
+                return $response->withRedirect($this->container->basePath . '/install');
+            }
+
+            $this->runUpdates();
+            $this->checkOpenShaarli($request, $response, $next);
+
+            return $next($request, $response);
+        } catch (UnauthorizedException $e) {
+            $returnUrl = urlencode($this->container->environment['REQUEST_URI']);
+
+            return $response->withRedirect($this->container->basePath . '/login?returnurl=' . $returnUrl);
+        }
+        // Other exceptions are handled by ErrorController
+    }
+
+    /**
+     * Run the updater for every requests processed while logged in.
+     */
+    protected function runUpdates(): void
+    {
+        if ($this->container->loginManager->isLoggedIn() !== true) {
+            return;
+        }
+
+        $this->container->updater->setBasePath($this->container->basePath);
+        $newUpdates = $this->container->updater->update();
+        if (!empty($newUpdates)) {
+            $this->container->updater->writeUpdates(
+                $this->container->conf->get('resource.updates'),
+                $this->container->updater->getDoneUpdates()
+            );
+
+            $this->container->pageCacheManager->invalidateCaches();
+        }
+    }
+
+    /**
+     * Access is denied to most pages with `hide_public_links` + `force_login` settings.
+     */
+    protected function checkOpenShaarli(Request $request, Response $response, callable $next): bool
+    {
+        if (// if the user isn't logged in
+            !$this->container->loginManager->isLoggedIn()
+            // and Shaarli doesn't have public content...
+            && $this->container->conf->get('privacy.hide_public_links')
+            // and is configured to enforce the login
+            && $this->container->conf->get('privacy.force_login')
+            // and the current page isn't already the login page
+            // and the user is not requesting a feed (which would lead to a different content-type as expected)
+            && !in_array($next->getName(), ['login', 'processLogin', 'atom', 'rss'], true)
+        ) {
+            throw new UnauthorizedException();
+        }
+
+        return true;
+    }
+
+    /**
+     * Initialize the URL base path if it hasn't been defined yet.
+     */
+    protected function initBasePath(Request $request): void
+    {
+        if (null === $this->container->basePath) {
+            $this->container->basePath = rtrim($request->getUri()->getBasePath(), '/');
+        }
+    }
+}
diff --git a/application/front/controller/admin/ConfigureController.php b/application/front/controller/admin/ConfigureController.php
new file mode 100644
index 00000000..e675fcca
--- /dev/null
+++ b/application/front/controller/admin/ConfigureController.php
@@ -0,0 +1,126 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Languages;
+use Shaarli\Render\TemplatePage;
+use Shaarli\Render\ThemeUtils;
+use Shaarli\Thumbnailer;
+use Slim\Http\Request;
+use Slim\Http\Response;
+use Throwable;
+
+/**
+ * Class ConfigureController
+ *
+ * Slim controller used to handle Shaarli configuration page (display + save new config).
+ */
+class ConfigureController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/configure - Displays the configuration page
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $this->assignView('title', $this->container->conf->get('general.title', 'Shaarli'));
+        $this->assignView('theme', $this->container->conf->get('resource.theme'));
+        $this->assignView(
+            'theme_available',
+            ThemeUtils::getThemes($this->container->conf->get('resource.raintpl_tpl'))
+        );
+        $this->assignView('formatter_available', ['default', 'markdown']);
+        list($continents, $cities) = generateTimeZoneData(
+            timezone_identifiers_list(),
+            $this->container->conf->get('general.timezone')
+        );
+        $this->assignView('continents', $continents);
+        $this->assignView('cities', $cities);
+        $this->assignView('retrieve_description', $this->container->conf->get('general.retrieve_description', false));
+        $this->assignView('private_links_default', $this->container->conf->get('privacy.default_private_links', false));
+        $this->assignView(
+            'session_protection_disabled',
+            $this->container->conf->get('security.session_protection_disabled', false)
+        );
+        $this->assignView('enable_rss_permalinks', $this->container->conf->get('feed.rss_permalinks', false));
+        $this->assignView('enable_update_check', $this->container->conf->get('updates.check_updates', true));
+        $this->assignView('hide_public_links', $this->container->conf->get('privacy.hide_public_links', false));
+        $this->assignView('api_enabled', $this->container->conf->get('api.enabled', true));
+        $this->assignView('api_secret', $this->container->conf->get('api.secret'));
+        $this->assignView('languages', Languages::getAvailableLanguages());
+        $this->assignView('gd_enabled', extension_loaded('gd'));
+        $this->assignView('thumbnails_mode', $this->container->conf->get('thumbnails.mode', Thumbnailer::MODE_NONE));
+        $this->assignView('pagetitle', t('Configure') .' - '. $this->container->conf->get('general.title', 'Shaarli'));
+
+        return $response->write($this->render(TemplatePage::CONFIGURE));
+    }
+
+    /**
+     * POST /admin/configure - Update Shaarli's configuration
+     */
+    public function save(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        $continent = $request->getParam('continent');
+        $city = $request->getParam('city');
+        $tz = 'UTC';
+        if (null !== $continent && null !== $city && isTimeZoneValid($continent, $city)) {
+            $tz = $continent . '/' . $city;
+        }
+
+        $this->container->conf->set('general.timezone', $tz);
+        $this->container->conf->set('general.title', escape($request->getParam('title')));
+        $this->container->conf->set('general.header_link', escape($request->getParam('titleLink')));
+        $this->container->conf->set('general.retrieve_description', !empty($request->getParam('retrieveDescription')));
+        $this->container->conf->set('resource.theme', escape($request->getParam('theme')));
+        $this->container->conf->set(
+            'security.session_protection_disabled',
+            !empty($request->getParam('disablesessionprotection'))
+        );
+        $this->container->conf->set(
+            'privacy.default_private_links',
+            !empty($request->getParam('privateLinkByDefault'))
+        );
+        $this->container->conf->set('feed.rss_permalinks', !empty($request->getParam('enableRssPermalinks')));
+        $this->container->conf->set('updates.check_updates', !empty($request->getParam('updateCheck')));
+        $this->container->conf->set('privacy.hide_public_links', !empty($request->getParam('hidePublicLinks')));
+        $this->container->conf->set('api.enabled', !empty($request->getParam('enableApi')));
+        $this->container->conf->set('api.secret', escape($request->getParam('apiSecret')));
+        $this->container->conf->set('formatter', escape($request->getParam('formatter')));
+
+        if (!empty($request->getParam('language'))) {
+            $this->container->conf->set('translation.language', escape($request->getParam('language')));
+        }
+
+        $thumbnailsMode = extension_loaded('gd') ? $request->getParam('enableThumbnails') : Thumbnailer::MODE_NONE;
+        if ($thumbnailsMode !== Thumbnailer::MODE_NONE
+            && $thumbnailsMode !== $this->container->conf->get('thumbnails.mode', Thumbnailer::MODE_NONE)
+        ) {
+            $this->saveWarningMessage(
+                t('You have enabled or changed thumbnails mode.') .
+                '<a href="'. $this->container->basePath .'/admin/thumbnails">' . t('Please synchronize them.') .'</a>'
+            );
+        }
+        $this->container->conf->set('thumbnails.mode', $thumbnailsMode);
+
+        try {
+            $this->container->conf->write($this->container->loginManager->isLoggedIn());
+            $this->container->history->updateSettings();
+            $this->container->pageCacheManager->invalidateCaches();
+        } catch (Throwable $e) {
+            $this->assignView('message', t('Error while writing config file after configuration update.'));
+
+            if ($this->container->conf->get('dev.debug', false)) {
+                $this->assignView('stacktrace', $e->getMessage() . PHP_EOL . $e->getTraceAsString());
+            }
+
+            return $response->write($this->render('error'));
+        }
+
+        $this->saveSuccessMessage(t('Configuration was saved.'));
+
+        return $this->redirect($response, '/admin/configure');
+    }
+}
diff --git a/application/front/controller/admin/ExportController.php b/application/front/controller/admin/ExportController.php
new file mode 100644
index 00000000..2be957fa
--- /dev/null
+++ b/application/front/controller/admin/ExportController.php
@@ -0,0 +1,80 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use DateTime;
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class ExportController
+ *
+ * Slim controller used to display Shaarli data export page,
+ * and process the bookmarks export as a Netscape Bookmarks file.
+ */
+class ExportController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/export - Display export page
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $this->assignView('pagetitle', t('Export') .' - '. $this->container->conf->get('general.title', 'Shaarli'));
+
+        return $response->write($this->render(TemplatePage::EXPORT));
+    }
+
+    /**
+     * POST /admin/export - Process export, and serve download file named
+     *                      bookmarks_(all|private|public)_datetime.html
+     */
+    public function export(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        $selection = $request->getParam('selection');
+
+        if (empty($selection)) {
+            $this->saveErrorMessage(t('Please select an export mode.'));
+
+            return $this->redirect($response, '/admin/export');
+        }
+
+        $prependNoteUrl = filter_var($request->getParam('prepend_note_url') ?? false, FILTER_VALIDATE_BOOLEAN);
+
+        try {
+            $formatter = $this->container->formatterFactory->getFormatter('raw');
+
+            $this->assignView(
+                'links',
+                $this->container->netscapeBookmarkUtils->filterAndFormat(
+                    $formatter,
+                    $selection,
+                    $prependNoteUrl,
+                    index_url($this->container->environment)
+                )
+            );
+        } catch (\Exception $exc) {
+            $this->saveErrorMessage($exc->getMessage());
+
+            return $this->redirect($response, '/admin/export');
+        }
+
+        $now = new DateTime();
+        $response = $response->withHeader('Content-Type', 'text/html; charset=utf-8');
+        $response = $response->withHeader(
+            'Content-disposition',
+            'attachment; filename=bookmarks_'.$selection.'_'.$now->format(Bookmark::LINK_DATE_FORMAT).'.html'
+        );
+
+        $this->assignView('date', $now->format(DateTime::RFC822));
+        $this->assignView('eol', PHP_EOL);
+        $this->assignView('selection', $selection);
+
+        return $response->write($this->render(TemplatePage::NETSCAPE_EXPORT_BOOKMARKS));
+    }
+}
diff --git a/application/front/controller/admin/ImportController.php b/application/front/controller/admin/ImportController.php
new file mode 100644
index 00000000..758d5ef9
--- /dev/null
+++ b/application/front/controller/admin/ImportController.php
@@ -0,0 +1,82 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Psr\Http\Message\UploadedFileInterface;
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class ImportController
+ *
+ * Slim controller used to display Shaarli data import page,
+ * and import bookmarks from Netscape Bookmarks file.
+ */
+class ImportController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/import - Display import page
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $this->assignView(
+            'maxfilesize',
+            get_max_upload_size(
+                ini_get('post_max_size'),
+                ini_get('upload_max_filesize'),
+                false
+            )
+        );
+        $this->assignView(
+            'maxfilesizeHuman',
+            get_max_upload_size(
+                ini_get('post_max_size'),
+                ini_get('upload_max_filesize'),
+                true
+            )
+        );
+        $this->assignView('pagetitle', t('Import') .' - '. $this->container->conf->get('general.title', 'Shaarli'));
+
+        return $response->write($this->render(TemplatePage::IMPORT));
+    }
+
+    /**
+     * POST /admin/import - Process import file provided and create bookmarks
+     */
+    public function import(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        $file = ($request->getUploadedFiles() ?? [])['filetoupload'] ?? null;
+        if (!$file instanceof UploadedFileInterface) {
+            $this->saveErrorMessage(t('No import file provided.'));
+
+            return $this->redirect($response, '/admin/import');
+        }
+
+
+        // Import bookmarks from an uploaded file
+        if (0 === $file->getSize()) {
+            // The file is too big or some form field may be missing.
+            $msg = sprintf(
+                t(
+                    'The file you are trying to upload is probably bigger than what this webserver can accept'
+                    .' (%s). Please upload in smaller chunks.'
+                ),
+                get_max_upload_size(ini_get('post_max_size'), ini_get('upload_max_filesize'))
+            );
+            $this->saveErrorMessage($msg);
+
+            return $this->redirect($response, '/admin/import');
+        }
+
+        $status = $this->container->netscapeBookmarkUtils->import($request->getParams(), $file);
+
+        $this->saveSuccessMessage($status);
+
+        return $this->redirect($response, '/admin/import');
+    }
+}
diff --git a/application/front/controller/admin/LogoutController.php b/application/front/controller/admin/LogoutController.php
new file mode 100644
index 00000000..28165129
--- /dev/null
+++ b/application/front/controller/admin/LogoutController.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Security\CookieManager;
+use Shaarli\Security\LoginManager;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class LogoutController
+ *
+ * Slim controller used to logout the user.
+ * It invalidates page cache and terminate the user session. Then it redirects to the homepage.
+ */
+class LogoutController extends ShaarliAdminController
+{
+    public function index(Request $request, Response $response): Response
+    {
+        $this->container->pageCacheManager->invalidateCaches();
+        $this->container->sessionManager->logout();
+        $this->container->cookieManager->setCookieParameter(
+            CookieManager::STAY_SIGNED_IN,
+            'false',
+            0,
+            $this->container->basePath . '/'
+        );
+
+        return $this->redirect($response, '/');
+    }
+}
diff --git a/application/front/controller/admin/ManageShaareController.php b/application/front/controller/admin/ManageShaareController.php
new file mode 100644
index 00000000..bb083486
--- /dev/null
+++ b/application/front/controller/admin/ManageShaareController.php
@@ -0,0 +1,371 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
+use Shaarli\Formatter\BookmarkMarkdownFormatter;
+use Shaarli\Render\TemplatePage;
+use Shaarli\Thumbnailer;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class PostBookmarkController
+ *
+ * Slim controller used to handle Shaarli create or edit bookmarks.
+ */
+class ManageShaareController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/add-shaare - Displays the form used to create a new bookmark from an URL
+     */
+    public function addShaare(Request $request, Response $response): Response
+    {
+        $this->assignView(
+            'pagetitle',
+            t('Shaare a new link') .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+
+        return $response->write($this->render(TemplatePage::ADDLINK));
+    }
+
+    /**
+     * GET /admin/shaare - Displays the bookmark form for creation.
+     *                     Note that if the URL is found in existing bookmarks, then it will be in edit mode.
+     */
+    public function displayCreateForm(Request $request, Response $response): Response
+    {
+        $url = cleanup_url($request->getParam('post'));
+
+        $linkIsNew = false;
+        // Check if URL is not already in database (in this case, we will edit the existing link)
+        $bookmark = $this->container->bookmarkService->findByUrl($url);
+        if (null === $bookmark) {
+            $linkIsNew = true;
+            // Get shaare data if it was provided in URL (e.g.: by the bookmarklet).
+            $title = $request->getParam('title');
+            $description = $request->getParam('description');
+            $tags = $request->getParam('tags');
+            $private = filter_var($request->getParam('private'), FILTER_VALIDATE_BOOLEAN);
+
+            // If this is an HTTP(S) link, we try go get the page to extract
+            // the title (otherwise we will to straight to the edit form.)
+            if (empty($title) && strpos(get_url_scheme($url) ?: '', 'http') !== false) {
+                $retrieveDescription = $this->container->conf->get('general.retrieve_description');
+                // Short timeout to keep the application responsive
+                // The callback will fill $charset and $title with data from the downloaded page.
+                $this->container->httpAccess->getHttpResponse(
+                    $url,
+                    $this->container->conf->get('general.download_timeout', 30),
+                    $this->container->conf->get('general.download_max_size', 4194304),
+                    $this->container->httpAccess->getCurlDownloadCallback(
+                        $charset,
+                        $title,
+                        $description,
+                        $tags,
+                        $retrieveDescription
+                    )
+                );
+                if (! empty($title) && strtolower($charset) !== 'utf-8' && mb_check_encoding($charset)) {
+                    $title = mb_convert_encoding($title, 'utf-8', $charset);
+                }
+            }
+
+            if (empty($url) && empty($title)) {
+                $title = $this->container->conf->get('general.default_note_title', t('Note: '));
+            }
+
+            $link = [
+                'title' => $title,
+                'url' => $url ?? '',
+                'description' => $description ?? '',
+                'tags' => $tags ?? '',
+                'private' => $private,
+            ];
+        } else {
+            $formatter = $this->container->formatterFactory->getFormatter('raw');
+            $link = $formatter->format($bookmark);
+        }
+
+        return $this->displayForm($link, $linkIsNew, $request, $response);
+    }
+
+    /**
+     * GET /admin/shaare/{id} - Displays the bookmark form in edition mode.
+     */
+    public function displayEditForm(Request $request, Response $response, array $args): Response
+    {
+        $id = $args['id'] ?? '';
+        try {
+            if (false === ctype_digit($id)) {
+                throw new BookmarkNotFoundException();
+            }
+            $bookmark = $this->container->bookmarkService->get((int) $id);  // Read database
+        } catch (BookmarkNotFoundException $e) {
+            $this->saveErrorMessage(sprintf(
+                t('Bookmark with identifier %s could not be found.'),
+                $id
+            ));
+
+            return $this->redirect($response, '/');
+        }
+
+        $formatter = $this->container->formatterFactory->getFormatter('raw');
+        $link = $formatter->format($bookmark);
+
+        return $this->displayForm($link, false, $request, $response);
+    }
+
+    /**
+     * POST /admin/shaare
+     */
+    public function save(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        // lf_id should only be present if the link exists.
+        $id = $request->getParam('lf_id') !== null ? intval(escape($request->getParam('lf_id'))) : null;
+        if (null !== $id && true === $this->container->bookmarkService->exists($id)) {
+            // Edit
+            $bookmark = $this->container->bookmarkService->get($id);
+        } else {
+            // New link
+            $bookmark = new Bookmark();
+        }
+
+        $bookmark->setTitle($request->getParam('lf_title'));
+        $bookmark->setDescription($request->getParam('lf_description'));
+        $bookmark->setUrl($request->getParam('lf_url'), $this->container->conf->get('security.allowed_protocols', []));
+        $bookmark->setPrivate(filter_var($request->getParam('lf_private'), FILTER_VALIDATE_BOOLEAN));
+        $bookmark->setTagsString($request->getParam('lf_tags'));
+
+        if ($this->container->conf->get('thumbnails.mode', Thumbnailer::MODE_NONE) !== Thumbnailer::MODE_NONE
+            && false === $bookmark->isNote()
+        ) {
+            $bookmark->setThumbnail($this->container->thumbnailer->get($bookmark->getUrl()));
+        }
+        $this->container->bookmarkService->addOrSet($bookmark, false);
+
+        // To preserve backward compatibility with 3rd parties, plugins still use arrays
+        $formatter = $this->container->formatterFactory->getFormatter('raw');
+        $data = $formatter->format($bookmark);
+        $this->executePageHooks('save_link', $data);
+
+        $bookmark->fromArray($data);
+        $this->container->bookmarkService->set($bookmark);
+
+        // If we are called from the bookmarklet, we must close the popup:
+        if ($request->getParam('source') === 'bookmarklet') {
+            return $response->write('<script>self.close();</script>');
+        }
+
+        if (!empty($request->getParam('returnurl'))) {
+            $this->container->environment['HTTP_REFERER'] = escape($request->getParam('returnurl'));
+        }
+
+        return $this->redirectFromReferer(
+            $request,
+            $response,
+            ['/admin/add-shaare', '/admin/shaare'], ['addlink', 'post', 'edit_link'],
+            $bookmark->getShortUrl()
+        );
+    }
+
+    /**
+     * GET /admin/shaare/delete - Delete one or multiple bookmarks (depending on `id` query parameter).
+     */
+    public function deleteBookmark(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        $ids = escape(trim($request->getParam('id') ?? ''));
+        if (empty($ids) || strpos($ids, ' ') !== false) {
+            // multiple, space-separated ids provided
+            $ids = array_values(array_filter(preg_split('/\s+/', $ids), 'ctype_digit'));
+        } else {
+            $ids = [$ids];
+        }
+
+        // assert at least one id is given
+        if (0 === count($ids)) {
+            $this->saveErrorMessage(t('Invalid bookmark ID provided.'));
+
+            return $this->redirectFromReferer($request, $response, [], ['delete-shaare']);
+        }
+
+        $formatter = $this->container->formatterFactory->getFormatter('raw');
+        $count = 0;
+        foreach ($ids as $id) {
+            try {
+                $bookmark = $this->container->bookmarkService->get((int) $id);
+            } catch (BookmarkNotFoundException $e) {
+                $this->saveErrorMessage(sprintf(
+                    t('Bookmark with identifier %s could not be found.'),
+                    $id
+                ));
+
+                continue;
+            }
+
+            $data = $formatter->format($bookmark);
+            $this->executePageHooks('delete_link', $data);
+            $this->container->bookmarkService->remove($bookmark, false);
+            ++ $count;
+        }
+
+        if ($count > 0) {
+            $this->container->bookmarkService->save();
+        }
+
+        // If we are called from the bookmarklet, we must close the popup:
+        if ($request->getParam('source') === 'bookmarklet') {
+            return $response->write('<script>self.close();</script>');
+        }
+
+        // Don't redirect to where we were previously because the datastore has changed.
+        return $this->redirect($response, '/');
+    }
+
+    /**
+     * GET /admin/shaare/visibility
+     *
+     * Change visibility (public/private) of one or multiple bookmarks (depending on `id` query parameter).
+     */
+    public function changeVisibility(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        $ids = trim(escape($request->getParam('id') ?? ''));
+        if (empty($ids) || strpos($ids, ' ') !== false) {
+            // multiple, space-separated ids provided
+            $ids = array_values(array_filter(preg_split('/\s+/', $ids), 'ctype_digit'));
+        } else {
+            // only a single id provided
+            $ids = [$ids];
+        }
+
+        // assert at least one id is given
+        if (0 === count($ids)) {
+            $this->saveErrorMessage(t('Invalid bookmark ID provided.'));
+
+            return $this->redirectFromReferer($request, $response, [], ['change_visibility']);
+        }
+
+        // assert that the visibility is valid
+        $visibility = $request->getParam('newVisibility');
+        if (null === $visibility || false === in_array($visibility, ['public', 'private'], true)) {
+            $this->saveErrorMessage(t('Invalid visibility provided.'));
+
+            return $this->redirectFromReferer($request, $response, [], ['change_visibility']);
+        } else {
+            $isPrivate = $visibility === 'private';
+        }
+
+        $formatter = $this->container->formatterFactory->getFormatter('raw');
+        $count = 0;
+
+        foreach ($ids as $id) {
+            try {
+                $bookmark = $this->container->bookmarkService->get((int) $id);
+            } catch (BookmarkNotFoundException $e) {
+                $this->saveErrorMessage(sprintf(
+                    t('Bookmark with identifier %s could not be found.'),
+                    $id
+                ));
+
+                continue;
+            }
+
+            $bookmark->setPrivate($isPrivate);
+
+            // To preserve backward compatibility with 3rd parties, plugins still use arrays
+            $data = $formatter->format($bookmark);
+            $this->executePageHooks('save_link', $data);
+            $bookmark->fromArray($data);
+
+            $this->container->bookmarkService->set($bookmark, false);
+            ++$count;
+        }
+
+        if ($count > 0) {
+            $this->container->bookmarkService->save();
+        }
+
+        return $this->redirectFromReferer($request, $response, ['/visibility'], ['change_visibility']);
+    }
+
+    /**
+     * GET /admin/shaare/{id}/pin - Pin or unpin a bookmark.
+     */
+    public function pinBookmark(Request $request, Response $response, array $args): Response
+    {
+        $this->checkToken($request);
+
+        $id = $args['id'] ?? '';
+        try {
+            if (false === ctype_digit($id)) {
+                throw new BookmarkNotFoundException();
+            }
+            $bookmark = $this->container->bookmarkService->get((int) $id);  // Read database
+        } catch (BookmarkNotFoundException $e) {
+            $this->saveErrorMessage(sprintf(
+                t('Bookmark with identifier %s could not be found.'),
+                $id
+            ));
+
+            return $this->redirectFromReferer($request, $response, ['/pin'], ['pin']);
+        }
+
+        $formatter = $this->container->formatterFactory->getFormatter('raw');
+
+        $bookmark->setSticky(!$bookmark->isSticky());
+
+        // To preserve backward compatibility with 3rd parties, plugins still use arrays
+        $data = $formatter->format($bookmark);
+        $this->executePageHooks('save_link', $data);
+        $bookmark->fromArray($data);
+
+        $this->container->bookmarkService->set($bookmark);
+
+        return $this->redirectFromReferer($request, $response, ['/pin'], ['pin']);
+    }
+
+    /**
+     * Helper function used to display the shaare form whether it's a new or existing bookmark.
+     *
+     * @param array $link data used in template, either from parameters or from the data store
+     */
+    protected function displayForm(array $link, bool $isNew, Request $request, Response $response): Response
+    {
+        $tags = $this->container->bookmarkService->bookmarksCountPerTag();
+        if ($this->container->conf->get('formatter') === 'markdown') {
+            $tags[BookmarkMarkdownFormatter::NO_MD_TAG] = 1;
+        }
+
+        $data = escape([
+            'link' => $link,
+            'link_is_new' => $isNew,
+            'http_referer' => $this->container->environment['HTTP_REFERER'] ?? '',
+            'source' => $request->getParam('source') ?? '',
+            'tags' => $tags,
+            'default_private_links' => $this->container->conf->get('privacy.default_private_links', false),
+        ]);
+
+        $this->executePageHooks('render_editlink', $data, TemplatePage::EDIT_LINK);
+
+        foreach ($data as $key => $value) {
+            $this->assignView($key, $value);
+        }
+
+        $editLabel = false === $isNew ? t('Edit') .' ' : '';
+        $this->assignView(
+            'pagetitle',
+            $editLabel . t('Shaare') .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+
+        return $response->write($this->render(TemplatePage::EDIT_LINK));
+    }
+}
diff --git a/application/front/controller/admin/ManageTagController.php b/application/front/controller/admin/ManageTagController.php
new file mode 100644
index 00000000..2065c3e2
--- /dev/null
+++ b/application/front/controller/admin/ManageTagController.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Bookmark\BookmarkFilter;
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class ManageTagController
+ *
+ * Slim controller used to handle Shaarli manage tags page (rename and delete tags).
+ */
+class ManageTagController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/tags - Displays the manage tags page
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $fromTag = $request->getParam('fromtag') ?? '';
+
+        $this->assignView('fromtag', escape($fromTag));
+        $this->assignView(
+            'pagetitle',
+            t('Manage tags') .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+
+        return $response->write($this->render(TemplatePage::CHANGE_TAG));
+    }
+
+    /**
+     * POST /admin/tags - Update or delete provided tag
+     */
+    public function save(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        $isDelete = null !== $request->getParam('deletetag') && null === $request->getParam('renametag');
+
+        $fromTag = trim($request->getParam('fromtag') ?? '');
+        $toTag = trim($request->getParam('totag') ?? '');
+
+        if (0 === strlen($fromTag) || false === $isDelete && 0 === strlen($toTag)) {
+            $this->saveWarningMessage(t('Invalid tags provided.'));
+
+            return $this->redirect($response, '/admin/tags');
+        }
+
+        // TODO: move this to bookmark service
+        $count = 0;
+        $bookmarks = $this->container->bookmarkService->search(['searchtags' => $fromTag], BookmarkFilter::$ALL, true);
+        foreach ($bookmarks as $bookmark) {
+            if (false === $isDelete) {
+                $bookmark->renameTag($fromTag, $toTag);
+            } else {
+                $bookmark->deleteTag($fromTag);
+            }
+
+            $this->container->bookmarkService->set($bookmark, false);
+            $this->container->history->updateLink($bookmark);
+            $count++;
+        }
+
+        $this->container->bookmarkService->save();
+
+        if (true === $isDelete) {
+            $alert = sprintf(
+                t('The tag was removed from %d bookmark.', 'The tag was removed from %d bookmarks.', $count),
+                $count
+            );
+        } else {
+            $alert = sprintf(
+                t('The tag was renamed in %d bookmark.', 'The tag was renamed in %d bookmarks.', $count),
+                $count
+            );
+        }
+
+        $this->saveSuccessMessage($alert);
+
+        $redirect = true === $isDelete ? '/admin/tags' : '/?searchtags='. urlencode($toTag);
+
+        return $this->redirect($response, $redirect);
+    }
+}
diff --git a/application/front/controller/admin/PasswordController.php b/application/front/controller/admin/PasswordController.php
new file mode 100644
index 00000000..5ec0d24b
--- /dev/null
+++ b/application/front/controller/admin/PasswordController.php
@@ -0,0 +1,101 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Container\ShaarliContainer;
+use Shaarli\Front\Exception\OpenShaarliPasswordException;
+use Shaarli\Front\Exception\ShaarliFrontException;
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+use Throwable;
+
+/**
+ * Class PasswordController
+ *
+ * Slim controller used to handle passwords update.
+ */
+class PasswordController extends ShaarliAdminController
+{
+    public function __construct(ShaarliContainer $container)
+    {
+        parent::__construct($container);
+
+        $this->assignView(
+            'pagetitle',
+            t('Change password') .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+    }
+
+    /**
+     * GET /admin/password - Displays the change password template
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        return $response->write($this->render(TemplatePage::CHANGE_PASSWORD));
+    }
+
+    /**
+     * POST /admin/password - Change admin password - existing and new passwords need to be provided.
+     */
+    public function change(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        if ($this->container->conf->get('security.open_shaarli', false)) {
+            throw new OpenShaarliPasswordException();
+        }
+
+        $oldPassword = $request->getParam('oldpassword');
+        $newPassword = $request->getParam('setpassword');
+
+        if (empty($newPassword) || empty($oldPassword)) {
+            $this->saveErrorMessage(t('You must provide the current and new password to change it.'));
+
+            return $response
+                ->withStatus(400)
+                ->write($this->render(TemplatePage::CHANGE_PASSWORD))
+            ;
+        }
+
+        // Make sure old password is correct.
+        $oldHash = sha1(
+            $oldPassword .
+            $this->container->conf->get('credentials.login') .
+            $this->container->conf->get('credentials.salt')
+        );
+
+        if ($oldHash !== $this->container->conf->get('credentials.hash')) {
+            $this->saveErrorMessage(t('The old password is not correct.'));
+
+            return $response
+                ->withStatus(400)
+                ->write($this->render(TemplatePage::CHANGE_PASSWORD))
+            ;
+        }
+
+        // Save new password
+        // Salt renders rainbow-tables attacks useless.
+        $this->container->conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
+        $this->container->conf->set(
+            'credentials.hash',
+            sha1(
+                $newPassword
+                . $this->container->conf->get('credentials.login')
+                . $this->container->conf->get('credentials.salt')
+            )
+        );
+
+        try {
+            $this->container->conf->write($this->container->loginManager->isLoggedIn());
+        } catch (Throwable $e) {
+            throw new ShaarliFrontException($e->getMessage(), 500, $e);
+        }
+
+        $this->saveSuccessMessage(t('Your password has been changed'));
+
+        return $response->write($this->render(TemplatePage::CHANGE_PASSWORD));
+    }
+}
diff --git a/application/front/controller/admin/PluginsController.php b/application/front/controller/admin/PluginsController.php
new file mode 100644
index 00000000..8e059681
--- /dev/null
+++ b/application/front/controller/admin/PluginsController.php
@@ -0,0 +1,85 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Exception;
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class PluginsController
+ *
+ * Slim controller used to handle Shaarli plugins configuration page (display + save new config).
+ */
+class PluginsController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/plugins - Displays the configuration page
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $pluginMeta = $this->container->pluginManager->getPluginsMeta();
+
+        // Split plugins into 2 arrays: ordered enabled plugins and disabled.
+        $enabledPlugins = array_filter($pluginMeta, function ($v) {
+            return ($v['order'] ?? false) !== false;
+        });
+        $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $this->container->conf->get('plugins', []));
+        uasort(
+            $enabledPlugins,
+            function ($a, $b) {
+                return $a['order'] - $b['order'];
+            }
+        );
+        $disabledPlugins = array_filter($pluginMeta, function ($v) {
+            return ($v['order'] ?? false) === false;
+        });
+
+        $this->assignView('enabledPlugins', $enabledPlugins);
+        $this->assignView('disabledPlugins', $disabledPlugins);
+        $this->assignView(
+            'pagetitle',
+            t('Plugin Administration') .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+
+        return $response->write($this->render(TemplatePage::PLUGINS_ADMIN));
+    }
+
+    /**
+     * POST /admin/plugins - Update Shaarli's configuration
+     */
+    public function save(Request $request, Response $response): Response
+    {
+        $this->checkToken($request);
+
+        try {
+            $parameters = $request->getParams() ?? [];
+
+            $this->executePageHooks('save_plugin_parameters', $parameters);
+
+            if (isset($parameters['parameters_form'])) {
+                unset($parameters['parameters_form']);
+                unset($parameters['token']);
+                foreach ($parameters as $param => $value) {
+                    $this->container->conf->set('plugins.'. $param, escape($value));
+                }
+            } else {
+                $this->container->conf->set('general.enabled_plugins', save_plugin_config($parameters));
+            }
+
+            $this->container->conf->write($this->container->loginManager->isLoggedIn());
+            $this->container->history->updateSettings();
+
+            $this->saveSuccessMessage(t('Setting successfully saved.'));
+        } catch (Exception $e) {
+            $this->saveErrorMessage(
+                t('Error while saving plugin configuration: ') . PHP_EOL . $e->getMessage()
+            );
+        }
+
+        return $this->redirect($response, '/admin/plugins');
+    }
+}
diff --git a/application/front/controller/admin/SessionFilterController.php b/application/front/controller/admin/SessionFilterController.php
new file mode 100644
index 00000000..d9a7a2e0
--- /dev/null
+++ b/application/front/controller/admin/SessionFilterController.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Bookmark\BookmarkFilter;
+use Shaarli\Security\SessionManager;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class SessionFilterController
+ *
+ * Slim controller used to handle filters stored in the user session, such as visibility, etc.
+ */
+class SessionFilterController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/visibility: allows to display only public or only private bookmarks in linklist
+     */
+    public function visibility(Request $request, Response $response, array $args): Response
+    {
+        if (false === $this->container->loginManager->isLoggedIn()) {
+            return $this->redirectFromReferer($request, $response, ['visibility']);
+        }
+
+        $newVisibility = $args['visibility'] ?? null;
+        if (false === in_array($newVisibility, [BookmarkFilter::$PRIVATE, BookmarkFilter::$PUBLIC], true)) {
+            $newVisibility = null;
+        }
+
+        $currentVisibility = $this->container->sessionManager->getSessionParameter(SessionManager::KEY_VISIBILITY);
+
+        // Visibility not set or not already expected value, set expected value, otherwise reset it
+        if ($newVisibility !== null && (null === $currentVisibility || $currentVisibility !== $newVisibility)) {
+            // See only public bookmarks
+            $this->container->sessionManager->setSessionParameter(
+                SessionManager::KEY_VISIBILITY,
+                $newVisibility
+            );
+        } else {
+            $this->container->sessionManager->deleteSessionParameter(SessionManager::KEY_VISIBILITY);
+        }
+
+        return $this->redirectFromReferer($request, $response, ['visibility']);
+    }
+
+
+}
diff --git a/application/front/controller/admin/ShaarliAdminController.php b/application/front/controller/admin/ShaarliAdminController.php
new file mode 100644
index 00000000..c26c9cbe
--- /dev/null
+++ b/application/front/controller/admin/ShaarliAdminController.php
@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Front\Controller\Visitor\ShaarliVisitorController;
+use Shaarli\Front\Exception\WrongTokenException;
+use Shaarli\Security\SessionManager;
+use Slim\Http\Request;
+
+/**
+ * Class ShaarliAdminController
+ *
+ * All admin controllers (for logged in users) MUST extend this abstract class.
+ * It makes sure that the user is properly logged in, and otherwise throw an exception
+ * which will redirect to the login page.
+ *
+ * @package Shaarli\Front\Controller\Admin
+ */
+abstract class ShaarliAdminController extends ShaarliVisitorController
+{
+    /**
+     * Any persistent action to the config or data store must check the XSRF token validity.
+     */
+    protected function checkToken(Request $request): bool
+    {
+        if (!$this->container->sessionManager->checkToken($request->getParam('token'))) {
+            throw new WrongTokenException();
+        }
+
+        return true;
+    }
+
+    /**
+     * Save a SUCCESS message in user session, which will be displayed on any template page.
+     */
+    protected function saveSuccessMessage(string $message): void
+    {
+        $this->saveMessage(SessionManager::KEY_SUCCESS_MESSAGES, $message);
+    }
+
+    /**
+     * Save a WARNING message in user session, which will be displayed on any template page.
+     */
+    protected function saveWarningMessage(string $message): void
+    {
+        $this->saveMessage(SessionManager::KEY_WARNING_MESSAGES, $message);
+    }
+
+    /**
+     * Save an ERROR message in user session, which will be displayed on any template page.
+     */
+    protected function saveErrorMessage(string $message): void
+    {
+        $this->saveMessage(SessionManager::KEY_ERROR_MESSAGES, $message);
+    }
+
+    /**
+     * Use the sessionManager to save the provided message using the proper type.
+     *
+     * @param string $type successed/warnings/errors
+     */
+    protected function saveMessage(string $type, string $message): void
+    {
+        $messages = $this->container->sessionManager->getSessionParameter($type) ?? [];
+        $messages[] = $message;
+
+        $this->container->sessionManager->setSessionParameter($type, $messages);
+    }
+}
diff --git a/application/front/controller/admin/ThumbnailsController.php b/application/front/controller/admin/ThumbnailsController.php
new file mode 100644
index 00000000..81c87ed0
--- /dev/null
+++ b/application/front/controller/admin/ThumbnailsController.php
@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class ToolsController
+ *
+ * Slim controller used to handle thumbnails update.
+ */
+class ThumbnailsController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/thumbnails - Display thumbnails update page
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $ids = [];
+        foreach ($this->container->bookmarkService->search() as $bookmark) {
+            // A note or not HTTP(S)
+            if ($bookmark->isNote() || !startsWith(strtolower($bookmark->getUrl()), 'http')) {
+                continue;
+            }
+
+            $ids[] = $bookmark->getId();
+        }
+
+        $this->assignView('ids', $ids);
+        $this->assignView(
+            'pagetitle',
+            t('Thumbnails update') .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+
+        return $response->write($this->render(TemplatePage::THUMBNAILS));
+    }
+
+    /**
+     * PATCH /admin/shaare/{id}/thumbnail-update - Route for AJAX calls
+     */
+    public function ajaxUpdate(Request $request, Response $response, array $args): Response
+    {
+        $id = $args['id'] ?? null;
+
+        if (false === ctype_digit($id)) {
+            return $response->withStatus(400);
+        }
+
+        try {
+            $bookmark = $this->container->bookmarkService->get($id);
+        } catch (BookmarkNotFoundException $e) {
+            return $response->withStatus(404);
+        }
+
+        $bookmark->setThumbnail($this->container->thumbnailer->get($bookmark->getUrl()));
+        $this->container->bookmarkService->set($bookmark);
+
+        return $response->withJson($this->container->formatterFactory->getFormatter('raw')->format($bookmark));
+    }
+}
diff --git a/application/front/controller/admin/TokenController.php b/application/front/controller/admin/TokenController.php
new file mode 100644
index 00000000..08d68d0a
--- /dev/null
+++ b/application/front/controller/admin/TokenController.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class TokenController
+ *
+ * Endpoint used to retrieve a XSRF token. Useful for AJAX requests.
+ */
+class TokenController extends ShaarliAdminController
+{
+    /**
+     * GET /admin/token
+     */
+    public function getToken(Request $request, Response $response): Response
+    {
+        $response = $response->withHeader('Content-Type', 'text/plain');
+
+        return $response->write($this->container->sessionManager->generateToken());
+    }
+}
diff --git a/application/front/controller/admin/ToolsController.php b/application/front/controller/admin/ToolsController.php
new file mode 100644
index 00000000..a87f20d2
--- /dev/null
+++ b/application/front/controller/admin/ToolsController.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin;
+
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class ToolsController
+ *
+ * Slim controller used to display the tools page.
+ */
+class ToolsController extends ShaarliAdminController
+{
+    public function index(Request $request, Response $response): Response
+    {
+        $data = [
+            'pageabsaddr' => index_url($this->container->environment),
+            'sslenabled' => is_https($this->container->environment),
+        ];
+
+        $this->executePageHooks('render_tools', $data, TemplatePage::TOOLS);
+
+        foreach ($data as $key => $value) {
+            $this->assignView($key, $value);
+        }
+
+        $this->assignView('pagetitle', t('Tools') .' - '. $this->container->conf->get('general.title', 'Shaarli'));
+
+        return $response->write($this->render(TemplatePage::TOOLS));
+    }
+}
diff --git a/application/front/controller/visitor/BookmarkListController.php b/application/front/controller/visitor/BookmarkListController.php
new file mode 100644
index 00000000..18368751
--- /dev/null
+++ b/application/front/controller/visitor/BookmarkListController.php
@@ -0,0 +1,241 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
+use Shaarli\Legacy\LegacyController;
+use Shaarli\Legacy\UnknowLegacyRouteException;
+use Shaarli\Render\TemplatePage;
+use Shaarli\Thumbnailer;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class BookmarkListController
+ *
+ * Slim controller used to render the bookmark list, the home page of Shaarli.
+ * It also displays permalinks, and process legacy routes based on GET parameters.
+ */
+class BookmarkListController extends ShaarliVisitorController
+{
+    /**
+     * GET / - Displays the bookmark list, with optional filter parameters.
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $legacyResponse = $this->processLegacyController($request, $response);
+        if (null !== $legacyResponse) {
+            return $legacyResponse;
+        }
+
+        $formatter = $this->container->formatterFactory->getFormatter();
+        $formatter->addContextData('base_path', $this->container->basePath);
+
+        $searchTags = normalize_spaces($request->getParam('searchtags') ?? '');
+        $searchTerm = escape(normalize_spaces($request->getParam('searchterm') ?? ''));;
+
+        // Filter bookmarks according search parameters.
+        $visibility = $this->container->sessionManager->getSessionParameter('visibility');
+        $search = [
+            'searchtags' => $searchTags,
+            'searchterm' => $searchTerm,
+        ];
+        $linksToDisplay = $this->container->bookmarkService->search(
+            $search,
+            $visibility,
+            false,
+            !!$this->container->sessionManager->getSessionParameter('untaggedonly')
+        ) ?? [];
+
+        // ---- Handle paging.
+        $keys = [];
+        foreach ($linksToDisplay as $key => $value) {
+            $keys[] = $key;
+        }
+
+        $linksPerPage = $this->container->sessionManager->getSessionParameter('LINKS_PER_PAGE', 20) ?: 20;
+
+        // Select articles according to paging.
+        $pageCount = (int) ceil(count($keys) / $linksPerPage) ?: 1;
+        $page = (int) $request->getParam('page') ?? 1;
+        $page = $page < 1 ? 1 : $page;
+        $page = $page > $pageCount ? $pageCount : $page;
+
+        // Start index.
+        $i = ($page - 1) * $linksPerPage;
+        $end = $i + $linksPerPage;
+
+        $linkDisp = [];
+        $save = false;
+        while ($i < $end && $i < count($keys)) {
+            $save = $this->updateThumbnail($linksToDisplay[$keys[$i]], false) || $save;
+            $link = $formatter->format($linksToDisplay[$keys[$i]]);
+
+            $linkDisp[$keys[$i]] = $link;
+            $i++;
+        }
+
+        if ($save) {
+            $this->container->bookmarkService->save();
+        }
+
+        // Compute paging navigation
+        $searchtagsUrl = $searchTags === '' ? '' : '&searchtags=' . urlencode($searchTags);
+        $searchtermUrl = $searchTerm === '' ? '' : '&searchterm=' . urlencode($searchTerm);
+
+        $previous_page_url = '';
+        if ($i !== count($keys)) {
+            $previous_page_url = '?page=' . ($page + 1) . $searchtermUrl . $searchtagsUrl;
+        }
+        $next_page_url = '';
+        if ($page > 1) {
+            $next_page_url = '?page=' . ($page - 1) . $searchtermUrl . $searchtagsUrl;
+        }
+
+        // Fill all template fields.
+        $data = array_merge(
+            $this->initializeTemplateVars(),
+            [
+                'previous_page_url' => $previous_page_url,
+                'next_page_url' => $next_page_url,
+                'page_current' => $page,
+                'page_max' => $pageCount,
+                'result_count' => count($linksToDisplay),
+                'search_term' => escape($searchTerm),
+                'search_tags' => escape($searchTags),
+                'search_tags_url' => array_map('urlencode', explode(' ', $searchTags)),
+                'visibility' => $visibility,
+                'links' => $linkDisp,
+            ]
+        );
+
+        if (!empty($searchTerm) || !empty($searchTags)) {
+            $data['pagetitle'] = t('Search: ');
+            $data['pagetitle'] .= ! empty($searchTerm) ? $searchTerm . ' ' : '';
+            $bracketWrap = function ($tag) {
+                return '[' . $tag . ']';
+            };
+            $data['pagetitle'] .= ! empty($searchTags)
+                ? implode(' ', array_map($bracketWrap, preg_split('/\s+/', $searchTags))) . ' '
+                : '';
+            $data['pagetitle'] .= '- ';
+        }
+
+        $data['pagetitle'] = ($data['pagetitle'] ?? '') . $this->container->conf->get('general.title', 'Shaarli');
+
+        $this->executePageHooks('render_linklist', $data, TemplatePage::LINKLIST);
+        $this->assignAllView($data);
+
+        return $response->write($this->render(TemplatePage::LINKLIST));
+    }
+
+    /**
+     * GET /shaare/{hash} - Display a single shaare
+     */
+    public function permalink(Request $request, Response $response, array $args): Response
+    {
+        try {
+            $bookmark = $this->container->bookmarkService->findByHash($args['hash']);
+        } catch (BookmarkNotFoundException $e) {
+            $this->assignView('error_message', $e->getMessage());
+
+            return $response->write($this->render(TemplatePage::ERROR_404));
+        }
+
+        $this->updateThumbnail($bookmark);
+
+        $formatter = $this->container->formatterFactory->getFormatter();
+        $formatter->addContextData('base_path', $this->container->basePath);
+
+        $data = array_merge(
+            $this->initializeTemplateVars(),
+            [
+                'pagetitle' => $bookmark->getTitle() .' - '. $this->container->conf->get('general.title', 'Shaarli'),
+                'links' => [$formatter->format($bookmark)],
+            ]
+        );
+
+        $this->executePageHooks('render_linklist', $data, TemplatePage::LINKLIST);
+        $this->assignAllView($data);
+
+        return $response->write($this->render(TemplatePage::LINKLIST));
+    }
+
+    /**
+     * Update the thumbnail of a single bookmark if necessary.
+     */
+    protected function updateThumbnail(Bookmark $bookmark, bool $writeDatastore = true): bool
+    {
+        // Logged in, thumbnails enabled, not a note, is HTTP
+        // and (never retrieved yet or no valid cache file)
+        if ($this->container->loginManager->isLoggedIn()
+            && $this->container->conf->get('thumbnails.mode', Thumbnailer::MODE_NONE) !== Thumbnailer::MODE_NONE
+            && false !== $bookmark->getThumbnail()
+            && !$bookmark->isNote()
+            && (null === $bookmark->getThumbnail() || !is_file($bookmark->getThumbnail()))
+            && startsWith(strtolower($bookmark->getUrl()), 'http')
+        ) {
+            $bookmark->setThumbnail($this->container->thumbnailer->get($bookmark->getUrl()));
+            $this->container->bookmarkService->set($bookmark, $writeDatastore);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * @return string[] Default template variables without values.
+     */
+    protected function initializeTemplateVars(): array
+    {
+        return [
+            'previous_page_url' => '',
+            'next_page_url' => '',
+            'page_max' => '',
+            'search_tags' => '',
+            'result_count' => '',
+        ];
+    }
+
+    /**
+     * Process legacy routes if necessary. They used query parameters.
+     * If no legacy routes is passed, return null.
+     */
+    protected function processLegacyController(Request $request, Response $response): ?Response
+    {
+        // Legacy smallhash filter
+        $queryString = $this->container->environment['QUERY_STRING'] ?? null;
+        if (null !== $queryString && 1 === preg_match('/^([a-zA-Z0-9-_@]{6})($|&|#)/', $queryString, $match)) {
+            return $this->redirect($response, '/shaare/' . $match[1]);
+        }
+
+        // Legacy controllers (mostly used for redirections)
+        if (null !== $request->getQueryParam('do')) {
+            $legacyController = new LegacyController($this->container);
+
+            try {
+                return $legacyController->process($request, $response, $request->getQueryParam('do'));
+            } catch (UnknowLegacyRouteException $e) {
+                // We ignore legacy 404
+                return null;
+            }
+        }
+
+        // Legacy GET admin routes
+        $legacyGetRoutes = array_intersect(
+            LegacyController::LEGACY_GET_ROUTES,
+            array_keys($request->getQueryParams() ?? [])
+        );
+        if (1 === count($legacyGetRoutes)) {
+            $legacyController = new LegacyController($this->container);
+
+            return $legacyController->process($request, $response, $legacyGetRoutes[0]);
+        }
+
+        return null;
+    }
+}
diff --git a/application/front/controller/visitor/DailyController.php b/application/front/controller/visitor/DailyController.php
new file mode 100644
index 00000000..07617cf1
--- /dev/null
+++ b/application/front/controller/visitor/DailyController.php
@@ -0,0 +1,192 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use DateTime;
+use DateTimeImmutable;
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class DailyController
+ *
+ * Slim controller used to render the daily page.
+ */
+class DailyController extends ShaarliVisitorController
+{
+    public static $DAILY_RSS_NB_DAYS = 8;
+
+    /**
+     * Controller displaying all bookmarks published in a single day.
+     * It take a `day` date query parameter (format YYYYMMDD).
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        $day = $request->getQueryParam('day') ?? date('Ymd');
+
+        $availableDates = $this->container->bookmarkService->days();
+        $nbAvailableDates = count($availableDates);
+        $index = array_search($day, $availableDates);
+
+        if ($index === false) {
+            // no bookmarks for day, but at least one day with bookmarks
+            $day = $availableDates[$nbAvailableDates - 1] ?? $day;
+            $previousDay = $availableDates[$nbAvailableDates - 2] ?? '';
+        } else {
+            $previousDay = $availableDates[$index - 1] ?? '';
+            $nextDay = $availableDates[$index + 1] ?? '';
+        }
+
+        if ($day === date('Ymd')) {
+            $this->assignView('dayDesc', t('Today'));
+        } elseif ($day === date('Ymd', strtotime('-1 days'))) {
+            $this->assignView('dayDesc', t('Yesterday'));
+        }
+
+        try {
+            $linksToDisplay = $this->container->bookmarkService->filterDay($day);
+        } catch (\Exception $exc) {
+            $linksToDisplay = [];
+        }
+
+        $formatter = $this->container->formatterFactory->getFormatter();
+        $formatter->addContextData('base_path', $this->container->basePath);
+        // We pre-format some fields for proper output.
+        foreach ($linksToDisplay as $key => $bookmark) {
+            $linksToDisplay[$key] = $formatter->format($bookmark);
+            // This page is a bit specific, we need raw description to calculate the length
+            $linksToDisplay[$key]['formatedDescription'] = $linksToDisplay[$key]['description'];
+            $linksToDisplay[$key]['description'] = $bookmark->getDescription();
+        }
+
+        $dayDate = DateTime::createFromFormat(Bookmark::LINK_DATE_FORMAT, $day.'_000000');
+        $data = [
+            'linksToDisplay' => $linksToDisplay,
+            'day' => $dayDate->getTimestamp(),
+            'dayDate' => $dayDate,
+            'previousday' => $previousDay ?? '',
+            'nextday' => $nextDay ?? '',
+        ];
+
+        // Hooks are called before column construction so that plugins don't have to deal with columns.
+        $this->executePageHooks('render_daily', $data, TemplatePage::DAILY);
+
+        $data['cols'] = $this->calculateColumns($data['linksToDisplay']);
+
+        $this->assignAllView($data);
+
+        $mainTitle = $this->container->conf->get('general.title', 'Shaarli');
+        $this->assignView(
+            'pagetitle',
+            t('Daily') .' - '. format_date($dayDate, false) . ' - ' . $mainTitle
+        );
+
+        return $response->write($this->render(TemplatePage::DAILY));
+    }
+
+    /**
+     * Daily RSS feed: 1 RSS entry per day giving all the bookmarks on that day.
+     * Gives the last 7 days (which have bookmarks).
+     * This RSS feed cannot be filtered and does not trigger plugins yet.
+     */
+    public function rss(Request $request, Response $response): Response
+    {
+        $response = $response->withHeader('Content-Type', 'application/rss+xml; charset=utf-8');
+
+        $pageUrl = page_url($this->container->environment);
+        $cache = $this->container->pageCacheManager->getCachePage($pageUrl);
+
+        $cached = $cache->cachedVersion();
+        if (!empty($cached)) {
+            return $response->write($cached);
+        }
+
+        $days = [];
+        foreach ($this->container->bookmarkService->search() as $bookmark) {
+            $day = $bookmark->getCreated()->format('Ymd');
+
+            // Stop iterating after DAILY_RSS_NB_DAYS entries
+            if (count($days) === static::$DAILY_RSS_NB_DAYS && !isset($days[$day])) {
+                break;
+            }
+
+            $days[$day][] = $bookmark;
+        }
+
+        // Build the RSS feed.
+        $indexUrl = escape(index_url($this->container->environment));
+
+        $formatter = $this->container->formatterFactory->getFormatter();
+        $formatter->addContextData('index_url', $indexUrl);
+
+        $dataPerDay = [];
+
+        /** @var Bookmark[] $bookmarks */
+        foreach ($days as $day => $bookmarks) {
+            $dayDatetime = DateTimeImmutable::createFromFormat(Bookmark::LINK_DATE_FORMAT, $day.'_000000');
+            $dataPerDay[$day] = [
+                'date' => $dayDatetime,
+                'date_rss' => $dayDatetime->format(DateTime::RSS),
+                'date_human' => format_date($dayDatetime, false, true),
+                'absolute_url' => $indexUrl . 'daily?day=' . $day,
+                'links' => [],
+            ];
+
+            foreach ($bookmarks as $key => $bookmark) {
+                $dataPerDay[$day]['links'][$key] = $formatter->format($bookmark);
+
+                // Make permalink URL absolute
+                if ($bookmark->isNote()) {
+                    $dataPerDay[$day]['links'][$key]['url'] = $indexUrl . $bookmark->getUrl();
+                }
+            }
+        }
+
+        $this->assignView('title', $this->container->conf->get('general.title', 'Shaarli'));
+        $this->assignView('index_url', $indexUrl);
+        $this->assignView('page_url', $pageUrl);
+        $this->assignView('hide_timestamps', $this->container->conf->get('privacy.hide_timestamps', false));
+        $this->assignView('days', $dataPerDay);
+
+        $rssContent = $this->render(TemplatePage::DAILY_RSS);
+
+        $cache->cache($rssContent);
+
+        return $response->write($rssContent);
+    }
+
+    /**
+     * We need to spread the articles on 3 columns.
+     * did not want to use a JavaScript lib like http://masonry.desandro.com/
+     * so I manually spread entries with a simple method: I roughly evaluate the
+     * height of a div according to title and description length.
+     */
+    protected function calculateColumns(array $links): array
+    {
+        // Entries to display, for each column.
+        $columns = [[], [], []];
+        // Rough estimate of columns fill.
+        $fill = [0, 0, 0];
+        foreach ($links as $link) {
+            // Roughly estimate length of entry (by counting characters)
+            // Title: 30 chars = 1 line. 1 line is 30 pixels height.
+            // Description: 836 characters gives roughly 342 pixel height.
+            // This is not perfect, but it's usually OK.
+            $length = strlen($link['title'] ?? '') + (342 * strlen($link['description'] ?? '')) / 836;
+            if (! empty($link['thumbnail'])) {
+                $length += 100; // 1 thumbnails roughly takes 100 pixels height.
+            }
+            // Then put in column which is the less filled:
+            $smallest = min($fill); // find smallest value in array.
+            $index = array_search($smallest, $fill); // find index of this smallest value.
+            array_push($columns[$index], $link); // Put entry in this column.
+            $fill[$index] += $length;
+        }
+
+        return $columns;
+    }
+}
diff --git a/application/front/controller/visitor/ErrorController.php b/application/front/controller/visitor/ErrorController.php
new file mode 100644
index 00000000..10aa84c8
--- /dev/null
+++ b/application/front/controller/visitor/ErrorController.php
@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Front\Exception\ShaarliFrontException;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Controller used to render the error page, with a provided exception.
+ * It is actually used as a Slim error handler.
+ */
+class ErrorController extends ShaarliVisitorController
+{
+    public function __invoke(Request $request, Response $response, \Throwable $throwable): Response
+    {
+        // Unknown error encountered
+        $this->container->pageBuilder->reset();
+
+        if ($throwable instanceof ShaarliFrontException) {
+            // Functional error
+            $this->assignView('message', nl2br($throwable->getMessage()));
+
+            $response = $response->withStatus($throwable->getCode());
+        } else {
+            // Internal error (any other Throwable)
+            if ($this->container->conf->get('dev.debug', false)) {
+                $this->assignView('message', $throwable->getMessage());
+                $this->assignView(
+                    'stacktrace',
+                    nl2br(get_class($throwable) .': '. PHP_EOL . $throwable->getTraceAsString())
+                );
+            } else {
+                $this->assignView('message', t('An unexpected error occurred.'));
+            }
+
+            $response = $response->withStatus(500);
+        }
+
+
+        return $response->write($this->render('error'));
+    }
+}
diff --git a/application/front/controller/visitor/ErrorNotFoundController.php b/application/front/controller/visitor/ErrorNotFoundController.php
new file mode 100644
index 00000000..758dd83b
--- /dev/null
+++ b/application/front/controller/visitor/ErrorNotFoundController.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Controller used to render the 404 error page.
+ */
+class ErrorNotFoundController extends ShaarliVisitorController
+{
+    public function __invoke(Request $request, Response $response): Response
+    {
+        // Request from the API
+        if (false !== strpos($request->getRequestTarget(), '/api/v1')) {
+            return $response->withStatus(404);
+        }
+
+        // This is required because the middleware is ignored if the route is not found.
+        $this->container->basePath = rtrim($request->getUri()->getBasePath(), '/');
+
+        $this->assignView('error_message', t('Requested page could not be found.'));
+
+        return $response->withStatus(404)->write($this->render('404'));
+    }
+}
diff --git a/application/front/controller/visitor/FeedController.php b/application/front/controller/visitor/FeedController.php
new file mode 100644
index 00000000..8d8b546a
--- /dev/null
+++ b/application/front/controller/visitor/FeedController.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Feed\FeedBuilder;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class FeedController
+ *
+ * Slim controller handling ATOM and RSS feed.
+ */
+class FeedController extends ShaarliVisitorController
+{
+    public function atom(Request $request, Response $response): Response
+    {
+        return $this->processRequest(FeedBuilder::$FEED_ATOM, $request, $response);
+    }
+
+    public function rss(Request $request, Response $response): Response
+    {
+        return $this->processRequest(FeedBuilder::$FEED_RSS, $request, $response);
+    }
+
+    protected function processRequest(string $feedType, Request $request, Response $response): Response
+    {
+        $response = $response->withHeader('Content-Type', 'application/'. $feedType .'+xml; charset=utf-8');
+
+        $pageUrl = page_url($this->container->environment);
+        $cache = $this->container->pageCacheManager->getCachePage($pageUrl);
+
+        $cached = $cache->cachedVersion();
+        if (!empty($cached)) {
+            return $response->write($cached);
+        }
+
+        // Generate data.
+        $this->container->feedBuilder->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
+        $this->container->feedBuilder->setHideDates($this->container->conf->get('privacy.hide_timestamps', false));
+        $this->container->feedBuilder->setUsePermalinks(
+            null !== $request->getParam('permalinks') || !$this->container->conf->get('feed.rss_permalinks')
+        );
+
+        $data = $this->container->feedBuilder->buildData($feedType, $request->getParams());
+
+        $this->executePageHooks('render_feed', $data, 'feed.' . $feedType);
+        $this->assignAllView($data);
+
+        $content = $this->render('feed.' . $feedType);
+
+        $cache->cache($content);
+
+        return $response->write($content);
+    }
+}
diff --git a/application/front/controller/visitor/InstallController.php b/application/front/controller/visitor/InstallController.php
new file mode 100644
index 00000000..7cb32777
--- /dev/null
+++ b/application/front/controller/visitor/InstallController.php
@@ -0,0 +1,165 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\ApplicationUtils;
+use Shaarli\Container\ShaarliContainer;
+use Shaarli\Front\Exception\AlreadyInstalledException;
+use Shaarli\Front\Exception\ResourcePermissionException;
+use Shaarli\Languages;
+use Shaarli\Security\SessionManager;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Slim controller used to render install page, and create initial configuration file.
+ */
+class InstallController extends ShaarliVisitorController
+{
+    public const SESSION_TEST_KEY = 'session_tested';
+    public const SESSION_TEST_VALUE = 'Working';
+
+    public function __construct(ShaarliContainer $container)
+    {
+        parent::__construct($container);
+
+        if (is_file($this->container->conf->getConfigFileExt())) {
+            throw new AlreadyInstalledException();
+        }
+    }
+
+    /**
+     * Display the install template page.
+     * Also test file permissions and sessions beforehand.
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        // Before installation, we'll make sure that permissions are set properly, and sessions are working.
+        $this->checkPermissions();
+
+        if (static::SESSION_TEST_VALUE
+            !== $this->container->sessionManager->getSessionParameter(static::SESSION_TEST_KEY)
+        ) {
+            $this->container->sessionManager->setSessionParameter(static::SESSION_TEST_KEY, static::SESSION_TEST_VALUE);
+
+            return $this->redirect($response, '/install/session-test');
+        }
+
+        [$continents, $cities] = generateTimeZoneData(timezone_identifiers_list(), date_default_timezone_get());
+
+        $this->assignView('continents', $continents);
+        $this->assignView('cities', $cities);
+        $this->assignView('languages', Languages::getAvailableLanguages());
+
+        return $response->write($this->render('install'));
+    }
+
+    /**
+     * Route checking that the session parameter has been properly saved between two distinct requests.
+     * If the session parameter is preserved, redirect to install template page, otherwise displays error.
+     */
+    public function sessionTest(Request $request, Response $response): Response
+    {
+        // This part makes sure sessions works correctly.
+        // (Because on some hosts, session.save_path may not be set correctly,
+        // or we may not have write access to it.)
+        if (static::SESSION_TEST_VALUE
+            !== $this->container->sessionManager->getSessionParameter(static::SESSION_TEST_KEY)
+        ) {
+            // Step 2: Check if data in session is correct.
+            $msg = t(
+                '<pre>Sessions do not seem to work correctly on your server.<br>'.
+                'Make sure the variable "session.save_path" is set correctly in your PHP config, '.
+                'and that you have write access to it.<br>'.
+                'It currently points to %s.<br>'.
+                'On some browsers, accessing your server via a hostname like \'localhost\' '.
+                'or any custom hostname without a dot causes cookie storage to fail. '.
+                'We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>'
+            );
+            $msg = sprintf($msg, $this->container->sessionManager->getSavePath());
+
+            $this->assignView('message', $msg);
+
+            return $response->write($this->render('error'));
+        }
+
+        return $this->redirect($response, '/install');
+    }
+
+    /**
+     * Save installation form and initialize config file and datastore if necessary.
+     */
+    public function save(Request $request, Response $response): Response
+    {
+        $timezone = 'UTC';
+        if (!empty($request->getParam('continent'))
+            && !empty($request->getParam('city'))
+            && isTimeZoneValid($request->getParam('continent'), $request->getParam('city'))
+        ) {
+            $timezone = $request->getParam('continent') . '/' . $request->getParam('city');
+        }
+        $this->container->conf->set('general.timezone', $timezone);
+
+        $login = $request->getParam('setlogin');
+        $this->container->conf->set('credentials.login', $login);
+        $salt = sha1(uniqid('', true) .'_'. mt_rand());
+        $this->container->conf->set('credentials.salt', $salt);
+        $this->container->conf->set('credentials.hash', sha1($request->getParam('setpassword') . $login . $salt));
+
+        if (!empty($request->getParam('title'))) {
+            $this->container->conf->set('general.title', escape($request->getParam('title')));
+        } else {
+            $this->container->conf->set(
+                'general.title',
+                'Shared bookmarks on '.escape(index_url($this->container->environment))
+            );
+        }
+
+        $this->container->conf->set('translation.language', escape($request->getParam('language')));
+        $this->container->conf->set('updates.check_updates', !empty($request->getParam('updateCheck')));
+        $this->container->conf->set('api.enabled', !empty($request->getParam('enableApi')));
+        $this->container->conf->set(
+            'api.secret',
+            generate_api_secret(
+                $this->container->conf->get('credentials.login'),
+                $this->container->conf->get('credentials.salt')
+            )
+        );
+        $this->container->conf->set('general.header_link', $this->container->basePath . '/');
+
+        try {
+            // Everything is ok, let's create config file.
+            $this->container->conf->write($this->container->loginManager->isLoggedIn());
+        } catch (\Exception $e) {
+            $this->assignView('message', t('Error while writing config file after configuration update.'));
+            $this->assignView('stacktrace', $e->getMessage() . PHP_EOL . $e->getTraceAsString());
+
+            return $response->write($this->render('error'));
+        }
+
+        $this->container->sessionManager->setSessionParameter(
+            SessionManager::KEY_SUCCESS_MESSAGES,
+            [t('Shaarli is now configured. Please login and start shaaring your bookmarks!')]
+        );
+
+        return $this->redirect($response, '/login');
+    }
+
+    protected function checkPermissions(): bool
+    {
+        // Ensure Shaarli has proper access to its resources
+        $errors = ApplicationUtils::checkResourcePermissions($this->container->conf);
+        if (empty($errors)) {
+            return true;
+        }
+
+        $message = t('Insufficient permissions:') . PHP_EOL;
+        foreach ($errors as $error) {
+            $message .= PHP_EOL . $error;
+        }
+
+        throw new ResourcePermissionException($message);
+    }
+}
diff --git a/application/front/controller/visitor/LoginController.php b/application/front/controller/visitor/LoginController.php
new file mode 100644
index 00000000..121ba40b
--- /dev/null
+++ b/application/front/controller/visitor/LoginController.php
@@ -0,0 +1,154 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Front\Exception\CantLoginException;
+use Shaarli\Front\Exception\LoginBannedException;
+use Shaarli\Front\Exception\WrongTokenException;
+use Shaarli\Render\TemplatePage;
+use Shaarli\Security\CookieManager;
+use Shaarli\Security\SessionManager;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class LoginController
+ *
+ * Slim controller used to render the login page.
+ *
+ * The login page is not available if the user is banned
+ * or if open shaarli setting is enabled.
+ */
+class LoginController extends ShaarliVisitorController
+{
+    /**
+     * GET /login - Display the login page.
+     */
+    public function index(Request $request, Response $response): Response
+    {
+        try {
+            $this->checkLoginState();
+        } catch (CantLoginException $e) {
+            return $this->redirect($response, '/');
+        }
+
+        if ($request->getParam('login') !== null) {
+            $this->assignView('username', escape($request->getParam('login')));
+        }
+
+        $returnUrl = $request->getParam('returnurl') ?? $this->container->environment['HTTP_REFERER'] ?? null;
+
+        $this
+            ->assignView('returnurl', escape($returnUrl))
+            ->assignView('remember_user_default', $this->container->conf->get('privacy.remember_user_default', true))
+            ->assignView('pagetitle', t('Login') .' - '. $this->container->conf->get('general.title', 'Shaarli'))
+        ;
+
+        return $response->write($this->render(TemplatePage::LOGIN));
+    }
+
+    /**
+     * POST /login - Process login
+     */
+    public function login(Request $request, Response $response): Response
+    {
+        if (!$this->container->sessionManager->checkToken($request->getParam('token'))) {
+            throw new WrongTokenException();
+        }
+
+        try {
+            $this->checkLoginState();
+        } catch (CantLoginException $e) {
+            return $this->redirect($response, '/');
+        }
+
+        if (!$this->container->loginManager->checkCredentials(
+                $this->container->environment['REMOTE_ADDR'],
+                client_ip_id($this->container->environment),
+                $request->getParam('login'),
+                $request->getParam('password')
+            )
+        ) {
+            $this->container->loginManager->handleFailedLogin($this->container->environment);
+
+            $this->container->sessionManager->setSessionParameter(
+                SessionManager::KEY_ERROR_MESSAGES,
+                [t('Wrong login/password.')]
+            );
+
+            // Call controller directly instead of unnecessary redirection
+            return $this->index($request, $response);
+        }
+
+        $this->container->loginManager->handleSuccessfulLogin($this->container->environment);
+
+        $cookiePath = $this->container->basePath . '/';
+        $expirationTime = $this->saveLongLastingSession($request, $cookiePath);
+        $this->renewUserSession($cookiePath, $expirationTime);
+
+        // Force referer from given return URL
+        $this->container->environment['HTTP_REFERER'] = $request->getParam('returnurl');
+
+        return $this->redirectFromReferer($request, $response, ['login', 'install']);
+    }
+
+    /**
+     * Make sure that the user is allowed to login and/or displaying the login page:
+     *   - not already logged in
+     *   - not open shaarli
+     *   - not banned
+     */
+    protected function checkLoginState(): bool
+    {
+        if ($this->container->loginManager->isLoggedIn()
+            || $this->container->conf->get('security.open_shaarli', false)
+        ) {
+            throw new CantLoginException();
+        }
+
+        if (true !== $this->container->loginManager->canLogin($this->container->environment)) {
+            throw new LoginBannedException();
+        }
+
+        return true;
+    }
+
+    /**
+     * @return int Session duration in seconds
+     */
+    protected function saveLongLastingSession(Request $request, string $cookiePath): int
+    {
+        if (empty($request->getParam('longlastingsession'))) {
+            // Standard session expiration (=when browser closes)
+            $expirationTime = 0;
+        } else {
+            // Keep the session cookie even after the browser closes
+            $this->container->sessionManager->setStaySignedIn(true);
+            $expirationTime = $this->container->sessionManager->extendSession();
+        }
+
+        $this->container->cookieManager->setCookieParameter(
+            CookieManager::STAY_SIGNED_IN,
+            $this->container->loginManager->getStaySignedInToken(),
+            $expirationTime,
+            $cookiePath
+        );
+
+        return $expirationTime;
+    }
+
+    protected function renewUserSession(string $cookiePath, int $expirationTime): void
+    {
+        // Send cookie with the new expiration date to the browser
+        $this->container->sessionManager->destroy();
+        $this->container->sessionManager->cookieParameters(
+            $expirationTime,
+            $cookiePath,
+            $this->container->environment['SERVER_NAME']
+        );
+        $this->container->sessionManager->start();
+        $this->container->sessionManager->regenerateId(true);
+    }
+}
diff --git a/application/front/controller/visitor/OpenSearchController.php b/application/front/controller/visitor/OpenSearchController.php
new file mode 100644
index 00000000..36d60acf
--- /dev/null
+++ b/application/front/controller/visitor/OpenSearchController.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Render\TemplatePage;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class OpenSearchController
+ *
+ * Slim controller used to render open search template.
+ * This allows to add Shaarli as a search engine within the browser.
+ */
+class OpenSearchController extends ShaarliVisitorController
+{
+    public function index(Request $request, Response $response): Response
+    {
+        $response = $response->withHeader('Content-Type', 'application/opensearchdescription+xml; charset=utf-8');
+
+        $this->assignView('serverurl', index_url($this->container->environment));
+
+        return $response->write($this->render(TemplatePage::OPEN_SEARCH));
+    }
+}
diff --git a/application/front/controller/visitor/PictureWallController.php b/application/front/controller/visitor/PictureWallController.php
new file mode 100644
index 00000000..3c57f8dd
--- /dev/null
+++ b/application/front/controller/visitor/PictureWallController.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Front\Exception\ThumbnailsDisabledException;
+use Shaarli\Render\TemplatePage;
+use Shaarli\Thumbnailer;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class PicturesWallController
+ *
+ * Slim controller used to render the pictures wall page.
+ * If thumbnails mode is set to NONE, we just render the template without any image.
+ */
+class PictureWallController extends ShaarliVisitorController
+{
+    public function index(Request $request, Response $response): Response
+    {
+        if ($this->container->conf->get('thumbnails.mode', Thumbnailer::MODE_NONE) === Thumbnailer::MODE_NONE) {
+            throw new ThumbnailsDisabledException();
+        }
+
+        $this->assignView(
+            'pagetitle',
+            t('Picture wall') .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+
+        // Optionally filter the results:
+        $links = $this->container->bookmarkService->search($request->getQueryParams());
+        $linksToDisplay = [];
+
+        // Get only bookmarks which have a thumbnail.
+        // Note: we do not retrieve thumbnails here, the request is too heavy.
+        $formatter = $this->container->formatterFactory->getFormatter('raw');
+        foreach ($links as $key => $link) {
+            if (!empty($link->getThumbnail())) {
+                $linksToDisplay[] = $formatter->format($link);
+            }
+        }
+
+        $data = ['linksToDisplay' => $linksToDisplay];
+        $this->executePageHooks('render_picwall', $data, TemplatePage::PICTURE_WALL);
+
+        foreach ($data as $key => $value) {
+            $this->assignView($key, $value);
+        }
+
+        return $response->write($this->render(TemplatePage::PICTURE_WALL));
+    }
+}
diff --git a/application/front/controller/visitor/PublicSessionFilterController.php b/application/front/controller/visitor/PublicSessionFilterController.php
new file mode 100644
index 00000000..1a66362d
--- /dev/null
+++ b/application/front/controller/visitor/PublicSessionFilterController.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Security\SessionManager;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Slim controller used to handle filters stored in the visitor session, links per page, etc.
+ */
+class PublicSessionFilterController extends ShaarliVisitorController
+{
+    /**
+     * GET /links-per-page: set the number of bookmarks to display per page in homepage
+     */
+    public function linksPerPage(Request $request, Response $response): Response
+    {
+        $linksPerPage = $request->getParam('nb') ?? null;
+        if (null === $linksPerPage || false === is_numeric($linksPerPage)) {
+            $linksPerPage = $this->container->conf->get('general.links_per_page', 20);
+        }
+
+        $this->container->sessionManager->setSessionParameter(
+            SessionManager::KEY_LINKS_PER_PAGE,
+            abs(intval($linksPerPage))
+        );
+
+        return $this->redirectFromReferer($request, $response, ['linksperpage'], ['nb']);
+    }
+
+    /**
+     * GET /untagged-only: allows to display only bookmarks without any tag
+     */
+    public function untaggedOnly(Request $request, Response $response): Response
+    {
+        $this->container->sessionManager->setSessionParameter(
+            SessionManager::KEY_UNTAGGED_ONLY,
+            empty($this->container->sessionManager->getSessionParameter(SessionManager::KEY_UNTAGGED_ONLY))
+        );
+
+        return $this->redirectFromReferer($request, $response, ['untaggedonly', 'untagged-only']);
+    }
+}
diff --git a/application/front/controller/visitor/ShaarliVisitorController.php b/application/front/controller/visitor/ShaarliVisitorController.php
new file mode 100644
index 00000000..55c075a2
--- /dev/null
+++ b/application/front/controller/visitor/ShaarliVisitorController.php
@@ -0,0 +1,180 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Bookmark\BookmarkFilter;
+use Shaarli\Container\ShaarliContainer;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class ShaarliVisitorController
+ *
+ * All controllers accessible by visitors (non logged in users) should extend this abstract class.
+ * Contains a few helper function for template rendering, plugins, etc.
+ *
+ * @package Shaarli\Front\Controller\Visitor
+ */
+abstract class ShaarliVisitorController
+{
+    /** @var ShaarliContainer */
+    protected $container;
+
+    /** @param ShaarliContainer $container Slim container (extended for attribute completion). */
+    public function __construct(ShaarliContainer $container)
+    {
+        $this->container = $container;
+    }
+
+    /**
+     * Assign variables to RainTPL template through the PageBuilder.
+     *
+     * @param mixed $value Value to assign to the template
+     */
+    protected function assignView(string $name, $value): self
+    {
+        $this->container->pageBuilder->assign($name, $value);
+
+        return $this;
+    }
+
+    /**
+     * Assign variables to RainTPL template through the PageBuilder.
+     *
+     * @param mixed $data Values to assign to the template and their keys
+     */
+    protected function assignAllView(array $data): self
+    {
+        foreach ($data as $key => $value) {
+            $this->assignView($key, $value);
+        }
+
+        return $this;
+    }
+
+    protected function render(string $template): string
+    {
+        $this->assignView('linkcount', $this->container->bookmarkService->count(BookmarkFilter::$ALL));
+        $this->assignView('privateLinkcount', $this->container->bookmarkService->count(BookmarkFilter::$PRIVATE));
+
+        $this->executeDefaultHooks($template);
+
+        $this->assignView('plugin_errors', $this->container->pluginManager->getErrors());
+
+        return $this->container->pageBuilder->render($template, $this->container->basePath);
+    }
+
+    /**
+     * Call plugin hooks for header, footer and includes, specifying which page will be rendered.
+     * Then assign generated data to RainTPL.
+     */
+    protected function executeDefaultHooks(string $template): void
+    {
+        $common_hooks = [
+            'includes',
+            'header',
+            'footer',
+        ];
+
+        $parameters = $this->buildPluginParameters($template);
+
+        foreach ($common_hooks as $name) {
+            $pluginData = [];
+            $this->container->pluginManager->executeHooks(
+                'render_' . $name,
+                $pluginData,
+                $parameters
+            );
+            $this->assignView('plugins_' . $name, $pluginData);
+        }
+    }
+
+    protected function executePageHooks(string $hook, array &$data, string $template = null): void
+    {
+        $this->container->pluginManager->executeHooks(
+            $hook,
+            $data,
+            $this->buildPluginParameters($template)
+        );
+    }
+
+    protected function buildPluginParameters(?string $template): array
+    {
+        return [
+            'target' => $template,
+            'loggedin' => $this->container->loginManager->isLoggedIn(),
+            'basePath' => $this->container->basePath,
+            'bookmarkService' => $this->container->bookmarkService
+        ];
+    }
+
+    /**
+     * Simple helper which prepend the base path to redirect path.
+     *
+     * @param Response $response
+     * @param string $path Absolute path, e.g.: `/`, or `/admin/shaare/123` regardless of install directory
+     *
+     * @return Response updated
+     */
+    protected function redirect(Response $response, string $path): Response
+    {
+        return $response->withRedirect($this->container->basePath . $path);
+    }
+
+    /**
+     * Generates a redirection to the previous page, based on the HTTP_REFERER.
+     * It fails back to the home page.
+     *
+     * @param array $loopTerms   Terms to remove from path and query string to prevent direction loop.
+     * @param array $clearParams List of parameter to remove from the query string of the referrer.
+     */
+    protected function redirectFromReferer(
+        Request $request,
+        Response $response,
+        array $loopTerms = [],
+        array $clearParams = [],
+        string $anchor = null
+    ): Response {
+        $defaultPath = $this->container->basePath . '/';
+        $referer = $this->container->environment['HTTP_REFERER'] ?? null;
+
+        if (null !== $referer) {
+            $currentUrl = parse_url($referer);
+            // If the referer is not related to Shaarli instance, redirect to default
+            if (isset($currentUrl['host'])
+                && strpos(index_url($this->container->environment), $currentUrl['host']) === false
+            ) {
+                return $response->withRedirect($defaultPath);
+            }
+
+            parse_str($currentUrl['query'] ?? '', $params);
+            $path = $currentUrl['path'] ?? $defaultPath;
+        } else {
+            $params = [];
+            $path = $defaultPath;
+        }
+
+        // Prevent redirection loop
+        if (isset($currentUrl)) {
+            foreach ($clearParams as $value) {
+                unset($params[$value]);
+            }
+
+            $checkQuery = implode('', array_keys($params));
+            foreach ($loopTerms as $value) {
+                if (strpos($path . $checkQuery, $value) !== false) {
+                    $params = [];
+                    $path = $defaultPath;
+                    break;
+                }
+            }
+        }
+
+        $queryString = count($params) > 0 ? '?'. http_build_query($params) : '';
+        $anchor = $anchor ? '#' . $anchor : '';
+
+        return $response->withRedirect($path . $queryString . $anchor);
+    }
+}
diff --git a/application/front/controller/visitor/TagCloudController.php b/application/front/controller/visitor/TagCloudController.php
new file mode 100644
index 00000000..76ed7690
--- /dev/null
+++ b/application/front/controller/visitor/TagCloudController.php
@@ -0,0 +1,121 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class TagCloud
+ *
+ * Slim controller used to render the tag cloud and tag list pages.
+ */
+class TagCloudController extends ShaarliVisitorController
+{
+    protected const TYPE_CLOUD = 'cloud';
+    protected const TYPE_LIST = 'list';
+
+    /**
+     * Display the tag cloud through the template engine.
+     * This controller a few filters:
+     *   - Visibility stored in the session for logged in users
+     *   - `searchtags` query parameter: will return tags associated with filter in at least one bookmark
+     */
+    public function cloud(Request $request, Response $response): Response
+    {
+        return $this->processRequest(static::TYPE_CLOUD, $request, $response);
+    }
+
+    /**
+     * Display the tag list through the template engine.
+     * This controller a few filters:
+     *   - Visibility stored in the session for logged in users
+     *   - `searchtags` query parameter: will return tags associated with filter in at least one bookmark
+     *   - `sort` query parameters:
+     *       + `usage` (default): most used tags first
+     *       + `alpha`: alphabetical order
+     */
+    public function list(Request $request, Response $response): Response
+    {
+        return $this->processRequest(static::TYPE_LIST, $request, $response);
+    }
+
+    /**
+     * Process the request for both tag cloud and tag list endpoints.
+     */
+    protected function processRequest(string $type, Request $request, Response $response): Response
+    {
+        if ($this->container->loginManager->isLoggedIn() === true) {
+            $visibility = $this->container->sessionManager->getSessionParameter('visibility');
+        }
+
+        $sort = $request->getQueryParam('sort');
+        $searchTags = $request->getQueryParam('searchtags');
+        $filteringTags = $searchTags !== null ? explode(' ', $searchTags) : [];
+
+        $tags = $this->container->bookmarkService->bookmarksCountPerTag($filteringTags, $visibility ?? null);
+
+        if (static::TYPE_CLOUD === $type || 'alpha' === $sort) {
+            // TODO: the sorting should be handled by bookmarkService instead of the controller
+            alphabetical_sort($tags, false, true);
+        }
+
+        if (static::TYPE_CLOUD === $type) {
+            $tags = $this->formatTagsForCloud($tags);
+        }
+
+        $tagsUrl = [];
+        foreach ($tags as $tag => $value) {
+            $tagsUrl[escape($tag)] = urlencode((string) $tag);
+        }
+
+        $searchTags = implode(' ', escape($filteringTags));
+        $searchTagsUrl = urlencode(implode(' ', $filteringTags));
+        $data = [
+            'search_tags' => escape($searchTags),
+            'search_tags_url' => $searchTagsUrl,
+            'tags' => escape($tags),
+            'tags_url' => $tagsUrl,
+        ];
+        $this->executePageHooks('render_tag' . $type, $data, 'tag.' . $type);
+        $this->assignAllView($data);
+
+        $searchTags = !empty($searchTags) ? $searchTags .' - ' : '';
+        $this->assignView(
+            'pagetitle',
+            $searchTags . t('Tag '. $type) .' - '. $this->container->conf->get('general.title', 'Shaarli')
+        );
+
+        return $response->write($this->render('tag.' . $type));
+    }
+
+    /**
+     * Format the tags array for the tag cloud template.
+     *
+     * @param array<string, int> $tags List of tags as key with count as value
+     *
+     * @return mixed[] List of tags as key, with count and expected font size in a subarray
+     */
+    protected function formatTagsForCloud(array $tags): array
+    {
+        // We sort tags alphabetically, then choose a font size according to count.
+        // First, find max value.
+        $maxCount = count($tags) > 0 ? max($tags) : 0;
+        $logMaxCount = $maxCount > 1 ? log($maxCount, 30) : 1;
+        $tagList = [];
+        foreach ($tags as $key => $value) {
+            // Tag font size scaling:
+            //   default 15 and 30 logarithm bases affect scaling,
+            //   2.2 and 0.8 are arbitrary font sizes in em.
+            $size = log($value, 15) / $logMaxCount * 2.2 + 0.8;
+            $tagList[$key] = [
+                'count' => $value,
+                'size' => number_format($size, 2, '.', ''),
+            ];
+        }
+
+        return $tagList;
+    }
+}
diff --git a/application/front/controller/visitor/TagController.php b/application/front/controller/visitor/TagController.php
new file mode 100644
index 00000000..de4e7ea2
--- /dev/null
+++ b/application/front/controller/visitor/TagController.php
@@ -0,0 +1,118 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Class TagController
+ *
+ * Slim controller handle tags.
+ */
+class TagController extends ShaarliVisitorController
+{
+    /**
+     * Add another tag in the current search through an HTTP redirection.
+     *
+     * @param array $args Should contain `newTag` key as tag to add to current search
+     */
+    public function addTag(Request $request, Response $response, array $args): Response
+    {
+        $newTag = $args['newTag'] ?? null;
+        $referer = $this->container->environment['HTTP_REFERER'] ?? null;
+
+        // In case browser does not send HTTP_REFERER, we search a single tag
+        if (null === $referer) {
+            if (null !== $newTag) {
+                return $this->redirect($response, '/?searchtags='. urlencode($newTag));
+            }
+
+            return $this->redirect($response, '/');
+        }
+
+        $currentUrl = parse_url($referer);
+        parse_str($currentUrl['query'] ?? '', $params);
+
+        if (null === $newTag) {
+            return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
+        }
+
+        // Prevent redirection loop
+        if (isset($params['addtag'])) {
+            unset($params['addtag']);
+        }
+
+        // Check if this tag is already in the search query and ignore it if it is.
+        // Each tag is always separated by a space
+        $currentTags = isset($params['searchtags']) ? explode(' ', $params['searchtags']) : [];
+
+        $addtag = true;
+        foreach ($currentTags as $value) {
+            if ($value === $newTag) {
+                $addtag = false;
+                break;
+            }
+        }
+
+        // Append the tag if necessary
+        if (true === $addtag) {
+            $currentTags[] = trim($newTag);
+        }
+
+        $params['searchtags'] = trim(implode(' ', $currentTags));
+
+        // We also remove page (keeping the same page has no sense, since the results are different)
+        unset($params['page']);
+
+        return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
+    }
+
+    /**
+     * Remove a tag from the current search through an HTTP redirection.
+     *
+     * @param array $args Should contain `tag` key as tag to remove from current search
+     */
+    public function removeTag(Request $request, Response $response, array $args): Response
+    {
+        $referer = $this->container->environment['HTTP_REFERER'] ?? null;
+
+        // If the referrer is not provided, we can update the search, so we failback on the bookmark list
+        if (empty($referer)) {
+            return $this->redirect($response, '/');
+        }
+
+        $tagToRemove = $args['tag'] ?? null;
+        $currentUrl = parse_url($referer);
+        parse_str($currentUrl['query'] ?? '', $params);
+
+        if (null === $tagToRemove) {
+            return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
+        }
+
+        // Prevent redirection loop
+        if (isset($params['removetag'])) {
+            unset($params['removetag']);
+        }
+
+        if (isset($params['searchtags'])) {
+            $tags = explode(' ', $params['searchtags']);
+            // Remove value from array $tags.
+            $tags = array_diff($tags, [$tagToRemove]);
+            $params['searchtags'] = implode(' ', $tags);
+
+            if (empty($params['searchtags'])) {
+                unset($params['searchtags']);
+            }
+
+            // We also remove page (keeping the same page has no sense, since the results are different)
+            unset($params['page']);
+        }
+
+        $queryParams = count($params) > 0 ? '?' . http_build_query($params) : '';
+
+        return $response->withRedirect(($currentUrl['path'] ?? './') . $queryParams);
+    }
+}
diff --git a/application/front/exceptions/AlreadyInstalledException.php b/application/front/exceptions/AlreadyInstalledException.php
new file mode 100644
index 00000000..4add86cf
--- /dev/null
+++ b/application/front/exceptions/AlreadyInstalledException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+class AlreadyInstalledException extends ShaarliFrontException
+{
+    public function __construct()
+    {
+        $message = t('Shaarli has already been installed. Login to edit the configuration.');
+
+        parent::__construct($message, 401);
+    }
+}
diff --git a/application/front/exceptions/CantLoginException.php b/application/front/exceptions/CantLoginException.php
new file mode 100644
index 00000000..cd16635d
--- /dev/null
+++ b/application/front/exceptions/CantLoginException.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+class CantLoginException extends \Exception
+{
+
+}
diff --git a/application/front/exceptions/LoginBannedException.php b/application/front/exceptions/LoginBannedException.php
new file mode 100644
index 00000000..79d0ea15
--- /dev/null
+++ b/application/front/exceptions/LoginBannedException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+class LoginBannedException extends ShaarliFrontException
+{
+    public function __construct()
+    {
+        $message = t('You have been banned after too many failed login attempts. Try again later.');
+
+        parent::__construct($message, 401);
+    }
+}
diff --git a/application/front/exceptions/OpenShaarliPasswordException.php b/application/front/exceptions/OpenShaarliPasswordException.php
new file mode 100644
index 00000000..a6f0b3ae
--- /dev/null
+++ b/application/front/exceptions/OpenShaarliPasswordException.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+/**
+ * Class OpenShaarliPasswordException
+ *
+ * Raised if the user tries to change the admin password on an open shaarli instance.
+ */
+class OpenShaarliPasswordException extends ShaarliFrontException
+{
+    public function __construct()
+    {
+        parent::__construct(t('You are not supposed to change a password on an Open Shaarli.'), 403);
+    }
+}
diff --git a/application/front/exceptions/ResourcePermissionException.php b/application/front/exceptions/ResourcePermissionException.php
new file mode 100644
index 00000000..8fbf03b9
--- /dev/null
+++ b/application/front/exceptions/ResourcePermissionException.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+class ResourcePermissionException extends ShaarliFrontException
+{
+    public function __construct(string $message)
+    {
+        parent::__construct($message, 500);
+    }
+}
diff --git a/application/front/exceptions/ShaarliFrontException.php b/application/front/exceptions/ShaarliFrontException.php
new file mode 100644
index 00000000..73847e6d
--- /dev/null
+++ b/application/front/exceptions/ShaarliFrontException.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+use Throwable;
+
+/**
+ * Class ShaarliException
+ *
+ * Exception class used to defined any custom exception thrown during front rendering.
+ *
+ * @package Front\Exception
+ */
+class ShaarliFrontException extends \Exception
+{
+    /** Override parent constructor to force $message and $httpCode parameters to be set. */
+    public function __construct(string $message, int $httpCode, Throwable $previous = null)
+    {
+        parent::__construct($message, $httpCode, $previous);
+    }
+}
diff --git a/application/front/exceptions/ThumbnailsDisabledException.php b/application/front/exceptions/ThumbnailsDisabledException.php
new file mode 100644
index 00000000..0ed337f5
--- /dev/null
+++ b/application/front/exceptions/ThumbnailsDisabledException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+class ThumbnailsDisabledException extends ShaarliFrontException
+{
+    public function __construct()
+    {
+        $message = t('Picture wall unavailable (thumbnails are disabled).');
+
+        parent::__construct($message, 400);
+    }
+}
diff --git a/application/front/exceptions/UnauthorizedException.php b/application/front/exceptions/UnauthorizedException.php
new file mode 100644
index 00000000..4231094a
--- /dev/null
+++ b/application/front/exceptions/UnauthorizedException.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+/**
+ * Class UnauthorizedException
+ *
+ * Exception raised if the user tries to access a ShaarliAdminController while logged out.
+ */
+class UnauthorizedException extends \Exception
+{
+
+}
diff --git a/application/front/exceptions/WrongTokenException.php b/application/front/exceptions/WrongTokenException.php
new file mode 100644
index 00000000..42002720
--- /dev/null
+++ b/application/front/exceptions/WrongTokenException.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Exception;
+
+/**
+ * Class OpenShaarliPasswordException
+ *
+ * Raised if the user tries to perform an action with an invalid XSRF token.
+ */
+class WrongTokenException extends ShaarliFrontException
+{
+    public function __construct()
+    {
+        parent::__construct(t('Wrong token.'), 403);
+    }
+}
diff --git a/application/http/HttpAccess.php b/application/http/HttpAccess.php
new file mode 100644
index 00000000..81d9e076
--- /dev/null
+++ b/application/http/HttpAccess.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Http;
+
+/**
+ * Class HttpAccess
+ *
+ * This is mostly an OOP wrapper for HTTP functions defined in `HttpUtils`.
+ * It is used as dependency injection in Shaarli's container.
+ *
+ * @package Shaarli\Http
+ */
+class HttpAccess
+{
+    public function getHttpResponse($url, $timeout = 30, $maxBytes = 4194304, $curlWriteFunction = null)
+    {
+        return get_http_response($url, $timeout, $maxBytes, $curlWriteFunction);
+    }
+
+    public function getCurlDownloadCallback(
+        &$charset,
+        &$title,
+        &$description,
+        &$keywords,
+        $retrieveDescription,
+        $curlGetInfo = 'curl_getinfo'
+    ) {
+        return get_curl_download_callback(
+            $charset,
+            $title,
+            $description,
+            $keywords,
+            $retrieveDescription,
+            $curlGetInfo
+        );
+    }
+}
diff --git a/application/http/HttpUtils.php b/application/http/HttpUtils.php
index 2ea9195d..9f414073 100644
--- a/application/http/HttpUtils.php
+++ b/application/http/HttpUtils.php
@@ -369,7 +369,11 @@ function server_url($server)
  */
 function index_url($server)
 {
-    $scriptname = $server['SCRIPT_NAME'];
+    if (defined('SHAARLI_ROOT_URL') && null !== SHAARLI_ROOT_URL) {
+        return rtrim(SHAARLI_ROOT_URL, '/') . '/';
+    }
+
+    $scriptname = !empty($server['SCRIPT_NAME']) ? $server['SCRIPT_NAME'] : '/';
     if (endsWith($scriptname, 'index.php')) {
         $scriptname = substr($scriptname, 0, -9);
     }
@@ -377,7 +381,7 @@ function index_url($server)
 }
 
 /**
- * Returns the absolute URL of the current script, with the query
+ * Returns the absolute URL of the current script, with current route and query
  *
  * If the resource is "index.php", then it is removed (for better-looking URLs)
  *
@@ -387,10 +391,17 @@ function index_url($server)
  */
 function page_url($server)
 {
+    $scriptname = $server['SCRIPT_NAME'] ?? '';
+    if (endsWith($scriptname, 'index.php')) {
+        $scriptname = substr($scriptname, 0, -9);
+    }
+
+    $route = preg_replace('@^' . $scriptname . '@', '', $server['REQUEST_URI'] ?? '');
     if (! empty($server['QUERY_STRING'])) {
-        return index_url($server).'?'.$server['QUERY_STRING'];
+        return index_url($server) . $route . '?' . $server['QUERY_STRING'];
     }
-    return index_url($server);
+
+    return index_url($server) . $route;
 }
 
 /**
@@ -477,3 +488,109 @@ function is_https($server)
 
     return ! empty($server['HTTPS']);
 }
+
+/**
+ * Get cURL callback function for CURLOPT_WRITEFUNCTION
+ *
+ * @param string $charset     to extract from the downloaded page (reference)
+ * @param string $title       to extract from the downloaded page (reference)
+ * @param string $description to extract from the downloaded page (reference)
+ * @param string $keywords    to extract from the downloaded page (reference)
+ * @param bool   $retrieveDescription Automatically tries to retrieve description and keywords from HTML content
+ * @param string $curlGetInfo Optionally overrides curl_getinfo function
+ *
+ * @return Closure
+ */
+function get_curl_download_callback(
+    &$charset,
+    &$title,
+    &$description,
+    &$keywords,
+    $retrieveDescription,
+    $curlGetInfo = 'curl_getinfo'
+) {
+    $isRedirected = false;
+    $currentChunk = 0;
+    $foundChunk = null;
+
+    /**
+     * cURL callback function for CURLOPT_WRITEFUNCTION (called during the download).
+     *
+     * While downloading the remote page, we check that the HTTP code is 200 and content type is 'html/text'
+     * Then we extract the title and the charset and stop the download when it's done.
+     *
+     * @param resource $ch   cURL resource
+     * @param string   $data chunk of data being downloaded
+     *
+     * @return int|bool length of $data or false if we need to stop the download
+     */
+    return function (&$ch, $data) use (
+        $retrieveDescription,
+        $curlGetInfo,
+        &$charset,
+        &$title,
+        &$description,
+        &$keywords,
+        &$isRedirected,
+        &$currentChunk,
+        &$foundChunk
+    ) {
+        $currentChunk++;
+        $responseCode = $curlGetInfo($ch, CURLINFO_RESPONSE_CODE);
+        if (!empty($responseCode) && in_array($responseCode, [301, 302])) {
+            $isRedirected = true;
+            return strlen($data);
+        }
+        if (!empty($responseCode) && $responseCode !== 200) {
+            return false;
+        }
+        // After a redirection, the content type will keep the previous request value
+        // until it finds the next content-type header.
+        if (! $isRedirected || strpos(strtolower($data), 'content-type') !== false) {
+            $contentType = $curlGetInfo($ch, CURLINFO_CONTENT_TYPE);
+        }
+        if (!empty($contentType) && strpos($contentType, 'text/html') === false) {
+            return false;
+        }
+        if (!empty($contentType) && empty($charset)) {
+            $charset = header_extract_charset($contentType);
+        }
+        if (empty($charset)) {
+            $charset = html_extract_charset($data);
+        }
+        if (empty($title)) {
+            $title = html_extract_title($data);
+            $foundChunk = ! empty($title) ? $currentChunk : $foundChunk;
+        }
+        if ($retrieveDescription && empty($description)) {
+            $description = html_extract_tag('description', $data);
+            $foundChunk = ! empty($description) ? $currentChunk : $foundChunk;
+        }
+        if ($retrieveDescription && empty($keywords)) {
+            $keywords = html_extract_tag('keywords', $data);
+            if (! empty($keywords)) {
+                $foundChunk = $currentChunk;
+                // Keywords use the format tag1, tag2 multiple words, tag
+                // So we format them to match Shaarli's separator and glue multiple words with '-'
+                $keywords = implode(' ', array_map(function($keyword) {
+                    return implode('-', preg_split('/\s+/', trim($keyword)));
+                }, explode(',', $keywords)));
+            }
+        }
+
+        // We got everything we want, stop the download.
+        // If we already found either the title, description or keywords,
+        // it's highly unlikely that we'll found the other metas further than
+        // in the same chunk of data or the next one. So we also stop the download after that.
+        if ((!empty($responseCode) && !empty($contentType) && !empty($charset)) && $foundChunk !== null
+            && (! $retrieveDescription
+                || $foundChunk < $currentChunk
+                || (!empty($title) && !empty($description) && !empty($keywords))
+            )
+        ) {
+            return false;
+        }
+
+        return strlen($data);
+    };
+}
diff --git a/application/http/UrlUtils.php b/application/http/UrlUtils.php
index 4bc84b82..e8d1a283 100644
--- a/application/http/UrlUtils.php
+++ b/application/http/UrlUtils.php
@@ -73,7 +73,7 @@ function add_trailing_slash($url)
  */
 function whitelist_protocols($url, $protocols)
 {
-    if (startsWith($url, '?') || startsWith($url, '/')) {
+    if (startsWith($url, '?') || startsWith($url, '/') || startsWith($url, '#')) {
         return $url;
     }
     $protocols = array_merge(['http', 'https'], $protocols);
diff --git a/application/legacy/LegacyController.php b/application/legacy/LegacyController.php
new file mode 100644
index 00000000..826604e7
--- /dev/null
+++ b/application/legacy/LegacyController.php
@@ -0,0 +1,162 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Legacy;
+
+use Shaarli\Feed\FeedBuilder;
+use Shaarli\Front\Controller\Visitor\ShaarliVisitorController;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * We use this to maintain legacy routes, and redirect requests to the corresponding Slim route.
+ * Only public routes, and both `?addlink` and `?post` were kept here.
+ * Other routes will just display the linklist.
+ *
+ * @deprecated
+ */
+class LegacyController extends ShaarliVisitorController
+{
+    /** @var string[] Both `?post` and `?addlink` do not use `?do=` format. */
+    public const LEGACY_GET_ROUTES = [
+        'post',
+        'addlink',
+    ];
+
+    /**
+     * This method will call `$action` method, which will redirect to corresponding Slim route.
+     */
+    public function process(Request $request, Response $response, string $action): Response
+    {
+        if (!method_exists($this, $action)) {
+            throw new UnknowLegacyRouteException();
+        }
+
+        return $this->{$action}($request, $response);
+    }
+
+    /** Legacy route: ?post= */
+    public function post(Request $request, Response $response): Response
+    {
+        $route = '/admin/shaare';
+        $buildParameters = function (?array $parameters, bool $encode) {
+            if ($encode) {
+                $parameters = array_map('urlencode', $parameters);
+            }
+
+            return count($parameters) > 0 ? '?' . http_build_query($parameters) : '';
+        };
+
+
+        if (!$this->container->loginManager->isLoggedIn()) {
+            $parameters = $buildParameters($request->getQueryParams(), true);
+            return $this->redirect($response, '/login?returnurl='. $this->getBasePath() . $route . $parameters);
+        }
+
+        $parameters = $buildParameters($request->getQueryParams(), false);
+
+        return $this->redirect($response, $route . $parameters);
+    }
+
+    /** Legacy route: ?addlink= */
+    protected function addlink(Request $request, Response $response): Response
+    {
+        $route = '/admin/add-shaare';
+
+        if (!$this->container->loginManager->isLoggedIn()) {
+            return $this->redirect($response, '/login?returnurl=' . $this->getBasePath() . $route);
+        }
+
+        return $this->redirect($response, $route);
+    }
+
+    /** Legacy route: ?do=login */
+    protected function login(Request $request, Response $response): Response
+    {
+        $returnUrl = $request->getQueryParam('returnurl');
+
+        return $this->redirect($response, '/login' . ($returnUrl ? '?returnurl=' . $returnUrl : ''));
+    }
+
+    /** Legacy route: ?do=logout */
+    protected function logout(Request $request, Response $response): Response
+    {
+        return $this->redirect($response, '/admin/logout');
+    }
+
+    /** Legacy route: ?do=picwall */
+    protected function picwall(Request $request, Response $response): Response
+    {
+        return $this->redirect($response, '/picture-wall');
+    }
+
+    /** Legacy route: ?do=tagcloud */
+    protected function tagcloud(Request $request, Response $response): Response
+    {
+        return $this->redirect($response, '/tags/cloud');
+    }
+
+    /** Legacy route: ?do=taglist */
+    protected function taglist(Request $request, Response $response): Response
+    {
+        return $this->redirect($response, '/tags/list');
+    }
+
+    /** Legacy route: ?do=daily */
+    protected function daily(Request $request, Response $response): Response
+    {
+        $dayParam = !empty($request->getParam('day')) ? '?day=' . escape($request->getParam('day')) : '';
+
+        return $this->redirect($response, '/daily' . $dayParam);
+    }
+
+    /** Legacy route: ?do=rss */
+    protected function rss(Request $request, Response $response): Response
+    {
+        return $this->feed($request, $response, FeedBuilder::$FEED_RSS);
+    }
+
+    /** Legacy route: ?do=atom */
+    protected function atom(Request $request, Response $response): Response
+    {
+        return $this->feed($request, $response, FeedBuilder::$FEED_ATOM);
+    }
+
+    /** Legacy route: ?do=opensearch */
+    protected function opensearch(Request $request, Response $response): Response
+    {
+        return $this->redirect($response, '/open-search');
+    }
+
+    /** Legacy route: ?do=dailyrss */
+    protected function dailyrss(Request $request, Response $response): Response
+    {
+        return $this->redirect($response, '/daily-rss');
+    }
+
+    /** Legacy route: ?do=feed */
+    protected function feed(Request $request, Response $response, string $feedType): Response
+    {
+        $parameters = count($request->getQueryParams()) > 0 ? '?' . http_build_query($request->getQueryParams()) : '';
+
+        return $this->redirect($response, '/feed/' . $feedType . $parameters);
+    }
+
+    /** Legacy route: ?do=configure */
+    protected function configure(Request $request, Response $response): Response
+    {
+        $route = '/admin/configure';
+
+        if (!$this->container->loginManager->isLoggedIn()) {
+            return $this->redirect($response, '/login?returnurl=' . $this->getBasePath() . $route);
+        }
+
+        return $this->redirect($response, $route);
+    }
+
+    protected function getBasePath(): string
+    {
+        return $this->container->basePath ?: '';
+    }
+}
diff --git a/application/bookmark/LinkDB.php b/application/legacy/LegacyLinkDB.php
index 76ba95f0..7bf76fd4 100644
--- a/application/bookmark/LinkDB.php
+++ b/application/legacy/LegacyLinkDB.php
@@ -1,17 +1,18 @@
 <?php
 
-namespace Shaarli\Bookmark;
+namespace Shaarli\Legacy;
 
 use ArrayAccess;
 use Countable;
 use DateTime;
 use Iterator;
-use Shaarli\Bookmark\Exception\LinkNotFoundException;
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
 use Shaarli\Exceptions\IOException;
 use Shaarli\FileUtils;
+use Shaarli\Render\PageCacheManager;
 
 /**
- * Data storage for links.
+ * Data storage for bookmarks.
  *
  * This object behaves like an associative array.
  *
@@ -29,8 +30,8 @@ use Shaarli\FileUtils;
  *  - private:  Is this link private? 0=no, other value=yes
  *  - tags:     tags attached to this entry (separated by spaces)
  *  - title     Title of the link
- *  - url       URL of the link. Used for displayable links.
- *              Can be absolute or relative in the database but the relative links
+ *  - url       URL of the link. Used for displayable bookmarks.
+ *              Can be absolute or relative in the database but the relative bookmarks
  *              will be converted to absolute ones in templates.
  *  - real_url  Raw URL in stored in the DB (absolute or relative).
  *  - shorturl  Permalink smallhash
@@ -49,11 +50,13 @@ use Shaarli\FileUtils;
  *   Example:
  *     - DB: link #1 (2010-01-01) link #2 (2016-01-01)
  *     - Order: #2 #1
- *     - Import links containing: link #3 (2013-01-01)
+ *     - Import bookmarks containing: link #3 (2013-01-01)
  *     - New DB: link #1 (2010-01-01) link #2 (2016-01-01) link #3 (2013-01-01)
  *     - Real order: #2 #3 #1
+ *
+ * @deprecated
  */
-class LinkDB implements Iterator, Countable, ArrayAccess
+class LegacyLinkDB implements Iterator, Countable, ArrayAccess
 {
     // Links are stored as a PHP serialized string
     private $datastore;
@@ -61,7 +64,7 @@ class LinkDB implements Iterator, Countable, ArrayAccess
     // Link date storage format
     const LINK_DATE_FORMAT = 'Ymd_His';
 
-    // List of links (associative array)
+    // List of bookmarks (associative array)
     //  - key:   link date (e.g. "20110823_124546"),
     //  - value: associative array (keys: title, description...)
     private $links;
@@ -71,7 +74,7 @@ class LinkDB implements Iterator, Countable, ArrayAccess
     private $urls;
 
     /**
-     * @var array List of all links IDS mapped with their array offset.
+     * @var array List of all bookmarks IDS mapped with their array offset.
      *            Map: id->offset.
      */
     protected $ids;
@@ -82,10 +85,10 @@ class LinkDB implements Iterator, Countable, ArrayAccess
     // Position in the $this->keys array (for the Iterator interface)
     private $position;
 
-    // Is the user logged in? (used to filter private links)
+    // Is the user logged in? (used to filter private bookmarks)
     private $loggedIn;
 
-    // Hide public links
+    // Hide public bookmarks
     private $hidePublicLinks;
 
     /**
@@ -95,7 +98,7 @@ class LinkDB implements Iterator, Countable, ArrayAccess
      *
      * @param string  $datastore        datastore file path.
      * @param boolean $isLoggedIn       is the user logged in?
-     * @param boolean $hidePublicLinks  if true all links are private.
+     * @param boolean $hidePublicLinks  if true all bookmarks are private.
      */
     public function __construct(
         $datastore,
@@ -280,7 +283,7 @@ You use the community supported version of the original Shaarli project, by Seba
      */
     private function read()
     {
-        // Public links are hidden and user not logged in => nothing to show
+        // Public bookmarks are hidden and user not logged in => nothing to show
         if ($this->hidePublicLinks && !$this->loggedIn) {
             $this->links = array();
             return;
@@ -310,7 +313,7 @@ You use the community supported version of the original Shaarli project, by Seba
 
             $link['sticky'] = isset($link['sticky']) ? $link['sticky'] : false;
 
-            // To be able to load links before running the update, and prepare the update
+            // To be able to load bookmarks before running the update, and prepare the update
             if (!isset($link['created'])) {
                 $link['id'] = $link['linkdate'];
                 $link['created'] = DateTime::createFromFormat(self::LINK_DATE_FORMAT, $link['linkdate']);
@@ -350,7 +353,8 @@ You use the community supported version of the original Shaarli project, by Seba
 
         $this->write();
 
-        invalidateCaches($pageCacheDir);
+        $pageCacheManager = new PageCacheManager($pageCacheDir, $this->loggedIn);
+        $pageCacheManager->invalidateCaches();
     }
 
     /**
@@ -375,13 +379,13 @@ You use the community supported version of the original Shaarli project, by Seba
      *
      * @return array $filtered array containing permalink data.
      *
-     * @throws LinkNotFoundException if the smallhash is malformed or doesn't match any link.
+     * @throws BookmarkNotFoundException if the smallhash is malformed or doesn't match any link.
      */
     public function filterHash($request)
     {
         $request = substr($request, 0, 6);
-        $linkFilter = new LinkFilter($this->links);
-        return $linkFilter->filter(LinkFilter::$FILTER_HASH, $request);
+        $linkFilter = new LegacyLinkFilter($this->links);
+        return $linkFilter->filter(LegacyLinkFilter::$FILTER_HASH, $request);
     }
 
     /**
@@ -393,21 +397,21 @@ You use the community supported version of the original Shaarli project, by Seba
      */
     public function filterDay($request)
     {
-        $linkFilter = new LinkFilter($this->links);
-        return $linkFilter->filter(LinkFilter::$FILTER_DAY, $request);
+        $linkFilter = new LegacyLinkFilter($this->links);
+        return $linkFilter->filter(LegacyLinkFilter::$FILTER_DAY, $request);
     }
 
     /**
-     * Filter links according to search parameters.
+     * Filter bookmarks according to search parameters.
      *
      * @param array  $filterRequest  Search request content. Supported keys:
      *                                - searchtags: list of tags
      *                                - searchterm: term search
      * @param bool   $casesensitive  Optional: Perform case sensitive filter
-     * @param string $visibility     return only all/private/public links
-     * @param bool   $untaggedonly   return only untagged links
+     * @param string $visibility     return only all/private/public bookmarks
+     * @param bool   $untaggedonly   return only untagged bookmarks
      *
-     * @return array filtered links, all links if no suitable filter was provided.
+     * @return array filtered bookmarks, all bookmarks if no suitable filter was provided.
      */
     public function filterSearch(
         $filterRequest = array(),
@@ -420,19 +424,19 @@ You use the community supported version of the original Shaarli project, by Seba
         $searchtags = isset($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : '';
         $searchterm = isset($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : '';
 
-        // Search tags + fullsearch - blank string parameter will return all links.
-        $type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT; // == "vuotext"
+        // Search tags + fullsearch - blank string parameter will return all bookmarks.
+        $type = LegacyLinkFilter::$FILTER_TAG | LegacyLinkFilter::$FILTER_TEXT; // == "vuotext"
         $request = [$searchtags, $searchterm];
 
-        $linkFilter = new LinkFilter($this);
+        $linkFilter = new LegacyLinkFilter($this);
         return $linkFilter->filter($type, $request, $casesensitive, $visibility, $untaggedonly);
     }
 
     /**
-     * Returns the list tags appearing in the links with the given tags
+     * Returns the list tags appearing in the bookmarks with the given tags
      *
-     * @param array  $filteringTags tags selecting the links to consider
-     * @param string $visibility    process only all/private/public links
+     * @param array  $filteringTags tags selecting the bookmarks to consider
+     * @param string $visibility    process only all/private/public bookmarks
      *
      * @return array tag => linksCount
      */
@@ -471,12 +475,12 @@ You use the community supported version of the original Shaarli project, by Seba
     }
 
     /**
-     * Rename or delete a tag across all links.
+     * Rename or delete a tag across all bookmarks.
      *
      * @param string $from Tag to rename
      * @param string $to   New tag. If none is provided, the from tag will be deleted
      *
-     * @return array|bool List of altered links or false on error
+     * @return array|bool List of altered bookmarks or false on error
      */
     public function renameTag($from, $to)
     {
@@ -519,7 +523,7 @@ You use the community supported version of the original Shaarli project, by Seba
     }
 
     /**
-     * Reorder links by creation date (newest first).
+     * Reorder bookmarks by creation date (newest first).
      *
      * Also update the urls and ids mapping arrays.
      *
@@ -533,6 +537,9 @@ You use the community supported version of the original Shaarli project, by Seba
             if (isset($a['sticky']) && isset($b['sticky']) && $a['sticky'] !== $b['sticky']) {
                 return $a['sticky'] ? -1 : 1;
             }
+            if ($a['created'] == $b['created']) {
+                return $a['id'] < $b['id'] ? 1 * $order : -1 * $order;
+            }
             return $a['created'] < $b['created'] ? 1 * $order : -1 * $order;
         });
 
@@ -559,7 +566,7 @@ You use the community supported version of the original Shaarli project, by Seba
     }
 
     /**
-     * Returns a link offset in links array from its unique ID.
+     * Returns a link offset in bookmarks array from its unique ID.
      *
      * @param int $id Persistent ID of a link.
      *
diff --git a/application/bookmark/LinkFilter.php b/application/legacy/LegacyLinkFilter.php
index 9b966307..7cf93d60 100644
--- a/application/bookmark/LinkFilter.php
+++ b/application/legacy/LegacyLinkFilter.php
@@ -1,16 +1,18 @@
 <?php
 
-namespace Shaarli\Bookmark;
+namespace Shaarli\Legacy;
 
 use Exception;
-use Shaarli\Bookmark\Exception\LinkNotFoundException;
+use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
 
 /**
  * Class LinkFilter.
  *
  * Perform search and filter operation on link data list.
+ *
+ * @deprecated
  */
-class LinkFilter
+class LegacyLinkFilter
 {
     /**
      * @var string permalinks.
@@ -38,12 +40,12 @@ class LinkFilter
     public static $HASHTAG_CHARS = '\p{Pc}\p{N}\p{L}\p{Mn}';
 
     /**
-     * @var LinkDB all available links.
+     * @var LegacyLinkDB all available links.
      */
     private $links;
 
     /**
-     * @param LinkDB $links initialization.
+     * @param LegacyLinkDB $links initialization.
      */
     public function __construct($links)
     {
@@ -84,10 +86,10 @@ class LinkFilter
                     $filtered = $this->links;
                 }
                 if (!empty($request[0])) {
-                    $filtered = (new LinkFilter($filtered))->filterTags($request[0], $casesensitive, $visibility);
+                    $filtered = (new LegacyLinkFilter($filtered))->filterTags($request[0], $casesensitive, $visibility);
                 }
                 if (!empty($request[1])) {
-                    $filtered = (new LinkFilter($filtered))->filterFulltext($request[1], $visibility);
+                    $filtered = (new LegacyLinkFilter($filtered))->filterFulltext($request[1], $visibility);
                 }
                 return $filtered;
             case self::$FILTER_TEXT:
@@ -137,7 +139,7 @@ class LinkFilter
      *
      * @return array $filtered array containing permalink data.
      *
-     * @throws \Shaarli\Bookmark\Exception\LinkNotFoundException if the smallhash doesn't match any link.
+     * @throws BookmarkNotFoundException if the smallhash doesn't match any link.
      */
     private function filterSmallHash($smallHash)
     {
@@ -151,7 +153,7 @@ class LinkFilter
         }
 
         if (empty($filtered)) {
-            throw new LinkNotFoundException();
+            throw new BookmarkNotFoundException();
         }
 
         return $filtered;
diff --git a/application/legacy/LegacyRouter.php b/application/legacy/LegacyRouter.php
new file mode 100644
index 00000000..0449c7e1
--- /dev/null
+++ b/application/legacy/LegacyRouter.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace Shaarli\Legacy;
+
+/**
+ * Class Router
+ *
+ * (only displayable pages here)
+ *
+ * @deprecated
+ */
+class LegacyRouter
+{
+    public static $AJAX_THUMB_UPDATE = 'ajax_thumb_update';
+
+    public static $PAGE_LOGIN = 'login';
+
+    public static $PAGE_PICWALL = 'picwall';
+
+    public static $PAGE_TAGCLOUD = 'tag.cloud';
+
+    public static $PAGE_TAGLIST = 'tag.list';
+
+    public static $PAGE_DAILY = 'daily';
+
+    public static $PAGE_FEED_ATOM = 'feed.atom';
+
+    public static $PAGE_FEED_RSS = 'feed.rss';
+
+    public static $PAGE_TOOLS = 'tools';
+
+    public static $PAGE_CHANGEPASSWORD = 'changepasswd';
+
+    public static $PAGE_CONFIGURE = 'configure';
+
+    public static $PAGE_CHANGETAG = 'changetag';
+
+    public static $PAGE_ADDLINK = 'addlink';
+
+    public static $PAGE_EDITLINK = 'editlink';
+
+    public static $PAGE_DELETELINK = 'delete_link';
+
+    public static $PAGE_CHANGE_VISIBILITY = 'change_visibility';
+
+    public static $PAGE_PINLINK = 'pin';
+
+    public static $PAGE_EXPORT = 'export';
+
+    public static $PAGE_IMPORT = 'import';
+
+    public static $PAGE_OPENSEARCH = 'opensearch';
+
+    public static $PAGE_LINKLIST = 'linklist';
+
+    public static $PAGE_PLUGINSADMIN = 'pluginadmin';
+
+    public static $PAGE_SAVE_PLUGINSADMIN = 'save_pluginadmin';
+
+    public static $PAGE_THUMBS_UPDATE = 'thumbs_update';
+
+    public static $GET_TOKEN = 'token';
+}
diff --git a/application/legacy/LegacyUpdater.php b/application/legacy/LegacyUpdater.php
new file mode 100644
index 00000000..0ab3a55b
--- /dev/null
+++ b/application/legacy/LegacyUpdater.php
@@ -0,0 +1,618 @@
+<?php
+
+namespace Shaarli\Legacy;
+
+use Exception;
+use RainTPL;
+use ReflectionClass;
+use ReflectionException;
+use ReflectionMethod;
+use Shaarli\ApplicationUtils;
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Bookmark\BookmarkArray;
+use Shaarli\Bookmark\BookmarkFilter;
+use Shaarli\Bookmark\BookmarkIO;
+use Shaarli\Bookmark\LinkDB;
+use Shaarli\Config\ConfigJson;
+use Shaarli\Config\ConfigManager;
+use Shaarli\Config\ConfigPhp;
+use Shaarli\Exceptions\IOException;
+use Shaarli\Thumbnailer;
+use Shaarli\Updater\Exception\UpdaterException;
+
+/**
+ * Class updater.
+ * Used to update stuff when a new Shaarli's version is reached.
+ * Update methods are ran only once, and the stored in a JSON file.
+ *
+ * @deprecated
+ */
+class LegacyUpdater
+{
+    /**
+     * @var array Updates which are already done.
+     */
+    protected $doneUpdates;
+
+    /**
+     * @var LegacyLinkDB instance.
+     */
+    protected $linkDB;
+
+    /**
+     * @var ConfigManager $conf Configuration Manager instance.
+     */
+    protected $conf;
+
+    /**
+     * @var bool True if the user is logged in, false otherwise.
+     */
+    protected $isLoggedIn;
+
+    /**
+     * @var array $_SESSION
+     */
+    protected $session;
+
+    /**
+     * @var ReflectionMethod[] List of current class methods.
+     */
+    protected $methods;
+
+    /**
+     * Object constructor.
+     *
+     * @param array         $doneUpdates Updates which are already done.
+     * @param LegacyLinkDB  $linkDB      LinkDB instance.
+     * @param ConfigManager $conf        Configuration Manager instance.
+     * @param boolean       $isLoggedIn  True if the user is logged in.
+     * @param array         $session     $_SESSION (by reference)
+     *
+     * @throws ReflectionException
+     */
+    public function __construct($doneUpdates, $linkDB, $conf, $isLoggedIn, &$session = [])
+    {
+        $this->doneUpdates = $doneUpdates;
+        $this->linkDB = $linkDB;
+        $this->conf = $conf;
+        $this->isLoggedIn = $isLoggedIn;
+        $this->session = &$session;
+
+        // Retrieve all update methods.
+        $class = new ReflectionClass($this);
+        $this->methods = $class->getMethods();
+    }
+
+    /**
+     * Run all new updates.
+     * Update methods have to start with 'updateMethod' and return true (on success).
+     *
+     * @return array An array containing ran updates.
+     *
+     * @throws UpdaterException If something went wrong.
+     */
+    public function update()
+    {
+        $updatesRan = array();
+
+        // If the user isn't logged in, exit without updating.
+        if ($this->isLoggedIn !== true) {
+            return $updatesRan;
+        }
+
+        if ($this->methods === null) {
+            throw new UpdaterException(t('Couldn\'t retrieve updater class methods.'));
+        }
+
+        foreach ($this->methods as $method) {
+            // Not an update method or already done, pass.
+            if (!startsWith($method->getName(), 'updateMethod')
+                || in_array($method->getName(), $this->doneUpdates)
+            ) {
+                continue;
+            }
+
+            try {
+                $method->setAccessible(true);
+                $res = $method->invoke($this);
+                // Update method must return true to be considered processed.
+                if ($res === true) {
+                    $updatesRan[] = $method->getName();
+                }
+            } catch (Exception $e) {
+                throw new UpdaterException($method, $e);
+            }
+        }
+
+        $this->doneUpdates = array_merge($this->doneUpdates, $updatesRan);
+
+        return $updatesRan;
+    }
+
+    /**
+     * @return array Updates methods already processed.
+     */
+    public function getDoneUpdates()
+    {
+        return $this->doneUpdates;
+    }
+
+    /**
+     * Move deprecated options.php to config.php.
+     *
+     * Milestone 0.9 (old versioning) - shaarli/Shaarli#41:
+     *    options.php is not supported anymore.
+     */
+    public function updateMethodMergeDeprecatedConfigFile()
+    {
+        if (is_file($this->conf->get('resource.data_dir') . '/options.php')) {
+            include $this->conf->get('resource.data_dir') . '/options.php';
+
+            // Load GLOBALS into config
+            $allowedKeys = array_merge(ConfigPhp::$ROOT_KEYS);
+            $allowedKeys[] = 'config';
+            foreach ($GLOBALS as $key => $value) {
+                if (in_array($key, $allowedKeys)) {
+                    $this->conf->set($key, $value);
+                }
+            }
+            $this->conf->write($this->isLoggedIn);
+            unlink($this->conf->get('resource.data_dir') . '/options.php');
+        }
+
+        return true;
+    }
+
+    /**
+     * Move old configuration in PHP to the new config system in JSON format.
+     *
+     * Will rename 'config.php' into 'config.save.php' and create 'config.json.php'.
+     * It will also convert legacy setting keys to the new ones.
+     */
+    public function updateMethodConfigToJson()
+    {
+        // JSON config already exists, nothing to do.
+        if ($this->conf->getConfigIO() instanceof ConfigJson) {
+            return true;
+        }
+
+        $configPhp = new ConfigPhp();
+        $configJson = new ConfigJson();
+        $oldConfig = $configPhp->read($this->conf->getConfigFile() . '.php');
+        rename($this->conf->getConfigFileExt(), $this->conf->getConfigFile() . '.save.php');
+        $this->conf->setConfigIO($configJson);
+        $this->conf->reload();
+
+        $legacyMap = array_flip(ConfigPhp::$LEGACY_KEYS_MAPPING);
+        foreach (ConfigPhp::$ROOT_KEYS as $key) {
+            $this->conf->set($legacyMap[$key], $oldConfig[$key]);
+        }
+
+        // Set sub config keys (config and plugins)
+        $subConfig = array('config', 'plugins');
+        foreach ($subConfig as $sub) {
+            foreach ($oldConfig[$sub] as $key => $value) {
+                if (isset($legacyMap[$sub . '.' . $key])) {
+                    $configKey = $legacyMap[$sub . '.' . $key];
+                } else {
+                    $configKey = $sub . '.' . $key;
+                }
+                $this->conf->set($configKey, $value);
+            }
+        }
+
+        try {
+            $this->conf->write($this->isLoggedIn);
+            return true;
+        } catch (IOException $e) {
+            error_log($e->getMessage());
+            return false;
+        }
+    }
+
+    /**
+     * Escape settings which have been manually escaped in every request in previous versions:
+     *   - general.title
+     *   - general.header_link
+     *   - redirector.url
+     *
+     * @return bool true if the update is successful, false otherwise.
+     */
+    public function updateMethodEscapeUnescapedConfig()
+    {
+        try {
+            $this->conf->set('general.title', escape($this->conf->get('general.title')));
+            $this->conf->set('general.header_link', escape($this->conf->get('general.header_link')));
+            $this->conf->write($this->isLoggedIn);
+        } catch (Exception $e) {
+            error_log($e->getMessage());
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Update the database to use the new ID system, which replaces linkdate primary keys.
+     * Also, creation and update dates are now DateTime objects (done by LinkDB).
+     *
+     * Since this update is very sensitve (changing the whole database), the datastore will be
+     * automatically backed up into the file datastore.<datetime>.php.
+     *
+     * LinkDB also adds the field 'shorturl' with the precedent format (linkdate smallhash),
+     * which will be saved by this method.
+     *
+     * @return bool true if the update is successful, false otherwise.
+     */
+    public function updateMethodDatastoreIds()
+    {
+        $first = 'update';
+        foreach ($this->linkDB as $key => $link) {
+            $first = $key;
+            break;
+        }
+
+        // up to date database
+        if (is_int($first)) {
+            return true;
+        }
+
+        $save = $this->conf->get('resource.data_dir') . '/datastore.' . date('YmdHis') . '.php';
+        copy($this->conf->get('resource.datastore'), $save);
+
+        $links = array();
+        foreach ($this->linkDB as $offset => $value) {
+            $links[] = $value;
+            unset($this->linkDB[$offset]);
+        }
+        $links = array_reverse($links);
+        $cpt = 0;
+        foreach ($links as $l) {
+            unset($l['linkdate']);
+            $l['id'] = $cpt;
+            $this->linkDB[$cpt++] = $l;
+        }
+
+        $this->linkDB->save($this->conf->get('resource.page_cache'));
+        $this->linkDB->reorder();
+
+        return true;
+    }
+
+    /**
+     * Rename tags starting with a '-' to work with tag exclusion search.
+     */
+    public function updateMethodRenameDashTags()
+    {
+        $linklist = $this->linkDB->filterSearch();
+        foreach ($linklist as $key => $link) {
+            $link['tags'] = preg_replace('/(^| )\-/', '$1', $link['tags']);
+            $link['tags'] = implode(' ', array_unique(BookmarkFilter::tagsStrToArray($link['tags'], true)));
+            $this->linkDB[$key] = $link;
+        }
+        $this->linkDB->save($this->conf->get('resource.page_cache'));
+        return true;
+    }
+
+    /**
+     * Initialize API settings:
+     *   - api.enabled: true
+     *   - api.secret: generated secret
+     */
+    public function updateMethodApiSettings()
+    {
+        if ($this->conf->exists('api.secret')) {
+            return true;
+        }
+
+        $this->conf->set('api.enabled', true);
+        $this->conf->set(
+            'api.secret',
+            generate_api_secret(
+                $this->conf->get('credentials.login'),
+                $this->conf->get('credentials.salt')
+            )
+        );
+        $this->conf->write($this->isLoggedIn);
+        return true;
+    }
+
+    /**
+     * New setting: theme name. If the default theme is used, nothing to do.
+     *
+     * If the user uses a custom theme, raintpl_tpl dir is updated to the parent directory,
+     * and the current theme is set as default in the theme setting.
+     *
+     * @return bool true if the update is successful, false otherwise.
+     */
+    public function updateMethodDefaultTheme()
+    {
+        // raintpl_tpl isn't the root template directory anymore.
+        // We run the update only if this folder still contains the template files.
+        $tplDir = $this->conf->get('resource.raintpl_tpl');
+        $tplFile = $tplDir . '/linklist.html';
+        if (!file_exists($tplFile)) {
+            return true;
+        }
+
+        $parent = dirname($tplDir);
+        $this->conf->set('resource.raintpl_tpl', $parent);
+        $this->conf->set('resource.theme', trim(str_replace($parent, '', $tplDir), '/'));
+        $this->conf->write($this->isLoggedIn);
+
+        // Dependency injection gore
+        RainTPL::$tpl_dir = $tplDir;
+
+        return true;
+    }
+
+    /**
+     * Move the file to inc/user.css to data/user.css.
+     *
+     * Note: Due to hardcoded paths, it's not unit testable. But one line of code should be fine.
+     *
+     * @return bool true if the update is successful, false otherwise.
+     */
+    public function updateMethodMoveUserCss()
+    {
+        if (!is_file('inc/user.css')) {
+            return true;
+        }
+
+        return rename('inc/user.css', 'data/user.css');
+    }
+
+    /**
+     * * `markdown_escape` is a new setting, set to true as default.
+     *
+     * If the markdown plugin was already enabled, escaping is disabled to avoid
+     * breaking existing entries.
+     */
+    public function updateMethodEscapeMarkdown()
+    {
+        if ($this->conf->exists('security.markdown_escape')) {
+            return true;
+        }
+
+        if (in_array('markdown', $this->conf->get('general.enabled_plugins'))) {
+            $this->conf->set('security.markdown_escape', false);
+        } else {
+            $this->conf->set('security.markdown_escape', true);
+        }
+        $this->conf->write($this->isLoggedIn);
+
+        return true;
+    }
+
+    /**
+     * Add 'http://' to Piwik URL the setting is set.
+     *
+     * @return bool true if the update is successful, false otherwise.
+     */
+    public function updateMethodPiwikUrl()
+    {
+        if (!$this->conf->exists('plugins.PIWIK_URL') || startsWith($this->conf->get('plugins.PIWIK_URL'), 'http')) {
+            return true;
+        }
+
+        $this->conf->set('plugins.PIWIK_URL', 'http://' . $this->conf->get('plugins.PIWIK_URL'));
+        $this->conf->write($this->isLoggedIn);
+
+        return true;
+    }
+
+    /**
+     * Use ATOM feed as default.
+     */
+    public function updateMethodAtomDefault()
+    {
+        if (!$this->conf->exists('feed.show_atom') || $this->conf->get('feed.show_atom') === true) {
+            return true;
+        }
+
+        $this->conf->set('feed.show_atom', true);
+        $this->conf->write($this->isLoggedIn);
+
+        return true;
+    }
+
+    /**
+     * Update updates.check_updates_branch setting.
+     *
+     * If the current major version digit matches the latest branch
+     * major version digit, we set the branch to `latest`,
+     * otherwise we'll check updates on the `stable` branch.
+     *
+     * No update required for the dev version.
+     *
+     * Note: due to hardcoded URL and lack of dependency injection, this is not unit testable.
+     *
+     * FIXME! This needs to be removed when we switch to first digit major version
+     *        instead of the second one since the versionning process will change.
+     */
+    public function updateMethodCheckUpdateRemoteBranch()
+    {
+        if (SHAARLI_VERSION === 'dev' || $this->conf->get('updates.check_updates_branch') === 'latest') {
+            return true;
+        }
+
+        // Get latest branch major version digit
+        $latestVersion = ApplicationUtils::getLatestGitVersionCode(
+            'https://raw.githubusercontent.com/shaarli/Shaarli/latest/shaarli_version.php',
+            5
+        );
+        if (preg_match('/(\d+)\.\d+$/', $latestVersion, $matches) === false) {
+            return false;
+        }
+        $latestMajor = $matches[1];
+
+        // Get current major version digit
+        preg_match('/(\d+)\.\d+$/', SHAARLI_VERSION, $matches);
+        $currentMajor = $matches[1];
+
+        if ($currentMajor === $latestMajor) {
+            $branch = 'latest';
+        } else {
+            $branch = 'stable';
+        }
+        $this->conf->set('updates.check_updates_branch', $branch);
+        $this->conf->write($this->isLoggedIn);
+        return true;
+    }
+
+    /**
+     * Reset history store file due to date format change.
+     */
+    public function updateMethodResetHistoryFile()
+    {
+        if (is_file($this->conf->get('resource.history'))) {
+            unlink($this->conf->get('resource.history'));
+        }
+        return true;
+    }
+
+    /**
+     * Save the datastore -> the link order is now applied when bookmarks are saved.
+     */
+    public function updateMethodReorderDatastore()
+    {
+        $this->linkDB->save($this->conf->get('resource.page_cache'));
+        return true;
+    }
+
+    /**
+     * Change privateonly session key to visibility.
+     */
+    public function updateMethodVisibilitySession()
+    {
+        if (isset($_SESSION['privateonly'])) {
+            unset($_SESSION['privateonly']);
+            $_SESSION['visibility'] = 'private';
+        }
+        return true;
+    }
+
+    /**
+     * Add download size and timeout to the configuration file
+     *
+     * @return bool true if the update is successful, false otherwise.
+     */
+    public function updateMethodDownloadSizeAndTimeoutConf()
+    {
+        if ($this->conf->exists('general.download_max_size')
+            && $this->conf->exists('general.download_timeout')
+        ) {
+            return true;
+        }
+
+        if (!$this->conf->exists('general.download_max_size')) {
+            $this->conf->set('general.download_max_size', 1024 * 1024 * 4);
+        }
+
+        if (!$this->conf->exists('general.download_timeout')) {
+            $this->conf->set('general.download_timeout', 30);
+        }
+
+        $this->conf->write($this->isLoggedIn);
+        return true;
+    }
+
+    /**
+     * * Move thumbnails management to WebThumbnailer, coming with new settings.
+     */
+    public function updateMethodWebThumbnailer()
+    {
+        if ($this->conf->exists('thumbnails.mode')) {
+            return true;
+        }
+
+        $thumbnailsEnabled = extension_loaded('gd') && $this->conf->get('thumbnail.enable_thumbnails', true);
+        $this->conf->set('thumbnails.mode', $thumbnailsEnabled ? Thumbnailer::MODE_ALL : Thumbnailer::MODE_NONE);
+        $this->conf->set('thumbnails.width', 125);
+        $this->conf->set('thumbnails.height', 90);
+        $this->conf->remove('thumbnail');
+        $this->conf->write(true);
+
+        if ($thumbnailsEnabled) {
+            $this->session['warnings'][] = t(
+                t('You have enabled or changed thumbnails mode.') .
+                '<a href="./admin/thumbnails">' . t('Please synchronize them.') . '</a>'
+            );
+        }
+
+        return true;
+    }
+
+    /**
+     * Set sticky = false on all bookmarks
+     *
+     * @return bool true if the update is successful, false otherwise.
+     */
+    public function updateMethodSetSticky()
+    {
+        foreach ($this->linkDB as $key => $link) {
+            if (isset($link['sticky'])) {
+                return true;
+            }
+            $link['sticky'] = false;
+            $this->linkDB[$key] = $link;
+        }
+
+        $this->linkDB->save($this->conf->get('resource.page_cache'));
+
+        return true;
+    }
+
+    /**
+     * Remove redirector settings.
+     */
+    public function updateMethodRemoveRedirector()
+    {
+        $this->conf->remove('redirector');
+        $this->conf->write(true);
+        return true;
+    }
+
+    /**
+     * Migrate the legacy arrays to Bookmark objects.
+     * Also make a backup of the datastore.
+     */
+    public function updateMethodMigrateDatabase()
+    {
+        $save = $this->conf->get('resource.data_dir') . '/datastore.' . date('YmdHis') . '_1.php';
+        if (! copy($this->conf->get('resource.datastore'), $save)) {
+            die('Could not backup the datastore.');
+        }
+
+        $linksArray = new BookmarkArray();
+        foreach ($this->linkDB as $key => $link) {
+            $linksArray[$key] = (new Bookmark())->fromArray($link);
+        }
+        $linksIo = new BookmarkIO($this->conf);
+        $linksIo->write($linksArray);
+
+        return true;
+    }
+
+    /**
+     * Write the `formatter` setting in config file.
+     * Use markdown if the markdown plugin is enabled, the default one otherwise.
+     * Also remove markdown plugin setting as it is now integrated to the core.
+     */
+    public function updateMethodFormatterSetting()
+    {
+        if (!$this->conf->exists('formatter') || $this->conf->get('formatter') === 'default') {
+            $enabledPlugins = $this->conf->get('general.enabled_plugins');
+            if (($pos = array_search('markdown', $enabledPlugins)) !== false) {
+                $formatter = 'markdown';
+                unset($enabledPlugins[$pos]);
+                $this->conf->set('general.enabled_plugins', array_values($enabledPlugins));
+            } else {
+                $formatter = 'default';
+            }
+            $this->conf->set('formatter', $formatter);
+            $this->conf->write(true);
+        }
+
+        return true;
+    }
+}
diff --git a/application/legacy/UnknowLegacyRouteException.php b/application/legacy/UnknowLegacyRouteException.php
new file mode 100644
index 00000000..ae1518ad
--- /dev/null
+++ b/application/legacy/UnknowLegacyRouteException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Legacy;
+
+class UnknowLegacyRouteException extends \Exception
+{
+}
diff --git a/application/netscape/NetscapeBookmarkUtils.php b/application/netscape/NetscapeBookmarkUtils.php
index 28665941..b83f16f8 100644
--- a/application/netscape/NetscapeBookmarkUtils.php
+++ b/application/netscape/NetscapeBookmarkUtils.php
@@ -6,56 +6,69 @@ use DateTime;
 use DateTimeZone;
 use Exception;
 use Katzgrau\KLogger\Logger;
+use Psr\Http\Message\UploadedFileInterface;
 use Psr\Log\LogLevel;
-use Shaarli\Bookmark\LinkDB;
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Bookmark\BookmarkServiceInterface;
 use Shaarli\Config\ConfigManager;
+use Shaarli\Formatter\BookmarkFormatter;
 use Shaarli\History;
 use Shaarli\NetscapeBookmarkParser\NetscapeBookmarkParser;
 
 /**
  * Utilities to import and export bookmarks using the Netscape format
- * TODO: Not static, use a container.
  */
 class NetscapeBookmarkUtils
 {
+    /** @var BookmarkServiceInterface */
+    protected $bookmarkService;
+
+    /** @var ConfigManager */
+    protected $conf;
+
+    /** @var History */
+    protected $history;
+
+    public function __construct(BookmarkServiceInterface $bookmarkService, ConfigManager $conf, History $history)
+    {
+        $this->bookmarkService = $bookmarkService;
+        $this->conf = $conf;
+        $this->history = $history;
+    }
 
     /**
-     * Filters links and adds Netscape-formatted fields
+     * Filters bookmarks and adds Netscape-formatted fields
      *
      * Added fields:
      * - timestamp  link addition date, using the Unix epoch format
      * - taglist    comma-separated tag list
      *
-     * @param LinkDB $linkDb         Link datastore
-     * @param string $selection      Which links to export: (all|private|public)
-     * @param bool   $prependNoteUrl Prepend note permalinks with the server's URL
-     * @param string $indexUrl       Absolute URL of the Shaarli index page
+     * @param BookmarkFormatter        $formatter       instance
+     * @param string                   $selection       Which bookmarks to export: (all|private|public)
+     * @param bool                     $prependNoteUrl  Prepend note permalinks with the server's URL
+     * @param string                   $indexUrl        Absolute URL of the Shaarli index page
      *
-     * @throws Exception Invalid export selection
+     * @return array The bookmarks to be exported, with additional fields
      *
-     * @return array The links to be exported, with additional fields
+     * @throws Exception Invalid export selection
      */
-    public static function filterAndFormat($linkDb, $selection, $prependNoteUrl, $indexUrl)
-    {
+    public function filterAndFormat(
+        $formatter,
+        $selection,
+        $prependNoteUrl,
+        $indexUrl
+    ) {
         // see tpl/export.html for possible values
         if (!in_array($selection, array('all', 'public', 'private'))) {
             throw new Exception(t('Invalid export selection:') . ' "' . $selection . '"');
         }
 
         $bookmarkLinks = array();
-        foreach ($linkDb as $link) {
-            if ($link['private'] != 0 && $selection == 'public') {
-                continue;
-            }
-            if ($link['private'] == 0 && $selection == 'private') {
-                continue;
-            }
-            $date = $link['created'];
-            $link['timestamp'] = $date->getTimestamp();
-            $link['taglist'] = str_replace(' ', ',', $link['tags']);
-
-            if (is_note($link['url']) && $prependNoteUrl) {
-                $link['url'] = $indexUrl . $link['url'];
+        foreach ($this->bookmarkService->search([], $selection) as $bookmark) {
+            $link = $formatter->format($bookmark);
+            $link['taglist'] = implode(',', $bookmark->getTags());
+            if ($bookmark->isNote() && $prependNoteUrl) {
+                $link['url'] = rtrim($indexUrl, '/') . '/' . ltrim($link['url'], '/');
             }
 
             $bookmarkLinks[] = $link;
@@ -65,66 +78,28 @@ class NetscapeBookmarkUtils
     }
 
     /**
-     * Generates an import status summary
-     *
-     * @param string $filename       name of the file to import
-     * @param int    $filesize       size of the file to import
-     * @param int    $importCount    how many links were imported
-     * @param int    $overwriteCount how many links were overwritten
-     * @param int    $skipCount      how many links were skipped
-     * @param int    $duration       how many seconds did the import take
-     *
-     * @return string Summary of the bookmark import status
-     */
-    private static function importStatus(
-        $filename,
-        $filesize,
-        $importCount = 0,
-        $overwriteCount = 0,
-        $skipCount = 0,
-        $duration = 0
-    ) {
-        $status = sprintf(t('File %s (%d bytes) '), $filename, $filesize);
-        if ($importCount == 0 && $overwriteCount == 0 && $skipCount == 0) {
-            $status .= t('has an unknown file format. Nothing was imported.');
-        } else {
-            $status .= vsprintf(
-                t(
-                    'was successfully processed in %d seconds: '
-                    . '%d links imported, %d links overwritten, %d links skipped.'
-                ),
-                [$duration, $importCount, $overwriteCount, $skipCount]
-            );
-        }
-        return $status;
-    }
-
-    /**
      * Imports Web bookmarks from an uploaded Netscape bookmark dump
      *
-     * @param array         $post    Server $_POST parameters
-     * @param array         $files   Server $_FILES parameters
-     * @param LinkDB        $linkDb  Loaded LinkDB instance
-     * @param ConfigManager $conf    instance
-     * @param History       $history History instance
+     * @param array                 $post Server $_POST parameters
+     * @param UploadedFileInterface $file File in PSR-7 object format
      *
      * @return string Summary of the bookmark import status
      */
-    public static function import($post, $files, $linkDb, $conf, $history)
+    public function import($post, UploadedFileInterface $file)
     {
         $start = time();
-        $filename = $files['filetoupload']['name'];
-        $filesize = $files['filetoupload']['size'];
-        $data = file_get_contents($files['filetoupload']['tmp_name']);
+        $filename = $file->getClientFilename();
+        $filesize = $file->getSize();
+        $data = (string) $file->getStream();
 
         if (preg_match('/<!DOCTYPE NETSCAPE-Bookmark-file-1>/i', $data) === 0) {
-            return self::importStatus($filename, $filesize);
+            return $this->importStatus($filename, $filesize);
         }
 
-        // Overwrite existing links?
+        // Overwrite existing bookmarks?
         $overwrite = !empty($post['overwrite']);
 
-        // Add tags to all imported links?
+        // Add tags to all imported bookmarks?
         if (empty($post['default_tags'])) {
             $defaultTags = array();
         } else {
@@ -134,18 +109,18 @@ class NetscapeBookmarkUtils
             );
         }
 
-        // links are imported as public by default
+        // bookmarks are imported as public by default
         $defaultPrivacy = 0;
 
         $parser = new NetscapeBookmarkParser(
             true,                           // nested tag support
             $defaultTags,                   // additional user-specified tags
             strval(1 - $defaultPrivacy),    // defaultPub = 1 - defaultPrivacy
-            $conf->get('resource.data_dir') // log path, will be overridden
+            $this->conf->get('resource.data_dir') // log path, will be overridden
         );
         $logger = new Logger(
-            $conf->get('resource.data_dir'),
-            !$conf->get('dev.debug') ? LogLevel::INFO : LogLevel::DEBUG,
+            $this->conf->get('resource.data_dir'),
+            !$this->conf->get('dev.debug') ? LogLevel::INFO : LogLevel::DEBUG,
             [
                 'prefix' => 'import.',
                 'extension' => 'log',
@@ -164,22 +139,18 @@ class NetscapeBookmarkUtils
                 // use value from the imported file
                 $private = $bkm['pub'] == '1' ? 0 : 1;
             } elseif ($post['privacy'] == 'private') {
-                // all imported links are private
+                // all imported bookmarks are private
                 $private = 1;
             } elseif ($post['privacy'] == 'public') {
-                // all imported links are public
+                // all imported bookmarks are public
                 $private = 0;
             }
 
-            $newLink = array(
-                'title' => $bkm['title'],
-                'url' => $bkm['uri'],
-                'description' => $bkm['note'],
-                'private' => $private,
-                'tags' => $bkm['tags']
-            );
-
-            $existingLink = $linkDb->getLinkFromUrl($bkm['uri']);
+            $link = $this->bookmarkService->findByUrl($bkm['uri']);
+            $existingLink = $link !== null;
+            if (! $existingLink) {
+                $link = new Bookmark();
+            }
 
             if ($existingLink !== false) {
                 if ($overwrite === false) {
@@ -188,32 +159,30 @@ class NetscapeBookmarkUtils
                     continue;
                 }
 
-                // Overwrite an existing link, keep its date
-                $newLink['id'] = $existingLink['id'];
-                $newLink['created'] = $existingLink['created'];
-                $newLink['updated'] = new DateTime();
-                $newLink['shorturl'] = $existingLink['shorturl'];
-                $linkDb[$existingLink['id']] = $newLink;
-                $importCount++;
+                $link->setUpdated(new DateTime());
                 $overwriteCount++;
-                continue;
+            } else {
+                $newLinkDate = new DateTime('@' . strval($bkm['time']));
+                $newLinkDate->setTimezone(new DateTimeZone(date_default_timezone_get()));
+                $link->setCreated($newLinkDate);
             }
 
-            // Add a new link - @ used for UNIX timestamps
-            $newLinkDate = new DateTime('@' . strval($bkm['time']));
-            $newLinkDate->setTimezone(new DateTimeZone(date_default_timezone_get()));
-            $newLink['created'] = $newLinkDate;
-            $newLink['id'] = $linkDb->getNextId();
-            $newLink['shorturl'] = link_small_hash($newLink['created'], $newLink['id']);
-            $linkDb[$newLink['id']] = $newLink;
+            $link->setTitle($bkm['title']);
+            $link->setUrl($bkm['uri'], $this->conf->get('security.allowed_protocols'));
+            $link->setDescription($bkm['note']);
+            $link->setPrivate($private);
+            $link->setTagsString($bkm['tags']);
+
+            $this->bookmarkService->addOrSet($link, false);
             $importCount++;
         }
 
-        $linkDb->save($conf->get('resource.page_cache'));
-        $history->importLinks();
+        $this->bookmarkService->save();
+        $this->history->importLinks();
 
         $duration = time() - $start;
-        return self::importStatus(
+
+        return $this->importStatus(
             $filename,
             $filesize,
             $importCount,
@@ -222,4 +191,39 @@ class NetscapeBookmarkUtils
             $duration
         );
     }
+
+    /**
+     * Generates an import status summary
+     *
+     * @param string $filename       name of the file to import
+     * @param int    $filesize       size of the file to import
+     * @param int    $importCount    how many bookmarks were imported
+     * @param int    $overwriteCount how many bookmarks were overwritten
+     * @param int    $skipCount      how many bookmarks were skipped
+     * @param int    $duration       how many seconds did the import take
+     *
+     * @return string Summary of the bookmark import status
+     */
+    protected function importStatus(
+        $filename,
+        $filesize,
+        $importCount = 0,
+        $overwriteCount = 0,
+        $skipCount = 0,
+        $duration = 0
+    ) {
+        $status = sprintf(t('File %s (%d bytes) '), $filename, $filesize);
+        if ($importCount == 0 && $overwriteCount == 0 && $skipCount == 0) {
+            $status .= t('has an unknown file format. Nothing was imported.');
+        } else {
+            $status .= vsprintf(
+                t(
+                    'was successfully processed in %d seconds: '
+                    . '%d bookmarks imported, %d bookmarks overwritten, %d bookmarks skipped.'
+                ),
+                [$duration, $importCount, $overwriteCount, $skipCount]
+            );
+        }
+        return $status;
+    }
 }
diff --git a/application/plugin/PluginManager.php b/application/plugin/PluginManager.php
index f7b24a8e..1b2197c9 100644
--- a/application/plugin/PluginManager.php
+++ b/application/plugin/PluginManager.php
@@ -16,7 +16,7 @@ class PluginManager
      *
      * @var array $authorizedPlugins
      */
-    private $authorizedPlugins;
+    private $authorizedPlugins = [];
 
     /**
      * List of loaded plugins.
@@ -100,21 +100,35 @@ class PluginManager
      */
     public function executeHooks($hook, &$data, $params = array())
     {
-        if (!empty($params['target'])) {
-            $data['_PAGE_'] = $params['target'];
-        }
-
-        if (isset($params['loggedin'])) {
-            $data['_LOGGEDIN_'] = $params['loggedin'];
+        $metadataParameters = [
+            'target' => '_PAGE_',
+            'loggedin' => '_LOGGEDIN_',
+            'basePath' => '_BASE_PATH_',
+            'bookmarkService' => '_BOOKMARK_SERVICE_',
+        ];
+
+        foreach ($metadataParameters as $parameter => $metaKey) {
+            if (array_key_exists($parameter, $params)) {
+                $data[$metaKey] = $params[$parameter];
+            }
         }
 
         foreach ($this->loadedPlugins as $plugin) {
             $hookFunction = $this->buildHookName($hook, $plugin);
 
             if (function_exists($hookFunction)) {
-                $data = call_user_func($hookFunction, $data, $this->conf);
+                try {
+                    $data = call_user_func($hookFunction, $data, $this->conf);
+                } catch (\Throwable $e) {
+                    $error = $plugin . t(' [plugin incompatibility]: ') . $e->getMessage();
+                    $this->errors = array_unique(array_merge($this->errors, [$error]));
+                }
             }
         }
+
+        foreach ($metadataParameters as $metaKey) {
+            unset($data[$metaKey]);
+        }
     }
 
     /**
diff --git a/application/render/PageBuilder.php b/application/render/PageBuilder.php
index 3f86fc26..41b357dd 100644
--- a/application/render/PageBuilder.php
+++ b/application/render/PageBuilder.php
@@ -3,10 +3,12 @@
 namespace Shaarli\Render;
 
 use Exception;
+use exceptions\MissingBasePathException;
 use RainTPL;
 use Shaarli\ApplicationUtils;
-use Shaarli\Bookmark\LinkDB;
+use Shaarli\Bookmark\BookmarkServiceInterface;
 use Shaarli\Config\ConfigManager;
+use Shaarli\Security\SessionManager;
 use Shaarli\Thumbnailer;
 
 /**
@@ -34,9 +36,9 @@ class PageBuilder
     protected $session;
 
     /**
-     * @var LinkDB $linkDB instance.
+     * @var BookmarkServiceInterface $bookmarkService instance.
      */
-    protected $linkDB;
+    protected $bookmarkService;
 
     /**
      * @var null|string XSRF token
@@ -52,23 +54,32 @@ class PageBuilder
      * PageBuilder constructor.
      * $tpl is initialized at false for lazy loading.
      *
-     * @param ConfigManager $conf       Configuration Manager instance (reference).
-     * @param array         $session    $_SESSION array
-     * @param LinkDB        $linkDB     instance.
-     * @param string        $token      Session token
-     * @param bool          $isLoggedIn
+     * @param ConfigManager            $conf    Configuration Manager instance (reference).
+     * @param array                    $session $_SESSION array
+     * @param BookmarkServiceInterface $linkDB  instance.
+     * @param string                   $token   Session token
+     * @param bool                     $isLoggedIn
      */
     public function __construct(&$conf, $session, $linkDB = null, $token = null, $isLoggedIn = false)
     {
         $this->tpl = false;
         $this->conf = $conf;
         $this->session = $session;
-        $this->linkDB = $linkDB;
+        $this->bookmarkService = $linkDB;
         $this->token = $token;
         $this->isLoggedIn = $isLoggedIn;
     }
 
     /**
+     * Reset current state of template rendering.
+     * Mostly useful for error handling. We remove everything, and display the error template.
+     */
+    public function reset(): void
+    {
+        $this->tpl = false;
+    }
+
+    /**
      * Initialize all default tpl tags.
      */
     private function initialize()
@@ -125,8 +136,8 @@ class PageBuilder
 
         $this->tpl->assign('language', $this->conf->get('translation.language'));
 
-        if ($this->linkDB !== null) {
-            $this->tpl->assign('tags', $this->linkDB->linksCountPerTag());
+        if ($this->bookmarkService !== null) {
+            $this->tpl->assign('tags', escape($this->bookmarkService->bookmarksCountPerTag()));
         }
 
         $this->tpl->assign(
@@ -136,16 +147,43 @@ class PageBuilder
         $this->tpl->assign('thumbnails_width', $this->conf->get('thumbnails.width'));
         $this->tpl->assign('thumbnails_height', $this->conf->get('thumbnails.height'));
 
-        if (!empty($_SESSION['warnings'])) {
-            $this->tpl->assign('global_warnings', $_SESSION['warnings']);
-            unset($_SESSION['warnings']);
-        }
+        $this->tpl->assign('formatter', $this->conf->get('formatter', 'default'));
+
+        $this->tpl->assign('links_per_page', $this->session['LINKS_PER_PAGE']);
 
         // To be removed with a proper theme configuration.
         $this->tpl->assign('conf', $this->conf);
     }
 
     /**
+     * Affect variable after controller processing.
+     * Used for alert messages.
+     */
+    protected function finalize(string $basePath): void
+    {
+        // TODO: use the SessionManager
+        $messageKeys = [
+            SessionManager::KEY_SUCCESS_MESSAGES,
+            SessionManager::KEY_WARNING_MESSAGES,
+            SessionManager::KEY_ERROR_MESSAGES
+        ];
+        foreach ($messageKeys as $messageKey) {
+            if (!empty($_SESSION[$messageKey])) {
+                $this->tpl->assign('global_' . $messageKey, $_SESSION[$messageKey]);
+                unset($_SESSION[$messageKey]);
+            }
+        }
+
+        $this->assign('base_path', $basePath);
+        $this->assign(
+            'asset_path',
+            $basePath . '/' .
+            rtrim($this->conf->get('resource.raintpl_tpl', 'tpl'), '/') . '/' .
+            $this->conf->get('resource.theme', 'default')
+        );
+    }
+
+    /**
      * The following assign() method is basically the same as RainTPL (except lazy loading)
      *
      * @param string $placeholder Template placeholder.
@@ -183,33 +221,21 @@ class PageBuilder
     }
 
     /**
-     * Render a specific page (using a template file).
-     * e.g. $pb->renderPage('picwall');
+     * Render a specific page as string (using a template file).
+     * e.g. $pb->render('picwall');
      *
      * @param string $page Template filename (without extension).
+     *
+     * @return string Processed template content
      */
-    public function renderPage($page)
+    public function render(string $page, string $basePath): string
     {
         if ($this->tpl === false) {
             $this->initialize();
         }
 
-        $this->tpl->draw($page);
-    }
+        $this->finalize($basePath);
 
-    /**
-     * Render a 404 page (uses the template : tpl/404.tpl)
-     * usage: $PAGE->render404('The link was deleted')
-     *
-     * @param string $message A message to display what is not found
-     */
-    public function render404($message = '')
-    {
-        if (empty($message)) {
-            $message = t('The page you are trying to reach does not exist or has been deleted.');
-        }
-        header($_SERVER['SERVER_PROTOCOL'] . ' ' . t('404 Not Found'));
-        $this->tpl->assign('error_message', $message);
-        $this->renderPage('404');
+        return $this->tpl->draw($page, true);
     }
 }
diff --git a/application/render/PageCacheManager.php b/application/render/PageCacheManager.php
new file mode 100644
index 00000000..97805c35
--- /dev/null
+++ b/application/render/PageCacheManager.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Shaarli\Render;
+
+use Shaarli\Feed\CachedPage;
+
+/**
+ * Cache utilities
+ */
+class PageCacheManager
+{
+    /** @var string Cache directory */
+    protected $pageCacheDir;
+
+    /** @var bool */
+    protected $isLoggedIn;
+
+    public function __construct(string $pageCacheDir, bool $isLoggedIn)
+    {
+        $this->pageCacheDir = $pageCacheDir;
+        $this->isLoggedIn = $isLoggedIn;
+    }
+
+    /**
+     * Purges all cached pages
+     *
+     * @return string|null an error string if the directory is missing
+     */
+    public function purgeCachedPages(): ?string
+    {
+        if (!is_dir($this->pageCacheDir)) {
+            $error = sprintf(t('Cannot purge %s: no directory'), $this->pageCacheDir);
+            error_log($error);
+
+            return $error;
+        }
+
+        array_map('unlink', glob($this->pageCacheDir . '/*.cache'));
+
+        return null;
+    }
+
+    /**
+     * Invalidates caches when the database is changed or the user logs out.
+     */
+    public function invalidateCaches(): void
+    {
+        // Purge page cache shared by sessions.
+        $this->purgeCachedPages();
+    }
+
+    public function getCachePage(string $pageUrl): CachedPage
+    {
+        return new CachedPage(
+            $this->pageCacheDir,
+            $pageUrl,
+            false === $this->isLoggedIn
+        );
+    }
+}
diff --git a/application/render/TemplatePage.php b/application/render/TemplatePage.php
new file mode 100644
index 00000000..8af8228a
--- /dev/null
+++ b/application/render/TemplatePage.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Render;
+
+interface TemplatePage
+{
+    public const ERROR_404 = '404';
+    public const ADDLINK = 'addlink';
+    public const CHANGE_PASSWORD = 'changepassword';
+    public const CHANGE_TAG = 'changetag';
+    public const CONFIGURE = 'configure';
+    public const DAILY = 'daily';
+    public const DAILY_RSS = 'dailyrss';
+    public const EDIT_LINK = 'editlink';
+    public const ERROR = 'error';
+    public const EXPORT = 'export';
+    public const NETSCAPE_EXPORT_BOOKMARKS = 'export.bookmarks';
+    public const FEED_ATOM = 'feed.atom';
+    public const FEED_RSS = 'feed.rss';
+    public const IMPORT = 'import';
+    public const INSTALL = 'install';
+    public const LINKLIST = 'linklist';
+    public const LOGIN = 'loginform';
+    public const OPEN_SEARCH = 'opensearch';
+    public const PICTURE_WALL = 'picwall';
+    public const PLUGINS_ADMIN = 'pluginsadmin';
+    public const TAG_CLOUD = 'tag.cloud';
+    public const TAG_LIST = 'tag.list';
+    public const THUMBNAILS = 'thumbnails';
+    public const TOOLS = 'tools';
+}
diff --git a/application/security/CookieManager.php b/application/security/CookieManager.php
new file mode 100644
index 00000000..cde4746e
--- /dev/null
+++ b/application/security/CookieManager.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Security;
+
+class CookieManager
+{
+    /** @var string Name of the cookie set after logging in **/
+    public const STAY_SIGNED_IN = 'shaarli_staySignedIn';
+
+    /** @var mixed $_COOKIE set by reference */
+    protected $cookies;
+
+    public function __construct(array &$cookies)
+    {
+        $this->cookies = $cookies;
+    }
+
+    public function setCookieParameter(string $key, string $value, int $expires, string $path): self
+    {
+        $this->cookies[$key] = $value;
+
+        setcookie($key, $value, $expires, $path);
+
+        return $this;
+    }
+
+    public function getCookieParameter(string $key, string $default = null): ?string
+    {
+        return $this->cookies[$key] ?? $default;
+    }
+}
diff --git a/application/security/LoginManager.php b/application/security/LoginManager.php
index 0b0ce0b1..d74c3118 100644
--- a/application/security/LoginManager.php
+++ b/application/security/LoginManager.php
@@ -1,6 +1,7 @@
 <?php
 namespace Shaarli\Security;
 
+use Exception;
 use Shaarli\Config\ConfigManager;
 
 /**
@@ -8,9 +9,6 @@ use Shaarli\Config\ConfigManager;
  */
 class LoginManager
 {
-    /** @var string Name of the cookie set after logging in **/
-    public static $STAY_SIGNED_IN_COOKIE = 'shaarli_staySignedIn';
-
     /** @var array A reference to the $_GLOBALS array */
     protected $globals = [];
 
@@ -31,17 +29,21 @@ class LoginManager
 
     /** @var string User sign-in token depending on remote IP and credentials */
     protected $staySignedInToken = '';
+    /** @var CookieManager */
+    protected $cookieManager;
 
     /**
      * Constructor
      *
      * @param ConfigManager  $configManager  Configuration Manager instance
      * @param SessionManager $sessionManager SessionManager instance
+     * @param CookieManager  $cookieManager  CookieManager instance
      */
-    public function __construct($configManager, $sessionManager)
+    public function __construct($configManager, $sessionManager, $cookieManager)
     {
         $this->configManager = $configManager;
         $this->sessionManager = $sessionManager;
+        $this->cookieManager = $cookieManager;
         $this->banManager = new BanManager(
             $this->configManager->get('security.trusted_proxies', []),
             $this->configManager->get('security.ban_after'),
@@ -85,10 +87,9 @@ class LoginManager
     /**
      * Check user session state and validity (expiration)
      *
-     * @param array  $cookie     The $_COOKIE array
      * @param string $clientIpId Client IP address identifier
      */
-    public function checkLoginState($cookie, $clientIpId)
+    public function checkLoginState($clientIpId)
     {
         if (! $this->configManager->exists('credentials.login')) {
             // Shaarli is not configured yet
@@ -96,9 +97,7 @@ class LoginManager
             return;
         }
 
-        if (isset($cookie[self::$STAY_SIGNED_IN_COOKIE])
-            && $cookie[self::$STAY_SIGNED_IN_COOKIE] === $this->staySignedInToken
-        ) {
+        if ($this->staySignedInToken === $this->cookieManager->getCookieParameter(CookieManager::STAY_SIGNED_IN)) {
             // The user client has a valid stay-signed-in cookie
             // Session information is updated with the current client information
             $this->sessionManager->storeLoginInfo($clientIpId);
@@ -139,26 +138,86 @@ class LoginManager
      */
     public function checkCredentials($remoteIp, $clientIpId, $login, $password)
     {
-        $hash = sha1($password . $login . $this->configManager->get('credentials.salt'));
+        // Check login matches config
+        if ($login !== $this->configManager->get('credentials.login')) {
+            return false;
+        }
 
-        if ($login != $this->configManager->get('credentials.login')
-            || $hash != $this->configManager->get('credentials.hash')
-        ) {
+        // Check credentials
+        try {
+            $useLdapLogin = !empty($this->configManager->get('ldap.host'));
+            if ((false === $useLdapLogin && $this->checkCredentialsFromLocalConfig($login, $password))
+                || (true === $useLdapLogin && $this->checkCredentialsFromLdap($login, $password))
+            ) {
+                    $this->sessionManager->storeLoginInfo($clientIpId);
+                    logm(
+                        $this->configManager->get('resource.log'),
+                        $remoteIp,
+                        'Login successful'
+                    );
+                    return true;
+            }
+        }
+        catch(Exception $exception) {
             logm(
                 $this->configManager->get('resource.log'),
                 $remoteIp,
-                'Login failed for user ' . $login
+                'Exception while checking credentials: ' . $exception
             );
-            return false;
         }
 
-        $this->sessionManager->storeLoginInfo($clientIpId);
         logm(
             $this->configManager->get('resource.log'),
             $remoteIp,
-            'Login successful'
+            'Login failed for user ' . $login
+        );
+        return false;
+    }
+
+
+    /**
+     * Check user credentials from local config
+     *
+     * @param string $login      Username
+     * @param string $password   Password
+     *
+     * @return bool true if the provided credentials are valid, false otherwise
+     */
+    public function checkCredentialsFromLocalConfig($login, $password) {
+        $hash = sha1($password . $login . $this->configManager->get('credentials.salt'));
+
+        return $login == $this->configManager->get('credentials.login')
+             && $hash == $this->configManager->get('credentials.hash');
+    }
+
+    /**
+     * Check user credentials are valid through LDAP bind
+     *
+     * @param string $remoteIp   Remote client IP address
+     * @param string $clientIpId Client IP address identifier
+     * @param string $login      Username
+     * @param string $password   Password
+     *
+     * @return bool true if the provided credentials are valid, false otherwise
+     */
+    public function checkCredentialsFromLdap($login, $password, $connect = null, $bind = null)
+    {
+        $connect = $connect ?? function($host) {
+            $resource = ldap_connect($host);
+
+            ldap_set_option($resource, LDAP_OPT_PROTOCOL_VERSION, 3);
+
+            return $resource;
+        };
+        $bind = $bind ?? function($handle, $dn, $password) {
+            return ldap_bind($handle, $dn, $password);
+        };
+
+        return $bind(
+            $connect($this->configManager->get('ldap.host')),
+            sprintf($this->configManager->get('ldap.dn'), $login),
+            $password
         );
-        return true;
     }
 
     /**
diff --git a/application/security/SessionManager.php b/application/security/SessionManager.php
index b8b8ab8d..36df8c1c 100644
--- a/application/security/SessionManager.php
+++ b/application/security/SessionManager.php
@@ -8,6 +8,14 @@ use Shaarli\Config\ConfigManager;
  */
 class SessionManager
 {
+    public const KEY_LINKS_PER_PAGE = 'LINKS_PER_PAGE';
+    public const KEY_VISIBILITY = 'visibility';
+    public const KEY_UNTAGGED_ONLY = 'untaggedonly';
+
+    public const KEY_SUCCESS_MESSAGES = 'successes';
+    public const KEY_WARNING_MESSAGES = 'warnings';
+    public const KEY_ERROR_MESSAGES = 'errors';
+
     /** @var int Session expiration timeout, in seconds */
     public static $SHORT_TIMEOUT = 3600;    // 1 hour
 
@@ -23,16 +31,35 @@ class SessionManager
     /** @var bool Whether the user should stay signed in (LONG_TIMEOUT) */
     protected $staySignedIn = false;
 
+    /** @var string */
+    protected $savePath;
+
     /**
      * Constructor
      *
-     * @param array         $session The $_SESSION array (reference)
-     * @param ConfigManager $conf    ConfigManager instance
+     * @param array         $session  The $_SESSION array (reference)
+     * @param ConfigManager $conf     ConfigManager instance
+     * @param string        $savePath Session save path returned by builtin function session_save_path()
      */
-    public function __construct(& $session, $conf)
+    public function __construct(&$session, $conf, string $savePath)
     {
         $this->session = &$session;
         $this->conf = $conf;
+        $this->savePath = $savePath;
+    }
+
+    /**
+     * Initialize XSRF token and links per page session variables.
+     */
+    public function initialize(): void
+    {
+        if (!isset($this->session['tokens'])) {
+            $this->session['tokens'] = [];
+        }
+
+        if (!isset($this->session['LINKS_PER_PAGE'])) {
+            $this->session['LINKS_PER_PAGE'] = $this->conf->get('general.links_per_page', 20);
+        }
     }
 
     /**
@@ -156,7 +183,6 @@ class SessionManager
             unset($this->session['expires_on']);
             unset($this->session['username']);
             unset($this->session['visibility']);
-            unset($this->session['untaggedonly']);
         }
     }
 
@@ -196,4 +222,84 @@ class SessionManager
         }
         return true;
     }
+
+    /** @return array Local reference to the global $_SESSION array */
+    public function getSession(): array
+    {
+        return $this->session;
+    }
+
+    /**
+     * @param mixed $default value which will be returned if the $key is undefined
+     *
+     * @return mixed Content stored in session
+     */
+    public function getSessionParameter(string $key, $default = null)
+    {
+        return $this->session[$key] ?? $default;
+    }
+
+    /**
+     * Store a variable in user session.
+     *
+     * @param string $key   Session key
+     * @param mixed  $value Session value to store
+     *
+     * @return $this
+     */
+    public function setSessionParameter(string $key, $value): self
+    {
+        $this->session[$key] = $value;
+
+        return $this;
+    }
+
+    /**
+     * Store a variable in user session.
+     *
+     * @param string $key   Session key
+     *
+     * @return $this
+     */
+    public function deleteSessionParameter(string $key): self
+    {
+        unset($this->session[$key]);
+
+        return $this;
+    }
+
+    public function getSavePath(): string
+    {
+        return $this->savePath;
+    }
+
+    /*
+     * Next public functions wrapping native PHP session API.
+     */
+
+    public function destroy(): bool
+    {
+        $this->session = [];
+
+        return session_destroy();
+    }
+
+    public function start(): bool
+    {
+        if (session_status() === PHP_SESSION_ACTIVE) {
+            $this->destroy();
+        }
+
+        return session_start();
+    }
+
+    public function cookieParameters(int $lifeTime, string $path, string $domain): bool
+    {
+        return session_set_cookie_params($lifeTime, $path, $domain);
+    }
+
+    public function regenerateId(bool $deleteOldSession = false): bool
+    {
+        return session_regenerate_id($deleteOldSession);
+    }
 }
diff --git a/application/updater/Updater.php b/application/updater/Updater.php
index beb9ea9b..88a7bc7b 100644
--- a/application/updater/Updater.php
+++ b/application/updater/Updater.php
@@ -2,25 +2,14 @@
 
 namespace Shaarli\Updater;
 
-use Exception;
-use RainTPL;
-use ReflectionClass;
-use ReflectionException;
-use ReflectionMethod;
-use Shaarli\ApplicationUtils;
-use Shaarli\Bookmark\LinkDB;
-use Shaarli\Bookmark\LinkFilter;
-use Shaarli\Config\ConfigJson;
+use Shaarli\Bookmark\BookmarkServiceInterface;
 use Shaarli\Config\ConfigManager;
-use Shaarli\Config\ConfigPhp;
-use Shaarli\Exceptions\IOException;
-use Shaarli\Thumbnailer;
 use Shaarli\Updater\Exception\UpdaterException;
 
 /**
- * Class updater.
+ * Class Updater.
  * Used to update stuff when a new Shaarli's version is reached.
- * Update methods are ran only once, and the stored in a JSON file.
+ * Update methods are ran only once, and the stored in a TXT file.
  */
 class Updater
 {
@@ -30,9 +19,9 @@ class Updater
     protected $doneUpdates;
 
     /**
-     * @var LinkDB instance.
+     * @var BookmarkServiceInterface instance.
      */
-    protected $linkDB;
+    protected $bookmarkService;
 
     /**
      * @var ConfigManager $conf Configuration Manager instance.
@@ -45,36 +34,32 @@ class Updater
     protected $isLoggedIn;
 
     /**
-     * @var array $_SESSION
+     * @var \ReflectionMethod[] List of current class methods.
      */
-    protected $session;
+    protected $methods;
 
     /**
-     * @var ReflectionMethod[] List of current class methods.
+     * @var string $basePath Shaarli root directory (from HTTP Request)
      */
-    protected $methods;
+    protected $basePath = null;
 
     /**
      * Object constructor.
      *
-     * @param array         $doneUpdates Updates which are already done.
-     * @param LinkDB        $linkDB      LinkDB instance.
-     * @param ConfigManager $conf        Configuration Manager instance.
-     * @param boolean       $isLoggedIn  True if the user is logged in.
-     * @param array         $session     $_SESSION (by reference)
-     *
-     * @throws ReflectionException
+     * @param array                    $doneUpdates Updates which are already done.
+     * @param BookmarkServiceInterface $linkDB      LinksService instance.
+     * @param ConfigManager            $conf        Configuration Manager instance.
+     * @param boolean                  $isLoggedIn  True if the user is logged in.
      */
-    public function __construct($doneUpdates, $linkDB, $conf, $isLoggedIn, &$session = [])
+    public function __construct($doneUpdates, $linkDB, $conf, $isLoggedIn)
     {
         $this->doneUpdates = $doneUpdates;
-        $this->linkDB = $linkDB;
+        $this->bookmarkService = $linkDB;
         $this->conf = $conf;
         $this->isLoggedIn = $isLoggedIn;
-        $this->session = &$session;
 
         // Retrieve all update methods.
-        $class = new ReflectionClass($this);
+        $class = new \ReflectionClass($this);
         $this->methods = $class->getMethods();
     }
 
@@ -82,13 +67,15 @@ class Updater
      * Run all new updates.
      * Update methods have to start with 'updateMethod' and return true (on success).
      *
+     * @param string $basePath Shaarli root directory (from HTTP Request)
+     *
      * @return array An array containing ran updates.
      *
      * @throws UpdaterException If something went wrong.
      */
-    public function update()
+    public function update(string $basePath = null)
     {
-        $updatesRan = array();
+        $updatesRan = [];
 
         // If the user isn't logged in, exit without updating.
         if ($this->isLoggedIn !== true) {
@@ -96,12 +83,12 @@ class Updater
         }
 
         if ($this->methods === null) {
-            throw new UpdaterException(t('Couldn\'t retrieve updater class methods.'));
+            throw new UpdaterException('Couldn\'t retrieve LegacyUpdater class methods.');
         }
 
         foreach ($this->methods as $method) {
             // Not an update method or already done, pass.
-            if (!startsWith($method->getName(), 'updateMethod')
+            if (! startsWith($method->getName(), 'updateMethod')
                 || in_array($method->getName(), $this->doneUpdates)
             ) {
                 continue;
@@ -114,7 +101,7 @@ class Updater
                 if ($res === true) {
                     $updatesRan[] = $method->getName();
                 }
-            } catch (Exception $e) {
+            } catch (\Exception $e) {
                 throw new UpdaterException($method, $e);
             }
         }
@@ -132,431 +119,61 @@ class Updater
         return $this->doneUpdates;
     }
 
-    /**
-     * Move deprecated options.php to config.php.
-     *
-     * Milestone 0.9 (old versioning) - shaarli/Shaarli#41:
-     *    options.php is not supported anymore.
-     */
-    public function updateMethodMergeDeprecatedConfigFile()
-    {
-        if (is_file($this->conf->get('resource.data_dir') . '/options.php')) {
-            include $this->conf->get('resource.data_dir') . '/options.php';
-
-            // Load GLOBALS into config
-            $allowedKeys = array_merge(ConfigPhp::$ROOT_KEYS);
-            $allowedKeys[] = 'config';
-            foreach ($GLOBALS as $key => $value) {
-                if (in_array($key, $allowedKeys)) {
-                    $this->conf->set($key, $value);
-                }
-            }
-            $this->conf->write($this->isLoggedIn);
-            unlink($this->conf->get('resource.data_dir') . '/options.php');
-        }
-
-        return true;
-    }
-
-    /**
-     * Move old configuration in PHP to the new config system in JSON format.
-     *
-     * Will rename 'config.php' into 'config.save.php' and create 'config.json.php'.
-     * It will also convert legacy setting keys to the new ones.
-     */
-    public function updateMethodConfigToJson()
-    {
-        // JSON config already exists, nothing to do.
-        if ($this->conf->getConfigIO() instanceof ConfigJson) {
-            return true;
-        }
-
-        $configPhp = new ConfigPhp();
-        $configJson = new ConfigJson();
-        $oldConfig = $configPhp->read($this->conf->getConfigFile() . '.php');
-        rename($this->conf->getConfigFileExt(), $this->conf->getConfigFile() . '.save.php');
-        $this->conf->setConfigIO($configJson);
-        $this->conf->reload();
-
-        $legacyMap = array_flip(ConfigPhp::$LEGACY_KEYS_MAPPING);
-        foreach (ConfigPhp::$ROOT_KEYS as $key) {
-            $this->conf->set($legacyMap[$key], $oldConfig[$key]);
-        }
-
-        // Set sub config keys (config and plugins)
-        $subConfig = array('config', 'plugins');
-        foreach ($subConfig as $sub) {
-            foreach ($oldConfig[$sub] as $key => $value) {
-                if (isset($legacyMap[$sub . '.' . $key])) {
-                    $configKey = $legacyMap[$sub . '.' . $key];
-                } else {
-                    $configKey = $sub . '.' . $key;
-                }
-                $this->conf->set($configKey, $value);
-            }
-        }
-
-        try {
-            $this->conf->write($this->isLoggedIn);
-            return true;
-        } catch (IOException $e) {
-            error_log($e->getMessage());
-            return false;
-        }
-    }
-
-    /**
-     * Escape settings which have been manually escaped in every request in previous versions:
-     *   - general.title
-     *   - general.header_link
-     *   - redirector.url
-     *
-     * @return bool true if the update is successful, false otherwise.
-     */
-    public function updateMethodEscapeUnescapedConfig()
-    {
-        try {
-            $this->conf->set('general.title', escape($this->conf->get('general.title')));
-            $this->conf->set('general.header_link', escape($this->conf->get('general.header_link')));
-            $this->conf->write($this->isLoggedIn);
-        } catch (Exception $e) {
-            error_log($e->getMessage());
-            return false;
-        }
-        return true;
-    }
-
-    /**
-     * Update the database to use the new ID system, which replaces linkdate primary keys.
-     * Also, creation and update dates are now DateTime objects (done by LinkDB).
-     *
-     * Since this update is very sensitve (changing the whole database), the datastore will be
-     * automatically backed up into the file datastore.<datetime>.php.
-     *
-     * LinkDB also adds the field 'shorturl' with the precedent format (linkdate smallhash),
-     * which will be saved by this method.
-     *
-     * @return bool true if the update is successful, false otherwise.
-     */
-    public function updateMethodDatastoreIds()
-    {
-        // up to date database
-        if (isset($this->linkDB[0])) {
-            return true;
-        }
-
-        $save = $this->conf->get('resource.data_dir') . '/datastore.' . date('YmdHis') . '.php';
-        copy($this->conf->get('resource.datastore'), $save);
-
-        $links = array();
-        foreach ($this->linkDB as $offset => $value) {
-            $links[] = $value;
-            unset($this->linkDB[$offset]);
-        }
-        $links = array_reverse($links);
-        $cpt = 0;
-        foreach ($links as $l) {
-            unset($l['linkdate']);
-            $l['id'] = $cpt;
-            $this->linkDB[$cpt++] = $l;
-        }
-
-        $this->linkDB->save($this->conf->get('resource.page_cache'));
-        $this->linkDB->reorder();
-
-        return true;
-    }
-
-    /**
-     * Rename tags starting with a '-' to work with tag exclusion search.
-     */
-    public function updateMethodRenameDashTags()
+    public function readUpdates(string $updatesFilepath): array
     {
-        $linklist = $this->linkDB->filterSearch();
-        foreach ($linklist as $key => $link) {
-            $link['tags'] = preg_replace('/(^| )\-/', '$1', $link['tags']);
-            $link['tags'] = implode(' ', array_unique(LinkFilter::tagsStrToArray($link['tags'], true)));
-            $this->linkDB[$key] = $link;
-        }
-        $this->linkDB->save($this->conf->get('resource.page_cache'));
-        return true;
+        return UpdaterUtils::read_updates_file($updatesFilepath);
     }
 
-    /**
-     * Initialize API settings:
-     *   - api.enabled: true
-     *   - api.secret: generated secret
-     */
-    public function updateMethodApiSettings()
+    public function writeUpdates(string $updatesFilepath, array $updates): void
     {
-        if ($this->conf->exists('api.secret')) {
-            return true;
-        }
-
-        $this->conf->set('api.enabled', true);
-        $this->conf->set(
-            'api.secret',
-            generate_api_secret(
-                $this->conf->get('credentials.login'),
-                $this->conf->get('credentials.salt')
-            )
-        );
-        $this->conf->write($this->isLoggedIn);
-        return true;
+        UpdaterUtils::write_updates_file($updatesFilepath, $updates);
     }
 
     /**
-     * New setting: theme name. If the default theme is used, nothing to do.
-     *
-     * If the user uses a custom theme, raintpl_tpl dir is updated to the parent directory,
-     * and the current theme is set as default in the theme setting.
-     *
-     * @return bool true if the update is successful, false otherwise.
+     * With the Slim routing system, default header link should be `/subfolder/` instead of `?`.
+     * Otherwise you can not go back to the home page.
+     * Example: `/subfolder/picture-wall` -> `/subfolder/picture-wall?` instead of `/subfolder/`.
      */
-    public function updateMethodDefaultTheme()
+    public function updateMethodRelativeHomeLink(): bool
     {
-        // raintpl_tpl isn't the root template directory anymore.
-        // We run the update only if this folder still contains the template files.
-        $tplDir = $this->conf->get('resource.raintpl_tpl');
-        $tplFile = $tplDir . '/linklist.html';
-        if (!file_exists($tplFile)) {
-            return true;
+        if ('?' === trim($this->conf->get('general.header_link'))) {
+            $this->conf->set('general.header_link', $this->basePath . '/', true, true);
         }
 
-        $parent = dirname($tplDir);
-        $this->conf->set('resource.raintpl_tpl', $parent);
-        $this->conf->set('resource.theme', trim(str_replace($parent, '', $tplDir), '/'));
-        $this->conf->write($this->isLoggedIn);
-
-        // Dependency injection gore
-        RainTPL::$tpl_dir = $tplDir;
-
         return true;
     }
 
     /**
-     * Move the file to inc/user.css to data/user.css.
-     *
-     * Note: Due to hardcoded paths, it's not unit testable. But one line of code should be fine.
-     *
-     * @return bool true if the update is successful, false otherwise.
+     * With the Slim routing system, note bookmarks URL formatted `?abcdef`
+     * should be replaced with `/shaare/abcdef`
      */
-    public function updateMethodMoveUserCss()
+    public function updateMethodMigrateExistingNotesUrl(): bool
     {
-        if (!is_file('inc/user.css')) {
-            return true;
-        }
-
-        return rename('inc/user.css', 'data/user.css');
-    }
+        $updated = false;
 
-    /**
-     * * `markdown_escape` is a new setting, set to true as default.
-     *
-     * If the markdown plugin was already enabled, escaping is disabled to avoid
-     * breaking existing entries.
-     */
-    public function updateMethodEscapeMarkdown()
-    {
-        if ($this->conf->exists('security.markdown_escape')) {
-            return true;
-        }
-
-        if (in_array('markdown', $this->conf->get('general.enabled_plugins'))) {
-            $this->conf->set('security.markdown_escape', false);
-        } else {
-            $this->conf->set('security.markdown_escape', true);
-        }
-        $this->conf->write($this->isLoggedIn);
-
-        return true;
-    }
-
-    /**
-     * Add 'http://' to Piwik URL the setting is set.
-     *
-     * @return bool true if the update is successful, false otherwise.
-     */
-    public function updateMethodPiwikUrl()
-    {
-        if (!$this->conf->exists('plugins.PIWIK_URL') || startsWith($this->conf->get('plugins.PIWIK_URL'), 'http')) {
-            return true;
-        }
-
-        $this->conf->set('plugins.PIWIK_URL', 'http://' . $this->conf->get('plugins.PIWIK_URL'));
-        $this->conf->write($this->isLoggedIn);
-
-        return true;
-    }
-
-    /**
-     * Use ATOM feed as default.
-     */
-    public function updateMethodAtomDefault()
-    {
-        if (!$this->conf->exists('feed.show_atom') || $this->conf->get('feed.show_atom') === true) {
-            return true;
-        }
-
-        $this->conf->set('feed.show_atom', true);
-        $this->conf->write($this->isLoggedIn);
-
-        return true;
-    }
-
-    /**
-     * Update updates.check_updates_branch setting.
-     *
-     * If the current major version digit matches the latest branch
-     * major version digit, we set the branch to `latest`,
-     * otherwise we'll check updates on the `stable` branch.
-     *
-     * No update required for the dev version.
-     *
-     * Note: due to hardcoded URL and lack of dependency injection, this is not unit testable.
-     *
-     * FIXME! This needs to be removed when we switch to first digit major version
-     *        instead of the second one since the versionning process will change.
-     */
-    public function updateMethodCheckUpdateRemoteBranch()
-    {
-        if (SHAARLI_VERSION === 'dev' || $this->conf->get('updates.check_updates_branch') === 'latest') {
-            return true;
-        }
-
-        // Get latest branch major version digit
-        $latestVersion = ApplicationUtils::getLatestGitVersionCode(
-            'https://raw.githubusercontent.com/shaarli/Shaarli/latest/shaarli_version.php',
-            5
-        );
-        if (preg_match('/(\d+)\.\d+$/', $latestVersion, $matches) === false) {
-            return false;
-        }
-        $latestMajor = $matches[1];
-
-        // Get current major version digit
-        preg_match('/(\d+)\.\d+$/', SHAARLI_VERSION, $matches);
-        $currentMajor = $matches[1];
-
-        if ($currentMajor === $latestMajor) {
-            $branch = 'latest';
-        } else {
-            $branch = 'stable';
-        }
-        $this->conf->set('updates.check_updates_branch', $branch);
-        $this->conf->write($this->isLoggedIn);
-        return true;
-    }
-
-    /**
-     * Reset history store file due to date format change.
-     */
-    public function updateMethodResetHistoryFile()
-    {
-        if (is_file($this->conf->get('resource.history'))) {
-            unlink($this->conf->get('resource.history'));
-        }
-        return true;
-    }
-
-    /**
-     * Save the datastore -> the link order is now applied when links are saved.
-     */
-    public function updateMethodReorderDatastore()
-    {
-        $this->linkDB->save($this->conf->get('resource.page_cache'));
-        return true;
-    }
-
-    /**
-     * Change privateonly session key to visibility.
-     */
-    public function updateMethodVisibilitySession()
-    {
-        if (isset($_SESSION['privateonly'])) {
-            unset($_SESSION['privateonly']);
-            $_SESSION['visibility'] = 'private';
-        }
-        return true;
-    }
-
-    /**
-     * Add download size and timeout to the configuration file
-     *
-     * @return bool true if the update is successful, false otherwise.
-     */
-    public function updateMethodDownloadSizeAndTimeoutConf()
-    {
-        if ($this->conf->exists('general.download_max_size')
-            && $this->conf->exists('general.download_timeout')
-        ) {
-            return true;
-        }
-
-        if (!$this->conf->exists('general.download_max_size')) {
-            $this->conf->set('general.download_max_size', 1024 * 1024 * 4);
-        }
-
-        if (!$this->conf->exists('general.download_timeout')) {
-            $this->conf->set('general.download_timeout', 30);
-        }
-
-        $this->conf->write($this->isLoggedIn);
-        return true;
-    }
+        foreach ($this->bookmarkService->search() as $bookmark) {
+            if ($bookmark->isNote()
+                && startsWith($bookmark->getUrl(), '?')
+                && 1 === preg_match('/^\?([a-zA-Z0-9-_@]{6})($|&|#)/', $bookmark->getUrl(), $match)
+            ) {
+                $updated = true;
+                $bookmark = $bookmark->setUrl('/shaare/' . $match[1]);
 
-    /**
-     * * Move thumbnails management to WebThumbnailer, coming with new settings.
-     */
-    public function updateMethodWebThumbnailer()
-    {
-        if ($this->conf->exists('thumbnails.mode')) {
-            return true;
+                $this->bookmarkService->set($bookmark, false);
+            }
         }
 
-        $thumbnailsEnabled = extension_loaded('gd') && $this->conf->get('thumbnail.enable_thumbnails', true);
-        $this->conf->set('thumbnails.mode', $thumbnailsEnabled ? Thumbnailer::MODE_ALL : Thumbnailer::MODE_NONE);
-        $this->conf->set('thumbnails.width', 125);
-        $this->conf->set('thumbnails.height', 90);
-        $this->conf->remove('thumbnail');
-        $this->conf->write(true);
-
-        if ($thumbnailsEnabled) {
-            $this->session['warnings'][] = t(
-                'You have enabled or changed thumbnails mode. <a href="?do=thumbs_update">Please synchronize them</a>.'
-            );
+        if ($updated) {
+            $this->bookmarkService->save();
         }
 
         return true;
     }
 
-    /**
-     * Set sticky = false on all links
-     *
-     * @return bool true if the update is successful, false otherwise.
-     */
-    public function updateMethodSetSticky()
+    public function setBasePath(string $basePath): self
     {
-        foreach ($this->linkDB as $key => $link) {
-            if (isset($link['sticky'])) {
-                return true;
-            }
-            $link['sticky'] = false;
-            $this->linkDB[$key] = $link;
-        }
-
-        $this->linkDB->save($this->conf->get('resource.page_cache'));
-
-        return true;
-    }
+        $this->basePath = $basePath;
 
-    /**
-     * Remove redirector settings.
-     */
-    public function updateMethodRemoveRedirector()
-    {
-        $this->conf->remove('redirector');
-        $this->conf->write(true);
-        return true;
+        return $this;
     }
 }
diff --git a/application/updater/UpdaterUtils.php b/application/updater/UpdaterUtils.php
index 34d4f422..828a49fc 100644
--- a/application/updater/UpdaterUtils.php
+++ b/application/updater/UpdaterUtils.php
@@ -1,39 +1,44 @@
 <?php
 
-/**
- * Read the updates file, and return already done updates.
- *
- * @param string $updatesFilepath Updates file path.
- *
- * @return array Already done update methods.
- */
-function read_updates_file($updatesFilepath)
+namespace Shaarli\Updater;
+
+class UpdaterUtils
 {
-    if (! empty($updatesFilepath) && is_file($updatesFilepath)) {
-        $content = file_get_contents($updatesFilepath);
-        if (! empty($content)) {
-            return explode(';', $content);
+    /**
+     * Read the updates file, and return already done updates.
+     *
+     * @param string $updatesFilepath Updates file path.
+     *
+     * @return array Already done update methods.
+     */
+    public static function read_updates_file($updatesFilepath)
+    {
+        if (! empty($updatesFilepath) && is_file($updatesFilepath)) {
+            $content = file_get_contents($updatesFilepath);
+            if (! empty($content)) {
+                return explode(';', $content);
+            }
         }
+        return array();
     }
-    return array();
-}
 
-/**
- * Write updates file.
- *
- * @param string $updatesFilepath Updates file path.
- * @param array  $updates         Updates array to write.
- *
- * @throws Exception Couldn't write version number.
- */
-function write_updates_file($updatesFilepath, $updates)
-{
-    if (empty($updatesFilepath)) {
-        throw new Exception(t('Updates file path is not set, can\'t write updates.'));
-    }
+    /**
+     * Write updates file.
+     *
+     * @param string $updatesFilepath Updates file path.
+     * @param array  $updates         Updates array to write.
+     *
+     * @throws \Exception Couldn't write version number.
+     */
+    public static function write_updates_file($updatesFilepath, $updates)
+    {
+        if (empty($updatesFilepath)) {
+            throw new \Exception('Updates file path is not set, can\'t write updates.');
+        }
 
-    $res = file_put_contents($updatesFilepath, implode(';', $updates));
-    if ($res === false) {
-        throw new Exception(t('Unable to write updates in '. $updatesFilepath . '.'));
+        $res = file_put_contents($updatesFilepath, implode(';', $updates));
+        if ($res === false) {
+            throw new \Exception('Unable to write updates in '. $updatesFilepath . '.');
+        }
     }
 }