Apply the new system (Bookmark + Service) to the whole code base

See https://github.com/shaarli/Shaarli/issues/1307

17 files changed, 287 insertions, 734 deletions

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/Utils.php b/application/Utils.php
index 925e1a22..56f5b9a2 100644
--- a/application/Utils.php
+++ b/application/Utils.php
@@ -162,7 +162,7 @@ function generateLocation($referer, $host, $loopTerms = array())
     $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;
         }
diff --git a/application/api/ApiMiddleware.php b/application/api/ApiMiddleware.php
index 2d55bda6..4745ac94 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;
@@ -117,7 +118,7 @@ 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 +127,10 @@ 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 5ac07c4d..5156a5f7 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;
 
 /**
@@ -54,28 +55,28 @@ class ApiUtils
     /**
      * 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'] = $indexUrl . $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'] = '';
         }
@@ -83,7 +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.
@@ -91,50 +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;
     }
@@ -143,7 +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/BookmarkArray.php b/application/bookmark/BookmarkArray.php
index b427c91a..d87d43b4 100644
--- a/application/bookmark/BookmarkArray.php
+++ b/application/bookmark/BookmarkArray.php
@@ -118,7 +118,7 @@ class BookmarkArray implements \Iterator, \Countable, \ArrayAccess
         $realOffset = $this->getBookmarkOffset($offset);
         $url = $this->bookmarks[$realOffset]->getUrl();
         unset($this->urls[$url]);
-        unset($this->ids[$realOffset]);
+        unset($this->ids[$offset]);
         unset($this->bookmarks[$realOffset]);
     }
 
diff --git a/application/config/ConfigManager.php b/application/config/ConfigManager.php
index c95e6800..e45bb4c3 100644
--- a/application/config/ConfigManager.php
+++ b/application/config/ConfigManager.php
@@ -389,6 +389,8 @@ class ConfigManager
         $this->setEmpty('translation.extensions', []);
 
         $this->setEmpty('plugins', array());
+
+        $this->setEmpty('formatter', 'markdown');
     }
 
     /**
diff --git a/application/feed/FeedBuilder.php b/application/feed/FeedBuilder.php
index 957c8273..40bd4f15 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.
@@ -26,16 +29,21 @@ 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 BookmarkFormatter instance.
+     */
+    protected $formatter;
+
+    /**
      * @var string RSS or ATOM feed.
      */
     protected $feedType;
@@ -56,7 +64,7 @@ class FeedBuilder
     protected $isLoggedIn;
 
     /**
-     * @var boolean Use permalinks instead of direct links if true.
+     * @var boolean Use permalinks instead of direct bookmarks if true.
      */
     protected $usePermalinks;
 
@@ -78,16 +86,17 @@ class FeedBuilder
     /**
      * Feed constructor.
      *
-     * @param \Shaarli\Bookmark\LinkDB $linkDB     LinkDB instance.
+     * @param BookmarkServiceInterface $linkDB     LinkDB instance.
+     * @param BookmarkFormatter        $formatter  instance.
      * @param string                   $feedType   Type of feed.
      * @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, $feedType, $serverInfo, $userInput, $isLoggedIn)
     {
         $this->linkDB = $linkDB;
+        $this->formatter = $formatter;
         $this->feedType = $feedType;
         $this->serverInfo = $serverInfo;
         $this->userInput = $userInput;
@@ -101,13 +110,13 @@ class FeedBuilder
      */
     public function buildData()
     {
-        // Search for untagged links
+        // Search for untagged bookmarks
         if (isset($this->userInput['searchtags']) && empty($this->userInput['searchtags'])) {
             $this->userInput['searchtags'] = false;
         }
 
         // Optionally filter the results:
-        $linksToDisplay = $this->linkDB->filterSearch($this->userInput);
+        $linksToDisplay = $this->linkDB->search($this->userInput);
 
         $nblinksToDisplay = $this->getNbLinks(count($linksToDisplay));
 
@@ -118,6 +127,7 @@ 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);
@@ -139,54 +149,44 @@ class FeedBuilder
     /**
      * Build a feed item (one per shaare).
      *
-     * @param array  $link     Single link array extracted from LinkDB.
-     * @param string $pageaddr Index URL.
+     * @param Bookmark $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'];
-        }
+        $data = $this->formatter->format($link);
+        $data['guid'] = $pageaddr . '?' . $data['shorturl'];
         if ($this->usePermalinks === true) {
-            $permalink = '<a href="' . $link['url'] . '" title="' . t('Direct link') . '">' . t('Direct link') . '</a>';
+            $permalink = '<a href="'. $data['url'] .'" title="'. t('Direct link') .'">'. t('Direct link') .'</a>';
         } else {
-            $permalink = '<a href="' . $link['guid'] . '" title="' . t('Permalink') . '">' . t('Permalink') . '</a>';
+            $permalink = '<a href="'. $data['guid'] .'" title="'. t('Permalink') .'">'. t('Permalink') .'</a>';
         }
-        $link['description'] = format_description($link['description'], $pageaddr);
-        $link['description'] .= PHP_EOL . PHP_EOL . '<br>&#8212; ' . $permalink;
+        $data['description'] .= PHP_EOL . PHP_EOL . '<br>&#8212; ' . $permalink;
 
-        $pubDate = $link['created'];
-        $link['pub_iso_date'] = $this->getIsoDate($pubDate);
+        $data['pub_iso_date'] = $this->getIsoDate($data['created']);
 
         // 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);
+        if (!empty($link->getUpdated())) {
+            $data['up_iso_date'] = $this->getIsoDate($data['updated'], DateTime::ATOM);
         } else {
-            $link['up_iso_date'] = $this->getIsoDate($pubDate, DateTime::ATOM);
+            $data['up_iso_date'] = $this->getIsoDate($data['created'], DateTime::ATOM);
         }
 
         // Save the more recent item.
-        if (empty($this->latestDate) || $this->latestDate < $pubDate) {
-            $this->latestDate = $pubDate;
+        if (empty($this->latestDate) || $this->latestDate < $data['created']) {
+            $this->latestDate = $data['created'];
         }
-        if (!empty($upDate) && $this->latestDate < $upDate) {
-            $this->latestDate = $upDate;
+        if (!empty($data['updated']) && $this->latestDate < $data['updated']) {
+            $this->latestDate = $data['updated'];
         }
 
-        $taglist = array_filter(explode(' ', $link['tags']), 'strlen');
-        uasort($taglist, 'strcasecmp');
-        $link['taglist'] = $taglist;
-
-        return $link;
+        return $data;
     }
 
     /**
-     * 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.
      */
@@ -273,11 +273,11 @@ 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 $max maximum number of bookmarks to display.
      *
-     * @return int number of links to display.
+     * @return int number of bookmarks to display.
      */
     public function getNbLinks($max)
     {
diff --git a/application/formatter/BookmarkMarkdownFormatter.php b/application/formatter/BookmarkMarkdownFormatter.php
index f60c61f4..7797bfbf 100644
--- a/application/formatter/BookmarkMarkdownFormatter.php
+++ b/application/formatter/BookmarkMarkdownFormatter.php
@@ -57,6 +57,7 @@ class BookmarkMarkdownFormatter extends BookmarkDefaultFormatter
         $processedDescription = $bookmark->getDescription();
         $processedDescription = $this->filterProtocols($processedDescription);
         $processedDescription = $this->formatHashTags($processedDescription);
+        $processedDescription = $this->reverseEscapedHtml($processedDescription);
         $processedDescription = $this->parsedown
             ->setMarkupEscaped($this->escape)
             ->setBreaksEnabled(true)
@@ -195,4 +196,9 @@ class BookmarkMarkdownFormatter extends BookmarkDefaultFormatter
         );
         return $description;
     }
+
+    protected function reverseEscapedHtml($description)
+    {
+        return unescape($description);
+    }
 }
diff --git a/application/netscape/NetscapeBookmarkUtils.php b/application/netscape/NetscapeBookmarkUtils.php
index 28665941..d64eef7f 100644
--- a/application/netscape/NetscapeBookmarkUtils.php
+++ b/application/netscape/NetscapeBookmarkUtils.php
@@ -7,8 +7,10 @@ use DateTimeZone;
 use Exception;
 use Katzgrau\KLogger\Logger;
 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;
 
@@ -20,41 +22,39 @@ class NetscapeBookmarkUtils
 {
 
     /**
-     * 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 BookmarkServiceInterface $bookmarkService Link datastore
+     * @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                   $indexUrl        Absolute URL of the Shaarli index page
      *
-     * @throws Exception Invalid export selection
+     * @return array The bookmarks to be exported, with additional fields
+     *@throws Exception Invalid export selection
      *
-     * @return array The links to be exported, with additional fields
      */
-    public static function filterAndFormat($linkDb, $selection, $prependNoteUrl, $indexUrl)
-    {
+    public static function filterAndFormat(
+        $bookmarkService,
+        $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']) && $prependNoteUrl) {
+        foreach ($bookmarkService->search([], $selection) as $bookmark) {
+            $link = $formatter->format($bookmark);
+            $link['taglist'] = implode(',', $bookmark->getTags());
+            if ($bookmark->isNote() && $prependNoteUrl) {
                 $link['url'] = $indexUrl . $link['url'];
             }
 
@@ -69,9 +69,9 @@ class NetscapeBookmarkUtils
      *
      * @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    $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
@@ -91,7 +91,7 @@ class NetscapeBookmarkUtils
             $status .= vsprintf(
                 t(
                     'was successfully processed in %d seconds: '
-                    . '%d links imported, %d links overwritten, %d links skipped.'
+                    . '%d bookmarks imported, %d bookmarks overwritten, %d bookmarks skipped.'
                 ),
                 [$duration, $importCount, $overwriteCount, $skipCount]
             );
@@ -102,15 +102,15 @@ class NetscapeBookmarkUtils
     /**
      * 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 array                    $files           Server $_FILES parameters
+     * @param BookmarkServiceInterface $bookmarkService Loaded LinkDB instance
+     * @param ConfigManager            $conf            instance
+     * @param History                  $history         History instance
      *
      * @return string Summary of the bookmark import status
      */
-    public static function import($post, $files, $linkDb, $conf, $history)
+    public static function import($post, $files, $bookmarkService, $conf, $history)
     {
         $start = time();
         $filename = $files['filetoupload']['name'];
@@ -121,10 +121,10 @@ class NetscapeBookmarkUtils
             return self::importStatus($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 {
@@ -134,7 +134,7 @@ class NetscapeBookmarkUtils
             );
         }
 
-        // links are imported as public by default
+        // bookmarks are imported as public by default
         $defaultPrivacy = 0;
 
         $parser = new NetscapeBookmarkParser(
@@ -164,22 +164,18 @@ 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 = $bookmarkService->findByUrl($bkm['uri']);
+            $existingLink = $link !== null;
+            if (! $existingLink) {
+                $link = new Bookmark();
+            }
 
             if ($existingLink !== false) {
                 if ($overwrite === false) {
@@ -188,28 +184,25 @@ 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'], $conf->get('security.allowed_protocols'));
+            $link->setDescription($bkm['note']);
+            $link->setPrivate($private);
+            $link->setTagsString($bkm['tags']);
+
+            $bookmarkService->addOrSet($link, false);
             $importCount++;
         }
 
-        $linkDb->save($conf->get('resource.page_cache'));
+        $bookmarkService->save();
         $history->importLinks();
 
         $duration = time() - $start;
diff --git a/application/render/PageBuilder.php b/application/render/PageBuilder.php
index 3f86fc26..65e85aaf 100644
--- a/application/render/PageBuilder.php
+++ b/application/render/PageBuilder.php
@@ -5,7 +5,7 @@ namespace Shaarli\Render;
 use Exception;
 use RainTPL;
 use Shaarli\ApplicationUtils;
-use Shaarli\Bookmark\LinkDB;
+use Shaarli\Bookmark\BookmarkServiceInterface;
 use Shaarli\Config\ConfigManager;
 use Shaarli\Thumbnailer;
 
@@ -34,9 +34,9 @@ class PageBuilder
     protected $session;
 
     /**
-     * @var LinkDB $linkDB instance.
+     * @var BookmarkServiceInterface $bookmarkService instance.
      */
-    protected $linkDB;
+    protected $bookmarkService;
 
     /**
      * @var null|string XSRF token
@@ -52,18 +52,18 @@ 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;
     }
@@ -125,8 +125,8 @@ 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', $this->bookmarkService->bookmarksCountPerTag());
         }
 
         $this->tpl->assign(
@@ -141,6 +141,8 @@ class PageBuilder
             unset($_SESSION['warnings']);
         }
 
+        $this->tpl->assign('formatter', $this->conf->get('formatter', 'default'));
+
         // To be removed with a proper theme configuration.
         $this->tpl->assign('conf', $this->conf);
     }
diff --git a/application/updater/Updater.php b/application/updater/Updater.php
index beb9ea9b..95654d81 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\Config\ConfigManager;
-use Shaarli\Config\ConfigPhp;
-use Shaarli\Exceptions\IOException;
-use Shaarli\Thumbnailer;
+use Shaarli\Bookmark\BookmarkServiceInterface;
 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 $linkServices;
 
     /**
      * @var ConfigManager $conf Configuration Manager instance.
@@ -45,36 +34,27 @@ class Updater
     protected $isLoggedIn;
 
     /**
-     * @var array $_SESSION
-     */
-    protected $session;
-
-    /**
-     * @var ReflectionMethod[] List of current class methods.
+     * @var \ReflectionMethod[] List of current class methods.
      */
     protected $methods;
 
     /**
      * 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->linkServices = $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();
     }
 
@@ -96,12 +76,12 @@ 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(), $this->doneUpdates)
             ) {
                 continue;
@@ -114,7 +94,7 @@ class Updater
                 if ($res === true) {
                     $updatesRan[] = $method->getName();
                 }
-            } catch (Exception $e) {
+            } catch (\Exception $e) {
                 throw new UpdaterException($method, $e);
             }
         }
@@ -131,432 +111,4 @@ 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()
-    {
-        $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;
-    }
-
-    /**
-     * 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 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;
-    }
-
-    /**
-     * * 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) {
-            $this->session['warnings'][] = t(
-                'You have enabled or changed thumbnails mode. <a href="?do=thumbs_update">Please synchronize them</a>.'
-            );
-        }
-
-        return true;
-    }
-
-    /**
-     * Set sticky = false on all links
-     *
-     * @return bool true if the update is successful, false otherwise.
-     */
-    public function updateMethodSetSticky()
-    {
-        foreach ($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;
-    }
 }
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 . '.');
+        }
     }
 }