1 files changed, 301 insertions, 573 deletions

diff --git a/index.php b/index.php
index 29d67f62..633ab89e 100644
--- a/index.php
+++ b/index.php
@@ -28,7 +28,7 @@ if (date_default_timezone_get() == '') {
 define('WEB_PATH', substr($_SERVER['REQUEST_URI'], 0, 1+strrpos($_SERVER['REQUEST_URI'], '/', 0)));
 
 // High execution time in case of problematic imports/exports.
-ini_set('max_input_time','60');
+ini_set('max_input_time', '60');
 
 // Try to set max upload file size and read
 ini_set('memory_limit', '128M');
@@ -56,35 +56,38 @@ require_once 'inc/rain.tpl.class.php';
 require_once __DIR__ . '/vendor/autoload.php';
 
 // Shaarli library
-require_once 'application/ApplicationUtils.php';
-require_once 'application/Cache.php';
-require_once 'application/CachedPage.php';
+require_once 'application/bookmark/LinkUtils.php';
 require_once 'application/config/ConfigPlugin.php';
-require_once 'application/FeedBuilder.php';
+require_once 'application/feed/Cache.php';
+require_once 'application/http/HttpUtils.php';
+require_once 'application/http/UrlUtils.php';
+require_once 'application/updater/UpdaterUtils.php';
 require_once 'application/FileUtils.php';
-require_once 'application/History.php';
-require_once 'application/HttpUtils.php';
-require_once 'application/LinkDB.php';
-require_once 'application/LinkFilter.php';
-require_once 'application/LinkUtils.php';
-require_once 'application/NetscapeBookmarkUtils.php';
-require_once 'application/PageBuilder.php';
 require_once 'application/TimeZone.php';
-require_once 'application/Url.php';
 require_once 'application/Utils.php';
-require_once 'application/PluginManager.php';
-require_once 'application/Router.php';
-require_once 'application/Updater.php';
-use \Shaarli\Languages;
-use \Shaarli\ThemeUtils;
+
+use \Shaarli\ApplicationUtils;
+use \Shaarli\Bookmark\Exception\LinkNotFoundException;
+use \Shaarli\Bookmark\LinkDB;
 use \Shaarli\Config\ConfigManager;
+use \Shaarli\Feed\CachedPage;
+use \Shaarli\Feed\FeedBuilder;
+use \Shaarli\History;
+use \Shaarli\Languages;
+use \Shaarli\Netscape\NetscapeBookmarkUtils;
+use \Shaarli\Plugin\PluginManager;
+use \Shaarli\Render\PageBuilder;
+use \Shaarli\Render\ThemeUtils;
+use \Shaarli\Router;
 use \Shaarli\Security\LoginManager;
 use \Shaarli\Security\SessionManager;
+use \Shaarli\Thumbnailer;
+use \Shaarli\Updater\Updater;
 
 // Ensure the PHP version is supported
 try {
     ApplicationUtils::checkPHPVersion('5.5', PHP_VERSION);
-} catch(Exception $exc) {
+} catch (Exception $exc) {
     header('Content-Type: text/plain; charset=utf-8');
     echo $exc->getMessage();
     exit;
@@ -110,7 +113,7 @@ ini_set('session.use_trans_sid', false);
 
 session_name('shaarli');
 // Start session if needed (Some server auto-start sessions).
-if (session_id() == '') {
+if (session_status() == PHP_SESSION_NONE) {
     session_start();
 }
 
@@ -222,7 +225,6 @@ if (isset($_POST['login'])) {
                 $expirationTime,
                 WEB_PATH
             );
-
         } else {
             // Standard session expiration (=when browser closes)
             $expirationTime = 0;
@@ -256,7 +258,8 @@ if (isset($_POST['login'])) {
                 exit;
             }
         }
-        header('Location: ?'); exit;
+        header('Location: ?');
+        exit;
     } else {
         $loginManager->handleFailedLogin($_SERVER);
         $redir = '&username='. urlencode($_POST['login']);
@@ -277,7 +280,9 @@ if (isset($_POST['login'])) {
 // ------------------------------------------------------------------------------------------
 // Token management for XSRF protection
 // Token should be used in any form which acts on data (create,update,delete,import...).
-if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
+if (!isset($_SESSION['tokens'])) {
+    $_SESSION['tokens']=array();  // Token are attached to the session.
+}
 
 /**
  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
@@ -287,13 +292,14 @@ if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are atta
  * @param ConfigManager $conf         Configuration Manager instance
  * @param LoginManager  $loginManager LoginManager instance
  */
-function showDailyRSS($conf, $loginManager) {
+function showDailyRSS($conf, $loginManager)
+{
     // Cache system
     $query = $_SERVER['QUERY_STRING'];
     $cache = new CachedPage(
         $conf->get('config.PAGE_CACHE'),
         page_url($_SERVER),
-        startsWith($query,'do=dailyrss') && !$loginManager->isLoggedIn()
+        startsWith($query, 'do=dailyrss') && !$loginManager->isLoggedIn()
     );
     $cached = $cache->cachedVersion();
     if (!empty($cached)) {
@@ -355,7 +361,6 @@ function showDailyRSS($conf, $loginManager) {
                 $conf->get('redirector.url'),
                 $conf->get('redirector.encode_url')
             );
-            $link['thumbnail'] = thumbnail($conf, $link['url']);
             $link['timestamp'] = $link['created']->getTimestamp();
             if (startsWith($link['url'], '?')) {
                 $link['url'] = index_url($_SERVER) . $link['url'];  // make permalink URL absolute
@@ -370,6 +375,7 @@ function showDailyRSS($conf, $loginManager) {
         $tpl->assign('links', $links);
         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
+        $tpl->assign('index_url', $pageaddr);
         $html = $tpl->draw('dailyrss', true);
 
         echo $html . PHP_EOL;
@@ -394,7 +400,7 @@ function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager, $loginManager)
 {
     $day = date('Ymd', strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
     if (isset($_GET['day'])) {
-      $day = $_GET['day'];
+        $day = $_GET['day'];
     }
 
     $days = $LINKSDB->days();
@@ -412,7 +418,7 @@ function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager, $loginManager)
              $previousday=$days[$i - 1];
         }
         if ($i < count($days) - 1) {
-          $nextday = $days[$i + 1];
+            $nextday = $days[$i + 1];
         }
     }
     try {
@@ -423,8 +429,8 @@ function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager, $loginManager)
     }
 
     // We pre-format some fields for proper output.
-    foreach($linksToDisplay as $key => $link) {
-        $taglist = explode(' ',$link['tags']);
+    foreach ($linksToDisplay as $key => $link) {
+        $taglist = explode(' ', $link['tags']);
         uasort($taglist, 'strcasecmp');
         $linksToDisplay[$key]['taglist']=$taglist;
         $linksToDisplay[$key]['formatedDescription'] = format_description(
@@ -432,7 +438,6 @@ function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager, $loginManager)
             $conf->get('redirector.url'),
             $conf->get('redirector.encode_url')
         );
-        $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
         $linksToDisplay[$key]['timestamp'] =  $link['created']->getTimestamp();
     }
 
@@ -457,14 +462,14 @@ function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager, $loginManager)
     */
     $columns = array(array(), array(), array()); // Entries to display, for each column.
     $fill = array(0, 0, 0);  // Rough estimate of columns fill.
-    foreach($data['linksToDisplay'] as $key => $link) {
+    foreach ($data['linksToDisplay'] as $key => $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($link['description'])) / 836;
         if ($link['thumbnail']) {
-          $length += 100; // 1 thumbnails roughly takes 100 pixels height.
+            $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.
@@ -492,8 +497,9 @@ function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager, $loginManager)
  * @param ConfigManager $conf    Configuration Manager instance.
  * @param PluginManager $pluginManager Plugin Manager instance.
  */
-function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager) {
-    buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager, $loginManager);
+function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager)
+{
+    buildLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager);
     $PAGE->renderPage('linklist');
 }
 
@@ -513,7 +519,8 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         read_updates_file($conf->get('resource.updates')),
         $LINKSDB,
         $conf,
-        $loginManager->isLoggedIn()
+        $loginManager->isLoggedIn(),
+        $_SESSION
     );
     try {
         $newUpdates = $updater->update();
@@ -523,12 +530,11 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
                 $updater->getDoneUpdates()
             );
         }
-    }
-    catch(Exception $e) {
+    } catch (Exception $e) {
         die($e->getMessage());
     }
 
-    $PAGE = new PageBuilder($conf, $LINKSDB, $sessionManager->generateToken(), $loginManager->isLoggedIn());
+    $PAGE = new PageBuilder($conf, $_SESSION, $LINKSDB, $sessionManager->generateToken(), $loginManager->isLoggedIn());
     $PAGE->assign('linkcount', count($LINKSDB));
     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
     $PAGE->assign('plugin_errors', $pluginManager->getErrors());
@@ -537,8 +543,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
     $targetPage = Router::findPage($query, $_GET, $loginManager->isLoggedIn());
 
-    if (
-        // if the user isn't logged in
+    if (// if the user isn't logged in
         !$loginManager->isLoggedIn() &&
         // and Shaarli doesn't have public content...
         $conf->get('privacy.hide_public_links') &&
@@ -562,9 +567,11 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         'footer',
     );
 
-    foreach($common_hooks as $name) {
+    foreach ($common_hooks as $name) {
         $plugin_data = array();
-        $pluginManager->executeHooks('render_' . $name, $plugin_data,
+        $pluginManager->executeHooks(
+            'render_' . $name,
+            $plugin_data,
             array(
                 'target' => $targetPage,
                 'loggedin' => $loginManager->isLoggedIn()
@@ -574,13 +581,15 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- Display login form.
-    if ($targetPage == Router::$PAGE_LOGIN)
-    {
-        if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
+    if ($targetPage == Router::$PAGE_LOGIN) {
+        if ($conf->get('security.open_shaarli')) {
+            header('Location: ?');
+            exit;
+        }  // No need to login for open Shaarli
         if (isset($_GET['username'])) {
             $PAGE->assign('username', escape($_GET['username']));
         }
-        $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
+        $PAGE->assign('returnurl', (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
         // add default state of the 'remember me' checkbox
         $PAGE->assign('remember_user_default', $conf->get('privacy.remember_user_default'));
         $PAGE->assign('user_can_login', $loginManager->canLogin($_SERVER));
@@ -589,8 +598,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         exit;
     }
     // -------- User wants to logout.
-    if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
-    {
+    if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout')) {
         invalidateCaches($conf->get('resource.page_cache'));
         $sessionManager->logout();
         setcookie(LoginManager::$STAY_SIGNED_IN_COOKIE, 'false', 0, WEB_PATH);
@@ -599,21 +607,23 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- Picture wall
-    if ($targetPage == Router::$PAGE_PICWALL)
-    {
+    if ($targetPage == Router::$PAGE_PICWALL) {
+        $PAGE->assign('pagetitle', t('Picture wall') .' - '. $conf->get('general.title', 'Shaarli'));
+        if (! $conf->get('thumbnails.mode', Thumbnailer::MODE_NONE) === Thumbnailer::MODE_NONE) {
+            $PAGE->assign('linksToDisplay', []);
+            $PAGE->renderPage('picwall');
+            exit;
+        }
+
         // Optionally filter the results:
         $links = $LINKSDB->filterSearch($_GET);
         $linksToDisplay = array();
 
         // Get only links which have a thumbnail.
-        foreach($links as $link)
-        {
-            $permalink='?'.$link['shorturl'];
-            $thumb=lazyThumbnail($conf, $link['url'],$permalink);
-            if ($thumb!='') // Only output links which have a thumbnail.
-            {
-                $link['thumbnail']=$thumb; // Thumbnail HTML code.
-                $linksToDisplay[]=$link; // Add to array.
+        // Note: we do not retrieve thumbnails here, the request is too heavy.
+        foreach ($links as $key => $link) {
+            if (isset($link['thumbnail']) && $link['thumbnail'] !== false) {
+                $linksToDisplay[] = $link; // Add to array.
             }
         }
 
@@ -626,14 +636,13 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             $PAGE->assign($key, $value);
         }
 
-        $PAGE->assign('pagetitle', t('Picture wall') .' - '. $conf->get('general.title', 'Shaarli'));
+
         $PAGE->renderPage('picwall');
         exit;
     }
 
     // -------- Tag cloud
-    if ($targetPage == Router::$PAGE_TAGCLOUD)
-    {
+    if ($targetPage == Router::$PAGE_TAGCLOUD) {
         $visibility = ! empty($_SESSION['visibility']) ? $_SESSION['visibility'] : '';
         $filteringTags = isset($_GET['searchtags']) ? explode(' ', $_GET['searchtags']) : [];
         $tags = $LINKSDB->linksCountPerTag($filteringTags, $visibility);
@@ -648,7 +657,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         alphabetical_sort($tags, false, true);
 
         $tagList = array();
-        foreach($tags as $key => $value) {
+        foreach ($tags as $key => $value) {
             if (in_array($key, $filteringTags)) {
                 continue;
             }
@@ -680,8 +689,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- Tag list
-    if ($targetPage == Router::$PAGE_TAGLIST)
-    {
+    if ($targetPage == Router::$PAGE_TAGLIST) {
         $visibility = ! empty($_SESSION['visibility']) ? $_SESSION['visibility'] : '';
         $filteringTags = isset($_GET['searchtags']) ? explode(' ', $_GET['searchtags']) : [];
         $tags = $LINKSDB->linksCountPerTag($filteringTags, $visibility);
@@ -727,7 +735,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         $cache = new CachedPage(
             $conf->get('resource.page_cache'),
             page_url($_SERVER),
-            startsWith($query,'do='. $targetPage) && !$loginManager->isLoggedIn()
+            startsWith($query, 'do='. $targetPage) && !$loginManager->isLoggedIn()
         );
         $cached = $cache->cachedVersion();
         if (!empty($cached)) {
@@ -765,11 +773,14 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
-    if (isset($_GET['addtag']))
-    {
+    if (isset($_GET['addtag'])) {
         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
-        if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
-        parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
+        if (empty($_SERVER['HTTP_REFERER'])) {
+            // In case browser does not send HTTP_REFERER
+            header('Location: ?searchtags='.urlencode($_GET['addtag']));
+            exit;
+        }
+        parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 
         // Prevent redirection loop
         if (isset($params['addtag'])) {
@@ -793,12 +804,14 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         // Append the tag if necessary
         if (empty($params['searchtags'])) {
             $params['searchtags'] = trim($_GET['addtag']);
-        }
-        elseif ($addtag) {
+        } elseif ($addtag) {
             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
         }
 
-        unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
+        // We also remove page (keeping the same page has no sense, since the
+        // results are different)
+        unset($params['page']);
+
         header('Location: ?'.http_build_query($params));
         exit;
     }
@@ -823,13 +836,15 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             $tags = explode(' ', $params['searchtags']);
             // Remove value from array $tags.
             $tags = array_diff($tags, array($_GET['removetag']));
-            $params['searchtags'] = implode(' ',$tags);
+            $params['searchtags'] = implode(' ', $tags);
 
             if (empty($params['searchtags'])) {
                 unset($params['searchtags']);
             }
 
-            unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
+            // We also remove page (keeping the same page has no sense, since
+            // the results are different)
+            unset($params['page']);
         }
         header('Location: ?'.http_build_query($params));
         exit;
@@ -892,12 +907,10 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- Handle other actions allowed for non-logged in users:
-    if (!$loginManager->isLoggedIn())
-    {
+    if (!$loginManager->isLoggedIn()) {
         // User tries to post new link but is not logged in:
         // Show login screen, then redirect to ?post=...
-        if (isset($_GET['post']))
-        {
+        if (isset($_GET['post'])) {
             header( // Redirect to login page, then back to post link.
                 'Location: ?do=login&post='.urlencode($_GET['post']).
                 (!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').
@@ -920,8 +933,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     // -------- All other functions are reserved for the registered user:
 
     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
-    if ($targetPage == Router::$PAGE_TOOLS)
-    {
+    if ($targetPage == Router::$PAGE_TOOLS) {
         $data = [
             'pageabsaddr' => index_url($_SERVER),
             'sslenabled' => is_https($_SERVER),
@@ -938,30 +950,40 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User wants to change his/her password.
-    if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
-    {
+    if ($targetPage == Router::$PAGE_CHANGEPASSWORD) {
         if ($conf->get('security.open_shaarli')) {
             die(t('You are not supposed to change a password on an Open Shaarli.'));
         }
 
-        if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
-        {
-            if (!$sessionManager->checkToken($_POST['token'])) die(t('Wrong token.')); // Go away!
+        if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword'])) {
+            if (!$sessionManager->checkToken($_POST['token'])) {
+                die(t('Wrong token.')); // Go away!
+            }
 
             // Make sure old password is correct.
-            $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
-            if ($oldhash!= $conf->get('credentials.hash')) {
-                echo '<script>alert("'. t('The old password is not correct.') .'");document.location=\'?do=changepasswd\';</script>';
+            $oldhash = sha1(
+                $_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt')
+            );
+            if ($oldhash != $conf->get('credentials.hash')) {
+                echo '<script>alert("'
+                    . t('The old password is not correct.')
+                    .'");document.location=\'?do=changepasswd\';</script>';
                 exit;
             }
             // Save new password
             // Salt renders rainbow-tables attacks useless.
             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
-            $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
+            $conf->set(
+                'credentials.hash',
+                sha1(
+                    $_POST['setpassword']
+                    . $conf->get('credentials.login')
+                    . $conf->get('credentials.salt')
+                )
+            );
             try {
                 $conf->write($loginManager->isLoggedIn());
-            }
-            catch(Exception $e) {
+            } catch (Exception $e) {
                 error_log(
                     'ERROR while writing config file after changing password.' . PHP_EOL .
                     $e->getMessage()
@@ -973,9 +995,8 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             }
             echo '<script>alert("'. t('Your password has been changed') .'");document.location=\'?do=tools\';</script>';
             exit;
-        }
-        else // show the change password form.
-        {
+        } else {
+            // show the change password form.
             $PAGE->assign('pagetitle', t('Change password') .' - '. $conf->get('general.title', 'Shaarli'));
             $PAGE->renderPage('changepassword');
             exit;
@@ -983,10 +1004,8 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User wants to change configuration
-    if ($targetPage == Router::$PAGE_CONFIGURE)
-    {
-        if (!empty($_POST['title']) )
-        {
+    if ($targetPage == Router::$PAGE_CONFIGURE) {
+        if (!empty($_POST['title'])) {
             if (!$sessionManager->checkToken($_POST['token'])) {
                 die(t('Wrong token.')); // Go away!
             }
@@ -1009,12 +1028,22 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             $conf->set('api.secret', escape($_POST['apiSecret']));
             $conf->set('translation.language', escape($_POST['language']));
 
+            $thumbnailsMode = extension_loaded('gd') ? $_POST['enableThumbnails'] : Thumbnailer::MODE_NONE;
+            if ($thumbnailsMode !== Thumbnailer::MODE_NONE
+                && $thumbnailsMode !== $conf->get('thumbnails.mode', Thumbnailer::MODE_NONE)
+            ) {
+                $_SESSION['warnings'][] = t(
+                    'You have enabled or changed thumbnails mode. '
+                    .'<a href="?do=thumbs_update">Please synchronize them</a>.'
+                );
+            }
+            $conf->set('thumbnails.mode', $thumbnailsMode);
+
             try {
                 $conf->write($loginManager->isLoggedIn());
                 $history->updateSettings();
                 invalidateCaches($conf->get('resource.page_cache'));
-            }
-            catch(Exception $e) {
+            } catch (Exception $e) {
                 error_log(
                     'ERROR while writing config file after configuration update.' . PHP_EOL .
                     $e->getMessage()
@@ -1026,9 +1055,8 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             }
             echo '<script>alert("'. t('Configuration was saved.') .'");document.location=\'?do=configure\';</script>';
             exit;
-        }
-        else // Show the configuration form.
-        {
+        } else {
+            // Show the configuration form.
             $PAGE->assign('title', $conf->get('general.title'));
             $PAGE->assign('theme', $conf->get('resource.theme'));
             $PAGE->assign('theme_available', ThemeUtils::getThemes($conf->get('resource.raintpl_tpl')));
@@ -1047,6 +1075,8 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             $PAGE->assign('api_secret', $conf->get('api.secret'));
             $PAGE->assign('languages', Languages::getAvailableLanguages());
             $PAGE->assign('language', $conf->get('translation.language'));
+            $PAGE->assign('gd_enabled', extension_loaded('gd'));
+            $PAGE->assign('thumbnails_mode', $conf->get('thumbnails.mode', Thumbnailer::MODE_NONE));
             $PAGE->assign('pagetitle', t('Configure') .' - '. $conf->get('general.title', 'Shaarli'));
             $PAGE->renderPage('configure');
             exit;
@@ -1054,8 +1084,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User wants to rename a tag or delete it
-    if ($targetPage == Router::$PAGE_CHANGETAG)
-    {
+    if ($targetPage == Router::$PAGE_CHANGETAG) {
         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
             $PAGE->assign('fromtag', ! empty($_GET['fromtag']) ? escape($_GET['fromtag']) : '');
             $PAGE->assign('pagetitle', t('Manage tags') .' - '. $conf->get('general.title', 'Shaarli'));
@@ -1067,7 +1096,8 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             die(t('Wrong token.'));
         }
 
-        $alteredLinks = $LINKSDB->renameTag(escape($_POST['fromtag']), escape($_POST['totag']));
+        $toTag = isset($_POST['totag']) ? escape($_POST['totag']) : null;
+        $alteredLinks = $LINKSDB->renameTag(escape($_POST['fromtag']), $toTag);
         $LINKSDB->save($conf->get('resource.page_cache'));
         foreach ($alteredLinks as $link) {
             $history->updateLink($link);
@@ -1083,16 +1113,14 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User wants to add a link without using the bookmarklet: Show form.
-    if ($targetPage == Router::$PAGE_ADDLINK)
-    {
+    if ($targetPage == Router::$PAGE_ADDLINK) {
         $PAGE->assign('pagetitle', t('Shaare a new link') .' - '. $conf->get('general.title', 'Shaarli'));
         $PAGE->renderPage('addlink');
         exit;
     }
 
     // -------- User clicked the "Save" button when editing a link: Save link to database.
-    if (isset($_POST['save_edit']))
-    {
+    if (isset($_POST['save_edit'])) {
         // Go away!
         if (! $sessionManager->checkToken($_POST['token'])) {
             die(t('Wrong token.'));
@@ -1103,7 +1131,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         // Linkdate is kept here to:
         //   - use the same permalink for notes as they're displayed when creating them
         //   - let users hack creation date of their posts
-        //     See: https://shaarli.readthedocs.io/en/master/Various-hacks/#changing-the-timestamp-for-a-shaare
+        //     See: https://shaarli.readthedocs.io/en/master/guides/various-hacks/#changing-the-timestamp-for-a-shaare
         $linkdate = escape($_POST['lf_linkdate']);
         if (isset($LINKSDB[$id])) {
             // Edit
@@ -1148,6 +1176,11 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             $link['title'] = $link['url'];
         }
 
+        if ($conf->get('thumbnails.mode', Thumbnailer::MODE_NONE) !== Thumbnailer::MODE_NONE) {
+            $thumbnailer = new Thumbnailer($conf);
+            $link['thumbnail'] = $thumbnailer->get($url);
+        }
+
         $pluginManager->executeHooks('save_link', $link);
 
         $LINKSDB[$id] = $link;
@@ -1174,14 +1207,16 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User clicked the "Cancel" button when editing a link.
-    if (isset($_POST['cancel_edit']))
-    {
+    if (isset($_POST['cancel_edit'])) {
         $id = isset($_POST['lf_id']) ? (int) escape($_POST['lf_id']) : false;
         if (! isset($LINKSDB[$id])) {
             header('Location: ?');
         }
         // If we are called from the bookmarklet, we must close the popup:
-        if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
+        if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
+            echo '<script>self.close();</script>';
+            exit;
+        }
         $link = $LINKSDB[$id];
         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
         // Scroll to the link which has been edited.
@@ -1192,8 +1227,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
-    if ($targetPage == Router::$PAGE_DELETELINK)
-    {
+    if ($targetPage == Router::$PAGE_DELETELINK) {
         if (! $sessionManager->checkToken($_GET['token'])) {
             die(t('Wrong token.'));
         }
@@ -1207,28 +1241,31 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             $ids = [$ids];
         }
         // assert at least one id is given
-        if(!count($ids)){
+        if (!count($ids)) {
             die('no id provided');
         }
         foreach ($ids as $id) {
             $id = (int) escape($id);
             $link = $LINKSDB[$id];
             $pluginManager->executeHooks('delete_link', $link);
+            $history->deleteLink($link);
             unset($LINKSDB[$id]);
         }
         $LINKSDB->save($conf->get('resource.page_cache')); // save to disk
-        $history->deleteLink($link);
 
         // If we are called from the bookmarklet, we must close the popup:
-        if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
+        if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
+            echo '<script>self.close();</script>';
+            exit;
+        }
 
         $location = '?';
         if (isset($_SERVER['HTTP_REFERER'])) {
             // Don't redirect to where we were previously if it was a permalink or an edit_link, because it would 404.
             $location = generateLocation(
-                    $_SERVER['HTTP_REFERER'],
-                    $_SERVER['HTTP_HOST'],
-                    ['delete_link', 'edit_link', $link['shorturl']]
+                $_SERVER['HTTP_REFERER'],
+                $_SERVER['HTTP_HOST'],
+                ['delete_link', 'edit_link', $link['shorturl']]
             );
         }
 
@@ -1237,11 +1274,13 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
     }
 
     // -------- User clicked the "EDIT" button on a link: Display link edit form.
-    if (isset($_GET['edit_link']))
-    {
+    if (isset($_GET['edit_link'])) {
         $id = (int) escape($_GET['edit_link']);
         $link = $LINKSDB[$id];  // Read database
-        if (!$link) { header('Location: ?'); exit; } // Link not found in database.
+        if (!$link) {
+            header('Location: ?');
+            exit;
+        } // Link not found in database.
         $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
         $data = array(
             'link' => $link,
@@ -1267,8 +1306,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         $link_is_new = false;
         // Check if URL is not already in database (in this case, we will edit the existing link)
         $link = $LINKSDB->getLinkFromUrl($url);
-        if (! $link)
-        {
+        if (! $link) {
             $link_is_new = true;
             $linkdate = strval(date(LinkDB::LINK_DATE_FORMAT));
             // Get title if it was provided in URL (by the bookmarklet).
@@ -1277,7 +1315,9 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
-            // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
+
+            // If this is an HTTP(S) link, we try go get the page to extract
+            // the title (otherwise we will to straight to the edit form.)
             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
                 // Short timeout to keep the application responsive
                 // The callback will fill $charset and $title with data from the downloaded page.
@@ -1330,6 +1370,25 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         exit;
     }
 
+    if ($targetPage == Router::$PAGE_PINLINK) {
+        if (! isset($_GET['id']) || empty($LINKSDB[$_GET['id']])) {
+            // FIXME! Use a proper error system.
+            $msg = t('Invalid link ID provided');
+            echo '<script>alert("'. $msg .'");document.location=\''. index_url($_SERVER) .'\';</script>';
+            exit;
+        }
+        if (! $sessionManager->checkToken($_GET['token'])) {
+            die('Wrong token.');
+        }
+
+        $link = $LINKSDB[$_GET['id']];
+        $link['sticky'] = ! $link['sticky'];
+        $LINKSDB[(int) $_GET['id']] = $link;
+        $LINKSDB->save($conf->get('resource.page_cache'));
+        header('Location: '.index_url($_SERVER));
+        exit;
+    }
+
     if ($targetPage == Router::$PAGE_EXPORT) {
         // Export links as a Netscape Bookmarks file
 
@@ -1366,7 +1425,7 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         header('Content-Type: text/html; charset=utf-8');
         header(
             'Content-disposition: attachment; filename=bookmarks_'
-           .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
+            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
         );
         $PAGE->assign('date', $now->format(DateTime::RFC822));
         $PAGE->assign('eol', PHP_EOL);
@@ -1434,14 +1493,20 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         $pluginMeta = $pluginManager->getPluginsMeta();
 
         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
-        $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
+        $enabledPlugins = array_filter($pluginMeta, function ($v) {
+            return $v['order'] !== false;
+        });
         // Load parameters.
         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
         uasort(
             $enabledPlugins,
-            function($a, $b) { return $a['order'] - $b['order']; }
+            function ($a, $b) {
+                return $a['order'] - $b['order'];
+            }
         );
-        $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
+        $disabledPlugins = array_filter($pluginMeta, function ($v) {
+            return $v['order'] === false;
+        });
 
         $PAGE->assign('enabledPlugins', $enabledPlugins);
         $PAGE->assign('disabledPlugins', $disabledPlugins);
@@ -1458,21 +1523,23 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
                 foreach ($_POST as $param => $value) {
                     $conf->set('plugins.'. $param, escape($value));
                 }
-            }
-            else {
+            } else {
                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
             }
             $conf->write($loginManager->isLoggedIn());
             $history->updateSettings();
-        }
-        catch (Exception $e) {
+        } catch (Exception $e) {
             error_log(
                 'ERROR while saving plugin configuration:.' . PHP_EOL .
                 $e->getMessage()
             );
 
             // TODO: do not handle exceptions/errors in JS.
-            echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
+            echo '<script>alert("'
+                . $e->getMessage()
+                .'");document.location=\'?do='
+                . Router::$PAGE_PLUGINSADMIN
+                .'\';</script>';
             exit;
         }
         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
@@ -1486,6 +1553,43 @@ function renderPage($conf, $pluginManager, $LINKSDB, $history, $sessionManager,
         exit;
     }
 
+    // -------- Thumbnails Update
+    if ($targetPage == Router::$PAGE_THUMBS_UPDATE) {
+        $ids = [];
+        foreach ($LINKSDB as $link) {
+            // A note or not HTTP(S)
+            if ($link['url'][0] === '?' || ! startsWith(strtolower($link['url']), 'http')) {
+                continue;
+            }
+            $ids[] = $link['id'];
+        }
+        $PAGE->assign('ids', $ids);
+        $PAGE->assign('pagetitle', t('Thumbnails update') .' - '. $conf->get('general.title', 'Shaarli'));
+        $PAGE->renderPage('thumbnails');
+        exit;
+    }
+
+    // -------- Single Thumbnail Update
+    if ($targetPage == Router::$AJAX_THUMB_UPDATE) {
+        if (! isset($_POST['id']) || ! ctype_digit($_POST['id'])) {
+            http_response_code(400);
+            exit;
+        }
+        $id = (int) $_POST['id'];
+        if (empty($LINKSDB[$id])) {
+            http_response_code(404);
+            exit;
+        }
+        $thumbnailer = new Thumbnailer($conf);
+        $link = $LINKSDB[$id];
+        $link['thumbnail'] = $thumbnailer->get($link['url']);
+        $LINKSDB[$id] = $link;
+        $LINKSDB->save($conf->get('resource.page_cache'));
+
+        echo json_encode($link);
+        exit;
+    }
+
     // -------- Otherwise, simply display search form and links:
     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager);
     exit;
@@ -1549,9 +1653,14 @@ function buildLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager)
     // Start index.
     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
     $end = $i + $_SESSION['LINKS_PER_PAGE'];
+
+    $thumbnailsEnabled = $conf->get('thumbnails.mode', Thumbnailer::MODE_NONE) !== Thumbnailer::MODE_NONE;
+    if ($thumbnailsEnabled) {
+        $thumbnailer = new Thumbnailer($conf);
+    }
+
     $linkDisp = array();
-    while ($i<$end && $i<count($keys))
-    {
+    while ($i<$end && $i<count($keys)) {
         $link = $linksToDisplay[$keys[$i]];
         $link['description'] = format_description(
             $link['description'],
@@ -1569,9 +1678,21 @@ function buildLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager)
         $taglist = preg_split('/\s+/', $link['tags'], -1, PREG_SPLIT_NO_EMPTY);
         uasort($taglist, 'strcasecmp');
         $link['taglist'] = $taglist;
+
+        // Logged in, thumbnails enabled, not a note,
+        // and (never retrieved yet or no valid cache file)
+        if ($loginManager->isLoggedIn() && $thumbnailsEnabled && $link['url'][0] != '?'
+            && (! isset($link['thumbnail']) || ($link['thumbnail'] !== false && ! is_file($link['thumbnail'])))
+        ) {
+            $elem = $LINKSDB[$keys[$i]];
+            $elem['thumbnail'] = $thumbnailer->get($link['url']);
+            $LINKSDB[$keys[$i]] = $elem;
+            $updateDB = true;
+            $link['thumbnail'] = $elem['thumbnail'];
+        }
+
         // Check for both signs of a note: starting with ? and 7 chars long.
-        if ($link['url'][0] === '?' &&
-            strlen($link['url']) === 7) {
+        if ($link['url'][0] === '?' && strlen($link['url']) === 7) {
             $link['url'] = index_url($_SERVER) . $link['url'];
         }
 
@@ -1579,6 +1700,11 @@ function buildLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager)
         $i++;
     }
 
+    // If we retrieved new thumbnails, we update the database.
+    if (!empty($updateDB)) {
+        $LINKSDB->save($conf->get('resource.page_cache'));
+    }
+
     // Compute paging navigation
     $searchtagsUrl = $searchtags === '' ? '' : '&searchtags=' . urlencode($searchtags);
     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
@@ -1630,194 +1756,6 @@ function buildLinkList($PAGE, $LINKSDB, $conf, $pluginManager, $loginManager)
 }
 
 /**
- * Compute the thumbnail for a link.
- *
- * With a link to the original URL.
- * Understands various services (youtube.com...)
- * Input: $url = URL for which the thumbnail must be found.
- *        $href = if provided, this URL will be followed instead of $url
- * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
- * Some of them may be missing.
- * Return an empty array if no thumbnail available.
- *
- * @param ConfigManager $conf Configuration Manager instance.
- * @param string        $url
- * @param string|bool   $href
- *
- * @return array
- */
-function computeThumbnail($conf, $url, $href = false)
-{
-    if (!$conf->get('thumbnail.enable_thumbnails')) return array();
-    if ($href==false) $href=$url;
-
-    // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
-    // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
-    //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
-    $domain = parse_url($url,PHP_URL_HOST);
-    if ($domain=='youtube.com' || $domain=='www.youtube.com')
-    {
-        parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
-        if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
-                                               'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
-    }
-    if ($domain=='youtu.be') // Youtube short links
-    {
-        $path = parse_url($url,PHP_URL_PATH);
-        return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
-                     'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
-    }
-    if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
-    {
-        parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
-        if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
-                                                                    'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
-    }
-
-    if ($domain=='imgur.com')
-    {
-        $path = parse_url($url,PHP_URL_PATH);
-        if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
-        if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
-                                                  'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
-        if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
-                                                        'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
-
-        if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
-                                                     'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
-    }
-    if ($domain=='i.imgur.com')
-    {
-        $pi = pathinfo(parse_url($url,PHP_URL_PATH));
-        if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
-                                                  'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
-    }
-    if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
-    {
-        if (strpos($url,'dailymotion.com/video/')!==false)
-        {
-            $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
-            return array('src'=>$thumburl,
-                         'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
-        }
-    }
-    if (endsWith($domain,'.imageshack.us'))
-    {
-        $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
-        if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
-        {
-            $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
-            return array('src'=>$thumburl,
-                         'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
-        }
-    }
-
-    // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
-    // So we deport the thumbnail generation in order not to slow down page generation
-    // (and we also cache the thumbnail)
-
-    if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
-
-    if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
-        || $domain=='vimeo.com'
-        || $domain=='ted.com' || endsWith($domain,'.ted.com')
-        || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
-    )
-    {
-        if ($domain=='vimeo.com')
-        {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
-            $path = parse_url($url,PHP_URL_PATH);
-            if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
-        }
-        if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
-        {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
-            $path = parse_url($url,PHP_URL_PATH);
-            if (!preg_match('!/\d+.+?!',$path)) return array();
-        }
-        if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
-        {   // Make sure this TED URL points to a video (/talks/...)
-            $path = parse_url($url,PHP_URL_PATH);
-            if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
-        }
-        $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
-        return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
-                     'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
-    }
-
-    // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
-    // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
-    // But using the extension will do.
-    $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
-    if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
-    {
-        $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
-        return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
-                     'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
-    }
-    return array(); // No thumbnail.
-
-}
-
-
-// Returns the HTML code to display a thumbnail for a link
-// with a link to the original URL.
-// Understands various services (youtube.com...)
-// Input: $url = URL for which the thumbnail must be found.
-//        $href = if provided, this URL will be followed instead of $url
-// Returns '' if no thumbnail available.
-function thumbnail($url,$href=false)
-{
-    // FIXME!
-    global $conf;
-    $t = computeThumbnail($conf, $url,$href);
-    if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
-
-    $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
-    if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
-    if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
-    if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
-    if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
-    $html.='></a>';
-    return $html;
-}
-
-// Returns the HTML code to display a thumbnail for a link
-// for the picture wall (using lazy image loading)
-// Understands various services (youtube.com...)
-// Input: $url = URL for which the thumbnail must be found.
-//        $href = if provided, this URL will be followed instead of $url
-// Returns '' if no thumbnail available.
-function lazyThumbnail($conf, $url,$href=false)
-{
-    // FIXME!
-    global $conf;
-    $t = computeThumbnail($conf, $url,$href);
-    if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
-
-    $html='<a href="'.escape($t['href']).'">';
-
-    // Lazy image
-    $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
-
-    if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
-    if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
-    if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
-    if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
-    $html.='>';
-
-    // No-JavaScript fallback.
-    $html.='<noscript><img src="'.escape($t['src']).'"';
-    if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
-    if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
-    if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
-    if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
-    $html.='></noscript></a>';
-
-    return $html;
-}
-
-
-/**
  * Installation
  * This function should NEVER be called if the file data/config.php exists.
  *
@@ -1825,16 +1763,19 @@ function lazyThumbnail($conf, $url,$href=false)
  * @param SessionManager $sessionManager SessionManager instance
  * @param LoginManager   $loginManager   LoginManager instance
  */
-function install($conf, $sessionManager, $loginManager) {
+function install($conf, $sessionManager, $loginManager)
+{
     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
-    if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
+    if (endsWith($_SERVER['HTTP_HOST'], '.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) {
+        mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions', 0705);
+    }
 
 
     // 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 (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
-    {
+    if (isset($_GET['test_session'])
+        && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working')) {
         // Step 2: Check if data in session is correct.
         $msg = t(
             '<pre>Sessions do not seem to work correctly on your server.<br>'.
@@ -1850,19 +1791,18 @@ function install($conf, $sessionManager, $loginManager) {
         echo '<br><a href="?">'. t('Click to try again.') .'</a></pre>';
         die;
     }
-    if (!isset($_SESSION['session_tested']))
-    {   // Step 1 : Try to store data in session and reload page.
+    if (!isset($_SESSION['session_tested'])) {
+        // Step 1 : Try to store data in session and reload page.
         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
     }
-    if (isset($_GET['test_session']))
-    {   // Step 3: Sessions are OK. Remove test parameter from URL.
+    if (isset($_GET['test_session'])) {
+        // Step 3: Sessions are OK. Remove test parameter from URL.
         header('Location: '.index_url($_SERVER));
     }
 
 
-    if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
-    {
+    if (!empty($_POST['setlogin']) && !empty($_POST['setpassword'])) {
         $tz = 'UTC';
         if (!empty($_POST['continent']) && !empty($_POST['city'])
             && isTimeZoneValid($_POST['continent'], $_POST['city'])
@@ -1893,22 +1833,24 @@ function install($conf, $sessionManager, $loginManager) {
         try {
             // Everything is ok, let's create config file.
             $conf->write($loginManager->isLoggedIn());
-        }
-        catch(Exception $e) {
+        } catch (Exception $e) {
             error_log(
-                    'ERROR while writing config file after installation.' . PHP_EOL .
+                'ERROR while writing config file after installation.' . PHP_EOL .
                     $e->getMessage()
-                );
+            );
 
             // TODO: do not handle exceptions/errors in JS.
             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
             exit;
         }
-        echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
+        echo '<script>alert('
+            .'"Shaarli is now configured. '
+            .'Please enter your login/password and start shaaring your links!"'
+            .');document.location=\'?do=login\';</script>';
         exit;
     }
 
-    $PAGE = new PageBuilder($conf, null, $sessionManager->generateToken());
+    $PAGE = new PageBuilder($conf, $_SESSION, null, $sessionManager->generateToken());
     list($continents, $cities) = generateTimeZoneData(timezone_identifiers_list(), date_default_timezone_get());
     $PAGE->assign('continents', $continents);
     $PAGE->assign('cities', $cities);
@@ -1917,240 +1859,18 @@ function install($conf, $sessionManager, $loginManager) {
     exit;
 }
 
-/**
- * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
- * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
- * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
- * This function is called by passing the URL:
- * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
- * [URL] is the URL of the link (e.g. a flickr page)
- * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
- * The function below will fetch the image from the webservice and store it in the cache.
- *
- * @param ConfigManager $conf Configuration Manager instance,
- */
-function genThumbnail($conf)
-{
-    // Make sure the parameters in the URL were generated by us.
-    $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
-    if ($sign!=$_GET['hmac']) die('Naughty boy!');
-
-    $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
-    // Let's see if we don't already have the image for this URL in the cache.
-    $thumbname=hash('sha1',$_GET['url']).'.jpg';
-    if (is_file($cacheDir .'/'. $thumbname))
-    {   // We have the thumbnail, just serve it:
-        header('Content-Type: image/jpeg');
-        echo file_get_contents($cacheDir .'/'. $thumbname);
-        return;
-    }
-    // We may also serve a blank image (if service did not respond)
-    $blankname=hash('sha1',$_GET['url']).'.gif';
-    if (is_file($cacheDir .'/'. $blankname))
-    {
-        header('Content-Type: image/gif');
-        echo file_get_contents($cacheDir .'/'. $blankname);
-        return;
-    }
-
-    // Otherwise, generate the thumbnail.
-    $url = $_GET['url'];
-    $domain = parse_url($url,PHP_URL_HOST);
-
-    if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
-    {
-        // Crude replacement to handle new flickr domain policy (They prefer www. now)
-        $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
-
-        // Is this a link to an image, or to a flickr page ?
-        $imageurl='';
-        if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
-        {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
-            preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
-            if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
-        }
-        else // This is a flickr page (html)
-        {
-            // Get the flickr html page.
-            list($headers, $content) = get_http_response($url, 20);
-            if (strpos($headers[0], '200 OK') !== false)
-            {
-                // flickr now nicely provides the URL of the thumbnail in each flickr page.
-                preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
-                if (!empty($matches[1])) $imageurl=$matches[1];
-
-                // In albums (and some other pages), the link rel="image_src" is not provided,
-                // but flickr provides:
-                // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
-                if ($imageurl=='')
-                {
-                    preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
-                    if (!empty($matches[1])) $imageurl=$matches[1];
-                }
-            }
-        }
-
-        if ($imageurl!='')
-        {   // Let's download the image.
-            // Image is 240x120, so 10 seconds to download should be enough.
-            list($headers, $content) = get_http_response($imageurl, 10);
-            if (strpos($headers[0], '200 OK') !== false) {
-                // Save image to cache.
-                file_put_contents($cacheDir .'/'. $thumbname, $content);
-                header('Content-Type: image/jpeg');
-                echo $content;
-                return;
-            }
-        }
-    }
-
-    elseif ($domain=='vimeo.com' )
-    {
-        // This is more complex: we have to perform a HTTP request, then parse the result.
-        // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
-        $vid = substr(parse_url($url,PHP_URL_PATH),1);
-        list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
-        if (strpos($headers[0], '200 OK') !== false) {
-            $t = unserialize($content);
-            $imageurl = $t[0]['thumbnail_medium'];
-            // Then we download the image and serve it to our client.
-            list($headers, $content) = get_http_response($imageurl, 10);
-            if (strpos($headers[0], '200 OK') !== false) {
-                // Save image to cache.
-                file_put_contents($cacheDir .'/'. $thumbname, $content);
-                header('Content-Type: image/jpeg');
-                echo $content;
-                return;
-            }
-        }
-    }
-
-    elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
-    {
-        // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
-        // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
-        // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
-        list($headers, $content) = get_http_response($url, 5);
-        if (strpos($headers[0], '200 OK') !== false) {
-            // Extract the link to the thumbnail
-            preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
-            if (!empty($matches[1]))
-            {   // Let's download the image.
-                $imageurl=$matches[1];
-                // No control on image size, so wait long enough
-                list($headers, $content) = get_http_response($imageurl, 20);
-                if (strpos($headers[0], '200 OK') !== false) {
-                    $filepath = $cacheDir .'/'. $thumbname;
-                    file_put_contents($filepath, $content); // Save image to cache.
-                    if (resizeImage($filepath))
-                    {
-                        header('Content-Type: image/jpeg');
-                        echo file_get_contents($filepath);
-                        return;
-                    }
-                }
-            }
-        }
-    }
-
-    elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
-    {
-        // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
-        // http://xkcd.com/327/
-        // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
-        list($headers, $content) = get_http_response($url, 5);
-        if (strpos($headers[0], '200 OK') !== false) {
-            // Extract the link to the thumbnail
-            preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
-            if (!empty($matches[1]))
-            {   // Let's download the image.
-                $imageurl=$matches[1];
-                // No control on image size, so wait long enough
-                list($headers, $content) = get_http_response($imageurl, 20);
-                if (strpos($headers[0], '200 OK') !== false) {
-                    $filepath = $cacheDir.'/'.$thumbname;
-                    // Save image to cache.
-                    file_put_contents($filepath, $content);
-                    if (resizeImage($filepath))
-                    {
-                        header('Content-Type: image/jpeg');
-                        echo file_get_contents($filepath);
-                        return;
-                    }
-                }
-            }
-        }
-    }
-
-    else
-    {
-        // For all other domains, we try to download the image and make a thumbnail.
-        // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
-        list($headers, $content) = get_http_response($url, 30);
-        if (strpos($headers[0], '200 OK') !== false) {
-            $filepath = $cacheDir .'/'.$thumbname;
-            // Save image to cache.
-            file_put_contents($filepath, $content);
-            if (resizeImage($filepath))
-            {
-                header('Content-Type: image/jpeg');
-                echo file_get_contents($filepath);
-                return;
-            }
-        }
-    }
-
-
-    // Otherwise, return an empty image (8x8 transparent gif)
-    $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
-    // Also put something in cache so that this URL is not requested twice.
-    file_put_contents($cacheDir .'/'. $blankname, $blankgif);
-    header('Content-Type: image/gif');
-    echo $blankgif;
-}
-
-// Make a thumbnail of the image (to width: 120 pixels)
-// Returns true if success, false otherwise.
-function resizeImage($filepath)
-{
-    if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
-
-    // Trick: some stupid people rename GIF as JPEG... or else.
-    // So we really try to open each image type whatever the extension is.
-    $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
-    $im=false;
-    $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
-    $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
-    $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
-    if (!$im) return false;  // Unable to open image (corrupted or not an image)
-    $w = imagesx($im);
-    $h = imagesy($im);
-    $ystart = 0; $yheight=$h;
-    if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
-    $nw = 120;   // Desired width
-    $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
-    // Resize image:
-    $im2 = imagecreatetruecolor($nw,$nh);
-    imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
-    imageinterlace($im2,true); // For progressive JPEG.
-    $tempname=$filepath.'_TEMP.jpg';
-    imagejpeg($im2, $tempname, 90);
-    imagedestroy($im);
-    imagedestroy($im2);
-    unlink($filepath);
-    rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
-    return true;
+if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) {
+    showDailyRSS($conf, $loginManager);
+    exit;
 }
 
-if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
-if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
 }
 
 try {
     $history = new History($conf->get('resource.history'));
-} catch(Exception $e) {
+} catch (Exception $e) {
     die($e->getMessage());
 }
 
@@ -2169,7 +1889,7 @@ $container['history'] = $history;
 $app = new \Slim\App($container);
 
 // REST API routes
-$app->group('/api/v1', function() {
+$app->group('/api/v1', function () {
     $this->get('/info', '\Shaarli\Api\Controllers\Info:getInfo')->setName('getInfo');
     $this->get('/links', '\Shaarli\Api\Controllers\Links:getLinks')->setName('getLinks');
     $this->get('/links/{id:[\d]+}', '\Shaarli\Api\Controllers\Links:getLink')->setName('getLink');
@@ -2186,6 +1906,7 @@ $app->group('/api/v1', function() {
 })->add('\Shaarli\Api\ApiMiddleware');
 
 $response = $app->run(true);
+
 // Hack to make Slim and Shaarli router work together:
 // If a Slim route isn't found and NOT API call, we call renderPage().
 if ($response->getStatusCode() == 404 && strpos($_SERVER['REQUEST_URI'], '/api/v1') === false) {
@@ -2193,5 +1914,12 @@ if ($response->getStatusCode() == 404 && strpos($_SERVER['REQUEST_URI'], '/api/v
     header('Content-Type: text/html; charset=utf-8');
     renderPage($conf, $pluginManager, $linkDb, $history, $sessionManager, $loginManager);
 } else {
+    $response = $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');
     $app->respond($response);
 }