Use web-thumbnailer to retrieve thumbnails

  * requires PHP 5.6
  * use blazy on linklist since a lot more thumbs are retrieved
  * thumbnails can be disabled
  * thumbs size is now 120x120
  * thumbs are now cropped to fit the expected size

Fixes #345 #425 #487 #543 #588 #590

3 files changed, 58 insertions, 0 deletions

diff --git a/application/PageBuilder.php b/application/PageBuilder.php
index a4483870..3dba7677 100644
--- a/application/PageBuilder.php
+++ b/application/PageBuilder.php
@@ -105,6 +105,11 @@ class PageBuilder
         if ($this->linkDB !== null) {
             $this->tpl->assign('tags', $this->linkDB->linksCountPerTag());
         }
+
+        $this->tpl->assign('thumbnails_enabled', $this->conf->get('thumbnails.enabled'));
+        $this->tpl->assign('thumbnails_width', $this->conf->get('thumbnails.width'));
+        $this->tpl->assign('thumbnails_height', $this->conf->get('thumbnails.height'));
+
         // To be removed with a proper theme configuration.
         $this->tpl->assign('conf', $this->conf);
     }
diff --git a/application/Thumbnailer.php b/application/Thumbnailer.php
new file mode 100644
index 00000000..b669adae
--- /dev/null
+++ b/application/Thumbnailer.php
@@ -0,0 +1,49 @@
+<?php
+
+use WebThumbnailer\WebThumbnailer;
+
+/**
+ * Class Thumbnailer
+ *
+ * Utility class used to retrieve thumbnails using web-thumbnailer dependency.
+ */
+class Thumbnailer
+{
+    /**
+     * @var WebThumbnailer instance.
+     */
+    protected $wt;
+
+    /**
+     * @var ConfigManager instance.
+     */
+    protected $conf;
+
+    /**
+     * Thumbnailer constructor.
+     *
+     * @param ConfigManager $conf instance.
+     */
+    public function __construct($conf)
+    {
+        $this->conf = $conf;
+        $this->wt = new WebThumbnailer();
+        \WebThumbnailer\Application\ConfigManager::addFile('inc/web-thumbnailer.json');
+        $this->wt->maxWidth($this->conf->get('thumbnails.width'))
+                 ->maxHeight($this->conf->get('thumbnails.height'))
+                 ->crop(true)
+                 ->debug($this->conf->get('dev.debug', false));
+    }
+
+    /**
+     * Retrieve a thumbnail for given URL
+     *
+     * @param string $url where to look for a thumbnail.
+     *
+     * @return bool|string The thumbnail relative cache file path, or false if none has been found.
+     */
+    public function get($url)
+    {
+        return $this->wt->thumbnail($url);
+    }
+}
diff --git a/application/config/ConfigManager.php b/application/config/ConfigManager.php
index 82f4a368..124fedc2 100644
--- a/application/config/ConfigManager.php
+++ b/application/config/ConfigManager.php
@@ -319,6 +319,10 @@ class ConfigManager
         $this->setEmpty('general.enabled_plugins', self::$DEFAULT_PLUGINS);
         $this->setEmpty('general.default_note_title', 'Note: ');
 
+        $this->setEmpty('thumbnails.enabled', true);
+        $this->setEmpty('thumbnails.width', 120);
+        $this->setEmpty('thumbnails.height', 120);
+
         $this->setEmpty('updates.check_updates', false);
         $this->setEmpty('updates.check_updates_branch', 'stable');
         $this->setEmpty('updates.check_updates_interval', 86400);