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 shaarli#345 shaarli#425 shaarli#487 shaarli#543 shaarli#588 shaarli#590

application/PageBuilder.php

@@ -99,6 +99,11 @@ private function initialize()
         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);
     }

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);
+    }
+}

application/config/ConfigManager.php

@@ -319,6 +319,10 @@ protected function setDefaultValues()
         $this->setEmpty('general.enabled_plugins', self::$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);

composer.json

@@ -11,14 +11,15 @@
     "keywords": ["bookmark", "link", "share", "web"],
     "config": {
         "platform": {
-            "php": "5.5.38"
+            "php": "5.6.32"
         }
     },
     "require": {
-        "php": ">=5.5",
+        "php": ">=5.6",
         "shaarli/netscape-bookmark-parser": "^2.0",
         "erusev/parsedown": "1.6",
         "slim/slim": "^3.0",
+        "arthurhoaro/web-thumbnailer": "dev-master",
         "pubsubhubbub/publisher": "dev-master",
         "gettext/gettext": "^4.4"
     },

inc/web-thumbnailer.json

@@ -0,0 +1,9 @@
+{
+  "settings": {
+    "default": {
+      "_comment": "infinite cache",
+      "cache_duration": -1,
+      "timeout": 60
+    }
+  }
+}