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

tests/ThumbnailerTest.php

@@ -0,0 +1,51 @@
+<?php
+
+require_once 'application/Thumbnailer.php';
+require_once 'application/config/ConfigManager.php';
+
+/**
+ * Class ThumbnailerTest
+ *
+ * We only make 1 thumb test because:
+ *
+ *   1. the thumbnailer library is itself tested
+ *   2. we don't want to make too many external requests during the tests
+ */
+class ThumbnailerTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * Test a thumbnail with a custom size.
+     */
+    public function testThumbnailValid()
+    {
+        $conf = new ConfigManager('tests/utils/config/configJson');
+        $width = 200;
+        $height = 200;
+        $conf->set('thumbnails.width', $width);
+        $conf->set('thumbnails.height', $height);
+
+        $thumbnailer = new Thumbnailer($conf);
+        $thumb = $thumbnailer->get('https://github.com/shaarli/Shaarli/');
+        $this->assertNotFalse($thumb);
+        $image = imagecreatefromstring(file_get_contents($thumb));
+        $this->assertEquals($width, imagesx($image));
+        $this->assertEquals($height, imagesy($image));
+    }
+
+    /**
+     * Test a thumbnail that can't be retrieved.
+     *
+     * @expectedException WebThumbnailer\Exception\ThumbnailNotFoundException
+     */
+    public function testThumbnailNotValid()
+    {
+        $oldlog = ini_get('error_log');
+        ini_set('error_log', '/dev/null');
+
+        $thumbnailer = new Thumbnailer(new ConfigManager());
+        $thumb = $thumbnailer->get('nope');
+        $this->assertFalse($thumb);
+
+        ini_set('error_log', $oldlog);
+    }
+}

tests/utils/config/configJson.json.php

@@ -29,6 +29,9 @@
     },
     "plugins": {
         "WALLABAG_VERSION": 1
+    },
+    "dev": {
+        "debug": true
     }
 }
 */ ?>