open graph support for shaarli (cleaning)

shaarli_OleG.0.8.3.patch

@@ -1,6 +1,6 @@
 --- Shaarli/index.php	2017-01-20 16:47:36.000000000 +0100
-+++ index.php	2017-02-11 18:29:08.779509000 +0100
-@@ -1821,11 +1821,16 @@
++++ /home/www/beta/Shaarli/index.php	2017-02-11 23:27:22.510042000 +0100
+@@ -1821,11 +1821,14 @@
              $path = parse_url($url,PHP_URL_PATH);
              if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
          }
@@ -9,8 +9,6 @@
 -        return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
 +        $thumbname=hash('sha1',$url).'.gif';
 +        $filepath = $conf->get('resource.thumbnails_cache').'/'.$thumbname;
-+	//echo sha1_file($filepath);
-+	//echo $filepath;
 +        if (sha1_file($filepath) != '48d45d7ada69f9f858849bbd6e459f66c9694ee7')
 +                return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
                       'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
@@ -20,7 +18,7 @@
      // 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.
-@@ -2154,19 +2159,33 @@
+@@ -2154,19 +2157,33 @@
      else
      {
          // For all other domains, we try to download the image and make a thumbnail.