From 8879590cb5fd26fbcb0f9e883d29dfb22efa28ad Mon Sep 17 00:00:00 2001
From: n <n@tourmentine.com>
Date: Sun, 27 Dec 2015 22:40:58 +0100
Subject: [PATCH] open graph support for shaarli

---
 shaarli_oleg.patch | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 shaarli_oleg.patch

diff --git a/shaarli_oleg.patch b/shaarli_oleg.patch
new file mode 100644
index 0000000..3fd1aa3
--- /dev/null
+++ b/shaarli_oleg.patch
@@ -0,0 +1,63 @@
+diff --git index.php index.php
+index 40a6fbe..2e1117a 100644
+--- index.php
++++ index.php
+@@ -2087,10 +2087,14 @@ function computeThumbnail($url,$href=false)
+             $path = parse_url($url,PHP_URL_PATH);
+             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
+         }
++    }
+         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
++        $thumbname=hash('sha1',$url).'.gif';
++        $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
++        if (sha1_file($filepath) != '48d45d7ada69f9f858849bbd6e459f66c9694ee7')
++
+         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
+                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
+-    }
+ 
+     // 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.
+@@ -2400,18 +2404,30 @@ function genThumbnail()
+     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, $data) = get_http_url($url, 30);
+-        if (strpos($headers[0], '200 OK') !== false) {
+-            $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
+-            file_put_contents($filepath,$data); // Save image to cache.
+-            if (resizeImage($filepath))
+-            {
+-                header('Content-Type: image/jpeg');
+-                echo file_get_contents($filepath);
+-                return;
+-            }
+-        }
++        list($httpstatus,$headers,$data) = get_http_url($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
++        // Extract the link to the thumbnail
++        $doc = new DOMDocument();
++        libxml_use_internal_errors(true);
++        $doc->loadHTML($data);
++        foreach( $doc->getElementsByTagName('meta') as $meta )
++                if ($meta->getAttribute('property') == 'og:image')
++                    $imageurl=$meta->getAttribute('content');
++        if (!empty($imageurl))
++        {   // Let's download the image.
++                list($httpstatus,$headers,$data) = get_http_url($imageurl,20); // No control on image size, so wait long enough.
++                if (strpos($httpstatus,'200 OK')!==false)
++                {
++                    $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
++                    file_put_contents($filepath,$data); // Save image to cache.
++                    if (resizeImage($filepath))
++                    {
++                        header('Content-Type: image/jpeg');
++                        echo file_get_contents($filepath);
++                        return;
++                    }
++                }
++         }
++
+     }
+ 
+