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 <?php
 ###########################################################################
 ##  Copyright (C) Wizardry and Steamworks 2017 - License: GNU GPLv3      ##
 ###########################################################################
 require_once('php/pseudocrypt.php');
 require_once('php/functions.php');
 require_once('vendor/autoload.php');
 ### FFMpeg
 require_once('vendor/php-ffmpeg/php-ffmpeg/src/FFMpeg/FFMpeg.php');
 ### Aura URI
 require_once('vendor/aura/uri/src/Aura/Uri/PublicSuffixList.php');
 require_once('vendor/aura/uri/src/Aura/Uri/Url/Factory.php');
 require_once('vendor/aura/uri/src/Aura/Uri/Query.php');
 require_once('vendor/aura/uri/src/Aura/Uri/Host.php');
 require_once('vendor/aura/uri/src/Aura/Uri/Url.php');
 require_once('vendor/aura/uri/src/Aura/Uri/Path.php');
 use Aura\Uri\Url\Factory as UrlFactory;
 use Aura\Uri\PublicSuffixList;
 ### Load configuration.
 $config = spyc_load_file('config.yaml');
 ### If no file has been specified for download then return.
 if (!isset($_GET['hash']) or empty($_GET['hash'])) {
     http_response_code(404);
     die('File not found.');
+}
 ### Find the requested file.
 $file = array_shift(
     preg_grep(
         "/".$_GET['hash']."/",
         scandir($config['STORE_FOLDER'])
+    )
 );
 if (!isset($file) or empty($file)) {
     http_response_code(404);
     die('File not found.');
+}
 ### Check the path for path traversals.
 $fileExtension = pathinfo($file, PATHINFO_EXTENSION);
 #### If the extension is not allowed then return.
 if (!isset($fileExtension) ||
     !in_array(strtoupper($fileExtension),
         array_map('strtoupper', $config['ALLOWED_FILE_EXTENSIONS']))) {
     http_response_code(403);
     die('File extension not allowed.');
+}
 #### Build the user path.
 $userPath = join(
     DIRECTORY_SEPARATOR,
     array(
         $config['STORE_FOLDER'],
         $file
+    )
 );
 #### Check for path traversals
 $pathPart = pathinfo($userPath);
 if (strcasecmp(
     realpath($pathPart['dirname']), realpath($config['STORE_FOLDER'])) != 0) {
     http_response_code(500);
     die('Internal server error.');
+}
 #### Check if the file exists.
 if (!file_exists($userPath)) {
     http_response_code(404);
     die('File not found.');
+}
 ### Extract the server path.
 $URLFactory = new UrlFactory(
     $_SERVER,
     new PublicSuffixList(require 'vendor/aura/uri/data/public-suffix-list.php')
 );
 $URL = $URLFactory->newCurrent();
 ### HTTPs has to be enforced for opengraph sharing.
 if(strtoupper($URL->scheme) != 'HTTPS')
     $URL->setScheme('https');
 $URL_PATH = array_shift(
     explode(
         'og/'.$_GET['hash'],
         $URL->getFull()
+    )
 );
 $GRAPH_URL = $URL_PATH.'og/'.$_GET['hash'];
 $CANON_URL = $URL_PATH.'file.php?hash='.$_GET['hash'];
 $BASIC_URL = $URL_PATH.$_GET['hash'];
 switch(strtoupper($fileExtension)) {
     case 'GIF':
         list($width, $height) = getimagesize($userPath);
         echo <<<END
 <html>
   <head>
+    <meta property="fb:app_id" content="144991146129146">
     <meta property="og:site_name" content="Scratch Copy">
+    <meta property="og:description" content="Scratch Copy">
     <meta property="og:url" content="$BASIC_URL">
     <meta property="og:title" content="Scratch Copy">
     <meta property="og:type" content="video.other">
     <meta property="og:image" content="$BASIC_URL">
     <meta property="og:image:width" content="$width">
     <meta property="og:image:height" content="$height">
   </head>
   <body>
     <p>
       <img src="$BASIC_URL">
     </p>
   </body>
 </html>
 END;
     break;
     case 'MP4':
     ### Create a thumbnail for the video.
     $file = strtolower(
         PseudoCrypt::hash(
             preg_replace(
                 '/\D/',
                 '',
                 hash(
                     'sha512',
                     $_GET['hash']
+                )
             ),
             $config['ASSET_HASH_SIZE']
+        )
     );
     #### Build the user path.
     $userPath = join(
         DIRECTORY_SEPARATOR,
         array(
             $config['STORE_FOLDER'],
             $file
+        )
     );
     ### Do not re-create the thumbnail if it already exists.
     if(!file_exists($userPath.'.'.'jpg')) {
         ### Extract thumbnail.
         $ffmpeg = FFMpeg\FFMpeg::create();
         $video = $ffmpeg->open($CANON_URL);
         $frame = $video->frame(
             FFMpeg\Coordinate\TimeCode::fromSeconds(
                 $config['VIDEO_PREVIEW_IMAGE_FRAME_SECOND']
+            )
         );
         $frame->save($userPath.'.'.'jpg');
+    }
     ### Get preview image size.
     list($imageWidth, $imageHeight) = getimagesize($userPath.'.'.'jpg');
     ### Probe video for width and height.
     $ffprobe = FFMpeg\FFProbe::create();
     $dimension = $ffprobe
         ->streams($CANON_URL)
         ->videos()
         ->first()
         ->getDimensions();
+    $videoDuration = round(
+        $ffprobe
+            ->streams($CANON_URL)
+            ->videos()
+            ->first()
+            ->get('duration'),
+,
+        PHP_ROUND_HALF_UP
+    );
     $videoWidth = $dimension->getWidth();
     $videoHeight = $dimension->getHeight();
     ### Build paths.
     $PREVIEW_IMAGE_URL = $URL_PATH.$file;
     $FLOW_PLAYER_VIDEO_URL = $URL_PATH.'flowplayer/flowplayer.swf?config={"clip":"'.$BASIC_URL.'"}';
     $FLOW_PLAYER = $URL_PATH.'flowplayer/flowplayer.swf';
     echo <<<END
 <html>
   <head>
+      <meta property="fb:app_id" content="144991146129146">
       <meta property="og:type" content="video.other">
       <meta property="og:title" content="Scratch Copy">
       <meta property="og:site_name" content="Scratch Copy">
+      <meta property="og:description" content="Scratch Copy">
       <meta property="og:url" content="$GRAPH_URL">
       <meta property="og:image" content="$PREVIEW_IMAGE_URL">
       <meta property="og:video" content='$FLOW_PLAYER_VIDEO_URL'>
       <meta property="og:video:secure_url" content='$FLOW_PLAYER_VIDEO_URL'>
       <meta property="og:video:type" content="application/x-shockwave-flash">
+      <meta property="video:duration" content="$videoDuration">
       <meta property="og:video:width" content="$videoWidth">
       <meta property="og:video:height" content="$videoHeight">
       <meta property="og:image:width" content="$imageWidth">
       <meta property="og:image:height" content="$imageHeight">
   </head>
   <body>
     <p>
       <object width="$videoWidth" height="$videoHeight" id="Scratch Copy" name="Scratch Copy" data="$FLOW_PLAYER" type="application/x-shockwave-flash"><param name="movie" value="$FLOW_PLAYER" /><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="flashvars" value='config={"clip":"$BASIC_URL"}' /></object>
     </p>
   </body>
 </html>
 END;
     break;
+}