public function action_sendfile()
 {
     $file = $this->request->param('file');
     $format = $this->request->param('format');
     $file = preg_replace('/\\-[0-9a-f]{1,32}$/', '', $file);
     $file_name = Assets::get_file($file, $format);
     if ($file_name && is_file($file_name)) {
         $this->response->send_file($file_name, NULL, ['inline' => true]);
     } else {
         throw new HTTP_Exception_404();
     }
 }
 public static function video_tag($source, array $attributes = NULL)
 {
     if (strpos('//', $source) === FALSE && isset($source[0]) && $source[0] !== '/') {
         $version = '';
         $format = 'mp4';
         if (preg_match('#^(?<source>.+)\\.(?<format>\\w+)$#', $source, $matches)) {
             $source = $matches['source'];
             $format = $matches['format'];
         }
         if (Kohana::$config->load('assets.versionizable') === TRUE) {
             $file_name = Assets::get_file($source, $format);
             if ($file_name && is_file($file_name)) {
                 $version = '-' . hash_hmac_file('md5', $file_name, Kohana::$config->load('assets.versionizable.hmac_password'));
             }
         }
         $source = '/assets/' . $source . $version . '.' . $format;
         $mime = File::mime_by_ext($format);
     } else {
         $mime = File::mime($source);
     }
     return '<video' . HTML::attributes($attributes) . '><source src="' . $source . '" type="' . $mime . '" /><a href="' . $source . '">' . $source . '</a></video>';
 }