/**
  * Get download url.
  *
  * @param Google_Service_Drive_DriveFile $file
  *
  * @return string|false
  */
 protected function _gd_getDownloadUrl($file)
 {
     if (strpos($file->mimeType, 'application/vnd.google-apps') !== 0) {
         return 'https://www.googleapis.com/drive/v3/files/' . $file->getId() . '?alt=media';
     } else {
         $mimeMap = $this->options['appsExportMap'];
         if (isset($mimeMap[$file->getMimeType()])) {
             $mime = $mimeMap[$file->getMimeType()];
         } else {
             $mime = $mimeMap['default'];
         }
         $mime = rawurlencode($mime);
         return 'https://www.googleapis.com/drive/v3/files/' . $file->getId() . '/export?mimeType=' . $mime;
     }
     return false;
 }