if (!in_array(strtolower($object_type), array('album', 'artist', 'playlist', 'podcast', 'podcast_episode', 'song', 'video'))) {
            /* HINT: Requested object string/id/type ("album", "myusername", "some song title", 1298376) */
            Api::error(sprintf('Bad Request: %s', $object_type), ErrorCodeEnum::BAD_REQUEST, self::ACTION, 'type', $input['api_format']);

            return false;