final public static function getReadOnlyResources() {
        return [
            self::USER_GET,
            self::USER_HEAD,
            self::USER_OPTIONS,

            self::IMAGE_GET,
            self::IMAGE_HEAD,
            self::IMAGE_OPTIONS,

            self::IMAGES_GET,
            self::IMAGES_HEAD,
            self::IMAGES_OPTIONS,

            self::METADATA_GET,
            self::METADATA_HEAD,
            self::METADATA_OPTIONS,

            self::SHORTURL_GET,
            self::SHORTURL_HEAD,
            self::SHORTURL_OPTIONS,

            self::GLOBAL_IMAGES_GET,
            self::GLOBAL_IMAGES_HEAD,
            self::GLOBAL_IMAGES_OPTIONS,

            self::SHORTURLS_OPTIONS,
        ];
    }