class CookiesCacheContext

class CookiesCacheContext extends RequestStackCacheContextBase implements CalculatedCacheContextInterface {
    
    /**
     * {@inheritdoc}
     */
    public static function getLabel() {
        return t('HTTP cookies');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getContext($cookie = NULL) {
        if ($cookie === NULL) {
            $cookies = $this->requestStack
                ->getCurrentRequest()->cookies
                ->all();
            // Sort the cookies by names, to always set the same context if the cookies
            // are the same but in a different order.
            ksort($cookies);
            // Use http_build_query() to get a short string from the cookies array.
            return http_build_query($cookies);
        }
        else {
            return $this->requestStack
                ->getCurrentRequest()->cookies
                ->get($cookie);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheableMetadata($cookie = NULL) {
        return new CacheableMetadata();
    }

}