public function getRepositoryPermission($uri, $recipientUri)
    {
        $url = $this->service_url . '/permissions' . $uri;
        $url .= ";recipient=" . str_replace('/', '%2F', $recipientUri);
        $data = $this->service->prepAndSend($url, array(200), 'GET', null, true);
        return RepositoryPermission::createFromJSON($data);
    }