public function getRule(EventInterface $event) {
        $acl = $event->getAccessControl();

        $request = $event->getRequest();
        $publicKey = $request->getRoute()->get('publickey');
        $accessRuleId = $request->getRoute()->get('accessRuleId');

        $keyExists = $acl->publicKeyExists($publicKey);

        if (!$keyExists) {
            throw new RuntimeException('Public key not found', 404);
        }

        $accessRule = $acl->getAccessRule($publicKey, $accessRuleId);

        if (!$accessRule) {
            throw new RuntimeException('Access rule not found', 404);
        }

        $model = new AccessRuleModel();
        $model->setId($accessRule['id'])
              ->setUsers($accessRule['users']);

        if (isset($accessRule['group'])) {
            $model->setGroup($accessRule['group']);
        }

        if (isset($accessRule['resources'])) {
            $model->setResources($accessRule['resources']);
        }

        $event->getResponse()->setModel($model);
    }