AuthBucket\OAuth2\ResponseType\AbstractResponseTypeHandler::checkState PHP Метод

    protected function checkState(Request $request, $redirectUri)
    {
        // state is required and in valid format.
        $state = $request->query->get('state');
        $errors = $this->validator->validate($state, [new NotBlank(), new State()]);
        if (count($errors) > 0) {
            throw new InvalidRequestException(['redirect_uri' => $redirectUri, 'error_description' => 'The request includes an invalid parameter value']);
        }
        return $state;
    }