getParameterBagValue example

public function onAuthenticationFailure(Request $request, AuthenticationException $exception): Response
    {
        return $this->failureHandler->onAuthenticationFailure($request, $exception);
    }

    private function getCredentials(Request $request): array
    {
        $credentials = [];
        $credentials['csrf_token'] = ParameterBagUtils::getRequestParameterValue($request, $this->options['csrf_parameter']);

        if ($this->options['post_only']) {
            $credentials['username'] = ParameterBagUtils::getParameterBagValue($request->request, $this->options['username_parameter']);
            $credentials['password'] = ParameterBagUtils::getParameterBagValue($request->request, $this->options['password_parameter']) ?? '';
        } else {
            $credentials['username'] = ParameterBagUtils::getRequestParameterValue($request, $this->options['username_parameter']);
            $credentials['password'] = ParameterBagUtils::getRequestParameterValue($request, $this->options['password_parameter']) ?? '';
        }

        if (!\is_string($credentials['username']) && !$credentials['username'] instanceof \Stringable) {
            throw new BadRequestHttpException(sprintf('The key "%s" must be a string, "%s" given.', $this->options['username_parameter'], \gettype($credentials['username'])));
        }

        $credentials['username'] = trim($credentials['username']);