class GotoAction

class GotoAction extends ConfigurableActionBase implements ContainerFactoryPluginInterface {
    
    /**
     * The event dispatcher service.
     *
     * @var \Symfony\Contracts\EventDispatcher\EventDispatcherInterface
     */
    protected $dispatcher;
    
    /**
     * The unrouted URL assembler service.
     *
     * @var \Drupal\Core\Utility\UnroutedUrlAssemblerInterface
     */
    protected $unroutedUrlAssembler;
    
    /**
     * Constructs a GotoAction object.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin ID for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Symfony\Contracts\EventDispatcher\EventDispatcherInterface $dispatcher
     *   The tempstore factory.
     * @param \Drupal\Core\Utility\UnroutedUrlAssemblerInterface $url_assembler
     *   The unrouted URL assembler service.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, EventDispatcherInterface $dispatcher, UnroutedUrlAssemblerInterface $url_assembler) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->dispatcher = $dispatcher;
        $this->unroutedUrlAssembler = $url_assembler;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('event_dispatcher'), $container->get('unrouted_url_assembler'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function execute($object = NULL) {
        $url = $this->configuration['url'];
        // Leave external URLs unchanged, and assemble others as absolute URLs
        // relative to the site's base URL.
        if (!UrlHelper::isExternal($url)) {
            $parts = UrlHelper::parse($url);
            // @todo '<front>' is valid input for BC reasons, may be removed by
            //   https://www.drupal.org/node/2421941
            if ($parts['path'] === '<front>') {
                $parts['path'] = '';
            }
            $uri = 'base:' . $parts['path'];
            $options = [
                'query' => $parts['query'],
                'fragment' => $parts['fragment'],
                'absolute' => TRUE,
            ];
            // Treat this as if it's user input of a path relative to the site's
            // base URL.
            $url = $this->unroutedUrlAssembler
                ->assemble($uri, $options);
        }
        $response = new RedirectResponse($url);
        $listener = function ($event) use ($response) {
            $event->setResponse($response);
        };
        // Add the listener to the event dispatcher.
        $this->dispatcher
            ->addListener(KernelEvents::RESPONSE, $listener);
    }
    
    /**
     * {@inheritdoc}
     */
    public function defaultConfiguration() {
        return [
            'url' => '',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
        $form['url'] = [
            '#type' => 'textfield',
            '#title' => $this->t('URL'),
            '#description' => $this->t('The URL to which the user should be redirected. This can be an internal URL like /node/1234 or an external URL like @url.', [
                '@url' => 'http://example.com',
            ]),
            '#default_value' => $this->configuration['url'],
            '#required' => TRUE,
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
        $this->configuration['url'] = $form_state->getValue('url');
    }
    
    /**
     * {@inheritdoc}
     */
    public function access($object, AccountInterface $account = NULL, $return_as_object = FALSE) {
        $access = AccessResult::allowed();
        return $return_as_object ? $access : $access->isAllowed();
    }

}