ActionLinkController.php in Flag Lists 8

Namespace

Drupal\flag_lists\Controller

File

src/Controller/ActionLinkController.php

<?php

namespace Drupal\flag_lists\Controller;

use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\ReplaceCommand;
use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Render\RendererInterface;
use Drupal\Core\Url;
use Drupal\Core\Render\BubbleableMetadata;
use Drupal\Component\Utility\UrlHelper;
use Drupal\flag\Ajax\ActionLinkFlashCommand;
use Drupal\flag\FlagInterface;
use Drupal\flag\FlagServiceInterface;
use Drupal\flag_lists\FlagListsServiceInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Component\Utility\Html;

/**
 * Controller responses to flag and unflag action links.
 *
 * The response is a set of AJAX commands to update the
 * link in the page.
 */
class ActionLinkController implements ContainerInjectionInterface {

  /**
   * The flag service.
   *
   * @var \Drupal\flag\FlagServiceInterface
   */
  protected $flagService;

  /**
   * The flag lists service.
   *
   * @var \Drupal\flag\FlagListsServiceInterface
   */
  protected $flagListsService;

  /**
   * The renderer service.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * Constructor.
   *
   * @param \Drupal\flag\FlagServiceInterface $flag
   *   The flag service.
   * @param \Drupal\flag_lists\FlagListsServiceInterface $flag_lists
   *   The flag lists service.
   * @param \Drupal\Core\Render\RendererInterface $renderer
   *   The Renderer service.
   */
  public function __construct(FlagServiceInterface $flag, FlagListsServiceInterface $flag_lists, RendererInterface $renderer) {
    $this->flagService = $flag;
    $this->flagListsService = $flag_lists;
    $this->renderer = $renderer;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container
      ->get('flag'), $container
      ->get('flaglists'), $container
      ->get('renderer'));
  }

  /**
   * Performs a flagging when called via a route.
   *
   * In addition to this it also handles the creation of a FlagListItem.
   *
   * @param \Drupal\flag\FlagInterface $flag
   *   The flag entity.
   * @param int $entity_id
   *   The flaggable entity ID.
   * @param string $flag_list
   *   The flag list from the link.
   *
   * @return \Drupal\Core\Ajax\AjaxResponse|null
   *   The response object, only if successful.
   *
   * @see \Drupal\flag\Plugin\Reload
   * @see \Drupal\flag_lists\Entity\FlagListItem
   */
  public function flag(FlagInterface $flag, $entity_id, $flag_list) {

    /* @var \Drupal\Core\Entity\EntityInterface $entity */
    $entity = $this->flagService
      ->getFlaggableById($flag, $entity_id);
    try {
      $this->flagService
        ->flag($flag, $entity);
    } catch (\LogicException $e) {

      // Fail silently so we return to the entity, which will show an updated
      // link for the existing state of the flag.
    }

    // Create the flag list item.
    $actionLinkHelper = new ActionLinkHelper($this->flagListsService);
    $actionLinkHelper
      ->flagHelper($flag, $entity_id, $flag_list);
    return $this
      ->generateResponse($flag, $entity, $flag_list, $flag
      ->getMessage('flag'));
  }

  /**
   * Performs a unflagging when called via a route.
   *
   * In addition to this it also handles the deletion of the
   * related FlagListItem's.
   *
   * @param \Drupal\flag\FlagInterface $flag
   *   The flag entity.
   * @param int $entity_id
   *   The flaggable entity ID.
   * @param string $flag_list
   *   The flag list from the link.
   *
   * @return \Drupal\Core\Ajax\AjaxResponse|\Symfony\Component\HttpFoundation\RedirectResponse|null
   *   The response object, only if successful.
   *
   * @see \Drupal\flag\Plugin\Reload
   * @see \Drupal\flag_lists\Entity\FlagListItem
   */
  public function unflag(FlagInterface $flag, $entity_id, $flag_list) {

    /* @var \Drupal\Core\Entity\EntityInterface $entity */
    $entity = $this->flagService
      ->getFlaggableById($flag, $entity_id);
    try {
      $this->flagService
        ->unflag($flag, $entity);
    } catch (\LogicException $e) {

      // Fail silently so we return to the entity, which will show an updated
      // link for the existing state of the flag.
    }

    // Remove the flag list item.
    $actionLinkHelper = new ActionLinkHelper($this->flagListsService);
    $actionLinkHelper
      ->unflagHelper($flag, $entity_id, $flag_list);
    return $this
      ->generateResponse($flag, $entity, $flag_list, $flag
      ->getMessage('unflag'));
  }

  /**
   * Generates a response after the flag has been updated.
   *
   * The response is different from the Flag modules
   * response as we add the flagging collection Id as well.
   *
   * @param \Drupal\flag\FlagInterface $flag
   *   The flag entity.
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   The entity object.
   * @param string $flag_list
   *   The flag list from the link.
   * @param string $message
   *   (optional) The message to flash.
   *
   * @return \Drupal\Core\Ajax\AjaxResponse|\Symfony\Component\HttpFoundation\RedirectResponse
   *   The response object.
   *
   * @see \Drupal\flag_lists\Entity\FlaggingCollection
   */
  private function generateResponse(FlagInterface $flag, EntityInterface $entity, $flag_list, $message) {

    // Create a new AJAX response.
    $response = new AjaxResponse();

    // Get the link type plugin.
    $link_type = $flag
      ->getLinkTypePlugin();

    // Generate the link render array.
    $link = $link_type
      ->getAsFlagLink($flag, $entity);
    $flc = $this->flagListsService
      ->getFlaggingCollectionById($flag_list);
    $token_service = \Drupal::token();
    $bubbleable_metadata = new BubbleableMetadata();
    $link['#title']['#markup'] = $token_service
      ->replace($link['#title']['#markup'], [
      'flagging_collection' => $flc,
    ], [], $bubbleable_metadata);
    $bubbleable_metadata
      ->applyTo($link);
    $link['#flagging_collection'] = $flag_list;

    // Add the flag_list to the link
    // This is a messy method where everything is made by hand...
    $options = UrlHelper::parse($link['#attributes']['href']);
    $uri = 'internal:' . $options['path'] . '/' . $flag_list;
    $path = ltrim($options['path'] . '/' . $flag_list, '/');

    // Create a token.
    $generator = \Drupal::csrfToken();
    $token = $generator
      ->get($path);
    unset($options['path']);
    $options['query']['token'] = $token;

    // Update the href.
    $link['#attributes']['href'] = Url::fromUri($uri, $options)
      ->toString();

    // Generate a CSS selector to use in a JQuery Replace command.
    $selector = '.js-flag-' . Html::cleanCssIdentifier($flag
      ->id()) . '-' . $entity
      ->id() . '-' . $flag_list;

    // Create a new JQuery Replace command to update the link display.
    $replace = new ReplaceCommand($selector, $this->renderer
      ->renderPlain($link));
    $response
      ->addCommand($replace);

    // Push a message pulsing command onto the stack.
    $pulse = new ActionLinkFlashCommand($selector, $message);
    $response
      ->addCommand($pulse);
    return $response;
  }

}

Classes

Name	Description
ActionLinkController	Controller responses to flag and unflag action links.