class PostRenderSubscriber in Entity Print 8.2

The PostRenderSubscriber class.

Hierarchy

• class \Drupal\entity_print\EventSubscriber\PostRenderSubscriber implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

1 file declares its use of PostRenderSubscriber

PostRenderSubscriberTest.php in tests/src/Kernel/PostRenderSubscriberTest.php

1 string reference to 'PostRenderSubscriber'

entity_print.services.yml in ./entity_print.services.yml

entity_print.services.yml

1 service uses PostRenderSubscriber

entity_print.post_render_subscriber in ./entity_print.services.yml

Drupal\entity_print\EventSubscriber\PostRenderSubscriber

File

src/EventSubscriber/PostRenderSubscriber.php, line 15

Namespace

Drupal\entity_print\EventSubscriber

class PostRenderSubscriber implements EventSubscriberInterface {

  /**
   * The Config Factory.
   *
   * @var \Drupal\Core\Config\ConfigFactoryInterface
   */
  protected $configFactory;

  /**
   * The request stack.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected $requestStack;

  /**
   * PostRenderSubscriber constructor.
   *
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   The configuration factory.
   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
   *   The request stack.
   */
  public function __construct(ConfigFactoryInterface $config_factory, RequestStack $request_stack) {
    $this->configFactory = $config_factory;
    $this->requestStack = $request_stack;
  }

  /**
   * Alter the HTML after it has been rendered.
   *
   * @param \Drupal\entity_print\Event\PrintHtmlAlterEvent $event
   *   The event object.
   *
   *   This is a temporary workaround for a core issue.
   *
   * @see https://drupal.org/node/1494670
   */
  public function postRender(PrintHtmlAlterEvent $event) {

    // We only apply the fix to PHP Wkhtmltopdf because the other
    // implementations allow us to specify a base url.
    $config = $this->configFactory
      ->get('entity_print.settings');
    if ($config
      ->get('print_engines.pdf_engine') !== 'phpwkhtmltopdf') {
      return;
    }
    $html_string =& $event
      ->getHtml();
    $html5 = new HTML5();
    $document = $html5
      ->loadHTML($html_string);

    // Define a function that will convert root relative uris into absolute
    // urls.
    $transform = function ($tag, $attribute) use ($document) {
      $base_url = $this->requestStack
        ->getCurrentRequest()
        ->getSchemeAndHttpHost();
      foreach ($document
        ->getElementsByTagName($tag) as $node) {
        $attribute_value = $node
          ->getAttribute($attribute);

        // Handle protocol agnostic URLs as well.
        if (mb_substr($attribute_value, 0, 2) === '//') {
          $node
            ->setAttribute($attribute, $base_url . mb_substr($attribute_value, 1));
        }
        elseif (mb_substr($attribute_value, 0, 1) === '/') {
          $node
            ->setAttribute($attribute, $base_url . $attribute_value);
        }
      }
    };

    // Transform stylesheets, links and images.
    $transform('link', 'href');
    $transform('a', 'href');
    $transform('img', 'src');

    // Overwrite the HTML.
    $html_string = $html5
      ->saveHTML($document);
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    return [
      PrintEvents::POST_RENDER => 'postRender',
    ];
  }

}

Members

Name	Modifiers	Type	Description	Overrides
PostRenderSubscriber::$configFactory	protected	property	The Config Factory.
PostRenderSubscriber::$requestStack	protected	property	The request stack.
PostRenderSubscriber::getSubscribedEvents	public static	function	Returns an array of event names this subscriber wants to listen to.
PostRenderSubscriber::postRender	public	function	Alter the HTML after it has been rendered.
PostRenderSubscriber::__construct	public	function	PostRenderSubscriber constructor.