NoopenerFilter.php in Noopener Filter 8

Namespace

Drupal\noopener_filter\Plugin\Filter

File

src/Plugin/Filter/NoopenerFilter.php

<?php

namespace Drupal\noopener_filter\Plugin\Filter;

use Drupal\Component\Utility\Html;
use Drupal\filter\FilterProcessResult;
use Drupal\filter\Plugin\FilterBase;

/**
 * Define class NoopenerFilter.
 *
 * @Filter(
 *   id = "filter_noopener",
 *   title = @Translation("Add noopener to all links"),
 *   type = Drupal\filter\Plugin\FilterInterface::TYPE_HTML_RESTRICTOR
 * )
 */
class NoopenerFilter extends FilterBase {

  /**
   * Implement processAttributes().
   */
  public function processAttributes($text) {
    $html_dom = Html::load($text);
    $links = $html_dom
      ->getElementsByTagName('a');
    foreach ($links as $link) {
      if (!empty($link
        ->getAttribute('target')) && $link
        ->getAttribute('target') === '_blank') {
        if (!empty($link
          ->getAttribute('rel'))) {
          $link
            ->setAttribute('rel', 'noopener ' . $link
            ->getAttribute('rel'));
        }
        else {
          $link
            ->setAttribute('rel', 'noopener');
        }
      }
    }
    $text = Html::serialize($html_dom);
    return trim($text);
  }

  /**
   * {@inheritdoc}
   */
  public function process($text, $langcode) {
    return new FilterProcessResult($this
      ->processAttributes($text));
  }

}

Classes

Name	Description
NoopenerFilter	Define class NoopenerFilter.