FilterImageLinkToSource.php in Image Resize Filter 8

Namespace

Drupal\image_resize_filter\Plugin\Filter

File

src/Plugin/Filter/FilterImageLinkToSource.php

<?php

namespace Drupal\image_resize_filter\Plugin\Filter;

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

/**
 * Provides a filter to link images derivates to source (original) image.
 *
 * @Filter(
 *   id = "filter_image_link_to_source",
 *   title = @Translation("Image Resize Filter: Link images derivates to source"),
 *   description = @Translation("Link an image derivate to its source (original) image."),
 *   type = Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_REVERSIBLE
 * )
 */
class FilterImageLinkToSource extends FilterBase {

  /**
   * {@inheritdoc}
   */
  public function process($text, $langcode) {
    $result = new FilterProcessResult($text);
    $dom = Html::load($text);
    $xpath = new \DOMXPath($dom);

    /** @var \DOMNode $node */
    foreach ($xpath
      ->query('//img') as $node) {

      // Read the data-align attribute's value, then delete it.
      $width = $node
        ->getAttribute('width');
      $height = $node
        ->getAttribute('height');
      $src = $node
        ->getAttribute('src');
      if (!UrlHelper::isExternal($src)) {
        if ($width || $height) {

          /** @var \DOMNode $element */
          $element = $dom
            ->createElement('a');
          $element
            ->setAttribute('href', $src);
          $node->parentNode
            ->replaceChild($element, $node);
          $element
            ->appendChild($node);
        }
      }
    }
    $result
      ->setProcessedText(Html::serialize($dom));
    return $result;
  }

}

Classes

Name	Description
FilterImageLinkToSource	Provides a filter to link images derivates to source (original) image.