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<?php

namespace Drupal\file\Plugin\Field\FieldFormatter;

use Drupal\Core\Field\FieldItemListInterface;

/**
 * Plugin implementation of the 'file_rss_enclosure' formatter.
 *
 * @FieldFormatter(
 *   id = "file_rss_enclosure",
 *   label = @Translation("RSS enclosure"),
 *   field_types = {
 *     "file"
 *   }
 * )
 */
class RSSEnclosureFormatter extends FileFormatterBase {

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $entity = $items->getEntity();
    // Add the first file as an enclosure to the RSS item. RSS allows only one
    // enclosure per item. See: http://wikipedia.org/wiki/RSS_enclosure
    foreach ($this->getEntitiesToView($items, $langcode) as $delta => $file) {
      /** @var \Drupal\file\FileInterface $file */
      $entity->rss_elements[] = [
        'key' => 'enclosure',
        'attributes' => [
          // In RSS feeds, it is necessary to use absolute URLs. The 'url.site'
          // cache context is already associated with RSS feed responses, so it
          // does not need to be specified here.
          'url' => $file->createFileUrl(FALSE),
          'length' => $file->getSize(),
          'type' => $file->getMimeType(),
        ],
      ];
    }
    return [];
  }

}