DocumentLinks.php

<?php

namespace Drupal\arti_custom\Plugin\ExtraField\Display;

use Drupal\Component\Render\FormattableMarkup;
use Drupal\Core\Entity\ContentEntityInterface;
use Drupal\Core\Link;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\Url;
use Drupal\extra_field\Plugin\ExtraFieldDisplayBase;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Document links Extra field Display.
 *
 * @ExtraFieldDisplay(
 *   id = "document_links",
 *   label = @Translation("Document links"),
 *   bundles = {
 *     "node.document",
 *   }
 * )
 */
class DocumentLinks extends ExtraFieldDisplayBase implements ContainerFactoryPluginInterface {

  use StringTranslationTrait;

  /**
   * The current request object.
   *
   * @var \Symfony\Component\HttpFoundation\Request
   */
  protected $currentRequest;

  /**
   * Constructs a ExtraFieldDisplayFormattedBase object.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
   *   The request stack.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, RequestStack $request_stack) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);

    $this->currentRequest = $request_stack->getCurrentRequest();
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration, $plugin_id, $plugin_definition,
      $container->get('request_stack')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function view(ContentEntityInterface $entity) {
    $elements['#theme'] = 'document_links';

    /** @var \Drupal\Core\Field\EntityReferenceFieldItemList $mediaFiles */
    $mediaFiles = $entity->get('field_files');
    foreach ($mediaFiles->getIterator() as $item) {
      /** @var \Drupal\media\MediaInterface $media */
      $media = $item->entity;
      /** @var $file \Drupal\file\FileInterface */
      $file = $media->get('field_media_file')->entity;
      $mimeType = $file->getMimeType();
      $url = Url::fromUri(file_create_url($file->getFileUri()));

      if ($mimeType == 'application/pdf') {
        $elements['#is_pdf'] = TRUE;
        $elements['#pdf'] = Link::fromTextAndUrl(t('Read @doctype', ['@doctype' => '.pdf']), $url)->toRenderable();

      }
      else {
        $elements['#is_word'] = TRUE;
        $elements['#word'] = Link::fromTextAndUrl(t('Read @doctype', ['@doctype' => '.doc(x)']), $url)->toRenderable();

        \Drupal::logger('arti')->debug('Mime type: ' . $mimeType . ' ' . $file->getFileUri());
      }
    }
    if (empty($elements['#pdf']) || $elements['#is_pdf'] == FALSE) {
      $elements['#is_pdf'] = FALSE;
      $elements['#pdf'] = new FormattableMarkup('Read @doctype', ['@doctype' => '.pdf']);
    }
    if (empty($elements['#word']) || $elements['#is_word'] == FALSE) {
      $elements['#is_word'] = FALSE;
      $elements['#word'] = new FormattableMarkup('Read @doctype', ['@doctype' => '.doc(x)']);
    }

    return $elements;
  }

}