class DrupalMedia

class DrupalMedia extends PluginBase implements ContainerFactoryPluginInterface, CKEditorPluginContextualInterface, CKEditorPluginCssInterface {
  
  /**
   * The module extension list.
   *
   * @var \Drupal\Core\Extension\ModuleExtensionList
   */
  protected $moduleExtensionList;
  
  /**
   * Constructs a new DrupalMedia plugin 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 array $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Extension\ModuleExtensionList $extension_list_module
   *   The module extension list.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, ModuleExtensionList $extension_list_module) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->moduleExtensionList = $extension_list_module;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container->get('extension.list.module'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function isInternal() {
    return FALSE;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDependencies(Editor $editor) {
    return [];
  }
  
  /**
   * {@inheritdoc}
   */
  public function getLibraries(Editor $editor) {
    return [
      'core/jquery',
      'core/drupal',
      'core/drupal.ajax',
      // @see Drupal.theme.mediaEmbedPreviewError()
'media/media_embed_ckeditor_theme',
      // @see Drupal.theme.mediaEmbedEditButton()
'ckeditor/drupal.ckeditor.plugins.drupalmedia',
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFile() {
    return $this->moduleExtensionList
      ->getPath('ckeditor') . '/js/plugins/drupalmedia/plugin.js';
  }
  
  /**
   * {@inheritdoc}
   */
  public function getConfig(Editor $editor) {
    return [
      'drupalMedia_previewCsrfToken' => \Drupal::csrfToken()->get('X-Drupal-MediaPreview-CSRF-Token'),
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function isEnabled(Editor $editor) {
    if (!$editor->hasAssociatedFilterFormat()) {
      return FALSE;
    }
    // Automatically enable this plugin if the text format associated with this
    // text editor uses the media_embed filter.
    $filters = $editor->getFilterFormat()
      ->filters();
    return $filters->has('media_embed') && $filters->get('media_embed')->status;
  }
  
  /**
   * {@inheritdoc}
   *
   * @todo Improve this in https://www.drupal.org/project/drupal/issues/3072063
   */
  public function getCssFiles(Editor $editor) {
    return [
      $this->moduleExtensionList
        ->getPath('ckeditor') . '/css/plugins/drupalmedia/ckeditor.drupalmedia.css',
      $this->moduleExtensionList
        ->getPath('system') . '/css/components/hidden.module.css',
    ];
  }

}