class DrupalImage

class DrupalImage extends CKEditorPluginBase implements CKEditorPluginConfigurableInterface {
  
  /**
   * {@inheritdoc}
   */
  public function getFile() {
    return $this->getModulePath('ckeditor') . '/js/plugins/drupalimage/plugin.js';
  }
  
  /**
   * {@inheritdoc}
   */
  public function getLibraries(Editor $editor) {
    return [
      'core/drupal.ajax',
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function getConfig(Editor $editor) {
    return [
      'drupalImage_dialogTitleAdd' => $this->t('Insert Image'),
      'drupalImage_dialogTitleEdit' => $this->t('Edit Image'),
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function getButtons() {
    return [
      'DrupalImage' => [
        'label' => $this->t('Image'),
        'image' => $this->getModulePath('ckeditor') . '/js/plugins/drupalimage/icons/drupalimage.png',
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   *
   * @see \Drupal\editor\Form\EditorImageDialog
   * @see editor_image_upload_settings_form()
   */
  public function settingsForm(array $form, FormStateInterface $form_state, Editor $editor) {
    $form_state->loadInclude('editor', 'admin.inc');
    $form['image_upload'] = editor_image_upload_settings_form($editor);
    $form['image_upload']['#attached']['library'][] = 'ckeditor/drupal.ckeditor.drupalimage.admin';
    $form['image_upload']['#element_validate'][] = [
      $this,
      'validateImageUploadSettings',
    ];
    return $form;
  }
  
  /**
   * #element_validate handler for the "image_upload" element in settingsForm().
   *
   * Moves the text editor's image upload settings from the DrupalImage plugin's
   * own settings into $editor->image_upload.
   *
   * @see \Drupal\editor\Form\EditorImageDialog
   * @see editor_image_upload_settings_form()
   */
  public function validateImageUploadSettings(array $element, FormStateInterface $form_state) {
    $settings =& $form_state->getValue([
      'editor',
      'settings',
      'plugins',
      'drupalimage',
      'image_upload',
    ]);
    $form_state->get('editor')
      ->setImageUploadSettings($settings);
    $form_state->unsetValue([
      'editor',
      'settings',
      'plugins',
      'drupalimage',
    ]);
  }

}