wysiwyg_template-3.0.x-dev/src/Controller/TemplateController.php

<?php

namespace Drupal\wysiwyg_template\Controller;

use Drupal\Core\Controller\ControllerBase;
use Drupal\wysiwyg_template\Entity\Template;
use stdClass;
use Symfony\Component\HttpFoundation\Response;

/**
 * Default controller for the wysiwyg_template module.
 */
class TemplateController extends ControllerBase {

  /**
   * A list of available templates based on the entity type and bundle.
   *
   * @param string $entity_type
   *   The entity type.
   * @param string $bundle
   *   The bundle.
   *
   * @return \Symfony\Component\HttpFoundation\Response
   *   The template callback JS.
   *
   * @see https://www.drupal.org/node/2693221
   */
  public function listJson($entity_type, $bundle): Response {
    $templates = [
      // @todo Support images.
      'imagesPath' => FALSE,
    ];
    foreach (Template::loadByTypeAndBundle($entity_type, $bundle) as $template) {
      $json_template = new stdClass();
      $json_template->title = $template->label();
      // @todo Images.
      // @see https://www.drupal.org/node/2692469
      $json_template->description = $template->getDescription();
      $json_template->html = $template->getBody();

      $templates['templates'][] = $json_template;
    }

    $templates = json_encode($templates);

    $script = <<<"EOL"
CKEDITOR.addTemplates( 'default', $templates);
EOL;

    $response = new Response($script);
    $response->headers->set('Content-Type', 'text/javascript');
    return $response;
  }

}