Drupal 8: Подготовка ответа для основного содержимого

<?php

namespace Drupal\example\Render\MainContent;

use Drupal\Core\Controller\TitleResolverInterface;
use Drupal\Core\Render\MainContent\MainContentRendererInterface;
use Drupal\Core\Render\RendererInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;

/**
 * Example renderer which render to HTML and return it as JSON.
 */
class DirtyJsonRenderer implements MainContentRendererInterface {

  /**
   * The renderer.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * The title resolver.
   *
   * @var \Drupal\Core\Controller\TitleResolverInterface
   */
  protected $titleResolver;

  /**
   * Constructs a new DirtyJsonRenderer object.
   *
   * @param \Drupal\Core\Render\RendererInterface $renderer
   *   The renderer.
   */
  public function __construct(RendererInterface $renderer, TitleResolverInterface $title_resolver) {
    $this->renderer = $renderer;
    $this->titleResolver = $title_resolver;
  }

  /**
   * {@inheritdoc}
   */
  public function renderResponse(array $main_content, Request $request, RouteMatchInterface $route_match) {
    $title = isset($main_content['#title']) ? $main_content['#title'] : $this->titleResolver->getTitle($request, $route_match->getRouteObject());
    $html = $this->renderer->renderPlain($main_content);

    $result = [
      'title' => $title,
      'content' => $html,
    ];

    return new JsonResponse($result);
  }

}