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<?php

namespace Drupal\Core\Render;

use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Cache\CacheableResponseInterface;
use Drupal\Core\Cache\CacheableResponseTrait;
use Symfony\Component\HttpFoundation\Response;

/**
 * A response that contains and can expose cacheability metadata and attachments.
 *
 * Supports Drupal's caching concepts: cache tags for invalidation and cache
 * contexts for variations.
 *
 * Supports Drupal's idea of #attached metadata: libraries, settings, http_header and html_head.
 *
 * @see \Drupal\Core\Cache\CacheableResponse
 * @see \Drupal\Core\Render\AttachmentsInterface
 * @see \Drupal\Core\Render\AttachmentsTrait
 */
class HtmlResponse extends Response implements CacheableResponseInterface, AttachmentsInterface {

  use CacheableResponseTrait;
  use AttachmentsTrait;

  /**
   * {@inheritdoc}
   */
  public function setContent($content) {
    // A render array can automatically be converted to a string and set the
    // necessary metadata.
    if (is_array($content) && (isset($content['#markup']))) {
      $content += [
        '#attached' => [
          'html_response_attachment_placeholders' => [],
          'placeholders' => [],
        ],
      ];
      $this->addCacheableDependency(CacheableMetadata::createFromRenderArray($content));
      $this->setAttachments($content['#attached']);
      $content = $content['#markup'];
    }

    return parent::setContent($content);
  }

}