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<?php

namespace Drupal\Core\EventSubscriber;

use Drupal\Core\Render\HtmlResponse;
use Drupal\Core\Render\AttachmentsResponseProcessorInterface;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Response subscriber to handle HTML responses.
 */
class HtmlResponseSubscriber implements EventSubscriberInterface {

  /**
   * The HTML response attachments processor service.
   *
   * @var \Drupal\Core\Render\AttachmentsResponseProcessorInterface
   */
  protected $htmlResponseAttachmentsProcessor;

  /**
   * Constructs a HtmlResponseSubscriber object.
   *
   * @param \Drupal\Core\Render\AttachmentsResponseProcessorInterface $html_response_attachments_processor
   *   The HTML response attachments processor service.
   */
  public function __construct(AttachmentsResponseProcessorInterface $html_response_attachments_processor) {
    $this->htmlResponseAttachmentsProcessor = $html_response_attachments_processor;
  }

  /**
   * Processes attachments for HtmlResponse responses.
   *
   * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
   *   The event to process.
   */
  public function onRespond(FilterResponseEvent $event) {
    $response = $event->getResponse();
    if (!$response instanceof HtmlResponse) {
      return;
    }

    $event->setResponse($this->htmlResponseAttachmentsProcessor->processAttachments($response));
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events[KernelEvents::RESPONSE][] = ['onRespond'];
    return $events;
  }

}