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<?php
namespace Drupal\Core\EventSubscriber;
use Drupal\Core\Render\HtmlResponse;
use Drupal\Core\Render\Placeholder\PlaceholderStrategyInterface;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
/**
* HTML response subscriber to allow for different placeholder strategies.
*
* This allows core and contrib to coordinate how to render placeholders;
* e.g. an EsiRenderStrategy could replace the placeholders with ESI tags,
* while e.g. a BigPipeRenderStrategy could store the placeholders in a
* BigPipe service and render them after the main content has been sent to
* the client.
*/
class HtmlResponsePlaceholderStrategySubscriber implements EventSubscriberInterface {
/**
* The placeholder strategy to use.
*
* @var \Drupal\Core\Render\Placeholder\PlaceholderStrategyInterface
*/
protected $placeholderStrategy;
/**
* Constructs a HtmlResponsePlaceholderStrategySubscriber object.
*
* @param \Drupal\Core\Render\Placeholder\PlaceholderStrategyInterface $placeholder_strategy
* The placeholder strategy to use.
*/
public function __construct(PlaceholderStrategyInterface $placeholder_strategy) {
$this->placeholderStrategy = $placeholder_strategy;
}
/**
* Processes placeholders for HTML responses.
*
* @param \Symfony\Component\HttpKernel\Event\ResponseEvent $event
* The event to process.
*/
public function onRespond(ResponseEvent $event) {
$response = $event->getResponse();
if (!$response instanceof HtmlResponse) {
return;
}
$attachments = $response->getAttachments();
if (empty($attachments['placeholders'])) {
return;
}
$attachments['placeholders'] = $this->placeholderStrategy->processPlaceholders($attachments['placeholders']);
$response->setAttachments($attachments);
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array {
// Run shortly before HtmlResponseSubscriber.
$events[KernelEvents::RESPONSE][] = ['onRespond', 5];
return $events;
}
}
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