Mercurial > hg > isophonics-drupal-site
view core/lib/Drupal/Core/EventSubscriber/HtmlResponsePlaceholderStrategySubscriber.php @ 0:4c8ae668cc8c
Initial import (non-working)
author | Chris Cannam |
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date | Wed, 29 Nov 2017 16:09:58 +0000 |
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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\FilterResponseEvent; 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\FilterResponseEvent $event * The event to process. */ public function onRespond(FilterResponseEvent $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() { // Run shortly before HtmlResponseSubscriber. $events[KernelEvents::RESPONSE][] = ['onRespond', 5]; return $events; } }