<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\WebLink\EventListener;
use Psr\Link\LinkProviderInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\WebLink\HttpHeaderSerializer;
// Help opcache.preload discover always-needed symbols
class_exists(HttpHeaderSerializer::class);
/**
* Adds the Link HTTP header to the response.
*
* @author Kévin Dunglas <[email protected]>
*
* @final
*/
class AddLinkHeaderListener implements EventSubscriberInterface
{
private $serializer;
public function __construct()
{
$this->serializer = new HttpHeaderSerializer();
}
public function onKernelResponse(ResponseEvent $event)
{
if (!$event->isMainRequest()) {
return;
}
$linkProvider = $event->getRequest()->attributes->get('_links');
if (!$linkProvider instanceof LinkProviderInterface || !$links = $linkProvider->getLinks()) {
return;
}
$event->getResponse()->headers->set('Link', $this->serializer->serialize($links), false);
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array
{
return [KernelEvents::RESPONSE => 'onKernelResponse'];
}
}