<?php
/*
* This file is part of the API Platform project.
*
* (c) Kévin Dunglas <dunglas@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace ApiPlatform\Hydra\EventListener;
use ApiPlatform\Api\UrlGeneratorInterface as LegacyUrlGeneratorInterface;
use ApiPlatform\JsonLd\ContextBuilder;
use ApiPlatform\Metadata\UrlGeneratorInterface;
use ApiPlatform\State\Util\CorsTrait;
use Psr\Link\EvolvableLinkProviderInterface;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\WebLink\GenericLinkProvider;
use Symfony\Component\WebLink\Link;
/**
* Adds the HTTP Link header pointing to the Hydra documentation.
*
* @author Kévin Dunglas <dunglas@gmail.com>
*/
final class AddLinkHeaderListener
{
use CorsTrait;
public function __construct(private readonly UrlGeneratorInterface|LegacyUrlGeneratorInterface $urlGenerator)
{
}
/**
* Sends the Hydra header on each response.
*/
public function onKernelResponse(ResponseEvent $event): void
{
$request = $event->getRequest();
if (($operation = $request->attributes->get('_api_operation')) && 'api_platform.symfony.main_controller' === $operation->getController()) {
return;
}
// Prevent issues with NelmioCorsBundle
if ($this->isPreflightRequest($request)) {
return;
}
$apiDocUrl = $this->urlGenerator->generate('api_doc', ['_format' => 'jsonld'], UrlGeneratorInterface::ABS_URL);
$apiDocLink = new Link(ContextBuilder::HYDRA_NS.'apiDocumentation', $apiDocUrl);
$linkProvider = $request->attributes->get('_api_platform_links', new GenericLinkProvider());
if (!$linkProvider instanceof EvolvableLinkProviderInterface) {
return;
}
foreach ($linkProvider->getLinks() as $link) {
if ($link->getHref() === $apiDocUrl) {
return;
}
}
$request->attributes->set('_api_platform_links', $linkProvider->withLink($apiDocLink));
}
}