Created
August 11, 2017 13:42
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Rate limits with FOSAuthServerBundle
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| <?php | |
| namespace MyApp\ApiBundle\Listener; | |
| use Symfony\Component\HttpKernel\Event\FilterResponseEvent; | |
| use Symfony\Component\HttpKernel\Event\GetResponseEvent; | |
| use Symfony\Component\HttpFoundation\Response; | |
| use Symfony\Component\HttpKernel\HttpKernelInterface; | |
| use Symfony\Component\HttpFoundation\Cookie; | |
| use Doctrine\ORM\EntityManager; | |
| use FOS\OAuthServerBundle\Storage\OAuthStorage; | |
| use Symfony\Component\Security\Core\SecurityContext; | |
| use Doctrine\Bundle\DoctrineBundle\Registry; | |
| use JMS\DiExtraBundle\Annotation AS DI; | |
| use Predis\Client; | |
| /** | |
| * @DI\Service | |
| */ | |
| class RateLimitListener | |
| { | |
| /** | |
| * @var \Predis\Client | |
| */ | |
| private $redis; | |
| /** | |
| * @var \Symfony\Component\Security\Core\SecurityContext | |
| */ | |
| private $securityContext; | |
| /** | |
| * @var \FOS\OAuthServerBundle\Storage\OAuthStorage | |
| */ | |
| private $storage; | |
| /** | |
| * @var int | |
| */ | |
| private $limit; | |
| /** | |
| * @var int | |
| */ | |
| private $remaining; | |
| /** | |
| * @var int | |
| */ | |
| private $reset; | |
| /** | |
| * @var string | |
| */ | |
| private $key_limit; | |
| /** | |
| * @var string | |
| */ | |
| private $key_remaining; | |
| /** | |
| * @DI\InjectParams({ | |
| * "redis" = @DI\Inject("redis"), | |
| * "securityContext" = @DI\Inject("security.context"), | |
| * "storage" = @DI\Inject("fos_oauth_server.storage"), | |
| * "keyLimit" = @DI\Inject("%redis.keys.ratelimit_limit%"), | |
| * "keyRemaining" = @DI\Inject("%redis.keys.ratelimit_remaining%") | |
| * }) | |
| * | |
| * @param \Symfony\Component\Security\Core\SecurityContext $securityContext | |
| */ | |
| public function __construct(Client $redis, SecurityContext $securityContext, OAuthStorage $storage, $keyLimit, $keyRemaining) | |
| { | |
| $this->redis = $redis; | |
| $this->securityContext = $securityContext; | |
| $this->storage = $storage; | |
| $this->key_limit = $keyLimit; | |
| $this->key_remaining = $keyRemaining; | |
| } | |
| private function setHeaders(Response $response) | |
| { | |
| $response->headers->add(array( | |
| 'X-RateLimit-Limit' => $this->limit, | |
| 'X-RateLimit-Remaining' => $this->remaining, | |
| 'X-RateLimit-Reset' => $this->reset | |
| )); | |
| } | |
| /** | |
| * @DI\Observe("kernel.request", priority = 7) | |
| */ | |
| public function onKernelRequest(GetResponseEvent $event) | |
| { | |
| if(HttpKernelInterface::MASTER_REQUEST !== $event->getRequestType()) | |
| return; | |
| if(substr($event->getRequest()->getRequestUri(), 0, 4) != "/api") | |
| return; | |
| $access_token = $this->securityContext->getToken()->getCredentials(); | |
| $keyLimit = sprintf($this->key_limit, $access_token); | |
| $keyRemaining = sprintf($this->key_remaining, $access_token); | |
| if($this->redis->exists($keyLimit)) | |
| { | |
| $this->limit = $this->redis->get($keyLimit); | |
| $this->remaining = $this->redis->get($keyRemaining); | |
| $this->reset = time() + $this->redis->ttl($keyRemaining); | |
| } | |
| else | |
| { | |
| $token = $this->storage->getAccessToken($access_token); | |
| $limit = $token->getClient()->getRateLimit(); | |
| if($limit === null) | |
| return; | |
| $this->redis->set($keyLimit, $this->limit = $limit); | |
| $this->redis->set($keyRemaining, $this->remaining = $limit); | |
| $this->redis->expire($keyLimit, 3600); | |
| $this->redis->expire($keyRemaining, 3600); | |
| $this->reset = time() + 3600; | |
| } | |
| $remaining = $this->redis->decr($keyRemaining); | |
| $this->remaining = $remaining > 0 ? $remaining : 0; | |
| if($this->remaining == 0) | |
| { | |
| $response = new Response(sprintf( | |
| 'You exceeded the rate limit of %d requests per hour.', | |
| $this->limit | |
| ), 403); | |
| $this->setHeaders($response); | |
| $event->setResponse($response); | |
| $event->stopPropagation(); | |
| return; | |
| } | |
| } | |
| /** | |
| * @DI\Observe("kernel.response") | |
| */ | |
| public function onKernelResponse(FilterResponseEvent $event) | |
| { | |
| if(HttpKernelInterface::MASTER_REQUEST !== $event->getRequestType()) | |
| return; | |
| if(substr($event->getRequest()->getRequestUri(), 0, 4) != "/api") | |
| return; | |
| $this->setHeaders($event->getResponse()); | |
| } | |
| } |
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