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<?php |
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/** |
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* This file contains only the RateLimitSubscriber class. |
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*/ |
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namespace AppBundle\EventSubscriber; |
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use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException; |
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use Symfony\Component\DependencyInjection\Container; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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use Symfony\Component\HttpKernel\Event\FilterControllerEvent; |
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use Symfony\Component\HttpKernel\KernelEvents; |
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use Psr\Cache\CacheItemPoolInterface; |
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use Psr\Log\LoggerInterface; |
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use DateInterval; |
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/** |
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* A RateLimitSubscriber checks to see if users are exceeding usage limitations. |
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*/ |
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class RateLimitSubscriber implements EventSubscriberInterface |
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{ |
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/** @var Container The DI container. */ |
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protected $container; |
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/** @var int Number of requests allowed in time period */ |
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protected $rateLimit; |
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/** @var int Number of minutes during which $rateLimit requests are permitted */ |
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protected $rateDuration; |
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/** |
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* Save the container for later use. |
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* @param Container $container The DI container. |
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*/ |
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public function __construct(Container $container) |
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{ |
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$this->container = $container; |
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} |
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/** |
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* Register our interest in the kernel.controller event. |
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* @return string[] |
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*/ |
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public static function getSubscribedEvents() |
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{ |
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return [ |
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KernelEvents::CONTROLLER => 'onKernelController', |
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]; |
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} |
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/** |
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* Check if the current user has exceeded the configured usage limitations. |
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* @param FilterControllerEvent $event The event. |
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* @throws AccessDeniedHttpException If rate limits have been exceeded. |
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*/ |
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public function onKernelController(FilterControllerEvent $event) |
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{ |
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$this->rateLimit = (int) $this->container->getParameter('app.rate_limit_count'); |
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$this->rateDuration = (int) $this->container->getParameter('app.rate_limit_time'); |
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// Zero values indicate the rate limiting feature should be disabled. |
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if ($this->rateLimit === 0 || $this->rateDuration === 0) { |
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return; |
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} |
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$controller = $event->getController(); |
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$loggedIn = (bool) $this->container->get('session')->get('logged_in_user'); |
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// No rate limits on index pages or if they are logged in. |
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if ($controller[1] === 'indexAction' || $loggedIn) { |
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return; |
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} |
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$request = $event->getRequest(); |
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$this->checkBlacklist($request); |
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// Build and fetch cache key based on session ID and requested URI, |
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// removing any reserved characters from URI. |
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$uri = preg_replace('/[^a-zA-Z0-9,\.]/', '', $request->getRequestUri()); |
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$sessionId = $request->getSession()->getId(); |
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$cacheKey = 'ratelimit.'.$sessionId.'.'.$uri; |
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$cache = $this->container->get('cache.app'); |
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$cacheItem = $cache->getItem($cacheKey); |
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// If increment value already in cache, or start with 1. |
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$count = $cacheItem->isHit() ? (int) $cacheItem->get() + 1 : 1; |
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// Check if limit has been exceeded, and if so, throw an error. |
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if ($count > $this->rateLimit) { |
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$this->denyAccess($request, 'Exceeded rate limitation'); |
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} |
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// Reset the clock on every request. |
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$cacheItem->set($count) |
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->expiresAfter(new DateInterval('PT'.$this->rateDuration.'M')); |
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$cache->save($cacheItem); |
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} |
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/** |
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* Check the request against blacklisted URIs and user agents |
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* @param \Symfony\Component\HttpFoundation\Request $request |
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*/ |
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private function checkBlacklist(\Symfony\Component\HttpFoundation\Request $request) |
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{ |
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// First check user agent and URI blacklists |
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if ($this->container->hasParameter('request_blacklist')) { |
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$blacklist = $this->container->getParameter('request_blacklist'); |
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// User agents |
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if (is_array($blacklist['user_agent'])) { |
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foreach ($blacklist['user_agent'] as $ua) { |
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if (strpos($request->headers->get('User-Agent'), $ua) !== false) { |
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$this->denyAccess($request, "Matched blacklisted user agent `$ua`"); |
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} |
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} |
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} |
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// URIs |
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if (is_array($blacklist['uri'])) { |
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foreach ($blacklist['uri'] as $uri) { |
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if (strpos($request->getRequestUri(), $uri) !== false) { |
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$this->denyAccess($request, "Matched blacklisted URI `$uri`"); |
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} |
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} |
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} |
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} |
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} |
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/** |
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* Throw exception for denied access due to spider crawl or hitting usage limits. |
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* @param \Symfony\Component\HttpFoundation\Request $request |
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* @param string $logComment Comment to include with the log entry. |
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* @todo i18n |
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*/ |
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private function denyAccess(\Symfony\Component\HttpFoundation\Request $request, $logComment = '') |
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{ |
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// Log the denied request |
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$logger = $this->container->get('monolog.logger.rate_limit'); |
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$logger->info( |
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"<URI>: " . $request->getRequestUri() . |
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($logComment != '' ? "\t<Reason>: $logComment" : '') . |
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"\t<User agent>: " . $request->headers->get('User-Agent') |
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); |
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throw new AccessDeniedHttpException("Possible spider crawl detected. " . |
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'If you are human, you are making too many requests during a short period of time. ' . |
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"Please wait $this->rateDuration minutes before reloading this tool. You can then " . |
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'login to prevent this from happening again.'); |
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} |
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} |
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x-tools /
xtools
