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<?php |
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/** |
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* This file is part of the Rate Limit package. |
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* |
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* Copyright (c) Nikola Posa |
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* |
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* For full copyright and license information, please refer to the LICENSE file, |
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* located at the package root folder. |
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*/ |
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declare(strict_types=1); |
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namespace RateLimit; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use RateLimit\Storage\StorageInterface; |
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use RateLimit\Identity\IdentityResolverInterface; |
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use RateLimit\Options\RequestsPerWindowOptions; |
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use RateLimit\Exception\StorageValueNotFoundException; |
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/** |
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* @author Nikola Posa <[email protected]> |
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*/ |
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final class RequestsPerWindowRateLimiter extends AbstractRateLimiter |
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{ |
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const LIMIT_EXCEEDED_HTTP_STATUS_CODE = 429; //HTTP 429 "Too Many Requests" (RFC 6585) |
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const HEADER_LIMIT = 'X-RateLimit-Limit'; |
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const HEADER_REMAINING = 'X-RateLimit-Remaining'; |
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const HEADER_RESET = 'X-RateLimit-Reset'; |
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/** |
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* @var RequestsPerWindowOptions |
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*/ |
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private $options; |
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/** |
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* @var string |
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*/ |
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private $identity; |
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public function __construct(StorageInterface $storage, IdentityResolverInterface $identityResolver, RequestsPerWindowOptions $options) |
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{ |
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parent::__construct($storage, $identityResolver); |
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$this->options = $options; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function __invoke(RequestInterface $request, ResponseInterface $response, callable $out = null) |
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{ |
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if ($this->whitelist($request)) { |
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return $this->next($request, $response, $out); |
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} |
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$this->resolveIdentity($request); |
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try { |
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$current = $this->getCurrent(); |
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if ($this->isLimitExceeded($current)) { |
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return $this->onLimitExceeded($request, $response); |
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} |
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$this->hit(); |
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} catch (StorageValueNotFoundException $ex) { |
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$this->initialHit(); |
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} |
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return $this->onBelowLimit($request, $response, $out); |
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} |
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private function whitelist(RequestInterface $request) |
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{ |
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$whitelist = $this->options->getWhitelist(); |
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return $whitelist($request); |
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} |
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private function resolveIdentity(RequestInterface $request) |
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{ |
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$this->identity = $this->identityResolver->getIdentity($request); |
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} |
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private function getCurrent() : int |
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{ |
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return $this->storage->get($this->identity); |
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} |
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private function isLimitExceeded($current) : bool |
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{ |
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return ($current >= $this->options->getLimit()); |
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} |
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private function initialHit() |
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{ |
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$this->storage->set($this->identity, 1, $this->options->getWindow()); |
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} |
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private function hit() |
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{ |
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$this->storage->increment($this->identity, 1); |
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} |
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private function onLimitExceeded(RequestInterface $request, ResponseInterface $response) : ResponseInterface |
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{ |
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$response = $this |
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->setRateLimitHeaders($response) |
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->withStatus(self::LIMIT_EXCEEDED_HTTP_STATUS_CODE) |
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; |
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$limitExceededHandler = $this->options->getLimitExceededHandler(); |
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$response = $limitExceededHandler($request, $response); |
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return $response; |
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} |
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private function onBelowLimit(RequestInterface $request, ResponseInterface $response, callable $out = null) : ResponseInterface |
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{ |
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$response = $this->setRateLimitHeaders($response); |
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return $this->next($request, $response, $out); |
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} |
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private function next(RequestInterface $request, ResponseInterface $response, callable $out = null) |
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{ |
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return $out ? $out($request, $response) : $response; |
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} |
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private function setRateLimitHeaders(ResponseInterface $response) : ResponseInterface |
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{ |
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return $response |
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->withHeader(self::HEADER_LIMIT, (string) $this->options->getLimit()) |
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->withHeader(self::HEADER_REMAINING, (string) ($this->options->getLimit() - $this->getCurrent())) |
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->withHeader(self::HEADER_RESET, (string) (time() + $this->storage->ttl($this->identity))) |
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; |
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} |
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} |
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nikolaposa /
rate-limit
