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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Yii\Web\RateLimiter; |
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use Psr\Http\Message\ResponseFactoryInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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/** |
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* RateLimiter limits the number of consequential requests ({@see CacheCounter::$limit}) that could be processed per |
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* {@see CacheCounter::$interval}. If the number is reached, middleware responds with HTTP code 429, "Too Many Requests" |
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* until limit expires. |
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*/ |
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final class RateLimiter implements MiddlewareInterface |
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{ |
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private CacheCounter $counter; |
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private ResponseFactoryInterface $responseFactory; |
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private string $counterId; |
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/** |
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* @var callable |
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*/ |
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private $counterIdCallback; |
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public function __construct(CacheCounter $counter, ResponseFactoryInterface $responseFactory) |
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{ |
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$this->counter = $counter; |
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$this->responseFactory = $responseFactory; |
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} |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$this->counter->setId($this->generateId($request)); |
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if ($this->counter->limitIsReached()) { |
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return $this->createErrorResponse(); |
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} |
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return $handler->handle($request); |
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} |
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public function withCounterIdCallback(callable $callback): self |
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{ |
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$this->counterIdCallback = $callback; |
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return $this; |
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} |
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public function withCounterId(string $id): self |
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{ |
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$this->counterId = $id; |
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return $this; |
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} |
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private function createErrorResponse(): ResponseInterface |
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{ |
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$response = $this->responseFactory->createResponse(429); |
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$response->getBody()->write('Too Many Requests'); |
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return $response; |
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} |
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private function generateId(ServerRequestInterface $request): string |
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{ |
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if ($this->counterIdCallback !== null) { |
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return \call_user_func($this->counterIdCallback, $request); |
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} |
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return $this->counterId ?? $this->generateIdFromRequest($request); |
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} |
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private function generateIdFromRequest(ServerRequestInterface $request): string |
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{ |
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return strtolower('rate-limiter-' . $request->getMethod() . '-' . $request->getUri()->getPath()); |
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} |
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} |
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yiisoft /
yii-web
