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<?php |
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namespace Nord\Lumen\Core\Middleware; |
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use Closure; |
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use Illuminate\Cache\RateLimiter; |
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use Illuminate\Http\Request; |
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use Nord\Lumen\Core\Traits\CreatesHttpResponses; |
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use Symfony\Component\HttpFoundation\Response; |
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class ThrottleRequests |
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{ |
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use CreatesHttpResponses; |
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/** |
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* The rate limiter instance. |
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* |
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* @var RateLimiter |
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*/ |
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private $rateLimiter; |
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/** |
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* Create a new request throttler. |
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* |
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* @param RateLimiter $rateLimiter |
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*/ |
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public function __construct(RateLimiter $rateLimiter) |
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{ |
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$this->rateLimiter = $rateLimiter; |
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} |
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/** |
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* Handle an incoming request. |
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* |
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* @param Request $request |
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* @param Closure $next |
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* @param int $maxAttempts |
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* @param int $decayMinutes |
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* |
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* @return mixed |
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*/ |
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public function handle(Request $request, Closure $next, $maxAttempts = 60, $decayMinutes = 1) |
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{ |
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$key = $this->resolveRequestSignature($request); |
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if ($this->rateLimiter->tooManyAttempts($key, $maxAttempts, $decayMinutes)) { |
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return $this->buildResponse($key, $maxAttempts); |
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} |
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$this->rateLimiter->hit($key, $decayMinutes); |
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$response = $next($request); |
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return $this->addHeaders( |
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$response, $maxAttempts, |
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$this->calculateRemainingAttempts($key, $maxAttempts) |
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); |
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} |
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/** |
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* Resolve request signature. |
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* |
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* @param Request $request |
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* |
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* @return string |
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*/ |
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protected function resolveRequestSignature($request) |
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{ |
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return sha1( |
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$request->method() . |
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'|' . $request->server('SERVER_NAME') . |
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'|' . $request->path() . |
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'|' . $request->ip() |
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); |
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} |
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/** |
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* Create a 'too many attempts' response. |
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* |
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* @param string $key |
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* @param int $maxAttempts |
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* |
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* @return Response |
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*/ |
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protected function buildResponse($key, $maxAttempts) |
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{ |
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$response = $this->errorResponse('Too Many Requests', [], 429); |
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$retryAfter = $this->rateLimiter->availableIn($key); |
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return $this->addHeaders( |
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$response, $maxAttempts, |
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$this->calculateRemainingAttempts($key, $maxAttempts, $retryAfter), |
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$retryAfter |
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); |
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} |
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/** |
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* Add the limit header information to the given response. |
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* |
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* @param Response $response |
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* @param int $maxAttempts |
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* @param int $remainingAttempts |
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* @param int|null $retryAfter |
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* |
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* @return Response |
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*/ |
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protected function addHeaders(Response $response, $maxAttempts, $remainingAttempts, $retryAfter = null) |
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{ |
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$headers = [ |
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'X-RateLimit-Limit' => $maxAttempts, |
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'X-RateLimit-Remaining' => $remainingAttempts, |
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]; |
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if (!is_null($retryAfter)) { |
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$headers['Retry-After'] = $retryAfter; |
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} |
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$response->headers->add($headers); |
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return $response; |
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} |
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/** |
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* Calculate the number of remaining attempts. |
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* |
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* @param string $key |
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* @param int $maxAttempts |
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* @param int|null $retryAfter |
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* |
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* @return int |
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*/ |
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protected function calculateRemainingAttempts($key, $maxAttempts, $retryAfter = null) |
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{ |
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if (!is_null($retryAfter)) { |
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return 0; |
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} |
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return $this->rateLimiter->retriesLeft($key, $maxAttempts); |
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} |
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} |
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nordsoftware /
lumen-core
