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