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| <?php namespace App\Http\Middleware;
use Closure; use Illuminate\Cache\RateLimiter; use Symfony\Component\HttpFoundation\Response;
class ThrottleRequests {
protected $limiter;
public function __construct(RateLimiter $limiter) { $this->limiter = $limiter; }
public function handle($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, $maxAttempts) ); }
protected function resolveRequestSignature($request) { return sha1( $request->method() . '|' . $request->server('SERVER_NAME') . '|' . $request->path() . '|' . $request->ip() ); }
protected function buildResponse($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 ); }
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 $response; }
protected function calculateRemainingAttempts($key, $maxAttempts, $retryAfter = null) { if (!is_null($retryAfter)) { return 0; }
return $this->limiter->retriesLeft($key, $maxAttempts); } }
|