/** * Checks whether the rate limit exceeds. * @param RateLimitInterface $user the current user * @param Request $request * @param Response $response * @param \yii\base\Action $action the action to be executed * @throws TooManyRequestsHttpException if rate limit exceeds */ public function checkRateLimit($user, $request, $response, $action) { $current = time(); list($limit, $window) = $user->getRateLimit($request, $action); list($allowance, $timestamp) = $user->loadAllowance($request, $action); $allowance += (int) (($current - $timestamp) * $limit / $window); if ($allowance > $limit) { $allowance = $limit; } if ($allowance < 1) { $user->saveAllowance($request, $action, 0, $current); $this->addRateLimitHeaders($response, $limit, 0, $window); throw new TooManyRequestsHttpException($this->errorMessage); } else { $user->saveAllowance($request, $action, $allowance - 1, $current); $this->addRateLimitHeaders($response, $limit, $allowance - 1, (int) (($limit - $allowance) * $window / $limit)); } }