/**
* 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));
}
}
