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<?php
namespace Illuminate\Routing\Middleware;
use Closure;
use Illuminate\Cache\RateLimiter;
use Illuminate\Contracts\Redis\Factory as Redis;
use Illuminate\Redis\Limiters\DurationLimiter;
class ThrottleRequestsWithRedis extends ThrottleRequests
{
/**
* The Redis factory implementation.
*
* @var \Illuminate\Contracts\Redis\Factory
*/
protected $redis;
/**
* The timestamp of the end of the current duration by key.
*
* @var array
*/
public $decaysAt = [];
/**
* The number of remaining slots by key.
*
* @var array
*/
public $remaining = [];
/**
* Create a new request throttler.
*
* @param \Illuminate\Cache\RateLimiter $limiter
* @param \Illuminate\Contracts\Redis\Factory $redis
* @return void
*/
public function __construct(RateLimiter $limiter, Redis $redis)
{
parent::__construct($limiter);
$this->redis = $redis;
}
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @param array $limits
* @return \Symfony\Component\HttpFoundation\Response
*
* @throws \Illuminate\Http\Exceptions\ThrottleRequestsException
*/
protected function handleRequest($request, Closure $next, array $limits)
{
foreach ($limits as $limit) {
if ($this->tooManyAttempts($limit->key, $limit->maxAttempts, $limit->decayMinutes)) {
throw $this->buildException($request, $limit->key, $limit->maxAttempts, $limit->responseCallback);
}
}
$response = $next($request);
foreach ($limits as $limit) {
$response = $this->addHeaders(
$response,
$limit->maxAttempts,
$this->calculateRemainingAttempts($limit->key, $limit->maxAttempts)
);
}
return $response;
}
/**
* Determine if the given key has been "accessed" too many times.
*
* @param string $key
* @param int $maxAttempts
* @param int $decayMinutes
* @return mixed
*/
protected function tooManyAttempts($key, $maxAttempts, $decayMinutes)
{
$limiter = new DurationLimiter(
$this->redis, $key, $maxAttempts, $decayMinutes * 60
);
return tap(! $limiter->acquire(), function () use ($key, $limiter) {
[$this->decaysAt[$key], $this->remaining[$key]] = [
$limiter->decaysAt, $limiter->remaining,
];
});
}
/**
* Calculate the number of remaining attempts.
*
* @param string $key
* @param int $maxAttempts
* @param int|null $retryAfter
* @return int
*/
protected function calculateRemainingAttempts($key, $maxAttempts, $retryAfter = null)
{
return is_null($retryAfter) ? $this->remaining[$key] : 0;
}
/**
* Get the number of seconds until the lock is released.
*
* @param string $key
* @return int
*/
protected function getTimeUntilNextRetry($key)
{
return $this->decaysAt[$key] - $this->currentTime();
}
}