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<?php
namespace Illuminate\Cache;
use Carbon\Carbon;
use Illuminate\Contracts\Cache\Repository as Cache;
class RateLimiter
{
/**
* The cache store implementation.
*
* @var \Illuminate\Contracts\Cache\Repository
*/
protected $cache;
/**
* Create a new rate limiter instance.
*
* @param \Illuminate\Contracts\Cache\Repository $cache
* @return void
*/
public function __construct(Cache $cache)
{
$this->cache = $cache;
}
/**
* Determine if the given key has been "accessed" too many times.
*
* @param string $key
* @param int $maxAttempts
* @param float|int $decayMinutes
* @return bool
*/
public function tooManyAttempts($key, $maxAttempts, $decayMinutes = 1)
{
if ($this->cache->has($key.':lockout')) {
return true;
}
if ($this->attempts($key) >= $maxAttempts) {
$this->lockout($key, $decayMinutes);
$this->resetAttempts($key);
return true;
}
return false;
}
/**
* Add the lockout key to the cache.
*
* @param string $key
* @param int $decayMinutes
* @return void
*/
protected function lockout($key, $decayMinutes)
{
$this->cache->add(
$key.':lockout', Carbon::now()->getTimestamp() + ($decayMinutes * 60), $decayMinutes
);
}
/**
* Increment the counter for a given key for a given decay time.
*
* @param string $key
* @param float|int $decayMinutes
* @return int
*/
public function hit($key, $decayMinutes = 1)
{
$added = $this->cache->add($key, 0, $decayMinutes);
$hits = (int) $this->cache->increment($key);
if (! $added && $hits == 1) {
$this->cache->put($key, 1, $decayMinutes);
}
return $hits;
}
/**
* Get the number of attempts for the given key.
*
* @param string $key
* @return mixed
*/
public function attempts($key)
{
return $this->cache->get($key, 0);
}
/**
* Reset the number of attempts for the given key.
*
* @param string $key
* @return mixed
*/
public function resetAttempts($key)
{
return $this->cache->forget($key);
}
/**
* Get the number of retries left for the given key.
*
* @param string $key
* @param int $maxAttempts
* @return int
*/
public function retriesLeft($key, $maxAttempts)
{
$attempts = $this->attempts($key);
return $maxAttempts - $attempts;
}
/**
* Clear the hits and lockout for the given key.
*
* @param string $key
* @return void
*/
public function clear($key)
{
$this->resetAttempts($key);
$this->cache->forget($key.':lockout');
}
/**
* Get the number of seconds until the "key" is accessible again.
*
* @param string $key
* @return int
*/
public function availableIn($key)
{
return $this->cache->get($key.':lockout') - Carbon::now()->getTimestamp();
}
}