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<?php |
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namespace PhalconExt\Http\Middleware; |
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use Phalcon\Http\Request; |
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use Phalcon\Http\Response; |
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use PhalconExt\Http\BaseMiddleware; |
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/** |
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* A request throttling middleware. |
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* |
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* @author Jitendra Adhikari <[email protected]> |
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* @license MIT |
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* |
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* @link https://github.com/adhocore/phalcon-ext |
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*/ |
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class Throttle extends BaseMiddleware |
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{ |
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/** @var string */ |
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protected $redis; |
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protected $configKey = 'throttle'; |
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protected $retryKey = ''; |
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/** |
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* Get retry key that causes throttling. |
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* |
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* @return string |
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*/ |
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public function getRetryKey(): string |
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{ |
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return $this->retryKey; |
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} |
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/** |
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* Handle the throttle. |
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* |
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* @param Request $request |
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* @param Response $response |
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* |
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* @return bool |
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*/ |
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public function before(Request $request, Response $response): bool |
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{ |
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if ('' === $this->retryKey = $this->findRetryKey($request)) { |
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return true; |
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} |
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$this->disableView(); |
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$after = \ceil($this->di('redis')->getTtl($this->retryKey) / 60); |
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$response |
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->setContent("Too many requests. Try again in $after min.") |
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->setHeader('Retry-After', $after) |
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->setStatusCode(429) |
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->send(); |
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return false; |
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} |
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/** |
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* Find the redis key that contains hits counter which has exceeded threshold for throttle. |
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* |
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* @param Request $request |
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* |
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* @return string |
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*/ |
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protected function findRetryKey(Request $request): string |
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{ |
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$retryKey = ''; |
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$redis = $this->di('redis'); |
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$baseKey = $this->getKey($request); |
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foreach ($this->config['maxHits'] as $minutes => $maxHits) { |
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$key = "$baseKey:$minutes"; |
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if ($this->shouldThrottle($redis, $key, $minutes, $maxHits)) { |
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$retryKey = $key; |
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} |
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} |
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return $retryKey; |
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} |
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/** |
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* Get the unique key for this client. |
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* |
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* @param Request $request |
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* |
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* @return string |
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*/ |
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protected function getKey(Request $request): string |
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{ |
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$key = $request->getClientAddress(true); |
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if ($this->config['checkUserAgent'] ?? false) { |
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$key .= ':' . \md5($request->getUserAgent()); |
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} |
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return ($this->config['prefix'] ?? '') . $key; |
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} |
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/** |
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* Check if we should throttle. Update hits counter if not. |
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* |
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* @param Request $request |
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* |
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* @return bool |
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*/ |
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protected function shouldThrottle($redis, string $key, int $minutes, int $maxHits): bool |
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{ |
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$hits = $redis->get($key) ?: 0; |
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$ttl = $hits ? $redis->getTtl($key) : $minutes * 60; |
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if ($hits >= $maxHits) { |
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return true; |
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} |
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$redis->save($key, $hits + 1, $ttl); |
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return false; |
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} |
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} |
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adhocore /
phalcon-ext
