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<?php |
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/** |
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* @copyright Copyright (c) 2017 Lukas Reschke <[email protected]> |
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* |
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* @license GNU AGPL version 3 or any later version |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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namespace OC\Security\RateLimiting\Backend; |
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use OCP\AppFramework\Utility\ITimeFactory; |
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use OCP\ICache; |
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use OCP\ICacheFactory; |
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/** |
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* Class MemoryCache uses the configured distributed memory cache for storing |
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* rate limiting data. |
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* |
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* @package OC\Security\RateLimiting\Backend |
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*/ |
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class MemoryCache implements IBackend { |
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/** @var ICache */ |
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private $cache; |
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/** @var ITimeFactory */ |
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private $timeFactory; |
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/** |
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* @param ICacheFactory $cacheFactory |
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* @param ITimeFactory $timeFactory |
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*/ |
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public function __construct(ICacheFactory $cacheFactory, |
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ITimeFactory $timeFactory) { |
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$this->cache = $cacheFactory->create(__CLASS__); |
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$this->timeFactory = $timeFactory; |
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} |
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/** |
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* @param string $methodIdentifier |
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* @param string $userIdentifier |
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* @return string |
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*/ |
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private function hash($methodIdentifier, |
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$userIdentifier) { |
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return hash('sha512', $methodIdentifier . $userIdentifier); |
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} |
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/** |
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* @param string $identifier |
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* @return array |
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*/ |
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private function getExistingAttempts($identifier) { |
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$cachedAttempts = json_decode($this->cache->get($identifier), true); |
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if(is_array($cachedAttempts)) { |
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return $cachedAttempts; |
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} |
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return []; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getAttempts($methodIdentifier, |
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$userIdentifier, |
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$seconds) { |
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$identifier = $this->hash($methodIdentifier, $userIdentifier); |
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$existingAttempts = $this->getExistingAttempts($identifier); |
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$count = 0; |
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$currentTime = $this->timeFactory->getTime(); |
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/** @var array $existingAttempts */ |
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foreach ($existingAttempts as $attempt) { |
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if(($attempt + $seconds) > $currentTime) { |
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$count++; |
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} |
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} |
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return $count; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function registerAttempt($methodIdentifier, |
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$userIdentifier, |
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$period) { |
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$identifier = $this->hash($methodIdentifier, $userIdentifier); |
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$existingAttempts = $this->getExistingAttempts($identifier); |
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$currentTime = $this->timeFactory->getTime(); |
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// Unset all attempts older than $period |
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foreach ($existingAttempts as $key => $attempt) { |
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if(($attempt + $period) < $currentTime) { |
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unset($existingAttempts[$key]); |
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} |
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} |
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$existingAttempts = array_values($existingAttempts); |
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// Store the new attempt |
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$existingAttempts[] = (string)$currentTime; |
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$this->cache->set($identifier, json_encode($existingAttempts)); |
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} |
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} |
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nextcloud /
server
