128 lines
3.4 KiB
PHP
128 lines
3.4 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* @copyright Copyright (c) 2017 Lukas Reschke <lukas@statuscode.ch>
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*
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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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 = $cacheFactory->createDistributed(__CLASS__);
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$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(string $methodIdentifier,
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string $userIdentifier): string {
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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(string $identifier): array {
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$cachedAttempts = $this->cache->get($identifier);
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if ($cachedAttempts === null) {
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return [];
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}
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$cachedAttempts = json_decode($cachedAttempts, true);
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if(\is_array($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(string $methodIdentifier,
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string $userIdentifier,
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int $seconds): int {
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$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(string $methodIdentifier,
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string $userIdentifier,
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int $period) {
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$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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