125 lines
3.3 KiB
PHP
125 lines
3.3 KiB
PHP
<?php
|
|
declare(strict_types=1);
|
|
/**
|
|
* @copyright Copyright (c) 2017 Lukas Reschke <lukas@statuscode.ch>
|
|
*
|
|
* @author Lukas Reschke <lukas@statuscode.ch>
|
|
*
|
|
* @license GNU AGPL version 3 or any later version
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as
|
|
* published by the Free Software Foundation, either version 3 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
namespace OC\Security\RateLimiting\Backend;
|
|
|
|
use OCP\AppFramework\Utility\ITimeFactory;
|
|
use OCP\ICache;
|
|
use OCP\ICacheFactory;
|
|
|
|
/**
|
|
* Class MemoryCache uses the configured distributed memory cache for storing
|
|
* rate limiting data.
|
|
*
|
|
* @package OC\Security\RateLimiting\Backend
|
|
*/
|
|
class MemoryCache implements IBackend {
|
|
/** @var ICache */
|
|
private $cache;
|
|
/** @var ITimeFactory */
|
|
private $timeFactory;
|
|
|
|
/**
|
|
* @param ICacheFactory $cacheFactory
|
|
* @param ITimeFactory $timeFactory
|
|
*/
|
|
public function __construct(ICacheFactory $cacheFactory,
|
|
ITimeFactory $timeFactory) {
|
|
$this->cache = $cacheFactory->createDistributed(__CLASS__);
|
|
$this->timeFactory = $timeFactory;
|
|
}
|
|
|
|
/**
|
|
* @param string $methodIdentifier
|
|
* @param string $userIdentifier
|
|
* @return string
|
|
*/
|
|
private function hash(string $methodIdentifier,
|
|
string $userIdentifier): string {
|
|
return hash('sha512', $methodIdentifier . $userIdentifier);
|
|
}
|
|
|
|
/**
|
|
* @param string $identifier
|
|
* @return array
|
|
*/
|
|
private function getExistingAttempts(string $identifier): array {
|
|
$cachedAttempts = $this->cache->get($identifier);
|
|
if ($cachedAttempts === null) {
|
|
return [];
|
|
}
|
|
|
|
$cachedAttempts = json_decode($cachedAttempts, true);
|
|
if(\is_array($cachedAttempts)) {
|
|
return $cachedAttempts;
|
|
}
|
|
|
|
return [];
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function getAttempts(string $methodIdentifier,
|
|
string $userIdentifier,
|
|
int $seconds): int {
|
|
$identifier = $this->hash($methodIdentifier, $userIdentifier);
|
|
$existingAttempts = $this->getExistingAttempts($identifier);
|
|
|
|
$count = 0;
|
|
$currentTime = $this->timeFactory->getTime();
|
|
/** @var array $existingAttempts */
|
|
foreach ($existingAttempts as $attempt) {
|
|
if(($attempt + $seconds) > $currentTime) {
|
|
$count++;
|
|
}
|
|
}
|
|
|
|
return $count;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function registerAttempt(string $methodIdentifier,
|
|
string $userIdentifier,
|
|
int $period) {
|
|
$identifier = $this->hash($methodIdentifier, $userIdentifier);
|
|
$existingAttempts = $this->getExistingAttempts($identifier);
|
|
$currentTime = $this->timeFactory->getTime();
|
|
|
|
// Unset all attempts older than $period
|
|
foreach ($existingAttempts as $key => $attempt) {
|
|
if(($attempt + $period) < $currentTime) {
|
|
unset($existingAttempts[$key]);
|
|
}
|
|
}
|
|
$existingAttempts = array_values($existingAttempts);
|
|
|
|
// Store the new attempt
|
|
$existingAttempts[] = (string)$currentTime;
|
|
$this->cache->set($identifier, json_encode($existingAttempts));
|
|
}
|
|
}
|