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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Security\Bruteforce\Backend;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\ICache;
use OCP\ICacheFactory;
class MemoryCacheBackend implements IBackend {
private ICache $cache;
public function __construct(
ICacheFactory $cacheFactory,
private ITimeFactory $timeFactory,
) {
$this->cache = $cacheFactory->createDistributed(__CLASS__);
}
private function hash(
null|string|array $data,
): ?string {
if ($data === null) {
return null;
}
if (!is_string($data)) {
$data = json_encode($data);
}
return hash('sha1', $data);
}
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 $ipSubnet,
int $maxAgeTimestamp,
?string $action = null,
?array $metadata = null,
): int {
$identifier = $this->hash($ipSubnet);
$actionHash = $this->hash($action);
$metadataHash = $this->hash($metadata);
$existingAttempts = $this->getExistingAttempts($identifier);
$count = 0;
foreach ($existingAttempts as $info) {
[$occurredTime, $attemptAction, $attemptMetadata] = explode('#', $info, 3);
if ($action === null || $attemptAction === $actionHash) {
if ($metadata === null || $attemptMetadata === $metadataHash) {
if ($occurredTime > $maxAgeTimestamp) {
$count++;
}
}
}
}
return $count;
}
/**
* {@inheritDoc}
*/
public function resetAttempts(
string $ipSubnet,
?string $action = null,
?array $metadata = null,
): void {
$identifier = $this->hash($ipSubnet);
if ($action === null) {
$this->cache->remove($identifier);
} else {
$actionHash = $this->hash($action);
$metadataHash = $this->hash($metadata);
$existingAttempts = $this->getExistingAttempts($identifier);
$maxAgeTimestamp = $this->timeFactory->getTime() - 12 * 3600;
foreach ($existingAttempts as $key => $info) {
[$occurredTime, $attemptAction, $attemptMetadata] = explode('#', $info, 3);
if ($attemptAction === $actionHash) {
if ($metadata === null || $attemptMetadata === $metadataHash) {
unset($existingAttempts[$key]);
} elseif ($occurredTime < $maxAgeTimestamp) {
unset($existingAttempts[$key]);
}
}
}
if (!empty($existingAttempts)) {
$this->cache->set($identifier, json_encode($existingAttempts), 12 * 3600);
} else {
$this->cache->remove($identifier);
}
}
}
/**
* {@inheritDoc}
*/
public function registerAttempt(
string $ip,
string $ipSubnet,
int $timestamp,
string $action,
array $metadata = [],
): void {
$identifier = $this->hash($ipSubnet);
$existingAttempts = $this->getExistingAttempts($identifier);
$maxAgeTimestamp = $this->timeFactory->getTime() - 12 * 3600;
// Unset all attempts that are already expired
foreach ($existingAttempts as $key => $info) {
[$occurredTime,] = explode('#', $info, 3);
if ($occurredTime < $maxAgeTimestamp) {
unset($existingAttempts[$key]);
}
}
$existingAttempts = array_values($existingAttempts);
// Store the new attempt
$existingAttempts[] = $timestamp . '#' . $this->hash($action) . '#' . $this->hash($metadata);
$this->cache->set($identifier, json_encode($existingAttempts), 12 * 3600);
}
}
|
