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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Christopher Schäpers <kondou@ts.unde.re>
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Joas Schilling <coding@schilljs.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Roger Szabo <roger.szabo@web.de>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\User_LDAP;
use OCA\User_LDAP\Mapping\GroupMapping;
use OCA\User_LDAP\Mapping\UserMapping;
use OCP\ICache;
use OCP\Server;
abstract class Proxy {
/** @var array<string,Access> */
private static array $accesses = [];
private ILDAPWrapper $ldap;
private ?bool $isSingleBackend = null;
private ?ICache $cache = null;
private AccessFactory $accessFactory;
public function __construct(
ILDAPWrapper $ldap,
AccessFactory $accessFactory
) {
$this->ldap = $ldap;
$this->accessFactory = $accessFactory;
$memcache = \OC::$server->getMemCacheFactory();
if ($memcache->isAvailable()) {
$this->cache = $memcache->createDistributed();
}
}
private function addAccess(string $configPrefix): void {
$userMap = Server::get(UserMapping::class);
$groupMap = Server::get(GroupMapping::class);
$connector = new Connection($this->ldap, $configPrefix);
$access = $this->accessFactory->get($connector);
$access->setUserMapper($userMap);
$access->setGroupMapper($groupMap);
self::$accesses[$configPrefix] = $access;
}
protected function getAccess(string $configPrefix): Access {
if (!isset(self::$accesses[$configPrefix])) {
$this->addAccess($configPrefix);
}
return self::$accesses[$configPrefix];
}
/**
* @param string $uid
* @return string
*/
protected function getUserCacheKey($uid) {
return 'user-' . $uid . '-lastSeenOn';
}
/**
* @param string $gid
* @return string
*/
protected function getGroupCacheKey($gid) {
return 'group-' . $gid . '-lastSeenOn';
}
/**
* @param string $id
* @param string $method
* @param array $parameters
* @param bool $passOnWhen
* @return mixed
*/
abstract protected function callOnLastSeenOn($id, $method, $parameters, $passOnWhen);
/**
* @param string $id
* @param string $method
* @param array $parameters
* @return mixed
*/
abstract protected function walkBackends($id, $method, $parameters);
/**
* @param string $id
* @return Access
*/
abstract public function getLDAPAccess($id);
abstract protected function activeBackends(): int;
protected function isSingleBackend(): bool {
if ($this->isSingleBackend === null) {
$this->isSingleBackend = $this->activeBackends() === 1;
}
return $this->isSingleBackend;
}
/**
* Takes care of the request to the User backend
*
* @param string $id
* @param string $method string, the method of the user backend that shall be called
* @param array $parameters an array of parameters to be passed
* @param bool $passOnWhen
* @return mixed, the result of the specified method
*/
protected function handleRequest($id, $method, $parameters, $passOnWhen = false) {
if (!$this->isSingleBackend()) {
$result = $this->callOnLastSeenOn($id, $method, $parameters, $passOnWhen);
}
if (!isset($result) || $result === $passOnWhen) {
$result = $this->walkBackends($id, $method, $parameters);
}
return $result;
}
/**
* @param string|null $key
* @return string
*/
private function getCacheKey($key) {
$prefix = 'LDAP-Proxy-';
if ($key === null) {
return $prefix;
}
return $prefix . hash('sha256', $key);
}
/**
* @param string $key
* @return mixed|null
*/
public function getFromCache($key) {
if ($this->cache === null) {
return null;
}
$key = $this->getCacheKey($key);
$value = $this->cache->get($key);
if ($value === null) {
return null;
}
return json_decode(base64_decode($value));
}
/**
* @param string $key
* @param mixed $value
*/
public function writeToCache($key, $value) {
if ($this->cache === null) {
return;
}
$key = $this->getCacheKey($key);
$value = base64_encode(json_encode($value));
$this->cache->set($key, $value, 2592000);
}
public function clearCache() {
if ($this->cache === null) {
return;
}
$this->cache->clear($this->getCacheKey(null));
}
}
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