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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Lukas Reschke <lukas@statuscode.ch>
* @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\DAV\Connector\Sabre;
use OCP\IConfig;
use Sabre\HTTP\RequestInterface;
use Sabre\DAV\ServerPlugin;
use Sabre\DAV\Exception;
/**
* Class BlockLegacyClientPlugin is used to detect old legacy sync clients and
* returns a 403 status to those clients
*
* @package OCA\DAV\Connector\Sabre
*/
class BlockLegacyClientPlugin extends ServerPlugin {
/** @var \Sabre\DAV\Server */
protected $server;
/** @var IConfig */
protected $config;
/**
* @param IConfig $config
*/
public function __construct(IConfig $config) {
$this->config = $config;
}
/**
* @param \Sabre\DAV\Server $server
* @return void
*/
public function initialize(\Sabre\DAV\Server $server) {
$this->server = $server;
$this->server->on('beforeMethod', [$this, 'beforeHandler'], 200);
}
/**
* Detects all unsupported clients and throws a \Sabre\DAV\Exception\Forbidden
* exception which will result in a 403 to them.
* @param RequestInterface $request
* @throws \Sabre\DAV\Exception\Forbidden If the client version is not supported
*/
public function beforeHandler(RequestInterface $request) {
$userAgent = $request->getHeader('User-Agent');
if($userAgent === null) {
return;
}
$minimumSupportedDesktopVersion = $this->config->getSystemValue('minimum.supported.desktop.version', '2.0.0');
// Match on the mirall version which is in scheme "Mozilla/5.0 (%1) mirall/%2" or
// "mirall/%1" for older releases
preg_match("/(?:mirall\\/)([\d.]+)/i", $userAgent, $versionMatches);
if(isset($versionMatches[1]) &&
version_compare($versionMatches[1], $minimumSupportedDesktopVersion) === -1) {
throw new \Sabre\DAV\Exception\Forbidden('Unsupported client version.');
}
}
}
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