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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OCA\DAV\Connector\Sabre;
use OCA\Theming\ThemingDefaults;
use OCP\IConfig;
use OCP\IRequest;
use Sabre\DAV\Server;
use Sabre\DAV\ServerPlugin;
use Sabre\HTTP\RequestInterface;
/**
* 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 {
protected ?Server $server = null;
public function __construct(
private IConfig $config,
private ThemingDefaults $themingDefaults,
) {
}
/**
* @return void
*/
public function initialize(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->getSystemValueString('minimum.supported.desktop.version', '2.3.0');
$maximumSupportedDesktopVersion = $this->config->getSystemValueString('maximum.supported.desktop.version', '99.99.99');
// Check if the client is a desktop client
preg_match(IRequest::USER_AGENT_CLIENT_DESKTOP, $userAgent, $versionMatches);
// If the client is a desktop client and the version is too old, block it
if (isset($versionMatches[1]) && version_compare($versionMatches[1], $minimumSupportedDesktopVersion) === -1) {
$customClientDesktopLink = htmlspecialchars($this->themingDefaults->getSyncClientUrl());
$minimumSupportedDesktopVersion = htmlspecialchars($minimumSupportedDesktopVersion);
throw new \Sabre\DAV\Exception\Forbidden("This version of the client is unsupported. Upgrade to <a href=\"$customClientDesktopLink\">version $minimumSupportedDesktopVersion or later</a>.");
}
// If the client is a desktop client and the version is too new, block it
if (isset($versionMatches[1]) && version_compare($versionMatches[1], $maximumSupportedDesktopVersion) === 1) {
$customClientDesktopLink = htmlspecialchars($this->themingDefaults->getSyncClientUrl());
$maximumSupportedDesktopVersion = htmlspecialchars($maximumSupportedDesktopVersion);
throw new \Sabre\DAV\Exception\Forbidden("This version of the client is unsupported. Downgrade to <a href=\"$customClientDesktopLink\">version $maximumSupportedDesktopVersion or earlier</a>.");
}
}
}
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