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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
*/
require_once __DIR__ . '/lib/versioncheck.php';
use OCA\DAV\Connector\Sabre\ExceptionLoggerPlugin;
use OCP\App\IAppManager;
use Psr\Log\LoggerInterface;
use Sabre\DAV\Exception\ServiceUnavailable;
use Sabre\DAV\Server;
/**
* Class RemoteException
* Dummy exception class to be use locally to identify certain conditions
* Will not be logged to avoid DoS
*/
class RemoteException extends \Exception {
}
function handleException(Exception|Error $e): void {
try {
$request = \OC::$server->getRequest();
// in case the request content type is text/xml - we assume it's a WebDAV request
$isXmlContentType = strpos($request->getHeader('Content-Type'), 'text/xml');
if ($isXmlContentType === 0) {
// fire up a simple server to properly process the exception
$server = new Server();
if (!($e instanceof RemoteException)) {
// we shall not log on RemoteException
$server->addPlugin(new ExceptionLoggerPlugin('webdav', \OC::$server->get(LoggerInterface::class)));
}
$server->on('beforeMethod:*', function () use ($e) {
if ($e instanceof RemoteException) {
switch ($e->getCode()) {
case 503:
throw new ServiceUnavailable($e->getMessage());
case 404:
throw new \Sabre\DAV\Exception\NotFound($e->getMessage());
}
}
$class = get_class($e);
$msg = $e->getMessage();
throw new ServiceUnavailable("$class: $msg");
});
$server->exec();
} else {
$statusCode = 500;
if ($e instanceof \OC\ServiceUnavailableException) {
$statusCode = 503;
}
if ($e instanceof RemoteException) {
// we shall not log on RemoteException
OC_Template::printErrorPage($e->getMessage(), '', $e->getCode());
} else {
\OC::$server->get(LoggerInterface::class)->error($e->getMessage(), ['app' => 'remote','exception' => $e]);
OC_Template::printExceptionErrorPage($e, $statusCode);
}
}
} catch (\Exception $e) {
OC_Template::printExceptionErrorPage($e, 500);
}
}
/**
* @param $service
* @return string
*/
function resolveService($service) {
$services = [
'webdav' => 'dav/appinfo/v1/webdav.php',
'dav' => 'dav/appinfo/v2/remote.php',
'caldav' => 'dav/appinfo/v1/caldav.php',
'calendar' => 'dav/appinfo/v1/caldav.php',
'carddav' => 'dav/appinfo/v1/carddav.php',
'contacts' => 'dav/appinfo/v1/carddav.php',
'files' => 'dav/appinfo/v1/webdav.php',
'direct' => 'dav/appinfo/v2/direct.php',
];
if (isset($services[$service])) {
return $services[$service];
}
return \OC::$server->getConfig()->getAppValue('core', 'remote_' . $service);
}
try {
require_once __DIR__ . '/lib/base.php';
// All resources served via the DAV endpoint should have the strictest possible
// policy. Exempted from this is the SabreDAV browser plugin which overwrites
// this policy with a softer one if debug mode is enabled.
header("Content-Security-Policy: default-src 'none';");
if (\OCP\Util::needUpgrade()) {
// since the behavior of apps or remotes are unpredictable during
// an upgrade, return a 503 directly
throw new RemoteException('Service unavailable', 503);
}
$request = \OC::$server->getRequest();
$pathInfo = $request->getPathInfo();
if ($pathInfo === false || $pathInfo === '') {
throw new RemoteException('Path not found', 404);
}
if (!$pos = strpos($pathInfo, '/', 1)) {
$pos = strlen($pathInfo);
}
$service = substr($pathInfo, 1, $pos - 1);
$file = resolveService($service);
if (is_null($file)) {
throw new RemoteException('Path not found', 404);
}
$file = ltrim($file, '/');
$parts = explode('/', $file, 2);
$app = $parts[0];
// Load all required applications
\OC::$REQUESTEDAPP = $app;
$appManager = \OCP\Server::get(IAppManager::class);
$appManager->loadApps(['authentication']);
$appManager->loadApps(['extended_authentication']);
$appManager->loadApps(['filesystem', 'logging']);
switch ($app) {
case 'core':
$file = OC::$SERVERROOT . '/' . $file;
break;
default:
if (!$appManager->isInstalled($app)) {
throw new RemoteException('App not installed: ' . $app);
}
$appManager->loadApp($app);
$file = $appManager->getAppPath($app) . '/' . ($parts[1] ?? '');
break;
}
$baseuri = OC::$WEBROOT . '/remote.php/' . $service . '/';
require_once $file;
} catch (Exception $ex) {
handleException($ex);
} catch (Error $e) {
handleException($e);
}
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