<?php
/* Copyright (C) 2018	Destailleur Laurent	<eldy@users.sourceforge.net>
 * Copyright (C) 2019	Regis Houssin		<regis.houssin@inodbox.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 *
 * You can test with the WebDav client cadaver:
 * cadaver http://myurl/dav/fileserver.php
 */

/**
 *      \file       htdocs/dav/fileserver.php
 *      \ingroup    dav
 *      \brief      Server DAV
 */

if (!defined('NOTOKENRENEWAL')) {
	define('NOTOKENRENEWAL', '1');
}
if (!defined('NOREQUIREMENU')) {
	define('NOREQUIREMENU', '1'); // If there is no menu to show
}
if (!defined('NOREQUIREHTML')) {
	define('NOREQUIREHTML', '1'); // If we don't need to load the html.form.class.php
}
if (!defined('NOREQUIREAJAX')) {
	define('NOREQUIREAJAX', '1');
}
if (!defined('NOLOGIN')) {
	define("NOLOGIN", 1); // This means this output page does not require to be logged.
}
if (!defined('NOCSRFCHECK')) {
	define("NOCSRFCHECK", 1); // We accept to go on this page from external web site.
}

require "../main.inc.php";
require_once DOL_DOCUMENT_ROOT.'/core/lib/security2.lib.php';
require_once DOL_DOCUMENT_ROOT.'/core/class/html.formcompany.class.php';
require_once DOL_DOCUMENT_ROOT.'/dav/dav.class.php';
require_once DOL_DOCUMENT_ROOT.'/dav/dav.lib.php';
require_once DOL_DOCUMENT_ROOT.'/includes/sabre/autoload.php';


$user = new User($db);
if (isset($_SERVER['PHP_AUTH_USER']) && $_SERVER['PHP_AUTH_USER'] != '') {
	$user->fetch('', $_SERVER['PHP_AUTH_USER']);
	$user->getrights();
}

// Load translation files required by the page
$langs->loadLangs(array("main", "other"));


if (empty($conf->dav->enabled)) {
	accessforbidden();
}


// Restrict API to some IPs
if (!empty($conf->global->DAV_RESTRICT_ON_IP)) {
	$allowedip = explode(' ', $conf->global->DAV_RESTRICT_ON_IP);
	$ipremote = getUserRemoteIP();
	if (!in_array($ipremote, $allowedip)) {
		dol_syslog('Remote ip is '.$ipremote.', not into list '.$conf->global->DAV_RESTRICT_ON_IP);
		print 'DAV not allowed from the IP '.$ipremote;
		header('HTTP/1.1 503 DAV not allowed from your IP '.$ipremote);
		//print $conf->global->DAV_RESTRICT_ON_IP;
		exit(0);
	}
}


$entity = (GETPOST('entity', 'int') ? GETPOST('entity', 'int') : (!empty($conf->entity) ? $conf->entity : 1));

// settings
$publicDir = $conf->dav->multidir_output[$entity].'/public';
$privateDir = $conf->dav->multidir_output[$entity].'/private';
$ecmDir = $conf->ecm->multidir_output[$entity];
$tmpDir = $conf->dav->multidir_output[$entity]; // We need root dir, not a dir that can be deleted
//var_dump($tmpDir);mkdir($tmpDir);exit;


// Authentication callback function
$authBackend = new \Sabre\DAV\Auth\Backend\BasicCallBack(function ($username, $password) {
	global $user;
	global $conf;
	global $dolibarr_main_authentication, $dolibarr_auto_user;

	if (empty($user->login)) {
		dol_syslog("Failed to authenticate to DAV, login is not provided", LOG_WARNING);
		return false;
	}
	if ($user->socid > 0) {
		dol_syslog("Failed to authenticate to DAV, use is an external user", LOG_WARNING);
		return false;
	}
	if ($user->login != $username) {
		dol_syslog("Failed to authenticate to DAV, login does not match the login of loaded user", LOG_WARNING);
		return false;
	}

	// Authentication mode
	if (empty($dolibarr_main_authentication)) {
		$dolibarr_main_authentication = 'dolibarr';
	}

	// Authentication mode: forceuser
	if ($dolibarr_main_authentication == 'forceuser') {
		if (empty($dolibarr_auto_user)) {
			$dolibarr_auto_user = 'auto';
		}
		if ($dolibarr_auto_user != $username) {
			dol_syslog("Warning: your instance is set to use the automatic forced login '".$dolibarr_auto_user."' that is not the requested login. DAV usage is forbidden in this mode.");
			return false;
		}
	}

	$authmode = explode(',', $dolibarr_main_authentication);
	$entity = (GETPOST('entity', 'int') ? GETPOST('entity', 'int') : (!empty($conf->entity) ? $conf->entity : 1));

	if (checkLoginPassEntity($username, $password, $entity, $authmode, 'dav') != $username) {
		return false;
	}

	return true;
});

$authBackend->setRealm(constant('DOL_APPLICATION_TITLE'));


/*
 * Actions and View
 */

// Create the root node
// Setting up the directory tree //
$nodes = array();

// Enable directories and features according to DAV setup
// Public dir
if (!empty($conf->global->DAV_ALLOW_PUBLIC_DIR)) {
	$nodes[] = new \Sabre\DAV\FS\Directory($publicDir);
}
// Private dir
$nodes[] = new \Sabre\DAV\FS\Directory($privateDir);
// ECM dir
if (!empty($conf->ecm->enabled) && !empty($conf->global->DAV_ALLOW_ECM_DIR)) {
	$nodes[] = new \Sabre\DAV\FS\Directory($ecmDir);
}


// Principals Backend
//$principalBackend = new \Sabre\DAVACL\PrincipalBackend\Dolibarr($user,$db);
// /principals
//$nodes[] = new \Sabre\DAVACL\PrincipalCollection($principalBackend);
// CardDav & CalDav Backend
//$carddavBackend   = new \Sabre\CardDAV\Backend\Dolibarr($user,$db,$langs);
//$caldavBackend    = new \Sabre\CalDAV\Backend\Dolibarr($user,$db,$langs, $cdavLib);
// /addressbook
//$nodes[] = new \Sabre\CardDAV\AddressBookRoot($principalBackend, $carddavBackend);
// /calendars
//$nodes[] = new \Sabre\CalDAV\CalendarRoot($principalBackend, $caldavBackend);


// The rootnode needs in turn to be passed to the server class
$server = new \Sabre\DAV\Server($nodes);

// If you want to run the SabreDAV server in a custom location (using mod_rewrite for instance)
// You can override the baseUri here.
$baseUri = DOL_URL_ROOT.'/dav/fileserver.php/';
if (isset($baseUri)) {
	$server->setBaseUri($baseUri);
}

// Add authentication function
if ((empty($conf->global->DAV_ALLOW_PUBLIC_DIR)
	|| !preg_match('/'.preg_quote(DOL_URL_ROOT.'/dav/fileserver.php/public', '/').'/', $_SERVER["PHP_SELF"]))
	&& !preg_match('/^sabreAction=asset&assetName=[a-zA-Z0-9%\-\/]+\.(png|css|woff|ico|ttf)$/', $_SERVER["QUERY_STRING"])	// URL for Sabre browser resources
	) {
	//var_dump($_SERVER["QUERY_STRING"]);exit;
	$server->addPlugin(new \Sabre\DAV\Auth\Plugin($authBackend));
}
// Support for LOCK and UNLOCK
$lockBackend = new \Sabre\DAV\Locks\Backend\File($tmpDir.'/.locksdb');
$lockPlugin = new \Sabre\DAV\Locks\Plugin($lockBackend);
$server->addPlugin($lockPlugin);

// Support for html frontend
if (empty($conf->global->DAV_DISABLE_BROWSER)) {
	$browser = new \Sabre\DAV\Browser\Plugin();
	$server->addPlugin($browser);
}

// Automatically guess (some) contenttypes, based on extension
//$server->addPlugin(new \Sabre\DAV\Browser\GuessContentType());

//$server->addPlugin(new \Sabre\CardDAV\Plugin());
//$server->addPlugin(new \Sabre\CalDAV\Plugin());
//$server->addPlugin(new \Sabre\DAVACL\Plugin());

// Temporary file filter
/*$tempFF = new \Sabre\DAV\TemporaryFileFilterPlugin($tmpDir);
$server->addPlugin($tempFF);
*/

// And off we go!
$server->exec();

if (is_object($db)) {
	$db->close();
}