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	<?php

	/**
	* iRony, the Kolab WebDAV/CalDAV/CardDAV Server
	*
	* This is the public API to provide *DAV-based access to the Kolab Groupware backend
	*
	* @version 0.3-dev
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2013-2014, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	// define some environment variables used throughout the app and libraries
	define('KOLAB_DAV_ROOT', realpath('../'));
	define('KOLAB_DAV_VERSION', '0.3-dev');
	define('KOLAB_DAV_START', microtime(true));

	define('RCUBE_INSTALL_PATH', KOLAB_DAV_ROOT . '/');
	define('RCUBE_CONFIG_DIR', KOLAB_DAV_ROOT . '/config/');
	define('RCUBE_PLUGINS_DIR', KOLAB_DAV_ROOT . '/lib/plugins/');

	// suppress error notices
	ini_set('error_reporting', E_ALL &~ E_NOTICE &~ E_STRICT);


	/**
	* Mapping PHP errors to exceptions.
	*
	* While this is not strictly needed, it makes a lot of sense to do so. If an
	* E_NOTICE or anything appears in your code, this allows SabreDAV to intercept
	* the issue and send a proper response back to the client (HTTP/1.1 500).
	*/
	function exception_error_handler($errno, $errstr, $errfile, $errline ) {
	throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
	}
	//set_error_handler("exception_error_handler");

	// use composer's autoloader for dependencies
	$loader = require_once(KOLAB_DAV_ROOT . '/vendor/autoload.php');
	$loader->setUseIncludePath(true); // enable include_path to load PEAR classes from their default location

	// load the Roundcube framework with its autoloader
	require_once KOLAB_DAV_ROOT . '/lib/Roundcube/bootstrap.php';

	// Roundcube framework initialization
	$rcube = rcube::get_instance(rcube::INIT_WITH_DB \| rcube::INIT_WITH_PLUGINS);
	$rcube->config->load_from_file(RCUBE_CONFIG_DIR . 'dav.inc.php');

	// Load plugins
	$plugins = (array)$rcube->config->get('kolabdav_plugins', array('kolab_auth'));
	$required = array('libkolab', 'libcalendaring');

	$rcube->plugins->init($rcube);
	$rcube->plugins->load_plugins($plugins, $required);

	// enable logger
	if ($rcube->config->get('kolabdav_console') \|\| $rcube->config->get('kolabdav_user_debug')) {
	$logger = new \Kolab\Utils\DAVLogger((\Kolab\Utils\DAVLogger::CONSOLE \| $rcube->config->get('kolabdav_http_log', 0)));
	}

	// convenience function, you know it well :-)
	function console()
	{
	global $logger;

	if ($logger) {
	call_user_func_array(array($logger, 'console'), func_get_args());
	}
	}


	// Make sure this setting is turned on and reflects the root url of the *DAV server.
	$base_uri = $rcube->config->get('base_uri', slashify(substr(dirname($_SERVER['SCRIPT_FILENAME']), strlen($_SERVER['DOCUMENT_ROOT']))));

	// add filename to base URI when called without mod_rewrite (e.g. /dav/index.php/calendar)
	if (strpos($_SERVER['REQUEST_URI'], 'index.php'))
	$base_uri .= 'index.php/';

	// create the various backend instances
	$auth_backend = new \Kolab\DAV\Auth\HTTPBasic();
	$principal_backend = new \Kolab\DAVACL\PrincipalBackend();

	$services = array();
	foreach (array('CALDAV','CARDDAV','WEBDAV') as $skey) {
	if (getenv($skey))
	$services[$skey] = 1;
	}

	// no config means all services
	if (empty($services))
	$services = array('CALDAV' => 1, 'CARDDAV' => 1, 'WEBDAV' => 1);

	// add chwala directories to include path for autoloading
	if ($services['WEBDAV']) {
	$include_path = ini_get('include_path') . PATH_SEPARATOR;
	$include_path .= KOLAB_DAV_ROOT . '/lib/FileAPI' . PATH_SEPARATOR;
	$include_path .= KOLAB_DAV_ROOT . '/lib/FileAPI/kolab' . PATH_SEPARATOR;
	$include_path .= KOLAB_DAV_ROOT . '/lib/FileAPI/ext';
	set_include_path($include_path);
	}

	// Build the directory tree
	// This is an array which contains the 'top-level' directories in the WebDAV server.
	if ($services['CALDAV'] \|\| $services['CARDDAV']) {
	$nodes = array(
	new \Sabre\CalDAV\Principal\Collection($principal_backend),
	);

	if ($services['CALDAV']) {
	$caldav_backend = new \Kolab\CalDAV\CalendarBackend();
	$caldav_backend->setUserAgent($_SERVER['HTTP_USER_AGENT']);
	$nodes[] = new \Kolab\CalDAV\CalendarRootNode($principal_backend, $caldav_backend);
	}
	if ($services['CARDDAV']) {
	$carddav_backend = new \Kolab\CardDAV\ContactsBackend();
	$carddav_backend->setUserAgent($_SERVER['HTTP_USER_AGENT']);
	$nodes[] = new \Kolab\CardDAV\AddressBookRoot($principal_backend, $carddav_backend);
	}
	if ($services['WEBDAV']) {
	$nodes[] = new \Kolab\DAV\Collection(\Kolab\DAV\Collection::ROOT_DIRECTORY);
	}
	}
	// register WebDAV service as root
	else if ($services['WEBDAV']) {
	$nodes = new \Kolab\DAV\Collection('');
	}

	// the object tree needs in turn to be passed to the server class
	$server = new \Sabre\DAV\Server($nodes);
	$server->setBaseUri($base_uri);

	// connect logger
	if (is_object($logger)) {
	$server->addPlugin($logger);
	}

	// register some plugins
	$server->addPlugin(new \Sabre\DAV\Auth\Plugin($auth_backend, 'KolabDAV'));
	$server->addPlugin(new \Sabre\DAVACL\Plugin());

	if ($services['CALDAV']) {
	$caldav_plugin = new \Kolab\CalDAV\Plugin();
	$caldav_plugin->setIMipHandler(new \Kolab\CalDAV\IMip());
	$server->addPlugin($caldav_plugin);
	}

	if ($services['CARDDAV']) {
	$server->addPlugin(new \Kolab\CardDAV\Plugin());
	}

	if ($services['WEBDAV']) {
	// the lock manager is responsible for making sure users don't overwrite each others changes.
	$locks_backend = new \Kolab\DAV\Locks\Chwala(\Kolab\DAV\Collection::ROOT_DIRECTORY);
	$server->addPlugin(new \Sabre\DAV\Locks\Plugin($locks_backend));

	// intercept some of the garbage files operation systems tend to generate when mounting a WebDAV share
	$server->addPlugin(new \Kolab\DAV\TempFilesPlugin(KOLAB_DAV_ROOT . '/temp'));
	}

	// HTML UI for browser-based access (recommended only for development)
	if (getenv('DAVBROWSER')) {
	$server->addPlugin(new \Sabre\DAV\Browser\Plugin());
	}

	// log exceptions in iRony error log
	$server->subscribeEvent('exception', function($e){
	if (!($e instanceof \Sabre\DAV\Exception) \|\| $e->getHTTPCode() == 500) {
	rcube::raise_error(array(
	'code' => 500,
	'type' => 'php',
	'file' => $e->getFile(),
	'line' => $e->getLine(),
	'message' => $e->getMessage() . " (error 500)\n" . $e->getTraceAsString(),
	), true, false);
	}
	});

	// finally, process the request
	$server->exec();

	// trigger log
	$server->broadcastEvent('exit', array());

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