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	diff --git a/plugins/libkolab/lib/kolab_storage.php b/plugins/libkolab/lib/kolab_storage.php
	index 9f4791e5..65d965e8 100644
	--- a/plugins/libkolab/lib/kolab_storage.php
	+++ b/plugins/libkolab/lib/kolab_storage.php
	@@ -1,1823 +1,1824 @@
	<?php

	/**
	* Kolab storage class providing static methods to access groupware objects on a Kolab server.
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2012-2014, 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/>.
	*/

	class kolab_storage
	{
	const CTYPE_KEY = '/shared/vendor/kolab/folder-type';
	const CTYPE_KEY_PRIVATE = '/private/vendor/kolab/folder-type';
	const COLOR_KEY_SHARED = '/shared/vendor/kolab/color';
	const COLOR_KEY_PRIVATE = '/private/vendor/kolab/color';
	const NAME_KEY_SHARED = '/shared/vendor/kolab/displayname';
	const NAME_KEY_PRIVATE = '/private/vendor/kolab/displayname';
	const UID_KEY_SHARED = '/shared/vendor/kolab/uniqueid';
	const UID_KEY_CYRUS = '/shared/vendor/cmu/cyrus-imapd/uniqueid';

	const ERROR_IMAP_CONN = 1;
	const ERROR_CACHE_DB = 2;
	const ERROR_NO_PERMISSION = 3;
	const ERROR_INVALID_FOLDER = 4;

	public static $version = '3.0';
	public static $last_error;
	public static $encode_ids = false;

	private static $ready = false;
	private static $with_tempsubs = true;
	private static $subscriptions;
	private static $ldapcache = array();
	private static $ldap = array();
	private static $states;
	private static $config;
	private static $imap;


	// Default folder names
	private static $default_folders = array(
	'event' => 'Calendar',
	'contact' => 'Contacts',
	'task' => 'Tasks',
	'note' => 'Notes',
	'file' => 'Files',
	'configuration' => 'Configuration',
	'journal' => 'Journal',
	'mail.inbox' => 'INBOX',
	'mail.drafts' => 'Drafts',
	'mail.sentitems' => 'Sent',
	'mail.wastebasket' => 'Trash',
	'mail.outbox' => 'Outbox',
	'mail.junkemail' => 'Junk',
	);


	/**
	* Setup the environment needed by the libs
	*/
	public static function setup()
	{
	if (self::$ready)
	return true;

	$rcmail = rcube::get_instance();
	self::$config = $rcmail->config;
	self::$version = strval($rcmail->config->get('kolab_format_version', self::$version));
	self::$imap = $rcmail->get_storage();
	self::$ready = class_exists('kolabformat') &&
	(self::$imap->get_capability('METADATA') \|\| self::$imap->get_capability('ANNOTATEMORE') \|\| self::$imap->get_capability('ANNOTATEMORE2'));

	if (self::$ready) {
	// do nothing
	}
	else if (!class_exists('kolabformat')) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "required kolabformat module not found"
	), true);
	}
	else if (self::$imap->get_error_code()) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php', 'message' => "IMAP error"
	), true);
	}

	// adjust some configurable settings
	if ($event_scheduling_prop = $rcmail->config->get('kolab_event_scheduling_properties', null)) {
	kolab_format_event::$scheduling_properties = (array)$event_scheduling_prop;
	}
	// adjust some configurable settings
	if ($task_scheduling_prop = $rcmail->config->get('kolab_task_scheduling_properties', null)) {
	kolab_format_task::$scheduling_properties = (array)$task_scheduling_prop;
	}

	return self::$ready;
	}

	/**
	* Initializes LDAP object to resolve Kolab users
	*
	* @param string $name Name of the configuration option with LDAP config
	*/
	public static function ldap($name = 'kolab_users_directory')
	{
	self::setup();

	$config = self::$config->get($name);

	if (empty($config)) {
	$name = 'kolab_auth_addressbook';
	$config = self::$config->get($name);
	}

	if (!empty(self::$ldap[$name])) {
	return self::$ldap[$name];
	}

	if (!is_array($config)) {
	$ldap_config = (array)self::$config->get('ldap_public');
	- $config = $ldap_config[$config];
	+ $config = $ldap_config[$config] ?? null;
	}

	if (empty($config)) {
	return null;
	}

	$ldap = new kolab_ldap($config);

	// overwrite filter option
	if ($filter = self::$config->get('kolab_users_filter')) {
	self::$config->set('kolab_auth_filter', $filter);
	}

	$user_field = $user_attrib = self::$config->get('kolab_users_id_attrib');

	// Fallback to kolab_auth_login, which is not attribute, but field name
	if (!$user_field && ($user_field = self::$config->get('kolab_auth_login', 'email'))) {
	- $user_attrib = $config['fieldmap'][$user_field];
	+ $user_attrib = $config['fieldmap'][$user_field] ?? null;
	}

	if ($user_field && $user_attrib) {
	$ldap->extend_fieldmap(array($user_field => $user_attrib));
	}

	self::$ldap[$name] = $ldap;

	return $ldap;
	}

	/**
	* Get a list of storage folders for the given data type
	*
	* @param string Data type to list folders for (contact,distribution-list,event,task,note)
	* @param bool Enable to return subscribed folders only (null to use configured subscription mode)
	*
	* @return array List of Kolab_Folder objects (folder names in UTF7-IMAP)
	*/
	public static function get_folders($type, $subscribed = null)
	{
	$folders = $folderdata = array();

	if (self::setup()) {
	foreach ((array)self::list_folders('', '*', $type, $subscribed, $folderdata) as $foldername) {
	$folders[$foldername] = new kolab_storage_folder($foldername, $type, $folderdata[$foldername]);
	}
	}

	return $folders;
	}

	/**
	* Getter for the storage folder for the given type
	*
	* @param string Data type to list folders for (contact,distribution-list,event,task,note)
	* @return object kolab_storage_folder The folder object
	*/
	public static function get_default_folder($type)
	{
	if (self::setup()) {
	foreach ((array)self::list_folders('', '*', $type . '.default', false, $folderdata) as $foldername) {
	return new kolab_storage_folder($foldername, $type, $folderdata[$foldername]);
	}
	}

	return null;
	}

	/**
	* Getter for a specific storage folder
	*
	* @param string IMAP folder to access (UTF7-IMAP)
	* @param string Expected folder type
	*
	* @return object kolab_storage_folder The folder object
	*/
	public static function get_folder($folder, $type = null)
	{
	return self::setup() ? new kolab_storage_folder($folder, $type) : null;
	}

	/**
	* Getter for a single Kolab object, identified by its UID.
	* This will search all folders storing objects of the given type.
	*
	* @param string Object UID
	* @param string Object type (contact,event,task,journal,file,note,configuration)
	* @return array The Kolab object represented as hash array or false if not found
	*/
	public static function get_object($uid, $type)
	{
	self::setup();
	$folder = null;
	foreach ((array)self::list_folders('', '*', $type, null, $folderdata) as $foldername) {
	if (!$folder)
	$folder = new kolab_storage_folder($foldername, $type, $folderdata[$foldername]);
	else
	$folder->set_folder($foldername, $type, $folderdata[$foldername]);

	if ($object = $folder->get_object($uid))
	return $object;
	}

	return false;
	}

	/**
	* Execute cross-folder searches with the given query.
	*
	* @param array Pseudo-SQL query as list of filter parameter triplets
	* @param string Folder type (contact,event,task,journal,file,note,configuration)
	* @param int Expected number of records or limit (for performance reasons)
	*
	* @return array List of Kolab data objects (each represented as hash array)
	* @see kolab_storage_format::select()
	*/
	public static function select($query, $type, $limit = null)
	{
	self::setup();
	$folder = null;
	$result = array();

	foreach ((array)self::list_folders('', '*', $type, null, $folderdata) as $foldername) {
	$folder = new kolab_storage_folder($foldername, $type, $folderdata[$foldername]);

	if ($limit) {
	$folder->set_order_and_limit(null, $limit);
	}

	foreach ($folder->select($query) as $object) {
	$result[] = $object;
	}
	}

	return $result;
	}

	/**
	* Returns Free-busy server URL
	*/
	public static function get_freebusy_server()
	{
	$rcmail = rcube::get_instance();

	if ($url = $rcmail->config->get('kolab_freebusy_server')) {
	$url = rcube_utils::resolve_url($url);
	$url = unslashify($url);
	}

	return $url;
	}

	/**
	* Compose an URL to query the free/busy status for the given user
	*
	* @param string Email address of the user to get free/busy data for
	* @param object DateTime Start of the query range (optional)
	* @param object DateTime End of the query range (optional)
	*
	* @return ?string Fully qualified URL to query free/busy data
	*/
	public static function get_freebusy_url($email, $start = null, $end = null)
	{
	$url = self::get_freebusy_server();

	if (empty($url)) {
	return null;
	}

	$query = '';
	$param = array();
	$utc = new \DateTimeZone('UTC');

	// https://www.calconnect.org/pubdocs/CD0903%20Freebusy%20Read%20URL.pdf

	if ($start instanceof \DateTime) {
	$start->setTimezone($utc);
	$param['start'] = $param['dtstart'] = $start->format('Ymd\THis\Z');
	}

	if ($end instanceof \DateTime) {
	$end->setTimezone($utc);
	$param['end'] = $param['dtend'] = $end->format('Ymd\THis\Z');
	}

	if (!empty($param)) {
	$query = '?' . http_build_query($param);
	}

	if (strpos($url, '%u')) {
	// Expected configured full URL, just replace the %u variable
	// Note: Cyrus v3 Free-Busy service does not use .ifb extension
	$url = str_replace('%u', rawurlencode($email), $url);
	}
	else {
	$url .= '/' . $email . '.ifb';
	}

	return $url . $query;
	}

	/**
	* Creates folder ID from folder name
	*
	* @param string $folder Folder name (UTF7-IMAP)
	* @param bool $enc Use lossless encoding
	*
	* @return string Folder ID string
	*/
	public static function folder_id($folder, $enc = null)
	{
	return $enc == true \|\| ($enc === null && self::$encode_ids) ?
	self::id_encode($folder) :
	asciiwords(strtr($folder, '/.-', '___'));
	}

	/**
	* Encode the given ID to a safe ascii representation
	*
	* @param string $id Arbitrary identifier string
	*
	* @return string Ascii representation
	*/
	public static function id_encode($id)
	{
	return rtrim(strtr(base64_encode($id), '+/', '-_'), '=');
	}

	/**
	* Convert the given identifier back to it's raw value
	*
	* @param string $id Ascii identifier
	* @return string Raw identifier string
	*/
	public static function id_decode($id)
	{
	return base64_decode(str_pad(strtr($id, '-_', '+/'), strlen($id) % 4, '=', STR_PAD_RIGHT));
	}

	/**
	* Return the (first) path of the requested IMAP namespace
	*
	* @param string Namespace name (personal, shared, other)
	* @return string IMAP root path for that namespace
	*/
	public static function namespace_root($name)
	{
	self::setup();

	foreach ((array)self::$imap->get_namespace($name) as $paths) {
	if (strlen($paths[0]) > 1) {
	return $paths[0];
	}
	}

	return '';
	}

	/**
	* Deletes IMAP folder
	*
	* @param string $name Folder name (UTF7-IMAP)
	*
	* @return bool True on success, false on failure
	*/
	public static function folder_delete($name)
	{
	// clear cached entries first
	if ($folder = self::get_folder($name))
	$folder->cache->purge();

	$rcmail = rcube::get_instance();
	$plugin = $rcmail->plugins->exec_hook('folder_delete', array('name' => $name));

	$success = self::$imap->delete_folder($name);
	self::$last_error = self::$imap->get_error_str();

	return $success;
	}

	/**
	* Creates IMAP folder
	*
	* @param string $name Folder name (UTF7-IMAP)
	* @param string $type Folder type
	* @param bool $subscribed Sets folder subscription
	* @param bool $active Sets folder state (client-side subscription)
	*
	* @return bool True on success, false on failure
	*/
	public static function folder_create($name, $type = null, $subscribed = false, $active = false)
	{
	self::setup();

	$rcmail = rcube::get_instance();
	$plugin = $rcmail->plugins->exec_hook('folder_create', array('record' => array(
	'name' => $name,
	'subscribe' => $subscribed,
	)));

	if ($saved = self::$imap->create_folder($name, $subscribed)) {
	// set metadata for folder type
	if ($type) {
	$saved = self::set_folder_type($name, $type);

	// revert if metadata could not be set
	if (!$saved) {
	self::$imap->delete_folder($name);
	}
	// activate folder
	else if ($active) {
	self::set_state($name, true);
	}
	}
	}

	if ($saved) {
	return true;
	}

	self::$last_error = self::$imap->get_error_str();
	return false;
	}

	/**
	* Renames IMAP folder
	*
	* @param string $oldname Old folder name (UTF7-IMAP)
	* @param string $newname New folder name (UTF7-IMAP)
	*
	* @return bool True on success, false on failure
	*/
	public static function folder_rename($oldname, $newname)
	{
	self::setup();

	$rcmail = rcube::get_instance();
	$plugin = $rcmail->plugins->exec_hook('folder_rename', array(
	'oldname' => $oldname, 'newname' => $newname));

	$oldfolder = self::get_folder($oldname);
	$active = self::folder_is_active($oldname);
	$success = self::$imap->rename_folder($oldname, $newname);
	self::$last_error = self::$imap->get_error_str();

	// pass active state to new folder name
	if ($success && $active) {
	self::set_state($oldname, false);
	self::set_state($newname, true);
	}

	// assign existing cache entries to new resource uri
	if ($success && $oldfolder) {
	$oldfolder->cache->rename($newname);
	}

	return $success;
	}

	/**
	* Rename or Create a new IMAP folder.
	*
	* Does additional checks for permissions and folder name restrictions
	*
	* @param array &$prop Hash array with folder properties and metadata
	* - name: Folder name
	* - oldname: Old folder name when changed
	* - parent: Parent folder to create the new one in
	* - type: Folder type to create
	* - subscribed: Subscribed flag (IMAP subscription)
	* - active: Activation flag (client-side subscription)
	*
	* @return string\|false New folder name or False on failure
	*
	* @see self::set_folder_props() for list of other properties
	*/
	public static function folder_update(&$prop)
	{
	self::setup();

	$folder = rcube_charset::convert($prop['name'], RCUBE_CHARSET, 'UTF7-IMAP');
	$oldfolder = $prop['oldname']; // UTF7
	$parent = $prop['parent']; // UTF7
	$delimiter = self::$imap->get_hierarchy_delimiter();

	if (strlen($oldfolder)) {
	$options = self::$imap->folder_info($oldfolder);
	}

	if (!empty($options) && ($options['norename'] \|\| $options['protected'])) {
	}
	// sanity checks (from steps/settings/save_folder.inc)
	else if (!strlen($folder)) {
	self::$last_error = 'cannotbeempty';
	return false;
	}
	else if (strlen($folder) > 128) {
	self::$last_error = 'nametoolong';
	return false;
	}
	else {
	// these characters are problematic e.g. when used in LIST/LSUB
	foreach (array($delimiter, '%', '*') as $char) {
	if (strpos($folder, $char) !== false) {
	self::$last_error = 'forbiddencharacter';
	return false;
	}
	}
	}

	if (!empty($options) && (!empty($options['protected']) \|\| !empty($options['norename']))) {
	$folder = $oldfolder;
	}
	else if (strlen($parent)) {
	$folder = $parent . $delimiter . $folder;
	}
	else {
	// add namespace prefix (when needed)
	$folder = self::$imap->mod_folder($folder, 'in');
	}

	// Check access rights to the parent folder
	if (strlen($parent) && (!strlen($oldfolder) \|\| $oldfolder != $folder)) {
	$parent_opts = self::$imap->folder_info($parent);
	if ($parent_opts['namespace'] != 'personal'
	&& (empty($parent_opts['rights']) \|\| !preg_match('/[ck]/', implode($parent_opts['rights'])))
	) {
	self::$last_error = 'No permission to create folder';
	return false;
	}
	}

	// update the folder name
	if (strlen($oldfolder)) {
	if ($oldfolder != $folder) {
	$result = self::folder_rename($oldfolder, $folder);
	}
	else {
	$result = true;
	}
	}
	// create new folder
	else {
	$result = self::folder_create($folder, $prop['type'], $prop['subscribed'], $prop['active']);
	}

	if ($result) {
	self::set_folder_props($folder, $prop);
	}

	return $result ? $folder : false;
	}

	/**
	* Getter for human-readable name of Kolab object (folder)
	* with kolab_custom_display_names support.
	* See http://wiki.kolab.org/UI-Concepts/Folder-Listing for reference
	*
	* @param string $folder IMAP folder name (UTF7-IMAP)
	* @param string $folder_ns Will be set to namespace name of the folder
	*
	* @return string Name of the folder-object
	*/
	public static function object_name($folder, &$folder_ns=null)
	{
	// find custom display name in folder METADATA
	if ($name = self::custom_displayname($folder)) {
	return $name;
	}

	return self::object_prettyname($folder, $folder_ns);
	}

	/**
	* Get custom display name (saved in metadata) for the given folder
	*/
	public static function custom_displayname($folder)
	{
	static $_metadata;

	// find custom display name in folder METADATA
	if (self::$config->get('kolab_custom_display_names', true) && self::setup()) {
	if ($_metadata !== null) {
	$metadata = $_metadata;
	}
	else {
	// For performance reasons ask for all folders, it will be cached as one cache entry
	$metadata = self::$imap->get_metadata("*", [self::NAME_KEY_PRIVATE, self::NAME_KEY_SHARED]);

	// If cache is disabled store result in memory
	if (!self::$config->get('imap_cache')) {
	$_metadata = $metadata;
	}
	}

	if ($data = $metadata[$folder] ?? null) {
	if (($name = $data[self::NAME_KEY_PRIVATE]) \|\| ($name = $data[self::NAME_KEY_SHARED])) {
	return $name;
	}
	}
	}

	return false;
	}

	/**
	* Getter for human-readable name of Kolab object (folder)
	* See http://wiki.kolab.org/UI-Concepts/Folder-Listing for reference
	*
	* @param string $folder IMAP folder name (UTF7-IMAP)
	* @param string $folder_ns Will be set to namespace name of the folder
	*
	* @return string Name of the folder-object
	*/
	public static function object_prettyname($folder, &$folder_ns = null)
	{
	self::setup();

	$found = false;
	$namespace = self::$imap->get_namespace();
	$prefix = null;

	if (!empty($namespace['shared'])) {
	foreach ($namespace['shared'] as $ns) {
	if (strlen($ns[0]) && strpos($folder, $ns[0]) === 0) {
	$prefix = '';
	$folder = substr($folder, strlen($ns[0]));
	$delim = $ns[1];
	$found = true;
	$folder_ns = 'shared';
	break;
	}
	}
	}

	if (!$found && !empty($namespace['other'])) {
	foreach ($namespace['other'] as $ns) {
	if (strlen($ns[0]) && strpos($folder, $ns[0]) === 0) {
	// remove namespace prefix and extract username
	$folder = substr($folder, strlen($ns[0]));
	$delim = $ns[1];

	// get username part and map it to user name
	$pos = strpos($folder, $delim);
	$fid = $pos ? substr($folder, 0, $pos) : $folder;

	if ($user = self::folder_id2user($fid, true)) {
	$fid = str_replace($delim, '', $user);
	}

	$prefix = "($fid)";
	$folder = $pos ? substr($folder, $pos + 1) : '';
	$found = true;
	$folder_ns = 'other';
	break;
	}
	}
	}

	if (!$found && !empty($namespace['personal'])) {
	foreach ($namespace['personal'] as $ns) {
	if (strlen($ns[0]) && strpos($folder, $ns[0]) === 0) {
	// remove namespace prefix
	$folder = substr($folder, strlen($ns[0]));
	$prefix = '';
	$delim = $ns[1];
	$found = true;
	break;
	}
	}
	}

	if (empty($delim)) {
	$delim = self::$imap->get_hierarchy_delimiter();
	}

	$folder = rcube_charset::convert($folder, 'UTF7-IMAP');
	$folder = html::quote($folder);
	$folder = str_replace(html::quote($delim), ' » ', $folder);

	if ($prefix) {
	$folder = html::quote($prefix) . ($folder !== '' ? ' ' . $folder : '');
	}

	if (empty($folder_ns)) {
	$folder_ns = 'personal';
	}

	return $folder;
	}

	/**
	* Helper method to generate a truncated folder name to display.
	* Note: $origname is a string returned by self::object_name()
	*/
	public static function folder_displayname($origname, &$names)
	{
	$name = $origname;

	// find folder prefix to truncate
	for ($i = count($names)-1; $i >= 0; $i--) {
	if (strpos($name, $names[$i] . ' » ') === 0) {
	$length = strlen($names[$i] . ' » ');
	$prefix = substr($name, 0, $length);
	$count = count(explode(' » ', $prefix));
	$diff = 1;

	// check if prefix folder is in other users namespace
	for ($n = count($names)-1; $n >= 0; $n--) {
	if (strpos($prefix, '(' . $names[$n] . ') ') === 0) {
	$diff = 0;
	break;
	}
	}

	$name = str_repeat('   ', $count - $diff) . '» ' . substr($name, $length);
	break;
	}
	// other users namespace and parent folder exists
	else if (strpos($name, '(' . $names[$i] . ') ') === 0) {
	$length = strlen('(' . $names[$i] . ') ');
	$prefix = substr($name, 0, $length);
	$count = count(explode(' » ', $prefix));
	$name = str_repeat('   ', $count) . '» ' . substr($name, $length);
	break;
	}
	}

	$names[] = $origname;

	return $name;
	}

	/**
	* Creates a SELECT field with folders list
	*
	* @param string $type Folder type
	* @param array $attrs SELECT field attributes (e.g. name)
	* @param string $current The name of current folder (to skip it)
	*
	* @return html_select SELECT object
	*/
	public static function folder_selector($type, $attrs, $current = '')
	{
	// get all folders of specified type (sorted)
	$folders = self::get_folders($type, true);

	$delim = self::$imap->get_hierarchy_delimiter();
	$names = array();
	$len = strlen($current);
	+ $p_len = 0;

	if ($len && ($rpos = strrpos($current, $delim))) {
	$parent = substr($current, 0, $rpos);
	$p_len = strlen($parent);
	}

	// Filter folders list
	foreach ($folders as $c_folder) {
	$name = $c_folder->name;

	// skip current folder and it's subfolders
	if ($len) {
	if ($name == $current) {
	// Make sure parent folder is listed (might be skipped e.g. if it's namespace root)
	if ($p_len && !isset($names[$parent])) {
	$names[$parent] = self::object_name($parent);
	}
	continue;
	}
	if (strpos($name, $current.$delim) === 0) {
	continue;
	}
	}

	- // always show the parent of current folder
	if ($p_len && $name == $parent) {
	+ // always show the parent of current folder
	}
	- // skip folders where user have no rights to create subfolders
	else if ($c_folder->get_owner() != $_SESSION['username']) {
	+ // skip folders where user have no rights to create subfolders
	$rights = $c_folder->get_myrights();
	if (!preg_match('/[ck]/', $rights)) {
	continue;
	}
	}

	$names[$name] = $c_folder->get_name();
	}

	// Build SELECT field of parent folder
	$attrs['is_escaped'] = true;
	$select = new html_select($attrs);
	$select->add('---', '');

	$listnames = array();
	foreach (array_keys($names) as $imap_name) {
	$name = $origname = $names[$imap_name];

	// find folder prefix to truncate
	for ($i = count($listnames)-1; $i >= 0; $i--) {
	if (strpos($name, $listnames[$i].' » ') === 0) {
	$length = strlen($listnames[$i].' » ');
	$prefix = substr($name, 0, $length);
	$count = count(explode(' » ', $prefix));
	$name = str_repeat('  ', $count-1) . '» ' . substr($name, $length);
	break;
	}
	}

	$listnames[] = $origname;
	$select->add($name, $imap_name);
	}

	return $select;
	}

	/**
	* Returns a list of folder names
	*
	* @param string Optional root folder
	* @param string Optional name pattern
	* @param string Data type to list folders for (contact,event,task,journal,file,note,mail,configuration)
	* @param bool Enable to return subscribed folders only (null to use configured subscription mode)
	* @param array Will be filled with folder-types data
	*
	* @return array List of folders
	*/
	public static function list_folders($root = '', $mbox = '*', $filter = null, $subscribed = null, &$folderdata = array())
	{
	if (!self::setup()) {
	return null;
	}

	// use IMAP subscriptions
	if ($subscribed === null && self::$config->get('kolab_use_subscriptions')) {
	$subscribed = true;
	}

	if (!$filter) {
	// Get ALL folders list, standard way
	if ($subscribed) {
	$folders = self::_imap_list_subscribed($root, $mbox, $filter);
	}
	else {
	$folders = self::_imap_list_folders($root, $mbox);
	}

	return $folders;
	}
	$prefix = $root . $mbox;
	$regexp = '/^' . preg_quote($filter, '/') . '(\..+)?$/';

	// get folders types for all folders
	$folderdata = self::folders_typedata($prefix);

	if (!is_array($folderdata)) {
	return array();
	}

	// If we only want groupware folders and don't care about the subscription state,
	// then the metadata will already contain all folder names and we can avoid the LIST below.
	if (!$subscribed && $filter != 'mail' && $prefix == '*') {
	foreach ($folderdata as $folder => $type) {
	if (!preg_match($regexp, (string) $type)) {
	unset($folderdata[$folder]);
	}
	}

	return self::$imap->sort_folder_list(array_keys($folderdata), true);
	}

	// Get folders list
	if ($subscribed) {
	$folders = self::_imap_list_subscribed($root, $mbox, $filter);
	}
	else {
	$folders = self::_imap_list_folders($root, $mbox);
	}

	// In case of an error, return empty list (?)
	if (!is_array($folders)) {
	return array();
	}

	// Filter folders list
	foreach ($folders as $idx => $folder) {
	$type = $folderdata[$folder] ?? null;

	if ($filter == 'mail' && empty($type)) {
	continue;
	}

	if (empty($type) \|\| !preg_match($regexp, $type)) {
	unset($folders[$idx]);
	}
	}

	return $folders;
	}

	/**
	* Wrapper for rcube_imap::list_folders() with optional post-filtering
	*/
	protected static function _imap_list_folders($root, $mbox)
	{
	$postfilter = null;

	// compose a post-filter expression for the excluded namespaces
	if ($root . $mbox == '*' && ($skip_ns = self::$config->get('kolab_skip_namespace'))) {
	$excludes = array();
	foreach ((array)$skip_ns as $ns) {
	if ($ns_root = self::namespace_root($ns)) {
	$excludes[] = $ns_root;
	}
	}

	if (count($excludes)) {
	$postfilter = '!^(' . join(')\|(', array_map('preg_quote', $excludes)) . ')!';
	}
	}

	// use normal LIST command to return all folders, it's fast enough
	$folders = self::$imap->list_folders($root, $mbox, null, null, !empty($postfilter));

	if (!empty($postfilter)) {
	$folders = array_filter($folders, function($folder) use ($postfilter) { return !preg_match($postfilter, $folder); });
	$folders = self::$imap->sort_folder_list($folders);
	}

	return $folders;
	}

	/**
	* Wrapper for rcube_imap::list_folders_subscribed()
	* with support for temporarily subscribed folders
	*/
	protected static function _imap_list_subscribed($root, $mbox, $filter = null)
	{
	$folders = self::$imap->list_folders_subscribed($root, $mbox);

	// add temporarily subscribed folders
	if ($filter != 'mail' && self::$with_tempsubs && is_array($_SESSION['kolab_subscribed_folders'] ?? null)) {
	$folders = array_unique(array_merge($folders, $_SESSION['kolab_subscribed_folders']));
	}

	return $folders;
	}

	/**
	* Search for shared or otherwise not listed groupware folders the user has access
	*
	* @param string Folder type of folders to search for
	* @param string Search string
	* @param array Namespace(s) to exclude results from
	*
	* @return array List of matching kolab_storage_folder objects
	*/
	public static function search_folders($type, $query, $exclude_ns = array())
	{
	if (!self::setup()) {
	return array();
	}

	$folders = array();
	$query = str_replace('*', '', $query);

	// find unsubscribed IMAP folders of the given type
	foreach ((array)self::list_folders('', '*', $type, false, $folderdata) as $foldername) {
	// FIXME: only consider the last part of the folder path for searching?
	$realname = strtolower(rcube_charset::convert($foldername, 'UTF7-IMAP'));
	if (($query == '' \|\| strpos($realname, $query) !== false) &&
	!self::folder_is_subscribed($foldername, true) &&
	!in_array(self::$imap->folder_namespace($foldername), (array)$exclude_ns)
	) {
	$folders[] = new kolab_storage_folder($foldername, $type, $folderdata[$foldername]);
	}
	}

	return $folders;
	}

	/**
	* Sort the given list of kolab folders by namespace/name
	*
	* @param array List of kolab_storage_folder objects
	* @return array Sorted list of folders
	*/
	public static function sort_folders($folders)
	{
	$pad = ' ';
	$out = array();
	$nsnames = array('personal' => array(), 'shared' => array(), 'other' => array());

	foreach ($folders as $folder) {
	$_folders[$folder->name] = $folder;
	$ns = $folder->get_namespace();
	$nsnames[$ns][$folder->name] = strtolower(html_entity_decode($folder->get_name(), ENT_COMPAT, RCUBE_CHARSET)) . $pad; // decode »
	}

	// $folders is a result of get_folders() we can assume folders were already sorted
	foreach (array_keys($nsnames) as $ns) {
	asort($nsnames[$ns], SORT_LOCALE_STRING);
	foreach (array_keys($nsnames[$ns]) as $utf7name) {
	$out[] = $_folders[$utf7name];
	}
	}

	return $out;
	}

	/**
	* Check the folder tree and add the missing parents as virtual folders
	*
	* @param array $folders Folders list
	* @param object $tree Reference to the root node of the folder tree
	*
	* @return array Flat folders list
	*/
	public static function folder_hierarchy($folders, &$tree = null)
	{
	if (!self::setup()) {
	return array();
	}

	$_folders = array();
	$delim = self::$imap->get_hierarchy_delimiter();
	$other_ns = rtrim(self::namespace_root('other'), $delim);
	$tree = new kolab_storage_folder_virtual('', '<root>', ''); // create tree root
	$refs = array('' => $tree);

	foreach ($folders as $idx => $folder) {
	$path = explode($delim, $folder->name);
	array_pop($path);
	$folder->parent = join($delim, $path);
	$folder->children = array(); // reset list

	// skip top folders or ones with a custom displayname
	if (count($path) < 1 \|\| kolab_storage::custom_displayname($folder->name)) {
	$tree->children[] = $folder;
	}
	else {
	$parents = array();
	$depth = $folder->get_namespace() == 'personal' ? 1 : 2;

	while (count($path) >= $depth && ($parent = join($delim, $path))) {
	array_pop($path);
	$parent_parent = join($delim, $path);

	if (!$refs[$parent]) {
	if ($folder->type && self::folder_type($parent) == $folder->type) {
	$refs[$parent] = new kolab_storage_folder($parent, $folder->type, $folder->type);
	$refs[$parent]->parent = $parent_parent;
	}
	else if ($parent_parent == $other_ns) {
	$refs[$parent] = new kolab_storage_folder_user($parent, $parent_parent);
	}
	else {
	$name = kolab_storage::object_name($parent);
	$refs[$parent] = new kolab_storage_folder_virtual($parent, $name, $folder->get_namespace(), $parent_parent);
	}
	$parents[] = $refs[$parent];
	}
	}

	if (!empty($parents)) {
	$parents = array_reverse($parents);
	foreach ($parents as $parent) {
	$parent_node = !empty($refs[$parent->parent]) ? $refs[$parent->parent] : $tree;
	$parent_node->children[] = $parent;
	$_folders[] = $parent;
	}
	}

	$parent_node = !empty($refs[$folder->parent]) ? $refs[$folder->parent] : $tree;
	$parent_node->children[] = $folder;
	}

	$refs[$folder->name] = $folder;
	$_folders[] = $folder;
	unset($folders[$idx]);
	}

	return $_folders;
	}

	/**
	* Returns folder types indexed by folder name
	*
	* @param string $prefix Folder prefix (Default '*' for all folders)
	*
	* @return array\|bool List of folders, False on failure
	*/
	public static function folders_typedata($prefix = '*')
	{
	if (!self::setup()) {
	return false;
	}

	$type_keys = array(self::CTYPE_KEY, self::CTYPE_KEY_PRIVATE);

	// fetch metadata from some folders only
	if (($prefix == '*' \|\| $prefix == '') && ($skip_ns = self::$config->get('kolab_skip_namespace'))) {
	$delimiter = self::$imap->get_hierarchy_delimiter();
	$folderdata = $blacklist = array();
	foreach ((array)$skip_ns as $ns) {
	if ($ns_root = rtrim(self::namespace_root($ns), $delimiter)) {
	$blacklist[] = $ns_root;
	}
	}
	foreach (array('personal','other','shared') as $ns) {
	if (!in_array($ns, (array)$skip_ns)) {
	$ns_root = rtrim(self::namespace_root($ns), $delimiter);

	// list top-level folders and their childs one by one
	// GETMETADATA "%" doesn't list shared or other namespace folders but "*" would
	if ($ns_root == '') {
	foreach ((array)self::$imap->get_metadata('%', $type_keys) as $folder => $metadata) {
	if (!in_array($folder, $blacklist)) {
	$folderdata[$folder] = $metadata;
	$opts = self::$imap->folder_attributes($folder);
	if (!in_array('\\HasNoChildren', $opts) && ($data = self::$imap->get_metadata($folder.$delimiter.'*', $type_keys))) {
	$folderdata += $data;
	}
	}
	}
	}
	else if ($data = self::$imap->get_metadata($ns_root.$delimiter.'*', $type_keys)) {
	$folderdata += $data;
	}
	}
	}
	}
	else {
	$folderdata = self::$imap->get_metadata($prefix, $type_keys);
	}

	if (!is_array($folderdata)) {
	return false;
	}

	return array_map(array('kolab_storage', 'folder_select_metadata'), $folderdata);
	}

	/**
	* Callback for array_map to select the correct annotation value
	*/
	public static function folder_select_metadata($types)
	{
	if (!empty($types[self::CTYPE_KEY_PRIVATE])) {
	return $types[self::CTYPE_KEY_PRIVATE];
	}
	else if (!empty($types[self::CTYPE_KEY])) {
	list($ctype, ) = explode('.', $types[self::CTYPE_KEY]);
	return $ctype;
	}
	return null;
	}

	/**
	* Returns type of IMAP folder
	*
	* @param string $folder Folder name (UTF7-IMAP)
	*
	* @return string Folder type
	*/
	public static function folder_type($folder)
	{
	self::setup();

	$metadata = self::$imap->get_metadata($folder, array(self::CTYPE_KEY, self::CTYPE_KEY_PRIVATE));

	if (!is_array($metadata)) {
	return null;
	}

	if (!empty($metadata[$folder])) {
	return self::folder_select_metadata($metadata[$folder]);
	}

	return 'mail';
	}

	/**
	* Sets folder content-type.
	*
	* @param string $folder Folder name
	* @param string $type Content type
	*
	* @return bool True on success
	*/
	public static function set_folder_type($folder, $type = 'mail')
	{
	self::setup();

	list($ctype, $subtype) = strpos($type, '.') !== false ? explode('.', $type) : array($type, null);

	$success = self::$imap->set_metadata($folder, array(self::CTYPE_KEY => $ctype, self::CTYPE_KEY_PRIVATE => $subtype ? $type : null));

	if (!$success) {
	// fallback: only set private annotation
	$success \|= self::$imap->set_metadata($folder, array(self::CTYPE_KEY_PRIVATE => $type));
	}

	return $success;
	}

	/**
	* Check subscription status of this folder
	*
	* @param string $folder Folder name
	* @param bool $temp Include temporary/session subscriptions
	*
	* @return bool True if subscribed, false if not
	*/
	public static function folder_is_subscribed($folder, $temp = false)
	{
	if (self::$subscriptions === null) {
	self::setup();
	self::$with_tempsubs = false;
	self::$subscriptions = self::$imap->list_folders_subscribed();
	self::$with_tempsubs = true;
	}

	return in_array($folder, self::$subscriptions) \|\|
	($temp && in_array($folder, (array)$_SESSION['kolab_subscribed_folders']));
	}

	/**
	* Change subscription status of this folder
	*
	* @param string $folder Folder name
	* @param bool $temp Only subscribe temporarily for the current session
	*
	* @return bool True on success, false on error
	*/
	public static function folder_subscribe($folder, $temp = false)
	{
	self::setup();

	// temporary/session subscription
	if ($temp) {
	if (self::folder_is_subscribed($folder)) {
	return true;
	}
	else if (empty($_SESSION['kolab_subscribed_folders']) \|\| !in_array($folder, $_SESSION['kolab_subscribed_folders'])) {
	$_SESSION['kolab_subscribed_folders'][] = $folder;
	return true;
	}
	}
	else if (self::$imap->subscribe($folder)) {
	self::$subscriptions = null;
	return true;
	}

	return false;
	}

	/**
	* Change subscription status of this folder
	*
	* @param string $folder Folder name
	* @param bool $temp Only remove temporary subscription
	*
	* @return bool True on success, false on error
	*/
	public static function folder_unsubscribe($folder, $temp = false)
	{
	self::setup();

	// temporary/session subscription
	if ($temp) {
	if (!empty($_SESSION['kolab_subscribed_folders']) && ($i = array_search($folder, $_SESSION['kolab_subscribed_folders'])) !== false) {
	unset($_SESSION['kolab_subscribed_folders'][$i]);
	}
	return true;
	}
	else if (self::$imap->unsubscribe($folder)) {
	self::$subscriptions = null;
	return true;
	}

	return false;
	}

	/**
	* Check activation status of this folder
	*
	* @param string $folder Folder name
	*
	* @return bool True if active, false if not
	*/
	public static function folder_is_active($folder)
	{
	$active_folders = self::get_states();

	return in_array($folder, $active_folders);
	}

	/**
	* Change activation status of this folder
	*
	* @param string $folder Folder name
	*
	* @return bool True on success, false on error
	*/
	public static function folder_activate($folder)
	{
	// activation implies temporary subscription
	self::folder_subscribe($folder, true);
	return self::set_state($folder, true);
	}

	/**
	* Change activation status of this folder
	*
	* @param string $folder Folder name
	*
	* @return bool True on success, false on error
	*/
	public static function folder_deactivate($folder)
	{
	// remove from temp subscriptions, really?
	self::folder_unsubscribe($folder, true);

	return self::set_state($folder, false);
	}

	/**
	* Return list of active folders
	*/
	private static function get_states()
	{
	if (self::$states !== null) {
	return self::$states;
	}

	$rcube = rcube::get_instance();
	$folders = $rcube->config->get('kolab_active_folders');

	if ($folders !== null) {
	self::$states = !empty($folders) ? explode('**', $folders) : array();
	}
	// for backward-compatibility copy server-side subscriptions to activation states
	else {
	self::setup();
	if (self::$subscriptions === null) {
	self::$with_tempsubs = false;
	self::$subscriptions = self::$imap->list_folders_subscribed();
	self::$with_tempsubs = true;
	}
	self::$states = (array) self::$subscriptions;
	$folders = implode('**', self::$states);
	$rcube->user->save_prefs(array('kolab_active_folders' => $folders));
	}

	return self::$states;
	}

	/**
	* Update list of active folders
	*/
	private static function set_state($folder, $state)
	{
	self::get_states();

	// update in-memory list
	$idx = array_search($folder, self::$states);
	if ($state && $idx === false) {
	self::$states[] = $folder;
	}
	else if (!$state && $idx !== false) {
	unset(self::$states[$idx]);
	}

	// update user preferences
	$folders = implode('**', self::$states);

	return rcube::get_instance()->user->save_prefs(array('kolab_active_folders' => $folders));
	}

	/**
	* Creates default folder of specified type
	* To be run when none of subscribed folders (of specified type) is found
	*
	* @param string $type Folder type
	* @param string $props Folder properties (color, etc)
	*
	* @return string Folder name
	*/
	public static function create_default_folder($type, $props = array())
	{
	if (!self::setup()) {
	return;
	}

	$folders = self::$imap->get_metadata('*', array(kolab_storage::CTYPE_KEY_PRIVATE));

	// from kolab_folders config
	$folder_type = strpos($type, '.') ? str_replace('.', '_', $type) : $type . '_default';
	$default_name = self::$config->get('kolab_folders_' . $folder_type);
	$folder_type = str_replace('_', '.', $folder_type);

	// check if we have any folder in personal namespace
	// folder(s) may exist but not subscribed
	foreach ((array)$folders as $f => $data) {
	if (strpos($data[self::CTYPE_KEY_PRIVATE], $type) === 0) {
	$folder = $f;
	break;
	}
	}

	if (!$folder) {
	if (!$default_name) {
	$default_name = self::$default_folders[$type];
	}

	if (!$default_name) {
	return;
	}

	$folder = rcube_charset::convert($default_name, RCUBE_CHARSET, 'UTF7-IMAP');
	$prefix = self::$imap->get_namespace('prefix');

	// add personal namespace prefix if needed
	if ($prefix && strpos($folder, $prefix) !== 0 && $folder != 'INBOX') {
	$folder = $prefix . $folder;
	}

	if (!self::$imap->folder_exists($folder)) {
	if (!self::$imap->create_folder($folder)) {
	return;
	}
	}

	self::set_folder_type($folder, $folder_type);
	}

	self::folder_subscribe($folder);

	if ($props['active']) {
	self::set_state($folder, true);
	}

	if (!empty($props)) {
	self::set_folder_props($folder, $props);
	}

	return $folder;
	}

	/**
	* Sets folder metadata properties
	*
	* @param string $folder Folder name
	* @param array &$prop Folder properties (color, displayname)
	*/
	public static function set_folder_props($folder, &$prop)
	{
	if (!self::setup()) {
	return;
	}

	// TODO: also save 'showalarams' and other properties here
	$ns = self::$imap->folder_namespace($folder);
	$supported = array(
	'color' => array(self::COLOR_KEY_SHARED, self::COLOR_KEY_PRIVATE),
	'displayname' => array(self::NAME_KEY_SHARED, self::NAME_KEY_PRIVATE),
	);

	foreach ($supported as $key => $metakeys) {
	if (array_key_exists($key, $prop)) {
	$meta_saved = false;
	if ($ns == 'personal') // save in shared namespace for personal folders
	$meta_saved = self::$imap->set_metadata($folder, array($metakeys[0] => $prop[$key]));
	if (!$meta_saved) // try in private namespace
	$meta_saved = self::$imap->set_metadata($folder, array($metakeys[1] => $prop[$key]));
	if ($meta_saved)
	unset($prop[$key]); // unsetting will prevent fallback to local user prefs
	}
	}
	}

	/**
	* Search users in Kolab LDAP storage
	*
	* @param mixed $query Search value (or array of field => value pairs)
	* @param int $mode Matching mode: 0 - partial (abc), 1 - strict (=), 2 - prefix (abc*)
	* @param array $required List of fields that shall ot be empty
	* @param int $limit Maximum number of records
	* @param int $count Returns the number of records found
	*
	* @return array List of users
	*/
	public static function search_users($query, $mode = 1, $required = array(), $limit = 0, &$count = 0)
	{
	$query = str_replace('*', '', $query);

	// requires a working LDAP setup
	if (!strlen($query) \|\| !($ldap = self::ldap())) {
	return array();
	}

	$root = self::namespace_root('other');
	$user_attrib = self::$config->get('kolab_users_id_attrib', self::$config->get('kolab_auth_login', 'mail'));
	$search_attrib = self::$config->get('kolab_users_search_attrib', array('cn','mail','alias'));

	// search users using the configured attributes
	$results = $ldap->dosearch($search_attrib, $query, $mode, $required, $limit, $count);

	// exclude myself
	if ($_SESSION['kolab_dn']) {
	unset($results[$_SESSION['kolab_dn']]);
	}

	// resolve to IMAP folder name
	array_walk($results, function(&$user, $dn) use ($root, $user_attrib) {
	list($localpart, ) = explode('@', $user[$user_attrib]);
	$user['kolabtargetfolder'] = $root . $localpart;
	});

	return $results;
	}

	/**
	* Returns a list of IMAP folders shared by the given user
	*
	* @param array User entry from LDAP
	* @param string Data type to list folders for (contact,event,task,journal,file,note,mail,configuration)
	* @param int 1 - subscribed folders only, 0 - all folders, 2 - all non-active
	* @param array Will be filled with folder-types data
	*
	* @return array List of folders
	*/
	public static function list_user_folders($user, $type, $subscribed = 0, &$folderdata = array())
	{
	self::setup();

	$folders = array();

	// use localpart of user attribute as root for folder listing
	$user_attrib = self::$config->get('kolab_users_id_attrib', self::$config->get('kolab_auth_login', 'mail'));
	if (!empty($user[$user_attrib])) {
	list($mbox) = explode('@', $user[$user_attrib]);

	$delimiter = self::$imap->get_hierarchy_delimiter();
	$other_ns = self::namespace_root('other');
	$prefix = $other_ns . $mbox . $delimiter;
	$subscribed = (int) $subscribed;
	$subs = $subscribed < 2 ? (bool) $subscribed : false;
	$folders = self::list_folders($prefix, '*', $type, $subs, $folderdata);

	if ($subscribed === 2 && !empty($folders)) {
	$active = self::get_states();
	if (!empty($active)) {
	$folders = array_diff($folders, $active);
	}
	}
	}

	return $folders;
	}

	/**
	* Get a list of (virtual) top-level folders from the other users namespace
	*
	* @param string Data type to list folders for (contact,event,task,journal,file,note,mail,configuration)
	* @param bool Enable to return subscribed folders only (null to use configured subscription mode)
	*
	* @return array List of kolab_storage_folder_user objects
	*/
	public static function get_user_folders($type, $subscribed)
	{
	$folders = $folderdata = array();

	if (self::setup()) {
	$delimiter = self::$imap->get_hierarchy_delimiter();
	$other_ns = rtrim(self::namespace_root('other'), $delimiter);
	$path_len = count(explode($delimiter, $other_ns));

	foreach ((array) self::list_folders($other_ns . $delimiter, '*', '', $subscribed) as $foldername) {
	if ($foldername == 'INBOX') // skip INBOX which is added by default
	continue;

	$path = explode($delimiter, $foldername);

	// compare folder type if a subfolder is listed
	if ($type && count($path) > $path_len + 1 && $type != self::folder_type($foldername)) {
	continue;
	}

	// truncate folder path to top-level folders of the 'other' namespace
	$foldername = join($delimiter, array_slice($path, 0, $path_len + 1));

	if (empty($folders[$foldername])) {
	$folders[$foldername] = new kolab_storage_folder_user($foldername, $other_ns);
	}
	}

	// for every (subscribed) user folder, list all (unsubscribed) subfolders
	foreach ($folders as $userfolder) {
	foreach ((array) self::list_folders($userfolder->name . $delimiter, '*', $type, false, $folderdata) as $foldername) {
	if (empty($folders[$foldername])) {
	$folders[$foldername] = new kolab_storage_folder($foldername, $type, $folderdata[$foldername] ?? null);
	$userfolder->children[] = $folders[$foldername];
	}
	}
	}
	}

	return $folders;
	}

	/**
	* Handler for user_delete plugin hooks
	*
	* Remove all cache data from the local database related to the given user.
	*/
	public static function delete_user_folders($args)
	{
	$db = rcmail::get_instance()->get_dbh();
	$prefix = 'imap://' . urlencode($args['username']) . '@' . $args['host'] . '/%';
	$db->query("DELETE FROM " . $db->table_name('kolab_folders', true) . " WHERE `resource` LIKE ?", $prefix);

	}

	/**
	* Get folder METADATA for all supported keys
	* Do this in one go for better caching performance
	*/
	public static function folder_metadata($folder)
	{
	if (self::setup()) {
	$keys = array(
	// For better performance we skip displayname here, see (self::custom_displayname())
	// self::NAME_KEY_PRIVATE,
	// self::NAME_KEY_SHARED,
	self::CTYPE_KEY,
	self::CTYPE_KEY_PRIVATE,
	self::COLOR_KEY_PRIVATE,
	self::COLOR_KEY_SHARED,
	self::UID_KEY_SHARED,
	self::UID_KEY_CYRUS,
	);

	$metadata = self::$imap->get_metadata($folder, $keys);

	return $metadata[$folder];
	}
	}

	/**
	* Get user attributes for specified other user (imap) folder identifier.
	*
	* @param string $folder_id Folder name w/o path (imap user identifier)
	* @param bool $as_string Return configured display name attribute value
	*
	* @return array User attributes
	* @see self::ldap()
	*/
	public static function folder_id2user($folder_id, $as_string = false)
	{
	static $domain, $cache, $name_attr;

	$rcube = rcube::get_instance();

	if ($domain === null) {
	list(, $domain) = explode('@', $rcube->get_user_name());
	}

	if ($name_attr === null) {
	$name_attr = (array) ($rcube->config->get('kolab_users_name_field', $rcube->config->get('kolab_auth_name')) ?: 'name');
	}

	$token = $folder_id;
	if ($domain && strpos($token, '@') === false) {
	$token .= '@' . $domain;
	}

	if ($cache === null) {
	$cache = $rcube->get_cache_shared('kolab_users') ?: false;
	}

	// use value cached in memory for repeated lookups
	if (!$cache && array_key_exists($token, self::$ldapcache)) {
	$user = self::$ldapcache[$token];
	}

	if (empty($user) && $cache) {
	$user = $cache->get($token);
	}

	if (empty($user) && ($ldap = self::ldap())) {
	$user = $ldap->get_user_record($token, $_SESSION['imap_host']);

	if (!empty($user)) {
	$keys = array('displayname', 'name', 'mail'); // supported keys
	$user = array_intersect_key($user, array_flip($keys));

	if (!empty($user)) {
	if ($cache) {
	$cache->set($token, $user);
	}
	else {
	self::$ldapcache[$token] = $user;
	}
	}
	}
	}

	if (!empty($user)) {
	if ($as_string) {
	foreach ($name_attr as $attr) {
	if ($display = $user[$attr]) {
	break;
	}
	}

	if (!$display) {
	$display = $user['displayname'] ?: $user['name'];
	}

	if ($display && $display != $folder_id) {
	$display = "$display ($folder_id)";
	}

	return $display;
	}

	return $user;
	}
	}

	/**
	* Chwala's 'folder_mod' hook handler for mapping other users folder names
	*/
	public static function folder_mod($args)
	{
	static $roots;

	if ($roots === null) {
	self::setup();
	$roots = self::$imap->get_namespace('other');
	}

	// Note: We're working with UTF7-IMAP encoding here

	if ($args['dir'] == 'in') {
	foreach ((array) $roots as $root) {
	if (strpos($args['folder'], $root[0]) === 0) {
	// remove root and explode folder
	$delim = $root[1];
	$folder = explode($delim, substr($args['folder'], strlen($root[0])));
	// compare first (user) part with a regexp, it's supposed
	// to look like this: "Doe, Jane (uid)", so we can extract the uid
	// and replace the folder with it
	if (preg_match('~^[^/]+ $([^)]+)$$~', $folder[0], $m)) {
	$folder[0] = $m[1];
	$args['folder'] = $root[0] . implode($delim, $folder);
	}

	break;
	}
	}
	}
	else { // dir == 'out'
	foreach ((array) $roots as $root) {
	if (strpos($args['folder'], $root[0]) === 0) {
	// remove root and explode folder
	$delim = $root[1];
	$folder = explode($delim, substr($args['folder'], strlen($root[0])));

	// Replace uid with "Doe, Jane (uid)"
	if ($user = self::folder_id2user($folder[0], true)) {
	$user = str_replace($delim, '', $user);
	$folder[0] = rcube_charset::convert($user, RCUBE_CHARSET, 'UTF7-IMAP');

	$args['folder'] = $root[0] . implode($delim, $folder);
	}

	break;
	}
	}
	}

	return $args;
	}
	}

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