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	diff --git a/plugins/libkolab/lib/kolab_storage.php b/plugins/libkolab/lib/kolab_storage.php
	index ebfddcb7..0f81cec3 100644
	--- a/plugins/libkolab/lib/kolab_storage.php
	+++ b/plugins/libkolab/lib/kolab_storage.php
	@@ -1,1026 +1,1032 @@
	<?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, 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';

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

	private static $ready = false;
	private static $subscriptions;
	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::$ready) {
	// set imap options
	self::$imap->set_options(array(
	'skip_deleted' => true,
	'threading' => false,
	));
	self::$imap->set_pagesize(9999);
	}
	else if (!class_exists('kolabformat')) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "required kolabformat module not found"
	), true);
	}
	else {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "IMAP server doesn't support METADATA or ANNOTATEMORE"
	), true);
	}

	return self::$ready;
	}


	/**
	* 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)
	*
	* @return array List of Kolab_Folder objects (folder names in UTF7-IMAP)
	*/
	public static function get_folders($type)
	{
	$folders = $folderdata = array();

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

	return null;
	}


	/**
	* Getter for a specific storage folder
	*
	* @param string IMAP folder to access (UTF7-IMAP)
	* @return object kolab_storage_folder The folder object
	*/
	public static function get_folder($folder)
	{
	return self::setup() ? new kolab_storage_folder($folder) : 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,distribution-list,event,task,note)
	* @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) as $foldername) {
	if (!$folder)
	$folder = new kolab_storage_folder($foldername);
	else
	$folder->set_folder($foldername);

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

	return false;
	}


	/**
	*
	*/
	public static function get_freebusy_server()
	{
	return unslashify(self::$config->get('kolab_freebusy_server', 'https://' . $_SESSION['imap_host'] . '/freebusy'));
	}


	/**
	* Compose an URL to query the free/busy status for the given user
	*/
	public static function get_freebusy_url($email)
	{
	return self::get_freebusy_server() . '/' . $email . '.ifb';
	}


	/**
	* Creates folder ID from folder name
	*
	* @param string $folder Folder name (UTF7-IMAP)
	*
	* @return string Folder ID string
	*/
	public static function folder_id($folder)
	{
	return asciiwords(strtr($folder, '/.-', '___'));
	}


	/**
	* 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();

	$success = self::$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();

	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();

	+ $oldfolder = self::get_folder($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 && $active) {
	self::set_state($oldnam, 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 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 mixed New folder name or False on failure
	*/
	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($options) && ($options['protected'] \|\| $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)
	* 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)
	{
	self::setup();

	// find custom display name in folder METADATA
	if (self::$config->get('kolab_custom_display_names', true)) {
	$metadata = self::$imap->get_metadata($folder, array(self::NAME_KEY_PRIVATE, self::NAME_KEY_SHARED));
	if (($name = $metadata[$folder][self::NAME_KEY_PRIVATE]) \|\| ($name = $metadata[$folder][self::NAME_KEY_SHARED])) {
	return $name;
	}
	}

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

	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
	$folder = substr($folder, strlen($ns[0]));
	$delim = $ns[1];
	// get username
	$pos = strpos($folder, $delim);
	if ($pos) {
	$prefix = '('.substr($folder, 0, $pos).') ';
	$folder = substr($folder, $pos+1);
	}
	else {
	$prefix = '('.$folder.')';
	$folder = '';
	}
	$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;

	if (!$folder_ns)
	$folder_ns = 'personal';

	return $folder;
	}


	/**
	* Helper method to generate a truncated folder name to display
	*/
	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));
	$name = str_repeat('  ', $count-1) . '» ' . substr($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
	$folders = self::get_folders($type);

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

	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 && ($name == $current \|\| strpos($name, $current.$delim) === 0)) {
	continue;
	}

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

	$names[$name] = self::object_name($name);
	}

	// 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);
	}

	// Sort folders list
	asort($names, SORT_LOCALE_STRING);

	// 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,distribution-list,event,task,note,mail)
	* @param boolean 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) {
	return self::$imap->list_folders_subscribed($root, $mbox);
	}
	else {
	return self::$imap->list_folders($root, $mbox);
	}
	}

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

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

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

	// In some conditions we can skip LIST command (?)
	if (!$subscribed && $filter != 'mail' && $prefix == '*') {
	foreach ($folderdata as $folder => $type) {
	if (!preg_match($regexp, $type)) {
	unset($folderdata[$folder]);
	}
	}
	return array_keys($folderdata);
	}

	// Get folders list
	if ($subscribed) {
	$folders = self::$imap->list_folders_subscribed($root, $mbox);
	}
	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];

	if ($filter == 'mail' && empty($type)) {
	continue;
	}
	if (empty($type) \|\| !preg_match($regexp, $type)) {
	unset($folders[$idx]);
	}
	}

	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)
	{
	$nsnames = array('personal' => array(), 'shared' => array(), 'other' => array());
	foreach ($folders as $folder) {
	$folders[$folder->name] = $folder;
	$ns = $folder->get_namespace();
	$nsnames[$ns][$folder->name] = strtolower(html_entity_decode(self::object_name($folder->name, $ns), ENT_COMPAT, RCUBE_CHARSET)); // decode »
	}

	$names = array();
	foreach ($nsnames as $ns => $dummy) {
	asort($nsnames[$ns], SORT_LOCALE_STRING);
	$names += $nsnames[$ns];
	}

	$out = array();
	foreach ($names as $utf7name => $name) {
	$out[] = $folders[$utf7name];
	}

	return $out;
	}


	/**
	* 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;
	}

	$folderdata = self::$imap->get_metadata($prefix, array(self::CTYPE_KEY, self::CTYPE_KEY_PRIVATE));

	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, $suffix) = 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 $type Content type
	*
	* @return boolean True on success
	*/
	public static function set_folder_type($folder, $type='mail')
	{
	self::setup();

	list($ctype, $subtype) = explode('.', $type);

	$success = self::$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 $folder Folder name
	*
	* @return boolean True if subscribed, false if not
	*/
	public static function folder_is_subscribed($folder)
	{
	if (self::$subscriptions === null) {
	self::setup();
	self::$subscriptions = self::$imap->list_folders_subscribed();
	}

	return in_array($folder, self::$subscriptions);
	}


	/**
	* Change subscription status of this folder
	*
	* @param string $folder Folder name
	*
	* @return True on success, false on error
	*/
	public static function folder_subscribe($folder)
	{
	self::setup();

	if (self::$imap->subscribe($folder)) {
	self::$subscriptions === null;
	return true;
	}

	return false;
	}


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

	if (self::$imap->unsubscribe($folder)) {
	self::$subscriptions === null;
	return true;
	}

	return false;
	}


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

	return in_array($folder, $active_folders);
	}


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


	/**
	* Change activation status of this folder
	*
	* @param string $folder Folder name
	*
	* @return True on success, false on error
	*/
	public static function folder_deactivate($folder)
	{
	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::$subscriptions = self::$imap->list_folders_subscribed();
	}
	self::$states = self::$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, '**');
	$rcube = rcube::get_instance();
	return $rcube->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 ($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::$imap->folder_create($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 $prop Folder properties
	*/
	public static function set_folder_props($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
	}
	}
	}

	}
	diff --git a/plugins/libkolab/lib/kolab_storage_cache.php b/plugins/libkolab/lib/kolab_storage_cache.php
	index ba6c1065..a23fbaa0 100644
	--- a/plugins/libkolab/lib/kolab_storage_cache.php
	+++ b/plugins/libkolab/lib/kolab_storage_cache.php
	@@ -1,768 +1,785 @@
	<?php

	/**
	* Kolab storage cache class providing a local caching layer for Kolab groupware objects.
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2012, 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_cache
	{
	private $db;
	private $imap;
	private $folder;
	private $uid2msg;
	private $objects;
	private $index = array();
	private $resource_uri;
	private $enabled = true;
	private $synched = false;
	private $synclock = false;
	private $ready = false;
	private $max_sql_packet;
	private $max_sync_lock_time = 600;
	private $binary_items = array(
	'photo' => '\|<photo><uri>[^;]+;base64,([^<]+)</uri></photo>\|i',
	'pgppublickey' => '\|<key><uri>date:application/pgp-keys;base64,([^<]+)</uri></photo>\|i',
	'pkcs7publickey' => '\|<key><uri>date:application/pkcs7-mime;base64,([^<]+)</uri></photo>\|i',
	);


	/**
	* Default constructor
	*/
	public function __construct(kolab_storage_folder $storage_folder = null)
	{
	$rcmail = rcube::get_instance();
	$this->db = $rcmail->get_dbh();
	$this->imap = $rcmail->get_storage();
	$this->enabled = $rcmail->config->get('kolab_cache', false);

	if ($this->enabled) {
	// remove sync-lock on script termination
	$rcmail->add_shutdown_function(array($this, '_sync_unlock'));
	}

	if ($storage_folder)
	$this->set_folder($storage_folder);
	}


	/**
	* Connect cache with a storage folder
	*
	* @param kolab_storage_folder The storage folder instance to connect with
	*/
	public function set_folder(kolab_storage_folder $storage_folder)
	{
	$this->folder = $storage_folder;

	if (empty($this->folder->name)) {
	$this->ready = false;
	return;
	}

	// compose fully qualified ressource uri for this instance
	$this->resource_uri = $this->folder->get_resource_uri();
	$this->ready = $this->enabled;
	}


	/**
	* Synchronize local cache data with remote
	*/
	public function synchronize()
	{
	// only sync once per request cycle
	if ($this->synched)
	return;

	// increase time limit
	@set_time_limit($this->max_sync_lock_time);

	// lock synchronization for this folder or wait if locked
	$this->_sync_lock();

	// synchronize IMAP mailbox cache
	$this->imap->folder_sync($this->folder->name);

	// compare IMAP index with object cache index
	$imap_index = $this->imap->index($this->folder->name);
	$this->index = $imap_index->get();

	// determine objects to fetch or to invalidate
	if ($this->ready) {
	// read cache index
	$sql_result = $this->db->query(
	"SELECT msguid, uid FROM kolab_cache WHERE resource=? AND type<>?",
	$this->resource_uri,
	'lock'
	);

	$old_index = array();
	while ($sql_arr = $this->db->fetch_assoc($sql_result)) {
	$old_index[] = $sql_arr['msguid'];
	$this->uid2msg[$sql_arr['uid']] = $sql_arr['msguid'];
	}

	// fetch new objects from imap
	foreach (array_diff($this->index, $old_index) as $msguid) {
	if ($object = $this->folder->read_object($msguid, '*')) {
	$this->_extended_insert($msguid, $object);
	}
	}
	$this->_extended_insert(0, null);

	// delete invalid entries from local DB
	$del_index = array_diff($old_index, $this->index);
	if (!empty($del_index)) {
	$quoted_ids = join(',', array_map(array($this->db, 'quote'), $del_index));
	$this->db->query(
	"DELETE FROM kolab_cache WHERE resource=? AND msguid IN ($quoted_ids)",
	$this->resource_uri
	);
	}
	}

	// remove lock
	$this->_sync_unlock();

	$this->synched = time();
	}


	/**
	* Read a single entry from cache or from IMAP directly
	*
	* @param string Related IMAP message UID
	* @param string Object type to read
	* @param string IMAP folder name the entry relates to
	* @param array Hash array with object properties or null if not found
	*/
	public function get($msguid, $type = null, $foldername = null)
	{
	// delegate to another cache instance
	if ($foldername && $foldername != $this->folder->name) {
	return kolab_storage::get_folder($foldername)->cache->get($msguid, $type);
	}

	// load object if not in memory
	if (!isset($this->objects[$msguid])) {
	if ($this->ready) {
	$sql_result = $this->db->query(
	"SELECT * FROM kolab_cache ".
	"WHERE resource=? AND type=? AND msguid=?",
	$this->resource_uri,
	$type ?: $this->folder->type,
	$msguid
	);

	if ($sql_arr = $this->db->fetch_assoc($sql_result)) {
	$this->objects[$msguid] = $this->_unserialize($sql_arr);
	}
	}

	// fetch from IMAP if not present in cache
	if (empty($this->objects[$msguid])) {
	$result = $this->_fetch(array($msguid), $type, $foldername);
	$this->objects[$msguid] = $result[0];
	}
	}

	return $this->objects[$msguid];
	}


	/**
	* Insert/Update a cache entry
	*
	* @param string Related IMAP message UID
	* @param mixed Hash array with object properties to save or false to delete the cache entry
	* @param string IMAP folder name the entry relates to
	*/
	public function set($msguid, $object, $foldername = null)
	{
	if (!$msguid) {
	return;
	}

	// delegate to another cache instance
	if ($foldername && $foldername != $this->folder->name) {
	kolab_storage::get_folder($foldername)->cache->set($msguid, $object);
	return;
	}

	// remove old entry
	if ($this->ready) {
	$this->db->query("DELETE FROM kolab_cache WHERE resource=? AND msguid=? AND type<>?",
	$this->resource_uri, $msguid, 'lock');
	}

	if ($object) {
	// insert new object data...
	$this->insert($msguid, $object);
	}
	else {
	// ...or set in-memory cache to false
	$this->objects[$msguid] = $object;
	}
	}


	/**
	* Insert a cache entry
	*
	* @param string Related IMAP message UID
	* @param mixed Hash array with object properties to save or false to delete the cache entry
	*/
	public function insert($msguid, $object)
	{
	// write to cache
	if ($this->ready) {
	$sql_data = $this->_serialize($object);
	$objtype = $object['_type'] ? $object['_type'] : $this->folder->type;

	$result = $this->db->query(
	"INSERT INTO kolab_cache ".
	" (resource, type, msguid, uid, created, changed, data, xml, dtstart, dtend, tags, words, filename)".
	" VALUES (?, ?, ?, ?, " . $this->db->now() . ", ?, ?, ?, ?, ?, ?, ?, ?)",
	$this->resource_uri,
	$objtype,
	$msguid,
	$object['uid'],
	$sql_data['changed'],
	$sql_data['data'],
	$sql_data['xml'],
	$sql_data['dtstart'],
	$sql_data['dtend'],
	$sql_data['tags'],
	$sql_data['words'],
	$sql_data['filename']
	);

	if (!$this->db->affected_rows($result)) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "Failed to write to kolab cache"
	), true);
	}
	}

	// keep a copy in memory for fast access
	$this->objects[$msguid] = $object;
	$this->uid2msg[$object['uid']] = $msguid;
	}


	/**
	* Move an existing cache entry to a new resource
	*
	* @param string Entry's IMAP message UID
	* @param string Entry's Object UID
	* @param string Target IMAP folder to move it to
	*/
	public function move($msguid, $uid, $target_folder)
	{
	$target = kolab_storage::get_folder($target_folder);

	// resolve new message UID in target folder
	if ($new_msguid = $target->cache->uid2msguid($uid)) {
	$this->db->query(
	"UPDATE kolab_cache SET resource=?, msguid=? ".
	"WHERE resource=? AND msguid=? AND type<>?",
	$target->get_resource_uri(),
	$new_msguid,
	$this->resource_uri,
	$msguid,
	'lock'
	);
	}
	else {
	// just clear cache entry
	$this->set($msguid, false);
	}

	unset($this->uid2msg[$uid]);
	}


	/**
	* Remove all objects from local cache
	*/
	public function purge($type = null)
	{
	$result = $this->db->query(
	"DELETE FROM kolab_cache WHERE resource=?".
	($type ? ' AND type=?' : ''),
	$this->resource_uri,
	$type
	);
	return $this->db->affected_rows($result);
	}

	+ /**
	+ * Update resource URI for existing cache entries
	+ *
	+ * @param string Target IMAP folder to move it to
	+ */
	+ public function rename($new_folder)
	+ {
	+ $target = kolab_storage::get_folder($new_folder);
	+
	+ // resolve new message UID in target folder
	+ $this->db->query(
	+ "UPDATE kolab_cache SET resource=? ".
	+ "WHERE resource=?",
	+ $target->get_resource_uri(),
	+ $this->resource_uri
	+ );
	+ }

	/**
	* Select Kolab objects filtered by the given query
	*
	* @param array Pseudo-SQL query as list of filter parameter triplets
	* triplet: array('<colname>', '<comparator>', '<value>')
	* @param boolean Set true to only return UIDs instead of complete objects
	* @return array List of Kolab data objects (each represented as hash array) or UIDs
	*/
	public function select($query = array(), $uids = false)
	{
	$result = array();

	// read from local cache DB (assume it to be synchronized)
	if ($this->ready) {
	$sql_result = $this->db->query(
	"SELECT " . ($uids ? 'msguid, uid' : '*') . " FROM kolab_cache ".
	"WHERE resource=? " . $this->_sql_where($query),
	$this->resource_uri
	);

	while ($sql_arr = $this->db->fetch_assoc($sql_result)) {
	if ($uids) {
	$this->uid2msg[$sql_arr['uid']] = $sql_arr['msguid'];
	$result[] = $sql_arr['uid'];
	}
	else if ($object = $this->_unserialize($sql_arr)) {
	$result[] = $object;
	}
	}
	}
	else {
	// extract object type from query parameter
	$filter = $this->_query2assoc($query);

	// use 'list' for folder's default objects
	if ($filter['type'] == $this->type) {
	$index = $this->index;
	}
	else { // search by object type
	$search = 'UNDELETED HEADER X-Kolab-Type ' . kolab_format::KTYPE_PREFIX . $filter['type'];
	$index = $this->imap->search_once($this->folder->name, $search)->get();
	}

	// fetch all messages in $index from IMAP
	$result = $uids ? $this->_fetch_uids($index, $filter['type']) : $this->_fetch($index, $filter['type']);

	// TODO: post-filter result according to query
	}

	// We don't want to cache big results in-memory, however
	// if we select only one object here, there's a big chance we will need it later
	if (!$uids && count($result) == 1) {
	if ($msguid = $result[0]['_msguid']) {
	$this->uid2msg[$result[0]['uid']] = $msguid;
	$this->objects[$msguid] = $result[0];
	}
	}

	return $result;
	}


	/**
	* Get number of objects mathing the given query
	*
	* @param array $query Pseudo-SQL query as list of filter parameter triplets
	* @return integer The number of objects of the given type
	*/
	public function count($query = array())
	{
	$count = 0;

	// cache is in sync, we can count records in local DB
	if ($this->synched) {
	$sql_result = $this->db->query(
	"SELECT COUNT(*) AS numrows FROM kolab_cache ".
	"WHERE resource=? " . $this->_sql_where($query),
	$this->resource_uri
	);

	$sql_arr = $this->db->fetch_assoc($sql_result);
	$count = intval($sql_arr['numrows']);
	}
	else {
	// search IMAP by object type
	$filter = $this->_query2assoc($query);
	$ctype = kolab_format::KTYPE_PREFIX . $filter['type'];
	$index = $this->imap->search_once($this->folder->name, 'UNDELETED HEADER X-Kolab-Type ' . $ctype);
	$count = $index->count();
	}

	return $count;
	}


	/**
	* Helper method to compose a valid SQL query from pseudo filter triplets
	*/
	private function _sql_where($query)
	{
	$sql_where = '';
	foreach ($query as $param) {
	if (is_array($param[0])) {
	$subq = array();
	foreach ($param[0] as $q) {
	$subq[] = preg_replace('/^\s*AND\s+/i', '', $this->_sql_where(array($q)));
	}
	if (!empty($subq)) {
	$sql_where .= ' AND (' . implode($param[1] == 'OR' ? ' OR ' : ' AND ', $subq) . ')';
	}
	continue;
	}
	else if ($param[1] == '=' && is_array($param[2])) {
	$qvalue = '(' . join(',', array_map(array($this->db, 'quote'), $param[2])) . ')';
	$param[1] = 'IN';
	}
	else if ($param[1] == '~' \|\| $param[1] == 'LIKE' \|\| $param[1] == '!~' \|\| $param[1] == '!LIKE') {
	$not = ($param[1] == '!~' \|\| $param[1] == '!LIKE') ? 'NOT ' : '';
	$param[1] = $not . 'LIKE';
	$qvalue = $this->db->quote('%'.preg_replace('/(^\^\|\$$)/', ' ', $param[2]).'%');
	}
	else if ($param[0] == 'tags') {
	$param[1] = 'LIKE';
	$qvalue = $this->db->quote('% '.$param[2].' %');
	}
	else {
	$qvalue = $this->db->quote($param[2]);
	}

	$sql_where .= sprintf(' AND %s %s %s',
	$this->db->quote_identifier($param[0]),
	$param[1],
	$qvalue
	);
	}

	return $sql_where;
	}

	/**
	* Helper method to convert the given pseudo-query triplets into
	* an associative filter array with 'equals' values only
	*/
	private function _query2assoc($query)
	{
	// extract object type from query parameter
	$filter = array();
	foreach ($query as $param) {
	if ($param[1] == '=')
	$filter[$param[0]] = $param[2];
	}
	return $filter;
	}

	/**
	* Fetch messages from IMAP
	*
	* @param array List of message UIDs to fetch
	* @param string Requested object type or * for all
	* @param string IMAP folder to read from
	* @return array List of parsed Kolab objects
	*/
	private function _fetch($index, $type = null, $folder = null)
	{
	$results = array();
	foreach ((array)$index as $msguid) {
	if ($object = $this->folder->read_object($msguid, $type, $folder)) {
	$results[] = $object;
	$this->set($msguid, $object);
	}
	}

	return $results;
	}


	/**
	* Fetch object UIDs (aka message subjects) from IMAP
	*
	* @param array List of message UIDs to fetch
	* @param string Requested object type or * for all
	* @param string IMAP folder to read from
	* @return array List of parsed Kolab objects
	*/
	private function _fetch_uids($index, $type = null)
	{
	if (!$type)
	$type = $this->folder->type;

	$results = array();
	foreach ((array)$this->imap->fetch_headers($this->folder->name, $index, false) as $msguid => $headers) {
	$object_type = kolab_format::mime2object_type($headers->others['x-kolab-type']);

	// check object type header and abort on mismatch
	if ($type != '*' && $object_type != $type)
	return false;

	$uid = $headers->subject;
	$this->uid2msg[$uid] = $msguid;
	$results[] = $uid;
	}

	return $results;
	}


	/**
	* Helper method to convert the given Kolab object into a dataset to be written to cache
	*/
	private function _serialize($object)
	{
	$sql_data = array('changed' => null, 'dtstart' => null, 'dtend' => null, 'xml' => '', 'tags' => '', 'words' => '');
	$objtype = $object['_type'] ? $object['_type'] : $this->folder->type;

	// set type specific values
	if ($objtype == 'event') {
	// database runs in server's timezone so using date() is what we want
	$sql_data['dtstart'] = date('Y-m-d H:i:s', is_object($object['start']) ? $object['start']->format('U') : $object['start']);
	$sql_data['dtend'] = date('Y-m-d H:i:s', is_object($object['end']) ? $object['end']->format('U') : $object['end']);

	// extend date range for recurring events
	if ($object['recurrence'] && $object['_formatobj']) {
	$recurrence = new kolab_date_recurrence($object['_formatobj']);
	$sql_data['dtend'] = date('Y-m-d 23:59:59', $recurrence->end() ?: strtotime('now +1 year'));
	}
	}
	else if ($objtype == 'task') {
	if ($object['start'])
	$sql_data['dtstart'] = date('Y-m-d H:i:s', is_object($object['start']) ? $object['start']->format('U') : $object['start']);
	if ($object['due'])
	$sql_data['dtend'] = date('Y-m-d H:i:s', is_object($object['due']) ? $object['due']->format('U') : $object['due']);
	}
	else if ($objtype == 'file') {
	if (!empty($object['_attachments'])) {
	reset($object['_attachments']);
	$sql_data['filename'] = $object['_attachments'][key($object['_attachments'])]['name'];
	}
	}

	if ($object['changed']) {
	$sql_data['changed'] = date('Y-m-d H:i:s', is_object($object['changed']) ? $object['changed']->format('U') : $object['changed']);
	}

	if ($object['_formatobj']) {
	$sql_data['xml'] = preg_replace('!(</?[a-z0-9:-]+>)[\n\r\t\s]+!ms', '$1', (string)$object['_formatobj']->write(3.0));
	$sql_data['tags'] = ' ' . join(' ', $object['_formatobj']->get_tags()) . ' '; // pad with spaces for strict/prefix search
	$sql_data['words'] = ' ' . join(' ', $object['_formatobj']->get_words()) . ' ';
	}

	// extract object data
	$data = array();
	foreach ($object as $key => $val) {
	// skip empty properties
	if ($val === "" \|\| $val === null) {
	continue;
	}
	// mark binary data to be extracted from xml on unserialize()
	if (isset($this->binary_items[$key])) {
	$data[$key] = true;
	}
	else if ($key[0] != '_') {
	$data[$key] = $val;
	}
	else if ($key == '_attachments') {
	foreach ($val as $k => $att) {
	unset($att['content'], $att['path']);
	if ($att['id'])
	$data[$key][$k] = $att;
	}
	}
	}

	$sql_data['data'] = serialize($data);
	return $sql_data;
	}

	/**
	* Helper method to turn stored cache data into a valid storage object
	*/
	private function _unserialize($sql_arr)
	{
	$object = unserialize($sql_arr['data']);

	// decode binary properties
	foreach ($this->binary_items as $key => $regexp) {
	if (!empty($object[$key]) && preg_match($regexp, $sql_arr['xml'], $m)) {
	$object[$key] = base64_decode($m[1]);
	}
	}

	// add meta data
	$object['_type'] = $sql_arr['type'];
	$object['_msguid'] = $sql_arr['msguid'];
	$object['_mailbox'] = $this->folder->name;
	$object['_size'] = strlen($sql_arr['xml']);
	$object['_formatobj'] = kolab_format::factory($sql_arr['type'], 3.0, $sql_arr['xml']);

	return $object;
	}

	/**
	* Write records into cache using extended inserts to reduce the number of queries to be executed
	*
	* @param int Message UID. Set 0 to commit buffered inserts
	* @param array Kolab object to cache
	*/
	private function _extended_insert($msguid, $object)
	{
	static $buffer = '';

	$line = '';
	if ($object) {
	$sql_data = $this->_serialize($object);
	$objtype = $object['_type'] ? $object['_type'] : $this->folder->type;

	$values = array(
	$this->db->quote($this->resource_uri),
	$this->db->quote($objtype),
	$this->db->quote($msguid),
	$this->db->quote($object['uid']),
	$this->db->now(),
	$this->db->quote($sql_data['changed']),
	$this->db->quote($sql_data['data']),
	$this->db->quote($sql_data['xml']),
	$this->db->quote($sql_data['dtstart']),
	$this->db->quote($sql_data['dtend']),
	$this->db->quote($sql_data['tags']),
	$this->db->quote($sql_data['words']),
	$this->db->quote($sql_data['filename']),
	);
	$line = '(' . join(',', $values) . ')';
	}

	if ($buffer && (!$msguid \|\| (strlen($buffer) + strlen($line) > $this->max_sql_packet()))) {
	$result = $this->db->query(
	"INSERT INTO kolab_cache ".
	" (resource, type, msguid, uid, created, changed, data, xml, dtstart, dtend, tags, words, filename)".
	" VALUES $buffer"
	);
	if (!$this->db->affected_rows($result)) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'message' => "Failed to write to kolab cache"
	), true);
	}

	$buffer = '';
	}

	$buffer .= ($buffer ? ',' : '') . $line;
	}

	/**
	* Returns max_allowed_packet from mysql config
	*/
	private function max_sql_packet()
	{
	if (!$this->max_sql_packet) {
	// mysql limit or max 4 MB
	$value = $this->db->get_variable('max_allowed_packet', 1048500);
	$this->max_sql_packet = min($value, 410241024) - 2000;
	}

	return $this->max_sql_packet;
	}

	/**
	* Check lock record for this folder and wait if locked or set lock
	*/
	private function _sync_lock()
	{
	if (!$this->ready)
	return;

	$sql_query = "SELECT msguid AS locked, ".$this->db->unixtimestamp('created')." AS created FROM kolab_cache ".
	"WHERE resource=? AND type=?";
	$sql_arr = $this->db->fetch_assoc($this->db->query($sql_query, $this->resource_uri, 'lock'));

	// abort if database is not set-up
	if ($this->db->is_error()) {
	$this->ready = false;
	return;
	}

	$this->synclock = true;

	// wait if locked (expire locks after 10 minutes)
	while ($sql_arr && intval($sql_arr['locked']) > 0 && $sql_arr['created'] + $this->max_sync_lock_time > time()) {
	usleep(500000);
	$sql_arr = $this->db->fetch_assoc($this->db->query($sql_query, $this->resource_uri, 'lock'));
	}

	// create lock record if not exists
	if (!$sql_arr) {
	$this->db->query(
	"INSERT INTO kolab_cache (resource, type, msguid, created, uid, data, xml, tags, words)".
	" VALUES (?, ?, 1, " . $this->db->now() . ", '', '', '', '', '')",
	$this->resource_uri,
	'lock'
	);
	}
	else {
	$this->db->query(
	"UPDATE kolab_cache SET msguid = 1, created = " . $this->db->now() .
	" WHERE resource = ? AND type = ?",
	$this->resource_uri,
	'lock'
	);
	}
	}

	/**
	* Remove lock for this folder
	*/
	public function _sync_unlock()
	{
	if (!$this->ready \|\| !$this->synclock)
	return;

	$this->db->query(
	"UPDATE kolab_cache SET msguid = 0 WHERE resource = ? AND type = ?",
	$this->resource_uri,
	'lock'
	);

	$this->synclock = false;
	}

	/**
	* Resolve an object UID into an IMAP message UID
	*
	* @param string Kolab object UID
	* @param boolean Include deleted objects
	* @return int The resolved IMAP message UID
	*/
	public function uid2msguid($uid, $deleted = false)
	{
	if (!isset($this->uid2msg[$uid])) {
	// use IMAP SEARCH to get the right message
	$index = $this->imap->search_once($this->folder->name, ($deleted ? '' : 'UNDELETED ') .
	'HEADER SUBJECT ' . rcube_imap_generic::escape($uid));
	$results = $index->get();
	$this->uid2msg[$uid] = $results[0];
	}

	return $this->uid2msg[$uid];
	}

	}

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