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	diff --git a/plugins/libkolab/lib/kolab_storage_folder.php b/plugins/libkolab/lib/kolab_storage_folder.php
	index d9c79d5f..0e728a36 100644
	--- a/plugins/libkolab/lib/kolab_storage_folder.php
	+++ b/plugins/libkolab/lib/kolab_storage_folder.php
	@@ -1,1131 +1,1133 @@
	<?php

	/**
	* The kolab_storage_folder class represents an IMAP folder on the Kolab server.
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2012-2013, 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_folder extends kolab_storage_folder_api
	{
	/**
	* The kolab_storage_cache instance for caching operations
	* @var object
	*/
	public $cache;

	/**
	* Indicate validity status
	* @var boolean
	*/
	public $valid = false;

	private $resource_uri;


	/**
	* Default constructor
	*
	* @param string The folder name/path
	* @param string Expected folder type
	*/
	function __construct($name, $type = null, $type_annotation = null)
	{
	parent::__construct($name);
	$this->imap->set_options(array('skip_deleted' => true));
	$this->set_folder($name, $type);
	}


	/**
	* Set the IMAP folder this instance connects to
	*
	* @param string The folder name/path
	* @param string Expected folder type
	* @param string Optional folder type if known
	*/
	public function set_folder($name, $type = null, $type_annotation = null)
	{
	if (empty($type_annotation)) {
	$type_annotation = kolab_storage::folder_type($name);
	}

	$oldtype = $this->type;
	list($this->type, $suffix) = explode('.', $type_annotation);
	$this->default = $suffix == 'default';
	$this->subtype = $this->default ? '' : $suffix;
	$this->name = $name;
	$this->id = kolab_storage::folder_id($name);
	$this->valid = !empty($this->type) && $this->type != 'mail' && (!$type \|\| $this->type == $type);

	// reset cached object properties
	$this->owner = $this->namespace = $this->resource_uri = $this->info = $this->idata = null;

	// get a new cache instance if folder type changed
	if (!$this->cache \|\| $this->type != $oldtype)
	$this->cache = kolab_storage_cache::factory($this);
	+ else
	+ $this->cache->set_folder($this);

	$this->imap->set_folder($this->name);
	}


	/**
	* Compose a unique resource URI for this IMAP folder
	*/
	public function get_resource_uri()
	{
	if (!empty($this->resource_uri))
	return $this->resource_uri;

	// strip namespace prefix from folder name
	$ns = $this->get_namespace();
	$nsdata = $this->imap->get_namespace($ns);
	if (is_array($nsdata[0]) && strlen($nsdata[0][0]) && strpos($this->name, $nsdata[0][0]) === 0) {
	$subpath = substr($this->name, strlen($nsdata[0][0]));
	if ($ns == 'other') {
	list($user, $suffix) = explode($nsdata[0][1], $subpath, 2);
	$subpath = $suffix;
	}
	}
	else {
	$subpath = $this->name;
	}

	// compose fully qualified ressource uri for this instance
	$this->resource_uri = 'imap://' . urlencode($this->get_owner(true)) . '@' . $this->imap->options['host'] . '/' . $subpath;
	return $this->resource_uri;
	}

	/**
	* Helper method to extract folder UID metadata
	*
	* @return string Folder's UID
	*/
	public function get_uid()
	{
	// UID is defined in folder METADATA
	$metakeys = array(kolab_storage::UID_KEY_SHARED, kolab_storage::UID_KEY_PRIVATE, kolab_storage::UID_KEY_CYRUS);
	$metadata = $this->get_metadata($metakeys);
	foreach ($metakeys as $key) {
	if (($uid = $metadata[$key])) {
	return $uid;
	}
	}

	// generate a folder UID and set it to IMAP
	$uid = rtrim(chunk_split(md5($this->name . $this->get_owner() . uniqid('-', true)), 12, '-'), '-');
	if ($this->set_uid($uid)) {
	return $uid;
	}

	// create hash from folder name if we can't write the UID metadata
	return md5($this->name . $this->get_owner());
	}

	/**
	* Helper method to set an UID value to the given IMAP folder instance
	*
	* @param string Folder's UID
	* @return boolean True on succes, False on failure
	*/
	public function set_uid($uid)
	{
	if (!($success = $this->set_metadata(array(kolab_storage::UID_KEY_SHARED => $uid)))) {
	$success = $this->set_metadata(array(kolab_storage::UID_KEY_PRIVATE => $uid));
	}
	return $success;
	}

	/**
	* Compose a folder Etag identifier
	*/
	public function get_ctag()
	{
	$fdata = $this->get_imap_data();
	return sprintf('%d-%d-%d', $fdata['UIDVALIDITY'], $fdata['HIGHESTMODSEQ'], $fdata['UIDNEXT']);
	}

	/**
	* Check activation status of this folder
	*
	* @return boolean True if enabled, false if not
	*/
	public function is_active()
	{
	return kolab_storage::folder_is_active($this->name);
	}

	/**
	* Change activation status of this folder
	*
	* @param boolean The desired subscription status: true = active, false = not active
	*
	* @return True on success, false on error
	*/
	public function activate($active)
	{
	return $active ? kolab_storage::folder_activate($this->name) : kolab_storage::folder_deactivate($this->name);
	}

	/**
	* Check subscription status of this folder
	*
	* @return boolean True if subscribed, false if not
	*/
	public function is_subscribed()
	{
	return kolab_storage::folder_is_subscribed($this->name);
	}

	/**
	* Change subscription status of this folder
	*
	* @param boolean The desired subscription status: true = subscribed, false = not subscribed
	*
	* @return True on success, false on error
	*/
	public function subscribe($subscribed)
	{
	return $subscribed ? kolab_storage::folder_subscribe($this->name) : kolab_storage::folder_unsubscribe($this->name);
	}

	/**
	* Get number of objects stored in this folder
	*
	* @param mixed Pseudo-SQL query as list of filter parameter triplets
	* or string with object type (e.g. contact, event, todo, journal, note, configuration)
	* @return integer The number of objects of the given type
	* @see self::select()
	*/
	public function count($query = null)
	{
	if (!$this->valid) {
	return 0;
	}

	// synchronize cache first
	$this->cache->synchronize();

	return $this->cache->count($this->_prepare_query($query));
	}


	/**
	* List all Kolab objects of the given type
	*
	* @param string $type Object type (e.g. contact, event, todo, journal, note, configuration)
	* @return array List of Kolab data objects (each represented as hash array)
	*/
	public function get_objects($type = null)
	{
	if (!$type) $type = $this->type;

	if (!$this->valid) {
	return array();
	}

	// synchronize caches
	$this->cache->synchronize();

	// fetch objects from cache
	return $this->cache->select($this->_prepare_query($type));
	}


	/**
	* Select some Kolab objects matching the given query
	*
	* @param array Pseudo-SQL query as list of filter parameter triplets
	* triplet: array('<colname>', '<comparator>', '<value>')
	* @return array List of Kolab data objects (each represented as hash array)
	*/
	public function select($query = array())
	{
	if (!$this->valid) {
	return array();
	}

	// check query argument
	if (empty($query)) {
	return $this->get_objects();
	}

	// synchronize caches
	$this->cache->synchronize();

	// fetch objects from cache
	return $this->cache->select($this->_prepare_query($query));
	}


	/**
	* Getter for object UIDs only
	*
	* @param array Pseudo-SQL query as list of filter parameter triplets
	* @return array List of Kolab object UIDs
	*/
	public function get_uids($query = array())
	{
	if (!$this->valid) {
	return array();
	}

	// synchronize caches
	$this->cache->synchronize();

	// fetch UIDs from cache
	return $this->cache->select($this->_prepare_query($query), true);
	}

	/**
	* Setter for ORDER BY and LIMIT parameters for cache queries
	*
	* @param array List of columns to order by
	* @param integer Limit result set to this length
	* @param integer Offset row
	*/
	public function set_order_and_limit($sortcols, $length = null, $offset = 0)
	{
	$this->cache->set_order_by($sortcols);

	if ($length !== null) {
	$this->cache->set_limit($length, $offset);
	}
	}

	/**
	* Helper method to sanitize query arguments
	*/
	private function _prepare_query($query)
	{
	// string equals type query
	// FIXME: should not be called this way!
	if (is_string($query)) {
	return $this->cache->has_type_col() && !empty($query) ? array(array('type','=',$query)) : array();
	}

	foreach ((array)$query as $i => $param) {
	if ($param[0] == 'type' && !$this->cache->has_type_col()) {
	unset($query[$i]);
	}
	else if (($param[0] == 'dtstart' \|\| $param[0] == 'dtend' \|\| $param[0] == 'changed')) {
	if (is_object($param[2]) && is_a($param[2], 'DateTime'))
	$param[2] = $param[2]->format('U');
	if (is_numeric($param[2]))
	$query[$i][2] = date('Y-m-d H:i:s', $param[2]);
	}
	}

	return $query;
	}


	/**
	* Getter for a single Kolab object, identified by its UID
	*
	* @param string $uid Object UID
	* @param string $type Object type (e.g. contact, event, todo, journal, note, configuration)
	* Defaults to folder type
	*
	* @return array The Kolab object represented as hash array
	*/
	public function get_object($uid, $type = null)
	{
	if (!$this->valid) {
	return false;
	}

	// synchronize caches
	$this->cache->synchronize();

	$msguid = $this->cache->uid2msguid($uid);

	if ($msguid && ($object = $this->cache->get($msguid, $type))) {
	return $object;
	}

	return false;
	}


	/**
	* Fetch a Kolab object attachment which is stored in a separate part
	* of the mail MIME message that represents the Kolab record.
	*
	* @param string Object's UID
	* @param string The attachment's mime number
	* @param string IMAP folder where message is stored;
	* If set, that also implies that the given UID is an IMAP UID
	* @param bool True to print the part content
	* @param resource File pointer to save the message part
	* @param boolean Disables charset conversion
	*
	* @return mixed The attachment content as binary string
	*/
	public function get_attachment($uid, $part, $mailbox = null, $print = false, $fp = null, $skip_charset_conv = false)
	{
	if ($this->valid && ($msguid = ($mailbox ? $uid : $this->cache->uid2msguid($uid)))) {
	$this->imap->set_folder($mailbox ? $mailbox : $this->name);

	if (substr($part, 0, 2) == 'i:') {
	// attachment data is stored in XML
	if ($object = $this->cache->get($msguid)) {
	// load data from XML (attachment content is not stored in cache)
	if ($object['_formatobj'] && isset($object['_size'])) {
	$object['_attachments'] = array();
	$object['_formatobj']->get_attachments($object);
	}

	foreach ($object['_attachments'] as $attach) {
	if ($attach['id'] == $part) {
	if ($print) echo $attach['content'];
	else if ($fp) fwrite($fp, $attach['content']);
	else return $attach['content'];
	return true;
	}
	}
	}
	}
	else {
	// return message part from IMAP directly
	return $this->imap->get_message_part($msguid, $part, null, $print, $fp, $skip_charset_conv);
	}
	}

	return null;
	}


	/**
	* Fetch the mime message from the storage server and extract
	* the Kolab groupware object from it
	*
	* @param string The IMAP message UID to fetch
	* @param string The object type expected (use wildcard '*' to accept all types)
	* @param string The folder name where the message is stored
	*
	* @return mixed Hash array representing the Kolab object, a kolab_format instance or false if not found
	*/
	public function read_object($msguid, $type = null, $folder = null)
	{
	if (!$this->valid) {
	return false;
	}

	if (!$type) $type = $this->type;
	if (!$folder) $folder = $this->name;

	$this->imap->set_folder($folder);

	$this->cache->bypass(true);
	$message = new rcube_message($msguid);
	$this->cache->bypass(false);

	// Message doesn't exist?
	if (empty($message->headers)) {
	return false;
	}

	// extract the X-Kolab-Type header from the XML attachment part if missing
	if (empty($message->headers->others['x-kolab-type'])) {
	foreach ((array)$message->attachments as $part) {
	if (strpos($part->mimetype, kolab_format::KTYPE_PREFIX) === 0) {
	$message->headers->others['x-kolab-type'] = $part->mimetype;
	break;
	}
	}
	}
	// fix buggy messages stating the X-Kolab-Type header twice
	else if (is_array($message->headers->others['x-kolab-type'])) {
	$message->headers->others['x-kolab-type'] = reset($message->headers->others['x-kolab-type']);
	}

	// no object type header found: abort
	if (empty($message->headers->others['x-kolab-type'])) {
	rcube::raise_error(array(
	'code' => 600,
	'type' => 'php',
	'file' => __FILE__,
	'line' => __LINE__,
	'message' => "No X-Kolab-Type information found in message $msguid ($this->name).",
	), true);
	return false;
	}

	$object_type = kolab_format::mime2object_type($message->headers->others['x-kolab-type']);
	$content_type = kolab_format::KTYPE_PREFIX . $object_type;

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

	$attachments = array();

	// get XML part
	foreach ((array)$message->attachments as $part) {
	if (!$xml && ($part->mimetype == $content_type \|\| preg_match('!application/([a-z.]+\+)?xml!', $part->mimetype))) {
	$xml = $message->get_part_body($part->mime_id, true);
	}
	else if ($part->filename \|\| $part->content_id) {
	$key = $part->content_id ? trim($part->content_id, '<>') : $part->filename;
	$size = null;

	// Use Content-Disposition 'size' as for the Kolab Format spec.
	if (isset($part->d_parameters['size'])) {
	$size = $part->d_parameters['size'];
	}
	// we can trust part size only if it's not encoded
	else if ($part->encoding == 'binary' \|\| $part->encoding == '7bit' \|\| $part->encoding == '8bit') {
	$size = $part->size;
	}

	$attachments[$key] = array(
	'id' => $part->mime_id,
	'name' => $part->filename,
	'mimetype' => $part->mimetype,
	'size' => $size,
	);
	}
	}

	if (!$xml) {
	rcube::raise_error(array(
	'code' => 600,
	'type' => 'php',
	'file' => __FILE__,
	'line' => __LINE__,
	'message' => "Could not find Kolab data part in message $msguid ($this->name).",
	), true);
	return false;
	}

	// check kolab format version
	$format_version = $message->headers->others['x-kolab-mime-version'];
	if (empty($format_version)) {
	list($xmltype, $subtype) = explode('.', $object_type);
	$xmlhead = substr($xml, 0, 512);

	// detect old Kolab 2.0 format
	if (strpos($xmlhead, '<' . $xmltype) !== false && strpos($xmlhead, 'xmlns=') === false)
	$format_version = '2.0';
	else
	$format_version = '3.0'; // assume 3.0
	}

	// get Kolab format handler for the given type
	$format = kolab_format::factory($object_type, $format_version);

	if (is_a($format, 'PEAR_Error'))
	return false;

	// load Kolab object from XML part
	$format->load($xml);

	if ($format->is_valid()) {
	$object = $format->to_array(array('_attachments' => $attachments));
	$object['_type'] = $object_type;
	$object['_msguid'] = $msguid;
	$object['_mailbox'] = $this->name;
	$object['_formatobj'] = $format;

	return $object;
	}
	else {
	// try to extract object UID from XML block
	if (preg_match('!<uid>(.+)</uid>!Uims', $xml, $m))
	$msgadd = " UID = " . trim(strip_tags($m[1]));

	rcube::raise_error(array(
	'code' => 600,
	'type' => 'php',
	'file' => __FILE__,
	'line' => __LINE__,
	'message' => "Could not parse Kolab object data in message $msguid ($this->name)." . $msgadd,
	), true);
	}

	return false;
	}

	/**
	* Save an object in this folder.
	*
	* @param array $object The array that holds the data of the object.
	* @param string $type The type of the kolab object.
	* @param string $uid The UID of the old object if it existed before
	* @return boolean True on success, false on error
	*/
	public function save(&$object, $type = null, $uid = null)
	{
	if (!$this->valid) {
	return false;
	}

	if (!$type)
	$type = $this->type;

	// copy attachments from old message
	if (!empty($object['_msguid']) && ($old = $this->cache->get($object['_msguid'], $type, $object['_mailbox']))) {
	foreach ((array)$old['_attachments'] as $key => $att) {
	if (!isset($object['_attachments'][$key])) {
	$object['_attachments'][$key] = $old['_attachments'][$key];
	}
	// unset deleted attachment entries
	if ($object['_attachments'][$key] == false) {
	unset($object['_attachments'][$key]);
	}
	// load photo.attachment from old Kolab2 format to be directly embedded in xcard block
	else if ($type == 'contact' && ($key == 'photo.attachment' \|\| $key == 'kolab-picture.png') && $att['id']) {
	if (!isset($object['photo']))
	$object['photo'] = $this->get_attachment($object['_msguid'], $att['id'], $object['_mailbox']);
	unset($object['_attachments'][$key]);
	}
	}
	}

	// save contact photo to attachment for Kolab2 format
	if (kolab_storage::$version == '2.0' && $object['photo']) {
	$attkey = 'kolab-picture.png'; // this file name is hard-coded in libkolab/kolabformatV2/contact.cpp
	$object['_attachments'][$attkey] = array(
	'mimetype'=> rcube_mime::image_content_type($object['photo']),
	'content' => preg_match('![^a-z0-9/=+-]!i', $object['photo']) ? $object['photo'] : base64_decode($object['photo']),
	);
	}

	// process attachments
	if (is_array($object['_attachments'])) {
	$numatt = count($object['_attachments']);
	foreach ($object['_attachments'] as $key => $attachment) {
	// FIXME: kolab_storage and Roundcube attachment hooks use different fields!
	if (empty($attachment['content']) && !empty($attachment['data'])) {
	$attachment['content'] = $attachment['data'];
	unset($attachment['data'], $object['_attachments'][$key]['data']);
	}

	// make sure size is set, so object saved in cache contains this info
	if (!isset($attachment['size'])) {
	if (!empty($attachment['content'])) {
	if (is_resource($attachment['content'])) {
	// this need to be a seekable resource, otherwise
	// fstat() failes and we're unable to determine size
	// here nor in rcube_imap_generic before IMAP APPEND
	$stat = fstat($attachment['content']);
	$attachment['size'] = $stat ? $stat['size'] : 0;
	}
	else {
	$attachment['size'] = strlen($attachment['content']);
	}
	}
	else if (!empty($attachment['path'])) {
	$attachment['size'] = filesize($attachment['path']);
	}
	$object['_attachments'][$key] = $attachment;
	}

	// generate unique keys (used as content-id) for attachments
	if (is_numeric($key) && $key < $numatt) {
	// derrive content-id from attachment file name
	$ext = preg_match('/(\.[a-z0-9]{1,6})$/i', $attachment['name'], $m) ? $m[1] : null;
	$basename = preg_replace('/[^a-z0-9_.-]/i', '', basename($attachment['name'], $ext)); // to 7bit ascii
	if (!$basename) $basename = 'noname';
	$cid = $basename . '.' . microtime(true) . $ext;

	$object['_attachments'][$cid] = $attachment;
	unset($object['_attachments'][$key]);
	}
	}
	}

	// save recurrence exceptions as individual objects due to lack of support in Kolab v2 format
	if (kolab_storage::$version == '2.0' && $object['recurrence']['EXCEPTIONS']) {
	$this->save_recurrence_exceptions($object, $type);
	}

	// check IMAP BINARY extension support for 'file' objects
	// allow configuration to workaround bug in Cyrus < 2.4.17
	$rcmail = rcube::get_instance();
	$binary = $type == 'file' && !$rcmail->config->get('kolab_binary_disable') && $this->imap->get_capability('BINARY');

	// generate and save object message
	if ($raw_msg = $this->build_message($object, $type, $binary, $body_file)) {
	// resolve old msguid before saving
	if ($uid && empty($object['_msguid']) && ($msguid = $this->cache->uid2msguid($uid))) {
	$object['_msguid'] = $msguid;
	$object['_mailbox'] = $this->name;
	}

	$result = $this->imap->save_message($this->name, $raw_msg, null, false, null, null, $binary);

	// update cache with new UID
	if ($result) {
	$old_uid = $object['_msguid'];

	$object['_msguid'] = $result;
	$object['_mailbox'] = $this->name;

	if ($old_uid) {
	// delete old message
	$this->cache->bypass(true);
	$this->imap->delete_message($old_uid, $object['_mailbox']);
	$this->cache->bypass(false);
	}

	// insert/update message in cache
	$this->cache->save($result, $object, $old_uid);
	}

	// remove temp file
	if ($body_file) {
	@unlink($body_file);
	}
	}

	return $result;
	}

	/**
	* Save recurrence exceptions as individual objects.
	* The Kolab v2 format doesn't allow us to save fully embedded exception objects.
	*
	* @param array Hash array with event properties
	* @param string Object type
	*/
	private function save_recurrence_exceptions(&$object, $type = null)
	{
	if ($object['recurrence']['EXCEPTIONS']) {
	$exdates = array();
	foreach ((array)$object['recurrence']['EXDATE'] as $exdate) {
	$key = is_a($exdate, 'DateTime') ? $exdate->format('Y-m-d') : strval($exdate);
	$exdates[$key] = 1;
	}

	// save every exception as individual object
	foreach((array)$object['recurrence']['EXCEPTIONS'] as $exception) {
	$exception['uid'] = self::recurrence_exception_uid($object['uid'], $exception['start']->format('Ymd'));
	$exception['sequence'] = $object['sequence'] + 1;

	if ($exception['thisandfuture']) {
	$exception['recurrence'] = $object['recurrence'];

	// adjust the recurrence duration of the exception
	if ($object['recurrence']['COUNT']) {
	$recurrence = new kolab_date_recurrence($object['_formatobj']);
	if ($end = $recurrence->end()) {
	unset($exception['recurrence']['COUNT']);
	$exception['recurrence']['UNTIL'] = $end;
	}
	}

	// set UNTIL date if we have a thisandfuture exception
	$untildate = clone $exception['start'];
	$untildate->sub(new DateInterval('P1D'));
	$object['recurrence']['UNTIL'] = $untildate;
	unset($object['recurrence']['COUNT']);
	}
	else {
	if (!$exdates[$exception['start']->format('Y-m-d')])
	$object['recurrence']['EXDATE'][] = clone $exception['start'];
	unset($exception['recurrence']);
	}

	unset($exception['recurrence']['EXCEPTIONS'], $exception['_formatobj'], $exception['_msguid']);
	$this->save($exception, $type, $exception['uid']);
	}

	unset($object['recurrence']['EXCEPTIONS']);
	}
	}

	/**
	* Generate an object UID with the given recurrence-ID in a way that it is
	* unique (the original UID is not a substring) but still recoverable.
	*/
	private static function recurrence_exception_uid($uid, $recurrence_id)
	{
	$offset = -2;
	return substr($uid, 0, $offset) . '-' . $recurrence_id . '-' . substr($uid, $offset);
	}

	/**
	* Delete the specified object from this folder.
	*
	* @param mixed $object The Kolab object to delete or object UID
	* @param boolean $expunge Should the folder be expunged?
	*
	* @return boolean True if successful, false on error
	*/
	public function delete($object, $expunge = true)
	{
	if (!$this->valid) {
	return false;
	}

	$msguid = is_array($object) ? $object['_msguid'] : $this->cache->uid2msguid($object);
	$success = false;

	$this->cache->bypass(true);

	if ($msguid && $expunge) {
	$success = $this->imap->delete_message($msguid, $this->name);
	}
	else if ($msguid) {
	$success = $this->imap->set_flag($msguid, 'DELETED', $this->name);
	}

	$this->cache->bypass(false);

	if ($success) {
	$this->cache->set($msguid, false);
	}

	return $success;
	}


	/**
	*
	*/
	public function delete_all()
	{
	if (!$this->valid) {
	return false;
	}

	$this->cache->purge();
	$this->cache->bypass(true);
	$result = $this->imap->clear_folder($this->name);
	$this->cache->bypass(false);

	return $result;
	}


	/**
	* Restore a previously deleted object
	*
	* @param string Object UID
	* @return mixed Message UID on success, false on error
	*/
	public function undelete($uid)
	{
	if (!$this->valid) {
	return false;
	}

	if ($msguid = $this->cache->uid2msguid($uid, true)) {
	$this->cache->bypass(true);
	$result = $this->imap->set_flag($msguid, 'UNDELETED', $this->name);
	$this->cache->bypass(false);

	if ($result) {
	return $msguid;
	}
	}

	return false;
	}


	/**
	* Move a Kolab object message to another IMAP folder
	*
	* @param string Object UID
	* @param string IMAP folder to move object to
	* @return boolean True on success, false on failure
	*/
	public function move($uid, $target_folder)
	{
	if (!$this->valid) {
	return false;
	}

	if (is_string($target_folder))
	$target_folder = kolab_storage::get_folder($target_folder);

	if ($msguid = $this->cache->uid2msguid($uid)) {
	$this->cache->bypass(true);
	$result = $this->imap->move_message($msguid, $target_folder->name, $this->name);
	$this->cache->bypass(false);

	if ($result) {
	$this->cache->move($msguid, $uid, $target_folder);
	return true;
	}
	else {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Failed to move message $msguid to $target_folder: " . $this->imap->get_error_str(),
	), true);
	}
	}

	return false;
	}


	/**
	* Creates source of the configuration object message
	*
	* @param array $object The array that holds the data of the object.
	* @param string $type The type of the kolab object.
	* @param bool $binary Enables use of binary encoding of attachment(s)
	* @param string $body_file Reference to filename of message body
	*
	* @return mixed Message as string or array with two elements
	* (one for message file path, second for message headers)
	*/
	private function build_message(&$object, $type, $binary, &$body_file)
	{
	// load old object to preserve data we don't understand/process
	if (is_object($object['_formatobj']))
	$format = $object['_formatobj'];
	else if ($object['_msguid'] && ($old = $this->cache->get($object['_msguid'], $type, $object['_mailbox'])))
	$format = $old['_formatobj'];

	// create new kolab_format instance
	if (!$format)
	$format = kolab_format::factory($type, kolab_storage::$version);

	if (PEAR::isError($format))
	return false;

	$format->set($object);
	$xml = $format->write(kolab_storage::$version);
	$object['uid'] = $format->uid; // read UID from format
	$object['_formatobj'] = $format;

	if (empty($xml) \|\| !$format->is_valid() \|\| empty($object['uid'])) {
	return false;
	}

	$mime = new Mail_mime("\r\n");
	$rcmail = rcube::get_instance();
	$headers = array();
	$files = array();
	$part_id = 1;
	$encoding = $binary ? 'binary' : 'base64';

	if ($user_email = $rcmail->get_user_email()) {
	$headers['From'] = $user_email;
	$headers['To'] = $user_email;
	}
	$headers['Date'] = date('r');
	$headers['X-Kolab-Type'] = kolab_format::KTYPE_PREFIX . $type;
	$headers['X-Kolab-Mime-Version'] = kolab_storage::$version;
	$headers['Subject'] = $object['uid'];
	// $headers['Message-ID'] = $rcmail->gen_message_id();
	$headers['User-Agent'] = $rcmail->config->get('useragent');

	// Check if we have enough memory to handle the message in it
	// It's faster than using files, so we'll do this if we only can
	if (!empty($object['_attachments']) && ($mem_limit = parse_bytes(ini_get('memory_limit'))) > 0) {
	$memory = function_exists('memory_get_usage') ? memory_get_usage() : 1610241024; // safe value: 16MB

	foreach ($object['_attachments'] as $attachment) {
	$memory += $attachment['size'];
	}

	// 1.33 is for base64, we need at least 4x more memory than the message size
	if ($memory * ($binary ? 1 : 1.33) * 4 > $mem_limit) {
	$marker = '%%%~~~' . md5(microtime(true) . $memory) . '~~~%%%';
	$is_file = true;
	$temp_dir = unslashify($rcmail->config->get('temp_dir'));
	$mime->setParam('delay_file_io', true);
	}
	}

	$mime->headers($headers);
	$mime->setTXTBody("This is a Kolab Groupware object. "
	. "To view this object you will need an email client that understands the Kolab Groupware format. "
	. "For a list of such email clients please visit http://www.kolab.org/\n\n");

	$ctype = kolab_storage::$version == '2.0' ? $format->CTYPEv2 : $format->CTYPE;
	// Convert new lines to \r\n, to wrokaround "NO Message contains bare newlines"
	// when APPENDing from temp file
	$xml = preg_replace('/\r?\n/', "\r\n", $xml);

	$mime->addAttachment($xml, // file
	$ctype, // content-type
	'kolab.xml', // filename
	false, // is_file
	'8bit', // encoding
	'attachment', // disposition
	RCUBE_CHARSET // charset
	);
	$part_id++;

	// save object attachments as separate parts
	foreach ((array)$object['_attachments'] as $key => $att) {
	if (empty($att['content']) && !empty($att['id'])) {
	// @TODO: use IMAP CATENATE to skip attachment fetch+push operation
	$msguid = !empty($object['_msguid']) ? $object['_msguid'] : $object['uid'];
	if ($is_file) {
	$att['path'] = tempnam($temp_dir, 'rcmAttmnt');
	if (($fp = fopen($att['path'], 'w')) && $this->get_attachment($msguid, $att['id'], $object['_mailbox'], false, $fp, true)) {
	fclose($fp);
	}
	else {
	return false;
	}
	}
	else {
	$att['content'] = $this->get_attachment($msguid, $att['id'], $object['_mailbox'], false, null, true);
	}
	}

	$headers = array('Content-ID' => Mail_mimePart::encodeHeader('Content-ID', '<' . $key . '>', RCUBE_CHARSET, 'quoted-printable'));
	$name = !empty($att['name']) ? $att['name'] : $key;

	// To store binary files we can use faster method
	// without writting full message content to a temporary file but
	// directly to IMAP, see rcube_imap_generic::append().
	// I.e. use file handles where possible
	if (!empty($att['path'])) {
	if ($is_file && $binary) {
	$files[] = fopen($att['path'], 'r');
	$mime->addAttachment($marker, $att['mimetype'], $name, false, $encoding, 'attachment', '', '', '', null, null, '', RCUBE_CHARSET, $headers);
	}
	else {
	$mime->addAttachment($att['path'], $att['mimetype'], $name, true, $encoding, 'attachment', '', '', '', null, null, '', RCUBE_CHARSET, $headers);
	}
	}
	else {
	if (is_resource($att['content']) && $is_file && $binary) {
	$files[] = $att['content'];
	$mime->addAttachment($marker, $att['mimetype'], $name, false, $encoding, 'attachment', '', '', '', null, null, '', RCUBE_CHARSET, $headers);
	}
	else {
	if (is_resource($att['content'])) {
	@rewind($att['content']);
	$att['content'] = stream_get_contents($att['content']);
	}
	$mime->addAttachment($att['content'], $att['mimetype'], $name, false, $encoding, 'attachment', '', '', '', null, null, '', RCUBE_CHARSET, $headers);
	}
	}

	$object['_attachments'][$key]['id'] = ++$part_id;
	}

	if (!$is_file \|\| !empty($files)) {
	$message = $mime->getMessage();
	}

	// parse message and build message array with
	// attachment file pointers in place of file markers
	if (!empty($files)) {
	$message = explode($marker, $message);
	$tmp = array();

	foreach ($message as $msg_part) {
	$tmp[] = $msg_part;
	if ($file = array_shift($files)) {
	$tmp[] = $file;
	}
	}
	$message = $tmp;
	}
	// write complete message body into temp file
	else if ($is_file) {
	// use common temp dir
	$body_file = tempnam($temp_dir, 'rcmMsg');

	if (PEAR::isError($mime_result = $mime->saveMessageBody($body_file))) {
	self::raise_error(array('code' => 650, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Could not create message: ".$mime_result->getMessage()),
	true, false);
	return false;
	}

	$message = array(trim($mime->txtHeaders()) . "\r\n\r\n", fopen($body_file, 'r'));
	}

	return $message;
	}


	/**
	* Triggers any required updates after changes within the
	* folder. This is currently only required for handling free/busy
	* information with Kolab.
	*
	* @return boolean\|PEAR_Error True if successfull.
	*/
	public function trigger()
	{
	$owner = $this->get_owner();
	$result = false;

	switch($this->type) {
	case 'event':
	if ($this->get_namespace() == 'personal') {
	$result = $this->trigger_url(
	sprintf('%s/trigger/%s/%s.pfb',
	kolab_storage::get_freebusy_server(),
	urlencode($owner),
	urlencode($this->imap->mod_folder($this->name))
	),
	$this->imap->options['user'],
	$this->imap->options['password']
	);
	}
	break;

	default:
	return true;
	}

	if ($result && is_object($result) && is_a($result, 'PEAR_Error')) {
	return PEAR::raiseError(sprintf("Failed triggering folder %s. Error was: %s",
	$this->name, $result->getMessage()));
	}

	return $result;
	}

	/**
	* Triggers a URL.
	*
	* @param string $url The URL to be triggered.
	* @param string $auth_user Username to authenticate with
	* @param string $auth_passwd Password for basic auth
	* @return boolean\|PEAR_Error True if successfull.
	*/
	private function trigger_url($url, $auth_user = null, $auth_passwd = null)
	{
	try {
	$request = libkolab::http_request($url);

	// set authentication credentials
	if ($auth_user && $auth_passwd)
	$request->setAuth($auth_user, $auth_passwd);

	$result = $request->send();
	// rcube::write_log('trigger', $result->getBody());
	}
	catch (Exception $e) {
	return PEAR::raiseError($e->getMessage());
	}

	return true;
	}

	}

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