kolab_storage.php
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kolab_storage.php
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	<?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';
	const UID_KEY_SHARED = '/shared/vendor/kolab/uniqueid';
	const UID_KEY_PRIVATE = '/private/vendor/kolab/uniqueid';
	const UID_KEY_CYRUS = '/shared/vendor/cmu/cyrus-imapd/uniqueid';

	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)
	* @param boolean 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, $folderdata[$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,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) 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 ($name = self::custom_displayname($folder)) {
	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 !== '' ? ' ' . $folder : '');

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

	return $folder;
	}

	/**
	* Get custom display name (saved in metadata) for the given folder
	*/
	public static function custom_displayname($folder)
	{
	// find custom display name in folder METADATA
	if (self::$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;
	}
	}

	return false;
	}

	/**
	* 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);

	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;
	}
	}

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

	$names[$name] = self::object_name($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 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 self::$imap->sort_folder_list(array_keys($folderdata), true);
	}

	// 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)
	{
	$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][$folder->name] = strtolower(html_entity_decode(self::object_name($folder->name, $ns), 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 $folders Folders list
	*
	* @return array Folders list
	*/
	public static function folder_hierarchy($folders)
	{
	$_folders = array();
	$existing = array_map(function($folder){ return $folder->get_name(); }, $folders);
	$delim = rcube::get_instance()->get_storage()->get_hierarchy_delimiter();

	foreach ($folders as $idx => $folder) {
	$path = explode($delim, $folder->name);
	array_pop($path);

	// skip top folders or ones with a custom displayname
	if (count($path) <= 1 \|\| kolab_storage::custom_displayname($folder->name)) {
	}
	else {
	$parents = array();

	while (count($path) > 1 && ($parent = join($delim, $path))) {
	$name = kolab_storage::object_name($parent, $folder->get_namespace());
	if (!in_array($name, $existing)) {
	$parents[$parent] = new virtual_kolab_storage_folder($parent, $name, $folder->get_namespace());
	$existing[] = $name;
	}

	array_pop($path);
	}

	if (!empty($parents)) {
	$parents = array_reverse(array_values($parents));
	foreach ($parents as $parent) {
	$_folders[] = $parent;
	}
	}
	}

	$_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;
	}

	$folderdata = self::$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::$imap->create_folder($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 $prop Folder properties
	*/
	public static function set_folder_props($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
	}
	}
	}

	}

	/**
	* Helper class that represents a virtual IMAP folder
	* with a subset of the kolab_storage_folder API.
	*/
	class virtual_kolab_storage_folder
	{
	public $id;
	public $name;
	public $namespace;
	public $virtual = true;

	public function __construct($realname, $name, $ns)
	{
	$this->id = kolab_storage::folder_id($realname);
	$this->name = $name;
	$this->namespace = $ns;
	}

	public function get_namespace()
	{
	return $this->namespace;
	}

	public function get_name()
	{
	// this is already kolab_storage::object_name() result
	return $this->name;
	}
	}

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