D4631.1775313743.diff
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	diff --git a/composer.json-dist b/composer.json-dist
	--- a/composer.json-dist
	+++ b/composer.json-dist
	@@ -18,11 +18,14 @@
	"pear/net_smtp": "~1.7.1",
	"pear/net_ldap2": "~2.2.0",
	"pear/net_sieve": "~1.4.0",
	+ "sabre/vobject": "~4.5.1",
	"kolab/net_ldap3": "dev-master",
	+ "zf1s/zend-controller": "~1.12.20",
	"zf1s/zend-json": "~1.12.20",
	"zf1s/zend-log": "~1.12.20"
	},
	"require-dev": {
	+ "guzzlehttp/guzzle": "^7.3.0",
	"phpunit/phpunit": "^4.8 \|\| ^5.7 \|\| ^6 \|\| ^7 \|\| ^9"
	}
	}
	diff --git a/lib/ext/Syncroton/Server.php b/lib/ext/Syncroton/Server.php
	--- a/lib/ext/Syncroton/Server.php
	+++ b/lib/ext/Syncroton/Server.php
	@@ -435,6 +435,7 @@

	$device->useragent = $requestParameters['userAgent'];
	$device->acsversion = $requestParameters['protocolVersion'];
	+ $device->devicetype = $requestParameters['deviceType'];

	if ($device->isDirty()) {
	$device = $this->_deviceBackend->update($device);
	diff --git a/lib/kolab_sync.php b/lib/kolab_sync.php
	--- a/lib/kolab_sync.php
	+++ b/lib/kolab_sync.php
	@@ -28,25 +28,19 @@
	*/
	class kolab_sync extends rcube
	{
	- /**
	- * Application name
	- *
	- * @var string
	- */
	+ /** @var string Application name */
	public $app_name = 'ActiveSync for Kolab'; // no double quotes inside

	- /**
	- * Current user
	- *
	- * @var rcube_user
	- */
	- public $user;
	-
	+ /** @var string\|null Request user name */
	public $username;
	+
	+ /** @var string\|null Request user password */
	public $password;

	- public $task = null;
	+ public $task;
	+
	protected $per_user_log_dir;
	+ protected $log_dir;

	const CHARSET = 'UTF-8';
	const VERSION = "2.4.2";
	@@ -77,8 +71,9 @@
	public function startup()
	{
	// Initialize Syncroton Logger
	- $debug_mode = $this->config->get('activesync_debug') ? kolab_sync_logger::DEBUG : kolab_sync_logger::WARN;
	- $this->logger = new kolab_sync_logger($debug_mode);
	+ $debug_mode = $this->config->get('activesync_debug') ? kolab_sync_logger::DEBUG : kolab_sync_logger::WARN;
	+ $this->logger = new kolab_sync_logger($debug_mode);
	+ $this->log_dir = $this->config->get('log_dir');

	// Get list of plugins
	// WARNING: We can use only plugins that are prepared for this
	@@ -132,6 +127,9 @@
	}
	}

	+ // Set log directory per-user
	+ $this->set_log_dir($_SERVER['PHP_AUTH_USER']);
	+
	// Authenticate the user
	$userid = $this->authenticate($_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW']);
	}
	@@ -144,7 +142,7 @@

	$this->plugins->exec_hook('ready', array('task' => 'syncroton'));

	- // Set log directory per-user
	+ // Set log directory per-user (again, in case the username changed above)
	$this->set_log_dir();

	// Save user password for Roundcube Framework
	@@ -210,7 +208,7 @@
	}

	// LDAP server failure... send 503 error
	- if ($auth['kolab_ldap_error'] ?? null) {
	+ if (!empty($auth['kolab_ldap_error'])) {
	self::server_error();
	}

	@@ -228,7 +226,7 @@
	$err = null;

	// Authenticate - get Roundcube user ID
	- if (!($auth['abort'] ?? false) && ($userid = $this->login($auth['user'], $auth['pass'], $auth['host'], $err))) {
	+ if (empty($auth['abort']) && ($userid = $this->login($auth['user'], $auth['pass'], $auth['host'], $err))) {
	// set real username
	$this->username = $auth['user'];
	return $userid;
	@@ -259,7 +257,7 @@
	private function select_host($username)
	{
	// Get IMAP host
	- $host = $this->config->get('default_host');
	+ $host = $this->config->get('imap_host', $this->config->get('default_host'));

	if (is_array($host)) {
	list($user, $domain) = explode('@', $username);
	@@ -390,16 +388,36 @@
	}


	+ /**
	+ * Initializes and returns the storage backend object
	+ */
	+ public static function storage()
	+ {
	+ $class = 'kolab_sync_storage';
	+ $self = self::get_instance();
	+
	+ if (($name = $self->config->get('activesync_storage')) && $name != 'kolab') {
	+ $class .= '_' . strtolower($name);
	+ }
	+
	+ return $class::get_instance();
	+ }
	+
	+
	/**
	* Set logging directory per-user
	*/
	- protected function set_log_dir()
	+ protected function set_log_dir($username = null)
	{
	- if (empty($this->username)) {
	+ if (empty($username)) {
	+ $username = $this->username;
	+ }
	+
	+ if (empty($username)) {
	return;
	}

	- $this->logger->set_username($this->username);
	+ $this->logger->set_username($username);

	$user_debug = (bool) $this->config->get('per_user_logging');

	@@ -407,8 +425,7 @@
	return;
	}

	- $log_dir = $this->config->get('log_dir');
	- $log_dir .= DIRECTORY_SEPARATOR . $this->username;
	+ $log_dir = $this->log_dir . DIRECTORY_SEPARATOR . $username;

	// No automatically creating any log directories
	if (!is_dir($log_dir)) {
	@@ -470,6 +487,10 @@
	*/
	public static function server_error()
	{
	+ if (php_sapi_name() == 'cli') {
	+ throw new Exception("LDAP/IMAP error on authentication");
	+ }
	+
	header("HTTP/1.1 503 Service Temporarily Unavailable");
	header("Retry-After: 120");
	exit;
	@@ -490,6 +511,7 @@
	if ($this->config->get('devel_mode') \|\| $this->config->get('performance_stats')) {
	// we have to disable per_user_logging to make sure stats end up in the main console log
	$this->config->set('per_user_logging', false);
	+ $this->config->set('log_dir', $this->log_dir);

	// make sure logged numbers use unified format
	setlocale(LC_NUMERIC, 'en_US.utf8', 'en_US.UTF-8', 'en_US', 'C');
	@@ -499,7 +521,7 @@
	if (function_exists('memory_get_peak_usage'))
	$mem .= '/' . round(memory_get_peak_usage() / 1048576, 1);

	- $query = $_SERVER['QUERY_STRING'];
	+ $query = $_SERVER['QUERY_STRING'] ?? '';
	$log = $query . ($mem ? ($query ? ' ' : '') . "[$mem]" : '');

	if (defined('KOLAB_SYNC_START'))
	@@ -528,5 +550,8 @@

	kolab_sync_data_gal::$address_books = array();
	}
	+
	+ // Reset internal cache of the storage class
	+ self::storage()->reset();
	}
	}
	diff --git a/lib/kolab_sync_backend.php b/lib/kolab_sync_backend.php
	deleted file mode 100644
	--- a/lib/kolab_sync_backend.php
	+++ /dev/null
	@@ -1,1057 +0,0 @@
	-<?php
	-
	-/**
	- +--------------------------------------------------------------------------+
	- \| Kolab Sync (ActiveSync for Kolab) \|
	- \| \|
	- \| Copyright (C) 2011-2012, 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/> \|
	- +--------------------------------------------------------------------------+
	- \| Author: Aleksander Machniak <machniak@kolabsys.com> \|
	- +--------------------------------------------------------------------------+
	-*/
	-
	-class kolab_sync_backend
	-{
	- /**
	- * Singleton instace of kolab_sync_backend
	- *
	- * @var kolab_sync_backend
	- */
	- static protected $instance;
	-
	- protected $storage;
	- protected $folder_meta;
	- protected $folder_uids;
	- protected $root_meta;
	-
	- static protected $types = array(
	- 1 => '',
	- 2 => 'mail.inbox',
	- 3 => 'mail.drafts',
	- 4 => 'mail.wastebasket',
	- 5 => 'mail.sentitems',
	- 6 => 'mail.outbox',
	- 7 => 'task.default',
	- 8 => 'event.default',
	- 9 => 'contact.default',
	- 10 => 'note.default',
	- 11 => 'journal.default',
	- 12 => 'mail',
	- 13 => 'event',
	- 14 => 'contact',
	- 15 => 'task',
	- 16 => 'journal',
	- 17 => 'note',
	- );
	-
	- static protected $classes = array(
	- Syncroton_Data_Factory::CLASS_CALENDAR => 'event',
	- Syncroton_Data_Factory::CLASS_CONTACTS => 'contact',
	- Syncroton_Data_Factory::CLASS_EMAIL => 'mail',
	- Syncroton_Data_Factory::CLASS_NOTES => 'note',
	- Syncroton_Data_Factory::CLASS_TASKS => 'task',
	- );
	-
	- const ROOT_MAILBOX = 'INBOX';
	-// const ROOT_MAILBOX = '';
	- const ASYNC_KEY = '/private/vendor/kolab/activesync';
	- const UID_KEY = '/shared/vendor/cmu/cyrus-imapd/uniqueid';
	-
	-
	- /**
	- * This implements the 'singleton' design pattern
	- *
	- * @return kolab_sync_backend The one and only instance
	- */
	- static function get_instance()
	- {
	- if (!self::$instance) {
	- self::$instance = new kolab_sync_backend;
	- self::$instance->startup(); // init AFTER object was linked with self::$instance
	- }
	-
	- return self::$instance;
	- }
	-
	-
	- /**
	- * Class initialization
	- */
	- public function startup()
	- {
	- $this->storage = rcube::get_instance()->get_storage();
	-
	- // @TODO: reset cache? if we do this for every request the cache would be useless
	- // There's no session here
	- //$this->storage->clear_cache('mailboxes.', true);
	-
	- // set additional header used by libkolab
	- $this->storage->set_options(array(
	- // @TODO: there can be Roundcube plugins defining additional headers,
	- // we maybe would need to add them here
	- 'fetch_headers' => 'X-KOLAB-TYPE X-KOLAB-MIME-VERSION',
	- 'skip_deleted' => true,
	- 'threading' => false,
	- ));
	-
	- // Disable paging
	- $this->storage->set_pagesize(999999);
	- }
	-
	-
	- /**
	- * List known devices
	- *
	- * @return array Device list as hash array
	- */
	- public function devices_list()
	- {
	- if ($this->root_meta === null) {
	- // @TODO: consider server annotation instead of INBOX
	- if ($meta = $this->storage->get_metadata(self::ROOT_MAILBOX, self::ASYNC_KEY)) {
	- $this->root_meta = $this->unserialize_metadata($meta[self::ROOT_MAILBOX][self::ASYNC_KEY]);
	- }
	- else {
	- $this->root_meta = array();
	- }
	- }
	-
	- if (!empty($this->root_meta['DEVICE']) && is_array($this->root_meta['DEVICE'])) {
	- return $this->root_meta['DEVICE'];
	- }
	-
	- return array();
	- }
	-
	-
	- /**
	- * Get list of folders available for sync
	- *
	- * @param string $deviceid Device identifier
	- * @param string $type Folder type
	- * @param bool $flat_mode Enables flat-list mode
	- *
	- * @return array\|bool List of mailbox folders, False on backend failure
	- */
	- public function folders_list($deviceid, $type, $flat_mode = false)
	- {
	- // get all folders of specified type
	- $folders = kolab_storage::list_folders('', '*', $type, false, $typedata);
	-
	- // get folders activesync config
	- $folderdata = $this->folder_meta();
	-
	- if (!is_array($folders) \|\| !is_array($folderdata)) {
	- return false;
	- }
	-
	- $folders_list = array();
	-
	- // check if folders are "subscribed" for activesync
	- foreach ($folderdata as $folder => $meta) {
	- if (empty($meta['FOLDER']) \|\| empty($meta['FOLDER'][$deviceid])
	- \|\| empty($meta['FOLDER'][$deviceid]['S'])
	- ) {
	- continue;
	- }
	-
	- // force numeric folder name to be a string (T1283)
	- $folder = (string) $folder;
	-
	- if (!empty($type) && !in_array($folder, $folders)) {
	- continue;
	- }
	-
	- // Activesync folder identifier (serverId)
	- $folder_type = !empty($typedata[$folder]) ? $typedata[$folder] : 'mail';
	- $folder_id = self::folder_id($folder, $folder_type);
	-
	- $folders_list[$folder_id] = $this->folder_data($folder, $folder_type);
	- }
	-
	- if ($flat_mode) {
	- $folders_list = $this->folders_list_flat($folders_list, $type, $typedata);
	- }
	-
	- return $folders_list;
	- }
	-
	- /**
	- * Converts list of folders to a "flat" list
	- */
	- private function folders_list_flat($folders, $type, $typedata)
	- {
	- $delim = $this->storage->get_hierarchy_delimiter();
	-
	- foreach ($folders as $idx => $folder) {
	- if ($folder['parentId']) {
	- // for non-mail folders we make the list completely flat
	- if ($type != 'mail') {
	- $display_name = kolab_storage::object_name($folder['imap_name']);
	- $display_name = html_entity_decode($display_name, ENT_COMPAT, RCUBE_CHARSET);
	-
	- $folders[$idx]['parentId'] = 0;
	- $folders[$idx]['displayName'] = $display_name;
	- }
	- // for mail folders we modify only folders with non-existing parents
	- else if (!isset($folders[$folder['parentId']])) {
	- $items = explode($delim, $folder['imap_name']);
	- $parent = 0;
	-
	- // find existing parent
	- while (count($items) > 0) {
	- array_pop($items);
	-
	- $parent_name = implode($delim, $items);
	- $parent_type = !empty($typedata[$parent_name]) ? $typedata[$parent_name] : 'mail';
	- $parent_id = self::folder_id($parent_name, $parent_type);
	-
	- if (isset($folders[$parent_id])) {
	- $parent = $parent_id;
	- break;
	- }
	- }
	-
	- if (!$parent) {
	- $display_name = kolab_storage::object_name($folder['imap_name']);
	- $display_name = html_entity_decode($display_name, ENT_COMPAT, RCUBE_CHARSET);
	- }
	- else {
	- $parent_name = $folders[$parent_id]['imap_name'];
	- $display_name = substr($folder['imap_name'], strlen($parent_name)+1);
	- $display_name = rcube_charset::convert($display_name, 'UTF7-IMAP');
	- $display_name = str_replace($delim, ' » ', $display_name);
	- }
	-
	- $folders[$idx]['parentId'] = $parent;
	- $folders[$idx]['displayName'] = $display_name;
	- }
	- }
	- }
	-
	- return $folders;
	- }
	-
	- /**
	- * Getter for folder metadata
	- *
	- * @return array\|bool Hash array with meta data for each folder, False on backend failure
	- */
	- public function folder_meta()
	- {
	- if (!isset($this->folder_meta)) {
	- // get folders activesync config
	- $folderdata = $this->storage->get_metadata("*", self::ASYNC_KEY);
	-
	- if (!is_array($folderdata)) {
	- return $this->folder_meta = false;
	- }
	-
	- $this->folder_meta = array();
	-
	- foreach ($folderdata as $folder => $meta) {
	- if ($asyncdata = $meta[self::ASYNC_KEY]) {
	- if ($metadata = $this->unserialize_metadata($asyncdata)) {
	- $this->folder_meta[$folder] = $metadata;
	- }
	- }
	- }
	- }
	-
	- return $this->folder_meta;
	- }
	-
	-
	- /**
	- * Creates folder and subscribes to the device
	- *
	- * @param string $name Folder name (UTF7-IMAP)
	- * @param int $type Folder (ActiveSync) type
	- * @param string $deviceid Device identifier
	- *
	- * @return bool True on success, False on failure
	- */
	- public function folder_create($name, $type, $deviceid)
	- {
	- if ($this->storage->folder_exists($name)) {
	- $created = true;
	- }
	- else {
	- $type = self::type_activesync2kolab($type);
	- $created = kolab_storage::folder_create($name, $type, true);
	- }
	-
	- if ($created) {
	- // Set ActiveSync subscription flag
	- $this->folder_set($name, $deviceid, 1);
	-
	- return true;
	- }
	-
	- return false;
	- }
	-
	-
	- /**
	- * Renames a folder
	- *
	- * @param string $old_name Old folder name (UTF7-IMAP)
	- * @param string $new_name New folder name (UTF7-IMAP)
	- * @param int $type Folder (ActiveSync) type
	- *
	- * @return bool True on success, False on failure
	- */
	- public function folder_rename($old_name, $new_name, $type)
	- {
	- $this->folder_meta = null;
	-
	- $type = self::type_activesync2kolab($type);
	-
	- // don't use kolab_storage for moving mail folders
	- if (preg_match('/^mail/', $type)) {
	- return $this->storage->rename_folder($old_name, $new_name);
	- }
	- else {
	- return kolab_storage::folder_rename($old_name, $new_name);
	- }
	- }
	-
	-
	- /**
	- * Deletes folder
	- *
	- * @param string $name Folder name (UTF7-IMAP)
	- * @param string $deviceid Device identifier
	- *
	- */
	- public function folder_delete($name, $deviceid)
	- {
	- unset($this->folder_meta[$name]);
	-
	- return kolab_storage::folder_delete($name);
	- }
	-
	-
	- /**
	- * Sets ActiveSync subscription flag on a folder
	- *
	- * @param string $name Folder name (UTF7-IMAP)
	- * @param string $deviceid Device identifier
	- * @param int $flag Flag value (0\|1\|2)
	- */
	- public function folder_set($name, $deviceid, $flag)
	- {
	- if (empty($deviceid)) {
	- return false;
	- }
	-
	- // get folders activesync config
	- $metadata = $this->folder_meta();
	-
	- if (!is_array($metadata)) {
	- return false;
	- }
	-
	- $metadata = isset($metadata[$name]) ? $metadata[$name] : array();
	-
	- if ($flag) {
	- if (empty($metadata)) {
	- $metadata = array();
	- }
	-
	- if (empty($metadata['FOLDER'])) {
	- $metadata['FOLDER'] = array();
	- }
	-
	- if (empty($metadata['FOLDER'][$deviceid])) {
	- $metadata['FOLDER'][$deviceid] = array();
	- }
	-
	- // Z-Push uses:
	- // 1 - synchronize, no alarms
	- // 2 - synchronize with alarms
	- $metadata['FOLDER'][$deviceid]['S'] = $flag;
	- }
	- else {
	- unset($metadata['FOLDER'][$deviceid]['S']);
	-
	- if (empty($metadata['FOLDER'][$deviceid])) {
	- unset($metadata['FOLDER'][$deviceid]);
	- }
	-
	- if (empty($metadata['FOLDER'])) {
	- unset($metadata['FOLDER']);
	- }
	-
	- if (empty($metadata)) {
	- $metadata = null;
	- }
	- }
	-
	- // Return if nothing's been changed
	- if (!self::data_array_diff(isset($this->folder_meta[$name]) ? $this->folder_meta[$name] : null, $metadata)) {
	- return true;
	- }
	-
	- $this->folder_meta[$name] = $metadata;
	-
	- return $this->storage->set_metadata($name, array(
	- self::ASYNC_KEY => $this->serialize_metadata($metadata)));
	- }
	-
	-
	- public function device_get($id)
	- {
	- $devices_list = $this->devices_list();
	- return $devices_list[$id] ?? null;
	- }
	-
	- /**
	- * Registers new device on server
	- *
	- * @param array $device Device data
	- * @param string $id Device ID
	- *
	- * @return bool True on success, False on failure
	- */
	- public function device_create($device, $id)
	- {
	- // Fill local cache
	- $this->devices_list();
	-
	- // Some devices create dummy devices with name "validate" (#1109)
	- // This device entry is used in two initial requests, but later
	- // the device registers a real name. We can remove this dummy entry
	- // on new device creation
	- $this->device_delete('validate');
	-
	- // Old Kolab_ZPush device parameters
	- // MODE: -1 \| 0 \| 1 (not set \| flatmode \| foldermode)
	- // TYPE: device type string
	- // ALIAS: user-friendly device name
	-
	- // Syncroton (kolab_sync_backend_device) uses
	- // ID: internal identifier in syncroton database
	- // TYPE: device type string
	- // ALIAS: user-friendly device name
	-
	- $metadata = $this->root_meta;
	- $metadata['DEVICE'][$id] = $device;
	- $metadata = array(self::ASYNC_KEY => $this->serialize_metadata($metadata));
	-
	- $result = $this->storage->set_metadata(self::ROOT_MAILBOX, $metadata);
	-
	- if ($result) {
	- // Update local cache
	- $this->root_meta['DEVICE'][$id] = $device;
	-
	- // subscribe default set of folders
	- $this->device_init_subscriptions($id);
	- }
	-
	- return $result;
	- }
	-
	- /**
	- * Device update.
	- *
	- * @param array $device Device data
	- * @param string $id Device ID
	- *
	- * @return bool True on success, False on failure
	- */
	- public function device_update($device, $id)
	- {
	- $devices_list = $this->devices_list();
	- $old_device = $devices_list[$id];
	-
	- if (!$old_device) {
	- return false;
	- }
	-
	- // Do nothing if nothing is changed
	- if (!self::data_array_diff($old_device, $device)) {
	- return true;
	- }
	-
	- $device = array_merge($old_device, $device);
	-
	- $metadata = $this->root_meta;
	- $metadata['DEVICE'][$id] = $device;
	- $metadata = array(self::ASYNC_KEY => $this->serialize_metadata($metadata));
	-
	- $result = $this->storage->set_metadata(self::ROOT_MAILBOX, $metadata);
	-
	- if ($result) {
	- // Update local cache
	- $this->root_meta['DEVICE'][$id] = $device;
	- }
	-
	- return $result;
	- }
	-
	-
	- /**
	- * Device delete.
	- *
	- * @param string $id Device ID
	- *
	- * @return bool True on success, False on failure
	- */
	- public function device_delete($id)
	- {
	- $device = $this->device_get($id);
	-
	- if (!$device) {
	- return false;
	- }
	-
	- unset($this->root_meta['DEVICE'][$id], $this->root_meta['FOLDER'][$id]);
	-
	- if (empty($this->root_meta['DEVICE'])) {
	- unset($this->root_meta['DEVICE']);
	- }
	- if (empty($this->root_meta['FOLDER'])) {
	- unset($this->root_meta['FOLDER']);
	- }
	-
	- $metadata = $this->serialize_metadata($this->root_meta);
	- $metadata = array(self::ASYNC_KEY => $metadata);
	-
	- // update meta data
	- $result = $this->storage->set_metadata(self::ROOT_MAILBOX, $metadata);
	-
	- if ($result) {
	- // remove device annotation for every folder
	- foreach ($this->folder_meta() as $folder => $meta) {
	- // skip root folder (already handled above)
	- if ($folder == self::ROOT_MAILBOX)
	- continue;
	-
	- if (!empty($meta['FOLDER']) && isset($meta['FOLDER'][$id])) {
	- unset($meta['FOLDER'][$id]);
	-
	- if (empty($meta['FOLDER'])) {
	- unset($this->folder_meta[$folder]['FOLDER']);
	- unset($meta['FOLDER']);
	- }
	- if (empty($meta)) {
	- unset($this->folder_meta[$folder]);
	- $meta = null;
	- }
	-
	- $metadata = array(self::ASYNC_KEY => $this->serialize_metadata($meta));
	- $res = $this->storage->set_metadata($folder, $metadata);
	-
	- if ($res && $meta) {
	- $this->folder_meta[$folder] = $meta;
	- }
	- }
	- }
	- }
	-
	- return $result;
	- }
	-
	- /**
	- * Subscribe default set of folders on device registration
	- */
	- private function device_init_subscriptions($deviceid)
	- {
	- // INBOX always exists
	- $this->folder_set('INBOX', $deviceid, 1);
	-
	- $supported_types = array(
	- 'mail.drafts',
	- 'mail.wastebasket',
	- 'mail.sentitems',
	- 'mail.outbox',
	- 'event.default',
	- 'contact.default',
	- 'note.default',
	- 'task.default',
	- 'event',
	- 'contact',
	- 'note',
	- 'task',
	- 'event.confidential',
	- 'event.private',
	- 'task.confidential',
	- 'task.private',
	- );
	-
	- // This default set can be extended by adding following values:
	- $modes = array(
	- 'SUB_PERSONAL' => 1, // all subscribed folders in personal namespace
	- 'ALL_PERSONAL' => 2, // all folders in personal namespace
	- 'SUB_OTHER' => 4, // all subscribed folders in other users namespace
	- 'ALL_OTHER' => 8, // all folders in other users namespace
	- 'SUB_SHARED' => 16, // all subscribed folders in shared namespace
	- 'ALL_SHARED' => 32, // all folders in shared namespace
	- );
	-
	- $rcube = rcube::get_instance();
	- $config = $rcube->config;
	- $mode = (int) $config->get('activesync_init_subscriptions');
	- $folders = array();
	-
	- // Subscribe to default folders
	- $foldertypes = kolab_storage::folders_typedata();
	-
	- if (!empty($foldertypes)) {
	- $_foldertypes = array_intersect($foldertypes, $supported_types);
	-
	- // get default folders
	- foreach ($_foldertypes as $folder => $type) {
	- // only personal folders
	- if ($this->storage->folder_namespace($folder) == 'personal') {
	- $flag = preg_match('/^(event\|task)/', $type) ? 2 : 1;
	- $this->folder_set($folder, $deviceid, $flag);
	- $folders[] = $folder;
	- }
	- }
	- }
	-
	- // we're in default mode, exit
	- if (!$mode) {
	- return;
	- }
	-
	- // below we support additionally all mail folders
	- $supported_types[] = 'mail';
	- $supported_types[] = 'mail.junkemail';
	-
	- // get configured special folders
	- $special_folders = array();
	- $map = array(
	- 'drafts' => 'mail.drafts',
	- 'junk' => 'mail.junkemail',
	- 'sent' => 'mail.sentitems',
	- 'trash' => 'mail.wastebasket',
	- );
	-
	- foreach ($map as $folder => $type) {
	- if ($folder = $config->get($folder . '_mbox')) {
	- $special_folders[$folder] = $type;
	- }
	- }
	-
	- // get folders list(s)
	- if (($mode & $modes['ALL_PERSONAL']) \|\| ($mode & $modes['ALL_OTHER']) \|\| ($mode & $modes['ALL_SHARED'])) {
	- $all_folders = $this->storage->list_folders();
	- if (($mode & $modes['SUB_PERSONAL']) \|\| ($mode & $modes['SUB_OTHER']) \|\| ($mode & $modes['SUB_SHARED'])) {
	- $subscribed_folders = $this->storage->list_folders_subscribed();
	- }
	- }
	- else {
	- $all_folders = $this->storage->list_folders_subscribed();
	- }
	-
	- foreach ($all_folders as $folder) {
	- // folder already subscribed
	- if (in_array($folder, $folders)) {
	- continue;
	- }
	-
	- $type = ($foldertypes[$folder] ?? null) ?: 'mail';
	- if ($type == 'mail' && isset($special_folders[$folder])) {
	- $type = $special_folders[$folder];
	- }
	-
	- if (!in_array($type, $supported_types)) {
	- continue;
	- }
	-
	- $ns = strtoupper($this->storage->folder_namespace($folder));
	-
	- // subscribe the folder according to configured mode
	- // and folder namespace/subscription status
	- if (($mode & $modes["ALL_$ns"])
	- \|\| (($mode & $modes["SUB_$ns"])
	- && (!isset($subscribed_folders) \|\| in_array($folder, $subscribed_folders)))
	- ) {
	- $flag = preg_match('/^(event\|task)/', $type) ? 2 : 1;
	- $this->folder_set($folder, $deviceid, $flag);
	- }
	- }
	- }
	-
	- /**
	- * Helper method to decode saved IMAP metadata
	- */
	- private function unserialize_metadata($str)
	- {
	- if (!empty($str)) {
	- // Support old Z-Push annotation format
	- if ($str[0] != '{') {
	- $str = base64_decode($str);
	- }
	- $data = json_decode($str, true);
	- return $data;
	- }
	-
	- return null;
	- }
	-
	- /**
	- * Helper method to encode IMAP metadata for saving
	- */
	- private function serialize_metadata($data)
	- {
	- if (!empty($data) && is_array($data)) {
	- $data = json_encode($data);
	-// $data = base64_encode($data);
	- return $data;
	- }
	-
	- return null;
	- }
	-
	- /**
	- * Returns Kolab folder type for specified ActiveSync type ID
	- */
	- public static function type_activesync2kolab($type)
	- {
	- if (!empty(self::$types[$type])) {
	- return self::$types[$type];
	- }
	-
	- return '';
	- }
	-
	- /**
	- * Returns ActiveSync folder type for specified Kolab type
	- */
	- public static function type_kolab2activesync($type)
	- {
	- $type = preg_replace('/\.(confidential\|private)$/i', '', $type);
	-
	- if ($key = array_search($type, self::$types)) {
	- return $key;
	- }
	-
	- return key(self::$types);
	- }
	-
	- /**
	- * Returns Kolab folder type for specified ActiveSync class name
	- */
	- public static function class_activesync2kolab($class)
	- {
	- if (!empty(self::$classes[$class])) {
	- return self::$classes[$class];
	- }
	-
	- return '';
	- }
	-
	- /**
	- * Returns folder data in Syncroton format
	- */
	- private function folder_data($folder, $type)
	- {
	- // Folder name parameters
	- $delim = $this->storage->get_hierarchy_delimiter();
	- $items = explode($delim, $folder);
	- $name = array_pop($items);
	-
	- // Folder UID
	- $folder_id = $this->folder_id($folder, $type);
	-
	- // Folder type
	- if (strcasecmp($folder, 'INBOX') === 0) {
	- // INBOX is always inbox, prevent from issues related with a change of
	- // folder type annotation (it can be initially unset).
	- $type = 2;
	- }
	- else {
	- $type = self::type_kolab2activesync($type);
	-
	- // fix type, if there's no type annotation it's detected as UNKNOWN we'll use 'mail' (12)
	- if ($type == 1) {
	- $type = 12;
	- }
	- }
	-
	- // Syncroton folder data array
	- return array(
	- 'serverId' => $folder_id,
	- 'parentId' => count($items) ? self::folder_id(implode($delim, $items)) : 0,
	- 'displayName' => rcube_charset::convert($name, 'UTF7-IMAP', kolab_sync::CHARSET),
	- 'type' => $type,
	- // for internal use
	- 'imap_name' => $folder,
	- );
	- }
	-
	- /**
	- * Builds folder ID based on folder name
	- */
	- public function folder_id($name, $type = null)
	- {
	- // ActiveSync expects folder identifiers to be max.64 characters
	- // So we can't use just folder name
	-
	- $name = (string) $name;
	-
	- if ($name === '') {
	- return null;
	- }
	-
	- if (isset($this->folder_uids[$name])) {
	- return $this->folder_uids[$name];
	- }
	-
	-/*
	- @TODO: For now uniqueid annotation doesn't work, we will create UIDs by ourselves.
	- There's one inconvenience of this solution: folder name/type change
	- would be handled in ActiveSync as delete + create.
	-
	- // get folders unique identifier
	- $folderdata = $this->storage->get_metadata($name, self::UID_KEY);
	-
	- if ($folderdata && !empty($folderdata[$name])) {
	- $uid = $folderdata[$name][self::UID_KEY];
	- return $this->folder_uids[$name] = $uid;
	- }
	-*/
	- if (strcasecmp($name, 'INBOX') === 0) {
	- // INBOX is always inbox, prevent from issues related with a change of
	- // folder type annotation (it can be initially unset).
	- $type = 'mail.inbox';
	- }
	- else {
	- if ($type === null) {
	- $type = kolab_storage::folder_type($name);
	- }
	-
	- if ($type != null) {
	- $type = preg_replace('/\.(confidential\|private)$/i', '', $type);
	- }
	- }
	-
	- // Add type to folder UID hash, so type change can be detected by Syncroton
	- $uid = $name . '!!' . $type;
	- $uid = md5($uid);
	-
	- return $this->folder_uids[$name] = $uid;
	- }
	-
	- /**
	- * Returns IMAP folder name
	- *
	- * @param string $id Folder identifier
	- * @param string $deviceid Device dentifier
	- *
	- * @return string Folder name (UTF7-IMAP)
	- */
	- public function folder_id2name($id, $deviceid)
	- {
	- // check in cache first
	- if (!empty($this->folder_uids)) {
	- if (($name = array_search($id, $this->folder_uids)) !== false) {
	- return $name;
	- }
	- }
	-
	-/*
	- @TODO: see folder_id()
	-
	- // get folders unique identifier
	- $folderdata = $this->storage->get_metadata('*', self::UID_KEY);
	-
	- foreach ((array)$folderdata as $folder => $data) {
	- if (!empty($data[self::UID_KEY])) {
	- $uid = $data[self::UID_KEY];
	- $this->folder_uids[$folder] = $uid;
	- if ($uid == $id) {
	- $name = $folder;
	- }
	- }
	- }
	-*/
	- // get all folders of specified type
	- $folderdata = $this->folder_meta();
	-
	- if (!is_array($folderdata) \|\| $id === null) {
	- return null;
	- }
	-
	- // check if folders are "subscribed" for activesync
	- foreach ($folderdata as $folder => $meta) {
	- if (empty($meta['FOLDER']) \|\| empty($meta['FOLDER'][$deviceid])
	- \|\| empty($meta['FOLDER'][$deviceid]['S'])
	- ) {
	- continue;
	- }
	-
	- if ($uid = self::folder_id($folder)) {
	- $this->folder_uids[$folder] = $uid;
	- }
	-
	- if ($uid === $id) {
	- $name = $folder;
	- }
	- }
	-
	- return $name;
	- }
	-
	- /**
	- */
	- public function modseq_set($deviceid, $folderid, $synctime, $data)
	- {
	- $synctime = $synctime->format('Y-m-d H:i:s');
	- $rcube = rcube::get_instance();
	- $db = $rcube->get_dbh();
	- $old_data = $this->modseq[$folderid][$synctime] ?? null;
	-
	- if (empty($old_data)) {
	- $this->modseq[$folderid][$synctime] = $data;
	- $data = json_encode($data);
	-
	- $db->set_option('ignore_key_errors', true);
	- $db->query("INSERT INTO `syncroton_modseq` (`device_id`, `folder_id`, `synctime`, `data`)"
	- ." VALUES (?, ?, ?, ?)",
	- $deviceid, $folderid, $synctime, $data);
	- $db->set_option('ignore_key_errors', false);
	- }
	- }
	-
	- public function modseq_get($deviceid, $folderid, $synctime)
	- {
	- $synctime = $synctime->format('Y-m-d H:i:s');
	-
	- if (empty($this->modseq[$folderid][$synctime])) {
	- $this->modseq[$folderid] = array();
	-
	- $rcube = rcube::get_instance();
	- $db = $rcube->get_dbh();
	-
	- $db->limitquery("SELECT `data`, `synctime` FROM `syncroton_modseq`"
	- ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <= ?"
	- ." ORDER BY `synctime` DESC",
	- 0, 1, $deviceid, $folderid, $synctime);
	-
	- if ($row = $db->fetch_assoc()) {
	- $synctime = $row['synctime'];
	- // @TODO: make sure synctime from sql is in "Y-m-d H:i:s" format
	- $this->modseq[$folderid][$synctime] = json_decode($row['data'], true);
	- }
	-
	- // Cleanup: remove all records except the current one
	- $db->query("DELETE FROM `syncroton_modseq`"
	- ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <> ?",
	- $deviceid, $folderid, $synctime);
	- }
	-
	- return @$this->modseq[$folderid][$synctime];
	- }
	-
	- /**
	- * Set state of relation objects at specified point in time
	- */
	- public function relations_state_set($deviceid, $folderid, $synctime, $relations)
	- {
	- $synctime = $synctime->format('Y-m-d H:i:s');
	- $rcube = rcube::get_instance();
	- $db = $rcube->get_dbh();
	- $old_data = $this->relations[$folderid][$synctime] ?? null;
	-
	- if (empty($old_data)) {
	- $this->relations[$folderid][$synctime] = $relations;
	- $data = rcube_charset::clean(json_encode($relations));
	-
	- $db->set_option('ignore_key_errors', true);
	- $db->query("INSERT INTO `syncroton_relations_state`"
	- ." (`device_id`, `folder_id`, `synctime`, `data`)"
	- ." VALUES (?, ?, ?, ?)",
	- $deviceid, $folderid, $synctime, $data);
	- $db->set_option('ignore_key_errors', false);
	- }
	- }
	-
	- /**
	- * Get state of relation objects at specified point in time
	- */
	- public function relations_state_get($deviceid, $folderid, $synctime)
	- {
	- $synctime = $synctime->format('Y-m-d H:i:s');
	-
	- if (empty($this->relations[$folderid][$synctime])) {
	- $this->relations[$folderid] = array();
	-
	- $rcube = rcube::get_instance();
	- $db = $rcube->get_dbh();
	-
	- $db->limitquery("SELECT `data`, `synctime` FROM `syncroton_relations_state`"
	- ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <= ?"
	- ." ORDER BY `synctime` DESC",
	- 0, 1, $deviceid, $folderid, $synctime);
	-
	- if ($row = $db->fetch_assoc()) {
	- $synctime = $row['synctime'];
	- // @TODO: make sure synctime from sql is in "Y-m-d H:i:s" format
	- $this->relations[$folderid][$synctime] = json_decode($row['data'], true);
	- }
	-
	- // Cleanup: remove all records except the current one
	- $db->query("DELETE FROM `syncroton_relations_state`"
	- ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <> ?",
	- $deviceid, $folderid, $synctime);
	- }
	-
	- return @$this->relations[$folderid][$synctime];
	- }
	-
	- /**
	- * Return last storage error
	- */
	- public static function last_error()
	- {
	- return kolab_storage::$last_error;
	- }
	-
	- /**
	- * Compares two arrays
	- *
	- * @param array $array1
	- * @param array $array2
	- *
	- * @return bool True if arrays differs, False otherwise
	- */
	- private static function data_array_diff($array1, $array2)
	- {
	- if (!is_array($array1) \|\| !is_array($array2)) {
	- return $array1 != $array2;
	- }
	-
	- if (count($array1) != count($array2)) {
	- return true;
	- }
	-
	- foreach ($array1 as $key => $val) {
	- if (!array_key_exists($key, $array2)) {
	- return true;
	- }
	- if ($val !== $array2[$key]) {
	- return true;
	- }
	- }
	-
	- return false;
	- }
	-}
	diff --git a/lib/kolab_sync_backend_device.php b/lib/kolab_sync_backend_device.php
	--- a/lib/kolab_sync_backend_device.php
	+++ b/lib/kolab_sync_backend_device.php
	@@ -45,7 +45,7 @@
	public function __construct()
	{
	parent::__construct();
	- $this->backend = kolab_sync_backend::get_instance();
	+ $this->backend = kolab_sync::storage();
	}

	/**
	diff --git a/lib/kolab_sync_data.php b/lib/kolab_sync_data.php
	--- a/lib/kolab_sync_data.php
	+++ b/lib/kolab_sync_data.php
	@@ -78,18 +78,11 @@
	protected $folderType;

	/**
	- * Internal cache for kolab_storage folder objects
	+ * Internal cache for storage folders list
	*
	* @var array
	*/
	- protected $folders = array();
	-
	- /**
	- * Internal cache for IMAP folders list
	- *
	- * @var array
	- */
	- protected $imap_folders = array();
	+ protected $folders = [];

	/**
	* Logger instance.
	@@ -120,6 +113,9 @@
	'playbook',
	);

	+ protected $lastsync_folder = null;
	+ protected $lastsync_time = null;
	+
	const RESULT_OBJECT = 0;
	const RESULT_UID = 1;
	const RESULT_COUNT = 2;
	@@ -185,10 +181,10 @@
	*/
	public function __construct(Syncroton_Model_IDevice $device, DateTime $syncTimeStamp)
	{
	- $this->backend = kolab_sync_backend::get_instance();
	+ $this->backend = kolab_sync::storage();
	$this->device = $device;
	$this->asversion = floatval($device->acsversion);
	- $this->syncTimeStamp = $syncTimeStamp;
	+ $this->syncTimeStamp = $this->backend->syncTimeStamp = $syncTimeStamp;
	$this->logger = Syncroton_Registry::get(Syncroton_Registry::LOGGERBACKEND);

	$this->defaultRootFolder = $this->defaultFolder . '::Syncroton';
	@@ -246,6 +242,8 @@
	*/
	public function getChangedFolders(DateTime $startTimeStamp, DateTime $endTimeStamp)
	{
	+ // FIXME/TODO: Can we get mtime of a DAV folder?
	+ // Without this, we have a problem if folder ID does not change on rename
	return array();
	}

	@@ -289,8 +287,7 @@

	// Return first on the list if there's no default
	if (empty($default)) {
	- $key = array_shift(array_keys($folders));
	- $default = $folders[$key];
	+ $default = array_first($folders);
	// make sure the type is default here
	$default['type'] = $this->defaultFolderType;
	}
	@@ -308,47 +305,16 @@
	*/
	public function createFolder(Syncroton_Model_IFolder $folder)
	{
	- $parentid = $folder->parentId;
	- $type = $folder->type;
	- $display_name = $folder->displayName;
	- $parent = null;
	-
	- if ($parentid) {
	- $parent = $this->backend->folder_id2name($parentid, $this->device->deviceid);
	-
	- if ($parent === null) {
	- throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::PARENT_NOT_FOUND);
	- }
	- }
	-
	- $name = rcube_charset::convert($display_name, kolab_sync::CHARSET, 'UTF7-IMAP');
	-
	- if ($parent !== null) {
	- $rcube = rcube::get_instance();
	- $storage = $rcube->get_storage();
	- $delim = $storage->get_hierarchy_delimiter();
	- $name = $parent . $delim . $name;
	- }
	-
	- // Create IMAP folder
	- $result = $this->backend->folder_create($name, $type, $this->device->deviceid);
	+ $result = $this->backend->folder_create($folder->displayName, $folder->type, $this->device->deviceid, $folder->parentId);

	if ($result) {
	- $folder->serverId = $this->backend->folder_id($name);
	+ $folder->serverId = $result;
	return $folder;
	}

	- $errno = Syncroton_Exception_Status_FolderCreate::UNKNOWN_ERROR;
	-
	- // Special case when client tries to create a subfolder of INBOX
	- // which is not possible on Cyrus-IMAP (T2223)
	- if ($parent == 'INBOX' && stripos($this->backend->last_error(), 'invalid') !== false) {
	- $errno = Syncroton_Exception_Status_FolderCreate::SPECIAL_FOLDER;
	- }
	-
	// Note: Looks like Outlook 2013 ignores any errors on FolderCreate command

	- throw new Syncroton_Exception_Status_FolderCreate($errno);
	+ throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::UNKNOWN_ERROR);
	}

	/**
	@@ -356,32 +322,7 @@
	*/
	public function updateFolder(Syncroton_Model_IFolder $folder)
	{
	- $parentid = $folder->parentId;
	- $type = $folder->type;
	- $display_name = $folder->displayName;
	- $old_name = $this->backend->folder_id2name($folder->serverId, $this->device->deviceid);
	-
	- if ($parentid) {
	- $parent = $this->backend->folder_id2name($parentid, $this->device->deviceid);
	- }
	-
	- $name = rcube_charset::convert($display_name, kolab_sync::CHARSET, 'UTF7-IMAP');
	-
	- if ($parent !== null) {
	- $rcube = rcube::get_instance();
	- $storage = $rcube->get_storage();
	- $delim = $storage->get_hierarchy_delimiter();
	- $name = $parent . $delim . $name;
	- }
	-
	- // Rename/move IMAP folder
	- if ($name == $old_name) {
	- $result = true;
	- // @TODO: folder type change?
	- }
	- else {
	- $result = $this->backend->folder_rename($old_name, $name, $type);
	- }
	+ $result = $this->backend->folder_rename($folder->serverId, $this->device->deviceid, $folder->displayName, $folder->parentId);

	if ($result) {
	return $folder;
	@@ -399,10 +340,8 @@
	$folder = $folder->serverId;
	}

	- $name = $this->backend->folder_id2name($folder, $this->device->deviceid);
	-
	// @TODO: throw exception
	- return $this->backend->folder_delete($name, $this->device->deviceid);
	+ return $this->backend->folder_delete($folder, $this->device->deviceid);
	}

	/**
	@@ -413,39 +352,16 @@
	*/
	public function emptyFolderContents($folderid, $options)
	{
	- $folders = $this->extractFolders($folderid);
	-
	- foreach ($folders as $folderid) {
	- $foldername = $this->backend->folder_id2name($folderid, $this->device->deviceid);
	- $folder = $this->getFolderObject($foldername);
	-
	- if (!$folder \|\| !$folder->valid) {
	+ // ActiveSync spec.: Clients use EmptyFolderContents to empty the Deleted Items folder.
	+ // The client can clear out all items in the Deleted Items folder when the user runs out of storage quota
	+ // (indicated by the return of an MailboxQuotaExceeded (113) status code from the server.
	+ // FIXME: Does that mean we don't need this to work on any other folder?
	+ // TODO: Respond with MailboxQuotaExceeded status. Where exactly?
	+
	+ foreach ($this->extractFolders($folderid) as $folderid) {
	+ if (!$this->backend->folder_empty($folderid, $this->device->deviceid, !empty($options['deleteSubFolders']))) {
	throw new Syncroton_Exception_Status_ItemOperations(Syncroton_Exception_Status_ItemOperations::ITEM_SERVER_ERROR);
	}
	-
	- // Remove all entries
	- $folder->delete_all();
	-
	- // Remove subfolders
	- if (!empty($options['deleteSubFolders'])) {
	- $list = $this->listFolders($folderid);
	-
	- if (!is_array($list)) {
	- throw new Syncroton_Exception_Status_ItemOperations(Syncroton_Exception_Status_ItemOperations::ITEM_SERVER_ERROR);
	- }
	-
	- foreach ($list as $folderid => $folder) {
	- $foldername = $this->backend->folder_id2name($folderid, $this->device->deviceid);
	- $folder = $this->getFolderObject($foldername);
	-
	- if (!$folder \|\| !$folder->valid) {
	- throw new Syncroton_Exception_Status_ItemOperations(Syncroton_Exception_Status_ItemOperations::ITEM_SERVER_ERROR);
	- }
	-
	- // Remove all entries
	- $folder->delete_all();
	- }
	- }
	}
	}

	@@ -461,12 +377,14 @@
	*/
	public function moveItem($srcFolderId, $serverId, $dstFolderId)
	{
	- $item = $this->getObject($srcFolderId, $serverId, $folder);
	+ $item = $this->getObject($srcFolderId, $serverId);

	- if (!$item \|\| !$folder) {
	+ if (!$item) {
	throw new Syncroton_Exception_Status_MoveItems(Syncroton_Exception_Status_MoveItems::INVALID_SOURCE);
	}

	+ // TODO
	+ /*
	$dstname = $this->backend->folder_id2name($dstFolderId, $this->device->deviceid);

	if ($dstname === null) {
	@@ -478,6 +396,7 @@
	}

	return $item['uid'];
	+ */
	}

	/**
	@@ -543,14 +462,19 @@
	}
	}

	-
	+ /**
	+ * Get attachment data from the server.
	+ *
	+ * @param string $fileReference
	+ *
	+ * @return Syncroton_Model_FileReference
	+ */
	public function getFileReference($fileReference)
	{
	// to be implemented by Email data class
	// @TODO: throw "unimplemented" exception here?
	}

	-
	/**
	* Search for existing entries
	*
	@@ -562,243 +486,42 @@
	*/
	protected function searchEntries($folderid, $filter = array(), $result_type = self::RESULT_UID)
	{
	- if ($folderid == $this->defaultRootFolder) {
	- $folders = $this->listFolders();
	-
	- if (!is_array($folders)) {
	- throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	- }
	-
	- $folders = array_keys($folders);
	- }
	- else {
	- $folders = array($folderid);
	- }
	+ $folders = $this->extractFolders($folderid);

	- // there's a PHP Warning from kolab_storage if $filter isn't an array
	- if (empty($filter)) {
	- $filter = array();
	- }
	- else {
	- $changed_objects = $this->getChangesByRelations($folderid, $filter);
	+ if ($folders === null) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	}

	- $result = $result_type == self::RESULT_COUNT ? 0 : array();
	- $found = 0;
	-
	- foreach ($folders as $folder_id) {
	- $foldername = $this->backend->folder_id2name($folder_id, $this->device->deviceid);
	- $folder = $this->getFolderObject($foldername);
	+ $result = $result_type == self::RESULT_COUNT ? 0 : [];
	+ $ts = time();
	+ $force = $this->lastsync_folder != $folderid \|\| $this->lastsync_time <= $ts - Syncroton_Registry::getPingTimeout();
	+ $tags = isset($this->tag_categories) && !$this->tag_categories;
	+ $found = false;

	- if (!$folder \|\| !$folder->valid) {
	- throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	- }
	-
	- $found++;
	- $error = false;
	+ foreach ($folders as $folderid) {
	+ $search = $this->backend->searchEntries($folderid, $this->device->id, $this->modelName, $filter, $result_type, $force, $tags);
	+ $found = true;

	switch ($result_type) {
	case self::RESULT_COUNT:
	- $count = $folder->count($filter);
	-
	- if ($count === null \|\| $count === false) {
	- $error = true;
	- }
	- else {
	- $result += (int) $count;
	- }
	+ $result += $search;
	break;

	case self::RESULT_UID:
	- $uids = $folder->get_uids($filter);
	-
	- if (!is_array($uids)) {
	- $error = true;
	- }
	- else if (!empty($uids)) {
	- $result = array_merge($result, $this->applyServerId($uids, $folder));
	+ foreach ($search as $idx => $uid) {
	+ $search[$idx] = $this->serverId($uid, $folderid);
	}
	+ $result = array_unique(array_merge($result, $search));
	break;
	}
	-
	- if ($error) {
	- throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	- }
	-
	- // handle tag modifications
	- if (!empty($changed_objects)) {
	- // build new filter
	- // search objects mathing current filter,
	- // relations may contain members of many types, we need to
	- // search them by UID in all requested folders to get
	- // only these with requested type (and that really exist
	- // in specified folders)
	- $tag_filter = array(array('uid', '=', $changed_objects));
	- foreach ($filter as $f) {
	- if ($f[0] != 'changed') {
	- $tag_filter[] = $f;
	- }
	- }
	-
	- switch ($result_type) {
	- case self::RESULT_COUNT:
	- // Note: this way we're potentally counting the same objects twice
	- // I'm not sure if this is a problem, we most likely do not
	- // need a precise result here
	- $count = $folder->count($tag_filter);
	- if ($count !== null && $count !== false) {
	- $result += (int) $count;
	- }
	-
	- break;
	-
	- case self::RESULT_UID:
	- $uids = $folder->get_uids($tag_filter);
	- if (is_array($uids) && !empty($uids)) {
	- $result = array_unique(array_merge($result, $this->applyServerId($uids, $folder)));
	- }
	-
	- break;
	- }
	- }
	}

	if (!$found) {
	throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	}

	- return $result;
	- }
	-
	- /**
	- * Detect changes of relation (tag) objects data and assigned objects
	- * Returns relation member identifiers
	- */
	- protected function getChangesByRelations($folderid, $filter)
	- {
	- if (isset($this->tag_categories) && !$this->tag_categories) {
	- return;
	- }
	-
	- // get period filter, create new objects filter
	- foreach ($filter as $f) {
	- if ($f[0] == 'changed' && $f[1] == '>') {
	- $since = $f[2];
	- }
	- }
	-
	- // this is not search for changes, do nothing
	- if (empty($since)) {
	- return;
	- }
	-
	- // get relations state from the last sync
	- $last_state = (array) $this->backend->relations_state_get($this->device->id, $folderid, $since);
	-
	- // get current relations state
	- $config = kolab_storage_config::get_instance();
	- $default = true;
	- $filter = array(
	- array('type', '=', 'relation'),
	- array('category', '=', 'tag')
	- );
	-
	- $relations = $config->get_objects($filter, $default, 100);
	-
	- $result = array();
	- $changed = false;
	-
	- // compare states, get members of changed relations
	- foreach ($relations as $relation) {
	- $rel_id = $relation['uid'];
	-
	- if ($relation['changed']) {
	- $relation['changed']->setTimezone(new DateTimeZone('UTC'));
	- }
	-
	- // last state unknown...
	- if (empty($last_state[$rel_id])) {
	- // ...get all members
	- if (!empty($relation['members'])) {
	- $changed = true;
	- $result = array_merge($result, $relation['members']);
	- }
	- }
	- // last state known, changed tag name...
	- else if ($last_state[$rel_id]['name'] != $relation['name']) {
	- // ...get all (old and new) members
	- $members_old = explode("\n", $last_state[$rel_id]['members']);
	- $changed = true;
	- $members = array_unique(array_merge($relation['members'], $members_old));
	- $result = array_merge($result, $members);
	- }
	- // last state known, any other change change...
	- else if ($last_state[$rel_id]['changed'] < $relation['changed']->format('U')) {
	- // ...find new and removed members
	- $members_old = explode("\n", $last_state[$rel_id]['members']);
	- $new = array_diff($relation['members'], $members_old);
	- $removed = array_diff($members_old, $relation['members']);
	-
	- if (!empty($new) \|\| !empty($removed)) {
	- $changed = true;
	- $result = array_merge($result, $new, $removed);
	- }
	- }
	-
	- unset($last_state[$rel_id]);
	- }
	-
	- // get members of deleted relations
	- if (!empty($last_state)) {
	- $changed = true;
	- foreach ($last_state as $relation) {
	- $members = explode("\n", $relation['members']);
	- $result = array_merge($result, $members);
	- }
	- }
	-
	- // save current state
	- if ($changed) {
	- $data = array();
	- foreach ($relations as $relation) {
	- $data[$relation['uid']] = array(
	- 'name' => $relation['name'],
	- 'changed' => $relation['changed']->format('U'),
	- 'members' => implode("\n", (array)$relation['members']),
	- );
	- }
	-
	- $now = new DateTime('now', new DateTimeZone('UTC'));
	-
	- $this->backend->relations_state_set($this->device->id, $folderid, $now, $data);
	- }
	-
	- // in mail mode return only message URIs
	- if ($this->modelName == 'mail') {
	- // lambda function to skip email members
	- $filter_func = function($value) {
	- return strpos($value, 'imap://') === 0;
	- };
	-
	- $result = array_filter(array_unique($result), $filter_func);
	- }
	- // otherwise return only object UIDs
	- else {
	- // lambda function to skip email members
	- $filter_func = function($value) {
	- return strpos($value, 'urn:uuid:') === 0;
	- };
	-
	- // lambda function to parse member URI
	- $member_func = function($value) {
	- if (strpos($value, 'urn:uuid:') === 0) {
	- $value = substr($value, 9);
	- }
	- return $value;
	- };
	-
	- $result = array_map($member_func, array_filter(array_unique($result), $filter_func));
	- }
	+ $this->lastsync_folder = $folderid;
	+ $this->lastsync_time = $ts;

	return $result;
	}
	@@ -949,7 +672,7 @@
	/**
	* Fetches the entry from the backend
	*/
	- protected function getObject($folderid, $entryid, &$folder = null)
	+ protected function getObject($folderid, $entryid)
	{
	$folders = $this->extractFolders($folderid);

	@@ -958,41 +681,38 @@
	}

	foreach ($folders as $folderid) {
	- $foldername = $this->backend->folder_id2name($folderid, $this->device->deviceid);
	- $folder = $this->getFolderObject($foldername);
	-
	- if ($folder && $folder->valid) {
	- $crc = null;
	- $uid = $entryid;
	-
	- // See self::serverId() for full explanation
	- // Use (slower) UID prefix matching...
	- if (preg_match('/^CRC([0-9A-Fa-f]{8})(.+)$/', $uid, $matches)) {
	- $crc = $matches[1];
	- $uid = $matches[2];
	-
	- if (strlen($entryid) >= 64) {
	- foreach ($folder->select(array(array('uid', '~*', $uid))) as $object) {
	- if (($object['uid'] == $uid \|\| strpos($object['uid'], $uid) === 0)
	- && $crc == $this->objectCRC($object['uid'], $folder)
	- ) {
	- $object['_folderid'] = $folderid;
	- return $object;
	- }
	+ $crc = null;
	+ $uid = $entryid;
	+
	+ // See self::serverId() for full explanation
	+ // Use (slower) UID prefix matching...
	+ if (preg_match('/^CRC([0-9A-Fa-f]{8})(.+)$/', $uid, $matches)) {
	+ $crc = $matches[1];
	+ $uid = $matches[2];
	+
	+ if (strlen($entryid) >= 64) {
	+ $objects = $this->backend->getObjectsByUidPrefix($folderid, $this->device->deviceid, $this->modelName, $uid);
	+
	+ foreach ($objects as $object) {
	+ if (($object['uid'] === $uid \|\| strpos($object['uid'], $uid) === 0)
	+ && $crc == $this->objectCRC($object['uid'], $folderid)
	+ ) {
	+ $object['folderId'] = $folderid;
	+ return $object;
	}
	-
	- continue;
	}
	- }

	- // Or (faster) strict UID matching...
	- if (($object = $folder->get_object($uid))
	- && ($crc === null \|\| $crc == $this->objectCRC($object['uid'], $folder))
	- ) {
	- $object['_folderid'] = $folderid;
	- return $object;
	+ continue;
	}
	}
	+
	+ // Or (faster) strict UID matching...
	+ $object = $this->backend->getObject($folderid, $this->device->deviceid, $this->modelName, $uid);
	+
	+ if (!empty($object) && ($crc === null \|\| $crc == $this->objectCRC($object['uid'], $folderid))) {
	+ $object['folderId'] = $folderid;
	+ return $object;
	+ }
	}
	}

	@@ -1017,8 +737,7 @@
	unset($data['categories']);
	}

	- $foldername = $this->backend->folder_id2name($folderid, $this->device->deviceid);
	- $folder = $this->getFolderObject($foldername);
	+ $folder = $this->backend->getFolder($folderid, $this->device->deviceid, $this->modelName);

	// Set User-Agent for saved objects
	$app = kolab_sync::get_instance();
	@@ -1026,10 +745,10 @@

	if ($folder && $folder->valid && $folder->save($data)) {
	if (!empty($tags)) {
	- $this->setKolabTags($data['uid'], $tags);
	+ $this->backend->setCategories($data['uid'], $tags);
	}

	- $data['_serverId'] = $this->serverId($data['uid'], $folder);
	+ $data['_serverId'] = $this->serverId($data['uid'], $folderid);

	return $data;
	}
	@@ -1043,7 +762,7 @@
	$object = $this->getObject($folderid, $entryid);

	if ($object) {
	- $folder = $this->getFolderObject($object['_mailbox']);
	+ $folder = $this->backend->getFolder($object['folderId'], $this->device->deviceid, $this->modelName);

	// convert categories into tags, save them after updating an object
	if (isset($this->tag_categories) && $this->tag_categories && array_key_exists('categories', $data)) {
	@@ -1055,12 +774,12 @@
	$app = kolab_sync::get_instance();
	$app->config->set('useragent', $app->app_name . ' ' . kolab_sync::VERSION);

	- if ($folder && $folder->valid && $folder->save($data)) {
	+ if ($folder && $folder->valid && $folder->save($data, $this->modelName, $object['uid'])) {
	if (isset($tags)) {
	- $this->setKolabTags($data['uid'], $tags);
	+ $this->backend->setCategories($data['uid'], $tags);
	}

	- $data['_serverId'] = $this->serverId($object['uid'], $folder);
	+ $data['_serverId'] = $this->serverId($object['uid'], $object['folderId']);

	return $data;
	}
	@@ -1075,11 +794,11 @@
	$object = $this->getObject($folderid, $entryid);

	if ($object) {
	- $folder = $this->getFolderObject($object['_mailbox']);
	+ $folder = $this->backend->getFolder($object['folderId'], $this->device->deviceid, $this->modelName);

	if ($folder && $folder->valid && $folder->delete($object['uid'])) {
	if (isset($this->tag_categories) && $this->tag_categories) {
	- $this->setKolabTags($object['uid'], null);
	+ $this->backend->setCategories($object['uid'], []);
	}

	return true;
	@@ -1130,19 +849,19 @@
	*/
	protected function listFolders($parentid = null)
	{
	- if (empty($this->imap_folders)) {
	- $this->imap_folders = $this->backend->folders_list(
	+ if (empty($this->folders)) {
	+ $this->folders = $this->backend->folders_list(
	$this->device->deviceid, $this->modelName, $this->isMultiFolder());
	}

	- if ($parentid === null \|\| !is_array($this->imap_folders)) {
	- return $this->imap_folders;
	+ if ($parentid === null \|\| !is_array($this->folders)) {
	+ return $this->folders;
	}

	- $folders = array();
	- $parents = array($parentid);
	+ $folders = [];
	+ $parents = [$parentid];

	- foreach ($this->imap_folders as $folder_id => $folder) {
	+ foreach ($this->folders as $folder_id => $folder) {
	if ($folder['parentId'] && in_array($folder['parentId'], $parents)) {
	$folders[$folder_id] = $folder;
	$parents[] = $folder_id;
	@@ -1152,77 +871,16 @@
	return $folders;
	}

	- /**
	- * Returns Folder object (uses internal cache)
	- *
	- * @param string $name Folder name (UTF7-IMAP)
	- *
	- * @return kolab_storage_folder Folder object
	- */
	- protected function getFolderObject($name)
	- {
	- if ($name === null \|\| $name === '') {
	- return null;
	- }
	-
	- if (!isset($this->folders[$name])) {
	- $this->folders[$name] = kolab_storage::get_folder($name, $this->modelName);
	- }
	-
	- return $this->folders[$name];
	- }
	-
	/**
	* Returns ActiveSync settings of specified folder
	*
	- * @param string $name Folder name (UTF7-IMAP)
	+ * @param string $folderid Folder identifier
	*
	* @return array Folder settings
	*/
	- protected function getFolderConfig($name)
	+ protected function getFolderConfig($folderid)
	{
	- $metadata = $this->backend->folder_meta();
	-
	- if (!is_array($metadata)) {
	- return array();
	- }
	-
	- $deviceid = $this->device->deviceid;
	- $config = $metadata[$name]['FOLDER'][$deviceid];
	-
	- return array(
	- 'ALARMS' => $config['S'] == 2,
	- );
	- }
	-
	- /**
	- * Returns real folder name for specified folder ID
	- */
	- protected function getFolderName($folderid)
	- {
	- if ($folderid == $this->defaultRootFolder) {
	- $default = $this->getDefaultFolder();
	-
	- if (!is_array($default)) {
	- return null;
	- }
	-
	- $folderid = isset($default['realid']) ? $default['realid'] : $default['serverId'];
	- }
	-
	- return $this->backend->folder_id2name($folderid, $this->device->deviceid);
	- }
	-
	- /**
	- * Returns folder ID from Kolab folder object
	- */
	- protected function getFolderId($folder)
	- {
	- if (!$this->isMultiFolder()) {
	- return $this->defaultRootFolder;
	- }
	-
	- return $this->backend->folder_id($folder->get_name(), $folder->get_type());
	+ return $this->backend->getFolderConfig($folderid, $this->device->deviceid, $this->modelName);
	}

	/**
	@@ -1876,32 +1534,6 @@
	}
	}

	- /**
	- * Returns list of tag names assigned to kolab object
	- */
	- protected function getKolabTags($uid, $categories = null)
	- {
	- $config = kolab_storage_config::get_instance();
	- $tags = $config->get_tags($uid);
	- $tags = array_filter(array_map(function($v) { return $v['name']; }, $tags));
	-
	- // merge result with old categories
	- if (!empty($categories)) {
	- $tags = array_unique(array_merge($tags, (array) $categories));
	- }
	-
	- return $tags;
	- }
	-
	- /**
	- * Set tags to kolab object
	- */
	- protected function setKolabTags($uid, $tags)
	- {
	- $config = kolab_storage_config::get_instance();
	- $config->save_tags($uid, $tags);
	- }
	-
	/**
	* Converts string of days (TU,TH) to bitmask used by ActiveSync
	*
	@@ -1980,10 +1612,6 @@
	*/
	protected function serverId($uid, $folder)
	{
	- if ($this->modelName == 'mail') {
	- return $uid;
	- }
	-
	// When ActiveSync communicates with the client, it refers to objects with a ServerId
	// We can't use object UID for ServerId because:
	// - ServerId is limited to 64 chars,
	@@ -2014,25 +1642,11 @@
	protected function objectCRC($uid, $folder)
	{
	if (!is_object($folder)) {
	- $folder = $this->getFolderObject($folder);
	+ $folder = $this->backend->getFolder($folder, $this->device->deviceid, $this->modelName);
	}

	$folder_uid = $folder->get_uid();

	return strtoupper(hash('crc32b', $folder_uid . $uid)); // always 8 chars
	}
	-
	- /**
	- * Apply serverId() on a set of uids
	- */
	- protected function applyServerId($uids, $folder)
	- {
	- if (!empty($uids) && $this->modelName != 'mail') {
	- $self = $this;
	- $func = function($uid) use ($self, $folder) { return $self->serverId($uid, $folder); };
	- $uids = array_map($func, $uids);
	- }
	-
	- return $uids;
	- }
	}
	diff --git a/lib/kolab_sync_data_calendar.php b/lib/kolab_sync_data_calendar.php
	--- a/lib/kolab_sync_data_calendar.php
	+++ b/lib/kolab_sync_data_calendar.php
	@@ -182,7 +182,7 @@
	public function getEntry(Syncroton_Model_SyncCollection $collection, $serverId, $as_array = false)
	{
	$event = is_array($serverId) ? $serverId : $this->getObject($collection->collectionId, $serverId);
	- $config = $this->getFolderConfig($event['_mailbox']);
	+ $config = $this->getFolderConfig($event['folderId']);
	$result = array();
	$is_outlook = stripos($this->device->devicetype, 'outlook') !== false;
	$is_android = stripos($this->device->devicetype, 'android') !== false;
	@@ -368,14 +368,14 @@
	*/
	public function toKolab(Syncroton_Model_IEntry $data, $folderid, $entry = null, $timezone = null)
	{
	- $foldername = isset($entry['_mailbox']) ? $entry['_mailbox'] : $this->getFolderName($folderid);
	- if (empty($entry)) {
	+ $config = [];
	+
	+ if (empty($entry) && !empty($data->uID)) {
	// If we don't have an existing event (not a modification) we nevertheless check for conflicts.
	// This is necessary so we don't overwrite the server-side copy in case the client did not have it available
	// when generating an Add command.
	try {
	- $folder = $this->getFolderObject($foldername);
	- $entry = $folder->get_object($data->uID);
	+ $entry = $this->getObject($folderid, $data->uID);

	if ($entry) {
	$this->logger->debug('Found and existing event for UID: ' . $data->uID);
	@@ -384,8 +384,12 @@
	// uID is not available on exceptions, so we guard for that and silently ignore.
	}
	}
	- $event = !empty($entry) ? $entry : array();
	- $config = $this->getFolderConfig($foldername);
	+
	+ if (!empty($entry['folderId'])) {
	+ $config = $this->getFolderConfig($entry['folderId']);
	+ }
	+
	+ $event = !empty($entry) ? $entry : [];
	$is_exception = $data instanceof Syncroton_Model_EventException;
	$dummy_tz = str_repeat('A', 230) . '==';
	$is_outlook = stripos($this->device->devicetype, 'outlook') !== false;
	@@ -695,12 +699,10 @@

	// Update/Save the event
	if (empty($existing)) {
	- $folder = $this->save_event($event, $status);
	+ $folderId = $this->save_event($event, $status);

	// Create SyncState for the new event, so it is not synced twice
	- if ($folder) {
	- $folderId = $this->getFolderId($folder);
	-
	+ if ($folderId) {
	try {
	$syncBackend = Syncroton_Registry::getSyncStateBackend();
	$folderBackend = Syncroton_Registry::getFolderBackend();
	@@ -711,7 +713,7 @@
	$contentBackend->create(new Syncroton_Model_Content(array(
	'device_id' => $this->device->id,
	'folder_id' => $syncFolder->id,
	- 'contentid' => $this->serverId($event['uid'], $folder),
	+ 'contentid' => $this->serverId($event['uid'], $folderId),
	'creation_time' => $syncState->lastsync,
	'creation_synckey' => $syncState->counter,
	)));
	@@ -722,10 +724,10 @@
	}
	}
	else {
	- $folder = $this->update_event($event, $existing, $status, $request->instanceId);
	+ $folderId = $this->update_event($event, $existing, $status, $request->instanceId);
	}

	- if (!$folder) {
	+ if (!$folderId) {
	throw new Syncroton_Exception_Status_MeetingResponse(Syncroton_Exception_Status_MeetingResponse::MEETING_ERROR);
	}

	@@ -740,7 +742,7 @@
	// as it's expected by the specification. Server
	// should delete an event in such a case, but we
	// keep the event copy with appropriate attendee status instead.
	- return empty($status) ? null : $this->serverId($event['uid'], $folder);
	+ return empty($status) ? null : $this->serverId($event['uid'], $folderId);
	}

	/**
	@@ -762,7 +764,7 @@
	}

	// Event from calendar folder
	- if ($event = $this->getObject($request->collectionId, $request->requestId, $folder)) {
	+ if ($event = $this->getObject($request->collectionId, $request->requestId)) {
	return array($event, $event);
	}

	@@ -783,12 +785,17 @@

	// TODO: should we check every existing event folder even if not subscribed for sync?

	- foreach ($this->listFolders() as $folder) {
	- $storage_folder = $this->getFolderObject($folder['imap_name']);
	- if ($storage_folder->get_namespace() == 'personal'
	- && ($result = $storage_folder->get_object($uid))
	- ) {
	- return $result;
	+ if ($folders = $this->listFolders()) {
	+ foreach ($folders as $_folder) {
	+ $folder = $this->backend->getFolder($_folder['serverId'], $this->device->deviceid, $this->modelName);
	+
	+ if ($folder
	+ && $folder->get_namespace() == 'personal'
	+ && ($result = $this->backend->getObject($_folder['serverId'], $this->device->deviceid, $this->modelName, $uid))
	+ ) {
	+ $result['folderId'] = $_folder['serverId'];
	+ return $result;
	+ }
	}
	}
	}
	@@ -809,7 +816,7 @@

	// Updating an existing event is most-likely a response
	// to an iTip request with bumped SEQUENCE
	- $old['sequence'] += 1;
	+ $old['sequence'] = ($old['sequence'] ?? 0) + 1;

	// Copy new custom properties
	if (!empty($event['x-custom'])) {
	@@ -828,25 +835,23 @@
	*/
	protected function save_event(&$event, $status = null)
	{
	- // Find default folder to which we'll save the event
	- if (!isset($event['_mailbox'])) {
	- $folders = $this->listFolders();
	- $storage = rcube::get_instance()->get_storage();
	-
	- // find the default
	- foreach ($folders as $folder) {
	- if ($folder['type'] == 8 && $storage->folder_namespace($folder['imap_name']) == 'personal') {
	- $event['_mailbox'] = $folder['imap_name'];
	- break;
	- }
	- }
	-
	- // if there's no folder marked as default, use any
	- if (!isset($event['_mailbox']) && !empty($folders)) {
	- foreach ($folders as $folder) {
	- if ($storage->folder_namespace($folder['imap_name']) == 'personal') {
	- $event['_mailbox'] = $folder['imap_name'];
	- break;
	+ $first = null;
	+ $default = null;
	+
	+ if (!isset($event['folderId'])) {
	+ // Find the folder to which we'll save the event
	+ if ($folders = $this->listFolders()) {
	+ foreach ($folders as $_folder) {
	+ $folder = $this->backend->getFolder($_folder['serverId'], $this->device->deviceid, $this->modelName);
	+
	+ if ($folder && $folder->get_namespace() == 'personal') {
	+ if ($_folder['type'] == 8) {
	+ $default = $_folder['serverId'];
	+ break;
	+ }
	+ if (!$first) {
	+ $first = $_folder['serverId'];
	+ }
	}
	}
	}
	@@ -861,12 +866,12 @@

	// TODO: Free/busy trigger?

	- if (isset($event['_mailbox'])) {
	- $folder = $this->getFolderObject($event['_mailbox']);
	+ $old_uid = isset($event['folderId']) ? $event['uid'] : null;
	+ $folder_id = $event['folderId'] ?? ($default ?? $first);
	+ $folder = $this->backend->getFolder($folder_id, $this->device->deviceid, $this->modelName);

	- if ($folder && $folder->valid && $folder->save($event)) {
	- return $folder;
	- }
	+ if (!empty($folder) && $folder->valid && $folder->save($event, $this->modelName, $old_uid)) {
	+ return $folder_id;
	}

	return false;
	diff --git a/lib/kolab_sync_data_email.php b/lib/kolab_sync_data_email.php
	--- a/lib/kolab_sync_data_email.php
	+++ b/lib/kolab_sync_data_email.php
	@@ -93,9 +93,6 @@
	*/
	protected $folderType = Syncroton_Command_FolderSync::FOLDERTYPE_MAIL_USER_CREATED;

	- private $lastsync_folder = null;
	- private $lastsync_time = null;
	-

	/**
	* the constructor
	@@ -470,7 +467,7 @@
	// Categories (Tags)
	if (isset($this->tag_categories) && $this->tag_categories) {
	// convert kolab tags into categories
	- $result['categories'] = $this->getKolabTags($message);
	+ $result['categories'] = $this->backend->getCategories($message);
	}

	$is_ios = preg_match('/(iphone\|ipad)/i', $this->device->devicetype);
	@@ -694,7 +691,7 @@
	$copyuid = isset($this->storage->conn->data['COPYUID']) ? $this->storage->conn->data['COPYUID'] : null;

	if (is_array($copyuid) && ($uid = $copyuid[1])) {
	- return $this->createMessageId($dest_id, $uid);
	+ return $this->serverId($uid, $dest_id);
	}
	}

	@@ -719,7 +716,7 @@
	throw new Syncroton_Exception_Status_Sync(Syncroton_Exception_Status_Sync::SYNC_SERVER_ERROR);
	}

	- return $this->createMessageId($folderId, $uid);
	+ return $this->serverId($uid, $folderId);
	}

	/**
	@@ -765,7 +762,7 @@

	// Categories (Tags) change
	if (isset($entry->categories)) {
	- $this->setKolabTags($message, $entry->categories);
	+ $this->backend->setCategories($message, $entry->categories);
	}
	}

	@@ -950,243 +947,6 @@
	}
	}

	- /**
	- * Search for existing entries
	- *
	- * @param string $folderid
	- * @param array $filter
	- * @param int $result_type Type of the result (see RESULT_* constants)
	- *
	- * @return array\|int Search result as count or array of uids/objects
	- */
	- protected function searchEntries($folderid, $filter = array(), $result_type = self::RESULT_UID)
	- {
	- $folders = $this->extractFolders($folderid);
	- $filter_str = 'ALL UNDELETED';
	-
	- // convert filter into one IMAP search string
	- foreach ($filter as $idx => $filter_item) {
	- if (is_array($filter_item)) {
	- // This is a request for changes since last time
	- // we'll use HIGHESTMODSEQ value from the last Sync
	- if ($filter_item[0] == 'changed' && $filter_item[1] == '>') {
	- $modseq_lasttime = $filter_item[2];
	- $modseq_data = array();
	- $modseq = (array) $this->backend->modseq_get($this->device->id, $folderid, $modseq_lasttime);
	- }
	- }
	- else {
	- $filter_str .= ' ' . $filter_item;
	- }
	- }
	-
	- // get members of modified relations
	- $changed_msgs = $this->getChangesByRelations($folderid, $filter);
	-
	- $result = $result_type == self::RESULT_COUNT ? 0 : array();
	- $found = 0;
	- $ts = time();
	-
	- foreach ($folders as $folder_id) {
	- $foldername = $this->backend->folder_id2name($folder_id, $this->device->deviceid);
	-
	- if ($foldername === null) {
	- continue;
	- }
	-
	- $found++;
	-
	- $this->storage->set_folder($foldername);
	-
	- // Synchronize folder (if it wasn't synced in this request already)
	- if ($this->lastsync_folder != $folderid
	- \|\| $this->lastsync_time <= $ts - Syncroton_Registry::getPingTimeout()
	- ) {
	- $this->storage->folder_sync($foldername);
	- }
	-
	- // We're in "get changes" mode
	- if (isset($modseq_data)) {
	- $folder_data = $this->storage->folder_data($foldername);
	- $modified = false;
	-
	- // If previous HIGHESTMODSEQ doesn't exist we can't get changes
	- // We can only get folder's HIGHESTMODSEQ value and store it for the next try
	- // Skip search if HIGHESTMODSEQ didn't change
	- if (!empty($folder_data['HIGHESTMODSEQ'])) {
	- $modseq_data[$foldername] = $folder_data['HIGHESTMODSEQ'];
	- $modseq_old = isset($modseq[$foldername]) ? $modseq[$foldername] : null;
	- if ($modseq_data[$foldername] != $modseq_old) {
	- $modseq_update = true;
	- if ($modseq && $modseq_old) {
	- $modified = true;
	- $filter_str .= " MODSEQ " . ($modseq_old + 1);
	- }
	- }
	- }
	- }
	- else {
	- $modified = true;
	- }
	-
	- // We could use messages cache by replacing search() with index()
	- // in some cases. This however is possible only if user has skip_deleted=true,
	- // in his Roundcube preferences, otherwise we'd make often cache re-initialization,
	- // because Roundcube message cache can work only with one skip_deleted
	- // setting at a time. We'd also need to make sure folder_sync() was called
	- // before (see above).
	- //
	- // if ($filter_str == 'ALL UNDELETED')
	- // $search = $this->storage->index($foldername, null, null, true, true);
	- // else
	-
	- if ($modified) {
	- $search = $this->storage->search_once($foldername, $filter_str);
	-
	- if (!($search instanceof rcube_result_index) \|\| $search->is_error()) {
	- throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	- }
	-
	- switch ($result_type) {
	- case self::RESULT_COUNT:
	- $result += (int) $search->count();
	- break;
	-
	- case self::RESULT_UID:
	- if ($uids = $search->get()) {
	- foreach ($uids as $idx => $uid) {
	- $uids[$idx] = $this->createMessageId($folder_id, $uid);
	- }
	- $result = array_merge($result, $uids);
	- }
	- break;
	- }
	- }
	-
	- // handle relation changes
	- if (!empty($changed_msgs)) {
	- $uids = $this->findRelationMembersInFolder($foldername, $changed_msgs, $filter);
	-
	- switch ($result_type) {
	- case self::RESULT_COUNT:
	- $result += (int) count($uids);
	- break;
	-
	- case self::RESULT_UID:
	- foreach ($uids as $idx => $uid) {
	- $uids[$idx] = $this->createMessageId($folder_id, $uid);
	- }
	- $result = array_unique(array_merge($result, $uids));
	- break;
	- }
	- }
	- }
	-
	- if (!$found) {
	- throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	- }
	-
	- $this->lastsync_folder = $folderid;
	- $this->lastsync_time = $ts;
	-
	- if (!empty($modseq_update)) {
	- $this->backend->modseq_set($this->device->id, $folderid,
	- $this->syncTimeStamp, $modseq_data);
	-
	- // if previous modseq information does not exist save current set as it,
	- // we would at least be able to detect changes since now
	- if (empty($result) && empty($modseq)) {
	- $this->backend->modseq_set($this->device->id, $folderid,
	- $modseq_lasttime, $modseq_data);
	- }
	- }
	-
	- return $result;
	- }
	-
	- /**
	- * Find members (messages) in specified folder
	- */
	- protected function findRelationMembersInFolder($foldername, $members, $filter)
	- {
	- foreach ($members as $member) {
	- // IMAP URI members
	- if ($url = kolab_storage_config::parse_member_url($member)) {
	- $result[$url['folder']][$url['uid']] = $url['params'];
	- }
	- }
	-
	- // convert filter into one IMAP search string
	- $filter_str = 'ALL UNDELETED';
	- foreach ($filter as $filter_item) {
	- if (is_string($filter_item)) {
	- $filter_str .= ' ' . $filter_item;
	- }
	- }
	-
	- $rcube = rcube::get_instance();
	- $storage = $rcube->get_storage();
	- $found = array();
	-
	- // first find messages by UID
	- if (!empty($result[$foldername])) {
	- $index = $storage->search_once($foldername, 'UID '
	- . rcube_imap_generic::compressMessageSet(array_keys($result[$foldername])));
	- $found = $index->get();
	-
	- // remove found messages from the $result
	- if (!empty($found)) {
	- $result[$foldername] = array_diff_key($result[$foldername], array_flip($found));
	-
	- if (empty($result[$foldername])) {
	- unset($result[$foldername]);
	- }
	-
	- // now apply the current filter to the found messages
	- $index = $storage->search_once($foldername, $filter_str . ' UID '
	- . rcube_imap_generic::compressMessageSet($found));
	- $found = $index->get();
	- }
	- }
	-
	- // search by message parameters
	- if (!empty($result)) {
	- // @TODO: do this search in chunks (for e.g. 25 messages)?
	- $search = '';
	- $search_count = 0;
	-
	- foreach ($result as $data) {
	- foreach ($data as $p) {
	- $search_params = array();
	- $search_count++;
	-
	- foreach ($p as $key => $val) {
	- $key = strtoupper($key);
	- // don't search by subject, we don't want false-positives
	- if ($key != 'SUBJECT') {
	- $search_params[] = 'HEADER ' . $key . ' ' . rcube_imap_generic::escape($val);
	- }
	- }
	-
	- $search .= ' (' . implode(' ', $search_params) . ')';
	- }
	- }
	-
	- $search_str = str_repeat(' OR', $search_count-1) . $search;
	-
	- // search messages in current folder
	- $search = $storage->search_once($foldername, $search_str);
	- $uids = $search->get();
	-
	- if (!empty($uids)) {
	- // add UIDs into the result
	- $found = array_unique(array_merge($found, $uids));
	- }
	- }
	-
	- return $found;
	- }
	-
	/**
	* ActiveSync Search handler
	*
	@@ -1229,7 +989,7 @@
	$uids = $search->get();
	foreach ($uids as $idx => $uid) {
	$uids[$idx] = new Syncroton_Model_StoreResponseResult(array(
	- 'longId' => $this->createMessageId($folderid, $uid),
	+ 'longId' => $this->serverId($uid, $folderid),
	'collectionId' => $folderid,
	'class' => 'Email',
	));
	@@ -1347,7 +1107,7 @@
	/**
	* Fetches the entry from the backend
	*/
	- protected function getObject($entryid, $dummy = null, &$folder = null)
	+ protected function getObject($entryid, $dummy = null)
	{
	$message = $this->parseMessageId($entryid);

	@@ -1417,7 +1177,7 @@
	/**
	* Creates entry ID of the message
	*/
	- public function createMessageId($folderid, $uid)
	+ protected function serverId($uid, $folderid)
	{
	return $folderid . '::' . $uid;
	}
	@@ -1543,106 +1303,6 @@
	return mb_strcut(trim($body), 0, $size);
	}

	- /**
	- * Returns list of tag names assigned to an email message
	- */
	- protected function getKolabTags($message, $dummy = null)
	- {
	- // support only messages with message-id
	- if (!($msg_id = $message->headers->get('message-id', false))) {
	- return null;
	- }
	-
	- $config = kolab_storage_config::get_instance();
	- $delta = Syncroton_Registry::getPingTimeout();
	- $folder = $message->folder;
	- $uid = $message->uid;
	-
	- // get tag objects raleted to specified message-id
	- $tags = $config->get_tags($msg_id);
	-
	- foreach ($tags as $idx => $tag) {
	- // resolve members if it wasn't done recently
	- $force = empty($this->tag_rts[$tag['uid']]) \|\| $this->tag_rts[$tag['uid']] <= time() - $delta;
	- $members = $config->resolve_members($tag, $force);
	-
	- if (empty($members[$folder]) \|\| !in_array($uid, $members[$folder])) {
	- unset($tags[$idx]);
	- }
	-
	- if ($force) {
	- $this->tag_rts[$tag['uid']] = time();
	- }
	- }
	-
	- $tags = array_filter(array_map(function($v) { return $v['name']; }, $tags));
	-
	- // make sure current folder is set correctly again
	- $this->storage->set_folder($folder);
	-
	- return !empty($tags) ? $tags : null;
	- }
	-
	- /**
	- * Set tags to an email message
	- */
	- protected function setKolabTags($message, $tags)
	- {
	- $config = kolab_storage_config::get_instance();
	- $delta = Syncroton_Registry::getPingTimeout();
	- $folder = $message->folder;
	- $uri = kolab_storage_config::get_message_uri($message->headers, $folder);
	-
	- // for all tag objects...
	- foreach ($config->get_tags() as $relation) {
	- // resolve members if it wasn't done recently
	- $uid = $relation['uid'];
	- $force = empty($this->tag_rts[$uid]) \|\| $this->tag_rts[$uid] <= time() - $delta;
	-
	- if ($force) {
	- $config->resolve_members($relation, $force);
	- $this->tag_rts[$relation['uid']] = time();
	- }
	-
	- $selected = !empty($tags) && in_array($relation['name'], $tags);
	- $found = !empty($relation['members']) && in_array($uri, $relation['members']);
	- $update = false;
	-
	- // remove member from the relation
	- if ($found && !$selected) {
	- $relation['members'] = array_diff($relation['members'], (array) $uri);
	- $update = true;
	- }
	- // add member to the relation
	- else if (!$found && $selected) {
	- $relation['members'][] = $uri;
	- $update = true;
	- }
	-
	- if ($update) {
	- $config->save($relation, 'relation');
	- }
	-
	- $tags = array_diff($tags, (array) $relation['name']);
	- }
	-
	- // create new relations
	- if (!empty($tags)) {
	- foreach ($tags as $tag) {
	- $relation = array(
	- 'name' => $tag,
	- 'members' => (array) $uri,
	- 'category' => 'tag',
	- );
	-
	- $config->save($relation, 'relation');
	- }
	- }
	-
	- // make sure current folder is set correctly again
	- $this->storage->set_folder($folder);
	- }
	-
	public static function charset_to_cp($charset)
	{
	// @TODO: ?????
	diff --git a/lib/kolab_sync_data_notes.php b/lib/kolab_sync_data_notes.php
	--- a/lib/kolab_sync_data_notes.php
	+++ b/lib/kolab_sync_data_notes.php
	@@ -85,7 +85,6 @@
	public function getEntry(Syncroton_Model_SyncCollection $collection, $serverId, $as_array = false)
	{
	$note = is_array($serverId) ? $serverId : $this->getObject($collection->collectionId, $serverId);
	-// $config = $this->getFolderConfig($note['_mailbox']);
	$result = array();

	// Calendar namespace fields
	@@ -112,7 +111,7 @@
	$result['messageClass'] = 'IPM.StickyNote';

	// convert kolab tags into categories
	- $result['categories'] = $this->getKolabTags($note['uid'], $result['categories']);
	+ $result['categories'] = $this->backend->getCategories($note['uid'], $result['categories']);

	return $as_array ? $result : new Syncroton_Model_Note($result);
	}
	@@ -128,9 +127,7 @@
	*/
	public function toKolab(Syncroton_Model_IEntry $data, $folderid, $entry = null)
	{
	- $note = !empty($entry) ? $entry : array();
	- $foldername = isset($note['_mailbox']) ? $note['_mailbox'] : $this->getFolderName($folderid);
	-// $config = $this->getFolderConfig($foldername);
	+ $note = !empty($entry) ? $entry : array();

	// Calendar namespace fields
	foreach ($this->mapping as $key => $name) {
	diff --git a/lib/kolab_sync_data_tasks.php b/lib/kolab_sync_data_tasks.php
	--- a/lib/kolab_sync_data_tasks.php
	+++ b/lib/kolab_sync_data_tasks.php
	@@ -113,7 +113,6 @@
	public function getEntry(Syncroton_Model_SyncCollection $collection, $serverId, $as_array = false)
	{
	$task = is_array($serverId) ? $serverId : $this->getObject($collection->collectionId, $serverId);
	-// $config = $this->getFolderConfig($task['_mailbox']);
	$result = array();

	// Completion status (required)
	@@ -159,7 +158,7 @@

	// convert kolab tags into categories
	if (!empty($result['categories'])) {
	- $result['categories'] = $this->getKolabTags($task['uid'], $result['categories']);
	+ $result['categories'] = $this->backend->getCategories($task['uid'], $result['categories']);
	}

	// Recurrence
	@@ -168,8 +167,6 @@
	return $as_array ? $result : new Syncroton_Model_Task($result);
	}

	-
	-
	/**
	* Apply a timezone matching the utc offset.
	*/
	@@ -196,9 +193,7 @@
	*/
	public function toKolab(Syncroton_Model_IEntry $data, $folderid, $entry = null)
	{
	- $task = !empty($entry) ? $entry : array();
	- $foldername = isset($task['_mailbox']) ? $task['_mailbox'] : $this->getFolderName($folderid);
	-// $config = $this->getFolderConfig($foldername);
	+ $task = !empty($entry) ? $entry : array();

	$task['allday'] = 0;

	diff --git a/lib/kolab_sync_storage.php b/lib/kolab_sync_storage.php
	new file mode 100644
	--- /dev/null
	+++ b/lib/kolab_sync_storage.php
	@@ -0,0 +1,1827 @@
	+<?php
	+
	+/**
	+ +--------------------------------------------------------------------------+
	+ \| Kolab Sync (ActiveSync for Kolab) \|
	+ \| \|
	+ \| Copyright (C) 2011-2012, 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/> \|
	+ +--------------------------------------------------------------------------+
	+ \| Author: Aleksander Machniak <machniak@kolabsys.com> \|
	+ +--------------------------------------------------------------------------+
	+*/
	+
	+/**
	+ * Storage handling class with basic Kolab support (everything stored in IMAP)
	+ */
	+class kolab_sync_storage
	+{
	+ const INIT_SUB_PERSONAL = 1; // all subscribed folders in personal namespace
	+ const INIT_ALL_PERSONAL = 2; // all folders in personal namespace
	+ const INIT_SUB_OTHER = 4; // all subscribed folders in other users namespace
	+ const INIT_ALL_OTHER = 8; // all folders in other users namespace
	+ const INIT_SUB_SHARED = 16; // all subscribed folders in shared namespace
	+ const INIT_ALL_SHARED = 32; // all folders in shared namespace
	+
	+ const MODEL_CALENDAR = 'event';
	+ const MODEL_CONTACTS = 'contact';
	+ const MODEL_EMAIL = 'mail';
	+ const MODEL_NOTES = 'note';
	+ const MODEL_TASKS = 'task';
	+
	+ const ROOT_MAILBOX = 'INBOX';
	+ const ASYNC_KEY = '/private/vendor/kolab/activesync';
	+ const UID_KEY = '/shared/vendor/cmu/cyrus-imapd/uniqueid';
	+
	+ const CTYPE_KEY = '/shared/vendor/kolab/folder-type';
	+ const CTYPE_KEY_PRIVATE = '/private/vendor/kolab/folder-type';
	+
	+ public $syncTimeStamp;
	+
	+ protected $storage;
	+ protected $folder_meta;
	+ protected $folder_uids;
	+ protected $folders = [];
	+ protected $root_meta;
	+ protected $relationSupport = true;
	+ protected $tag_rts = [];
	+
	+ protected static $instance;
	+
	+ protected static $types = [
	+ 1 => '',
	+ 2 => 'mail.inbox',
	+ 3 => 'mail.drafts',
	+ 4 => 'mail.wastebasket',
	+ 5 => 'mail.sentitems',
	+ 6 => 'mail.outbox',
	+ 7 => 'task.default',
	+ 8 => 'event.default',
	+ 9 => 'contact.default',
	+ 10 => 'note.default',
	+ 11 => 'journal.default',
	+ 12 => 'mail',
	+ 13 => 'event',
	+ 14 => 'contact',
	+ 15 => 'task',
	+ 16 => 'journal',
	+ 17 => 'note',
	+ ];
	+
	+ protected static $classes = [
	+ Syncroton_Data_Factory::CLASS_CALENDAR => self::MODEL_CALENDAR,
	+ Syncroton_Data_Factory::CLASS_CONTACTS => self::MODEL_CONTACTS,
	+ Syncroton_Data_Factory::CLASS_EMAIL => self::MODEL_EMAIL,
	+ Syncroton_Data_Factory::CLASS_NOTES => self::MODEL_NOTES,
	+ Syncroton_Data_Factory::CLASS_TASKS => self::MODEL_TASKS,
	+ ];
	+
	+
	+ /**
	+ * This implements the 'singleton' design pattern
	+ *
	+ * @return kolab_sync_storage The one and only instance
	+ */
	+ public static function get_instance()
	+ {
	+ if (!self::$instance) {
	+ self::$instance = new kolab_sync_storage;
	+ self::$instance->startup(); // init AFTER object was linked with self::$instance
	+ }
	+
	+ return self::$instance;
	+ }
	+
	+
	+ /**
	+ * Class initialization
	+ */
	+ public function startup()
	+ {
	+ $this->storage = kolab_sync::get_instance()->get_storage();
	+
	+ // @TODO: reset cache? if we do this for every request the cache would be useless
	+ // There's no session here
	+ //$this->storage->clear_cache('mailboxes.', true);
	+
	+ // set additional header used by libkolab
	+ $this->storage->set_options([
	+ // @TODO: there can be Roundcube plugins defining additional headers,
	+ // we maybe would need to add them here
	+ 'fetch_headers' => 'X-KOLAB-TYPE X-KOLAB-MIME-VERSION',
	+ 'skip_deleted' => true,
	+ 'threading' => false,
	+ ]);
	+
	+ // Disable paging
	+ $this->storage->set_pagesize(999999);
	+ }
	+
	+ /**
	+ * Clear internal cache state
	+ */
	+ public function reset()
	+ {
	+ $this->folders = [];
	+ }
	+
	+ /**
	+ * List known devices
	+ *
	+ * @return array Device list as hash array
	+ */
	+ public function devices_list()
	+ {
	+ if ($this->root_meta === null) {
	+ // @TODO: consider server annotation instead of INBOX
	+ if ($meta = $this->storage->get_metadata(self::ROOT_MAILBOX, self::ASYNC_KEY)) {
	+ $this->root_meta = $this->unserialize_metadata($meta[self::ROOT_MAILBOX][self::ASYNC_KEY]);
	+ }
	+ else {
	+ $this->root_meta = [];
	+ }
	+ }
	+
	+ if (!empty($this->root_meta['DEVICE']) && is_array($this->root_meta['DEVICE'])) {
	+ return $this->root_meta['DEVICE'];
	+ }
	+
	+ return [];
	+ }
	+
	+
	+ /**
	+ * Get list of folders available for sync
	+ *
	+ * @param string $deviceid Device identifier
	+ * @param string $type Folder type
	+ * @param bool $flat_mode Enables flat-list mode
	+ *
	+ * @return array\|bool List of mailbox folders, False on backend failure
	+ */
	+ public function folders_list($deviceid, $type, $flat_mode = false)
	+ {
	+ // get all folders of specified type
	+ $folders = kolab_storage::list_folders('', '*', $type, false, $typedata);
	+
	+ // get folders activesync config
	+ $folderdata = $this->folder_meta();
	+
	+ if (!is_array($folders) \|\| !is_array($folderdata)) {
	+ return false;
	+ }
	+
	+ $folders_list = [];
	+
	+ // check if folders are "subscribed" for activesync
	+ foreach ($folderdata as $folder => $meta) {
	+ if (empty($meta['FOLDER']) \|\| empty($meta['FOLDER'][$deviceid])
	+ \|\| empty($meta['FOLDER'][$deviceid]['S'])
	+ ) {
	+ continue;
	+ }
	+
	+ // force numeric folder name to be a string (T1283)
	+ $folder = (string) $folder;
	+
	+ if (!empty($type) && !in_array($folder, $folders)) {
	+ continue;
	+ }
	+
	+ // Activesync folder identifier (serverId)
	+ $folder_type = !empty($typedata[$folder]) ? $typedata[$folder] : 'mail';
	+ $folder_id = $this->folder_id($folder, $folder_type);
	+
	+ $folders_list[$folder_id] = $this->folder_data($folder, $folder_type);
	+ }
	+
	+ if ($flat_mode) {
	+ $folders_list = $this->folders_list_flat($folders_list, $type, $typedata);
	+ }
	+
	+ return $folders_list;
	+ }
	+
	+
	+ /**
	+ * Converts list of folders to a "flat" list
	+ */
	+ protected function folders_list_flat($folders, $type, $typedata)
	+ {
	+ $delim = $this->storage->get_hierarchy_delimiter();
	+
	+ foreach ($folders as $idx => $folder) {
	+ if ($folder['parentId']) {
	+ // for non-mail folders we make the list completely flat
	+ if ($type != self::MODEL_EMAIL) {
	+ $display_name = kolab_storage::object_name($folder['imap_name']);
	+ $display_name = html_entity_decode($display_name, ENT_COMPAT, RCUBE_CHARSET);
	+
	+ $folders[$idx]['parentId'] = 0;
	+ $folders[$idx]['displayName'] = $display_name;
	+ }
	+ // for mail folders we modify only folders with non-existing parents
	+ else if (!isset($folders[$folder['parentId']])) {
	+ $items = explode($delim, $folder['imap_name']);
	+ $parent = 0;
	+
	+ // find existing parent
	+ while (count($items) > 0) {
	+ array_pop($items);
	+
	+ $parent_name = implode($delim, $items);
	+ $parent_type = !empty($typedata[$parent_name]) ? $typedata[$parent_name] : 'mail';
	+ $parent_id = $this->folder_id($parent_name, $parent_type);
	+
	+ if (isset($folders[$parent_id])) {
	+ $parent = $parent_id;
	+ break;
	+ }
	+ }
	+
	+ if (!$parent) {
	+ $display_name = kolab_storage::object_name($folder['imap_name']);
	+ $display_name = html_entity_decode($display_name, ENT_COMPAT, RCUBE_CHARSET);
	+ }
	+ else {
	+ $parent_name = $folders[$parent_id]['imap_name'];
	+ $display_name = substr($folder['imap_name'], strlen($parent_name)+1);
	+ $display_name = rcube_charset::convert($display_name, 'UTF7-IMAP');
	+ $display_name = str_replace($delim, ' » ', $display_name);
	+ }
	+
	+ $folders[$idx]['parentId'] = $parent;
	+ $folders[$idx]['displayName'] = $display_name;
	+ }
	+ }
	+ }
	+
	+ return $folders;
	+ }
	+
	+
	+ /**
	+ * Getter for folder metadata
	+ *
	+ * @return array\|bool Hash array with meta data for each folder, False on backend failure
	+ */
	+ public function folder_meta()
	+ {
	+ if (!isset($this->folder_meta)) {
	+ // get folders activesync config
	+ $folderdata = $this->storage->get_metadata("*", self::ASYNC_KEY);
	+
	+ if (!is_array($folderdata)) {
	+ return $this->folder_meta = false;
	+ }
	+
	+ $this->folder_meta = [];
	+
	+ foreach ($folderdata as $folder => $meta) {
	+ if ($asyncdata = $meta[self::ASYNC_KEY]) {
	+ if ($metadata = $this->unserialize_metadata($asyncdata)) {
	+ $this->folder_meta[$folder] = $metadata;
	+ }
	+ }
	+ }
	+ }
	+
	+ return $this->folder_meta;
	+ }
	+
	+
	+ /**
	+ * Creates folder and subscribes to the device
	+ *
	+ * @param string $name Folder name (UTF8)
	+ * @param int $type Folder (ActiveSync) type
	+ * @param string $deviceid Device identifier
	+ * @param ?string $parentid Parent folder id identifier
	+ *
	+ * @return string\|false New folder identifier on success, False on failure
	+ */
	+ public function folder_create($name, $type, $deviceid, $parentid = null)
	+ {
	+ $parent = null;
	+ $name = rcube_charset::convert($name, kolab_sync::CHARSET, 'UTF7-IMAP');
	+
	+ if ($parentid) {
	+ $parent = $this->folder_id2name($parentid, $deviceid);
	+
	+ if ($parent === null) {
	+ throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::PARENT_NOT_FOUND);
	+ }
	+ }
	+
	+ if ($parent !== null) {
	+ $delim = $this->storage->get_hierarchy_delimiter();
	+ $name = $parent . $delim . $name;
	+ }
	+
	+ if ($this->storage->folder_exists($name)) {
	+ throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::FOLDER_EXISTS);
	+ }
	+
	+ $type = self::type_activesync2kolab($type);
	+ $created = kolab_storage::folder_create($name, $type, true);
	+
	+ if ($created) {
	+ // Set ActiveSync subscription flag
	+ $this->folder_set($name, $deviceid, 1);
	+
	+ return $this->folder_id($name, $type);
	+ }
	+
	+ // Special case when client tries to create a subfolder of INBOX
	+ // which is not possible on Cyrus-IMAP (T2223)
	+ if ($parent === 'INBOX' && stripos($this->last_error(), 'invalid') !== false) {
	+ throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::SPECIAL_FOLDER);
	+ }
	+
	+ return false;
	+ }
	+
	+
	+ /**
	+ * Renames a folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $new_name New folder name (UTF8)
	+ * @param ?string $parentid Folder parent identifier
	+ *
	+ * @return bool True on success, False on failure
	+ */
	+ public function folder_rename($folderid, $deviceid, $new_name, $parentid)
	+ {
	+ $old_name = $this->folder_id2name($folderid, $deviceid);
	+
	+ if ($parentid) {
	+ $parent = $this->folder_id2name($parentid, $deviceid);
	+ }
	+
	+ $name = rcube_charset::convert($new_name, kolab_sync::CHARSET, 'UTF7-IMAP');
	+
	+ if (isset($parent)) {
	+ $delim = $this->storage->get_hierarchy_delimiter();
	+ $name = $parent . $delim . $name;
	+ }
	+
	+ // Rename/move IMAP folder
	+ if ($name === $old_name) {
	+ return true;
	+ }
	+
	+ $this->folder_meta = null;
	+
	+ // TODO: folder type change?
	+
	+ $type = kolab_storage::folder_type($old_name);
	+
	+ // don't use kolab_storage for moving mail folders
	+ if (preg_match('/^mail/', $type)) {
	+ return $this->storage->rename_folder($old_name, $name);
	+ }
	+ else {
	+ return kolab_storage::folder_rename($old_name, $name);
	+ }
	+ }
	+
	+ /**
	+ * Deletes folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ *
	+ * @param bool True on success, False otherwise
	+ */
	+ public function folder_delete($folderid, $deviceid)
	+ {
	+ $name = $this->folder_id2name($folderid, $deviceid);
	+ $type = kolab_storage::folder_type($name);
	+
	+ unset($this->folder_meta[$name]);
	+
	+ // don't use kolab_storage for deleting mail folders
	+ if (preg_match('/^mail/', $type)) {
	+ return $this->storage->delete_folder($name);
	+ }
	+
	+ return kolab_storage::folder_delete($name);
	+ }
	+
	+ /**
	+ * Deletes contents of a folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param bool $recursive Apply to the folder and its subfolders
	+ *
	+ * @param bool True on success, False otherwise
	+ */
	+ public function folder_empty($folderid, $deviceid, $recursive = false)
	+ {
	+ $foldername = $this->folder_id2name($folderid, $deviceid);
	+
	+ // Remove all entries
	+ if (!$this->storage->clear_folder($foldername)) {
	+ return false;
	+ }
	+
	+ // Remove subfolders
	+ if ($recursive) {
	+ $delim = $this->storage->get_hierarchy_delimiter();
	+ $folderdata = $this->folder_meta();
	+
	+ if (!is_array($folderdata)) {
	+ return false;
	+ }
	+
	+ foreach ($folderdata as $subfolder => $meta) {
	+ if (!empty($meta['FOLDER'][$deviceid]['S']) && strpos((string) $subfolder, $foldername . $delim)) {
	+ if (!$this->storage->clear_folder((string) $subfolder)) {
	+ return false;
	+ }
	+ }
	+ }
	+ }
	+
	+ return true;
	+ }
	+
	+ /**
	+ * Sets ActiveSync subscription flag on a folder
	+ *
	+ * @param string $name Folder name (UTF7-IMAP)
	+ * @param string $deviceid Device identifier
	+ * @param int $flag Flag value (0\|1\|2)
	+ */
	+ public function folder_set($name, $deviceid, $flag)
	+ {
	+ if (empty($deviceid)) {
	+ return false;
	+ }
	+
	+ // get folders activesync config
	+ $metadata = $this->folder_meta();
	+
	+ if (!is_array($metadata)) {
	+ return false;
	+ }
	+
	+ $metadata = isset($metadata[$name]) ? $metadata[$name] : [];
	+
	+ if ($flag) {
	+ if (empty($metadata)) {
	+ $metadata = [];
	+ }
	+
	+ if (empty($metadata['FOLDER'])) {
	+ $metadata['FOLDER'] = [];
	+ }
	+
	+ if (empty($metadata['FOLDER'][$deviceid])) {
	+ $metadata['FOLDER'][$deviceid] = [];
	+ }
	+
	+ // Z-Push uses:
	+ // 1 - synchronize, no alarms
	+ // 2 - synchronize with alarms
	+ $metadata['FOLDER'][$deviceid]['S'] = $flag;
	+ }
	+ else {
	+ unset($metadata['FOLDER'][$deviceid]['S']);
	+
	+ if (empty($metadata['FOLDER'][$deviceid])) {
	+ unset($metadata['FOLDER'][$deviceid]);
	+ }
	+
	+ if (empty($metadata['FOLDER'])) {
	+ unset($metadata['FOLDER']);
	+ }
	+
	+ if (empty($metadata)) {
	+ $metadata = null;
	+ }
	+ }
	+
	+ // Return if nothing's been changed
	+ if (!self::data_array_diff(isset($this->folder_meta[$name]) ? $this->folder_meta[$name] : null, $metadata)) {
	+ return true;
	+ }
	+
	+ $this->folder_meta[$name] = $metadata;
	+
	+ return $this->storage->set_metadata($name, [self::ASYNC_KEY => $this->serialize_metadata($metadata)]);
	+ }
	+
	+
	+ public function device_get($id)
	+ {
	+ $devices_list = $this->devices_list();
	+ return $devices_list[$id] ?? null;
	+ }
	+
	+ /**
	+ * Registers new device on server
	+ *
	+ * @param array $device Device data
	+ * @param string $id Device ID
	+ *
	+ * @return bool True on success, False on failure
	+ */
	+ public function device_create($device, $id)
	+ {
	+ // Fill local cache
	+ $this->devices_list();
	+
	+ // Some devices create dummy devices with name "validate" (#1109)
	+ // This device entry is used in two initial requests, but later
	+ // the device registers a real name. We can remove this dummy entry
	+ // on new device creation
	+ $this->device_delete('validate');
	+
	+ // Old Kolab_ZPush device parameters
	+ // MODE: -1 \| 0 \| 1 (not set \| flatmode \| foldermode)
	+ // TYPE: device type string
	+ // ALIAS: user-friendly device name
	+
	+ // Syncroton (kolab_sync_backend_device) uses
	+ // ID: internal identifier in syncroton database
	+ // TYPE: device type string
	+ // ALIAS: user-friendly device name
	+
	+ $metadata = $this->root_meta;
	+ $metadata['DEVICE'][$id] = $device;
	+ $metadata = [self::ASYNC_KEY => $this->serialize_metadata($metadata)];
	+
	+ $result = $this->storage->set_metadata(self::ROOT_MAILBOX, $metadata);
	+
	+ if ($result) {
	+ // Update local cache
	+ $this->root_meta['DEVICE'][$id] = $device;
	+
	+ // subscribe default set of folders
	+ $this->device_init_subscriptions($id);
	+ }
	+
	+ return $result;
	+ }
	+
	+ /**
	+ * Device update.
	+ *
	+ * @param array $device Device data
	+ * @param string $id Device ID
	+ *
	+ * @return bool True on success, False on failure
	+ */
	+ public function device_update($device, $id)
	+ {
	+ $devices_list = $this->devices_list();
	+ $old_device = $devices_list[$id];
	+
	+ if (!$old_device) {
	+ return false;
	+ }
	+
	+ // Do nothing if nothing is changed
	+ if (!self::data_array_diff($old_device, $device)) {
	+ return true;
	+ }
	+
	+ $device = array_merge($old_device, $device);
	+
	+ $metadata = $this->root_meta;
	+ $metadata['DEVICE'][$id] = $device;
	+ $metadata = [self::ASYNC_KEY => $this->serialize_metadata($metadata)];
	+
	+ $result = $this->storage->set_metadata(self::ROOT_MAILBOX, $metadata);
	+
	+ if ($result) {
	+ // Update local cache
	+ $this->root_meta['DEVICE'][$id] = $device;
	+ }
	+
	+ return $result;
	+ }
	+
	+
	+ /**
	+ * Device delete.
	+ *
	+ * @param string $id Device ID
	+ *
	+ * @return bool True on success, False on failure
	+ */
	+ public function device_delete($id)
	+ {
	+ $device = $this->device_get($id);
	+
	+ if (!$device) {
	+ return false;
	+ }
	+
	+ unset($this->root_meta['DEVICE'][$id], $this->root_meta['FOLDER'][$id]);
	+
	+ if (empty($this->root_meta['DEVICE'])) {
	+ unset($this->root_meta['DEVICE']);
	+ }
	+ if (empty($this->root_meta['FOLDER'])) {
	+ unset($this->root_meta['FOLDER']);
	+ }
	+
	+ $metadata = $this->serialize_metadata($this->root_meta);
	+ $metadata = [self::ASYNC_KEY => $metadata];
	+
	+ // update meta data
	+ $result = $this->storage->set_metadata(self::ROOT_MAILBOX, $metadata);
	+
	+ if ($result) {
	+ // remove device annotation for every folder
	+ foreach ($this->folder_meta() as $folder => $meta) {
	+ // skip root folder (already handled above)
	+ if ($folder == self::ROOT_MAILBOX)
	+ continue;
	+
	+ if (!empty($meta['FOLDER']) && isset($meta['FOLDER'][$id])) {
	+ unset($meta['FOLDER'][$id]);
	+
	+ if (empty($meta['FOLDER'])) {
	+ unset($this->folder_meta[$folder]['FOLDER']);
	+ unset($meta['FOLDER']);
	+ }
	+ if (empty($meta)) {
	+ unset($this->folder_meta[$folder]);
	+ $meta = null;
	+ }
	+
	+ $metadata = [self::ASYNC_KEY => $this->serialize_metadata($meta)];
	+ $res = $this->storage->set_metadata($folder, $metadata);
	+
	+ if ($res && $meta) {
	+ $this->folder_meta[$folder] = $meta;
	+ }
	+ }
	+ }
	+ }
	+
	+ return $result;
	+ }
	+
	+ /**
	+ * Returns list of categories assigned to an object
	+ *
	+ * @param object\|string $object UID or rcube_message object
	+ * @param array $categories Addition tag names to merge with
	+ *
	+ * @return array List of categories
	+ */
	+ public function getCategories($object, $categories = [])
	+ {
	+ if (is_object($object)) {
	+ // support only messages with message-id
	+ if (!($msg_id = $object->headers->get('message-id', false))) {
	+ return [];
	+ }
	+
	+ $config = kolab_storage_config::get_instance();
	+ $delta = Syncroton_Registry::getPingTimeout();
	+ $folder = $object->folder;
	+ $uid = $object->uid;
	+
	+ // get tag objects raleted to specified message-id
	+ $tags = $config->get_tags($msg_id);
	+
	+ foreach ($tags as $idx => $tag) {
	+ // resolve members if it wasn't done recently
	+ $force = empty($this->tag_rts[$tag['uid']]) \|\| $this->tag_rts[$tag['uid']] <= time() - $delta;
	+ $members = $config->resolve_members($tag, $force);
	+
	+ if (empty($members[$folder]) \|\| !in_array($uid, $members[$folder])) {
	+ unset($tags[$idx]);
	+ }
	+
	+ if ($force) {
	+ $this->tag_rts[$tag['uid']] = time();
	+ }
	+ }
	+
	+ // make sure current folder is set correctly again
	+ $this->storage->set_folder($folder);
	+ } else {
	+ $config = kolab_storage_config::get_instance();
	+ $tags = $config->get_tags($object);
	+ }
	+
	+ $tags = array_filter(array_map(function($v) { return $v['name']; }, $tags));
	+
	+ // merge result with old categories
	+ if (!empty($categories)) {
	+ $tags = array_unique(array_merge($tags, (array) $categories));
	+ }
	+
	+ return $tags;
	+ }
	+
	+ /**
	+ * Gets kolab_storage_folder object from Activesync folder ID.
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ *
	+ * @param ?kolab_storage_folder
	+ */
	+ public function getFolder($folderid, $deviceid, $type)
	+ {
	+ $unique_key = "$folderid:$deviceid:$type";
	+
	+ if (array_key_exists($unique_key, $this->folders)) {
	+ return $this->folders[$unique_key];
	+ }
	+
	+ $foldername = $this->folder_id2name($folderid, $deviceid);
	+
	+ return $this->folders[$unique_key] = kolab_storage::get_folder($foldername, $type);
	+ }
	+
	+ /**
	+ * Gets Activesync preferences for a folder.
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ *
	+ * @param array
	+ */
	+ public function getFolderConfig($folderid, $deviceid, $type)
	+ {
	+ $foldername = $this->folder_id2name($folderid, $deviceid);
	+
	+ $metadata = $this->backend->folder_meta();
	+ $config = [];
	+
	+ if (!empty($metadata[$foldername]['FOLDER'][$deviceid])) {
	+ $config = $metadata[$foldername]['FOLDER'][$deviceid];
	+ }
	+
	+ return [
	+ 'ALARMS' => ($config['S'] ?? 0) == 2,
	+ ];
	+ }
	+
	+ /**
	+ * Gets an object from a folder by UID.
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ * @param string $uid Requested object UID
	+ *
	+ * @param array\|null
	+ */
	+ public function getObject($folderid, $deviceid, $type, $uid)
	+ {
	+ $folder = $this->getFolder($folderid, $deviceid, $type);
	+
	+ if (!$folder \|\| !$folder->valid) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ }
	+
	+ $result = $folder->get_object($uid);
	+
	+ if ($result === false) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ }
	+
	+ return $result;
	+ }
	+
	+ /**
	+ * Gets objects matching UID by prefix.
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ * @param string $uid Requested object UID prefix
	+ *
	+ * @param array\|iterable
	+ */
	+ public function getObjectsByUidPrefix($folderid, $deviceid, $type, $uid)
	+ {
	+ $folder = $this->getFolder($folderid, $deviceid, $type);
	+
	+ if (!$folder \|\| !$folder->valid) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ }
	+
	+ $result = $folder->select([['uid', '~*', $uid]]);
	+
	+ if ($result === false) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ }
	+
	+ return $result;
	+ }
	+
	+ /**
	+ * Set categories to an object
	+ *
	+ * @param object\|string $object UID or rcube_message object
	+ * @param array $categories List of Category names
	+ */
	+ public function setCategories($object, $categories)
	+ {
	+ if (!is_object($object)) {
	+ $config = kolab_storage_config::get_instance();
	+ $config->save_tags($object, $categories);
	+ return;
	+ }
	+
	+ $config = kolab_storage_config::get_instance();
	+ $delta = Syncroton_Registry::getPingTimeout();
	+ $uri = kolab_storage_config::get_message_uri($object->headers, $object->folder);
	+
	+ // for all tag objects...
	+ foreach ($config->get_tags() as $relation) {
	+ // resolve members if it wasn't done recently
	+ $uid = $relation['uid'];
	+ $force = empty($this->tag_rts[$uid]) \|\| $this->tag_rts[$uid] <= time() - $delta;
	+
	+ if ($force) {
	+ $config->resolve_members($relation, $force);
	+ $this->tag_rts[$relation['uid']] = time();
	+ }
	+
	+ $selected = !empty($categories) && in_array($relation['name'], $categories);
	+ $found = !empty($relation['members']) && in_array($uri, $relation['members']);
	+ $update = false;
	+
	+ // remove member from the relation
	+ if ($found && !$selected) {
	+ $relation['members'] = array_diff($relation['members'], (array) $uri);
	+ $update = true;
	+ }
	+ // add member to the relation
	+ else if (!$found && $selected) {
	+ $relation['members'][] = $uri;
	+ $update = true;
	+ }
	+
	+ if ($update) {
	+ $config->save($relation, 'relation');
	+ }
	+
	+ $categories = array_diff($categories, (array) $relation['name']);
	+ }
	+
	+ // create new relations
	+ if (!empty($categories)) {
	+ foreach ($categories as $tag) {
	+ $relation = [
	+ 'name' => $tag,
	+ 'members' => (array) $uri,
	+ 'category' => 'tag',
	+ ];
	+
	+ $config->save($relation, 'relation');
	+ }
	+ }
	+
	+ // make sure current folder is set correctly again
	+ $this->storage->set_folder($object->folder);
	+ }
	+
	+ /**
	+ * Search for existing objects in a folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ * @param array $filter Filter
	+ * @param int $result_type Type of the result (see kolab_sync_data::RESULT_* constants)
	+ * @param bool $force Force IMAP folder cache synchronization
	+ * @param bool $tags Enable tags/relations check (if supported)
	+ *
	+ * @return array\|int Search result as count or array of uids
	+ */
	+ public function searchEntries($folderid, $deviceid, $type, $filter, $result_type, $force, $tags)
	+ {
	+ if ($type != self::MODEL_EMAIL) {
	+ return $this->searchKolabEntries($folderid, $deviceid, $type, $filter, $result_type, $force, $tags);
	+ }
	+
	+ $filter_str = 'ALL UNDELETED';
	+
	+ // convert filter into one IMAP search string
	+ foreach ($filter as $idx => $filter_item) {
	+ if (is_array($filter_item)) {
	+ // This is a request for changes since last time
	+ // we'll use HIGHESTMODSEQ value from the last Sync
	+ if ($filter_item[0] == 'changed' && $filter_item[1] == '>') {
	+ $modseq_lasttime = $filter_item[2];
	+ $modseq_data = [];
	+ $modseq = (array) $this->modseq_get($deviceid, $folderid, $modseq_lasttime);
	+ }
	+ }
	+ else {
	+ $filter_str .= ' ' . $filter_item;
	+ }
	+ }
	+
	+ // get members of modified relations
	+ if ($tags && $this->relationSupport) {
	+ $changed_msgs = $this->getChangesByRelations($folderid, $deviceid, $type, $filter);
	+ }
	+
	+ $result = $result_type == kolab_sync_data::RESULT_COUNT ? 0 : [];
	+
	+ $foldername = $this->folder_id2name($folderid, $deviceid);
	+
	+ if ($foldername === null) {
	+ return $result;
	+ }
	+
	+ $this->storage->set_folder($foldername);
	+
	+ // Synchronize folder (if it wasn't synced in this request already)
	+ if ($force) {
	+ $this->storage->folder_sync($foldername);
	+ }
	+
	+ // We're in "get changes" mode
	+ if (isset($modseq_data)) {
	+ $folder_data = $this->storage->folder_data($foldername);
	+ $modified = false;
	+
	+ // If previous HIGHESTMODSEQ doesn't exist we can't get changes
	+ // We can only get folder's HIGHESTMODSEQ value and store it for the next try
	+ // Skip search if HIGHESTMODSEQ didn't change
	+ if (!empty($folder_data['HIGHESTMODSEQ'])) {
	+ $modseq_data[$foldername] = $folder_data['HIGHESTMODSEQ'];
	+ $modseq_old = isset($modseq[$foldername]) ? $modseq[$foldername] : null;
	+ if ($modseq_data[$foldername] != $modseq_old) {
	+ $modseq_update = true;
	+ if ($modseq && $modseq_old) {
	+ $modified = true;
	+ $filter_str .= " MODSEQ " . ($modseq_old + 1);
	+ }
	+ }
	+ }
	+ }
	+ else {
	+ $modified = true;
	+ }
	+
	+ // We could use messages cache by replacing search() with index()
	+ // in some cases. This however is possible only if user has skip_deleted=true,
	+ // in his Roundcube preferences, otherwise we'd make often cache re-initialization,
	+ // because Roundcube message cache can work only with one skip_deleted
	+ // setting at a time. We'd also need to make sure folder_sync() was called
	+ // before (see above).
	+ //
	+ // if ($filter_str == 'ALL UNDELETED')
	+ // $search = $this->storage->index($foldername, null, null, true, true);
	+ // else
	+
	+ if ($modified) {
	+ $search = $this->storage->search_once($foldername, $filter_str);
	+
	+ if (!($search instanceof rcube_result_index) \|\| $search->is_error()) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ }
	+
	+ switch ($result_type) {
	+ case kolab_sync_data::RESULT_COUNT:
	+ $result = $search->count();
	+ break;
	+
	+ case kolab_sync_data::RESULT_UID:
	+ $result = $search->get();
	+ break;
	+ }
	+ }
	+
	+ // handle relation changes
	+ if (!empty($changed_msgs)) {
	+ $members = $this->findRelationMembersInFolder($foldername, $changed_msgs, $filter);
	+
	+ switch ($result_type) {
	+ case kolab_sync_data::RESULT_COUNT:
	+ $result += count($members);
	+ break;
	+
	+ case kolab_sync_data::RESULT_UID:
	+ $result = array_values(array_unique(array_merge($result, $members)));
	+ break;
	+ }
	+ }
	+
	+ if (!empty($modseq_update)) {
	+ $this->modseq_set($deviceid, $folderid, $this->syncTimeStamp, $modseq_data);
	+
	+ // if previous modseq information does not exist save current set as it,
	+ // we would at least be able to detect changes since now
	+ if (empty($result) && empty($modseq)) {
	+ $this->modseq_set($deviceid, $folderid, $modseq_lasttime, $modseq_data);
	+ }
	+ }
	+
	+ return $result;
	+ }
	+
	+ /**
	+ * Search for existing objects in a folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ * @param array $filter Filter
	+ * @param int $result_type Type of the result (see kolab_sync_data::RESULT_* constants)
	+ * @param bool $force Force IMAP folder cache synchronization
	+ * @param bool $tags Enable tags/relations check (if supported)
	+ *
	+ * @return array\|int Search result as count or array of uids
	+ */
	+ protected function searchKolabEntries($folderid, $deviceid, $type, $filter, $result_type, $force, $tags)
	+ {
	+ // there's a PHP Warning from kolab_storage if $filter isn't an array
	+ if (empty($filter)) {
	+ $filter = [];
	+ } elseif ($tags && $this->relationSupport) {
	+ $changed_objects = $this->getChangesByRelations($folderid, $deviceid, $type, $filter);
	+ }
	+
	+ $folder = $this->getFolder($folderid, $deviceid, $type);
	+
	+ if (!$folder \|\| !$folder->valid) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ }
	+
	+ $error = false;
	+
	+ switch ($result_type) {
	+ case kolab_sync_data::RESULT_COUNT:
	+ $count = $folder->count($filter);
	+
	+ if ($count === null \|\| $count === false) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ } else {
	+ $result = (int) $count;
	+ }
	+ break;
	+
	+ case kolab_sync_data::RESULT_UID:
	+ $uids = $folder->get_uids($filter);
	+
	+ if (!is_array($uids)) {
	+ throw new Syncroton_Exception_Status(Syncroton_Exception_Status::SERVER_ERROR);
	+ } else {
	+ $result = $uids;
	+ }
	+ break;
	+ }
	+
	+ // handle tag modifications
	+ if (!empty($changed_objects)) {
	+ // build new filter
	+ // search objects mathing current filter,
	+ // relations may contain members of many types, we need to
	+ // search them by UID in all requested folders to get
	+ // only these with requested type (and that really exist
	+ // in specified folders)
	+ $tag_filter = [['uid', '=', $changed_objects]];
	+ foreach ($filter as $f) {
	+ if ($f[0] != 'changed') {
	+ $tag_filter[] = $f;
	+ }
	+ }
	+
	+ switch ($result_type) {
	+ case kolab_sync_data::RESULT_COUNT:
	+ // Note: this way we're potentally counting the same objects twice
	+ // I'm not sure if this is a problem, we most likely do not
	+ // need a precise result here
	+ $count = $folder->count($tag_filter);
	+ if ($count !== null && $count !== false) {
	+ $result += (int) $count;
	+ }
	+
	+ break;
	+
	+ case kolab_sync_data::RESULT_UID:
	+ $uids = $folder->get_uids($tag_filter);
	+ if (is_array($uids) && !empty($uids)) {
	+ $result = array_unique(array_merge($result, $uids));
	+ }
	+
	+ break;
	+ }
	+ }
	+
	+ return $result;
	+ }
	+
	+ /**
	+ * Find members (messages) in specified folder
	+ */
	+ protected function findRelationMembersInFolder($foldername, $members, $filter)
	+ {
	+ foreach ($members as $member) {
	+ // IMAP URI members
	+ if ($url = kolab_storage_config::parse_member_url($member)) {
	+ $result[$url['folder']][$url['uid']] = $url['params'];
	+ }
	+ }
	+
	+ // convert filter into one IMAP search string
	+ $filter_str = 'ALL UNDELETED';
	+ foreach ($filter as $filter_item) {
	+ if (is_string($filter_item)) {
	+ $filter_str .= ' ' . $filter_item;
	+ }
	+ }
	+
	+ $found = [];
	+
	+ // first find messages by UID
	+ if (!empty($result[$foldername])) {
	+ $index = $this->storage->search_once($foldername, 'UID '
	+ . rcube_imap_generic::compressMessageSet(array_keys($result[$foldername])));
	+ $found = $index->get();
	+
	+ // remove found messages from the $result
	+ if (!empty($found)) {
	+ $result[$foldername] = array_diff_key($result[$foldername], array_flip($found));
	+
	+ if (empty($result[$foldername])) {
	+ unset($result[$foldername]);
	+ }
	+
	+ // now apply the current filter to the found messages
	+ $index = $this->storage->search_once($foldername, $filter_str . ' UID '
	+ . rcube_imap_generic::compressMessageSet($found));
	+ $found = $index->get();
	+ }
	+ }
	+
	+ // search by message parameters
	+ if (!empty($result)) {
	+ // @TODO: do this search in chunks (for e.g. 25 messages)?
	+ $search = '';
	+ $search_count = 0;
	+
	+ foreach ($result as $data) {
	+ foreach ($data as $p) {
	+ $search_params = [];
	+ $search_count++;
	+
	+ foreach ($p as $key => $val) {
	+ $key = strtoupper($key);
	+ // don't search by subject, we don't want false-positives
	+ if ($key != 'SUBJECT') {
	+ $search_params[] = 'HEADER ' . $key . ' ' . rcube_imap_generic::escape($val);
	+ }
	+ }
	+
	+ $search .= ' (' . implode(' ', $search_params) . ')';
	+ }
	+ }
	+
	+ $search_str = str_repeat(' OR', $search_count-1) . $search;
	+
	+ // search messages in current folder
	+ $search = $this->storage->search_once($foldername, $search_str);
	+ $uids = $search->get();
	+
	+ if (!empty($uids)) {
	+ // add UIDs into the result
	+ $found = array_unique(array_merge($found, $uids));
	+ }
	+ }
	+
	+ return $found;
	+ }
	+
	+ /**
	+ * Detect changes of relation (tag) objects data and assigned objects
	+ * Returns relation member identifiers
	+ */
	+ protected function getChangesByRelations($folderid, $deviceid, $type, $filter)
	+ {
	+ // get period filter, create new objects filter
	+ foreach ($filter as $f) {
	+ if ($f[0] == 'changed' && $f[1] == '>') {
	+ $since = $f[2];
	+ }
	+ }
	+
	+ // this is not search for changes, do nothing
	+ if (empty($since)) {
	+ return;
	+ }
	+
	+ // get relations state from the last sync
	+ $last_state = (array) $this->relations_state_get($deviceid, $folderid, $since);
	+
	+ // get current relations state
	+ $config = kolab_storage_config::get_instance();
	+ $default = true;
	+ $filter = [
	+ ['type', '=', 'relation'],
	+ ['category', '=', 'tag']
	+ ];
	+
	+ $relations = $config->get_objects($filter, $default, 100);
	+
	+ $result = [];
	+ $changed = false;
	+
	+ // compare states, get members of changed relations
	+ foreach ($relations as $relation) {
	+ $rel_id = $relation['uid'];
	+
	+ if ($relation['changed']) {
	+ $relation['changed']->setTimezone(new DateTimeZone('UTC'));
	+ }
	+
	+ // last state unknown...
	+ if (empty($last_state[$rel_id])) {
	+ // ...get all members
	+ if (!empty($relation['members'])) {
	+ $changed = true;
	+ $result = array_merge($result, $relation['members']);
	+ }
	+ }
	+ // last state known, changed tag name...
	+ else if ($last_state[$rel_id]['name'] != $relation['name']) {
	+ // ...get all (old and new) members
	+ $members_old = explode("\n", $last_state[$rel_id]['members']);
	+ $changed = true;
	+ $members = array_unique(array_merge($relation['members'], $members_old));
	+ $result = array_merge($result, $members);
	+ }
	+ // last state known, any other change change...
	+ else if ($last_state[$rel_id]['changed'] < $relation['changed']->format('U')) {
	+ // ...find new and removed members
	+ $members_old = explode("\n", $last_state[$rel_id]['members']);
	+ $new = array_diff($relation['members'], $members_old);
	+ $removed = array_diff($members_old, $relation['members']);
	+
	+ if (!empty($new) \|\| !empty($removed)) {
	+ $changed = true;
	+ $result = array_merge($result, $new, $removed);
	+ }
	+ }
	+
	+ unset($last_state[$rel_id]);
	+ }
	+
	+ // get members of deleted relations
	+ if (!empty($last_state)) {
	+ $changed = true;
	+ foreach ($last_state as $relation) {
	+ $members = explode("\n", $relation['members']);
	+ $result = array_merge($result, $members);
	+ }
	+ }
	+
	+ // save current state
	+ if ($changed) {
	+ $data = [];
	+ foreach ($relations as $relation) {
	+ $data[$relation['uid']] = [
	+ 'name' => $relation['name'],
	+ 'changed' => $relation['changed']->format('U'),
	+ 'members' => implode("\n", (array)$relation['members']),
	+ ];
	+ }
	+
	+ $now = new DateTime('now', new DateTimeZone('UTC'));
	+
	+ $this->relations_state_set($deviceid, $folderid, $now, $data);
	+ }
	+
	+ // in mail mode return only message URIs
	+ if ($this->modelName == self::MODEL_EMAIL) {
	+ // lambda function to skip email members
	+ $filter_func = function($value) {
	+ return strpos($value, 'imap://') === 0;
	+ };
	+
	+ $result = array_filter(array_unique($result), $filter_func);
	+ }
	+ // otherwise return only object UIDs
	+ else {
	+ // lambda function to skip email members
	+ $filter_func = function($value) {
	+ return strpos($value, 'urn:uuid:') === 0;
	+ };
	+
	+ // lambda function to parse member URI
	+ $member_func = function($value) {
	+ if (strpos($value, 'urn:uuid:') === 0) {
	+ $value = substr($value, 9);
	+ }
	+ return $value;
	+ };
	+
	+ $result = array_map($member_func, array_filter(array_unique($result), $filter_func));
	+ }
	+
	+ return $result;
	+ }
	+
	+ /**
	+ * Subscribe default set of folders on device registration
	+ */
	+ protected function device_init_subscriptions($deviceid)
	+ {
	+ // INBOX always exists
	+ $this->folder_set('INBOX', $deviceid, 1);
	+
	+ $supported_types = [
	+ 'mail.drafts',
	+ 'mail.wastebasket',
	+ 'mail.sentitems',
	+ 'mail.outbox',
	+ 'event.default',
	+ 'contact.default',
	+ 'note.default',
	+ 'task.default',
	+ 'event',
	+ 'contact',
	+ 'note',
	+ 'task',
	+ 'event.confidential',
	+ 'event.private',
	+ 'task.confidential',
	+ 'task.private',
	+ ];
	+
	+ $rcube = rcube::get_instance();
	+ $config = $rcube->config;
	+ $mode = (int) $config->get('activesync_init_subscriptions');
	+ $folders = [];
	+
	+ // Subscribe to default folders
	+ $foldertypes = kolab_storage::folders_typedata();
	+
	+ if (!empty($foldertypes)) {
	+ $_foldertypes = array_intersect($foldertypes, $supported_types);
	+
	+ // get default folders
	+ foreach ($_foldertypes as $folder => $type) {
	+ // only personal folders
	+ if ($this->storage->folder_namespace($folder) == 'personal') {
	+ $flag = preg_match('/^(event\|task)/', $type) ? 2 : 1;
	+ $this->folder_set($folder, $deviceid, $flag);
	+ $folders[] = $folder;
	+ }
	+ }
	+ }
	+
	+ // we're in default mode, exit
	+ if (!$mode) {
	+ return;
	+ }
	+
	+ // below we support additionally all mail folders
	+ $supported_types[] = 'mail';
	+ $supported_types[] = 'mail.junkemail';
	+
	+ // get configured special folders
	+ $special_folders = [];
	+ $map = [
	+ 'drafts' => 'mail.drafts',
	+ 'junk' => 'mail.junkemail',
	+ 'sent' => 'mail.sentitems',
	+ 'trash' => 'mail.wastebasket',
	+ ];
	+
	+ foreach ($map as $folder => $type) {
	+ if ($folder = $config->get($folder . '_mbox')) {
	+ $special_folders[$folder] = $type;
	+ }
	+ }
	+
	+ // get folders list(s)
	+ if (($mode & self::INIT_ALL_PERSONAL) \|\| ($mode & self::INIT_ALL_OTHER) \|\| ($mode & self::INIT_ALL_SHARED)) {
	+ $all_folders = $this->storage->list_folders();
	+ if (($mode & self::INIT_SUB_PERSONAL) \|\| ($mode & self::INIT_SUB_OTHER) \|\| ($mode & self::INIT_SUB_SHARED)) {
	+ $subscribed_folders = $this->storage->list_folders_subscribed();
	+ }
	+ }
	+ else {
	+ $all_folders = $this->storage->list_folders_subscribed();
	+ }
	+
	+ foreach ($all_folders as $folder) {
	+ // folder already subscribed
	+ if (in_array($folder, $folders)) {
	+ continue;
	+ }
	+
	+ $type = ($foldertypes[$folder] ?? null) ?: 'mail';
	+ if ($type == 'mail' && isset($special_folders[$folder])) {
	+ $type = $special_folders[$folder];
	+ }
	+
	+ if (!in_array($type, $supported_types)) {
	+ continue;
	+ }
	+
	+ $ns = strtoupper($this->storage->folder_namespace($folder));
	+
	+ // subscribe the folder according to configured mode
	+ // and folder namespace/subscription status
	+ if (($mode & constant("self::INIT_ALL_{$ns}"))
	+ \|\| (($mode & constant("self::INIT_SUB_{$ns}"))
	+ && (!isset($subscribed_folders) \|\| in_array($folder, $subscribed_folders)))
	+ ) {
	+ $flag = preg_match('/^(event\|task)/', $type) ? 2 : 1;
	+ $this->folder_set($folder, $deviceid, $flag);
	+ }
	+ }
	+ }
	+
	+ /**
	+ * Helper method to decode saved IMAP metadata
	+ */
	+ protected function unserialize_metadata($str)
	+ {
	+ if (!empty($str)) {
	+ // Support old Z-Push annotation format
	+ if ($str[0] != '{') {
	+ $str = base64_decode($str);
	+ }
	+ $data = json_decode($str, true);
	+ return $data;
	+ }
	+
	+ return null;
	+ }
	+
	+ /**
	+ * Helper method to encode IMAP metadata for saving
	+ */
	+ protected function serialize_metadata($data)
	+ {
	+ if (!empty($data) && is_array($data)) {
	+ $data = json_encode($data);
	+// $data = base64_encode($data);
	+ return $data;
	+ }
	+
	+ return null;
	+ }
	+
	+ /**
	+ * Returns Kolab folder type for specified ActiveSync type ID
	+ */
	+ public static function type_activesync2kolab($type)
	+ {
	+ if (!empty(self::$types[$type])) {
	+ return self::$types[$type];
	+ }
	+
	+ return '';
	+ }
	+
	+ /**
	+ * Returns ActiveSync folder type for specified Kolab type
	+ */
	+ public static function type_kolab2activesync($type)
	+ {
	+ $type = preg_replace('/\.(confidential\|private)$/i', '', $type);
	+
	+ if ($key = array_search($type, self::$types)) {
	+ return $key;
	+ }
	+
	+ return key(self::$types);
	+ }
	+
	+ /**
	+ * Returns Kolab folder type for specified ActiveSync class name
	+ */
	+ public static function class_activesync2kolab($class)
	+ {
	+ if (!empty(self::$classes[$class])) {
	+ return self::$classes[$class];
	+ }
	+
	+ return '';
	+ }
	+
	+ /**
	+ * Returns folder data in Syncroton format
	+ */
	+ protected function folder_data($folder, $type)
	+ {
	+ // Folder name parameters
	+ $delim = $this->storage->get_hierarchy_delimiter();
	+ $items = explode($delim, $folder);
	+ $name = array_pop($items);
	+
	+ // Folder UID
	+ $folder_id = $this->folder_id($folder, $type);
	+
	+ // Folder type
	+ if (strcasecmp($folder, 'INBOX') === 0) {
	+ // INBOX is always inbox, prevent from issues related with a change of
	+ // folder type annotation (it can be initially unset).
	+ $type = 2;
	+ }
	+ else {
	+ $type = self::type_kolab2activesync($type);
	+
	+ // fix type, if there's no type annotation it's detected as UNKNOWN we'll use 'mail' (12)
	+ if ($type == 1) {
	+ $type = 12;
	+ }
	+ }
	+
	+ // Syncroton folder data array
	+ return [
	+ 'serverId' => $folder_id,
	+ 'parentId' => count($items) ? $this->folder_id(implode($delim, $items), $type) : 0,
	+ 'displayName' => rcube_charset::convert($name, 'UTF7-IMAP', kolab_sync::CHARSET),
	+ 'type' => $type,
	+ // for internal use
	+ 'imap_name' => $folder,
	+ ];
	+ }
	+
	+ /**
	+ * Builds folder ID based on folder name
	+ */
	+ public function folder_id($name, $type = null)
	+ {
	+ // ActiveSync expects folder identifiers to be max.64 characters
	+ // So we can't use just folder name
	+
	+ $name = (string) $name;
	+
	+ if ($name === '') {
	+ return null;
	+ }
	+
	+ if (isset($this->folder_uids[$name])) {
	+ return $this->folder_uids[$name];
	+ }
	+
	+/*
	+ @TODO: For now uniqueid annotation doesn't work, we will create UIDs by ourselves.
	+ There's one inconvenience of this solution: folder name/type change
	+ would be handled in ActiveSync as delete + create.
	+
	+ // get folders unique identifier
	+ $folderdata = $this->storage->get_metadata($name, self::UID_KEY);
	+
	+ if ($folderdata && !empty($folderdata[$name])) {
	+ $uid = $folderdata[$name][self::UID_KEY];
	+ return $this->folder_uids[$name] = $uid;
	+ }
	+*/
	+ if (strcasecmp($name, 'INBOX') === 0) {
	+ // INBOX is always inbox, prevent from issues related with a change of
	+ // folder type annotation (it can be initially unset).
	+ $type = 'mail.inbox';
	+ }
	+ else {
	+ if ($type === null) {
	+ $type = kolab_storage::folder_type($name);
	+ }
	+
	+ if ($type != null) {
	+ $type = preg_replace('/\.(confidential\|private)$/i', '', $type);
	+ }
	+ }
	+
	+ // Add type to folder UID hash, so type change can be detected by Syncroton
	+ $uid = $name . '!!' . $type;
	+ $uid = md5($uid);
	+
	+ return $this->folder_uids[$name] = $uid;
	+ }
	+
	+ /**
	+ * Returns IMAP folder name
	+ *
	+ * @param string $id Folder identifier
	+ * @param string $deviceid Device dentifier
	+ *
	+ * @return string Folder name (UTF7-IMAP)
	+ */
	+ public function folder_id2name($id, $deviceid)
	+ {
	+ // check in cache first
	+ if (!empty($this->folder_uids)) {
	+ if (($name = array_search($id, $this->folder_uids)) !== false) {
	+ return $name;
	+ }
	+ }
	+/*
	+ @TODO: see folder_id()
	+
	+ // get folders unique identifier
	+ $folderdata = $this->storage->get_metadata('*', self::UID_KEY);
	+
	+ foreach ((array)$folderdata as $folder => $data) {
	+ if (!empty($data[self::UID_KEY])) {
	+ $uid = $data[self::UID_KEY];
	+ $this->folder_uids[$folder] = $uid;
	+ if ($uid == $id) {
	+ $name = $folder;
	+ }
	+ }
	+ }
	+*/
	+ // get all folders of specified type
	+ $folderdata = $this->folder_meta();
	+
	+ if (!is_array($folderdata) \|\| $id === null) {
	+ return null;
	+ }
	+
	+ $name = null;
	+
	+ // check if folders are "subscribed" for activesync
	+ foreach ($folderdata as $folder => $meta) {
	+ if (empty($meta['FOLDER']) \|\| empty($meta['FOLDER'][$deviceid])
	+ \|\| empty($meta['FOLDER'][$deviceid]['S'])
	+ ) {
	+ continue;
	+ }
	+
	+ if ($uid = $this->folder_id($folder)) {
	+ $this->folder_uids[$folder] = $uid;
	+ }
	+
	+ if ($uid === $id) {
	+ $name = $folder;
	+ }
	+ }
	+
	+ return $name;
	+ }
	+
	+ /**
	+ */
	+ public function modseq_set($deviceid, $folderid, $synctime, $data)
	+ {
	+ $synctime = $synctime->format('Y-m-d H:i:s');
	+ $rcube = rcube::get_instance();
	+ $db = $rcube->get_dbh();
	+ $old_data = $this->modseq[$folderid][$synctime] ?? null;
	+
	+ if (empty($old_data)) {
	+ $this->modseq[$folderid][$synctime] = $data;
	+ $data = json_encode($data);
	+
	+ $db->set_option('ignore_key_errors', true);
	+ $db->query("INSERT INTO `syncroton_modseq` (`device_id`, `folder_id`, `synctime`, `data`)"
	+ ." VALUES (?, ?, ?, ?)",
	+ $deviceid, $folderid, $synctime, $data);
	+ $db->set_option('ignore_key_errors', false);
	+ }
	+ }
	+
	+ public function modseq_get($deviceid, $folderid, $synctime)
	+ {
	+ $synctime = $synctime->format('Y-m-d H:i:s');
	+
	+ if (empty($this->modseq[$folderid][$synctime])) {
	+ $this->modseq[$folderid] = [];
	+
	+ $rcube = rcube::get_instance();
	+ $db = $rcube->get_dbh();
	+
	+ $db->limitquery("SELECT `data`, `synctime` FROM `syncroton_modseq`"
	+ ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <= ?"
	+ ." ORDER BY `synctime` DESC",
	+ 0, 1, $deviceid, $folderid, $synctime);
	+
	+ if ($row = $db->fetch_assoc()) {
	+ $synctime = $row['synctime'];
	+ // @TODO: make sure synctime from sql is in "Y-m-d H:i:s" format
	+ $this->modseq[$folderid][$synctime] = json_decode($row['data'], true);
	+ }
	+
	+ // Cleanup: remove all records except the current one
	+ $db->query("DELETE FROM `syncroton_modseq`"
	+ ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <> ?",
	+ $deviceid, $folderid, $synctime);
	+ }
	+
	+ return @$this->modseq[$folderid][$synctime];
	+ }
	+
	+ /**
	+ * Set state of relation objects at specified point in time
	+ */
	+ public function relations_state_set($deviceid, $folderid, $synctime, $relations)
	+ {
	+ $synctime = $synctime->format('Y-m-d H:i:s');
	+ $rcube = rcube::get_instance();
	+ $db = $rcube->get_dbh();
	+ $old_data = $this->relations[$folderid][$synctime] ?? null;
	+
	+ if (empty($old_data)) {
	+ $this->relations[$folderid][$synctime] = $relations;
	+ $data = rcube_charset::clean(json_encode($relations));
	+
	+ $db->set_option('ignore_key_errors', true);
	+ $db->query("INSERT INTO `syncroton_relations_state`"
	+ ." (`device_id`, `folder_id`, `synctime`, `data`)"
	+ ." VALUES (?, ?, ?, ?)",
	+ $deviceid, $folderid, $synctime, $data);
	+ $db->set_option('ignore_key_errors', false);
	+ }
	+ }
	+
	+ /**
	+ * Get state of relation objects at specified point in time
	+ */
	+ public function relations_state_get($deviceid, $folderid, $synctime)
	+ {
	+ $synctime = $synctime->format('Y-m-d H:i:s');
	+
	+ if (empty($this->relations[$folderid][$synctime])) {
	+ $this->relations[$folderid] = [];
	+
	+ $rcube = rcube::get_instance();
	+ $db = $rcube->get_dbh();
	+
	+ $db->limitquery("SELECT `data`, `synctime` FROM `syncroton_relations_state`"
	+ ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <= ?"
	+ ." ORDER BY `synctime` DESC",
	+ 0, 1, $deviceid, $folderid, $synctime);
	+
	+ if ($row = $db->fetch_assoc()) {
	+ $synctime = $row['synctime'];
	+ // @TODO: make sure synctime from sql is in "Y-m-d H:i:s" format
	+ $this->relations[$folderid][$synctime] = json_decode($row['data'], true);
	+ }
	+
	+ // Cleanup: remove all records except the current one
	+ $db->query("DELETE FROM `syncroton_relations_state`"
	+ ." WHERE `device_id` = ? AND `folder_id` = ? AND `synctime` <> ?",
	+ $deviceid, $folderid, $synctime);
	+ }
	+
	+ return @$this->relations[$folderid][$synctime];
	+ }
	+
	+ /**
	+ * Return last storage error
	+ */
	+ public static function last_error()
	+ {
	+ return kolab_storage::$last_error;
	+ }
	+
	+ /**
	+ * Compares two arrays
	+ *
	+ * @param array $array1
	+ * @param array $array2
	+ *
	+ * @return bool True if arrays differs, False otherwise
	+ */
	+ protected static function data_array_diff($array1, $array2)
	+ {
	+ if (!is_array($array1) \|\| !is_array($array2)) {
	+ return $array1 != $array2;
	+ }
	+
	+ if (count($array1) != count($array2)) {
	+ return true;
	+ }
	+
	+ foreach ($array1 as $key => $val) {
	+ if (!array_key_exists($key, $array2)) {
	+ return true;
	+ }
	+ if ($val !== $array2[$key]) {
	+ return true;
	+ }
	+ }
	+
	+ return false;
	+ }
	+}
	diff --git a/lib/kolab_sync_storage_kolab4.php b/lib/kolab_sync_storage_kolab4.php
	new file mode 100644
	--- /dev/null
	+++ b/lib/kolab_sync_storage_kolab4.php
	@@ -0,0 +1,592 @@
	+<?php
	+
	+/**
	+ +--------------------------------------------------------------------------+
	+ \| Kolab Sync (ActiveSync for Kolab) \|
	+ \| \|
	+ \| Copyright (C) 2011-2023, Apheleia IT AG <contact@apheleia-it.ch> \|
	+ \| \|
	+ \| 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/> \|
	+ +--------------------------------------------------------------------------+
	+ \| Author: Aleksander Machniak <machniak@kolabsys.com> \|
	+ +--------------------------------------------------------------------------+
	+*/
	+
	+/**
	+ * Storage handling class with Kolab 4 support (IMAP + CalDAV + CardDAV)
	+ */
	+class kolab_sync_storage_kolab4 extends kolab_sync_storage
	+{
	+ protected $davStorage = null;
	+ protected $relationSupport = false;
	+
	+ /**
	+ * This implements the 'singleton' design pattern
	+ *
	+ * @return kolab_sync_storage_kolab4 The one and only instance
	+ */
	+ public static function get_instance()
	+ {
	+ if (!self::$instance) {
	+ self::$instance = new kolab_sync_storage_kolab4();
	+ self::$instance->startup(); // init AFTER object was linked with self::$instance
	+ }
	+
	+ return self::$instance;
	+ }
	+
	+ /**
	+ * Class initialization
	+ */
	+ public function startup()
	+ {
	+ $sync = kolab_sync::get_instance();
	+
	+ if ($sync->username === null \|\| $sync->password === null) {
	+ throw new Exception("Unsupported storage handler use!");
	+ }
	+
	+ $url = $sync->config->get('activesync_dav_server', 'http://localhost');
	+
	+ if (strpos($url, '://') === false) {
	+ $url = 'http://' . $url;
	+ }
	+
	+ // Inject user+password to the URL, there's no other way to pass it to the DAV client
	+ $url = str_replace('://', '://' . rawurlencode($sync->username) . ':' . rawurlencode($sync->password) . '@', $url);
	+
	+ $this->davStorage = new kolab_storage_dav($url); // DAV
	+ $this->storage = $sync->get_storage(); // IMAP
	+
	+ // set additional header used by libkolab
	+ $this->storage->set_options([
	+ 'skip_deleted' => true,
	+ 'threading' => false,
	+ ]);
	+
	+ // Disable paging
	+ $this->storage->set_pagesize(999999);
	+ }
	+
	+ /**
	+ * Get list of folders available for sync
	+ *
	+ * @param string $deviceid Device identifier
	+ * @param string $type Folder (class) type
	+ * @param bool $flat_mode Enables flat-list mode
	+ *
	+ * @return array\|bool List of mailbox folders, False on backend failure
	+ */
	+ public function folders_list($deviceid, $type, $flat_mode = false)
	+ {
	+ $list = [];
	+
	+ // get mail folders subscribed for sync
	+ if ($type === self::MODEL_EMAIL) {
	+ $folderdata = $this->folder_meta();
	+
	+ if (!is_array($folderdata)) {
	+ return false;
	+ }
	+
	+ $special_folders = $this->storage->get_special_folders(true);
	+ $type_map = [
	+ 'drafts' => 3,
	+ 'trash' => 4,
	+ 'sent' => 5,
	+ ];
	+
	+ // Get the folders "subscribed" for activesync
	+ foreach ($folderdata as $folder => $meta) {
	+ if (empty($meta['FOLDER']) \|\| empty($meta['FOLDER'][$deviceid])
	+ \|\| empty($meta['FOLDER'][$deviceid]['S'])
	+ ) {
	+ continue;
	+ }
	+
	+ // Force numeric folder name to be a string (T1283)
	+ $folder = (string) $folder;
	+
	+ // Activesync folder properties
	+ $folder_data = $this->folder_data($folder, 'mail');
	+
	+ // Set proper type for special folders
	+ if (($type = array_search($folder, $special_folders)) && isset($type_map[$type])) {
	+ $folder_data['type'] = $type_map[$type];
	+ }
	+
	+ $list[$folder_data['serverId']] = $folder_data;
	+ }
	+ }
	+ else if (in_array($type, [self::MODEL_CONTACTS, self::MODEL_CALENDAR, self::MODEL_TASKS])) {
	+ $list = [];
	+
	+ // TODO: For now all DAV folders are subscribed
	+ foreach ($this->davStorage->get_folders($type) as $folder) {
	+ $folder_data = $this->folder_data($folder, $type);
	+ $list[$folder_data['serverId']] = $folder_data;
	+ }
	+
	+ return $list;
	+ }
	+/*
	+ // TODO
	+ if ($flat_mode) {
	+ $list = $this->folders_list_flat($list, $type, $typedata);
	+ }
	+*/
	+ return $list;
	+ }
	+
	+ /**
	+ * Creates folder and subscribes to the device
	+ *
	+ * @param string $name Folder name (UTF8)
	+ * @param int $type Folder (ActiveSync) type
	+ * @param string $deviceid Device identifier
	+ * @param ?string $parentid Parent folder identifier
	+ *
	+ * @return string\|false New folder identifier on success, False on failure
	+ */
	+ public function folder_create($name, $type, $deviceid, $parentid = null)
	+ {
	+ // Mail folder
	+ if ($type <= 6 \|\| $type == 12) {
	+ $parent = null;
	+ $name = rcube_charset::convert($name, kolab_sync::CHARSET, 'UTF7-IMAP');
	+
	+ if ($parentid) {
	+ $parent = $this->folder_id2name($parentid, $deviceid);
	+
	+ if ($parent === null) {
	+ throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::PARENT_NOT_FOUND);
	+ }
	+ }
	+
	+ if ($parent !== null) {
	+ $delim = $this->storage->get_hierarchy_delimiter();
	+ $name = $parent . $delim . $name;
	+ }
	+
	+ if ($this->storage->folder_exists($name)) {
	+ throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::FOLDER_EXISTS);
	+ }
	+
	+ // TODO: Support setting folder types?
	+
	+ $created = $this->storage->create_folder($name, true);
	+
	+ if ($created) {
	+ // Set ActiveSync subscription flag
	+ $this->folder_set($name, $deviceid, 1);
	+
	+ return $this->folder_id($name, 'mail');
	+ }
	+
	+ // Special case when client tries to create a subfolder of INBOX
	+ // which is not possible on Cyrus-IMAP (T2223)
	+ if ($parent == 'INBOX' && stripos($this->last_error(), 'invalid') !== false) {
	+ throw new Syncroton_Exception('', Syncroton_Exception_Status_FolderCreate::SPECIAL_FOLDER);
	+ }
	+
	+ return false;
	+ }
	+ else if ($type == 8 \|\| $type == 13 \|\| $type == 7 \|\| $type == 15 \|\| $type == 9 \|\| $type == 14) {
	+ // DAV folder
	+ $type = preg_replace('\|\..*\|', '', self::type_activesync2kolab($type));
	+
	+ // TODO: Folder hierarchy support
	+
	+ // Check if folder exists
	+ foreach ($this->davStorage->get_folders($type) as $folder) {
	+ if ($folder->get_name() == $name) {
	+ throw new Syncroton_Exception_Status_FolderCreate(Syncroton_Exception_Status_FolderCreate::FOLDER_EXISTS);
	+ }
	+ }
	+
	+ $props = ['name' => $name, 'type' => $type];
	+
	+ if ($id = $this->davStorage->folder_update($props)) {
	+ return "DAV:{$type}:{$id}";
	+ }
	+
	+ return false;
	+ }
	+
	+ throw new \Exception("Not implemented");
	+ }
	+
	+ /**
	+ * Renames a folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $new_name New folder name (UTF8)
	+ * @param ?string $parentid Folder parent identifier
	+ *
	+ * @return bool True on success, False on failure
	+ */
	+ public function folder_rename($folderid, $deviceid, $new_name, $parentid)
	+ {
	+ // DAV folder
	+ if (strpos($folderid, 'DAV:') === 0) {
	+ [, $type, $id] = explode(':', $folderid);
	+ $props = [
	+ 'id' => $id,
	+ 'name' => $new_name,
	+ 'type' => $type,
	+ ];
	+
	+ // TODO: Folder hierarchy support
	+
	+ return $this->davStorage->folder_update($props) !== false;
	+ }
	+
	+ // Mail folder
	+ $old_name = $this->folder_id2name($folderid, $deviceid);
	+
	+ if ($parentid) {
	+ $parent = $this->folder_id2name($parentid, $deviceid);
	+ }
	+
	+ $name = rcube_charset::convert($new_name, kolab_sync::CHARSET, 'UTF7-IMAP');
	+
	+ if (isset($parent)) {
	+ $delim = $this->storage->get_hierarchy_delimiter();
	+ $name = $parent . $delim . $name;
	+ }
	+
	+ if ($name === $old_name) {
	+ return true;
	+ }
	+
	+ $this->folder_meta = null;
	+
	+ return $this->storage->rename_folder($old_name, $name);
	+ }
	+
	+ /**
	+ * Deletes folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ *
	+ * @param bool True on success, False otherwise
	+ */
	+ public function folder_delete($folderid, $deviceid)
	+ {
	+ // DAV folder
	+ if (strpos($folderid, 'DAV:') === 0) {
	+ [, $type, $id] = explode(':', $folderid);
	+
	+ return $this->davStorage->folder_delete($id, $type) !== false;
	+ }
	+
	+ // Mail folder
	+ $name = $this->folder_id2name($folderid, $deviceid);
	+
	+ unset($this->folder_meta[$name]);
	+
	+ return $this->storage->delete_folder($name);
	+ }
	+
	+ /**
	+ * Deletes contents of a folder
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param bool $recursive Apply to the folder and its subfolders
	+ *
	+ * @param bool True on success, False otherwise
	+ */
	+ public function folder_empty($folderid, $deviceid, $recursive = false)
	+ {
	+ // DAV folder
	+ if (strpos($folderid, 'DAV:') === 0) {
	+ [, $type, $id] = explode(':', $folderid);
	+
	+ if ($folder = $this->davStorage->get_folder($id, $type)) {
	+ return $folder->delete_all();
	+ }
	+
	+ // TODO: $recursive=true
	+
	+ return false;
	+ }
	+
	+ // Mail folder
	+ return parent::folder_empty($folderid, $deviceid, $recursive);
	+ }
	+
	+ /**
	+ * Returns folder data in Syncroton format
	+ */
	+ protected function folder_data($folder, $type)
	+ {
	+ // Mail folders
	+ if (strpos($type, 'mail') === 0) {
	+ return parent::folder_data($folder, $type);
	+ }
	+
	+ // DAV folders
	+ return [
	+ 'serverId' => "DAV:{$type}:{$folder->id}",
	+ 'parentId' => 0, // TODO: Folder hierarchy
	+ 'displayName' => $folder->get_name(),
	+ 'type' => $this->type_kolab2activesync($type),
	+ ];
	+ }
	+
	+ /**
	+ * Builds folder ID based on folder name
	+ *
	+ * @param string $name Folder name (UTF7-IMAP)
	+ * @param string $type Kolab folder type
	+ *
	+ * @return string Folder identifier (up to 64 characters)
	+ */
	+ public function folder_id($name, $type = null)
	+ {
	+ if (!$type) {
	+ $type = 'mail';
	+ }
	+
	+ // ActiveSync expects folder identifiers to be max.64 characters
	+ // So we can't use just folder name
	+ $name = (string) $name;
	+
	+ if ($name === '') {
	+ return null;
	+ }
	+
	+ if (strpos($type, 'mail') !== 0) {
	+ throw new Exception("Unsupported folder_id() call on a DAV folder");
	+ }
	+
	+ if (isset($this->folder_uids[$name])) {
	+ return $this->folder_uids[$name];
	+ }
	+/*
	+ @TODO: For now uniqueid annotation doesn't work, we will create UIDs by ourselves.
	+ There's one inconvenience of this solution: folder name/type change
	+ would be handled in ActiveSync as delete + create.
	+ @TODO: Consider using MAILBOXID (RFC8474) that Cyrus v3 supports
	+
	+ // get folders unique identifier
	+ $folderdata = $this->storage->get_metadata($name, self::UID_KEY);
	+
	+ if ($folderdata && !empty($folderdata[$name])) {
	+ $uid = $folderdata[$name][self::UID_KEY];
	+ return $this->folder_uids[$name] = $uid;
	+ }
	+*/
	+ if (strcasecmp($name, 'INBOX') === 0) {
	+ // INBOX is always inbox, prevent from issues related with a change of
	+ // folder type annotation (it can be initially unset).
	+ $type = 'mail.inbox';
	+ }
	+
	+ // Add type to folder UID hash, so type change can be detected by Syncroton
	+ $uid = $name . '!!' . $type;
	+ $uid = md5($uid);
	+
	+ return $this->folder_uids[$name] = $uid;
	+ }
	+
	+ /**
	+ * Returns IMAP folder name
	+ *
	+ * @param string $id Folder identifier
	+ * @param string $deviceid Device dentifier
	+ *
	+ * @return string Folder name (UTF7-IMAP)
	+ */
	+ public function folder_id2name($id, $deviceid)
	+ {
	+ // TODO: This method should become protected and be used for mail folders only
	+ if (strpos($id, 'DAV:') === 0) {
	+ throw new Exception("Unsupported folder_id2name() call on a DAV folder");
	+ }
	+
	+ // check in cache first
	+ if (!empty($this->folder_uids)) {
	+ if (($name = array_search($id, $this->folder_uids)) !== false) {
	+ return $name;
	+ }
	+ }
	+
	+ // get all folders of specified type
	+ $folderdata = $this->folder_meta();
	+
	+ if (!is_array($folderdata) \|\| $id === null) {
	+ return null;
	+ }
	+
	+ // check if folders are "subscribed" for activesync
	+ foreach ($folderdata as $folder => $meta) {
	+ if (empty($meta['FOLDER']) \|\| empty($meta['FOLDER'][$deviceid])
	+ \|\| empty($meta['FOLDER'][$deviceid]['S'])
	+ ) {
	+ continue;
	+ }
	+
	+ if ($uid = self::folder_id($folder, 'mail')) {
	+ $this->folder_uids[$folder] = $uid;
	+ }
	+
	+ if ($uid === $id) {
	+ $name = $folder;
	+ }
	+ }
	+
	+ return $name;
	+ }
	+
	+ /**
	+ * Returns list of categories assigned to an object
	+ *
	+ * @param object\|string $object UID or rcube_message object
	+ * @param array $categories Addition tag names to merge with
	+ *
	+ * @return array List of categories
	+ */
	+ public function getCategories($object, $categories = [])
	+ {
	+ // TODO
	+ return $categories;
	+ }
	+
	+ /**
	+ * Gets kolab_storage_folder object from Activesync folder ID.
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ *
	+ * @param ?kolab_storage_folder
	+ */
	+ public function getFolder($folderid, $deviceid, $type)
	+ {
	+ if (strpos($folderid, 'DAV:') !== 0) {
	+ throw new Exception("Unsupported getFolder() call on a mail folder");
	+ }
	+
	+ $unique_key = "$folderid:$deviceid:$type";
	+
	+ if (array_key_exists($unique_key, $this->folders)) {
	+ return $this->folders[$unique_key];
	+ }
	+
	+ [, $type, $id] = explode(':', $folderid);
	+
	+ return $this->folders[$unique_key] = $this->davStorage->get_folder($id, $type);
	+ }
	+
	+ /**
	+ * Gets Activesync preferences for a folder.
	+ *
	+ * @param string $folderid Folder identifier
	+ * @param string $deviceid Device identifier
	+ * @param string $type Activesync model name (folder type)
	+ *
	+ * @param array
	+ */
	+ public function getFolderConfig($folderid, $deviceid, $type)
	+ {
	+ // TODO: Get "alarms" from the DAV folder props, or implement
	+ // a storage for folder properties
	+ return [
	+ 'ALARMS' => true,
	+ ];
	+ }
	+
	+ /**
	+ * Set categories to an object
	+ *
	+ * @param object\|string $object UID or rcube_message object
	+ * @param array $categories List of Category names
	+ */
	+ public function setCategories($object, $categories)
	+ {
	+ // TODO
	+ }
	+
	+ /**
	+ * Return last storage error
	+ */
	+ public static function last_error()
	+ {
	+ // TODO
	+ return null;
	+ }
	+
	+ /**
	+ * Subscribe default set of folders on device registration
	+ */
	+ protected function device_init_subscriptions($deviceid)
	+ {
	+ $config = rcube::get_instance()->config;
	+ $mode = (int) $config->get('activesync_init_subscriptions');
	+
	+ // Special folders only
	+ if (!$mode) {
	+ $all_folders = $this->storage->get_special_folders(true);
	+ // We do not subscribe to the Spam folder by default, same as the old Kolab driver does
	+ unset($all_folders['junk']);
	+ $all_folders = array_unique(array_merge(['INBOX'], array_values($all_folders)));
	+ }
	+ // other modes
	+ elseif (($mode & self::INIT_ALL_PERSONAL) \|\| ($mode & self::INIT_ALL_OTHER) \|\| ($mode & self::INIT_ALL_SHARED)) {
	+ $all_folders = $this->storage->list_folders();
	+ if (($mode & self::INIT_SUB_PERSONAL) \|\| ($mode & self::INIT_SUB_OTHER) \|\| ($mode & self::INIT_SUB_SHARED)) {
	+ $subscribed_folders = $this->storage->list_folders_subscribed();
	+ }
	+ }
	+ else {
	+ $all_folders = $this->storage->list_folders_subscribed();
	+ }
	+
	+ foreach ($all_folders as $folder) {
	+ $ns = strtoupper($this->storage->folder_namespace($folder));
	+
	+ // subscribe the folder according to configured mode
	+ // and folder namespace/subscription status
	+ if (!$mode
	+ \|\| ($mode & constant("self::INIT_ALL_{$ns}"))
	+ \|\| (($mode & constant("self::INIT_SUB_{$ns}")) && (!isset($subscribed_folders) \|\| in_array($folder, $subscribed_folders)))
	+ ) {
	+ $this->folder_set($folder, $deviceid, 1);
	+ }
	+ }
	+
	+ // TODO: Subscribe personal DAV folders, for now we assume all are subscribed
	+ // TODO: Subscribe shared DAV folders
	+ }
	+
	+ /**
	+ * Get all DAV folders of all types
	+ */
	+ protected function dav_all_folders()
	+ {
	+ $list = [];
	+
	+ // TODO: For performance reasons this should be one HTTP request, not three
	+ foreach ([self::MODEL_CONTACTS, self::MODEL_CALENDAR, self::MODEL_TASKS] as $type) {
	+ $folders = $this->davStorage->get_folders($type);
	+ $list = array_merge($list, $folders);
	+ }
	+
	+ return $list;
	+ }
	+}
	diff --git a/tests/Sync/FoldersTest.php b/tests/Sync/FoldersTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/FoldersTest.php
	@@ -0,0 +1,389 @@
	+<?php
	+
	+class FoldersTest extends Tests\SyncTestCase
	+{
	+ /**
	+ * Test FolderSync command
	+ */
	+ public function testFolderSync()
	+ {
	+ // Note: We essentially assume the test account is in an initial state, extra folders may break tests
	+ // Anyway, we first remove folders that might have been created during tests in this file
	+ $this->deleteTestFolder('Test Folder', 'mail');
	+ $this->deleteTestFolder('Test Folder New', 'mail');
	+ $this->deleteTestFolder('Test Contacts Folder', 'contact');
	+ $this->deleteTestFolder('Test Contacts New', 'contact');
	+
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderSync xmlns="uri:FolderHierarchy">
	+ <SyncKey>0</SyncKey>
	+ </FolderSync>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderSync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ // Note: We're expecting activesync_init_subscriptions=0 here.
	+ if ($this->isStorageDriver('kolab4')) {
	+ $folders = [
	+ ['Calendar', Syncroton_Command_FolderSync::FOLDERTYPE_CALENDAR],
	+ ['Contacts', Syncroton_Command_FolderSync::FOLDERTYPE_CONTACT],
	+ ['INBOX', Syncroton_Command_FolderSync::FOLDERTYPE_INBOX],
	+ ['Drafts', Syncroton_Command_FolderSync::FOLDERTYPE_DRAFTS],
	+ ['Sent', Syncroton_Command_FolderSync::FOLDERTYPE_SENTMAIL],
	+ ['Trash', Syncroton_Command_FolderSync::FOLDERTYPE_DELETEDITEMS],
	+ ['Tasks', Syncroton_Command_FolderSync::FOLDERTYPE_TASK],
	+ ];
	+
	+ } else {
	+ $folders = [
	+ ['Calendar', Syncroton_Command_FolderSync::FOLDERTYPE_CALENDAR],
	+ ['Contacts', Syncroton_Command_FolderSync::FOLDERTYPE_CONTACT],
	+ ['INBOX', Syncroton_Command_FolderSync::FOLDERTYPE_INBOX],
	+ ['Drafts', Syncroton_Command_FolderSync::FOLDERTYPE_DRAFTS],
	+ ['Sent', Syncroton_Command_FolderSync::FOLDERTYPE_SENTMAIL],
	+ ['Trash', Syncroton_Command_FolderSync::FOLDERTYPE_DELETEDITEMS],
	+ ['Notes', Syncroton_Command_FolderSync::FOLDERTYPE_NOTE],
	+ ['Tasks', Syncroton_Command_FolderSync::FOLDERTYPE_TASK],
	+ ];
	+ }
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame(strval(count($folders)), $xpath->query("//ns:FolderSync/ns:Changes/ns:Count")->item(0)->nodeValue);
	+
	+ foreach ($folders as $idx => $folder) {
	+ $this->assertSame($folder[0], $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:DisplayName")->item($idx)->nodeValue);
	+ $this->assertSame((string) $folder[1], $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:Type")->item($idx)->nodeValue);
	+ $this->assertSame('0', $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:ParentId")->item($idx)->nodeValue);
	+ }
	+
	+ // Test with multi-folder support enabled
	+ self::$deviceType = 'iphone';
	+
	+ $response = $this->request($request, 'FolderSync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ if ($this->isStorageDriver('kolab4')) {
	+ $folders = [
	+ ['Calendar', Syncroton_Command_FolderSync::FOLDERTYPE_CALENDAR_USER_CREATED],
	+ // Note: Kolab 4 with Cyrus DAV uses Addressbook, but Kolab 3 with iRony would use 'Contacts'
	+ ['/^(Contacts\|Addressbook)$/', Syncroton_Command_FolderSync::FOLDERTYPE_CONTACT_USER_CREATED],
	+ ['INBOX', Syncroton_Command_FolderSync::FOLDERTYPE_INBOX],
	+ ['Drafts', Syncroton_Command_FolderSync::FOLDERTYPE_DRAFTS],
	+ ['Sent', Syncroton_Command_FolderSync::FOLDERTYPE_SENTMAIL],
	+ ['Trash', Syncroton_Command_FolderSync::FOLDERTYPE_DELETEDITEMS],
	+ // Note: For now Kolab 4 uses the same Calendar folder for calendar and tasks
	+ ['/^(Tasks\|Calendar)$/', Syncroton_Command_FolderSync::FOLDERTYPE_TASK_USER_CREATED]
	+ ];
	+ }
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame(strval(count($folders)), $xpath->query("//ns:FolderSync/ns:Changes/ns:Count")->item(0)->nodeValue);
	+
	+ foreach ($folders as $idx => $folder) {
	+ $displayName = $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:DisplayName")->item($idx)->nodeValue;
	+ if (str_starts_with($folder[0], '/')) {
	+ $this->assertMatchesRegularExpression($folder[0], $displayName);
	+ } else {
	+ $this->assertSame($folder[0], $displayName);
	+ }
	+ $this->assertSame((string) $folder[1], $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:Type")->item($idx)->nodeValue);
	+ $this->assertSame('0', $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:ParentId")->item($idx)->nodeValue);
	+ $idx++;
	+ }
	+
	+ // After we switched to multi-folder supported mode we expect next FolderSync
	+ // to delete the old "collective" folders
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderSync xmlns="uri:FolderHierarchy">
	+ <SyncKey>1</SyncKey>
	+ </FolderSync>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderSync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $deleted = $this->isStorageDriver('kolab4') ? 3 : 4; // No Notes folder in Kolab4
	+ $syncKey = 2;
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval($syncKey), $xpath->query("//ns:FolderSync/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame(strval($deleted), $xpath->query("//ns:FolderSync/ns:Changes/ns:Count")->item(0)->nodeValue);
	+ $this->assertSame($deleted, $xpath->query("//ns:FolderSync/ns:Changes/ns:Delete")->length);
	+
	+ return $syncKey;
	+ }
	+
	+ /**
	+ * Test FolderCreate command
	+ *
	+ * @depends testFolderSync
	+ */
	+ public function testFolderCreate($syncKey)
	+ {
	+ // Multi-folder mode
	+ self::$deviceType = 'iphone';
	+
	+ // Create a mail folder
	+ $folderName1 = 'Test Folder';
	+ $folderType = Syncroton_Command_FolderSync::FOLDERTYPE_MAIL_USER_CREATED;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderCreate xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <ParentId>0</ParentId>
	+ <DisplayName>{$folderName1}</DisplayName>
	+ <Type>{$folderType}</Type>
	+ </FolderCreate>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderCreate');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderCreate/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("//ns:FolderCreate/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame(1, $xpath->query("//ns:FolderCreate/ns:ServerId")->count());
	+ $folder1 = $xpath->query("//ns:FolderCreate/ns:ServerId")->item(0)->nodeValue;
	+
	+ // Note: After FolderCreate there are no changes in the following FolderSync expected
	+
	+ // Create a contacts folder
	+ $folderName2 = 'Test Contacts Folder';
	+ $folderType = Syncroton_Command_FolderSync::FOLDERTYPE_CONTACT_USER_CREATED;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderCreate xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <ParentId>0</ParentId>
	+ <DisplayName>{$folderName2}</DisplayName>
	+ <Type>{$folderType}</Type>
	+ </FolderCreate>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderCreate');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderCreate/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("//ns:FolderCreate/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame(1, $xpath->query("//ns:FolderCreate/ns:ServerId")->count());
	+ $folder2 = $xpath->query("//ns:FolderCreate/ns:ServerId")->item(0)->nodeValue;
	+
	+ // Note: After FolderCreate there are no changes in the following FolderSync expected
	+
	+ // TODO: Test folder with a parent
	+
	+ return [
	+ 'SyncKey' => $syncKey,
	+ 'folders' => [
	+ $folder1,
	+ $folder2,
	+ ]
	+ ];
	+ }
	+
	+ /**
	+ * Test FolderUpdate command
	+ *
	+ * @depends testFolderCreate
	+ */
	+ public function testFolderUpdate($params)
	+ {
	+ // Multi-folder mode
	+ self::$deviceType = 'iphone';
	+
	+ // Test renaming a mail folder
	+ $folderType = Syncroton_Command_FolderSync::FOLDERTYPE_MAIL_USER_CREATED;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderUpdate xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$params['SyncKey']}</SyncKey>
	+ <ServerId>{$params['folders'][0]}</ServerId>
	+ <ParentId/>
	+ <DisplayName>Test Folder New</DisplayName>
	+ <Type>{$folderType}</Type>
	+ </FolderUpdate>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderUpdate');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderUpdate/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params['SyncKey']), $xpath->query("//ns:FolderUpdate/ns:SyncKey")->item(0)->nodeValue);
	+
	+ // Test FolderSync after folder update, get the new folder id (for delete test)
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderSync xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$params['SyncKey']}</SyncKey>
	+ </FolderSync>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderSync');
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ // Note we expect Add+Delete here, instead of Update (but this could change in the future)
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params['SyncKey']), $xpath->query("//ns:FolderSync/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame(1, $xpath->query("//ns:FolderSync/ns:Changes/ns:Add")->length);
	+ $this->assertSame(1, $xpath->query("//ns:FolderSync/ns:Changes/ns:Delete")->length);
	+ $this->assertSame($params['folders'][0], $xpath->query("//ns:FolderSync/ns:Changes/ns:Delete/ns:ServerId")->item(0)->nodeValue);
	+ $this->assertSame('0', $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:ParentId")->item(0)->nodeValue);
	+ $this->assertSame('Test Folder New', $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:DisplayName")->item(0)->nodeValue);
	+ $this->assertSame(strval($folderType), $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:Type")->item(0)->nodeValue);
	+ $params['folders'][0] = $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:ServerId")->item(0)->nodeValue;
	+
	+ // Test renaming a contacts folder
	+ $folderType = Syncroton_Command_FolderSync::FOLDERTYPE_CONTACT_USER_CREATED;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderUpdate xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$params['SyncKey']}</SyncKey>
	+ <ServerId>{$params['folders'][1]}</ServerId>
	+ <ParentId/>
	+ <DisplayName>Test Contacts New</DisplayName>
	+ <Type>{$folderType}</Type>
	+ </FolderUpdate>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderUpdate');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderUpdate/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params['SyncKey']), $xpath->query("//ns:FolderUpdate/ns:SyncKey")->item(0)->nodeValue);
	+
	+ // Test FolderSync after folder update, get the new folder id (for delete test)
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderSync xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$params['SyncKey']}</SyncKey>
	+ </FolderSync>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderSync');
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params['SyncKey']), $xpath->query("//ns:FolderSync/ns:SyncKey")->item(0)->nodeValue);
	+
	+ if ($this->isStorageDriver('kolab4')) {
	+ // Note we expect Update here, not Add+Delete, folder ID does not change
	+ $this->assertSame('1', $xpath->query("//ns:FolderSync/ns:Changes/ns:Count")->item(0)->nodeValue);
	+ $this->assertSame($params['folders'][1], $xpath->query("//ns:FolderSync/ns:Changes/ns:Update/ns:ServerId")->item(0)->nodeValue);
	+ $this->assertSame('Test Contacts New', $xpath->query("//ns:FolderSync/ns:Changes/ns:Update/ns:DisplayName")->item(0)->nodeValue);
	+ $this->assertSame(strval($folderType), $xpath->query("//ns:FolderSync/ns:Changes/ns:Update/ns:Type")->item(0)->nodeValue);
	+ } else {
	+ // Note we expect Add+Delete here, instead of Update (but this could change in the future)
	+ $this->assertSame('2', $xpath->query("//ns:FolderSync/ns:Changes/ns:Count")->item(0)->nodeValue);
	+ $this->assertSame($params['folders'][1], $xpath->query("//ns:FolderSync/ns:Changes/ns:Delete/ns:ServerId")->item(0)->nodeValue);
	+ $this->assertSame('0', $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:ParentId")->item(0)->nodeValue);
	+ $this->assertSame('Test Contacts New', $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:DisplayName")->item(0)->nodeValue);
	+ $this->assertSame(strval($folderType), $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:Type")->item(0)->nodeValue);
	+ $params['folders'][1] = $xpath->query("//ns:FolderSync/ns:Changes/ns:Add/ns:ServerId")->item(0)->nodeValue;
	+ }
	+
	+ // TODO: Test folder with a parent change
	+ // TODO: Assert the folder name has changed in the storage
	+ // TODO: Test Sync after a DAV folder rename made in another client
	+
	+ return $params;
	+ }
	+
	+ /**
	+ * Test FolderDelete command
	+ *
	+ * @depends testFolderUpdate
	+ */
	+ public function testFolderDelete($params)
	+ {
	+ // Multi-folder mode
	+ self::$deviceType = 'iphone';
	+
	+ // Delete mail folder
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderDelete xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$params['SyncKey']}</SyncKey>
	+ <ServerId>{$params['folders'][0]}</ServerId>
	+ </FolderDelete>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderDelete');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderDelete/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params['SyncKey']), $xpath->query("//ns:FolderDelete/ns:SyncKey")->item(0)->nodeValue);
	+
	+ // Note: After FolderDelete there are no changes in the following FolderSync expected
	+
	+ // Delete contacts folder
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderDelete xmlns="uri:FolderHierarchy">
	+ <SyncKey>{$params['SyncKey']}</SyncKey>
	+ <ServerId>{$params['folders'][1]}</ServerId>
	+ </FolderDelete>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderDelete');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:FolderDelete/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params['SyncKey']), $xpath->query("//ns:FolderDelete/ns:SyncKey")->item(0)->nodeValue);
	+
	+ // Note: After FolderDelete there are no changes in the following FolderSync expected
	+
	+ // TODO: Assert the folders no longer exist
	+ }
	+}
	diff --git a/tests/Sync/ItemOperationsTest.php b/tests/Sync/ItemOperationsTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/ItemOperationsTest.php
	@@ -0,0 +1,81 @@
	+<?php
	+
	+class ItemOperationsTest extends Tests\SyncTestCase
	+{
	+ /**
	+ * Test ItemOperations::EmptyFolderContents request
	+ */
	+ public function testEmptyFolderContents()
	+ {
	+ $this->registerDevice();
	+
	+ // TODO: Test invalid folder ID
	+ $collectionId = 'AAAAAAAAAAAA';
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <ItemOperations xmlns="uri:ItemOperations" xmlns:AirSync="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase">
	+ <EmptyFolderContents>
	+ <AirSync:CollectionId>{$collectionId}</AirSync:CollectionId>
	+ <Options><DeleteSubFolders/></Options>
	+ </EmptyFolderContents>
	+ </ItemOperations>
	+ EOF;
	+
	+ $response = $this->request($request, 'ItemOperations');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:ItemOperations/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(
	+ strval(Syncroton_Exception_Status_ItemOperations::ITEM_SERVER_ERROR),
	+ $xpath->query("//ns:ItemOperations/ns:Response/ns:EmptyFolderContents/ns:Status")->item(0)->nodeValue
	+ );
	+ $this->assertSame(
	+ $collectionId,
	+ $xpath->query("//ns:ItemOperations/ns:Response/ns:EmptyFolderContents/AirSync:CollectionId")->item(0)->nodeValue
	+ );
	+
	+ // Test Trash folder
	+ $collectionId = array_search('Trash', $this->folders);
	+ $this->assertIsString($collectionId);
	+
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <ItemOperations xmlns="uri:ItemOperations" xmlns:AirSync="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase">
	+ <EmptyFolderContents>
	+ <AirSync:CollectionId>{$collectionId}</AirSync:CollectionId>
	+ <Options><DeleteSubFolders/></Options>
	+ </EmptyFolderContents>
	+ </ItemOperations>
	+ EOF;
	+
	+ $response = $this->request($request, 'ItemOperations');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:ItemOperations/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("//ns:ItemOperations/ns:Response/ns:EmptyFolderContents/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame($collectionId, $xpath->query("//ns:ItemOperations/ns:Response/ns:EmptyFolderContents/AirSync:CollectionId")->item(0)->nodeValue);
	+
	+ // TODO: Test DAV folder
	+ // TODO: Test a folder with subfolders
	+ // TODO: Test non-empty folder and assert that all objects are gone
	+ $this->markTestIncomplete();
	+ }
	+
	+ /**
	+ * Test ItemOperations::Fetch request
	+ */
	+ public function testFetch()
	+ {
	+ $this->markTestIncomplete();
	+ }
	+}
	diff --git a/tests/Sync/MeetingResponseTest.php b/tests/Sync/MeetingResponseTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/MeetingResponseTest.php
	@@ -0,0 +1,131 @@
	+<?php
	+
	+namespace Tests\Sync;
	+
	+class MeetingResponseTest extends \Tests\SyncTestCase
	+{
	+ /**
	+ * Test MeetingResponse command
	+ */
	+ public function testAcceptingInvitation()
	+ {
	+ $this->emptyTestFolder($davFolder = 'Calendar', 'event');
	+ $this->emptyTestFolder('INBOX', 'mail');
	+
	+ $this->registerDevice();
	+
	+ // Do the initial INBOX sync
	+ $folderId = '38b950ebd62cd9a66929c89615d0fc04'; // INBOX
	+ $syncKey = 0;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync">
	+ <Collections>
	+ <Collection>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>{$folderId}</CollectionId>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:Sync/ns:Collections/ns:Collection/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("//ns:Sync/ns:Collections/ns:Collection/ns:SyncKey")->item(0)->nodeValue);
	+
	+ // Append an invitation email, and sync it
	+ $sync = \kolab_sync::get_instance();
	+ $replace = [
	+ '$from' => 'test.test@domain.tld',
	+ '$to' => $sync->config->get('activesync_test_username'),
	+ ];
	+ $this->appendMail('INBOX', 'mail.itip1', $replace);
	+
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync">
	+ <Collections>
	+ <Collection>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>{$folderId}</CollectionId>
	+ <DeletesAsMoves>1</DeletesAsMoves>
	+ <GetChanges>1</GetChanges>
	+ <WindowSize>1</WindowSize>
	+ <Options>
	+ <FilterType>0</FilterType>
	+ <Conflict>1</Conflict>
	+ <BodyPreference xmlns="uri:AirSyncBase">
	+ <Type>2</Type>
	+ <TruncationSize>51200</TruncationSize>
	+ <AllOrNone>0</AllOrNone>
	+ </BodyPreference>
	+ </Options>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = $xpath->query("//ns:Sync/ns:Collections/ns:Collection")->item(0);
	+ $this->assertSame('1', $xpath->query("ns:Status", $root)->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("ns:SyncKey", $root)->item(0)->nodeValue);
	+ $this->assertSame(1, $xpath->query("ns:Commands/ns:Add", $root)->count());
	+
	+ $serverId = $xpath->query("ns:Commands/ns:Add/ns:ServerId", $root)->item(0)->nodeValue;
	+
	+ $root = $xpath->query("ns:Commands/ns:Add/ns:ApplicationData", $root)->item(0);
	+ $this->assertSame('You\'ve been invited to "Test"', $xpath->query("Email:Subject", $root)->item(0)->nodeValue);
	+ $this->assertSame('Organizer <test.test@domain.tld>', $xpath->query("Email:From", $root)->item(0)->nodeValue);
	+ $this->assertSame($replace['$to'], $xpath->query("Email:To", $root)->item(0)->nodeValue);
	+ $this->assertSame('0', $xpath->query("Email:Read", $root)->item(0)->nodeValue);
	+ $this->assertSame('IPM.Schedule.Meeting.Request', $xpath->query("Email:MessageClass", $root)->item(0)->nodeValue);
	+ $this->assertSame('urn:content-classes:calendarmessage', $xpath->query("Email:ContentClass", $root)->item(0)->nodeValue);
	+ $root = $xpath->query("Email:MeetingRequest", $root)->item(0);
	+ $this->assertSame('0', $xpath->query("Email:AllDayEvent", $root)->item(0)->nodeValue);
	+ $this->assertSame('2023-12-07T13:00:00.000Z', $xpath->query("Email:StartTime", $root)->item(0)->nodeValue);
	+ $this->assertSame('2023-12-07T13:30:00.000Z', $xpath->query("Email:EndTime", $root)->item(0)->nodeValue);
	+ $this->assertSame('test.test@domain.tld', $xpath->query("Email:Organizer", $root)->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("Email:ResponseRequested", $root)->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("Email:DisallowNewTimeProposal", $root)->item(0)->nodeValue);
	+
	+ // Accept the invitation
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <MeetingResponse xmlns="uri:MeetingResponse" xmlns:Search="uri:Search">
	+ <Request>
	+ <UserResponse>1</UserResponse>
	+ <CollectionId>{$folderId}</CollectionId>
	+ <RequestId>{$serverId}</RequestId>
	+ </Request>
	+ </MeetingResponse>
	+ EOF;
	+
	+ $response = $this->request($request, 'MeetingResponse');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+ $xpath->registerNamespace('MeetingResponse', 'uri:MeetingResponse');
	+
	+ $root = $xpath->query("//MeetingResponse:MeetingResponse/MeetingResponse:Result")->item(0);
	+ $this->assertSame('1', $xpath->query("ns:Status", $root)->item(0)->nodeValue);
	+ $this->assertSame($serverId, $xpath->query("ns:RequestId", $root)->item(0)->nodeValue);
	+ $this->assertStringMatchesFormat("CRC%s", $xpath->query("ns:CalendarId", $root)->item(0)->nodeValue);
	+ }
	+}
	diff --git a/tests/Sync/OptionsTest.php b/tests/Sync/OptionsTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/OptionsTest.php
	@@ -0,0 +1,16 @@
	+<?php
	+
	+class OptionsTest extends Tests\SyncTestCase
	+{
	+ /**
	+ * Test Options command/request
	+ */
	+ public function testOptions()
	+ {
	+ $response = self::$client->request('OPTIONS', '');
	+ $this->assertEquals(200, $response->getStatusCode());
	+ $this->assertStringContainsString('14', $response->getHeader('MS-Server-ActiveSync')[0]);
	+ $this->assertStringContainsString('14.1', $response->getHeader('MS-ASProtocolVersions')[0]);
	+ $this->assertStringContainsString('FolderSync', $response->getHeader('MS-ASProtocolCommands')[0]);
	+ }
	+}
	diff --git a/tests/Sync/ProvisionTest.php b/tests/Sync/ProvisionTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/ProvisionTest.php
	@@ -0,0 +1,45 @@
	+<?php
	+
	+class ProvisionTest extends Tests\SyncTestCase
	+{
	+ /**
	+ * Test Provision command
	+ */
	+ public function testProvision()
	+ {
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Provision xmlns="uri:Provision" xmlns:Settings="uri:Settings">
	+ <DeviceInformation xmlns="uri:Settings">
	+ <Set>
	+ <Model>moto e(6) plus</Model>
	+ <IMEI>000000000000000</IMEI>
	+ <FriendlyName>pokerp_reteu_64</FriendlyName>
	+ <OS>Android 9.58-8</OS>
	+ <OSLanguage>Polish (Poland)</OSLanguage>
	+ <MobileOperator/>
	+ </Set>
	+ </DeviceInformation>
	+ <Policies>
	+ <Policy>
	+ <PolicyType>MS-EAS-Provisioning-WBXML</PolicyType>
	+ </Policy>
	+ </Policies>
	+ </Provision>
	+ EOF;
	+
	+ $response = $this->request($request, 'Provision');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:Provision/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("//ns:Provision/Settings:DeviceInformation/Settings:Status")->item(0)->nodeValue);
	+ $this->assertSame('2', $xpath->query("//ns:Provision/ns:Policies/ns:Policy/ns:Status")->item(0)->nodeValue);
	+
	+ // TODO: Assert the properties have been set
	+ }
	+}
	diff --git a/tests/Sync/SettingsTest.php b/tests/Sync/SettingsTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/SettingsTest.php
	@@ -0,0 +1,80 @@
	+<?php
	+
	+class SettingsTest extends Tests\SyncTestCase
	+{
	+ /**
	+ * Test Settings command
	+ */
	+ public function testSettingsUserInformation()
	+ {
	+ // Test retrieving the settings
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Settings xmlns="uri:Settings">
	+ <UserInformation>
	+ <Get/>
	+ </UserInformation>
	+ </Settings>
	+ EOF;
	+
	+ $response = $this->request($request, 'Settings');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = self::fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:Settings/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("//ns:Settings/ns:UserInformation/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(
	+ self::$username,
	+ $xpath->query("//ns:Settings/ns:UserInformation/ns:Get/ns:Accounts/ns:Account/ns:EmailAddresses/ns:PrimarySmtpAddress")->item(0)->nodeValue
	+ );
	+ }
	+
	+ /**
	+ * Test Settings command
	+ */
	+ public function testSettingsDeviceInfomation()
	+ {
	+ // Test device info update
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Settings xmlns="uri:Settings">
	+ <DeviceInformation>
	+ <Set>
	+ <Model>moto plus</Model>
	+ <IMEI>111111111</IMEI>
	+ <FriendlyName>fn</FriendlyName>
	+ <OS>Android 10</OS>
	+ <OSLanguage>English</OSLanguage>
	+ <MobileOperator/>
	+ </Set>
	+ </DeviceInformation>
	+ </Settings>
	+ EOF;
	+
	+ $response = $this->request($request, 'Settings');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:Settings/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame('1', $xpath->query("//ns:Settings/ns:DeviceInformation/ns:Set/ns:Status")->item(0)->nodeValue);
	+
	+ // TODO: Assert the properties have been set
	+ }
	+
	+ /**
	+ * Test Settings command regarding OOF
	+ */
	+ public function testSettingsOOF()
	+ {
	+ // TODO: Test OOF settings
	+ $this->markTestIncomplete();
	+ }
	+}
	diff --git a/tests/Sync/Sync/CalendarTest.php b/tests/Sync/Sync/CalendarTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/Sync/CalendarTest.php
	@@ -0,0 +1,75 @@
	+<?php
	+
	+namespace Tests\Sync\Sync;
	+
	+class CalendarTest extends \Tests\SyncTestCase
	+{
	+ /**
	+ * Test Sync command
	+ */
	+ public function testSync()
	+ {
	+ $this->emptyTestFolder($davFolder = 'Calendar', 'event');
	+ $this->registerDevice();
	+
	+ // Test empty folder
	+ $folderId = 'Calendar::Syncroton';
	+ $syncKey = 0;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase">
	+ <Collections>
	+ <Collection>
	+ <Class>Calendar</Class>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>{$folderId}</CollectionId>
	+ <DeletesAsMoves/>
	+ <GetChanges/>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = "//ns:Sync/ns:Collections/ns:Collection";
	+ $this->assertSame('1', $xpath->query("{$root}/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("{$root}/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame($folderId, $xpath->query("{$root}/ns:CollectionId")->item(0)->nodeValue);
	+ $this->assertSame(0, $xpath->query("{$root}/ns:Commands/ns:Add")->count());
	+
	+ // Append two event objects and sync them
	+ $this->appendObject($davFolder, 'event.ics1', 'event');
	+ $this->appendObject($davFolder, 'event.ics2', 'event');
	+
	+ $request = str_replace("<SyncKey>0</SyncKey>", "<SyncKey>{$syncKey}</SyncKey>", $request);
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = "//ns:Sync/ns:Collections/ns:Collection";
	+ $this->assertSame('1', $xpath->query("{$root}/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("{$root}/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame($folderId, $xpath->query("{$root}/ns:CollectionId")->item(0)->nodeValue);
	+ $this->assertSame(2, $xpath->query("{$root}/ns:Commands/ns:Add")->count());
	+
	+ $root .= "/ns:Commands/ns:Add";
	+ $this->assertStringMatchesFormat("CRC%s", $xpath->query("{$root}/ns:ServerId")->item(0)->nodeValue);
	+ $this->assertSame('20240715T170000Z', $xpath->query("{$root}/ns:ApplicationData/Calendar:StartTime")->item(0)->nodeValue);
	+ $this->assertSame('Meeting', $xpath->query("{$root}/ns:ApplicationData/Calendar:Subject")->item(0)->nodeValue);
	+ $this->assertSame('20240714T170000Z', $xpath->query("{$root}/ns:ApplicationData/Calendar:StartTime")->item(1)->nodeValue);
	+ $this->assertSame('Party', $xpath->query("{$root}/ns:ApplicationData/Calendar:Subject")->item(1)->nodeValue);
	+
	+ return $syncKey;
	+ }
	+}
	diff --git a/tests/Sync/Sync/ContactsTest.php b/tests/Sync/Sync/ContactsTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/Sync/ContactsTest.php
	@@ -0,0 +1,249 @@
	+<?php
	+
	+namespace Tests\Sync\Sync;
	+
	+class ContactsTest extends \Tests\SyncTestCase
	+{
	+ /**
	+ * Test Sync command
	+ */
	+ public function testSync()
	+ {
	+ $davFolder = $this->isStorageDriver('kolab') ? 'Contacts' : 'Addressbook';
	+ $this->emptyTestFolder($davFolder, 'contact');
	+ $this->registerDevice();
	+
	+ // Test empty contacts folder
	+ $folderId = 'Contacts::Syncroton';
	+ $syncKey = 0;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase">
	+ <Collections>
	+ <Collection>
	+ <Class>Contacts</Class>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>{$folderId}</CollectionId>
	+ <DeletesAsMoves/>
	+ <GetChanges/>
	+ <Options>
	+ <AirSyncBase:BodyPreference>
	+ <AirSyncBase:Type>1</AirSyncBase:Type>
	+ <AirSyncBase:TruncationSize>5120</AirSyncBase:TruncationSize>
	+ </AirSyncBase:BodyPreference>
	+ <Conflict>1</Conflict>
	+ </Options>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = "//ns:Sync/ns:Collections/ns:Collection";
	+ $this->assertSame('1', $xpath->query("{$root}/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("{$root}/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame($folderId, $xpath->query("{$root}/ns:CollectionId")->item(0)->nodeValue);
	+ $this->assertSame(0, $xpath->query("{$root}/ns:Commands/ns:Add")->count());
	+
	+ // Append two contact objects and sync them
	+ // TODO: Test a folder with contact groups inside
	+ $this->appendObject($davFolder, 'contact.vcard1', 'contact');
	+ $this->appendObject($davFolder, 'contact.vcard2', 'contact');
	+
	+ $request = str_replace("<SyncKey>0</SyncKey>", "<SyncKey>{$syncKey}</SyncKey>", $request);
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = "//ns:Sync/ns:Collections/ns:Collection";
	+ $this->assertSame('1', $xpath->query("{$root}/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("{$root}/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame($folderId, $xpath->query("{$root}/ns:CollectionId")->item(0)->nodeValue);
	+ $this->assertSame(2, $xpath->query("{$root}/ns:Commands/ns:Add")->count());
	+
	+ $root .= "/ns:Commands/ns:Add";
	+ $this->assertStringMatchesFormat("CRC%s", $xpath->query("{$root}/ns:ServerId")->item(0)->nodeValue);
	+ $this->assertSame('Jack', $xpath->query("{$root}/ns:ApplicationData/Contacts:FirstName")->item(0)->nodeValue);
	+ $this->assertSame('Strong', $xpath->query("{$root}/ns:ApplicationData/Contacts:LastName")->item(0)->nodeValue);
	+ $this->assertSame('Jane', $xpath->query("{$root}/ns:ApplicationData/Contacts:FirstName")->item(1)->nodeValue);
	+ $this->assertSame('Doe', $xpath->query("{$root}/ns:ApplicationData/Contacts:LastName")->item(1)->nodeValue);
	+
	+ return $syncKey;
	+ }
	+
	+ /**
	+ * Test adding objects from client
	+ *
	+ * @depends testSync
	+ */
	+ public function testAddFromClient($syncKey)
	+ {
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase" xmlns:Contacts="uri:Contacts">
	+ <Collections>
	+ <Collection>
	+ <Class>Contacts</Class>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>Contacts::Syncroton</CollectionId>
	+ <DeletesAsMoves/>
	+ <GetChanges/>
	+ <Options>
	+ <AirSyncBase:BodyPreference>
	+ <AirSyncBase:Type>1</AirSyncBase:Type>
	+ <AirSyncBase:TruncationSize>5120</AirSyncBase:TruncationSize>
	+ </AirSyncBase:BodyPreference>
	+ <Conflict>1</Conflict>
	+ </Options>
	+ <Commands>
	+ <Add>
	+ <ClientId>42</ClientId>
	+ <ApplicationData>
	+ <Contacts:FirstName>Lars</Contacts:FirstName>
	+ </ApplicationData>
	+ </Add>
	+ </Commands>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = $xpath->query("//ns:Sync/ns:Collections/ns:Collection")->item(0);
	+ $this->assertSame('1', $xpath->query("ns:Status", $root)->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("ns:SyncKey", $root)->item(0)->nodeValue);
	+ $root = $xpath->query("ns:Responses/ns:Add", $root)->item(0);
	+ $this->assertSame('1', $xpath->query("ns:Status", $root)->item(0)->nodeValue);
	+ $this->assertSame('42', $xpath->query("ns:ClientId", $root)->item(0)->nodeValue);
	+ $serverId = $xpath->query("ns:ServerId", $root)->item(0)->nodeValue;
	+ $this->assertStringMatchesFormat("CRC%s", $serverId);
	+
	+ // TODO: Test the content on the server
	+
	+ return [$syncKey, $serverId];
	+ }
	+
	+ /**
	+ * Test updating objects from client
	+ *
	+ * @depends testAddFromClient
	+ */
	+ public function testChangeFromClient($params)
	+ {
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase" xmlns:Contacts="uri:Contacts">
	+ <Collections>
	+ <Collection>
	+ <Class>Contacts</Class>
	+ <SyncKey>{$params[0]}</SyncKey>
	+ <CollectionId>Contacts::Syncroton</CollectionId>
	+ <DeletesAsMoves/>
	+ <GetChanges/>
	+ <Options>
	+ <AirSyncBase:BodyPreference>
	+ <AirSyncBase:Type>1</AirSyncBase:Type>
	+ <AirSyncBase:TruncationSize>5120</AirSyncBase:TruncationSize>
	+ </AirSyncBase:BodyPreference>
	+ <Conflict>1</Conflict>
	+ </Options>
	+ <Commands>
	+ <Change>
	+ <ServerId>{$params[1]}</ServerId>
	+ <ApplicationData>
	+ <Contacts:FirstName>First</Contacts:FirstName>
	+ <Contacts:LastName>Last</Contacts:LastName>
	+ </ApplicationData>
	+ </Change>
	+ </Commands>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = $xpath->query("//ns:Sync/ns:Collections/ns:Collection")->item(0);
	+ $this->assertSame('1', $xpath->query("ns:Status", $root)->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params[0]), $xpath->query("ns:SyncKey", $root)->item(0)->nodeValue);
	+ $this->assertSame(0, $xpath->query("ns:Responses", $root)->length);
	+
	+ // TODO: Assert updated content on the server
	+
	+ return $params;
	+ }
	+
	+ /**
	+ * Test deleting objects from client
	+ *
	+ * @depends testChangeFromClient
	+ */
	+ public function testDeleteFromClient($params)
	+ {
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase" xmlns:Contacts="uri:Contacts">
	+ <Collections>
	+ <Collection>
	+ <Class>Contacts</Class>
	+ <SyncKey>{$params[0]}</SyncKey>
	+ <CollectionId>Contacts::Syncroton</CollectionId>
	+ <DeletesAsMoves/>
	+ <GetChanges/>
	+ <Options>
	+ <AirSyncBase:BodyPreference>
	+ <AirSyncBase:Type>1</AirSyncBase:Type>
	+ <AirSyncBase:TruncationSize>5120</AirSyncBase:TruncationSize>
	+ </AirSyncBase:BodyPreference>
	+ <Conflict>1</Conflict>
	+ </Options>
	+ <Commands>
	+ <Delete>
	+ <ServerId>{$params[1]}</ServerId>
	+ </Delete>
	+ </Commands>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = $xpath->query("//ns:Sync/ns:Collections/ns:Collection")->item(0);
	+ $this->assertSame('1', $xpath->query("ns:Status", $root)->item(0)->nodeValue);
	+ $this->assertSame(strval(++$params[0]), $xpath->query("ns:SyncKey", $root)->item(0)->nodeValue);
	+ $this->assertSame(0, $xpath->query("ns:Responses", $root)->length);
	+
	+ // TODO: Assert deleted contact on the server
	+ }
	+}
	diff --git a/tests/Sync/Sync/EmailTest.php b/tests/Sync/Sync/EmailTest.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/Sync/Sync/EmailTest.php
	@@ -0,0 +1,181 @@
	+<?php
	+
	+namespace Tests\Sync\Sync;
	+
	+class EmailTest extends \Tests\SyncTestCase
	+{
	+ /**
	+ * Test Sync command
	+ */
	+ public function testSync()
	+ {
	+ $this->emptyTestFolder('INBOX', 'mail');
	+ $this->registerDevice();
	+
	+ // Test invalid collection identifier
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync">
	+ <Collections>
	+ <Collection>
	+ <SyncKey>0</SyncKey>
	+ <CollectionId>1111111111</CollectionId>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('12', $xpath->query("//ns:Sync/ns:Status")->item(0)->nodeValue);
	+
	+ // Test INBOX
	+ $folderId = '38b950ebd62cd9a66929c89615d0fc04';
	+ $syncKey = 0;
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync">
	+ <Collections>
	+ <Collection>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>{$folderId}</CollectionId>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $this->assertSame('1', $xpath->query("//ns:Sync/ns:Collections/ns:Collection/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("//ns:Sync/ns:Collections/ns:Collection/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame('Email', $xpath->query("//ns:Sync/ns:Collections/ns:Collection/ns:Class")->item(0)->nodeValue);
	+ $this->assertSame($folderId, $xpath->query("//ns:Sync/ns:Collections/ns:Collection/ns:CollectionId")->item(0)->nodeValue);
	+
	+ // Test listing mail in INBOX, use WindowSize=1
	+ // Append two mail messages
	+ $this->appendMail('INBOX', 'mail.sync1');
	+ $this->appendMail('INBOX', 'mail.sync2');
	+
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase">
	+ <Collections>
	+ <Collection>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>{$folderId}</CollectionId>
	+ <DeletesAsMoves>1</DeletesAsMoves>
	+ <GetChanges>1</GetChanges>
	+ <WindowSize>1</WindowSize>
	+ <Options>
	+ <FilterType>0</FilterType>
	+ <Conflict>1</Conflict>
	+ <BodyPreference xmlns="uri:AirSyncBase">
	+ <Type>2</Type>
	+ <TruncationSize>51200</TruncationSize>
	+ <AllOrNone>0</AllOrNone>
	+ </BodyPreference>
	+ </Options>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = "//ns:Sync/ns:Collections/ns:Collection";
	+ $this->assertSame('1', $xpath->query("{$root}/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("{$root}/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame($folderId, $xpath->query("{$root}/ns:CollectionId")->item(0)->nodeValue);
	+ $this->assertSame(1, $xpath->query("{$root}/ns:Commands/ns:Add")->count());
	+
	+ // Note: We assume messages are in IMAP default order, it may change in future
	+ $root .= "/ns:Commands/ns:Add";
	+ $this->assertStringMatchesFormat("{$folderId}::%d", $xpath->query("{$root}/ns:ServerId")->item(0)->nodeValue);
	+ $this->assertSame('test sync', $xpath->query("{$root}/ns:ApplicationData/Email:Subject")->item(0)->nodeValue);
	+
	+ // List the rest of the mail
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <Sync xmlns="uri:AirSync" xmlns:AirSyncBase="uri:AirSyncBase">
	+ <Collections>
	+ <Collection>
	+ <SyncKey>{$syncKey}</SyncKey>
	+ <CollectionId>{$folderId}</CollectionId>
	+ <DeletesAsMoves>1</DeletesAsMoves>
	+ <GetChanges>1</GetChanges>
	+ <Options>
	+ <FilterType>0</FilterType>
	+ <Conflict>1</Conflict>
	+ <BodyPreference xmlns="uri:AirSyncBase">
	+ <Type>2</Type>
	+ <TruncationSize>51200</TruncationSize>
	+ <AllOrNone>0</AllOrNone>
	+ </BodyPreference>
	+ </Options>
	+ </Collection>
	+ </Collections>
	+ </Sync>
	+ EOF;
	+
	+ $response = $this->request($request, 'Sync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ $root = "//ns:Sync/ns:Collections/ns:Collection";
	+ $this->assertSame('1', $xpath->query("{$root}/ns:Status")->item(0)->nodeValue);
	+ $this->assertSame(strval(++$syncKey), $xpath->query("{$root}/ns:SyncKey")->item(0)->nodeValue);
	+ $this->assertSame($folderId, $xpath->query("{$root}/ns:CollectionId")->item(0)->nodeValue);
	+ $this->assertSame(1, $xpath->query("{$root}/ns:Commands/ns:Add")->count());
	+
	+ // Note: We assume messages are in IMAP default order, it may change in future
	+ $root .= "/ns:Commands/ns:Add";
	+ $this->assertStringMatchesFormat("{$folderId}::%d", $xpath->query("{$root}/ns:ServerId")->item(0)->nodeValue);
	+ $this->assertSame('sync test with attachment', $xpath->query("{$root}/ns:ApplicationData/Email:Subject")->item(0)->nodeValue);
	+
	+ return $syncKey;
	+ }
	+
	+ /**
	+ * Test updating message properties from client
	+ *
	+ * @depends testSync
	+ */
	+ public function testChangeFromClient($syncKey)
	+ {
	+ $this->markTestIncomplete();
	+
	+ return $syncKey;
	+ }
	+
	+ /**
	+ * Test deleting messages from client
	+ *
	+ * @depends testChangeFromClient
	+ */
	+ public function testDeleteFromClient($syncKey)
	+ {
	+ $this->markTestIncomplete();
	+ }
	+}
	diff --git a/tests/SyncTestCase.php b/tests/SyncTestCase.php
	new file mode 100644
	--- /dev/null
	+++ b/tests/SyncTestCase.php
	@@ -0,0 +1,360 @@
	+<?php
	+
	+namespace Tests;
	+
	+class SyncTestCase extends \PHPUnit\Framework\TestCase
	+{
	+ protected static ?\GuzzleHttp\Client $client;
	+ protected static ?string $deviceId;
	+ protected static ?string $deviceType;
	+ protected static ?string $username;
	+ protected static ?string $password;
	+ protected static bool $authenticated = false;
	+
	+ protected array $folders = [];
	+
	+ /**
	+ * {@inheritDoc}
	+ */
	+ public function setUp(): void
	+ {
	+ if (empty(self::$username)) {
	+ $this->markTestSkipped('Not setup');
	+ }
	+
	+ self::$deviceType = null;
	+ }
	+
	+ /**
	+ * {@inheritDoc}
	+ */
	+ public static function setUpBeforeClass(): void
	+ {
	+ $sync = \kolab_sync::get_instance();
	+ $config = $sync->config;
	+ $db = $sync->get_dbh();
	+
	+ self::$username = $config->get('activesync_test_username');
	+ self::$password = $config->get('activesync_test_password');
	+
	+ if (empty(self::$username)) {
	+ return;
	+ }
	+
	+ self::$deviceId = 'test' . time();
	+
	+ $db->query('DELETE FROM syncroton_device');
	+ $db->query('DELETE FROM syncroton_synckey');
	+ $db->query('DELETE FROM syncroton_folder');
	+ $db->query('DELETE FROM syncroton_data');
	+ $db->query('DELETE FROM syncroton_data_folder');
	+ $db->query('DELETE FROM syncroton_modseq');
	+ $db->query('DELETE FROM syncroton_content');
	+
	+ self::$client = new \GuzzleHttp\Client([
	+ 'http_errors' => false,
	+ 'base_uri' => 'http://localhost:8000',
	+ 'verify' => false,
	+ 'auth' => [self::$username, self::$password],
	+ 'connect_timeout' => 10,
	+ 'timeout' => 10,
	+ 'headers' => [
	+ 'Content-Type' => 'application/xml; charset=utf-8',
	+ 'Depth' => '1',
	+ ]
	+ ]);
	+
	+ // TODO: execute: php -S localhost:8000
	+ }
	+
	+ /**
	+ * {@inheritDoc}
	+ */
	+ public static function tearDownAfterClass(): void
	+ {
	+ if (self::$deviceId) {
	+ $sync = \kolab_sync::get_instance();
	+
	+ if (self::$authenticated \|\| $sync->authenticate(self::$username, self::$password)) {
	+ $sync->password = self::$password;
	+
	+ $storage = $sync->storage();
	+ $storage->device_delete(self::$deviceId);
	+ }
	+
	+ $db = $sync->get_dbh();
	+ $db->query('DELETE FROM syncroton_device');
	+ $db->query('DELETE FROM syncroton_synckey');
	+ $db->query('DELETE FROM syncroton_folder');
	+ }
	+ }
	+
	+ /**
	+ * Append an email message to the IMAP folder
	+ */
	+ protected function appendMail($folder, $filename, $replace = [])
	+ {
	+ $imap = $this->getImapStorage();
	+
	+ $source = __DIR__ . '/src/' . $filename;
	+
	+ if (!file_exists($source)) {
	+ exit("File does not exist: {$source}");
	+ }
	+
	+ $is_file = true;
	+
	+ if (!empty($replace)) {
	+ $is_file = false;
	+ $source = file_get_contents($source);
	+ foreach ($replace as $token => $value) {
	+ $source = str_replace($token, $value, $source);
	+ }
	+ }
	+
	+ $result = $imap->save_message($folder, $source, '', $is_file);
	+
	+ if ($result === false) {
	+ exit("Failed to append mail into {$folder}");
	+ }
	+ }
	+
	+ /**
	+ * Append an DAV object to a DAV/IMAP folder
	+ */
	+ protected function appendObject($foldername, $filename, $type)
	+ {
	+ $path = __DIR__ . '/src/' . $filename;
	+
	+ if (!file_exists($path)) {
	+ exit("File does not exist: {$path}");
	+ }
	+
	+ $content = file_get_contents($path);
	+ $uid = preg_match('/UID:(?:urn:uuid:)?([a-z0-9-]+)/', $content, $m) ? $m[1] : null;
	+
	+ if (empty($uid)) {
	+ exit("Filed to find UID in {$path}");
	+ }
	+
	+ if ($this->isStorageDriver('kolab')) {
	+ $imap = $this->getImapStorage();
	+ if ($imap->folder_exists($foldername)) {
	+ // TODO
	+ exit("Not implemented for Kolab v3 storage driver");
	+ }
	+
	+ return;
	+ }
	+
	+ $dav = $this->getDavStorage();
	+
	+ foreach ($dav->get_folders($type) as $folder) {
	+ if ($folder->get_name() === $foldername) {
	+ $dav_type = $folder->get_dav_type();
	+ $location = $folder->object_location($uid);
	+
	+ if ($folder->dav->create($location, $content, $dav_type) !== false) {
	+ return;
	+ }
	+ }
	+ }
	+
	+ exit("Failed to append object into {$folder}");
	+ }
	+
	+ /**
	+ * Delete a folder
	+ */
	+ protected function deleteTestFolder($name, $type)
	+ {
	+ // Deleting IMAP folders
	+ if ($type == 'mail' \|\| $this->isStorageDriver('kolab')) {
	+ $imap = $this->getImapStorage();
	+ if ($imap->folder_exists($name)) {
	+ $imap->delete_folder($name);
	+ }
	+
	+ return;
	+ }
	+
	+ // Deleting DAV folders
	+ $dav = $this->getDavStorage();
	+
	+ foreach ($dav->get_folders($type) as $folder) {
	+ if ($folder->get_name() === $name) {
	+ $dav->folder_delete($folder->id, $type);
	+ }
	+ }
	+ }
	+
	+ /**
	+ * Remove all objects from a folder
	+ */
	+ protected function emptyTestFolder($name, $type)
	+ {
	+ // Deleting in IMAP folders
	+ if ($type == 'mail' \|\| $this->isStorageDriver('kolab')) {
	+ $imap = $this->getImapStorage();
	+ $imap->delete_message('*', $name);
	+ return;
	+ }
	+
	+ // Deleting in DAV folders
	+ $dav = $this->getDavStorage();
	+
	+ foreach ($dav->get_folders($type) as $folder) {
	+ if ($folder->get_name() === $name) {
	+ $folder->delete_all();
	+ }
	+ }
	+ }
	+
	+ /**
	+ * Convert WBXML binary content into XML
	+ */
	+ protected function fromWbxml($binary)
	+ {
	+ $stream = fopen('php://memory', 'r+');
	+ fwrite($stream, $binary);
	+ rewind($stream);
	+ $decoder = new \Syncroton_Wbxml_Decoder($stream);
	+
	+ return $decoder->decode();
	+ }
	+
	+ /**
	+ * Initialize DAV storage
	+ */
	+ protected function getDavStorage()
	+ {
	+ $sync = \kolab_sync::get_instance();
	+ $url = $sync->config->get('activesync_dav_server', 'http://localhost');
	+
	+ if (strpos($url, '://') === false) {
	+ $url = 'http://' . $url;
	+ }
	+
	+ // Inject user+password to the URL, there's no other way to pass it to the DAV client
	+ $url = str_replace('://', '://' . rawurlencode(self::$username) . ':' . rawurlencode(self::$password) . '@', $url);
	+
	+ // Make sure user is authenticated
	+ $this->getImapStorage();
	+ if ($sync->user) {
	+ // required e.g. for DAV client cache use
	+ \rcube::get_instance()->user = $sync->user;
	+ }
	+
	+ return new \kolab_storage_dav($url);
	+ }
	+
	+ /**
	+ * Initialize IMAP storage
	+ */
	+ protected function getImapStorage()
	+ {
	+ $sync = \kolab_sync::get_instance();
	+
	+ if (!self::$authenticated) {
	+ if ($sync->authenticate(self::$username, self::$password)) {
	+ self::$authenticated = true;
	+ $sync->password = self::$password;
	+ }
	+ }
	+
	+ return $sync->get_storage();
	+ }
	+
	+ /**
	+ * Check the configured activesync_storage driver
	+ */
	+ protected function isStorageDriver($name)
	+ {
	+ return $name === \kolab_sync::get_instance()->config->get('activesync_storage', 'kolab');
	+ }
	+
	+ /**
	+ * Make a HTTP request to the ActiveSync server
	+ */
	+ protected function request($body, $cmd, $type = 'POST')
	+ {
	+ $username = self::$username;
	+ $deviceId = self::$deviceId;
	+ $deviceType = self::$deviceType ?: 'WindowsOutlook15';
	+
	+ $body = $this->toWbxml($body);
	+
	+ return self::$client->request(
	+ $type,
	+ "?Cmd={$cmd}&User={$username}&DeviceId={$deviceId}&DeviceType={$deviceType}",
	+ [
	+ 'headers' => [
	+ 'Content-Type' => 'application/vnd.ms-sync.wbxml',
	+ 'MS-ASProtocolVersion' => '14.0'
	+ ],
	+ 'body' => $body,
	+ ]
	+ );
	+ }
	+
	+ /**
	+ * Register the device for tests, some commands do not work until device/folders are registered
	+ */
	+ protected function registerDevice()
	+ {
	+ // Execute initial FolderSync, it is required before executing some commands
	+ $request = <<<EOF
	+ <?xml version="1.0" encoding="utf-8"?>
	+ <!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">
	+ <FolderSync xmlns="uri:FolderHierarchy">
	+ <SyncKey>0</SyncKey>
	+ </FolderSync>
	+ EOF;
	+
	+ $response = $this->request($request, 'FolderSync');
	+
	+ $this->assertEquals(200, $response->getStatusCode());
	+
	+ $dom = $this->fromWbxml($response->getBody());
	+ $xpath = $this->xpath($dom);
	+
	+ foreach ($xpath->query("//ns:FolderSync/ns:Changes/ns:Add") as $idx => $folder) {
	+ $serverId = $folder->getElementsByTagName('ServerId')->item(0)->nodeValue;
	+ $displayName = $folder->getElementsByTagName('DisplayName')->item(0)->nodeValue;
	+ $this->folders[$serverId] = $displayName;
	+ }
	+ }
	+
	+ /**
	+ * Convert XML into WBXML binary content
	+ */
	+ protected function toWbxml($xml)
	+ {
	+ $outputStream = fopen('php://temp', 'r+');
	+ $encoder = new \Syncroton_Wbxml_Encoder($outputStream, 'UTF-8', 3);
	+ $dom = new \DOMDocument();
	+ $dom->loadXML($xml);
	+ $encoder->encode($dom);
	+ rewind($outputStream);
	+
	+ return stream_get_contents($outputStream);
	+ }
	+
	+ /**
	+ * Get XPath from a DOM
	+ */
	+ protected function xpath($dom)
	+ {
	+ $xpath = new \DOMXpath($dom);
	+ $xpath->registerNamespace("ns", $dom->documentElement->namespaceURI);
	+ $xpath->registerNamespace("AirSync", "uri:AirSync");
	+ $xpath->registerNamespace("Calendar", "uri:Calendar");
	+ $xpath->registerNamespace("Contacts", "uri:Contacts");
	+ $xpath->registerNamespace("Email", "uri:Email");
	+ $xpath->registerNamespace("Email2", "uri:Email2");
	+ $xpath->registerNamespace("Settings", "uri:Settings");
	+ $xpath->registerNamespace("Tasks", "uri:Tasks");
	+
	+ return $xpath;
	+ }
	+}
	diff --git a/tests/body_converter.php b/tests/Unit/BodyConverterTest.php
	rename from tests/body_converter.php
	rename to tests/Unit/BodyConverterTest.php
	--- a/tests/body_converter.php
	+++ b/tests/Unit/BodyConverterTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class body_converter extends PHPUnit\Framework\TestCase
	+class BodyConverterTest extends PHPUnit\Framework\TestCase
	{
	function data_html_to_text()
	{
	diff --git a/tests/data_calendar.php b/tests/Unit/DataCalendarTest.php
	rename from tests/data_calendar.php
	rename to tests/Unit/DataCalendarTest.php
	--- a/tests/data_calendar.php
	+++ b/tests/Unit/DataCalendarTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class data_calendar extends PHPUnit\Framework\TestCase
	+class DataCalendarTest extends PHPUnit\Framework\TestCase
	{
	/**
	* Test for kolab_sync_data_calendar::from_kolab_alarm()
	diff --git a/tests/globalid_converter.php b/tests/Unit/DataEmailTest.php
	rename from tests/globalid_converter.php
	rename to tests/Unit/DataEmailTest.php
	--- a/tests/globalid_converter.php
	+++ b/tests/Unit/DataEmailTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class globalid_converter extends PHPUnit\Framework\TestCase
	+class DataEmailTest extends PHPUnit\Framework\TestCase
	{
	/**
	* Test GlobalObjId encoding/decoding
	diff --git a/tests/data_tasks.php b/tests/Unit/DataTasksTest.php
	rename from tests/data_tasks.php
	rename to tests/Unit/DataTasksTest.php
	--- a/tests/data_tasks.php
	+++ b/tests/Unit/DataTasksTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class data_tasks extends PHPUnit\Framework\TestCase
	+class DataTasksTest extends PHPUnit\Framework\TestCase
	{
	function data_prio()
	{
	diff --git a/tests/data.php b/tests/Unit/DataTest.php
	rename from tests/data.php
	rename to tests/Unit/DataTest.php
	--- a/tests/data.php
	+++ b/tests/Unit/DataTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class data extends PHPUnit\Framework\TestCase
	+class DataTest extends PHPUnit\Framework\TestCase
	{
	/**
	* Test for kolab_sync_data::recurrence_to_kolab()
	diff --git a/tests/message.php b/tests/Unit/MessageTest.php
	rename from tests/message.php
	rename to tests/Unit/MessageTest.php
	--- a/tests/message.php
	+++ b/tests/Unit/MessageTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class message extends PHPUnit\Framework\TestCase
	+class MessageTest extends PHPUnit\Framework\TestCase
	{
	/**
	* Test message parsing and headers setting
	diff --git a/tests/timezone_converter.php b/tests/Unit/TimezoneConverterTest.php
	rename from tests/timezone_converter.php
	rename to tests/Unit/TimezoneConverterTest.php
	--- a/tests/timezone_converter.php
	+++ b/tests/Unit/TimezoneConverterTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class timezone_converter extends PHPUnit\Framework\TestCase
	+class TimezoneConverterTest extends PHPUnit\Framework\TestCase
	{
	function test_list_timezones()
	{
	diff --git a/tests/wbxml.php b/tests/Unit/WbxmlTest.php
	rename from tests/wbxml.php
	rename to tests/Unit/WbxmlTest.php
	--- a/tests/wbxml.php
	+++ b/tests/Unit/WbxmlTest.php
	@@ -1,6 +1,6 @@
	<?php

	-class wbxml extends PHPUnit\Framework\TestCase
	+class WbxmlTest extends PHPUnit\Framework\TestCase
	{
	//function testDecode()
	//{
	@@ -888,5 +888,23 @@

	$this->assertTrue($end - $start < 0.05);
	}
	+
	+ public function testDecoder()
	+ {
	+ $inputStream = fopen("php://memory", 'r+');
	+ $input = "\x03\x01j\x00\x00\x07VR\x030\x00\x01\x01";
	+ fwrite($inputStream, $input);
	+ rewind($inputStream);
	+
	+ $decoder = new Syncroton_Wbxml_Decoder($inputStream);
	+ $dom = $decoder->decode();
	+ $xml = $dom->saveXML();
	+
	+ $expected = '<?xml version="1.0" encoding="utf-8"?>'
	+ . '<!DOCTYPE AirSync PUBLIC "-//AIRSYNC//DTD AirSync//EN" "http://www.microsoft.com/">'
	+ . '<FolderSync xmlns="uri:FolderHierarchy"><SyncKey>0</SyncKey></FolderSync>';
	+
	+ $this->assertSame($expected, str_replace("\n", '', $xml));
	+ }
	}

	diff --git a/tests/bootstrap.php b/tests/bootstrap.php
	--- a/tests/bootstrap.php
	+++ b/tests/bootstrap.php
	@@ -1,5 +1,8 @@
	<?php

	+error_reporting(E_ALL);
	+ini_set('display_errors', 1);
	+
	if (php_sapi_name() != 'cli') {
	die("Not in shell mode (php-cli)");
	}
	@@ -7,5 +10,6 @@
	define('TESTS_DIR', dirname(__FILE__) . '/');

	require_once(TESTS_DIR . '/../lib/init.php');
	+require_once(TESTS_DIR . '/SyncTestCase.php');

	rcube::get_instance()->config->set('devel_mode', false);
	diff --git a/tests/phpunit.xml b/tests/phpunit.xml
	--- a/tests/phpunit.xml
	+++ b/tests/phpunit.xml
	@@ -2,15 +2,11 @@
	bootstrap="bootstrap.php"
	colors="true">
	<testsuites>
	- <testsuite name="All Tests">
	- <file>body_converter.php</file>
	- <file>data.php</file>
	- <file>data_calendar.php</file>
	- <file>data_tasks.php</file>
	- <file>globalid_converter.php</file>
	- <file>message.php</file>
	- <file>timezone_converter.php</file>
	- <file>wbxml.php</file>
	+ <testsuite name="Unit">
	+ <directory suffix="Test.php">Unit</directory>
	+ </testsuite>
	+ <testsuite name="Sync">
	+ <directory suffix="Test.php">Sync</directory>
	</testsuite>
	</testsuites>
	</phpunit>
	diff --git a/tests/src/contact.vcard1 b/tests/src/contact.vcard1
	new file mode 100644
	--- /dev/null
	+++ b/tests/src/contact.vcard1
	@@ -0,0 +1,6 @@
	+BEGIN:VCARD
	+VERSION:3.0
	+UID:urn:uuid:abcdef-0123-4567-89ab-abcdefabcdef
	+FN:Jane Doe
	+N:Doe;Jane;J.;;
	+END:VCARD
	diff --git a/tests/src/contact.vcard2 b/tests/src/contact.vcard2
	new file mode 100644
	--- /dev/null
	+++ b/tests/src/contact.vcard2
	@@ -0,0 +1,6 @@
	+BEGIN:VCARD
	+VERSION:3.0
	+UID:urn:uuid:abcdef-0123-4567-89ab-abcdefabc123
	+FN:Jack Strong
	+N:Strong;Jack;;;
	+END:VCARD
	diff --git a/tests/src/event.ics1 b/tests/src/event.ics1
	new file mode 100644
	--- /dev/null
	+++ b/tests/src/event.ics1
	@@ -0,0 +1,12 @@
	+BEGIN:VCALENDAR
	+VERSION:2.0
	+PRODID:-//test/test//NONSGML v1.0//EN
	+BEGIN:VEVENT
	+UID:abcdef
	+DTSTAMP:19970714T170000Z
	+ORGANIZER;CN=John Doe:MAILTO:john.doe@example.com
	+DTSTART:20240714T170000Z
	+DTEND:20240714T180000Z
	+SUMMARY:Party
	+END:VEVENT
	+END:VCALENDAR
	diff --git a/tests/src/event.ics2 b/tests/src/event.ics2
	new file mode 100644
	--- /dev/null
	+++ b/tests/src/event.ics2
	@@ -0,0 +1,12 @@
	+BEGIN:VCALENDAR
	+VERSION:2.0
	+PRODID:-//test/test//NONSGML v1.0//EN
	+BEGIN:VEVENT
	+UID:123456
	+DTSTAMP:19970714T170000Z
	+ORGANIZER;CN=John Doe:MAILTO:john.doe@example.com
	+DTSTART:20240715T170000Z
	+DTEND:20240715T180000Z
	+SUMMARY:Meeting
	+END:VEVENT
	+END:VCALENDAR
	diff --git a/tests/src/mail.itip1 b/tests/src/mail.itip1
	new file mode 100644
	--- /dev/null
	+++ b/tests/src/mail.itip1
	@@ -0,0 +1,62 @@
	+MIME-Version: 1.0
	+Date: Thu, 07 Dec 2023 13:29:14 +0100
	+Message-ID: <14ab307198d32cee00b38ffb54c9e577@nestle.kolab.ch>
	+From: "Organizer" <$from>
	+To: <$to>
	+Subject: You've been invited to "Test"
	+Content-Type: multipart/alternative;
	+ boundary="=_f39ac9438326f676a8d562e163aa31e0"
	+
	+--=_f39ac9438326f676a8d562e163aa31e0
	+Content-Transfer-Encoding: quoted-printable
	+Content-Type: text/plain; charset=UTF-8;
	+ format=flowed
	+
	+Test
	+--=_f39ac9438326f676a8d562e163aa31e0
	+Content-Transfer-Encoding: 8bit
	+Content-Type: text/calendar; charset=UTF-8; method=REQUEST; name=event.ics
	+
	+BEGIN:VCALENDAR
	+VERSION:2.0
	+PRODID:-//Roundcube 1.5-git//Sabre VObject 4.5.3//EN
	+CALSCALE:GREGORIAN
	+METHOD:REQUEST
	+BEGIN:VTIMEZONE
	+TZID:Europe/Warsaw
	+BEGIN:DAYLIGHT
	+DTSTART:20230326T010000
	+TZOFFSETFROM:+0100
	+TZOFFSETTO:+0200
	+TZNAME:CEST
	+END:DAYLIGHT
	+BEGIN:DAYLIGHT
	+DTSTART:20240331T010000
	+TZOFFSETFROM:+0100
	+TZOFFSETTO:+0200
	+TZNAME:CEST
	+END:DAYLIGHT
	+BEGIN:STANDARD
	+DTSTART:20231029T010000
	+TZOFFSETFROM:+0200
	+TZOFFSETTO:+0100
	+TZNAME:CET
	+END:STANDARD
	+END:VTIMEZONE
	+BEGIN:VEVENT
	+UID:1154B829349633D80E143AAB5641170A-93BC4FC398A3FD52
	+DTSTAMP:20231207T122914Z
	+CREATED:20231207T122914Z
	+LAST-MODIFIED:20231207T122914Z
	+DTSTART;TZID=Europe/Warsaw:20231207T140000
	+DTEND;TZID=Europe/Warsaw:20231207T143000
	+SUMMARY:Test
	+SEQUENCE:0
	+TRANSP:OPAQUE
	+ATTENDEE;CN="Attendee Name";PARTSTAT=NEEDS-ACTION;ROLE=REQ-PARTICIPA
	+ NT;CUTYPE=INDIVIDUAL;RSVP=TRUE:mailto:$to
	+ORGANIZER;CN="Organizer Name":mailto:$from
	+END:VEVENT
	+END:VCALENDAR
	+
	+--=_f39ac9438326f676a8d562e163aa31e0--
	diff --git a/tests/src/mail.sync1 b/tests/src/mail.sync1
	new file mode 100644
	--- /dev/null
	+++ b/tests/src/mail.sync1
	@@ -0,0 +1,10 @@
	+Date: Thu, 09 Aug 2012 13:18:31 +0000
	+Subject: test sync
	+Message-ID: <sync1@domain.tld>
	+From: "Sync 1" <user@domain.tld>
	+To: "To 1" <kolab1@domain.tld>, "To 2" <kolab2@domain.tld>
	+MIME-Version: 1.0
	+Content-Type: text/plain; charset=utf-8
	+Content-Transfer-Encoding: base64
	+
	+ZWVlYQ==
	diff --git a/tests/src/mail.sync2 b/tests/src/mail.sync2
	new file mode 100644
	--- /dev/null
	+++ b/tests/src/mail.sync2
	@@ -0,0 +1,20 @@
	+Date: Thu, 10 Aug 2012 13:18:31 +0000
	+Subject: sync test with attachment
	+Message-ID: <sync2@domain.tld>
	+From: user@domain.tld
	+To: kolab@domain.tld
	+MIME-Version: 1.0
	+Content-Type: multipart/mixed; boundary="BOUNDARY"
	+
	+--BOUNDARY
	+Content-Type: text/plain; charset=utf-8
	+Content-Transfer-Encoding: base64
	+
	+ZWVl
	+--BOUNDARY
	+Content-Transfer-Encoding: base64
	+Content-Type: image/jpeg; name=logo.gif
	+Content-Disposition: inline; filename=logo.gif; size=2574
	+
	+/9j/4AAQSkZJRgABAgEASABIAAD/4QqARXhpZgAATU0AKgAAAAgABwESAAMAAAABAAEAAAEaAAUA
	+--BOUNDARY--

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