kolab_sync_backend.php
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kolab_sync_backend.php
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	<?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 $type Folder type
	*
	* @return array\|bool List of mailbox folders, False on backend failure
	*/
	public function folders_list($deviceid, $type)
	{
	// get all folders of specified type
	$folders = (array) 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;
	}

	if (!empty($type) && !in_array($folder, $folders)) {
	continue;
	}

	// Activesync folder identifier (serverId)
	$folder_type = $typedata[$folder];
	$folder_id = self::folder_id($folder, $folder_type);

	$folders_list[$folder_id] = $this->folder_data($folder, $folder_type);
	}

	return $folders_list;
	}

	/**
	* 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)) {
	$this->folder_meta = array();
	// get folders activesync config
	$folderdata = $this->storage->get_metadata("*", self::ASYNC_KEY);

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

	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 = $metadata[$name];

	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;
	}

	if (!$flag) {
	unset($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($this->folder_meta[$name], $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();

	$result = $devices_list[$id];

	return $result;
	}

	/**
	* 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'
	);

	// 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] ?: '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($type)
	{
	if ($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 '';
	}

	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
	$type = self::type_kolab2activesync($type);
	// fix type, if there's no type annotation it's detected as UNKNOWN
	// we'll use 'mail' (12) or 'mail.inbox' (2)
	if ($type == 1) {
	$type = $folder == 'INBOX' ? 2 : 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,
	);
	}

	/**
	* 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

	if ($name === '' \|\| !is_string($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;
	}
	*/
	// Add type to folder UID hash, so type change can be detected by Syncroton
	$uid = $name . '!!' . ($type !== null ? $type : kolab_storage::folder_type($name));
	$uid = md5($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];

	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];

	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];
	}

	/**
	* 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;
	}
	}

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