rcube_kolab.php
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rcube_kolab.php
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	<?php

	/**
	* Utilities providing Kolab functionality using Kolab_* classes
	* from the Horde project.
	*
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2011, 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/>.
	*/

	ini_set('error_reporting', E_ALL&~(E_DEPRECATED \| E_NOTICE));

	require_once 'Horde/Kolab/Storage/List.php';
	require_once 'Horde/Kolab/Format.php';
	require_once 'Horde/Auth.php';
	require_once 'Horde/Auth/kolab.php';
	require_once 'Horde/Perms.php';

	/**
	* Glue class to handle access to the Kolab data using the Kolab_* classes
	* from the Horde project.
	*/
	class rcube_kolab
	{
	public static $last_error;

	private static $horde_auth;
	private static $config;
	private static $ready = false;
	private static $list;
	private static $cache;


	/**
	* Setup the environment needed by the Kolab_* classes to access Kolab data
	*/
	public static function setup()
	{
	global $conf;

	// setup already done
	if (self::$horde_auth)
	return;

	$rcmail = rcmail::get_instance();

	// get password of logged user
	$pwd = $rcmail->decrypt($_SESSION['password']);

	// load ldap credentials from local config
	$conf['kolab'] = (array) $rcmail->config->get('kolab');

	// Set global Horde config (e.g. Cache settings)
	if (!empty($conf['kolab']['global'])) {
	$conf = array_merge($conf, $conf['kolab']['global']);
	unset($conf['kolab']['global']);
	}

	// Set Horde configuration (for cache db)
	$dsnw = $rcmail->config->get('db_dsnw');
	$dsnr = $rcmail->config->get('db_dsnr');

	$conf['sql'] = MDB2::parseDSN($dsnw);
	$conf['sql']['charset'] = 'utf-8';

	if (!empty($dsnr) && $dsnr != $dsnw) {
	$conf['sql']['read'] = MDB2::parseDSN($dsnr);
	$conf['sql']['read']['charset'] = 'utf-8';
	$conf['sql']['splitread'] = true;
	}

	// Re-set LDAP/IMAP host config
	$ldap = array('server' => 'ldap://' . $_SESSION['imap_host'] . ':389');
	$imap = array('server' => $_SESSION['imap_host'], 'port' => $_SESSION['imap_port']);
	$freebusy = array('server' => 'https://' . $_SESSION['imap_host'] . '/freebusy');

	$conf['kolab']['ldap'] = array_merge($ldap, (array)$conf['kolab']['ldap']);
	$conf['kolab']['imap'] = array_merge($imap, (array)$conf['kolab']['imap']);
	$conf['kolab']['freebusy'] = array_merge($freebusy, (array)$conf['kolab']['freebusy']);
	self::$config = &$conf;

	// pass the current IMAP authentication credentials to the Horde auth system
	self::$horde_auth = Auth::singleton('kolab');

	$username = $_SESSION['username'];
	$credentials = array('password' => $pwd);

	// Hack proxy auth for "Login As" feature of kolab_auth plugin
	if (!empty($_SESSION['kolab_auth_admin'])) {
	$username = $_SESSION['kolab_auth_admin'];
	$conf['kolab']['imap']['user'] = $_SESSION['username'];
	$conf['kolab']['imap']['authuser'] = $rcmail->decrypt($_SESSION['kolab_auth_login']);
	$conf['kolab']['imap']['password'] = $rcmail->decrypt($_SESSION['kolab_auth_password']);
	$conf['kolab']['user_mail'] = $_SESSION['username'];
	}

	if (self::$horde_auth->isAuthenticated()) {
	self::$ready = true;
	}
	else if (self::$horde_auth->authenticate($username, $credentials, false)) {
	// we could use Auth::setAuth() here, but it requires the whole bunch
	// of includes and global objects, do it as simple as possible
	$_SESSION['__auth'] = array(
	'authenticated' => true,
	'userId' => $_SESSION['username'],
	'timestamp' => time(),
	'remote_addr' => $_SERVER['REMOTE_ADDR'],
	);
	Auth::setCredential('password', $pwd);
	self::$ready = true;
	}
	else {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => sprintf("Unable to authenticate user %s!", $_SESSION['username'])),
	true, true);
	}

	// Register shutdown function for saving cache/session objects
	$rcmail->add_shutdown_function(array('rcube_kolab', 'shutdown'));

	NLS::setCharset('UTF-8');
	String::setDefaultCharset('UTF-8');
	}

	/**
	* Get instance of Kolab_List object
	*
	* @return object Kolab_List Folders list object
	*/
	public static function get_folders_list()
	{
	self::setup();

	if (self::$list)
	return self::$list;

	if (!self::$ready)
	return null;

	$rcmail = rcmail::get_instance();
	$imap_cache = $rcmail->config->get('imap_cache');

	if ($imap_cache) {
	self::$cache = $rcmail->get_cache('IMAP', $imap_cache);
	self::$list = self::$cache->get('mailboxes.kolab');

	// Disable Horde folders caching, we're using our own cache
	self::$config['kolab']['imap']['cache_folders'] = false;
	}

	if (empty(self::$list)) {
	self::$list = Kolab_List::singleton();
	}

	return self::$list;
	}

	/**
	* Get instance of a Kolab (XML) format object
	*
	* @param string Data type (contact,event,task,note)
	*
	* @return object Horde_Kolab_Format_XML The format object
	*/
	public static function get_format($type)
	{
	self::setup();
	return Horde_Kolab_Format::factory('XML', $type);
	}

	/**
	* Get a list of storage folders for the given data type
	*
	* @param string Data type to list folders for (contact,event,task,note)
	*
	* @return array List of Kolab_Folder objects (folder names in UTF7-IMAP)
	*/
	public static function get_folders($type)
	{
	$kolab = self::get_folders_list();
	return self::$ready ? $kolab->getByType($type) : array();
	}

	/**
	* Getter for a specific storage folder
	*
	* @param string IMAP folder to access (UTF7-IMAP)
	* @return object Kolab_Folder The folder object
	*/
	public static function get_folder($folder)
	{
	$kolab = self::get_folders_list();
	return self::$ready ? $kolab->getFolder($folder) : null;
	}

	/**
	* Checks if the given folder is subscribed.
	* Much nicer would be if the Kolab_Folder object could tell this information
	*
	* @param string Full IMAP folder name
	* @return boolean True if in the list of subscribed folders, False if not
	*/
	public static function is_subscribed($folder)
	{
	static $subscribed; // local cache

	if (!$subscribed) {
	$rcmail = rcmail::get_instance();
	$storage = $rcmail->get_storage();
	$subscribed = $storage->list_folders();
	}

	return in_array($folder, $subscribed);
	}

	/**
	* Get storage object for read/write access to the Kolab backend
	*
	* @param string IMAP folder to access (UTF7-IMAP)
	* @param string Object type to deal with (leave empty for auto-detection using annotations)
	*
	* @return object Kolab_Data The data storage object
	*/
	public static function get_storage($folder, $data_type = null)
	{
	$kolab = self::get_folders_list();
	return self::$ready ? $kolab->getFolder($folder)->getData($data_type) : null;
	}

	/**
	* Compose an URL to query the free/busy status for the given user
	*/
	public static function get_freebusy_url($email)
	{
	return unslashify(self::$config['kolab']['freebusy']['server']) . '/' . $email . '.ifb';
	}

	/**
	* Do session/cache operations on shutdown
	*/
	public static function shutdown()
	{
	if (self::$ready) {
	// Horde's shutdown function doesn't work with Roundcube session
	// save Horde_Kolab_Session object in session here
	require_once 'Horde/SessionObjects.php';
	$session = Horde_SessionObjects::singleton();
	$kolab = Horde_Kolab_Session::singleton();
	$session->overwrite('kolab_session', $kolab, false);

	// Write Kolab_List object to cache
	if (self::$cache && self::$list) {
	self::$cache->set('mailboxes.kolab', self::$list);
	}
	}
	}

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

	/**
	* Deletes IMAP folder
	*
	* @param string $name Folder name (UTF7-IMAP)
	*
	* @return bool True on success, false on failure
	*/
	public static function folder_delete($name)
	{
	$kolab = self::get_folders_list();

	$folder = $kolab->getFolder($name);
	$result = $folder->delete();

	if (is_object($result) && is_a($result, 'PEAR_Error')) {
	self::$last_error = $result->getMessage();
	return false;
	}

	return true;
	}

	/**
	* Creates IMAP folder
	*
	* @param string $name Folder name (UTF7-IMAP)
	* @param string $type Folder type
	* @param bool $default True if older is default (for specified type)
	*
	* @return bool True on success, false on failure
	*/
	public static function folder_create($name, $type=null, $default=false)
	{
	$kolab = self::get_folders_list();

	$folder = new Kolab_Folder();
	$folder->setList($kolab);
	$folder->setFolder($name);

	$result = $folder->save(array(
	'type' => $type,
	'default' => $default,
	));

	if (is_object($result) && is_a($result, 'PEAR_Error')) {
	self::$last_error = $result->getMessage();
	return false;
	}

	return true;
	}

	/**
	* Renames IMAP folder
	*
	* @param string $oldname Old folder name (UTF7-IMAP)
	* @param string $newname New folder name (UTF7-IMAP)
	*
	* @return bool True on success, false on failure
	*/
	public static function folder_rename($oldname, $newname)
	{
	$kolab = self::get_folders_list();

	$folder = $kolab->getFolder($oldname);
	$folder->setFolder($newname);

	$result = $kolab->rename($folder);
	if (is_object($result) && is_a($result, 'PEAR_Error')) {
	self::$last_error = $result->getMessage();
	return false;
	}

	// @TODO: Horde doesn't update subfolders cache nor subscriptions
	// but we cannot use Roundcube imap object here, because
	// when two connections are used in one request and we have
	// multi-server configuration, updating the cache after all
	// would get wrong information (e.g. annotations)

	// Reset the List object and cache
	$kolab = null;
	if (self::$cache) {
	self::$list = null;
	self::$cache->remove('mailboxes', true);
	}

	return true;
	}

	/**
	* Getter for human-readable name of Kolab object (folder)
	* See http://wiki.kolab.org/UI-Concepts/Folder-Listing for reference
	*
	* @param string $folder IMAP folder name (UTF7-IMAP)
	* @param string $folder_ns Will be set to namespace name of the folder
	*
	* @return string Name of the folder-object
	*/
	public static function object_name($folder, &$folder_ns=null)
	{
	$rcmail = rcmail::get_instance();
	$storage = $rcmail->get_storage();
	$namespace = $storage->get_namespace();
	$found = false;

	if (!empty($namespace['shared'])) {
	foreach ($namespace['shared'] as $ns) {
	if (strlen($ns[0]) && strpos($folder, $ns[0]) === 0) {
	$prefix = '';
	$folder = substr($folder, strlen($ns[0]));
	$delim = $ns[1];
	$found = true;
	$folder_ns = 'shared';
	break;
	}
	}
	}
	if (!$found && !empty($namespace['other'])) {
	foreach ($namespace['other'] as $ns) {
	if (strlen($ns[0]) && strpos($folder, $ns[0]) === 0) {
	// remove namespace prefix
	$folder = substr($folder, strlen($ns[0]));
	$delim = $ns[1];
	// get username
	$pos = strpos($folder, $delim);
	if ($pos) {
	$prefix = '('.substr($folder, 0, $pos).') ';
	$folder = substr($folder, $pos+1);
	}
	else {
	$prefix = '('.$folder.')';
	$folder = '';
	}
	$found = true;
	$folder_ns = 'other';
	break;
	}
	}
	}
	if (!$found && !empty($namespace['personal'])) {
	foreach ($namespace['personal'] as $ns) {
	if (strlen($ns[0]) && strpos($folder, $ns[0]) === 0) {
	// remove namespace prefix
	$folder = substr($folder, strlen($ns[0]));
	$prefix = '';
	$delim = $ns[1];
	$found = true;
	break;
	}
	}
	}

	if (empty($delim))
	$delim = $storage->get_hierarchy_delimiter();

	$folder = rcube_charset::convert($folder, 'UTF7-IMAP');
	$folder = str_replace($delim, ' » ', $folder);

	if ($prefix)
	$folder = $prefix . ' ' . $folder;

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

	return $folder;
	}

	/**
	* Getter for the name of the namespace to which the IMAP folder belongs
	*
	* @param string $folder IMAP folder name (UTF7-IMAP)
	*
	* @return string Name of the namespace (personal, other, shared)
	*/
	public static function folder_namespace($folder)
	{
	$rcmail = rcmail::get_instance();
	$storage = $rcmail->get_storage();
	$namespace = $storage->get_namespace();

	if (!empty($namespace)) {
	foreach ($namespace as $nsname => $nsvalue) {
	if (in_array($nsname, array('personal', 'other', 'shared')) && !empty($nsvalue)) {
	foreach ($nsvalue as $ns) {
	if (strlen($ns[0]) && strpos($folder, $ns[0]) === 0) {
	return $namespace = $nsname;
	}
	}
	}
	}
	}

	return 'personal';
	}

	/**
	* Creates a SELECT field with folders list
	*
	* @param string $type Folder type
	* @param array $attrs SELECT field attributes (e.g. name)
	* @param string $current The name of current folder (to skip it)
	*
	* @return html_select SELECT object
	*/
	public static function folder_selector($type, $attrs, $current = '')
	{
	$rcmail = rcmail::get_instance();
	$storage = $rcmail->get_storage();

	// get all folders of specified type
	$folders = self::get_folders($type);

	$delim = $storage->get_hierarchy_delimiter();
	$names = array();
	$len = strlen($current);

	if ($len && ($rpos = strrpos($current, $delim))) {
	$parent = substr($current, 0, $rpos);
	$p_len = strlen($parent);
	}

	// Filter folders list
	foreach ($folders as $c_folder) {
	$name = $c_folder->name;
	// skip current folder and it's subfolders
	if ($len && ($name == $current \|\| strpos($name, $current.$delim) === 0)) {
	continue;
	}

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

	$names[$name] = rcube_charset::convert($name, 'UTF7-IMAP');
	}

	// Make sure parent folder is listed (might be skipped e.g. if it's namespace root)
	if ($p_len && !isset($names[$parent])) {
	$names[$parent] = rcube_charset::convert($parent, 'UTF7-IMAP');
	}

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

	$folders = array_keys($names);
	$names = array();

	// Build SELECT field of parent folder
	$select = new html_select($attrs);
	$select->add('---', '');

	foreach ($folders as $name) {
	$imap_name = $name;
	$name = $origname = self::object_name($name);

	// find folder prefix to truncate
	for ($i = count($names)-1; $i >= 0; $i--) {
	if (strpos($name, $names[$i].' » ') === 0) {
	$length = strlen($names[$i].' » ');
	$prefix = substr($name, 0, $length);
	$count = count(explode(' » ', $prefix));
	$name = str_repeat('  ', $count-1) . '» ' . substr($name, $length);
	break;
	}
	}

	$names[] = $origname;

	$select->add($name, $imap_name);
	}

	return $select;
	}

	}

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