rcmail.php
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rcmail.php
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	<?php

	/*
	+-----------------------------------------------------------------------+
	\| program/include/rcmail.php \|
	\| \|
	\| This file is part of the RoundCube Webmail client \|
	\| Copyright (C) 2008, RoundCube Dev. - Switzerland \|
	\| Licensed under the GNU GPL \|
	\| \|
	\| PURPOSE: \|
	\| Application class providing core functions and holding \|
	\| instances of all 'global' objects like db- and imap-connections \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+

	$Id: rcmail.php 328 2006-08-30 17:41:21Z thomasb $

	*/


	/**
	* Application class of RoundCube Webmail
	* implemented as singleton
	*
	* @package Core
	*/
	class rcmail
	{
	static public $main_tasks = array('mail','settings','addressbook','login','logout');

	static private $instance;

	public $config;
	public $user;
	public $db;
	public $imap;
	public $output;
	public $task = 'mail';
	public $action = '';
	public $comm_path = './';

	private $texts;


	/**
	* This implements the 'singleton' design pattern
	*
	* @return object qvert The one and only instance
	*/
	static function get_instance()
	{
	if (!self::$instance) {
	self::$instance = new rcmail();
	self::$instance->startup(); // init AFTER object was linked with self::$instance
	}

	return self::$instance;
	}


	/**
	* Private constructor
	*/
	private function __construct()
	{
	// load configuration
	$this->config = new rcube_config();

	register_shutdown_function(array($this, 'shutdown'));
	}


	/**
	* Initial startup function
	* to register session, create database and imap connections
	*
	* @todo Remove global vars $DB, $USER
	*/
	private function startup()
	{
	$config_all = $this->config->all();

	// initialize syslog
	if ($this->config->get('log_driver') == 'syslog') {
	$syslog_id = $this->config->get('syslog_id', 'roundcube');
	$syslog_facility = $this->config->get('syslog_facility', LOG_USER);
	openlog($syslog_id, LOG_ODELAY, $syslog_facility);
	}

	// set task and action properties
	$this->set_task(strip_quotes(get_input_value('_task', RCUBE_INPUT_GPC)));
	$this->action = asciiwords(get_input_value('_action', RCUBE_INPUT_GPC));

	// connect to database
	$GLOBALS['DB'] = $this->get_dbh();

	// use database for storing session data
	include_once('include/session.inc');

	// set session domain
	if (!empty($config_all['session_domain'])) {
	ini_set('session.cookie_domain', $config_all['session_domain']);
	}
	// set session garbage collecting time according to session_lifetime
	if (!empty($config_all['session_lifetime'])) {
	ini_set('session.gc_maxlifetime', ($config_all['session_lifetime']) * 120);
	}

	// start PHP session (if not in CLI mode)
	if ($_SERVER['REMOTE_ADDR'])
	session_start();

	// set initial session vars
	if (!isset($_SESSION['auth_time'])) {
	$_SESSION['auth_time'] = time();
	$_SESSION['temp'] = true;
	}

	// create user object
	$this->set_user(new rcube_user($_SESSION['user_id']));

	// reset some session parameters when changing task
	if ($_SESSION['task'] != $this->task)
	unset($_SESSION['page']);

	// set current task to session
	$_SESSION['task'] = $this->task;

	// create IMAP object
	if ($this->task == 'mail')
	$this->imap_init();
	}


	/**
	* Setter for application task
	*
	* @param string Task to set
	*/
	public function set_task($task)
	{
	if (!in_array($task, self::$main_tasks))
	$task = 'mail';

	$this->task = $task;
	$this->comm_path = $this->url(array('task' => $task));

	if ($this->output)
	$this->output->set_env('task', $task);
	}


	/**
	* Setter for system user object
	*
	* @param object rcube_user Current user instance
	*/
	public function set_user($user)
	{
	if (is_object($user)) {
	$this->user = $user;
	$GLOBALS['USER'] = $this->user;

	// overwrite config with user preferences
	$this->config->merge((array)$this->user->get_prefs());
	}

	$_SESSION['language'] = $this->user->language = $this->language_prop($this->config->get('language', $_SESSION['language']));

	// set localization
	setlocale(LC_ALL, $_SESSION['language'] . '.utf8');
	}


	/**
	* Check the given string and return a valid language code
	*
	* @param string Language code
	* @return string Valid language code
	*/
	private function language_prop($lang)
	{
	static $rcube_languages, $rcube_language_aliases;

	// user HTTP_ACCEPT_LANGUAGE if no language is specified
	if (empty($lang) \|\| $lang == 'auto') {
	$accept_langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
	$lang = str_replace('-', '_', $accept_langs[0]);
	}

	if (empty($rcube_languages)) {
	@include(INSTALL_PATH . 'program/localization/index.inc');
	}

	// check if we have an alias for that language
	if (!isset($rcube_languages[$lang]) && isset($rcube_language_aliases[$lang])) {
	$lang = $rcube_language_aliases[$lang];
	}
	// try the first two chars
	else if (!isset($rcube_languages[$lang])) {
	$short = substr($lang, 0, 2);

	// check if we have an alias for the short language code
	if (!isset($rcube_languages[$short]) && isset($rcube_language_aliases[$short])) {
	$lang = $rcube_language_aliases[$short];
	}
	// expand 'nn' to 'nn_NN'
	else if (!isset($rcube_languages[$short])) {
	$lang = $short.'_'.strtoupper($short);
	}
	}

	if (!isset($rcube_languages[$lang]) \|\| !is_dir(INSTALL_PATH . 'program/localization/' . $lang)) {
	$lang = 'en_US';
	}

	return $lang;
	}


	/**
	* Get the current database connection
	*
	* @return object rcube_db Database connection object
	*/
	public function get_dbh()
	{
	if (!$this->db) {
	$config_all = $this->config->all();

	$this->db = new rcube_mdb2($config_all['db_dsnw'], $config_all['db_dsnr'], $config_all['db_persistent']);
	$this->db->sqlite_initials = INSTALL_PATH . 'SQL/sqlite.initial.sql';
	$this->db->set_debug((bool)$config_all['sql_debug']);
	$this->db->db_connect('w');
	}

	return $this->db;
	}


	/**
	* Return instance of the internal address book class
	*
	* @param boolean True if the address book needs to be writeable
	* @return object rcube_contacts Address book object
	*/
	public function get_address_book($id, $writeable = false)
	{
	$contacts = null;
	$ldap_config = (array)$this->config->get('ldap_public');
	$abook_type = strtolower($this->config->get('address_book_type'));

	if ($id && $ldap_config[$id]) {
	$contacts = new rcube_ldap($ldap_config[$id]);
	}
	else if ($abook_type == 'ldap') {
	// Use the first writable LDAP address book.
	foreach ($ldap_config as $id => $prop) {
	if (!$writeable \|\| $prop['writable']) {
	$contacts = new rcube_ldap($prop);
	break;
	}
	}
	}
	else {
	$contacts = new rcube_contacts($this->db, $this->user->ID);
	}

	return $contacts;
	}


	/**
	* Init output object for GUI and add common scripts.
	* This will instantiate a rcmail_template object and set
	* environment vars according to the current session and configuration
	*
	* @param boolean True if this request is loaded in a (i)frame
	* @return object rcube_template Reference to HTML output object
	*/
	public function load_gui($framed = false)
	{
	// init output page
	if (!($this->output instanceof rcube_template))
	$this->output = new rcube_template($this->task, $framed);

	foreach (array('flag_for_deletion','read_when_deleted') as $js_config_var) {
	$this->output->set_env($js_config_var, $this->config->get($js_config_var));
	}

	if ($framed) {
	$this->comm_path .= '&_framed=1';
	$this->output->set_env('framed', true);
	}

	$this->output->set_env('task', $this->task);
	$this->output->set_env('action', $this->action);
	$this->output->set_env('comm_path', $this->comm_path);
	$this->output->set_charset($this->config->get('charset', RCMAIL_CHARSET));

	// add some basic label to client
	$this->output->add_label('loading');

	return $this->output;
	}


	/**
	* Create an output object for JSON responses
	*
	* @return object rcube_json_output Reference to JSON output object
	*/
	public function init_json()
	{
	if (!($this->output instanceof rcube_json_output))
	$this->output = new rcube_json_output($this->task);

	return $this->output;
	}


	/**
	* Create global IMAP object and connect to server
	*
	* @param boolean True if connection should be established
	* @todo Remove global $IMAP
	*/
	public function imap_init($connect = false)
	{
	$this->imap = new rcube_imap($this->db);
	$this->imap->debug_level = $this->config->get('debug_level');
	$this->imap->skip_deleted = $this->config->get('skip_deleted');

	// enable caching of imap data
	if ($this->config->get('enable_caching')) {
	$this->imap->set_caching(true);
	}

	// set pagesize from config
	$this->imap->set_pagesize($this->config->get('pagesize', 50));

	// set global object for backward compatibility
	$GLOBALS['IMAP'] = $this->imap;

	if ($connect)
	$this->imap_connect();
	}


	/**
	* Connect to IMAP server with stored session data
	*
	* @return bool True on success, false on error
	*/
	public function imap_connect()
	{
	$conn = false;

	if ($_SESSION['imap_host'] && !$this->imap->conn) {
	if (!($conn = $this->imap->connect($_SESSION['imap_host'], $_SESSION['username'], $this->decrypt_passwd($_SESSION['password']), $_SESSION['imap_port'], $_SESSION['imap_ssl'], rcmail::get_instance()->config->get('imap_auth_type', 'check')))) {
	if ($this->output)
	$this->output->show_message($this->imap->error_code == -1 ? 'imaperror' : 'sessionerror', 'error');
	}

	$this->set_imap_prop();
	}

	return $conn;
	}


	/**
	* Perfom login to the IMAP server and to the webmail service.
	* This will also create a new user entry if auto_create_user is configured.
	*
	* @param string IMAP user name
	* @param string IMAP password
	* @param string IMAP host
	* @return boolean True on success, False on failure
	*/
	function login($username, $pass, $host=NULL)
	{
	$user = NULL;
	$config = $this->config->all();

	if (!$host)
	$host = $config['default_host'];

	// Validate that selected host is in the list of configured hosts
	if (is_array($config['default_host'])) {
	$allowed = false;
	foreach ($config['default_host'] as $key => $host_allowed) {
	if (!is_numeric($key))
	$host_allowed = $key;
	if ($host == $host_allowed) {
	$allowed = true;
	break;
	}
	}
	if (!$allowed)
	return false;
	}
	else if (!empty($config['default_host']) && $host != $config['default_host'])
	return false;

	// parse $host URL
	$a_host = parse_url($host);
	if ($a_host['host']) {
	$host = $a_host['host'];
	$imap_ssl = (isset($a_host['scheme']) && in_array($a_host['scheme'], array('ssl','imaps','tls'))) ? $a_host['scheme'] : null;
	$imap_port = isset($a_host['port']) ? $a_host['port'] : ($imap_ssl ? 993 : $config['default_port']);
	}
	else
	$imap_port = $config['default_port'];


	/* Modify username with domain if required
	Inspired by Marco <P0L0_notspam_binware.org>
	*/
	// Check if we need to add domain
	if (!empty($config['username_domain']) && !strpos($username, '@')) {
	if (is_array($config['username_domain']) && isset($config['username_domain'][$host]))
	$username .= '@'.$config['username_domain'][$host];
	else if (is_string($config['username_domain']))
	$username .= '@'.$config['username_domain'];
	}

	// try to resolve email address from virtuser table
	if (!empty($config['virtuser_file']) && strpos($username, '@'))
	$username = rcube_user::email2user($username);

	// lowercase username if it's an e-mail address (#1484473)
	if (strpos($username, '@'))
	$username = strtolower($username);

	// user already registered -> overwrite username
	if ($user = rcube_user::query($username, $host))
	$username = $user->data['username'];

	// exit if IMAP login failed
	if (!($imap_login = $this->imap->connect($host, $username, $pass, $imap_port, $imap_ssl, $config['imap_auth_type'])))
	return false;

	// user already registered -> update user's record
	if (is_object($user)) {
	$user->touch();
	}
	// create new system user
	else if ($config['auto_create_user']) {
	if ($created = rcube_user::create($username, $host)) {
	$user = $created;

	// get existing mailboxes (but why?)
	// $a_mailboxes = $this->imap->list_mailboxes();
	}
	}
	else {
	raise_error(array(
	'code' => 600,
	'type' => 'php',
	'file' => "config/main.inc.php",
	'message' => "Acces denied for new user $username. 'auto_create_user' is disabled"
	), true, false);
	}

	// login succeeded
	if (is_object($user) && $user->ID) {
	$this->set_user($user);

	// set session vars
	$_SESSION['user_id'] = $user->ID;
	$_SESSION['username'] = $user->data['username'];
	$_SESSION['imap_host'] = $host;
	$_SESSION['imap_port'] = $imap_port;
	$_SESSION['imap_ssl'] = $imap_ssl;
	$_SESSION['password'] = $this->encrypt_passwd($pass);
	$_SESSION['login_time'] = mktime();

	if ($_REQUEST['_timezone'] != '_default_')
	$_SESSION['timezone'] = floatval($_REQUEST['_timezone']);

	// force reloading complete list of subscribed mailboxes
	$this->set_imap_prop();
	$this->imap->clear_cache('mailboxes');

	if ($config['create_default_folders'])
	$this->imap->create_default_folders();

	return true;
	}

	return false;
	}


	/**
	* Set root dir and last stored mailbox
	* This must be done AFTER connecting to the server!
	*/
	public function set_imap_prop()
	{
	$this->imap->set_charset($this->config->get('default_charset', RCMAIL_CHARSET));

	// set root dir from config
	if ($imap_root = $this->config->get('imap_root')) {
	$this->imap->set_rootdir($imap_root);
	}
	if ($default_folders = $this->config->get('default_imap_folders')) {
	$this->imap->set_default_mailboxes($default_folders);
	}
	if (!empty($_SESSION['mbox'])) {
	$this->imap->set_mailbox($_SESSION['mbox']);
	}
	if (isset($_SESSION['page'])) {
	$this->imap->set_page($_SESSION['page']);
	}
	}


	/**
	* Auto-select IMAP host based on the posted login information
	*
	* @return string Selected IMAP host
	*/
	public function autoselect_host()
	{
	$default_host = $this->config->get('default_host');
	$host = null;

	if (is_array($default_host)) {
	$post_host = get_input_value('_host', RCUBE_INPUT_POST);

	// direct match in default_host array
	if ($default_host[$post_host] \|\| in_array($post_host, array_values($default_host))) {
	$host = $post_host;
	}

	// try to select host by mail domain
	list($user, $domain) = explode('@', get_input_value('_user', RCUBE_INPUT_POST));
	if (!empty($domain)) {
	foreach ($default_host as $imap_host => $mail_domains) {
	if (is_array($mail_domains) && in_array($domain, $mail_domains)) {
	$host = $imap_host;
	break;
	}
	}
	}

	// take the first entry if $host is still an array
	if (empty($host)) {
	$host = array_shift($default_host);
	}
	}
	else if (empty($default_host)) {
	$host = get_input_value('_host', RCUBE_INPUT_POST);
	}
	else
	$host = $default_host;

	return $host;
	}


	/**
	* Get localized text in the desired language
	*
	* @param mixed Named parameters array or label name
	* @return string Localized text
	*/
	public function gettext($attrib)
	{
	// load localization files if not done yet
	if (empty($this->texts))
	$this->load_language();

	// extract attributes
	if (is_string($attrib))
	$attrib = array('name' => $attrib);

	$nr = is_numeric($attrib['nr']) ? $attrib['nr'] : 1;
	$vars = isset($attrib['vars']) ? $attrib['vars'] : '';

	$command_name = !empty($attrib['command']) ? $attrib['command'] : NULL;
	$alias = $attrib['name'] ? $attrib['name'] : ($command_name && $command_label_map[$command_name] ? $command_label_map[$command_name] : '');

	// text does not exist
	if (!($text_item = $this->texts[$alias])) {
	/*
	raise_error(array(
	'code' => 500,
	'type' => 'php',
	'line' => __LINE__,
	'file' => __FILE__,
	'message' => "Missing localized text for '$alias' in '$sess_user_lang'"), TRUE, FALSE);
	*/
	return "[$alias]";
	}

	// make text item array
	$a_text_item = is_array($text_item) ? $text_item : array('single' => $text_item);

	// decide which text to use
	if ($nr == 1) {
	$text = $a_text_item['single'];
	}
	else if ($nr > 0) {
	$text = $a_text_item['multiple'];
	}
	else if ($nr == 0) {
	if ($a_text_item['none'])
	$text = $a_text_item['none'];
	else if ($a_text_item['single'])
	$text = $a_text_item['single'];
	else if ($a_text_item['multiple'])
	$text = $a_text_item['multiple'];
	}

	// default text is single
	if ($text == '') {
	$text = $a_text_item['single'];
	}

	// replace vars in text
	if (is_array($attrib['vars'])) {
	foreach ($attrib['vars'] as $var_key => $var_value)
	$a_replace_vars[$var_key{0}=='$' ? substr($var_key, 1) : $var_key] = $var_value;
	}

	if ($a_replace_vars)
	$text = preg_replace('/\$\{?([_a-z]{1}[_a-z0-9]*)\}?/ei', '$a_replace_vars["\1"]', $text);

	// format output
	if (($attrib['uppercase'] && strtolower($attrib['uppercase']=='first')) \|\| $attrib['ucfirst'])
	return ucfirst($text);
	else if ($attrib['uppercase'])
	return strtoupper($text);
	else if ($attrib['lowercase'])
	return strtolower($text);

	return $text;
	}


	/**
	* Load a localization package
	*
	* @param string Language ID
	*/
	public function load_language($lang = null)
	{
	$lang = $this->language_prop(($lang ? $lang : $_SESSION['language']));

	// load localized texts
	if (empty($this->texts) \|\| $lang != $_SESSION['language']) {
	$this->texts = array();

	// get english labels (these should be complete)
	@include(INSTALL_PATH . 'program/localization/en_US/labels.inc');
	@include(INSTALL_PATH . 'program/localization/en_US/messages.inc');

	if (is_array($labels))
	$this->texts = $labels;
	if (is_array($messages))
	$this->texts = array_merge($this->texts, $messages);

	// include user language files
	if ($lang != 'en' && is_dir(INSTALL_PATH . 'program/localization/' . $lang)) {
	include_once(INSTALL_PATH . 'program/localization/' . $lang . '/labels.inc');
	include_once(INSTALL_PATH . 'program/localization/' . $lang . '/messages.inc');

	if (is_array($labels))
	$this->texts = array_merge($this->texts, $labels);
	if (is_array($messages))
	$this->texts = array_merge($this->texts, $messages);
	}

	$_SESSION['language'] = $lang;
	}
	}


	/**
	* Read directory program/localization and return a list of available languages
	*
	* @return array List of available localizations
	*/
	public function list_languages()
	{
	static $sa_languages = array();

	if (!sizeof($sa_languages)) {
	@include(INSTALL_PATH . 'program/localization/index.inc');

	if ($dh = @opendir(INSTALL_PATH . 'program/localization')) {
	while (($name = readdir($dh)) !== false) {
	if ($name{0}=='.' \|\| !is_dir(INSTALL_PATH . 'program/localization/' . $name))
	continue;

	if ($label = $rcube_languages[$name])
	$sa_languages[$name] = $label ? $label : $name;
	}
	closedir($dh);
	}
	}

	return $sa_languages;
	}


	/**
	* Check the auth hash sent by the client against the local session credentials
	*
	* @return boolean True if valid, False if not
	*/
	function authenticate_session()
	{
	global $SESS_CLIENT_IP, $SESS_CHANGED;

	// advanced session authentication
	if ($this->config->get('double_auth')) {
	$now = time();
	$valid = ($_COOKIE['sessauth'] == $this->get_auth_hash(session_id(), $_SESSION['auth_time']) \|\|
	$_COOKIE['sessauth'] == $this->get_auth_hash(session_id(), $_SESSION['last_auth']));

	// renew auth cookie every 5 minutes (only for GET requests)
	if (!$valid \|\| ($_SERVER['REQUEST_METHOD']!='POST' && $now - $_SESSION['auth_time'] > 300)) {
	$_SESSION['last_auth'] = $_SESSION['auth_time'];
	$_SESSION['auth_time'] = $now;
	setcookie('sessauth', $this->get_auth_hash(session_id(), $now));
	}
	}
	else {
	$valid = $this->config->get('ip_check') ? $_SERVER['REMOTE_ADDR'] == $SESS_CLIENT_IP : true;
	}

	// check session filetime
	$lifetime = $this->config->get('session_lifetime');
	if (!empty($lifetime) && isset($SESS_CHANGED) && $SESS_CHANGED + $lifetime*60 < time()) {
	$valid = false;
	}

	return $valid;
	}


	/**
	* Destroy session data and remove cookie
	*/
	public function kill_session()
	{
	$_SESSION = array('language' => $this->user->language, 'auth_time' => time(), 'temp' => true);
	setcookie('sessauth', '-del-', time() - 60);
	$this->user->reset();
	}


	/**
	* Do server side actions on logout
	*/
	public function logout_actions()
	{
	$config = $this->config->all();

	// on logout action we're not connected to imap server
	if (($config['logout_purge'] && !empty($config['trash_mbox'])) \|\| $config['logout_expunge']) {
	if (!$this->authenticate_session())
	return;

	$this->imap_init(true);
	}

	if ($config['logout_purge'] && !empty($config['trash_mbox'])) {
	$this->imap->clear_mailbox($config['trash_mbox']);
	}

	if ($config['logout_expunge']) {
	$this->imap->expunge('INBOX');
	}
	}


	/**
	* Function to be executed in script shutdown
	* Registered with register_shutdown_function()
	*/
	public function shutdown()
	{
	if (is_object($this->imap)) {
	$this->imap->close();
	$this->imap->write_cache();
	}

	if (is_object($this->contacts))
	$this->contacts->close();

	// before closing the database connection, write session data
	if ($_SERVER['REMOTE_ADDR'])
	session_write_close();
	}


	/**
	* Create unique authorization hash
	*
	* @param string Session ID
	* @param int Timestamp
	* @return string The generated auth hash
	*/
	private function get_auth_hash($sess_id, $ts)
	{
	$auth_string = sprintf('rcmailsess%sR%sChk:%s;%s',
	$sess_id,
	$ts,
	$this->config->get('ip_check') ? $_SERVER['REMOTE_ADDR'] : '*...*',
	$_SERVER['HTTP_USER_AGENT']);

	if (function_exists('sha1'))
	return sha1($auth_string);
	else
	return md5($auth_string);
	}

	/**
	* Encrypt IMAP password using DES encryption
	*
	* @param string Password to encrypt
	* @return string Encryprted string
	*/
	public function encrypt_passwd($pass)
	{
	if (function_exists('mcrypt_module_open') && ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_ECB, ""))) {
	$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
	mcrypt_generic_init($td, $this->config->get_des_key(), $iv);
	$cypher = mcrypt_generic($td, $pass);
	mcrypt_generic_deinit($td);
	mcrypt_module_close($td);
	}
	else if (function_exists('des')) {
	$cypher = des($this->config->get_des_key(), $pass, 1, 0, NULL);
	}
	else {
	$cypher = $pass;

	raise_error(array(
	'code' => 500,
	'type' => 'php',
	'file' => __FILE__,
	'message' => "Could not convert encrypt password. Make sure Mcrypt is installed or lib/des.inc is available"
	), true, false);
	}

	return base64_encode($cypher);
	}


	/**
	* Decrypt IMAP password using DES encryption
	*
	* @param string Encrypted password
	* @return string Plain password
	*/
	public function decrypt_passwd($cypher)
	{
	if (function_exists('mcrypt_module_open') && ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_ECB, ""))) {
	$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
	mcrypt_generic_init($td, $this->config->get_des_key(), $iv);
	$pass = mdecrypt_generic($td, base64_decode($cypher));
	mcrypt_generic_deinit($td);
	mcrypt_module_close($td);
	}
	else if (function_exists('des')) {
	$pass = des($this->config->get_des_key(), base64_decode($cypher), 0, 0, NULL);
	}
	else {
	$pass = base64_decode($cypher);
	}

	return preg_replace('/\x00/', '', $pass);
	}


	/**
	* Build a valid URL to this instance of RoundCube
	*
	* @param mixed Either a string with the action or url parameters as key-value pairs
	* @return string Valid application URL
	*/
	public function url($p)
	{
	if (!is_array($p))
	$p = array('_action' => @func_get_arg(0));

	if (!$p['task'] \|\| !in_array($p['task'], rcmail::$main_tasks))
	$p['task'] = $this->task;

	$p['_task'] = $p['task'];
	unset($p['task']);

	$url = './';
	$delm = '?';
	foreach (array_reverse($p) as $par => $val)
	{
	if (!empty($val)) {
	$url .= $delm.urlencode($par).'='.urlencode($val);
	$delm = '&';
	}
	}
	return $url;
	}
	}

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