From 1495ac7913095ae8284c3501b7d4e6dd31a484ec Mon Sep 17 00:00:00 2001
From: alecpl <alec@alec.pl>
Date: Sat, 14 Apr 2012 07:15:28 -0400
Subject: [PATCH] - More public methods, code cleanup

---
 program/include/rcmail.php | 1459 ++++++++++++++++++++++++++++-----------------------------
 1 files changed, 721 insertions(+), 738 deletions(-)

diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index 0eecd8d..bca91e1 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -5,8 +5,12 @@
  | program/include/rcmail.php                                            |
  |                                                                       |
  | This file is part of the Roundcube Webmail client                     |
- | Copyright (C) 2008-2010, Roundcube Dev. - Switzerland                 |
- | Licensed under the GNU GPL                                            |
+ | Copyright (C) 2008-2012, The Roundcube Dev Team                       |
+ | Copyright (C) 2011-2012, Kolab Systems AG                             |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
  |                                                                       |
  | PURPOSE:                                                              |
  |   Application class providing core functions and holding              |
@@ -26,7 +30,7 @@
  *
  * @package Core
  */
-class rcmail
+class rcmail extends rcube
 {
   /**
    * Main tasks.
@@ -34,69 +38,6 @@
    * @var array
    */
   static public $main_tasks = array('mail','settings','addressbook','login','logout','utils','dummy');
-
-  /**
-   * Singleton instace of rcmail
-   *
-   * @var rcmail
-   */
-  static private $instance;
-
-  /**
-   * Stores instance of rcube_config.
-   *
-   * @var rcube_config
-   */
-  public $config;
-
-  /**
-   * Stores rcube_user instance.
-   *
-   * @var rcube_user
-   */
-  public $user;
-
-  /**
-   * Instace of database class.
-   *
-   * @var rcube_mdb2
-   */
-  public $db;
-
-  /**
-   * Instace of rcube_session class.
-   *
-   * @var rcube_session
-   */
-  public $session;
-
-  /**
-   * Instance of rcube_smtp class.
-   *
-   * @var rcube_smtp
-   */
-  public $smtp;
-
-  /**
-   * Instance of rcube_imap class.
-   *
-   * @var rcube_imap
-   */
-  public $imap;
-
-  /**
-   * Instance of rcube_template class.
-   *
-   * @var rcube_template
-   */
-  public $output;
-
-  /**
-   * Instance of rcube_plugin_api.
-   *
-   * @var rcube_plugin_api
-   */
-  public $plugins;
 
   /**
    * Current task.
@@ -113,8 +54,8 @@
   public $action = '';
   public $comm_path = './';
 
-  private $texts;
-  private $books = array();
+  private $address_books = array();
+  private $action_map = array();
 
 
   /**
@@ -124,7 +65,7 @@
    */
   static function get_instance()
   {
-    if (!self::$instance) {
+    if (!self::$instance || !is_a(self::$instance, 'rcmail')) {
       self::$instance = new rcmail();
       self::$instance->startup();  // init AFTER object was linked with self::$instance
     }
@@ -134,34 +75,12 @@
 
 
   /**
-   * 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, $USER
    */
-  private function startup()
+  protected function startup()
   {
-    // initialize syslog
-    if ($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);
-    }
-
-    // connect to database
-    $GLOBALS['DB'] = $this->get_dbh();
+    $this->init(self::INIT_WITH_DB | self::INIT_WITH_PLUGINS);
 
     // start session
     $this->session_init();
@@ -173,8 +92,8 @@
     $this->session_configure();
 
     // set task and action properties
-    $this->set_task(get_input_value('_task', RCUBE_INPUT_GPC));
-    $this->action = asciiwords(get_input_value('_action', RCUBE_INPUT_GPC));
+    $this->set_task(rcube_ui::get_input_value('_task', rcube_ui::INPUT_GPC));
+    $this->action = asciiwords(rcube_ui::get_input_value('_action', rcube_ui::INPUT_GPC));
 
     // reset some session parameters when changing task
     if ($this->task != 'utils') {
@@ -190,11 +109,9 @@
     else
       $GLOBALS['OUTPUT'] = $this->load_gui(!empty($_REQUEST['_framed']));
 
-    // create plugin API and load plugins
-    $this->plugins = rcube_plugin_api::get_instance();
-
-    // init plugins
-    $this->plugins->init();
+    // load plugins
+    $this->plugins->init($this, $this->task);
+    $this->plugins->load_plugins((array)$this->config->get('plugins', array()), array('filesystem_attachments', 'jqueryui'));
   }
 
 
@@ -208,7 +125,7 @@
     $task = asciiwords($task);
 
     if ($this->user && $this->user->ID)
-      $task = !$task || $task == 'login' ? 'mail' : $task;
+      $task = !$task ? 'mail' : $task;
     else
       $task = 'login';
 
@@ -229,7 +146,6 @@
   {
     if (is_object($user)) {
       $this->user = $user;
-      $GLOBALS['USER'] = $this->user;
 
       // overwrite config with user preferences
       $this->config->set_user_prefs((array)$this->user->get_prefs());
@@ -247,111 +163,68 @@
 
 
   /**
-   * 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 $lang;
-  }
-
-
-  /**
-   * Get the current database connection
-   *
-   * @return rcube_mdb2  Database connection object
-   */
-  public function get_dbh()
-  {
-    if (!$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']);
-    }
-
-    return $this->db;
-  }
-
-
-  /**
    * Return instance of the internal address book class
    *
    * @param string  Address book identifier
    * @param boolean True if the address book needs to be writeable
+   *
    * @return rcube_contacts Address book object
    */
   public function get_address_book($id, $writeable = false)
   {
-    $contacts = null;
+    $contacts    = null;
     $ldap_config = (array)$this->config->get('ldap_public');
-    $abook_type = strtolower($this->config->get('address_book_type'));
+    $abook_type  = strtolower($this->config->get('address_book_type'));
 
-    $plugin = $this->plugins->exec_hook('addressbook_get', array('id' => $id, 'writeable' => $writeable));
+    // 'sql' is the alias for '0' used by autocomplete
+    if ($id == 'sql')
+        $id = '0';
 
-    // plugin returned instance of a rcube_addressbook
-    if ($plugin['instance'] instanceof rcube_addressbook) {
-      $contacts = $plugin['instance'];
+    // use existing instance
+    if (isset($this->address_books[$id]) && is_object($this->address_books[$id])
+      && is_a($this->address_books[$id], 'rcube_addressbook')
+      && (!$writeable || !$this->address_books[$id]->readonly)
+    ) {
+      $contacts = $this->address_books[$id];
     }
     else if ($id && $ldap_config[$id]) {
-      $contacts = new rcube_ldap($ldap_config[$id], $this->config->get('ldap_debug'), $this->config->mail_domain($_SESSION['imap_host']));
+      $contacts = new rcube_ldap($ldap_config[$id], $this->config->get('ldap_debug'), $this->config->mail_domain($_SESSION['storage_host']));
     }
     else if ($id === '0') {
-      $contacts = new rcube_contacts($this->db, $this->user->ID);
+      $contacts = new rcube_contacts($this->db, $this->get_user_id());
     }
-    else if ($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, $this->config->get('ldap_debug'), $this->config->mail_domain($_SESSION['imap_host']));
-          break;
+    else {
+      $plugin = $this->plugins->exec_hook('addressbook_get', array('id' => $id, 'writeable' => $writeable));
+
+      // plugin returned instance of a rcube_addressbook
+      if ($plugin['instance'] instanceof rcube_addressbook) {
+        $contacts = $plugin['instance'];
+      }
+      // get first source from the list
+      else if (!$id) {
+        $source = reset($this->get_address_sources($writeable));
+        if (!empty($source)) {
+          $contacts = $this->get_address_book($source['id']);
+          if ($contacts)
+            $id = $source['id'];
         }
       }
     }
-    else { // $id == 'sql'
-      $contacts = new rcube_contacts($this->db, $this->user->ID);
+
+    if (!$contacts) {
+      self::raise_error(array(
+        'code' => 700, 'type' => 'php',
+        'file' => __FILE__, 'line' => __LINE__,
+        'message' => "Addressbook source ($id) not found!"),
+        true, true);
     }
 
+    // set configured sort order
+    if ($sort_col = $this->config->get('addressbook_sort_col'))
+        $contacts->set_sort_order($sort_col);
+
     // add to the 'books' array for shutdown function
-    if (!in_array($contacts, $this->books))
-      $this->books[] = $contacts;
+    $this->address_books[$id] = $contacts;
 
     return $contacts;
   }
@@ -361,6 +234,7 @@
    * Return address books list
    *
    * @param boolean True if the address book needs to be writeable
+   *
    * @return array  Address books array
    */
   public function get_address_sources($writeable = false)
@@ -372,37 +246,46 @@
 
     // We are using the DB address book
     if ($abook_type != 'ldap') {
-      $contacts = new rcube_contacts($this->db, null);
+      if (!isset($this->address_books['0']))
+        $this->address_books['0'] = new rcube_contacts($this->db, $this->get_user_id());
       $list['0'] = array(
-        'id' => 0,
-        'name' => rcube_label('personaladrbook'),
-        'groups' => $contacts->groups,
-        'readonly' => false,
-        'autocomplete' => in_array('sql', $autocomplete)
+        'id'       => '0',
+        'name'     => $this->gettext('personaladrbook'),
+        'groups'   => $this->address_books['0']->groups,
+        'readonly' => $this->address_books['0']->readonly,
+        'autocomplete' => in_array('sql', $autocomplete),
+        'undelete' => $this->address_books['0']->undelete && $this->config->get('undo_timeout'),
       );
     }
 
     if ($ldap_config) {
       $ldap_config = (array) $ldap_config;
-      foreach ($ldap_config as $id => $prop)
+      foreach ($ldap_config as $id => $prop) {
+        // handle misconfiguration
+        if (empty($prop) || !is_array($prop)) {
+          continue;
+        }
         $list[$id] = array(
-          'id' => $id,
-          'name' => $prop['name'],
-          'groups' => false,
+          'id'       => $id,
+          'name'     => $prop['name'],
+          'groups'   => is_array($prop['groups']),
           'readonly' => !$prop['writable'],
-          'autocomplete' => in_array('sql', $autocomplete)
+          'hidden'   => $prop['hidden'],
+          'autocomplete' => in_array($id, $autocomplete)
         );
+      }
     }
 
     $plugin = $this->plugins->exec_hook('addressbooks_list', array('sources' => $list));
     $list = $plugin['sources'];
 
-    if ($writeable && !empty($list)) {
-      foreach ($list as $idx => $item) {
-        if ($item['readonly']) {
+    foreach ($list as $idx => $item) {
+      // register source for shutdown function
+      if (!is_object($this->address_books[$item['id']]))
+        $this->address_books[$item['id']] = $item;
+      // remove from list if not writeable as requested
+      if ($writeable && $item['readonly'])
           unset($list[$idx]);
-        }
-      }
     }
 
     return $list;
@@ -415,13 +298,13 @@
    * environment vars according to the current session and configuration
    *
    * @param boolean True if this request is loaded in a (i)frame
-   * @return rcube_template Reference to HTML output object
+   * @return rcube_output_html Reference to HTML output object
    */
   public function load_gui($framed = false)
   {
     // init output page
-    if (!($this->output instanceof rcube_template))
-      $this->output = new rcube_template($this->task, $framed);
+    if (!($this->output instanceof rcube_output_html))
+      $this->output = new rcube_output_html($this->task, $framed);
 
     // set keep-alive/check-recent interval
     if ($this->session && ($keep_alive = $this->session->get_keep_alive())) {
@@ -438,7 +321,7 @@
     $this->output->set_env('comm_path', $this->comm_path);
     $this->output->set_charset(RCMAIL_CHARSET);
 
-    // add some basic label to client
+    // add some basic labels to client
     $this->output->add_label('loading', 'servererror');
 
     return $this->output;
@@ -448,109 +331,14 @@
   /**
    * Create an output object for JSON responses
    *
-   * @return rcube_json_output Reference to JSON output object
+   * @return rcube_output_json Reference to JSON output object
    */
   public function json_init()
   {
-    if (!($this->output instanceof rcube_json_output))
-      $this->output = new rcube_json_output($this->task);
+    if (!($this->output instanceof rcube_output_json))
+      $this->output = new rcube_output_json($this->task);
 
     return $this->output;
-  }
-
-
-  /**
-   * Create SMTP object and connect to server
-   *
-   * @param boolean True if connection should be established
-   */
-  public function smtp_init($connect = false)
-  {
-    $this->smtp = new rcube_smtp();
-
-    if ($connect)
-      $this->smtp->connect();
-  }
-
-
-  /**
-   * 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)
-  {
-    // already initialized
-    if (is_object($this->imap))
-      return;
-
-    $this->imap = new rcube_imap($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));
-
-    // Setting root and delimiter before establishing the connection
-    // can save time detecting them using NAMESPACE and LIST
-    $options = array(
-      'auth_method' => $this->config->get('imap_auth_type', 'check'),
-      'auth_cid'    => $this->config->get('imap_auth_cid'),
-      'auth_pw'     => $this->config->get('imap_auth_pw'),
-      'debug_mode'  => (bool) $this->config->get('imap_debug', 0),
-      'force_caps'  => (bool) $this->config->get('imap_force_caps'),
-      'timeout'     => (int) $this->config->get('imap_timeout', 0),
-    );
-
-    $this->imap->set_options($options);
-
-    // set global object for backward compatibility
-    $GLOBALS['IMAP'] = $this->imap;
-
-    $hook = $this->plugins->exec_hook('imap_init', array('fetch_headers' => $this->imap->fetch_add_headers));
-    if ($hook['fetch_headers'])
-      $this->imap->fetch_add_headers = $hook['fetch_headers'];
-
-    // support this parameter for backward compatibility but log warning
-    if ($connect) {
-      $this->imap_connect();
-      raise_error(array(
-        'code' => 800, 'type' => 'imap',
-        'file' => __FILE__, 'line' => __LINE__,
-        'message' => "rcube::imap_init(true) is deprecated, use rcube::imap_connect() instead"),
-        true, false);
-    }
-  }
-
-
-  /**
-   * Connect to IMAP server with stored session data
-   *
-   * @return bool True on success, false on error
-   */
-  public function imap_connect()
-  {
-    if (!$this->imap)
-      $this->imap_init();
-
-    if ($_SESSION['imap_host'] && !$this->imap->conn->connected()) {
-      if (!$this->imap->connect($_SESSION['imap_host'], $_SESSION['username'], $this->decrypt($_SESSION['password']), $_SESSION['imap_port'], $_SESSION['imap_ssl'])) {
-        if ($this->output)
-          $this->output->show_message($this->imap->get_error_code() == -1 ? 'imaperror' : 'sessionerror', 'error');
-      }
-      else {
-        $this->set_imap_prop();
-        return $this->imap->conn;
-      }
-    }
-
-    return false;
   }
 
 
@@ -563,39 +351,42 @@
     if (session_id())
       return;
 
-    $lifetime = $this->config->get('session_lifetime', 0) * 60;
+    $sess_name   = $this->config->get('session_name');
+    $sess_domain = $this->config->get('session_domain');
+    $lifetime    = $this->config->get('session_lifetime', 0) * 60;
 
     // set session domain
-    if ($domain = $this->config->get('session_domain')) {
-      ini_set('session.cookie_domain', $domain);
+    if ($sess_domain) {
+      ini_set('session.cookie_domain', $sess_domain);
     }
     // set session garbage collecting time according to session_lifetime
     if ($lifetime) {
       ini_set('session.gc_maxlifetime', $lifetime * 2);
     }
 
-    ini_set('session.cookie_secure', rcube_https_check());
-    ini_set('session.name', 'roundcube_sessid');
+    ini_set('session.cookie_secure', rcube_ui::https_check());
+    ini_set('session.name', $sess_name ? $sess_name : 'roundcube_sessid');
     ini_set('session.use_cookies', 1);
     ini_set('session.use_only_cookies', 1);
     ini_set('session.serialize_handler', 'php');
 
     // use database for storing session data
-    $this->session = new rcube_session($this->get_dbh(), $lifetime);
+    $this->session = new rcube_session($this->get_dbh(), $this->config);
 
-    $this->session->register_gc_handler('rcmail_temp_gc');
-    if ($this->config->get('enable_caching'))
-      $this->session->register_gc_handler('rcmail_cache_gc');
+    $this->session->register_gc_handler(array($this, 'temp_gc'));
+    $this->session->register_gc_handler(array($this, 'cache_gc'));
 
     // start PHP session (if not in CLI mode)
     if ($_SERVER['REMOTE_ADDR'])
       session_start();
 
     // set initial session vars
-    if (!isset($_SESSION['auth_time'])) {
-      $_SESSION['auth_time'] = time();
+    if (!$_SESSION['user_id'])
       $_SESSION['temp'] = true;
-    }
+
+    // restore skin selection after logout
+    if ($_SESSION['temp'] && !empty($_SESSION['skin']))
+      $this->config->set('skin', $_SESSION['skin']);
   }
 
 
@@ -617,21 +408,28 @@
       $keep_alive = max(60, $keep_alive);
       $this->session->set_keep_alive($keep_alive);
     }
+
+    $this->session->set_secret($this->config->get('des_key') . $_SERVER['HTTP_USER_AGENT']);
+    $this->session->set_ip_check($this->config->get('ip_check'));
   }
 
 
   /**
-   * Perfom login to the IMAP server and to the webmail service.
+   * Perfom login to the mail 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
+   * @param string Mail storage (IMAP) user name
+   * @param string Mail storage (IMAP) password
+   * @param string Mail storage (IMAP) host
+   *
    * @return boolean True on success, False on failure
    */
   function login($username, $pass, $host=NULL)
   {
-    $user = NULL;
+    if (empty($username)) {
+      return false;
+    }
+
     $config = $this->config->all();
 
     if (!$host)
@@ -651,21 +449,23 @@
       if (!$allowed)
         return false;
       }
-    else if (!empty($config['default_host']) && $host != rcube_parse_host($config['default_host']))
+    else if (!empty($config['default_host']) && $host != self::parse_host($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;
+      $ssl = (isset($a_host['scheme']) && in_array($a_host['scheme'], array('ssl','imaps','tls'))) ? $a_host['scheme'] : null;
       if (!empty($a_host['port']))
-        $imap_port = $a_host['port'];
-      else if ($imap_ssl && $imap_ssl != 'tls' && (!$config['default_port'] || $config['default_port'] == 143))
-        $imap_port = 993;
+        $port = $a_host['port'];
+      else if ($ssl && $ssl != 'tls' && (!$config['default_port'] || $config['default_port'] == 143))
+        $port = 993;
     }
 
-    $imap_port = $imap_port ? $imap_port : $config['default_port'];
+    if (!$port) {
+        $port = $config['default_port'];
+    }
 
     /* Modify username with domain if required
        Inspired by Marco <P0L0_notspam_binware.org>
@@ -673,12 +473,12 @@
     // Check if we need to add domain
     if (!empty($config['username_domain']) && strpos($username, '@') === false) {
       if (is_array($config['username_domain']) && isset($config['username_domain'][$host]))
-        $username .= '@'.rcube_parse_host($config['username_domain'][$host]);
+        $username .= '@'.self::parse_host($config['username_domain'][$host], $host);
       else if (is_string($config['username_domain']))
-        $username .= '@'.rcube_parse_host($config['username_domain']);
+        $username .= '@'.self::parse_host($config['username_domain'], $host);
     }
 
-    // Convert username to lowercase. If IMAP backend
+    // Convert username to lowercase. If storage backend
     // is case-insensitive we need to store always the same username (#1487113)
     if ($config['login_lc']) {
       $username = mb_strtolower($username);
@@ -691,23 +491,23 @@
 
     // Here we need IDNA ASCII
     // Only rcube_contacts class is using domain names in Unicode
-    $host = idn_to_ascii($host);
+    $host = rcube_idn_to_ascii($host);
     if (strpos($username, '@')) {
       // lowercase domain name
       list($local, $domain) = explode('@', $username);
       $username = $local . '@' . mb_strtolower($domain);
-      $username = idn_to_ascii($username);
+      $username = rcube_idn_to_ascii($username);
     }
 
     // user already registered -> overwrite username
     if ($user = rcube_user::query($username, $host))
       $username = $user->data['username'];
 
-    if (!$this->imap)
-      $this->imap_init();
+    if (!$this->storage)
+      $this->storage_init();
 
-    // try IMAP login
-    if (!($imap_login = $this->imap->connect($host, $username, $pass, $imap_port, $imap_ssl))) {
+    // try to log in
+    if (!($login = $this->storage->connect($host, $username, $pass, $port, $ssl))) {
       // try with lowercase
       $username_lc = mb_strtolower($username);
       if ($username_lc != $username) {
@@ -715,91 +515,78 @@
         if (!$user && ($user = rcube_user::query($username_lc, $host)))
           $username_lc = $user->data['username'];
 
-        if ($imap_login = $this->imap->connect($host, $username_lc, $pass, $imap_port, $imap_ssl))
+        if ($login = $this->storage->connect($host, $username_lc, $pass, $port, $ssl))
           $username = $username_lc;
       }
     }
 
-    // exit if IMAP login failed
-    if (!$imap_login)
+    // exit if login failed
+    if (!$login) {
       return false;
-
-    $this->set_imap_prop();
+    }
 
     // user already registered -> update user's record
     if (is_object($user)) {
-      // create default folders on first login
-      if (!$user->data['last_login'] && $config['create_default_folders'])
-        $this->imap->create_default_folders();
+      // update last login timestamp
       $user->touch();
     }
     // create new system user
     else if ($config['auto_create_user']) {
       if ($created = rcube_user::create($username, $host)) {
         $user = $created;
-        // create default folders on first login
-        if ($config['create_default_folders'])
-          $this->imap->create_default_folders();
       }
       else {
-        raise_error(array(
-          'code' => 600, 'type' => 'php',
+        self::raise_error(array(
+          'code' => 620, 'type' => 'php',
           'file' => __FILE__, 'line' => __LINE__,
           'message' => "Failed to create a user record. Maybe aborted by a plugin?"
           ), true, false);
       }
     }
     else {
-      raise_error(array(
-        'code' => 600, 'type' => 'php',
+      self::raise_error(array(
+        'code' => 621, 'type' => 'php',
         'file' => __FILE__, 'line' => __LINE__,
-        'message' => "Acces denied for new user $username. 'auto_create_user' is disabled"
+        'message' => "Access denied for new user $username. 'auto_create_user' is disabled"
         ), true, false);
     }
 
     // login succeeded
     if (is_object($user) && $user->ID) {
+      // Configure environment
       $this->set_user($user);
+      $this->set_storage_prop();
+      $this->session_configure();
+
+      // fix some old settings according to namespace prefix
+      $this->fix_namespace_settings($user);
+
+      // create default folders on first login
+      if ($config['create_default_folders'] && (!empty($created) || empty($user->data['last_login']))) {
+        $this->storage->create_default_folders();
+      }
 
       // 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']  = $this->encrypt($pass);
-      $_SESSION['login_time'] = mktime();
+      $_SESSION['user_id']      = $user->ID;
+      $_SESSION['username']     = $user->data['username'];
+      $_SESSION['storage_host'] = $host;
+      $_SESSION['storage_port'] = $port;
+      $_SESSION['storage_ssl']  = $ssl;
+      $_SESSION['password']     = $this->encrypt($pass);
+      $_SESSION['login_time']   = mktime();
 
       if (isset($_REQUEST['_timezone']) && $_REQUEST['_timezone'] != '_default_')
         $_SESSION['timezone'] = floatval($_REQUEST['_timezone']);
+      if (isset($_REQUEST['_dstactive']) && $_REQUEST['_dstactive'] != '_default_')
+        $_SESSION['dst_active'] = intval($_REQUEST['_dstactive']);
 
       // force reloading complete list of subscribed mailboxes
-      $this->imap->clear_cache('mailboxes');
+      $this->storage->clear_cache('mailboxes', true);
 
       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));
-
-    if ($default_folders = $this->config->get('default_imap_folders')) {
-      $this->imap->set_default_mailboxes($default_folders);
-    }
-    if (isset($_SESSION['mbox'])) {
-      $this->imap->set_mailbox($_SESSION['mbox']);
-    }
-    if (isset($_SESSION['page'])) {
-      $this->imap->set_page($_SESSION['page']);
-    }
   }
 
 
@@ -814,7 +601,7 @@
     $host = null;
 
     if (is_array($default_host)) {
-      $post_host = get_input_value('_host', RCUBE_INPUT_POST);
+      $post_host = rcube_ui::get_input_value('_host', rcube_ui::INPUT_POST);
 
       // direct match in default_host array
       if ($default_host[$post_host] || in_array($post_host, array_values($default_host))) {
@@ -822,202 +609,33 @@
       }
 
       // try to select host by mail domain
-      list($user, $domain) = explode('@', get_input_value('_user', RCUBE_INPUT_POST));
+      list($user, $domain) = explode('@', rcube_ui::get_input_value('_user', rcube_ui::INPUT_POST));
       if (!empty($domain)) {
-        foreach ($default_host as $imap_host => $mail_domains) {
-          if (is_array($mail_domains) && in_array($domain, $mail_domains)) {
-            $host = $imap_host;
+        foreach ($default_host as $storage_host => $mail_domains) {
+          if (is_array($mail_domains) && in_array_nocase($domain, $mail_domains)) {
+            $host = $storage_host;
+            break;
+          }
+          else if (stripos($storage_host, $domain) !== false || stripos(strval($mail_domains), $domain) !== false) {
+            $host = is_numeric($storage_host) ? $mail_domains : $storage_host;
             break;
           }
         }
       }
 
-      // take the first entry if $host is still an array
+      // take the first entry if $host is still not set
       if (empty($host)) {
-        $host = array_shift($default_host);
+        list($key, $val) = each($default_host);
+        $host = is_numeric($key) ? $val : $key;
       }
     }
     else if (empty($default_host)) {
-      $host = get_input_value('_host', RCUBE_INPUT_POST);
+      $host = rcube_ui::get_input_value('_host', rcube_ui::INPUT_POST);
     }
     else
-      $host = rcube_parse_host($default_host);
+      $host = self::parse_host($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, $domain=null)
-  {
-    // load localization files if not done yet
-    if (empty($this->texts))
-      $this->load_language();
-
-    // extract attributes
-    if (is_string($attrib))
-      $attrib = array('name' => $attrib);
-
-    $nr = is_numeric($attrib['nr']) ? $attrib['nr'] : 1;
-    $name = $attrib['name'] ? $attrib['name'] : '';
-
-    // check for text with domain
-    if ($domain && ($text_item = $this->texts[$domain.'.'.$name]))
-      ;
-    // text does not exist
-    else if (!($text_item = $this->texts[$name])) {
-      return "[$name]";
-    }
-
-    // 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)
-        $text = str_replace($var_key[0]!='$' ? '$'.$var_key : $var_key, $var_value, $text);
-    }
-
-    // format output
-    if (($attrib['uppercase'] && strtolower($attrib['uppercase']=='first')) || $attrib['ucfirst'])
-      return ucfirst($text);
-    else if ($attrib['uppercase'])
-      return mb_strtoupper($text);
-    else if ($attrib['lowercase'])
-      return mb_strtolower($text);
-
-    return $text;
-  }
-
-
-  /**
-   * Load a localization package
-   *
-   * @param string Language ID
-   */
-  public function load_language($lang = null, $add = array())
-  {
-    $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'] = $lang;
-    }
-
-    // append additional texts (from plugin)
-    if (is_array($add) && !empty($add))
-      $this->texts += $add;
-  }
-
-
-  /**
-   * 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] = $label;
-        }
-        closedir($dh);
-      }
-    }
-
-    return $sa_languages;
-  }
-
-
-  /**
-   * Check the auth hash sent by the client against the local session credentials
-   *
-   * @return boolean True if valid, False if not
-   */
-  function authenticate_session()
-  {
-    // advanced session authentication
-    if ($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;
-        rcmail::setcookie('sessauth', $this->get_auth_hash(session_id(), $now), 0);
-      }
-    }
-    else {
-      $valid = $this->config->get('ip_check') ? $_SERVER['REMOTE_ADDR'] == $this->session->get_ip() : true;
-    }
-
-    // check session filetime
-    $lifetime = $this->config->get('session_lifetime');
-    $sess_ts = $this->session->get_ts();
-    if (!empty($lifetime) && !empty($sess_ts) && $sess_ts + $lifetime*60 < time()) {
-      $valid = false;
-    }
-
-    return $valid;
   }
 
 
@@ -1028,9 +646,8 @@
   {
     $this->plugins->exec_hook('session_destroy');
 
-    $this->session->remove();
-    $_SESSION = array('language' => $this->user->language, 'auth_time' => time(), 'temp' => true);
-    rcmail::setcookie('sessauth', '-del-', time() - 60);
+    $this->session->kill();
+    $_SESSION = array('language' => $this->user->language, 'temp' => true, 'skin' => $this->config->get('skin'));
     $this->user->reset();
   }
 
@@ -1044,55 +661,36 @@
 
     // 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())
+      if (!$this->session->check_auth())
         return;
 
-      $this->imap_connect();
+      $this->storage_connect();
     }
 
     if ($config['logout_purge'] && !empty($config['trash_mbox'])) {
-      $this->imap->clear_mailbox($config['trash_mbox']);
+      $this->storage->clear_folder($config['trash_mbox']);
     }
 
     if ($config['logout_expunge']) {
-      $this->imap->expunge('INBOX');
+      $this->storage->expunge_folder('INBOX');
+    }
+
+    // Try to save unsaved user preferences
+    if (!empty($_SESSION['preferences'])) {
+      $this->user->save_prefs(unserialize($_SESSION['preferences']));
     }
   }
 
 
   /**
-   * Function to be executed in script shutdown
-   * Registered with register_shutdown_function()
+   * Garbage collector for cache entries.
+   * Set flag to expunge caches on shutdown
    */
-  public function shutdown()
+  function cache_gc()
   {
-    if (is_object($this->imap))
-      $this->imap->close();
-
-    if (is_object($this->smtp))
-      $this->smtp->disconnect();
-
-    foreach ($this->books as $book)
-      if (is_object($book))
-        $book->close();
-
-    // before closing the database connection, write session data
-    if ($_SERVER['REMOTE_ADDR'])
-      session_write_close();
-
-    // write performance stats to logs/console
-    if ($this->config->get('devel_mode')) {
-      if (function_exists('memory_get_usage'))
-        $mem = show_bytes(memory_get_usage());
-      if (function_exists('memory_get_peak_usage'))
-        $mem .= '/'.show_bytes(memory_get_peak_usage());
-
-      $log = $this->task . ($this->action ? '/'.$this->action : '') . ($mem ? " [$mem]" : '');
-      if (defined('RCMAIL_START'))
-        rcube_print_time(RCMAIL_START, $log);
-      else
-        console($log);
-    }
+    // because this gc function is called before storage is initialized,
+    // we just set a flag to expunge storage cache on shutdown.
+    $this->expunge_cache = true;
   }
 
 
@@ -1103,12 +701,10 @@
    */
   public function get_request_token()
   {
-    $key = $this->task;
-
-    if (!$_SESSION['request_tokens'][$key])
-      $_SESSION['request_tokens'][$key] = md5(uniqid($key . mt_rand(), true));
-
-    return $_SESSION['request_tokens'][$key];
+    $sess_id = $_COOKIE[ini_get('session.name')];
+    if (!$sess_id) $sess_id = session_id();
+    $plugin = $this->plugins->exec_hook('request_token', array('value' => md5('RT' . $this->get_user_id() . $this->config->get('des_key') . $sess_id)));
+    return $plugin['value'];
   }
 
 
@@ -1118,10 +714,11 @@
    * @param int Request method
    * @return boolean True if request token is valid false if not
    */
-  public function check_request($mode = RCUBE_INPUT_POST)
+  public function check_request($mode = rcube_ui::INPUT_POST)
   {
-    $token = get_input_value('_token', $mode);
-    return !empty($token) && $_SESSION['request_tokens'][$this->task] == $token;
+    $token = rcube_ui::get_input_value('_token', $mode);
+    $sess_id = $_COOKIE[ini_get('session.name')];
+    return !empty($sess_id) && $token == $this->get_request_token();
   }
 
 
@@ -1148,130 +745,6 @@
 
 
   /**
-   * Encrypt using 3DES
-   *
-   * @param string $clear clear text input
-   * @param string $key encryption key to retrieve from the configuration, defaults to 'des_key'
-   * @param boolean $base64 whether or not to base64_encode() the result before returning
-   *
-   * @return string encrypted text
-   */
-  public function encrypt($clear, $key = 'des_key', $base64 = true)
-  {
-    if (!$clear)
-      return '';
-    /*-
-     * Add a single canary byte to the end of the clear text, which
-     * will help find out how much of padding will need to be removed
-     * upon decryption; see http://php.net/mcrypt_generic#68082
-     */
-    $clear = pack("a*H2", $clear, "80");
-
-    if (function_exists('mcrypt_module_open') &&
-        ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, "")))
-    {
-      $iv = $this->create_iv(mcrypt_enc_get_iv_size($td));
-      mcrypt_generic_init($td, $this->config->get_crypto_key($key), $iv);
-      $cipher = $iv . mcrypt_generic($td, $clear);
-      mcrypt_generic_deinit($td);
-      mcrypt_module_close($td);
-    }
-    else {
-      @include_once('lib/des.inc');
-
-      if (function_exists('des')) {
-        $des_iv_size = 8;
-        $iv = $this->create_iv($des_iv_size);
-        $cipher = $iv . des($this->config->get_crypto_key($key), $clear, 1, 1, $iv);
-      }
-      else {
-        raise_error(array(
-          'code' => 500, 'type' => 'php',
-          'file' => __FILE__, 'line' => __LINE__,
-          'message' => "Could not perform encryption; make sure Mcrypt is installed or lib/des.inc is available"
-        ), true, true);
-      }
-    }
-
-    return $base64 ? base64_encode($cipher) : $cipher;
-  }
-
-  /**
-   * Decrypt 3DES-encrypted string
-   *
-   * @param string $cipher encrypted text
-   * @param string $key encryption key to retrieve from the configuration, defaults to 'des_key'
-   * @param boolean $base64 whether or not input is base64-encoded
-   *
-   * @return string decrypted text
-   */
-  public function decrypt($cipher, $key = 'des_key', $base64 = true)
-  {
-    if (!$cipher)
-      return '';
-
-    $cipher = $base64 ? base64_decode($cipher) : $cipher;
-
-    if (function_exists('mcrypt_module_open') &&
-        ($td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_CBC, "")))
-    {
-      $iv_size = mcrypt_enc_get_iv_size($td);
-      $iv = substr($cipher, 0, $iv_size);
-
-      // session corruption? (#1485970)
-      if (strlen($iv) < $iv_size)
-        return '';
-
-      $cipher = substr($cipher, $iv_size);
-      mcrypt_generic_init($td, $this->config->get_crypto_key($key), $iv);
-      $clear = mdecrypt_generic($td, $cipher);
-      mcrypt_generic_deinit($td);
-      mcrypt_module_close($td);
-    }
-    else {
-      @include_once('lib/des.inc');
-
-      if (function_exists('des')) {
-        $des_iv_size = 8;
-        $iv = substr($cipher, 0, $des_iv_size);
-        $cipher = substr($cipher, $des_iv_size);
-        $clear = des($this->config->get_crypto_key($key), $cipher, 0, 1, $iv);
-      }
-      else {
-        raise_error(array(
-          'code' => 500, 'type' => 'php',
-          'file' => __FILE__, 'line' => __LINE__,
-          'message' => "Could not perform decryption; make sure Mcrypt is installed or lib/des.inc is available"
-        ), true, true);
-      }
-    }
-
-    /*-
-     * Trim PHP's padding and the canary byte; see note in
-     * rcmail::encrypt() and http://php.net/mcrypt_generic#68082
-     */
-    $clear = substr(rtrim($clear, "\0"), 0, -1);
-
-    return $clear;
-  }
-
-  /**
-   * Generates encryption initialization vector (IV)
-   *
-   * @param int Vector size
-   * @return string Vector string
-   */
-  private function create_iv($size)
-  {
-    // mcrypt_create_iv() can be slow when system lacks entrophy
-    // we'll generate IV vector manually
-    $iv = '';
-    for ($i = 0; $i < $size; $i++)
-        $iv .= chr(mt_rand(0, 255));
-    return $iv;
-  }
-
-  /**
    * Build a valid URL to this instance of Roundcube
    *
    * @param mixed Either a string with the action or url parameters as key-value pairs
@@ -1288,9 +761,8 @@
 
     $url = './';
     $delm = '?';
-    foreach (array_reverse($p) as $key => $val)
-    {
-      if (!empty($val)) {
+    foreach (array_reverse($p) as $key => $val) {
+      if ($val !== '' && $val !== null) {
         $par = $key[0] == '_' ? $key : '_'.$key;
         $url .= $delm.urlencode($par).'='.urlencode($val);
         $delm = '&';
@@ -1299,6 +771,38 @@
     return $url;
   }
 
+
+  /**
+   * Function to be executed in script shutdown
+   */
+  public function shutdown()
+  {
+    parent::shutdown();
+
+    foreach ($this->address_books as $book) {
+      if (is_object($book) && is_a($book, 'rcube_addressbook'))
+        $book->close();
+    }
+
+    // before closing the database connection, write session data
+    if ($_SERVER['REMOTE_ADDR'] && is_object($this->session)) {
+      session_write_close();
+    }
+
+    // write performance stats to logs/console
+    if ($this->config->get('devel_mode')) {
+      if (function_exists('memory_get_usage'))
+        $mem = rcube_ui::show_bytes(memory_get_usage());
+      if (function_exists('memory_get_peak_usage'))
+        $mem .= '/'.rcube_ui::show_bytes(memory_get_peak_usage());
+
+      $log = $this->task . ($this->action ? '/'.$this->action : '') . ($mem ? " [$mem]" : '');
+      if (defined('RCMAIL_START'))
+        self::print_timer(RCMAIL_START, $log);
+      else
+        self::console($log);
+    }
+  }
 
   /**
    * Helper method to set a cookie with the current path and host settings
@@ -1315,8 +819,487 @@
     $cookie = session_get_cookie_params();
 
     setcookie($name, $value, $exp, $cookie['path'], $cookie['domain'],
-      rcube_https_check(), true);
+      rcube_ui::https_check(), true);
   }
+
+  /**
+   * Registers action aliases for current task
+   *
+   * @param array $map Alias-to-filename hash array
+   */
+  public function register_action_map($map)
+  {
+    if (is_array($map)) {
+      foreach ($map as $idx => $val) {
+        $this->action_map[$idx] = $val;
+      }
+    }
+  }
+
+  /**
+   * Returns current action filename
+   *
+   * @param array $map Alias-to-filename hash array
+   */
+  public function get_action_file()
+  {
+    if (!empty($this->action_map[$this->action])) {
+      return $this->action_map[$this->action];
+    }
+
+    return strtr($this->action, '-', '_') . '.inc';
+  }
+
+  /**
+   * Fixes some user preferences according to namespace handling change.
+   * Old Roundcube versions were using folder names with removed namespace prefix.
+   * Now we need to add the prefix on servers where personal namespace has prefix.
+   *
+   * @param rcube_user $user User object
+   */
+  private function fix_namespace_settings($user)
+  {
+    $prefix     = $this->storage->get_namespace('prefix');
+    $prefix_len = strlen($prefix);
+
+    if (!$prefix_len)
+      return;
+
+    $prefs = $this->config->all();
+    if (!empty($prefs['namespace_fixed']))
+      return;
+
+    // Build namespace prefix regexp
+    $ns     = $this->storage->get_namespace();
+    $regexp = array();
+
+    foreach ($ns as $entry) {
+      if (!empty($entry)) {
+        foreach ($entry as $item) {
+          if (strlen($item[0])) {
+            $regexp[] = preg_quote($item[0], '/');
+          }
+        }
+      }
+    }
+    $regexp = '/^('. implode('|', $regexp).')/';
+
+    // Fix preferences
+    $opts = array('drafts_mbox', 'junk_mbox', 'sent_mbox', 'trash_mbox', 'archive_mbox');
+    foreach ($opts as $opt) {
+      if ($value = $prefs[$opt]) {
+        if ($value != 'INBOX' && !preg_match($regexp, $value)) {
+          $prefs[$opt] = $prefix.$value;
+        }
+      }
+    }
+
+    if (!empty($prefs['default_folders'])) {
+      foreach ($prefs['default_folders'] as $idx => $name) {
+        if ($name != 'INBOX' && !preg_match($regexp, $name)) {
+          $prefs['default_folders'][$idx] = $prefix.$name;
+        }
+      }
+    }
+
+    if (!empty($prefs['search_mods'])) {
+      $folders = array();
+      foreach ($prefs['search_mods'] as $idx => $value) {
+        if ($idx != 'INBOX' && $idx != '*' && !preg_match($regexp, $idx)) {
+          $idx = $prefix.$idx;
+        }
+        $folders[$idx] = $value;
+      }
+      $prefs['search_mods'] = $folders;
+    }
+
+    if (!empty($prefs['message_threading'])) {
+      $folders = array();
+      foreach ($prefs['message_threading'] as $idx => $value) {
+        if ($idx != 'INBOX' && !preg_match($regexp, $idx)) {
+          $idx = $prefix.$idx;
+        }
+        $folders[$prefix.$idx] = $value;
+      }
+      $prefs['message_threading'] = $folders;
+    }
+
+    if (!empty($prefs['collapsed_folders'])) {
+      $folders     = explode('&&', $prefs['collapsed_folders']);
+      $count       = count($folders);
+      $folders_str = '';
+
+      if ($count) {
+          $folders[0]        = substr($folders[0], 1);
+          $folders[$count-1] = substr($folders[$count-1], 0, -1);
+      }
+
+      foreach ($folders as $value) {
+        if ($value != 'INBOX' && !preg_match($regexp, $value)) {
+          $value = $prefix.$value;
+        }
+        $folders_str .= '&'.$value.'&';
+      }
+      $prefs['collapsed_folders'] = $folders_str;
+    }
+
+    $prefs['namespace_fixed'] = true;
+
+    // save updated preferences and reset imap settings (default folders)
+    $user->save_prefs($prefs);
+    $this->set_storage_prop();
+  }
+
+
+    /**
+     * Overwrite action variable
+     *
+     * @param string New action value
+     */
+    public function overwrite_action($action)
+    {
+        $this->action = $action;
+        $this->output->set_env('action', $action);
+    }
+
+
+    /**
+     * Send the given message using the configured method.
+     *
+     * @param object $message    Reference to Mail_MIME object
+     * @param string $from       Sender address string
+     * @param array  $mailto     Array of recipient address strings
+     * @param array  $smtp_error SMTP error array (reference)
+     * @param string $body_file  Location of file with saved message body (reference),
+     *                           used when delay_file_io is enabled
+     * @param array  $smtp_opts  SMTP options (e.g. DSN request)
+     *
+     * @return boolean Send status.
+     */
+    public function deliver_message(&$message, $from, $mailto, &$smtp_error, &$body_file = null, $smtp_opts = null)
+    {
+        $headers = $message->headers();
+
+        // send thru SMTP server using custom SMTP library
+        if ($this->config->get('smtp_server')) {
+            // generate list of recipients
+            $a_recipients = array($mailto);
+
+            if (strlen($headers['Cc']))
+                $a_recipients[] = $headers['Cc'];
+            if (strlen($headers['Bcc']))
+                $a_recipients[] = $headers['Bcc'];
+
+            // clean Bcc from header for recipients
+            $send_headers = $headers;
+            unset($send_headers['Bcc']);
+            // here too, it because txtHeaders() below use $message->_headers not only $send_headers
+            unset($message->_headers['Bcc']);
+
+            $smtp_headers = $message->txtHeaders($send_headers, true);
+
+            if ($message->getParam('delay_file_io')) {
+                // use common temp dir
+                $temp_dir = $this->config->get('temp_dir');
+                $body_file = tempnam($temp_dir, 'rcmMsg');
+                if (PEAR::isError($mime_result = $message->saveMessageBody($body_file))) {
+                    self::raise_error(array('code' => 650, 'type' => 'php',
+                        'file' => __FILE__, 'line' => __LINE__,
+                        'message' => "Could not create message: ".$mime_result->getMessage()),
+                        TRUE, FALSE);
+                    return false;
+                }
+                $msg_body = fopen($body_file, 'r');
+            }
+            else {
+                $msg_body = $message->get();
+            }
+
+            // send message
+            if (!is_object($this->smtp)) {
+                $this->smtp_init(true);
+            }
+
+            $sent = $this->smtp->send_mail($from, $a_recipients, $smtp_headers, $msg_body, $smtp_opts);
+            $smtp_response = $this->smtp->get_response();
+            $smtp_error = $this->smtp->get_error();
+
+            // log error
+            if (!$sent) {
+                self::raise_error(array('code' => 800, 'type' => 'smtp',
+                    'line' => __LINE__, 'file' => __FILE__,
+                    'message' => "SMTP error: ".join("\n", $smtp_response)), TRUE, FALSE);
+            }
+        }
+        // send mail using PHP's mail() function
+        else {
+            // unset some headers because they will be added by the mail() function
+            $headers_enc = $message->headers($headers);
+            $headers_php = $message->_headers;
+            unset($headers_php['To'], $headers_php['Subject']);
+
+            // reset stored headers and overwrite
+            $message->_headers = array();
+            $header_str = $message->txtHeaders($headers_php);
+
+            // #1485779
+            if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
+                if (preg_match_all('/<([^@]+@[^>]+)>/', $headers_enc['To'], $m)) {
+                    $headers_enc['To'] = implode(', ', $m[1]);
+                }
+            }
+
+            $msg_body = $message->get();
+
+            if (PEAR::isError($msg_body)) {
+                self::raise_error(array('code' => 650, 'type' => 'php',
+                    'file' => __FILE__, 'line' => __LINE__,
+                    'message' => "Could not create message: ".$msg_body->getMessage()),
+                    TRUE, FALSE);
+            }
+            else {
+                $delim   = $this->config->header_delimiter();
+                $to      = $headers_enc['To'];
+                $subject = $headers_enc['Subject'];
+                $header_str = rtrim($header_str);
+
+                if ($delim != "\r\n") {
+                    $header_str = str_replace("\r\n", $delim, $header_str);
+                    $msg_body   = str_replace("\r\n", $delim, $msg_body);
+                    $to         = str_replace("\r\n", $delim, $to);
+                    $subject    = str_replace("\r\n", $delim, $subject);
+                }
+
+                if (ini_get('safe_mode'))
+                    $sent = mail($to, $subject, $msg_body, $header_str);
+                else
+                    $sent = mail($to, $subject, $msg_body, $header_str, "-f$from");
+            }
+        }
+
+        if ($sent) {
+            $this->plugins->exec_hook('message_sent', array('headers' => $headers, 'body' => $msg_body));
+
+            // remove MDN headers after sending
+            unset($headers['Return-Receipt-To'], $headers['Disposition-Notification-To']);
+
+            // get all recipients
+            if ($headers['Cc'])
+                $mailto .= $headers['Cc'];
+            if ($headers['Bcc'])
+                $mailto .= $headers['Bcc'];
+            if (preg_match_all('/<([^@]+@[^>]+)>/', $mailto, $m))
+                $mailto = implode(', ', array_unique($m[1]));
+
+            if ($this->config->get('smtp_log')) {
+                self::write_log('sendmail', sprintf("User %s [%s]; Message for %s; %s",
+                    $this->user->get_username(),
+                    $_SERVER['REMOTE_ADDR'],
+                    $mailto,
+                    !empty($smtp_response) ? join('; ', $smtp_response) : ''));
+            }
+        }
+
+        if (is_resource($msg_body)) {
+            fclose($msg_body);
+        }
+
+        $message->_headers = array();
+        $message->headers($headers);
+
+        return $sent;
+    }
+
+
+    /**
+     * Unique Message-ID generator.
+     *
+     * @return string Message-ID
+     */
+    public function gen_message_id()
+    {
+        $local_part  = md5(uniqid('rcmail'.mt_rand(),true));
+        $domain_part = $this->user->get_username('domain');
+
+        // Try to find FQDN, some spamfilters doesn't like 'localhost' (#1486924)
+        if (!preg_match('/\.[a-z]+$/i', $domain_part)) {
+            foreach (array($_SERVER['HTTP_HOST'], $_SERVER['SERVER_NAME']) as $host) {
+                $host = preg_replace('/:[0-9]+$/', '', $host);
+                if ($host && preg_match('/\.[a-z]+$/i', $host)) {
+                    $domain_part = $host;
+                }
+            }
+        }
+
+        return sprintf('<%s@%s>', $local_part, $domain_part);
+    }
+
+
+    /**
+     * Returns RFC2822 formatted current date in user's timezone
+     *
+     * @return string Date
+     */
+    public function user_date()
+    {
+        // get user's timezone
+        try {
+            $tz   = new DateTimeZone($this->config->get('timezone'));
+            $date = new DateTime('now', $tz);
+        }
+        catch (Exception $e) {
+            $date = new DateTime();
+        }
+
+        return $date->format('r');
+    }
+
+
+    /**
+     * E-mail address validation.
+     *
+     * @param string $email Email address
+     * @param boolean $dns_check True to check dns
+     *
+     * @return boolean True on success, False if address is invalid
+     */
+    public function check_email($email, $dns_check=true)
+    {
+        // Check for invalid characters
+        if (preg_match('/[\x00-\x1F\x7F-\xFF]/', $email)) {
+            return false;
+        }
+
+        // Check for length limit specified by RFC 5321 (#1486453)
+        if (strlen($email) > 254) {
+            return false;
+        }
+
+        $email_array = explode('@', $email);
+
+        // Check that there's one @ symbol
+        if (count($email_array) < 2) {
+            return false;
+        }
+
+        $domain_part = array_pop($email_array);
+        $local_part  = implode('@', $email_array);
+
+        // from PEAR::Validate
+        $regexp = '&^(?:
+	        ("\s*(?:[^"\f\n\r\t\v\b\s]+\s*)+")| 			 	            #1 quoted name
+	        ([-\w!\#\$%\&\'*+~/^`|{}=]+(?:\.[-\w!\#\$%\&\'*+~/^`|{}=]+)*)) 	#2 OR dot-atom (RFC5322)
+	        $&xi';
+
+        if (!preg_match($regexp, $local_part)) {
+            return false;
+        }
+
+        // Check domain part
+        if (preg_match('/^\[*(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\]*$/', $domain_part)) {
+            return true; // IP address
+        }
+        else {
+            // If not an IP address
+            $domain_array = explode('.', $domain_part);
+            // Not enough parts to be a valid domain
+            if (sizeof($domain_array) < 2) {
+                return false;
+            }
+
+            foreach ($domain_array as $part) {
+                if (!preg_match('/^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]))$/', $part)) {
+                    return false;
+                }
+            }
+
+            if (!$dns_check || !$this->config->get('email_dns_check')) {
+                return true;
+            }
+
+            if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN' && version_compare(PHP_VERSION, '5.3.0', '<')) {
+                $lookup = array();
+                @exec("nslookup -type=MX " . escapeshellarg($domain_part) . " 2>&1", $lookup);
+                foreach ($lookup as $line) {
+                    if (strpos($line, 'MX preference')) {
+                        return true;
+                    }
+                }
+                return false;
+            }
+
+            // find MX record(s)
+            if (getmxrr($domain_part, $mx_records)) {
+                return true;
+            }
+
+            // find any DNS record
+            if (checkdnsrr($domain_part, 'ANY')) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+
+    /**
+     * Write login data (name, ID, IP address) to the 'userlogins' log file.
+     */
+    public function log_login()
+    {
+        if (!$this->config->get('log_logins')) {
+            return;
+        }
+
+        $user_name = $this->get_user_name();
+        $user_id   = $this->get_user_id();
+
+        if (!$user_id) {
+            return;
+        }
+
+        self::write_log('userlogins',
+            sprintf('Successful login for %s (ID: %d) from %s in session %s',
+                $user_name, $user_id, self::remote_ip(), session_id()));
+    }
+
+
+    /**
+     * Check whether the HTTP referer matches the current request
+     *
+     * @return boolean True if referer is the same host+path, false if not
+     */
+    public static function check_referer()
+    {
+        $uri = parse_url($_SERVER['REQUEST_URI']);
+        $referer = parse_url(rcube_request_header('Referer'));
+        return $referer['host'] == rcube_request_header('Host') && $referer['path'] == $uri['path'];
+    }
+
+
+    /**
+     * Garbage collector function for temp files.
+     * Remove temp files older than two days
+     */
+    public function temp_gc()
+    {
+        $tmp = unslashify($this->config->get('temp_dir'));
+        $expire = mktime() - 172800;  // expire in 48 hours
+
+        if ($dir = opendir($tmp)) {
+            while (($fname = readdir($dir)) !== false) {
+                if ($fname{0} == '.') {
+                    continue;
+                }
+
+                if (filemtime($tmp.'/'.$fname) < $expire) {
+                    @unlink($tmp.'/'.$fname);
+                }
+            }
+
+            closedir($dir);
+        }
+    }
+
 }
-
-

--
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