source: subversion/trunk/roundcubemail/program/include/rcmail.php @ 6093

<?php

/*
 +-----------------------------------------------------------------------+
 | program/include/rcmail.php                                            |
 |                                                                       |
 | This file is part of the Roundcube Webmail client                     |
 | 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              |
 |   instances of all 'global' objects like db- and imap-connections     |
 +-----------------------------------------------------------------------+
 | Author: Thomas Bruederli <roundcube@gmail.com>                        |
 | Author: Aleksander Machniak <alec@alec.pl>                            |
 +-----------------------------------------------------------------------+

 $Id$

*/


/**
 * Application class of Roundcube Webmail
 * implemented as singleton
 *
 * @package Core
 */
class rcmail extends rcube
{
  /**
   * Main tasks.
   *
   * @var array
   */
  static public $main_tasks = array('mail','settings','addressbook','login','logout','utils','dummy');

  /**
   * Current task.
   *
   * @var string
   */
  public $task;

  /**
   * Current action.
   *
   * @var string
   */
  public $action = '';
  public $comm_path = './';

  private $address_books = array();
  private $action_map = array();


  const JS_OBJECT_NAME = 'rcmail';

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

    return self::$instance;
  }


  /**
   * Initial startup function
   * to register session, create database and imap connections
   */
  protected function startup()
  {
    $this->init(self::INIT_WITH_DB | self::INIT_WITH_PLUGINS);

    // start session
    $this->session_init();

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

    // configure session (after user config merge!)
    $this->session_configure();

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

    // reset some session parameters when changing task
    if ($this->task != 'utils') {
      if ($this->session && $_SESSION['task'] != $this->task)
        $this->session->remove('page');
      // set current task to session
      $_SESSION['task'] = $this->task;
    }

    // init output class
    if (!empty($_REQUEST['_remote']))
      $GLOBALS['OUTPUT'] = $this->json_init();
    else
      $GLOBALS['OUTPUT'] = $this->load_gui(!empty($_REQUEST['_framed']));

    // load plugins
    $this->plugins->init($this, $this->task);
    $this->plugins->load_plugins((array)$this->config->get('plugins', array()), array('filesystem_attachments', 'jqueryui'));
  }


  /**
   * Setter for application task
   *
   * @param string Task to set
   */
  public function set_task($task)
  {
    $task = asciiwords($task);

    if ($this->user && $this->user->ID)
      $task = !$task ? 'mail' : $task;
    else
      $task = 'login';

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

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


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

      // overwrite config with user preferences
      $this->config->set_user_prefs((array)$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', 'en_US.utf8');

    // workaround for http://bugs.php.net/bug.php?id=18556
    if (in_array($_SESSION['language'], array('tr_TR', 'ku', 'az_AZ')))
      setlocale(LC_CTYPE, 'en_US' . '.utf8');
  }


  /**
   * 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;
    $ldap_config = (array)$this->config->get('ldap_public');
    $abook_type  = strtolower($this->config->get('address_book_type'));

    // 'sql' is the alias for '0' used by autocomplete
    if ($id == 'sql')
        $id = '0';

    // 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['storage_host']));
    }
    else if ($id === '0') {
      $contacts = new rcube_contacts($this->db, $this->get_user_id());
    }
    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'];
        }
      }
    }

    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
    $this->address_books[$id] = $contacts;

    return $contacts;
  }


  /**
   * 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)
  {
    $abook_type = strtolower($this->config->get('address_book_type'));
    $ldap_config = $this->config->get('ldap_public');
    $autocomplete = (array) $this->config->get('autocomplete_addressbooks');
    $list = array();

    // We are using the DB address book
    if ($abook_type != 'ldap') {
      if (!isset($this->address_books['0']))
        $this->address_books['0'] = new rcube_contacts($this->db, $this->get_user_id());
      $list['0'] = array(
        'id'       => '0',
        'name'     => $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 => $prop) {
        // handle misconfiguration
        if (empty($prop) || !is_array($prop)) {
          continue;
        }
        $list[$id] = array(
          'id'       => $id,
          'name'     => $prop['name'],
          'groups'   => is_array($prop['groups']),
          'readonly' => !$prop['writable'],
          'hidden'   => $prop['hidden'],
          'autocomplete' => in_array($id, $autocomplete)
        );
      }
    }

    $plugin = $this->plugins->exec_hook('addressbooks_list', array('sources' => $list));
    $list = $plugin['sources'];

    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;
  }


  /**
   * 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 rcube_output_html Reference to HTML output object
   */
  public function load_gui($framed = false)
  {
    // init output page
    if (!($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())) {
      $this->output->set_env('keep_alive', $keep_alive);
    }

    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(RCMAIL_CHARSET);

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

    return $this->output;
  }


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

    return $this->output;
  }


  /**
   * Create session object and start the session.
   */
  public function session_init()
  {
    parent::session_init();

    // set initial session vars
    if (!$_SESSION['user_id'])
      $_SESSION['temp'] = true;

    // restore skin selection after logout
    if ($_SESSION['temp'] && !empty($_SESSION['skin']))
      $this->config->set('skin', $_SESSION['skin']);
  }


  /**
   * 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 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, $host=NULL)
  {
    if (empty($username)) {
      return false;
    }

    $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']) && $host != rcube_utils::parse_host($config['default_host']))
      return false;

    // parse $host URL
    $a_host = parse_url($host);
    if ($a_host['host']) {
      $host = $a_host['host'];
      $ssl = (isset($a_host['scheme']) && in_array($a_host['scheme'], array('ssl','imaps','tls'))) ? $a_host['scheme'] : null;
      if (!empty($a_host['port']))
        $port = $a_host['port'];
      else if ($ssl && $ssl != 'tls' && (!$config['default_port'] || $config['default_port'] == 143))
        $port = 993;
    }

    if (!$port) {
        $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, '@') === false) {
      if (is_array($config['username_domain']) && isset($config['username_domain'][$host]))
        $username .= '@'.rcube_utils::parse_host($config['username_domain'][$host], $host);
      else if (is_string($config['username_domain']))
        $username .= '@'.rcube_utils::parse_host($config['username_domain'], $host);
    }

    // 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);
    }

    // try to resolve email address from virtuser table
    if (strpos($username, '@') && ($virtuser = rcube_user::email2user($username))) {
      $username = $virtuser;
    }

    // Here we need IDNA ASCII
    // Only rcube_contacts class is using domain names in Unicode
    $host = rcube_utils::idn_to_ascii($host);
    if (strpos($username, '@')) {
      // lowercase domain name
      list($local, $domain) = explode('@', $username);
      $username = $local . '@' . mb_strtolower($domain);
      $username = rcube_utils::idn_to_ascii($username);
    }

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

    $storage = $this->get_storage();

    // try to log in
    if (!($login = $storage->connect($host, $username, $pass, $port, $ssl))) {
      // try with lowercase
      $username_lc = mb_strtolower($username);
      if ($username_lc != $username) {
        // try to find user record again -> overwrite username
        if (!$user && ($user = rcube_user::query($username_lc, $host)))
          $username_lc = $user->data['username'];

        if ($login = $storage->connect($host, $username_lc, $pass, $port, $ssl))
          $username = $username_lc;
      }
    }

    // exit if login failed
    if (!$login) {
      return false;
    }

    // user already registered -> update user's record
    if (is_object($user)) {
      // 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;
      }
      else {
        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 {
      self::raise_error(array(
        'code' => 621, 'type' => 'php',
        'file' => __FILE__, 'line' => __LINE__,
        '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']))) {
        $storage->create_default_folders();
      }

      // set session vars
      $_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
      $storage->clear_cache('mailboxes', true);

      return true;
    }

    return false;
  }


  /**
   * 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 = rcube_utils::get_input_value('_host', rcube_utils::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, $domain) = explode('@', rcube_utils::get_input_value('_user', rcube_utils::INPUT_POST));
      if (!empty($domain)) {
        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 $host is still not set
      if (empty($host)) {
        list($key, $val) = each($default_host);
        $host = is_numeric($key) ? $val : $key;
      }
    }
    else if (empty($default_host)) {
      $host = rcube_utils::get_input_value('_host', rcube_utils::INPUT_POST);
    }
    else
      $host = rcube_utils::parse_host($default_host);

    return $host;
  }


  /**
   * Destroy session data and remove cookie
   */
  public function kill_session()
  {
    $this->plugins->exec_hook('session_destroy');

    $this->session->kill();
    $_SESSION = array('language' => $this->user->language, 'temp' => true, 'skin' => $this->config->get('skin'));
    $this->user->reset();
  }


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

    if ($config['logout_purge'] && !empty($config['trash_mbox'])) {
      $storage->clear_folder($config['trash_mbox']);
    }

    if ($config['logout_expunge']) {
      $storage->expunge_folder('INBOX');
    }

    // Try to save unsaved user preferences
    if (!empty($_SESSION['preferences'])) {
      $this->user->save_prefs(unserialize($_SESSION['preferences']));
    }
  }


  /**
   * Generate a unique token to be used in a form request
   *
   * @return string The request token
   */
  public function get_request_token()
  {
    $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'];
  }


  /**
   * Check if the current request contains a valid token
   *
   * @param int Request method
   * @return boolean True if request token is valid false if not
   */
  public function check_request($mode = rcube_utils::INPUT_POST)
  {
    $token = rcube_utils::get_input_value('_token', $mode);
    $sess_id = $_COOKIE[ini_get('session.name')];
    return !empty($sess_id) && $token == $this->get_request_token();
  }


  /**
   * 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('rcmail*sess%sR%s*Chk:%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);
  }


  /**
   * 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));

    $task = $p['_task'] ? $p['_task'] : ($p['task'] ? $p['task'] : $this->task);
    $p['_task'] = $task;
    unset($p['task']);

    $url = './';
    $delm = '?';
    foreach (array_reverse($p) as $key => $val) {
      if ($val !== '' && $val !== null) {
        $par = $key[0] == '_' ? $key : '_'.$key;
        $url .= $delm.urlencode($par).'='.urlencode($val);
        $delm = '&';
      }
    }
    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 = $this->show_bytes(memory_get_usage());
      if (function_exists('memory_get_peak_usage'))
        $mem .= '/'.$this->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);
    }
  }

  /**
   * 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');
    }


    /**
     * 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, rcube_utils::remote_ip(), session_id()));
    }


    /**
     * Create a HTML table based on the given data
     *
     * @param  array  Named table attributes
     * @param  mixed  Table row data. Either a two-dimensional array or a valid SQL result set
     * @param  array  List of cols to show
     * @param  string Name of the identifier col
     *
     * @return string HTML table code
     */
    public function table_output($attrib, $table_data, $a_show_cols, $id_col)
    {
        $table = new html_table(/*array('cols' => count($a_show_cols))*/);

        // add table header
        if (!$attrib['noheader']) {
            foreach ($a_show_cols as $col) {
                $table->add_header($col, $this->Q($this->gettext($col)));
            }
        }

        if (!is_array($table_data)) {
            $db = $this->get_dbh();
            while ($table_data && ($sql_arr = $db->fetch_assoc($table_data))) {
                $table->add_row(array('id' => 'rcmrow' . rcube_utils::html_identifier($sql_arr[$id_col])));

                // format each col
                foreach ($a_show_cols as $col) {
                    $table->add($col, $this->Q($sql_arr[$col]));
                }
            }
        }
        else {
            foreach ($table_data as $row_data) {
                $class = !empty($row_data['class']) ? $row_data['class'] : '';
                $rowid = 'rcmrow' . rcube_utils::html_identifier($row_data[$id_col]);

                $table->add_row(array('id' => $rowid, 'class' => $class));

                // format each col
                foreach ($a_show_cols as $col) {
                    $table->add($col, $this->Q(is_array($row_data[$col]) ? $row_data[$col][0] : $row_data[$col]));
                }
            }
        }

        return $table->show($attrib);
    }


    /**
     * Convert the given date to a human readable form
     * This uses the date formatting properties from config
     *
     * @param mixed  Date representation (string, timestamp or DateTime object)
     * @param string Date format to use
     * @param bool   Enables date convertion according to user timezone
     *
     * @return string Formatted date string
     */
    public function format_date($date, $format = null, $convert = true)
    {
        if (is_object($date) && is_a($date, 'DateTime')) {
            $timestamp = $date->format('U');
        }
        else {
            if (!empty($date)) {
                $timestamp = rcube_strtotime($date);
            }

            if (empty($timestamp)) {
                return '';
            }

            try {
                $date = new DateTime("@".$timestamp);
            }
            catch (Exception $e) {
                return '';
            }
        }

        if ($convert) {
            try {
                // convert to the right timezone
                $stz = date_default_timezone_get();
                $tz = new DateTimeZone($this->config->get('timezone'));
                $date->setTimezone($tz);
                date_default_timezone_set($tz->getName());

                $timestamp = $date->format('U');
            }
            catch (Exception $e) {
            }
        }

        // define date format depending on current time
        if (!$format) {
            $now         = time();
            $now_date    = getdate($now);
            $today_limit = mktime(0, 0, 0, $now_date['mon'], $now_date['mday'], $now_date['year']);
            $week_limit  = mktime(0, 0, 0, $now_date['mon'], $now_date['mday']-6, $now_date['year']);
            $pretty_date = $this->config->get('prettydate');

            if ($pretty_date && $timestamp > $today_limit && $timestamp < $now) {
                $format = $this->config->get('date_today', $this->config->get('time_format', 'H:i'));
                $today  = true;
            }
            else if ($pretty_date && $timestamp > $week_limit && $timestamp < $now) {
                $format = $this->config->get('date_short', 'D H:i');
            }
            else {
                $format = $this->config->get('date_long', 'Y-m-d H:i');
            }
        }

        // strftime() format
        if (preg_match('/%[a-z]+/i', $format)) {
            $format = strftime($format, $timestamp);
            if ($stz) {
                date_default_timezone_set($stz);
            }
            return $today ? ($this->gettext('today') . ' ' . $format) : $format;
        }

        // parse format string manually in order to provide localized weekday and month names
        // an alternative would be to convert the date() format string to fit with strftime()
        $out = '';
        for ($i=0; $i<strlen($format); $i++) {
            if ($format[$i] == "\\") {  // skip escape chars
                continue;
            }

            // write char "as-is"
            if ($format[$i] == ' ' || $format[$i-1] == "\\") {
                $out .= $format[$i];
            }
            // weekday (short)
            else if ($format[$i] == 'D') {
                $out .= $this->gettext(strtolower(date('D', $timestamp)));
            }
            // weekday long
            else if ($format[$i] == 'l') {
                $out .= $this->gettext(strtolower(date('l', $timestamp)));
            }
            // month name (short)
            else if ($format[$i] == 'M') {
                $out .= $this->gettext(strtolower(date('M', $timestamp)));
            }
            // month name (long)
            else if ($format[$i] == 'F') {
                $out .= $this->gettext('long'.strtolower(date('M', $timestamp)));
            }
            else if ($format[$i] == 'x') {
                $out .= strftime('%x %X', $timestamp);
            }
            else {
                $out .= date($format[$i], $timestamp);
            }
        }

        if ($today) {
            $label = $this->gettext('today');
            // replcae $ character with "Today" label (#1486120)
            if (strpos($out, '$') !== false) {
                $out = preg_replace('/\$/', $label, $out, 1);
            }
            else {
                $out = $label . ' ' . $out;
            }
        }

        if ($stz) {
            date_default_timezone_set($stz);
        }

        return $out;
    }


    /**
     * Return folders list in HTML
     *
     * @param array $attrib Named parameters
     *
     * @return string HTML code for the gui object
     */
    public function folder_list($attrib)
    {
        static $a_mailboxes;

        $attrib += array('maxlength' => 100, 'realnames' => false, 'unreadwrap' => ' (%s)');

        $rcmail  = rcmail::get_instance();
        $storage = $rcmail->get_storage();

        // add some labels to client
        $rcmail->output->add_label('purgefolderconfirm', 'deletemessagesconfirm');

        $type = $attrib['type'] ? $attrib['type'] : 'ul';
        unset($attrib['type']);

        if ($type == 'ul' && !$attrib['id']) {
            $attrib['id'] = 'rcmboxlist';
        }

        if (empty($attrib['folder_name'])) {
            $attrib['folder_name'] = '*';
        }

        // get current folder
        $mbox_name = $storage->get_folder();

        // build the folders tree
        if (empty($a_mailboxes)) {
            // get mailbox list
            $a_folders = $storage->list_folders_subscribed(
                '', $attrib['folder_name'], $attrib['folder_filter']);
            $delimiter = $storage->get_hierarchy_delimiter();
            $a_mailboxes = array();

            foreach ($a_folders as $folder) {
                $rcmail->build_folder_tree($a_mailboxes, $folder, $delimiter);
            }
        }

        // allow plugins to alter the folder tree or to localize folder names
        $hook = $rcmail->plugins->exec_hook('render_mailboxlist', array(
            'list'      => $a_mailboxes,
            'delimiter' => $delimiter,
            'type'      => $type,
            'attribs'   => $attrib,
        ));

        $a_mailboxes = $hook['list'];
        $attrib      = $hook['attribs'];

        if ($type == 'select') {
            $select = new html_select($attrib);

            // add no-selection option
            if ($attrib['noselection']) {
                $select->add($rcmail->gettext($attrib['noselection']), '');
            }

            $rcmail->render_folder_tree_select($a_mailboxes, $mbox_name, $attrib['maxlength'], $select, $attrib['realnames']);
            $out = $select->show($attrib['default']);
        }
        else {
            $js_mailboxlist = array();
            $out = html::tag('ul', $attrib, $rcmail->render_folder_tree_html($a_mailboxes, $mbox_name, $js_mailboxlist, $attrib), html::$common_attrib);

            $rcmail->output->add_gui_object('mailboxlist', $attrib['id']);
            $rcmail->output->set_env('mailboxes', $js_mailboxlist);
            $rcmail->output->set_env('unreadwrap', $attrib['unreadwrap']);
            $rcmail->output->set_env('collapsed_folders', (string)$rcmail->config->get('collapsed_folders'));
        }

        return $out;
    }


    /**
     * Return folders list as html_select object
     *
     * @param array $p  Named parameters
     *
     * @return html_select HTML drop-down object
     */
    public function folder_selector($p = array())
    {
        $p += array('maxlength' => 100, 'realnames' => false);
        $a_mailboxes = array();
        $storage = $this->get_storage();

        if (empty($p['folder_name'])) {
            $p['folder_name'] = '*';
        }

        if ($p['unsubscribed']) {
            $list = $storage->list_folders('', $p['folder_name'], $p['folder_filter'], $p['folder_rights']);
        }
        else {
            $list = $storage->list_folders_subscribed('', $p['folder_name'], $p['folder_filter'], $p['folder_rights']);
        }

        $delimiter = $storage->get_hierarchy_delimiter();

        foreach ($list as $folder) {
            if (empty($p['exceptions']) || !in_array($folder, $p['exceptions'])) {
                $this->build_folder_tree($a_mailboxes, $folder, $delimiter);
            }
        }

        $select = new html_select($p);

        if ($p['noselection']) {
            $select->add($p['noselection'], '');
        }

        $this->render_folder_tree_select($a_mailboxes, $mbox, $p['maxlength'], $select, $p['realnames'], 0, $p);

        return $select;
    }


    /**
     * Create a hierarchical array of the mailbox list
     */
    public function build_folder_tree(&$arrFolders, $folder, $delm = '/', $path = '')
    {
        // Handle namespace prefix
        $prefix = '';
        if (!$path) {
            $n_folder = $folder;
            $folder = $this->storage->mod_folder($folder);

            if ($n_folder != $folder) {
                $prefix = substr($n_folder, 0, -strlen($folder));
            }
        }

        $pos = strpos($folder, $delm);

        if ($pos !== false) {
            $subFolders    = substr($folder, $pos+1);
            $currentFolder = substr($folder, 0, $pos);

            // sometimes folder has a delimiter as the last character
            if (!strlen($subFolders)) {
                $virtual = false;
            }
            else if (!isset($arrFolders[$currentFolder])) {
                $virtual = true;
            }
            else {
                $virtual = $arrFolders[$currentFolder]['virtual'];
            }
        }
        else {
            $subFolders    = false;
            $currentFolder = $folder;
            $virtual       = false;
        }

        $path .= $prefix . $currentFolder;

        if (!isset($arrFolders[$currentFolder])) {
            $arrFolders[$currentFolder] = array(
                'id' => $path,
                'name' => rcube_charset::convert($currentFolder, 'UTF7-IMAP'),
                'virtual' => $virtual,
                'folders' => array());
        }
        else {
            $arrFolders[$currentFolder]['virtual'] = $virtual;
        }

        if (strlen($subFolders)) {
            $this->build_folder_tree($arrFolders[$currentFolder]['folders'], $subFolders, $delm, $path.$delm);
        }
    }


    /**
     * Return html for a structured list &lt;ul&gt; for the mailbox tree
     */
    public function render_folder_tree_html(&$arrFolders, &$mbox_name, &$jslist, $attrib, $nestLevel = 0)
    {
        $maxlength = intval($attrib['maxlength']);
        $realnames = (bool)$attrib['realnames'];
        $msgcounts = $this->storage->get_cache('messagecount');
        $collapsed = $this->config->get('collapsed_folders');

        $out = '';
        foreach ($arrFolders as $key => $folder) {
            $title        = null;
            $folder_class = $this->folder_classname($folder['id']);
            $is_collapsed = strpos($collapsed, '&'.rawurlencode($folder['id']).'&') !== false;
            $unread       = $msgcounts ? intval($msgcounts[$folder['id']]['UNSEEN']) : 0;

            if ($folder_class && !$realnames) {
                $foldername = $this->gettext($folder_class);
            }
            else {
                $foldername = $folder['name'];

                // shorten the folder name to a given length
                if ($maxlength && $maxlength > 1) {
                    $fname = abbreviate_string($foldername, $maxlength);
                    if ($fname != $foldername) {
                        $title = $foldername;
                    }
                    $foldername = $fname;
                }
            }

            // make folder name safe for ids and class names
            $folder_id = rcube_utils::html_identifier($folder['id'], true);
            $classes   = array('mailbox');

            // set special class for Sent, Drafts, Trash and Junk
            if ($folder_class) {
                $classes[] = $folder_class;
            }

            if ($folder['id'] == $mbox_name) {
                $classes[] = 'selected';
            }

            if ($folder['virtual']) {
                $classes[] = 'virtual';
            }
            else if ($unread) {
                $classes[] = 'unread';
            }

            $js_name = $this->JQ($folder['id']);
            $html_name = $this->Q($foldername) . ($unread ? html::span('unreadcount', sprintf($attrib['unreadwrap'], $unread)) : '');
            $link_attrib = $folder['virtual'] ? array() : array(
                'href' => $this->url(array('_mbox' => $folder['id'])),
                'onclick' => sprintf("return %s.command('list','%s',this)", rcmail::JS_OBJECT_NAME, $js_name),
                'rel' => $folder['id'],
                'title' => $title,
            );

            $out .= html::tag('li', array(
                'id' => "rcmli".$folder_id,
                'class' => join(' ', $classes),
                'noclose' => true),
                html::a($link_attrib, $html_name) .
                (!empty($folder['folders']) ? html::div(array(
                    'class' => ($is_collapsed ? 'collapsed' : 'expanded'),
                    'style' => "position:absolute",
                    'onclick' => sprintf("%s.command('collapse-folder', '%s')", rcmail::JS_OBJECT_NAME, $js_name)
                ), '&nbsp;') : ''));

            $jslist[$folder_id] = array(
                'id'      => $folder['id'],
                'name'    => $foldername,
                'virtual' => $folder['virtual']
            );

            if (!empty($folder['folders'])) {
                $out .= html::tag('ul', array('style' => ($is_collapsed ? "display:none;" : null)),
                    $this->render_folder_tree_html($folder['folders'], $mbox_name, $jslist, $attrib, $nestLevel+1));
            }

            $out .= "</li>\n";
        }

        return $out;
    }


    /**
     * Return html for a flat list <select> for the mailbox tree
     */
    public function render_folder_tree_select(&$arrFolders, &$mbox_name, $maxlength, &$select, $realnames = false, $nestLevel = 0, $opts = array())
    {
        $out = '';

        foreach ($arrFolders as $key => $folder) {
            // skip exceptions (and its subfolders)
            if (!empty($opts['exceptions']) && in_array($folder['id'], $opts['exceptions'])) {
                continue;
            }

            // skip folders in which it isn't possible to create subfolders
            if (!empty($opts['skip_noinferiors'])) {
                $attrs = $this->storage->folder_attributes($folder['id']);
                if ($attrs && in_array('\\Noinferiors', $attrs)) {
                    continue;
                }
            }

            if (!$realnames && ($folder_class = $this->folder_classname($folder['id']))) {
                $foldername = $this->gettext($folder_class);
            }
            else {
                $foldername = $folder['name'];

                // shorten the folder name to a given length
                if ($maxlength && $maxlength > 1) {
                    $foldername = abbreviate_string($foldername, $maxlength);
                }

                 $select->add(str_repeat('&nbsp;', $nestLevel*4) . $foldername, $folder['id']);

                if (!empty($folder['folders'])) {
                    $out .= $this->render_folder_tree_select($folder['folders'], $mbox_name, $maxlength,
                        $select, $realnames, $nestLevel+1, $opts);
                }
            }
        }

        return $out;
    }


    /**
     * Return internal name for the given folder if it matches the configured special folders
     */
    public function folder_classname($folder_id)
    {
        if ($folder_id == 'INBOX') {
            return 'inbox';
        }

        // for these mailboxes we have localized labels and css classes
        foreach (array('sent', 'drafts', 'trash', 'junk') as $smbx)
        {
            if ($folder_id === $this->config->get($smbx.'_mbox')) {
                return $smbx;
            }
        }
    }


    /**
     * Try to localize the given IMAP folder name.
     * UTF-7 decode it in case no localized text was found
     *
     * @param string $name  Folder name
     *
     * @return string Localized folder name in UTF-8 encoding
     */
    public function localize_foldername($name)
    {
        if ($folder_class = $this->folder_classname($name)) {
            return $this->gettext($folder_class);
        }
        else {
            return rcube_charset::convert($name, 'UTF7-IMAP');
        }
    }


    public function localize_folderpath($path)
    {
        $protect_folders = $this->config->get('protect_default_folders');
        $default_folders = (array) $this->config->get('default_folders');
        $delimiter       = $this->storage->get_hierarchy_delimiter();
        $path            = explode($delimiter, $path);
        $result          = array();

        foreach ($path as $idx => $dir) {
            $directory = implode($delimiter, array_slice($path, 0, $idx+1));
            if ($protect_folders && in_array($directory, $default_folders)) {
                unset($result);
                $result[] = $this->localize_foldername($directory);
            }
            else {
                $result[] = rcube_charset::convert($dir, 'UTF7-IMAP');
            }
        }

        return implode($delimiter, $result);
    }


    public static function quota_display($attrib)
    {
        $rcmail = rcmail::get_instance();

        if (!$attrib['id']) {
            $attrib['id'] = 'rcmquotadisplay';
        }

        $_SESSION['quota_display'] = !empty($attrib['display']) ? $attrib['display'] : 'text';

        $rcmail->output->add_gui_object('quotadisplay', $attrib['id']);

        $quota = $rcmail->quota_content($attrib);

        $rcmail->output->add_script('rcmail.set_quota('.rcube_output::json_serialize($quota).');', 'docready');

        return html::span($attrib, '');
    }


    public function quota_content($attrib = null)
    {
        $quota = $this->storage->get_quota();
        $quota = $this->plugins->exec_hook('quota', $quota);

        $quota_result = (array) $quota;
        $quota_result['type'] = isset($_SESSION['quota_display']) ? $_SESSION['quota_display'] : '';

        if (!$quota['total'] && $this->config->get('quota_zero_as_unlimited')) {
            $quota_result['title']   = $this->gettext('unlimited');
            $quota_result['percent'] = 0;
        }
        else if ($quota['total']) {
            if (!isset($quota['percent'])) {
                $quota_result['percent'] = min(100, round(($quota['used']/max(1,$quota['total']))*100));
            }

            $title = sprintf('%s / %s (%.0f%%)',
                $this->show_bytes($quota['used'] * 1024), $this->show_bytes($quota['total'] * 1024),
                $quota_result['percent']);

            $quota_result['title'] = $title;

            if ($attrib['width']) {
                $quota_result['width'] = $attrib['width'];
            }
            if ($attrib['height']) {
                $quota_result['height'] = $attrib['height'];
            }
        }
        else {
            $quota_result['title']   = $this->gettext('unknown');
            $quota_result['percent'] = 0;
        }

        return $quota_result;
    }


    /**
     * Outputs error message according to server error/response codes
     *
     * @param string $fallback       Fallback message label
     * @param array  $fallback_args  Fallback message label arguments
     */
    public function display_server_error($fallback = null, $fallback_args = null)
    {
        $err_code = $this->storage->get_error_code();
        $res_code = $this->storage->get_response_code();

        if ($err_code < 0) {
            $this->output->show_message('storageerror', 'error');
        }
        else if ($res_code == rcube_storage::NOPERM) {
            $this->output->show_message('errornoperm', 'error');
        }
        else if ($res_code == rcube_storage::READONLY) {
            $this->output->show_message('errorreadonly', 'error');
        }
        else if ($err_code && ($err_str = $this->storage->get_error_str())) {
            // try to detect access rights problem and display appropriate message
            if (stripos($err_str, 'Permission denied') !== false) {
                $this->output->show_message('errornoperm', 'error');
            }
            else {
                $this->output->show_message('servererrormsg', 'error', array('msg' => $err_str));
            }
        }
        else if ($fallback) {
            $this->output->show_message($fallback, 'error', $fallback_args);
        }
    }


    /**
     * Output HTML editor scripts
     *
     * @param string $mode  Editor mode
     */
    public function html_editor($mode = '')
    {
        $hook = $this->plugins->exec_hook('html_editor', array('mode' => $mode));

        if ($hook['abort']) {
            return;
        }

        $lang = strtolower($_SESSION['language']);

        // TinyMCE uses two-letter lang codes, with exception of Chinese
        if (strpos($lang, 'zh_') === 0) {
            $lang = str_replace('_', '-', $lang);
        }
        else {
            $lang = substr($lang, 0, 2);
        }

        if (!file_exists(INSTALL_PATH . 'program/js/tiny_mce/langs/'.$lang.'.js')) {
            $lang = 'en';
        }

        $script = json_encode(array(
            'mode'       => $mode,
            'lang'       => $lang,
            'skin_path'  => $this->output->get_skin_path(),
            'spellcheck' => intval($this->config->get('enable_spellcheck')),
            'spelldict'  => intval($this->config->get('spellcheck_dictionary'))
        ));

        $this->output->include_script('tiny_mce/tiny_mce.js');
        $this->output->include_script('editor.js');
        $this->output->add_script("rcmail_editor_init($script)", 'docready');
    }


    /**
     * Replaces TinyMCE's emoticon images with plain-text representation
     *
     * @param string $html  HTML content
     *
     * @return string HTML content
     */
    public static function replace_emoticons($html)
    {
        $emoticons = array(
            '8-)' => 'smiley-cool',
            ':-#' => 'smiley-foot-in-mouth',
            ':-*' => 'smiley-kiss',
            ':-X' => 'smiley-sealed',
            ':-P' => 'smiley-tongue-out',
            ':-@' => 'smiley-yell',
            ":'(" => 'smiley-cry',
            ':-(' => 'smiley-frown',
            ':-D' => 'smiley-laughing',
            ':-)' => 'smiley-smile',
            ':-S' => 'smiley-undecided',
            ':-$' => 'smiley-embarassed',
            'O:-)' => 'smiley-innocent',
            ':-|' => 'smiley-money-mouth',
            ':-O' => 'smiley-surprised',
            ';-)' => 'smiley-wink',
        );

        foreach ($emoticons as $idx => $file) {
            // <img title="Cry" src="http://.../program/js/tiny_mce/plugins/emotions/img/smiley-cry.gif" border="0" alt="Cry" />
            $search[]  = '/<img title="[a-z ]+" src="https?:\/\/[a-z0-9_.\/-]+\/tiny_mce\/plugins\/emotions\/img\/'.$file.'.gif"[^>]+\/>/i';
            $replace[] = $idx;
        }

        return preg_replace($search, $replace, $html);
    }


    /**
     * File upload progress handler.
     */
    public function upload_progress()
    {
        $prefix = ini_get('apc.rfc1867_prefix');
        $params = array(
            'action' => $this->action,
            'name' => rcube_utils::get_input_value('_progress', rcube_utils::INPUT_GET),
        );

        if (function_exists('apc_fetch')) {
            $status = apc_fetch($prefix . $params['name']);

            if (!empty($status)) {
                $status['percent'] = round($status['current']/$status['total']*100);
                $params = array_merge($status, $params);
            }
        }

        if (isset($params['percent']))
            $params['text'] = $this->gettext(array('name' => 'uploadprogress', 'vars' => array(
                'percent' => $params['percent'] . '%',
                'current' => $this->show_bytes($params['current']),
                'total'   => $this->show_bytes($params['total'])
        )));

        $this->output->command('upload_progress_update', $params);
        $this->output->send();
    }


    /**
     * Initializes file uploading interface.
     */
    public function upload_init()
    {
        // Enable upload progress bar
        if (($seconds = $this->config->get('upload_progress')) && ini_get('apc.rfc1867')) {
            if ($field_name = ini_get('apc.rfc1867_name')) {
                $this->output->set_env('upload_progress_name', $field_name);
                $this->output->set_env('upload_progress_time', (int) $seconds);
            }
        }

        // find max filesize value
        $max_filesize = parse_bytes(ini_get('upload_max_filesize'));
        $max_postsize = parse_bytes(ini_get('post_max_size'));
        if ($max_postsize && $max_postsize < $max_filesize) {
            $max_filesize = $max_postsize;
        }

        $this->output->set_env('max_filesize', $max_filesize);
        $max_filesize = self::show_bytes($max_filesize);
        $this->output->set_env('filesizeerror', $this->gettext(array(
            'name' => 'filesizeerror', 'vars' => array('size' => $max_filesize))));

        return $max_filesize;
    }


    /**
     * Initializes client-side autocompletion.
     */
    public function autocomplete_init()
    {
        static $init;

        if ($init) {
            return;
        }

        $init = 1;

        if (($threads = (int)$this->config->get('autocomplete_threads')) > 0) {
            $book_types = (array) $this->config->get('autocomplete_addressbooks', 'sql');
            if (count($book_types) > 1) {
                $this->output->set_env('autocomplete_threads', $threads);
                $this->output->set_env('autocomplete_sources', $book_types);
            }
        }

        $this->output->set_env('autocomplete_max', (int)$this->config->get('autocomplete_max', 15));
        $this->output->set_env('autocomplete_min_length', $this->config->get('autocomplete_min_length'));
        $this->output->add_label('autocompletechars', 'autocompletemore');
    }


    /**
     * Returns supported font-family specifications
     *
     * @param string $font  Font name
     *
     * @param string|array Font-family specification array or string (if $font is used)
     */
    public static function font_defs($font = null)
    {
        $fonts = array(
            'Andale Mono'   => '"Andale Mono",Times,monospace',
            'Arial'         => 'Arial,Helvetica,sans-serif',
            'Arial Black'   => '"Arial Black","Avant Garde",sans-serif',
            'Book Antiqua'  => '"Book Antiqua",Palatino,serif',
            'Courier New'   => '"Courier New",Courier,monospace',
            'Georgia'       => 'Georgia,Palatino,serif',
            'Helvetica'     => 'Helvetica,Arial,sans-serif',
            'Impact'        => 'Impact,Chicago,sans-serif',
            'Tahoma'        => 'Tahoma,Arial,Helvetica,sans-serif',
            'Terminal'      => 'Terminal,Monaco,monospace',
            'Times New Roman' => '"Times New Roman",Times,serif',
            'Trebuchet MS'  => '"Trebuchet MS",Geneva,sans-serif',
            'Verdana'       => 'Verdana,Geneva,sans-serif',
        );

        if ($font) {
            return $fonts[$font];
        }

        return $fonts;
    }


    /**
     * Create a human readable string for a number of bytes
     *
     * @param int Number of bytes
     *
     * @return string Byte string
     */
    public function show_bytes($bytes)
    {
        if ($bytes >= 1073741824) {
            $gb  = $bytes/1073741824;
            $str = sprintf($gb>=10 ? "%d " : "%.1f ", $gb) . $this->gettext('GB');
        }
        else if ($bytes >= 1048576) {
            $mb  = $bytes/1048576;
            $str = sprintf($mb>=10 ? "%d " : "%.1f ", $mb) . $this->gettext('MB');
        }
        else if ($bytes >= 1024) {
            $str = sprintf("%d ",  round($bytes/1024)) . $this->gettext('KB');
        }
        else {
            $str = sprintf('%d ', $bytes) . $this->gettext('B');
        }

        return $str;
    }


    /**
     * Quote a given string.
     * Shortcut function for rcube_utils::rep_specialchars_output()
     *
     * @return string HTML-quoted string
     */
    public static function Q($str, $mode = 'strict', $newlines = true)
    {
        return rcube_utils::rep_specialchars_output($str, 'html', $mode, $newlines);
    }


    /**
     * Quote a given string for javascript output.
     * Shortcut function for rcube_utils::rep_specialchars_output()
     *
     * @return string JS-quoted string
     */
    public static function JQ($str)
    {
        return rcube_utils::rep_specialchars_output($str, 'js');
    }


    /************************************************************************
     *********          Deprecated methods (to be removed)          *********
     ***********************************************************************/

    public static function setcookie($name, $value, $exp = 0)
    {
        rcube_utils::setcookie($name, $value, $exp);
    }
}