/program/include/rcmail.php

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<?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>                            |
 +-----------------------------------------------------------------------+
*/


/**
 * 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 ERROR_STORAGE          = -2;
  const ERROR_INVALID_REQUEST  = 1;
  const ERROR_INVALID_HOST     = 2;
  const ERROR_COOKIES_DISABLED = 3;


  /**
   * 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']));

    // 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 ($this->task != 'utils') {
      // we reset list page when switching to another task
      // but only to the main task interface - empty action (#1489076)
      // this will prevent from unintentional page reset on cross-task requests
      if ($this->session && $_SESSION['task'] != $this->task && empty($this->action))
        $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, true);

    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());
    }

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

    // set localization
    setlocale(LC_ALL, $lang . '.utf8', $lang . '.UTF-8', 'en_US.utf8', 'en_US.UTF-8');

    // workaround for http://bugs.php.net/bug.php?id=18556
    if (version_compare(PHP_VERSION, '5.5.0', '<') && in_array($lang, array('tr_TR', 'ku', 'az_AZ'))) {
      setlocale(LC_CTYPE, 'en_US.utf8', 'en_US.UTF-8');
    }
  }


  /**
   * Return instance of the internal address book class
   *
   * @param string  Address book identifier (-1 for default addressbook)
   * @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');

    // 'sql' is the alias for '0' used by autocomplete
    if ($id == 'sql')
      $id = '0';
    else if ($id == -1) {
      $id = $this->config->get('default_addressbook');
      $default = true;
    }

    // use existing instance
    if (isset($this->address_books[$id]) && ($this->address_books[$id] instanceof rcube_addressbook)) {
      $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'];
      }
    }

    // when user requested default writeable addressbook
    // we need to check if default is writeable, if not we
    // will return first writeable book (if any exist)
    if ($contacts && $default && $contacts->readonly && $writeable) {
      $contacts = null;
    }

    // Get first addressbook from the list if configured default doesn't exist
    // This can happen when user deleted the addressbook (e.g. Kolab folder)
    if (!$contacts && (!$id || $default)) {
      $source = reset($this->get_address_sources($writeable, !$default));
      if (!empty($source)) {
        $contacts = $this->get_address_book($source['id']);
        if ($contacts) {
          $id = $source['id'];
        }
      }
    }

    if (!$contacts) {
      // there's no default, just return
      if ($default) {
        return null;
      }

      self::raise_error(array(
        'code' => 700, 'type' => 'php',
        'file' => __FILE__, 'line' => __LINE__,
        'message' => "Addressbook source ($id) not found!"),
        true, true);
    }

    // add to the 'books' array for shutdown function
    $this->address_books[$id] = $contacts;

    if ($writeable && $contacts->readonly) {
      return null;
    }

    // set configured sort order
    if ($sort_col = $this->config->get('addressbook_sort_col')) {
        $contacts->set_sort_order($sort_col);
    }

    return $contacts;
  }


  /**
   * Return address books list
   *
   * @param boolean True if the address book needs to be writeable
   * @param boolean True if the address book needs to be not hidden
   *
   * @return array  Address books array
   */
  public function get_address_sources($writeable = false, $skip_hidden = false)
  {
    $abook_type   = (string) $this->config->get('address_book_type');
    $ldap_config  = (array) $this->config->get('ldap_public');
    $autocomplete = (array) $this->config->get('autocomplete_addressbooks');
    $list         = array();

    // We are using the DB address book or a plugin address book
    if (!empty($abook_type) && strtolower($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 (!empty($ldap_config)) {
      foreach ($ldap_config as $id => $prop) {
        // handle misconfiguration
        if (empty($prop) || !is_array($prop)) {
          continue;
        }
        $list[$id] = array(
          'id'       => $id,
          'name'     => html::quote($prop['name']),
          'groups'   => !empty($prop['groups']) || !empty($prop['group_filters']),
          '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[$idx]);
      }
      // remove from list if hidden as requested
      else if ($skip_hidden && $item['hidden']) {
          unset($list[$idx]);
      }
    }

    return $list;
  }


  /**
   * Init output object for GUI and add common scripts.
   * This will instantiate a rcmail_output_html 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 Reference to HTML output object
   */
  public function load_gui($framed = false)
  {
    // init output page
    if (!($this->output instanceof rcmail_output_html))
      $this->output = new rcmail_output_html($this->task, $framed);

    // set refresh interval
    $this->output->set_env('refresh_interval', $this->config->get('refresh_interval', 0));
    $this->output->set_env('session_lifetime', $this->config->get('session_lifetime', 0) * 60);

    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(RCUBE_CHARSET);

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

    return $this->output;
  }


  /**
   * Create an output object for JSON responses
   *
   * @return rcube_output Reference to JSON output object
   */
  public function json_init()
  {
    if (!($this->output instanceof rcmail_output_json))
      $this->output = new rcmail_output_json($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
   * @param bool   Enables cookie check
   *
   * @return boolean True on success, False on failure
   */
  function login($username, $pass, $host = null, $cookiecheck = false)
  {
    $this->login_error = null;

    if (empty($username)) {
      return false;
    }

    if ($cookiecheck && empty($_COOKIE)) {
      $this->login_error = self::ERROR_COOKIES_DISABLED;
      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) {
        $host = null;
      }
    }
    else if (!empty($config['default_host']) && $host != rcube_utils::parse_host($config['default_host'])) {
      $host = null;
    }

    if (!$host) {
      $this->login_error = self::ERROR_INVALID_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);
    }

    if (!isset($config['login_lc'])) {
      $config['login_lc'] = 2; // default
    }

    // Convert username to lowercase. If storage backend
    // is case-insensitive we need to store always the same username (#1487113)
    if ($config['login_lc']) {
      if ($config['login_lc'] == 2 || $config['login_lc'] === true) {
        $username = mb_strtolower($username);
      }
      else if (strpos($username, '@')) {
        // lowercase domain name
        list($local, $domain) = explode('@', $username);
        $username = $local . '@' . mb_strtolower($domain);
      }
    }

    // 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);
    $username = rcube_utils::idn_to_ascii($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 (!$storage->connect($host, $username, $pass, $port, $ssl)) {
      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();

      // 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']   = time();

      if (isset($_REQUEST['_timezone']) && $_REQUEST['_timezone'] != '_default_')
        $_SESSION['timezone'] = rcube_utils::get_input_value('_timezone', rcube_utils::INPUT_GPC);

      // force reloading complete list of subscribed mailboxes
      $storage->clear_cache('mailboxes', true);

      return true;
    }

    return false;
  }


    /**
     * Returns error code of last login operation
     *
     * @return int Error code
     */
    public function login_error()
    {
        if ($this->login_error) {
            return $this->login_error;
        }

        if ($this->storage && $this->storage->get_error_code() < -1) {
            return self::ERROR_STORAGE;
        }
    }


  /**
   * 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);
      $post_user = rcube_utils::get_input_value('_user', rcube_utils::INPUT_POST);

      list(, $domain) = explode('@', $post_user);

      // direct match in default_host array
      if ($default_host[$post_host] || in_array($post_host, array_values($default_host))) {
        $host = $post_host;
      }
      // try to select host by mail domain
      else if (!empty($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();
  }


  /**
   * 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)) {
      if (strpos($p, 'http') === 0)
        return $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();
    }

    // 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);
    }


    /**
     * 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)
    {
        $table = new html_table($attrib);

        // 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)) {
                $timestamp = rcube_utils::strtotime($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') {
            $attrib['is_escaped'] = true;
            $select = new html_select($attrib);

            // add no-selection option
            if ($attrib['noselection']) {
                $select->add(html::quote($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->include_script('treelist.js');
            $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, 'is_escaped' => true);
        $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']) {
            $select->add(html::quote($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');
        $realnames = $this->config->get('show_real_foldernames');

        $out = '';
        foreach ($arrFolders as $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_output::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));

            if (!empty($folder['folders'])) {
                $out .= html::div('treetoggle ' . ($is_collapsed ? 'collapsed' : 'expanded'), '&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 $folder) {
            // skip exceptions (and its subfolders)
            if (!empty($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;', $nestLevel*4) . html::quote($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
     * @param bool   $with_path Enable path localization
     *
     * @return string Localized folder name in UTF-8 encoding
     */
    public function localize_foldername($name, $with_path = true)
    {
        $realnames = $this->config->get('show_real_foldernames');

        // try to localize path of the folder
        if ($with_path && !$realnames) {
            $storage   = $this->get_storage();
            $delimiter = $storage->get_hierarchy_delimiter();
            $path      = explode($delimiter, $name);
            $count     = count($path);

            if ($count > 1) {
                for ($i = 0; $i < $count; $i++) {
                    $folder = implode($delimiter, array_slice($path, 0, -$i));
                    if ($folder_class = $this->folder_classname($folder)) {
                        $name = implode($delimiter, array_slice($path, $count - $i));
                        return $this->gettext($folder_class) . $delimiter . rcube_charset::convert($name, 'UTF7-IMAP');
                    }
                }
            }
        }

        if (!$realnames && ($folder_class = $this->folder_classname($name))) {
            return $this->gettext($folder_class);
        }

        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 ($quota['total'] > 0) {
            if (!isset($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 {
            $unlimited               = $this->config->get('quota_zero_as_unlimited');
            $quota_result['title']   = $this->gettext($unlimited ? 'unlimited' : 'unknown');
            $quota_result['per…