--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/acl/acl.php	Thu Jan 04 15:50:29 2018 -0500
@@ -0,0 +1,781 @@
+<?php
+
+/**
+ * Folders Access Control Lists Management (RFC4314, RFC2086)
+ *
+ * @author Aleksander Machniak <alec@alec.pl>
+ *
+ * Copyright (C) 2011-2012, Kolab Systems AG
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ */
+
+class acl extends rcube_plugin
+{
+    public $task = 'settings|addressbook|calendar';
+
+    private $rc;
+    private $supported = null;
+    private $mbox;
+    private $ldap;
+    private $specials = array('anyone', 'anonymous');
+
+    /**
+     * Plugin initialization
+     */
+    function init()
+    {
+        $this->rc = rcmail::get_instance();
+
+        // Register hooks
+        $this->add_hook('folder_form', array($this, 'folder_form'));
+        // kolab_addressbook plugin
+        $this->add_hook('addressbook_form', array($this, 'folder_form'));
+        $this->add_hook('calendar_form_kolab', array($this, 'folder_form'));
+        // Plugin actions
+        $this->register_action('plugin.acl', array($this, 'acl_actions'));
+        $this->register_action('plugin.acl-autocomplete', array($this, 'acl_autocomplete'));
+    }
+
+    /**
+     * Handler for plugin actions (AJAX)
+     */
+    function acl_actions()
+    {
+        $action = trim(rcube_utils::get_input_value('_act', rcube_utils::INPUT_GPC));
+
+        // Connect to IMAP
+        $this->rc->storage_init();
+
+        // Load localization and configuration
+        $this->add_texts('localization/');
+        $this->load_config();
+
+        if ($action == 'save') {
+            $this->action_save();
+        }
+        else if ($action == 'delete') {
+            $this->action_delete();
+        }
+        else if ($action == 'list') {
+            $this->action_list();
+        }
+
+        // Only AJAX actions
+        $this->rc->output->send();
+    }
+
+    /**
+     * Handler for user login autocomplete request
+     */
+    function acl_autocomplete()
+    {
+        $this->load_config();
+
+        $search = rcube_utils::get_input_value('_search', rcube_utils::INPUT_GPC, true);
+        $reqid  = rcube_utils::get_input_value('_reqid', rcube_utils::INPUT_GPC);
+        $users  = array();
+        $keys   = array();
+
+        if ($this->init_ldap()) {
+            $max  = (int) $this->rc->config->get('autocomplete_max', 15);
+            $mode = (int) $this->rc->config->get('addressbook_search_mode');
+
+            $this->ldap->set_pagesize($max);
+            $result = $this->ldap->search('*', $search, $mode);
+
+            foreach ($result->records as $record) {
+                $user = $record['uid'];
+
+                if (is_array($user)) {
+                    $user = array_filter($user);
+                    $user = $user[0];
+                }
+
+                if ($user) {
+                    $display = rcube_addressbook::compose_search_name($record);
+                    $user    = array('name' => $user, 'display' => $display);
+                    $users[] = $user;
+                    $keys[]  = $display ?: $user['name'];
+                }
+            }
+
+            if ($this->rc->config->get('acl_groups')) {
+                $prefix      = $this->rc->config->get('acl_group_prefix');
+                $group_field = $this->rc->config->get('acl_group_field', 'name');
+                $result      = $this->ldap->list_groups($search, $mode);
+
+                foreach ($result as $record) {
+                    $group    = $record['name'];
+                    $group_id = is_array($record[$group_field]) ? $record[$group_field][0] : $record[$group_field];
+
+                    if ($group) {
+                        $users[] = array('name' => ($prefix ?: '') . $group_id, 'display' => $group, 'type' => 'group');
+                        $keys[]  = $group;
+                    }
+                }
+            }
+        }
+
+        if (count($users)) {
+            // sort users index
+            asort($keys, SORT_LOCALE_STRING);
+            // re-sort users according to index
+            foreach ($keys as $idx => $val) {
+                $keys[$idx] = $users[$idx];
+            }
+            $users = array_values($keys);
+        }
+
+        $this->rc->output->command('ksearch_query_results', $users, $search, $reqid);
+        $this->rc->output->send();
+    }
+
+    /**
+     * Handler for 'folder_form' hook
+     *
+     * @param array $args Hook arguments array (form data)
+     *
+     * @return array Hook arguments array
+     */
+    function folder_form($args)
+    {
+        $mbox_imap = $args['options']['name'];
+        $myrights  = $args['options']['rights'];
+
+        // Edited folder name (empty in create-folder mode)
+        if (!strlen($mbox_imap)) {
+            return $args;
+        }
+/*
+        // Do nothing on protected folders (?)
+        if ($args['options']['protected']) {
+            return $args;
+        }
+*/
+        // Get MYRIGHTS
+        if (empty($myrights)) {
+            return $args;
+        }
+
+        // Load localization and include scripts
+        $this->load_config();
+        $this->specials = $this->rc->config->get('acl_specials', $this->specials);
+        $this->add_texts('localization/', array('deleteconfirm', 'norights',
+            'nouser', 'deleting', 'saving', 'newuser', 'editperms'));
+        $this->rc->output->add_label('save', 'cancel');
+        $this->include_script('acl.js');
+        $this->rc->output->include_script('list.js');
+        $this->include_stylesheet($this->local_skin_path().'/acl.css');
+
+        // add Info fieldset if it doesn't exist
+        if (!isset($args['form']['props']['fieldsets']['info']))
+            $args['form']['props']['fieldsets']['info'] = array(
+                'name'  => $this->rc->gettext('info'),
+                'content' => array());
+
+        // Display folder rights to 'Info' fieldset
+        $args['form']['props']['fieldsets']['info']['content']['myrights'] = array(
+            'label' => rcube::Q($this->gettext('myrights')),
+            'value' => $this->acl2text($myrights)
+        );
+
+        // Return if not folder admin
+        if (!in_array('a', $myrights)) {
+            return $args;
+        }
+
+        // The 'Sharing' tab
+        $this->mbox = $mbox_imap;
+        $this->rc->output->set_env('acl_users_source', (bool) $this->rc->config->get('acl_users_source'));
+        $this->rc->output->set_env('mailbox', $mbox_imap);
+        $this->rc->output->add_handlers(array(
+            'acltable'  => array($this, 'templ_table'),
+            'acluser'   => array($this, 'templ_user'),
+            'aclrights' => array($this, 'templ_rights'),
+        ));
+
+        $this->rc->output->set_env('autocomplete_max', (int)$this->rc->config->get('autocomplete_max', 15));
+        $this->rc->output->set_env('autocomplete_min_length', $this->rc->config->get('autocomplete_min_length'));
+        $this->rc->output->add_label('autocompletechars', 'autocompletemore');
+
+        $args['form']['sharing'] = array(
+            'name'    => rcube::Q($this->gettext('sharing')),
+            'content' => $this->rc->output->parse('acl.table', false, false),
+        );
+
+        return $args;
+    }
+
+    /**
+     * Creates ACL rights table
+     *
+     * @param array $attrib Template object attributes
+     *
+     * @return string HTML Content
+     */
+    function templ_table($attrib)
+    {
+        if (empty($attrib['id']))
+            $attrib['id'] = 'acl-table';
+
+        $out = $this->list_rights($attrib);
+
+        $this->rc->output->add_gui_object('acltable', $attrib['id']);
+
+        return $out;
+    }
+
+    /**
+     * Creates ACL rights form (rights list part)
+     *
+     * @param array $attrib Template object attributes
+     *
+     * @return string HTML Content
+     */
+    function templ_rights($attrib)
+    {
+        // Get supported rights
+        $supported = $this->rights_supported();
+
+        // give plugins the opportunity to adjust this list
+        $data = $this->rc->plugins->exec_hook('acl_rights_supported',
+            array('rights' => $supported, 'folder' => $this->mbox, 'labels' => array()));
+        $supported = $data['rights'];
+
+        // depending on server capability either use 'te' or 'd' for deleting msgs
+        $deleteright = implode(array_intersect(str_split('ted'), $supported));
+
+        $out = '';
+        $ul  = '';
+        $input = new html_checkbox();
+
+        // Advanced rights
+        $attrib['id'] = 'advancedrights';
+        foreach ($supported as $key => $val) {
+            $id = "acl$val";
+            $ul .= html::tag('li', null,
+                $input->show('', array(
+                    'name' => "acl[$val]", 'value' => $val, 'id' => $id))
+                . html::label(array('for' => $id, 'title' => $this->gettext('longacl'.$val)),
+                    $this->gettext('acl'.$val)));
+        }
+
+        $out = html::tag('ul', $attrib, $ul, html::$common_attrib);
+
+        // Simple rights
+        $ul = '';
+        $attrib['id'] = 'simplerights';
+        $items = array(
+            'read' => 'lrs',
+            'write' => 'wi',
+            'delete' => $deleteright,
+            'other' => preg_replace('/[lrswi'.$deleteright.']/', '', implode($supported)),
+        );
+
+        // give plugins the opportunity to adjust this list
+        $data = $this->rc->plugins->exec_hook('acl_rights_simple',
+            array('rights' => $items, 'folder' => $this->mbox, 'labels' => array(), 'titles' => array()));
+
+        foreach ($data['rights'] as $key => $val) {
+            $id = "acl$key";
+            $ul .= html::tag('li', null,
+                $input->show('', array(
+                    'name' => "acl[$val]", 'value' => $val, 'id' => $id))
+                . html::label(array('for' => $id, 'title' => $data['titles'][$key] ?: $this->gettext('longacl'.$key)),
+                    $data['labels'][$key] ?: $this->gettext('acl'.$key)));
+        }
+
+        $out .= "\n" . html::tag('ul', $attrib, $ul, html::$common_attrib);
+
+        $this->rc->output->set_env('acl_items', $data['rights']);
+
+        return $out;
+    }
+
+    /**
+     * Creates ACL rights form (user part)
+     *
+     * @param array $attrib Template object attributes
+     *
+     * @return string HTML Content
+     */
+    function templ_user($attrib)
+    {
+        // Create username input
+        $attrib['name'] = 'acluser';
+
+        $textfield = new html_inputfield($attrib);
+
+        $fields['user'] = html::label(array('for' => $attrib['id']), $this->gettext('username'))
+            . ' ' . $textfield->show();
+
+        // Add special entries
+        if (!empty($this->specials)) {
+            foreach ($this->specials as $key) {
+                $fields[$key] = html::label(array('for' => 'id'.$key), $this->gettext($key));
+            }
+        }
+
+        $this->rc->output->set_env('acl_specials', $this->specials);
+
+        // Create list with radio buttons
+        if (count($fields) > 1) {
+            $ul = '';
+            $radio = new html_radiobutton(array('name' => 'usertype'));
+            foreach ($fields as $key => $val) {
+                $ul .= html::tag('li', null, $radio->show($key == 'user' ? 'user' : '',
+                        array('value' => $key, 'id' => 'id'.$key))
+                    . $val);
+            }
+
+            $out = html::tag('ul', array('id' => 'usertype', 'class' => $attrib['class']), $ul, html::$common_attrib);
+        }
+        // Display text input alone
+        else {
+            $out = $fields['user'];
+        }
+
+        return $out;
+    }
+
+    /**
+     * Creates ACL rights table
+     *
+     * @param array $attrib Template object attributes
+     *
+     * @return string HTML Content
+     */
+    private function list_rights($attrib=array())
+    {
+        // Get ACL for the folder
+        $acl = $this->rc->storage->get_acl($this->mbox);
+
+        if (!is_array($acl)) {
+            $acl = array();
+        }
+
+        // Keep special entries (anyone/anonymous) on top of the list
+        if (!empty($this->specials) && !empty($acl)) {
+            foreach ($this->specials as $key) {
+                if (isset($acl[$key])) {
+                    $acl_special[$key] = $acl[$key];
+                    unset($acl[$key]);
+                }
+            }
+        }
+
+        // Sort the list by username
+        uksort($acl, 'strnatcasecmp');
+
+        if (!empty($acl_special)) {
+            $acl = array_merge($acl_special, $acl);
+        }
+
+        // Get supported rights and build column names
+        $supported = $this->rights_supported();
+
+        // give plugins the opportunity to adjust this list
+        $data = $this->rc->plugins->exec_hook('acl_rights_supported',
+            array('rights' => $supported, 'folder' => $this->mbox, 'labels' => array()));
+        $supported = $data['rights'];
+
+        // depending on server capability either use 'te' or 'd' for deleting msgs
+        $deleteright = implode(array_intersect(str_split('ted'), $supported));
+
+        // Use advanced or simple (grouped) rights
+        $advanced = $this->rc->config->get('acl_advanced_mode');
+
+        if ($advanced) {
+            $items = array();
+            foreach ($supported as $sup) {
+                $items[$sup] = $sup;
+            }
+        }
+        else {
+            $items = array(
+                'read' => 'lrs',
+                'write' => 'wi',
+                'delete' => $deleteright,
+                'other' => preg_replace('/[lrswi'.$deleteright.']/', '', implode($supported)),
+            );
+
+            // give plugins the opportunity to adjust this list
+            $data = $this->rc->plugins->exec_hook('acl_rights_simple',
+                array('rights' => $items, 'folder' => $this->mbox, 'labels' => array()));
+            $items = $data['rights'];
+        }
+
+        // Create the table
+        $attrib['noheader'] = true;
+        $table = new html_table($attrib);
+
+        // Create table header
+        $table->add_header('user', $this->gettext('identifier'));
+        foreach (array_keys($items) as $key) {
+            $label = $data['labels'][$key] ?: $this->gettext('shortacl'.$key);
+            $table->add_header(array('class' => 'acl'.$key, 'title' => $label), $label);
+        }
+
+        $js_table = array();
+        foreach ($acl as $user => $rights) {
+            if ($this->rc->storage->conn->user == $user) {
+                continue;
+            }
+
+            // filter out virtual rights (c or d) the server may return
+            $userrights = array_intersect($rights, $supported);
+            $userid = rcube_utils::html_identifier($user);
+
+            if (!empty($this->specials) && in_array($user, $this->specials)) {
+                $user = $this->gettext($user);
+            }
+
+            $table->add_row(array('id' => 'rcmrow'.$userid));
+            $table->add('user', html::a(array('id' => 'rcmlinkrow'.$userid), rcube::Q($user)));
+
+            foreach ($items as $key => $right) {
+                $in = $this->acl_compare($userrights, $right);
+                switch ($in) {
+                    case 2: $class = 'enabled'; break;
+                    case 1: $class = 'partial'; break;
+                    default: $class = 'disabled'; break;
+                }
+                $table->add('acl' . $key . ' ' . $class, '');
+            }
+
+            $js_table[$userid] = implode($userrights);
+        }
+
+        $this->rc->output->set_env('acl', $js_table);
+        $this->rc->output->set_env('acl_advanced', $advanced);
+
+        $out = $table->show();
+
+        return $out;
+    }
+
+    /**
+     * Handler for ACL update/create action
+     */
+    private function action_save()
+    {
+        $mbox  = trim(rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST, true)); // UTF7-IMAP
+        $user  = trim(rcube_utils::get_input_value('_user', rcube_utils::INPUT_POST));
+        $acl   = trim(rcube_utils::get_input_value('_acl', rcube_utils::INPUT_POST));
+        $oldid = trim(rcube_utils::get_input_value('_old', rcube_utils::INPUT_POST));
+
+        $acl    = array_intersect(str_split($acl), $this->rights_supported());
+        $users  = $oldid ? array($user) : explode(',', $user);
+        $result = 0;
+
+        foreach ($users as $user) {
+            $user   = trim($user);
+            $prefix = $this->rc->config->get('acl_groups') ? $this->rc->config->get('acl_group_prefix') : '';
+
+            if ($prefix && strpos($user, $prefix) === 0) {
+                $username = $user;
+            }
+            else if (!empty($this->specials) && in_array($user, $this->specials)) {
+                $username = $this->gettext($user);
+            }
+            else if (!empty($user)) {
+                if (!strpos($user, '@') && ($realm = $this->get_realm())) {
+                    $user .= '@' . rcube_utils::idn_to_ascii(preg_replace('/^@/', '', $realm));
+                }
+                $username = $user;
+            }
+
+            if (!$acl || !$user || !strlen($mbox)) {
+                continue;
+            }
+
+            $user     = $this->mod_login($user);
+            $username = $this->mod_login($username);
+
+            if ($user != $_SESSION['username'] && $username != $_SESSION['username']) {
+                if ($this->rc->storage->set_acl($mbox, $user, $acl)) {
+                    $ret = array('id' => rcube_utils::html_identifier($user),
+                         'username' => $username, 'acl' => implode($acl), 'old' => $oldid);
+                    $this->rc->output->command('acl_update', $ret);
+                    $result++;
+                }
+            }
+        }
+
+        if ($result) {
+            $this->rc->output->show_message($oldid ? 'acl.updatesuccess' : 'acl.createsuccess', 'confirmation');
+        }
+        else {
+            $this->rc->output->show_message($oldid ? 'acl.updateerror' : 'acl.createerror', 'error');
+        }
+    }
+
+    /**
+     * Handler for ACL delete action
+     */
+    private function action_delete()
+    {
+        $mbox = trim(rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST, true)); //UTF7-IMAP
+        $user = trim(rcube_utils::get_input_value('_user', rcube_utils::INPUT_POST));
+
+        $user = explode(',', $user);
+
+        foreach ($user as $u) {
+            $u = trim($u);
+            if ($this->rc->storage->delete_acl($mbox, $u)) {
+                $this->rc->output->command('acl_remove_row', rcube_utils::html_identifier($u));
+            }
+            else {
+                $error = true;
+            }
+        }
+
+        if (!$error) {
+            $this->rc->output->show_message('acl.deletesuccess', 'confirmation');
+        }
+        else {
+            $this->rc->output->show_message('acl.deleteerror', 'error');
+        }
+    }
+
+    /**
+     * Handler for ACL list update action (with display mode change)
+     */
+    private function action_list()
+    {
+        if (in_array('acl_advanced_mode', (array)$this->rc->config->get('dont_override'))) {
+            return;
+        }
+
+        $this->mbox = trim(rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_GPC, true)); // UTF7-IMAP
+        $advanced   = trim(rcube_utils::get_input_value('_mode', rcube_utils::INPUT_GPC));
+        $advanced   = $advanced == 'advanced';
+
+        // Save state in user preferences
+        $this->rc->user->save_prefs(array('acl_advanced_mode' => $advanced));
+
+        $out = $this->list_rights();
+
+        $out = preg_replace(array('/^<table[^>]+>/', '/<\/table>$/'), '', $out);
+
+        $this->rc->output->command('acl_list_update', $out);
+    }
+
+    /**
+     * Creates <UL> list with descriptive access rights
+     *
+     * @param array $rights MYRIGHTS result
+     *
+     * @return string HTML content
+     */
+    function acl2text($rights)
+    {
+        if (empty($rights)) {
+            return '';
+        }
+
+        $supported = $this->rights_supported();
+        $list      = array();
+        $attrib    = array(
+            'name' => 'rcmyrights',
+            'style' => 'margin:0; padding:0 15px;',
+        );
+
+        foreach ($supported as $right) {
+            if (in_array($right, $rights)) {
+                $list[] = html::tag('li', null, rcube::Q($this->gettext('acl' . $right)));
+            }
+        }
+
+        if (count($list) == count($supported))
+            return rcube::Q($this->gettext('aclfull'));
+
+        return html::tag('ul', $attrib, implode("\n", $list));
+    }
+
+    /**
+     * Compares two ACLs (according to supported rights)
+     *
+     * @param array $acl1 ACL rights array (or string)
+     * @param array $acl2 ACL rights array (or string)
+     *
+     * @param int Comparison result, 2 - full match, 1 - partial match, 0 - no match
+     */
+    function acl_compare($acl1, $acl2)
+    {
+        if (!is_array($acl1)) $acl1 = str_split($acl1);
+        if (!is_array($acl2)) $acl2 = str_split($acl2);
+
+        $rights = $this->rights_supported();
+
+        $acl1 = array_intersect($acl1, $rights);
+        $acl2 = array_intersect($acl2, $rights);
+        $res  = array_intersect($acl1, $acl2);
+
+        $cnt1 = count($res);
+        $cnt2 = count($acl2);
+
+        if ($cnt1 == $cnt2)
+            return 2;
+        else if ($cnt1)
+            return 1;
+        else
+            return 0;
+    }
+
+    /**
+     * Get list of supported access rights (according to RIGHTS capability)
+     *
+     * @return array List of supported access rights abbreviations
+     */
+    function rights_supported()
+    {
+        if ($this->supported !== null) {
+            return $this->supported;
+        }
+
+        $capa = $this->rc->storage->get_capability('RIGHTS');
+
+        if (is_array($capa)) {
+            $rights = strtolower($capa[0]);
+        }
+        else {
+            $rights = 'cd';
+        }
+
+        return $this->supported = str_split('lrswi' . $rights . 'pa');
+    }
+
+    /**
+     * Username realm detection.
+     *
+     * @return string Username realm (domain)
+     */
+    private function get_realm()
+    {
+        // When user enters a username without domain part, realm
+        // allows to add it to the username (and display correct username in the table)
+
+        if (isset($_SESSION['acl_username_realm'])) {
+            return $_SESSION['acl_username_realm'];
+        }
+
+        // find realm in username of logged user (?)
+        list($name, $domain) = explode('@', $_SESSION['username']);
+
+        // Use (always existent) ACL entry on the INBOX for the user to determine
+        // whether or not the user ID in ACL entries need to be qualified and how
+        // they would need to be qualified.
+        if (empty($domain)) {
+            $acl = $this->rc->storage->get_acl('INBOX');
+            if (is_array($acl)) {
+                $regexp = '/^' . preg_quote($_SESSION['username'], '/') . '@(.*)$/';
+                foreach (array_keys($acl) as $name) {
+                    if (preg_match($regexp, $name, $matches)) {
+                        $domain = $matches[1];
+                        break;
+                    }
+                }
+            }
+        }
+
+        return $_SESSION['acl_username_realm'] = $domain;
+    }
+
+    /**
+     * Initializes autocomplete LDAP backend
+     */
+    private function init_ldap()
+    {
+        if ($this->ldap) {
+            return $this->ldap->ready;
+        }
+
+        // get LDAP config
+        $config = $this->rc->config->get('acl_users_source');
+
+        if (empty($config)) {
+            return false;
+        }
+
+        // not an array, use configured ldap_public source
+        if (!is_array($config)) {
+            $ldap_config = (array) $this->rc->config->get('ldap_public');
+            $config      = $ldap_config[$config];
+        }
+
+        $uid_field = $this->rc->config->get('acl_users_field', 'mail');
+        $filter    = $this->rc->config->get('acl_users_filter');
+
+        if (empty($uid_field) || empty($config)) {
+            return false;
+        }
+
+        // get name attribute
+        if (!empty($config['fieldmap'])) {
+            $name_field = $config['fieldmap']['name'];
+        }
+        // ... no fieldmap, use the old method
+        if (empty($name_field)) {
+            $name_field = $config['name_field'];
+        }
+
+        // add UID field to fieldmap, so it will be returned in a record with name
+        $config['fieldmap']['name'] = $name_field;
+        $config['fieldmap']['uid']  = $uid_field;
+
+        // search in UID and name fields
+        // $name_field can be in a form of <field>:<modifier> (#1490591)
+        $name_field = preg_replace('/:.*$/', '', $name_field);
+        $search     = array_unique(array($name_field, $uid_field));
+
+        $config['search_fields']   = $search;
+        $config['required_fields'] = array($uid_field);
+
+        // set search filter
+        if ($filter) {
+            $config['filter'] = $filter;
+        }
+
+        // disable vlv
+        $config['vlv'] = false;
+
+        // Initialize LDAP connection
+        $this->ldap = new rcube_ldap($config,
+            $this->rc->config->get('ldap_debug'),
+            $this->rc->config->mail_domain($_SESSION['imap_host']));
+
+        return $this->ldap->ready;
+    }
+
+    /**
+     * Modify user login according to 'login_lc' setting
+     */
+    protected function mod_login($user)
+    {
+        $login_lc = $this->rc->config->get('login_lc');
+
+        if ($login_lc === true || $login_lc == 2) {
+            $user = mb_strtolower($user);
+        }
+        // lowercase domain name
+        else if ($login_lc && strpos($user, '@')) {
+            list($local, $domain) = explode('@', $user);
+            $user = $local . '@' . mb_strtolower($domain);
+        }
+
+        return $user;
+    }
+}