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-rw-r--r--plugins/acl/acl.php779
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diff --git a/plugins/acl/acl.php b/plugins/acl/acl.php
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+<?php
+
+/**
+ * Folders Access Control Lists Management (RFC4314, RFC2086)
+ *
+ * @version @package_version@
+ * @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 ? $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' ? true : false;
+
+ // 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 $acl2 ACL rights array (or string)
+ *
+ * @param int Comparision result, 2 - full match, 1 - partial match, 0 - no match
+ */
+ function acl_compare($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
+ $config['search_fields'] = array_values($config['fieldmap']);
+ $config['required_fields'] = array($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;
+ }
+}