settings.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Auth plugin "LDAP SyncPlus" - Settings
 *
 * @package    auth_ldap_syncplus
 * @copyright  2014 Alexander Bias, Ulm University <alexander.bias@uni-ulm.de>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die;

if ($ADMIN->fulltree) {

    if (!function_exists('ldap_connect')) {
        $settings->add(new admin_setting_heading('auth_ldap_syncplus_noextension', '',
                get_string('auth_ldap_noextension', 'auth_ldap')));
    } else {

        // We use a couple of custom admin settings since we need to massage the data before it is inserted into the DB.
        require_once($CFG->dirroot.'/auth/ldap/classes/admin_setting_special_lowercase_configtext.php');
        require_once($CFG->dirroot.'/auth/ldap/classes/admin_setting_special_contexts_configtext.php');
        require_once($CFG->dirroot.'/auth/ldap/classes/admin_setting_special_ntlm_configtext.php');

        // We need to use some of the Moodle LDAP constants / functions to create the list of options.
        require_once($CFG->dirroot.'/auth/ldap/auth.php');

        // We need to use some of the Moodle LDAP Syncplus constants / functions to create the list of options.
        require_once($CFG->dirroot.'/auth/ldap_syncplus/locallib.php');

        // Introductory explanation.
        $settings->add(new admin_setting_heading('auth_ldap_syncplus/pluginname', '',
                new lang_string('auth_ldapdescription', 'auth_ldap')));

        // LDAP server settings.
        $settings->add(new admin_setting_heading('auth_ldap_syncplus/ldapserversettings',
                new lang_string('auth_ldap_server_settings', 'auth_ldap'), ''));

        // Host.
        $settings->add(new admin_setting_configtext('auth_ldap_syncplus/host_url',
                get_string('auth_ldap_host_url_key', 'auth_ldap'),
                get_string('auth_ldap_host_url', 'auth_ldap'), '', PARAM_RAW_TRIMMED));

        // Version.
        $versions = array();
        $versions[2] = '2';
        $versions[3] = '3';
        $settings->add(new admin_setting_configselect('auth_ldap_syncplus/ldap_version',
                new lang_string('auth_ldap_version_key', 'auth_ldap'),
                new lang_string('auth_ldap_version', 'auth_ldap'), 3, $versions));

        // Start TLS.
        $yesno = array(
            new lang_string('no'),
            new lang_string('yes'),
        );