C:/xampp/htdocs/moodle/auth/manual/auth.php

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<?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/>.

defined('MOODLE_INTERNAL') || die();

require_once($CFG->libdir.'/authlib.php');

class auth_plugin_manual extends auth_plugin_base {

    function auth_plugin_manual() {
        $this->authtype = 'manual';
        $this->config = get_config('auth/manual');
    }

    function user_login($username, $password) {
        global $CFG, $DB, $USER;
        if (!$user = $DB->get_record('user', array('username'=>$username, 'mnethostid'=>$CFG->mnet_localhost_id))) {
            return false;
        }
        if (!validate_internal_user_password($user, $password)) {
            return false;
        }
        if ($password === 'changeme') {
            // force the change - this is deprecated and it makes sense only for manual auth,
            // because most other plugins can not change password easily or
            // passwords are always specified by users
            set_user_preference('auth_forcepasswordchange', true, $user->id);
        }
        return true;
    }

    function user_update_password($user, $newpassword) {
        $user = get_complete_user_data('id', $user->id);
        return update_internal_user_password($user, $newpassword);
    }

    function prevent_local_passwords() {
        return false;
    }

    function is_internal() {
        return true;
    }

    function can_change_password() {
        return true;
    }

    function change_password_url() {
        return null;
    }

    function can_reset_password() {
        return true;
    }

    function config_form($config, $err, $user_fields) {
        include 'config.html';
    }

    function process_config($config) {
        return true;
    }

    function user_confirm($username, $confirmsecret = null) {
        global $DB;

        $user = get_complete_user_data('username', $username);

        if (!empty($user)) {
            if ($user->confirmed) {
                return AUTH_CONFIRM_ALREADY;
            } else {
                $DB->set_field("user", "confirmed", 1, array("id"=>$user->id));
                $DB->set_field("user", "firstaccess", time(), array("id"=>$user->id));
                return AUTH_CONFIRM_OK;
            }
        } else  {
            return AUTH_CONFIRM_ERROR;
        }
    }

}