auth_token/auth.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/>.

/**
 * Authorization by tokens.
 *
 * @package   auth_token
 * @copyright 2017 "Valentin Popov" <info@valentineus.link>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined("MOODLE_INTERNAL") || die();

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

/**
 * Plugin user authentication plugin.
 */
class auth_plugin_token extends auth_plugin_base {
    /**
     * Constructor.
     */
    public function __construct() {
        $this->authtype = "token";
        $this->config = get_config("auth_token");
    }

    /**
     * Old syntax of class constructor. Deprecated in PHP7.
     *
     * @deprecated since Moodle 3.1
     */
    public function auth_plugin_token() {
        debugging("Use of class name as constructor is deprecated", DEBUG_DEVELOPER);
        self::__construct();
    }

    /**
     * Returns true if the username and password work or don't exist and false
     * if the user exists and the password is wrong.
     *
     * @param  string $username The username
     * @param  string $password The password
     * @return boolean          Authentication success or failure.
     */
    public function user_login($username, $password) {
        global $CFG, $DB;

        if ($user = $DB->get_record("user", array("username" => $username, "mnethostid" => $GFG->mnet_localhost_id))) {
            return validate_internal_user_password($user, $password);
        }

        return false;
    }

    /**
     * Updates the user's password.
     * Called when the user password is updated.
     *
     * @param  object $user        User table object
     * @param  string $newpassword Plaintext password
     * @return boolean             Password updated success or failure.
     *
     */
    public function user_update_password($user, $password) {
        $user = get_complete_user_data("id", $user->id);
        return update_internal_user_password($user, $password);
    }

    /**
     * Indicates if password hashes should be stored in local moodle database.
     *
     * @return boolean
     */
    public function prevent_local_passwords() {
        return false;
    }

    /**
     * Returns true if this authentication plugin is 'internal'.
     *
     * @return boolean
     */
    public function is_internal() {
        return true;
    }

    /**
     * Returns true if this authentication plugin can change the user's
     * password.
     *
     * @return boolean
     */
    public function can_change_password() {
        return false;
    }

    /**
     * Returns true if plugin allows resetting of internal password.
     *
     * @return boolean
     */
    public function can_reset_password() {
        return false;
    }

    /**
     * Returns true if plugin can be manually set.
     *
     * @return boolean
     */
    public function can_be_manually_set() {
        return true;
    }
}