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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/>.

/**
 * Web service auth plugin, reserves username, prevents normal login.
 * TODO: add IP restrictions and some other features - MDL-17135
 *
 * @package    auth_webservice
 * @copyright  2008 Petr Skoda (http://skodak.org)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

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

/**
 * Web service auth plugin.
 */
class auth_plugin_webservice extends auth_plugin_base {

/**
     * Constructor.
     */
    public function __construct() {
        $this->authtype = 'webservice';
        $this->config = get_config('auth_webservice');
    }

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

/**
     * Returns true if the username and password work and false if they are
     * wrong or don't exist.
     *
     * @param string $username The username (with system magic quotes)
     * @param string $password The password (with system magic quotes)
     *
     * @return bool Authentication success or failure.
     */
    function user_login($username, $password) {
        // normla logins not allowed!
        return false;
    }

/**
     * Custom auth hook for web services.
     * @param string $username
     * @param string $password
     * @return bool success
     */
    function user_login_webservice($username, $password) {
        global $CFG, $DB;
        // special web service login
        if ($user = $DB->get_record('user', array('username'=>$username, 'mnethostid'=>$CFG->mnet_localhost_id))) {
            return validate_internal_user_password($user, $password);
        }
        return false;
    }

/**
     * Updates the user's password.
     *
     * called when the user password is updated.
     *
     * @param  object  $user        User table object  (with system magic quotes)
     * @param  string  $newpassword Plaintext password (with system magic quotes)
     * @return boolean result
     *
     */
    function user_update_password($user, $newpassword) {
        $user = get_complete_user_data('id', $user->id);
        // This will also update the stored hash to the latest algorithm
        // if the existing hash is using an out-of-date algorithm (or the
        // legacy md5 algorithm).
        return update_internal_user_password($user, $newpassword);
    }

/**
     * Returns true if this authentication plugin is 'internal'.
     *
     * Webserice auth doesn't use password fields, it uses only tokens.
     *
     * @return bool
     */
    function is_internal() {
        return false;
    }

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

/**
     * Returns the URL for changing the user's pw, or empty if the default can
     * be used.
     *
     * @return moodle_url
     */
    function change_password_url() {
        return null;
    }

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

/**
     * Confirm the new user as registered. This should normally not be used,
     * but it may be necessary if the user auth_method is changed to manual
     * before the user is confirmed.
     */
    function user_confirm($username, $confirmsecret = null) {
        return AUTH_CONFIRM_ERROR;
    }

}