452 lines
12 KiB
PHP
452 lines
12 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* User key auth method.
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*
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* @package auth_userkey
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* @copyright 2016 Dmitrii Metelkin (dmitriim@catalyst-au.net)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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use auth_userkey\core_userkey_manager;
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use auth_userkey\userkey_manager_interface;
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require_once($CFG->libdir . "/externallib.php");
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require_once($CFG->libdir.'/authlib.php');
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/**
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* User key authentication plugin.
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*/
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class auth_plugin_userkey extends auth_plugin_base {
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/**
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* Default mapping field.
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*/
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const DEFAULT_MAPPING_FIELD = 'email';
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/**
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* User key manager.
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*
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* @var userkey_manager_interface
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*/
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protected $userkeymanager;
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/**
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* Defaults for config form.
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*
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* @var array
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*/
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protected $defaults = array(
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'mappingfield' => self::DEFAULT_MAPPING_FIELD,
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'keylifetime' => 60,
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'iprestriction' => 0,
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'redirecturl' => '',
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// TODO: use this field when implementing user creation. 'createuser' => 0.
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);
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/**
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* Constructor.
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*/
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public function __construct() {
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$this->authtype = 'userkey';
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$this->config = get_config('auth_userkey');
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}
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/**
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* Don't allow login using login form.
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*
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* @param string $username The username (with system magic quotes)
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* @param string $password The password (with system magic quotes)
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*
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* @return bool Authentication success or failure.
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*/
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public function user_login($username, $password) {
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return false;
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}
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/**
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* Login user using userkey and return URL to redirect after.
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*
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* @return string URL to redirect.
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*
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* @throws \moodle_exception If something went wrong.
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*/
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public function user_login_userkey() {
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global $DB, $SESSION, $CFG;
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$keyvalue = required_param('key', PARAM_ALPHANUM);
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$wantsurl = optional_param('wantsurl', '', PARAM_URL);
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$options = array(
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'script' => core_userkey_manager::CORE_USER_KEY_MANAGER_SCRIPT,
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'value' => $keyvalue
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);
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if (!$key = $DB->get_record('user_private_key', $options)) {
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print_error('invalidkey');
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}
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if (!isset($this->userkeymanager)) {
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$userkeymanager = new core_userkey_manager($key->userid, $this->config);
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$this->set_userkey_manager($userkeymanager);
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}
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$this->userkeymanager->delete_key();
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if (!empty($key->validuntil) and $key->validuntil < time()) {
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print_error('expiredkey');
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}
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if ($key->iprestriction) {
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$remoteaddr = getremoteaddr(null);
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if (empty($remoteaddr) or !address_in_subnet($remoteaddr, $key->iprestriction)) {
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print_error('ipmismatch');
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}
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}
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if (!$user = $DB->get_record('user', array('id' => $key->userid))) {
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print_error('invaliduserid');
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}
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$user = get_complete_user_data('id', $user->id);
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complete_user_login($user);
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// Identify this session as using user key auth method.
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$SESSION->userkey = true;
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if (!empty($wantsurl)) {
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return $wantsurl;
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} else {
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return $CFG->wwwroot;
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}
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}
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/**
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* Don't store local passwords.
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*
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* @return bool True.
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*/
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public function prevent_local_passwords() {
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return true;
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}
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/**
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* Returns true if this authentication plugin is external.
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*
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* @return bool False.
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*/
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public function is_internal() {
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return false;
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}
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/**
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* The plugin can't change the user's password.
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*
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* @return bool False.
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*/
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public function can_change_password() {
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return false;
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}
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/**
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* Prints a form for configuring this authentication plugin.
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*
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* This function is called from admin/auth.php, and outputs a full page with
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* a form for configuring this plugin.
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*
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* @param object $config
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* @param object $err
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* @param array $userfields
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*/
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public function config_form($config, $err, $userfields) {
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global $CFG, $OUTPUT;
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$config = (object) array_merge($this->defaults, (array) $config );
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include("settings.html");
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}
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/**
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* A chance to validate form data, and last chance to
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* do stuff before it is inserted in config_plugin
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*
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* @param object $form with submitted configuration settings (without system magic quotes)
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* @param array $err array of error messages
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*
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* @return array of any errors
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*/
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public function validate_form($form, &$err) {
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if ((int)$form->keylifetime == 0) {
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$err['keylifetime'] = get_string('incorrectkeylifetime', 'auth_userkey');
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}
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if (!empty($form->redirecturl) && filter_var($form->redirecturl, FILTER_VALIDATE_URL) === false) {
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$err['redirecturl'] = get_string('incorrectredirecturl', 'auth_userkey');
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}
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}
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/**
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* Process and stores configuration data for this authentication plugin.
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*
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* @param object $config Config object from the form.
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*
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* @return bool
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*/
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public function process_config($config) {
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foreach ($this->defaults as $key => $value) {
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if (!isset($this->config->$key) || $config->$key != $this->config->$key) {
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set_config($key, $config->$key, 'auth_userkey');
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}
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}
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return true;
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}
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/**
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* Set userkey manager.
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*
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* @param \auth_userkey\userkey_manager_interface $keymanager
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*/
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public function set_userkey_manager(userkey_manager_interface $keymanager) {
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$this->userkeymanager = $keymanager;
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}
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/**
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* Return mapping field to find a lms user.
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*
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* @return string
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*/
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public function get_mapping_field() {
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if (isset($this->config->mappingfield) && !empty($this->config->mappingfield)) {
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return $this->config->mappingfield;
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}
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return self::DEFAULT_MAPPING_FIELD;
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}
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/**
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* Check if we need to create a new user.
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*
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* @return bool
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*/
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protected function should_create_user() {
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if (isset($this->config->createuser)) {
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return $this->config->createuser;
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}
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return false;
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}
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/**
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* Check if restriction by IP is enabled.
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*
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* @return bool
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*/
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protected function is_iprestriction_enabled() {
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if (isset($this->config->iprestriction) && $this->config->iprestriction == true) {
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return true;
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}
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return false;
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}
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/**
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* Create a new user.
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*/
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protected function create_user() {
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// TODO:
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// 1. Validate user
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// 2. Create user.
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// 3. Throw exception if something went wrong.
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}
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/**
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* Return login URL.
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*
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* @param array|stdClass $data User data.
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*
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* @return string Login URL.
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*
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* @throws \invalid_parameter_exception
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*/
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public function get_login_url($data) {
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global $CFG, $DB;
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$data = (array)$data;
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$mappingfield = $this->get_mapping_field();
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if (!isset($data[$mappingfield]) || empty($data[$mappingfield])) {
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throw new invalid_parameter_exception('Required field "' . $mappingfield . '" is not set or empty.');
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}
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if ($this->is_iprestriction_enabled() && !isset($data['ip'])) {
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throw new invalid_parameter_exception('Required parameter "ip" is not set.');
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}
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$params = array(
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$mappingfield => $data[$mappingfield],
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'mnethostid' => $CFG->mnet_localhost_id,
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);
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$user = $DB->get_record('user', $params);
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if (empty($user)) {
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if (!$this->should_create_user()) {
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throw new invalid_parameter_exception('User is not exist');
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} else {
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$user = $this->create_user();
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}
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}
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if (!isset($this->userkeymanager)) {
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$ips = isset($data['ip']) ? $data['ip'] : null;
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$userkeymanager = new core_userkey_manager($user->id, $this->config, $ips);
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$this->set_userkey_manager($userkeymanager);
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}
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$userkey = $this->userkeymanager->create_key();
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return $CFG->wwwroot . '/auth/userkey/login.php?key=' . $userkey;
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}
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/**
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* Return a list of mapping fields.
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*
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* @return array
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*/
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public function get_allowed_mapping_fields() {
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return array(
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'username' => get_string('username'),
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'email' => get_string('email'),
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'idnumber' => get_string('idnumber'),
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);
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}
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/**
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* Return a mapping parameter for request_login_url_parameters().
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*
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* @return array
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*/
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protected function get_mapping_parameter() {
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$mappingfield = $this->get_mapping_field();
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switch ($mappingfield) {
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case 'username':
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$parameter = array(
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'username' => new external_value(
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PARAM_USERNAME,
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'Username'
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),
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);
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break;
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case 'email':
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$parameter = array(
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'email' => new external_value(
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PARAM_EMAIL,
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'A valid email address'
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),
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);
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break;
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case 'idnumber':
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$parameter = array(
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'idnumber' => new external_value(
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PARAM_RAW,
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'An arbitrary ID code number perhaps from the institution'
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),
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);
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break;
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default:
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$parameter = array();
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break;
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}
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return $parameter;
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}
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/**
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* Return user fields parameters for request_login_url_parameters().
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*
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* @return array
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*/
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protected function get_user_fields_parameters() {
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$parameters = array();
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if ($this->is_iprestriction_enabled()) {
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$parameters['ip'] = new external_value(
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PARAM_HOST,
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'User IP address'
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);
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}
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// TODO: add more fields here when we implement user creation.
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return $parameters;
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}
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/**
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* Return parameters for request_login_url_parameters().
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*
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* @return array
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*/
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public function get_request_login_url_user_parameters() {
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$parameters = array_merge($this->get_mapping_parameter(), $this->get_user_fields_parameters());
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return $parameters;
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}
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/**
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* Check if we should redirect a user after logout.
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*
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* @return bool
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*/
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protected function should_redirect() {
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global $SESSION;
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if (!isset($SESSION->userkey)) {
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return false;
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}
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if (!isset($this->config->redirecturl)) {
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return false;
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}
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if (empty($this->config->redirecturl)) {
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return false;
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}
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return true;
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}
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/**
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* Logout page hook.
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*
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* Override redirect URL after logout.
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*
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* @see auth_plugin_base::logoutpage_hook()
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*/
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public function logoutpage_hook() {
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global $redirect;
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if ($this->should_redirect()) {
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$redirect = $this->config->redirecturl;
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}
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}
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}
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