moodle-auth_jwt/auth.php
2016-08-19 13:03:55 +10:00

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