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758 lines
24 KiB
758 lines
24 KiB
<?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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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->libdir.'/filelib.php');
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/**
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* OAuth helper class
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*
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* 1. You can extends oauth_helper to add specific functions, such as twitter extends oauth_helper
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* 2. Call request_token method to get oauth_token and oauth_token_secret, and redirect user to authorize_url,
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* developer needs to store oauth_token and oauth_token_secret somewhere, we will use them to request
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* access token later on
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* 3. User approved the request, and get back to moodle
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* 4. Call get_access_token, it takes previous oauth_token and oauth_token_secret as arguments, oauth_token
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* will be used in OAuth request, oauth_token_secret will be used to bulid signature, this method will
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* return access_token and access_secret, store these two values in database or session
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* 5. Now you can access oauth protected resources by access_token and access_secret using oauth_helper::request
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* method (or get() post())
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*
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* Note:
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* 1. This class only support HMAC-SHA1
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* 2. oauth_helper class don't store tokens and secrets, you must store them manually
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* 3. Some functions are based on http://code.google.com/p/oauth/
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*
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* @package moodlecore
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* @copyright 2010 Dongsheng Cai <dongsheng@moodle.com>
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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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class oauth_helper {
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/** @var string consumer key, issued by oauth provider*/
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protected $consumer_key;
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/** @var string consumer secret, issued by oauth provider*/
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protected $consumer_secret;
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/** @var string oauth root*/
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protected $api_root;
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/** @var string request token url*/
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protected $request_token_api;
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/** @var string authorize url*/
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protected $authorize_url;
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protected $http_method;
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/** @var string */
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protected $access_token_api;
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/** @var curl */
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protected $http;
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/** @var array options to pass to the next curl request */
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protected $http_options;
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/**
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* Contructor for oauth_helper.
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* Subclass can override construct to build its own $this->http
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*
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* @param array $args requires at least three keys, oauth_consumer_key
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* oauth_consumer_secret and api_root, oauth_helper will
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* guess request_token_api, authrize_url and access_token_api
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* based on api_root, but it not always works
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*/
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function __construct($args) {
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if (!empty($args['api_root'])) {
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$this->api_root = $args['api_root'];
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} else {
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$this->api_root = '';
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}
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$this->consumer_key = $args['oauth_consumer_key'];
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$this->consumer_secret = $args['oauth_consumer_secret'];
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if (empty($args['request_token_api'])) {
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$this->request_token_api = $this->api_root . '/request_token';
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} else {
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$this->request_token_api = $args['request_token_api'];
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}
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if (empty($args['authorize_url'])) {
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$this->authorize_url = $this->api_root . '/authorize';
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} else {
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$this->authorize_url = $args['authorize_url'];
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}
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if (empty($args['access_token_api'])) {
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$this->access_token_api = $this->api_root . '/access_token';
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} else {
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$this->access_token_api = $args['access_token_api'];
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}
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if (!empty($args['oauth_callback'])) {
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$this->oauth_callback = new moodle_url($args['oauth_callback']);
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}
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if (!empty($args['access_token'])) {
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$this->access_token = $args['access_token'];
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}
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if (!empty($args['access_token_secret'])) {
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$this->access_token_secret = $args['access_token_secret'];
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}
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$this->http = new curl(array('debug'=>false));
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$this->http_options = array();
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}
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/**
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* Build parameters list:
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* oauth_consumer_key="0685bd9184jfhq22",
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* oauth_nonce="4572616e48616d6d65724c61686176",
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* oauth_token="ad180jjd733klru7",
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* oauth_signature_method="HMAC-SHA1",
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* oauth_signature="wOJIO9A2W5mFwDgiDvZbTSMK%2FPY%3D",
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* oauth_timestamp="137131200",
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* oauth_version="1.0"
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* oauth_verifier="1.0"
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* @param array $param
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* @return string
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*/
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function get_signable_parameters($params){
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$sorted = $params;
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ksort($sorted);
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$total = array();
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foreach ($sorted as $k => $v) {
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if ($k == 'oauth_signature') {
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continue;
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}
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$total[] = rawurlencode($k) . '=' . rawurlencode($v);
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}
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return implode('&', $total);
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}
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/**
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* Create signature for oauth request
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* @param string $url
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* @param string $secret
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* @param array $params
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* @return string
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*/
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public function sign($http_method, $url, $params, $secret) {
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$sig = array(
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strtoupper($http_method),
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preg_replace('/%7E/', '~', rawurlencode($url)),
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rawurlencode($this->get_signable_parameters($params)),
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);
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$base_string = implode('&', $sig);
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$sig = base64_encode(hash_hmac('sha1', $base_string, $secret, true));
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return $sig;
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}
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/**
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* Initilize oauth request parameters, including:
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* oauth_consumer_key="0685bd9184jfhq22",
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* oauth_token="ad180jjd733klru7",
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* oauth_signature_method="HMAC-SHA1",
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* oauth_signature="wOJIO9A2W5mFwDgiDvZbTSMK%2FPY%3D",
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* oauth_timestamp="137131200",
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* oauth_nonce="4572616e48616d6d65724c61686176",
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* oauth_version="1.0"
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* To access protected resources, oauth_token should be defined
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*
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* @param string $url
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* @param string $token
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* @param string $http_method
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* @return array
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*/
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public function prepare_oauth_parameters($url, $params, $http_method = 'POST') {
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if (is_array($params)) {
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$oauth_params = $params;
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} else {
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$oauth_params = array();
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}
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$oauth_params['oauth_version'] = '1.0';
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$oauth_params['oauth_nonce'] = $this->get_nonce();
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$oauth_params['oauth_timestamp'] = $this->get_timestamp();
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$oauth_params['oauth_consumer_key'] = $this->consumer_key;
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$oauth_params['oauth_signature_method'] = 'HMAC-SHA1';
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$oauth_params['oauth_signature'] = $this->sign($http_method, $url, $oauth_params, $this->sign_secret);
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return $oauth_params;
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}
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public function setup_oauth_http_header($params) {
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$total = array();
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ksort($params);
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foreach ($params as $k => $v) {
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$total[] = rawurlencode($k) . '="' . rawurlencode($v).'"';
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}
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$str = implode(', ', $total);
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$str = 'Authorization: OAuth '.$str;
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$this->http->setHeader('Expect:');
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$this->http->setHeader($str);
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}
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/**
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* Sets the options for the next curl request
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*
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* @param array $options
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*/
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public function setup_oauth_http_options($options) {
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$this->http_options = $options;
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}
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/**
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* Request token for authentication
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* This is the first step to use OAuth, it will return oauth_token and oauth_token_secret
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* @return array
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*/
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public function request_token() {
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$this->sign_secret = $this->consumer_secret.'&';
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if (empty($this->oauth_callback)) {
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$params = [];
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} else {
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$params = ['oauth_callback' => $this->oauth_callback->out(false)];
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}
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$params = $this->prepare_oauth_parameters($this->request_token_api, $params, 'GET');
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$content = $this->http->get($this->request_token_api, $params, $this->http_options);
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// Including:
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// oauth_token
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// oauth_token_secret
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$result = $this->parse_result($content);
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if (empty($result['oauth_token'])) {
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throw new moodle_exception('oauth1requesttoken', 'core_error', '', null, $content);
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}
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// Build oauth authorize url.
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$result['authorize_url'] = $this->authorize_url . '?oauth_token='.$result['oauth_token'];
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return $result;
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}
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/**
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* Set oauth access token for oauth request
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* @param string $token
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* @param string $secret
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*/
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public function set_access_token($token, $secret) {
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$this->access_token = $token;
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$this->access_token_secret = $secret;
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}
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/**
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* Request oauth access token from server
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* @param string $method
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* @param string $url
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* @param string $token
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* @param string $secret
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*/
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public function get_access_token($token, $secret, $verifier='') {
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$this->sign_secret = $this->consumer_secret.'&'.$secret;
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$params = $this->prepare_oauth_parameters($this->access_token_api, array('oauth_token'=>$token, 'oauth_verifier'=>$verifier), 'POST');
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$this->setup_oauth_http_header($params);
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// Should never send the callback in this request.
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unset($params['oauth_callback']);
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$content = $this->http->post($this->access_token_api, $params, $this->http_options);
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$keys = $this->parse_result($content);
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if (empty($keys['oauth_token']) || empty($keys['oauth_token_secret'])) {
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throw new moodle_exception('oauth1accesstoken', 'core_error', '', null, $content);
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}
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$this->set_access_token($keys['oauth_token'], $keys['oauth_token_secret']);
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return $keys;
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}
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/**
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* Request oauth protected resources
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* @param string $method
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* @param string $url
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* @param string $token
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* @param string $secret
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*/
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public function request($method, $url, $params=array(), $token='', $secret='') {
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if (empty($token)) {
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$token = $this->access_token;
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}
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if (empty($secret)) {
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$secret = $this->access_token_secret;
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}
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// to access protected resource, sign_secret will alwasy be consumer_secret+token_secret
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$this->sign_secret = $this->consumer_secret.'&'.$secret;
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if (strtolower($method) === 'post' && !empty($params)) {
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$oauth_params = $this->prepare_oauth_parameters($url, array('oauth_token'=>$token) + $params, $method);
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} else {
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$oauth_params = $this->prepare_oauth_parameters($url, array('oauth_token'=>$token), $method);
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}
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$this->setup_oauth_http_header($oauth_params);
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$content = call_user_func_array(array($this->http, strtolower($method)), array($url, $params, $this->http_options));
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// reset http header and options to prepare for the next request
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$this->http->resetHeader();
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// return request return value
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return $content;
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}
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/**
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* shortcut to start http get request
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*/
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public function get($url, $params=array(), $token='', $secret='') {
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return $this->request('GET', $url, $params, $token, $secret);
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}
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/**
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* shortcut to start http post request
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*/
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public function post($url, $params=array(), $token='', $secret='') {
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return $this->request('POST', $url, $params, $token, $secret);
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}
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/**
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* A method to parse oauth response to get oauth_token and oauth_token_secret
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* @param string $str
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* @return array
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*/
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public function parse_result($str) {
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if (empty($str)) {
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throw new moodle_exception('error');
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}
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$parts = explode('&', $str);
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$result = array();
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foreach ($parts as $part){
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list($k, $v) = explode('=', $part, 2);
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$result[urldecode($k)] = urldecode($v);
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}
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if (empty($result)) {
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throw new moodle_exception('error');
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}
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return $result;
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}
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/**
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* Set nonce
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*/
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function set_nonce($str) {
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$this->nonce = $str;
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}
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/**
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* Set timestamp
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*/
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function set_timestamp($time) {
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$this->timestamp = $time;
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}
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/**
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* Generate timestamp
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*/
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function get_timestamp() {
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if (!empty($this->timestamp)) {
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$timestamp = $this->timestamp;
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unset($this->timestamp);
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return $timestamp;
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}
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return time();
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}
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/**
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* Generate nonce for oauth request
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*/
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function get_nonce() {
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if (!empty($this->nonce)) {
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$nonce = $this->nonce;
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unset($this->nonce);
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return $nonce;
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}
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$mt = microtime();
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$rand = mt_rand();
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return md5($mt . $rand);
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}
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}
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/**
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* OAuth 2.0 Client for using web access tokens.
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*
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* http://tools.ietf.org/html/draft-ietf-oauth-v2-22
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*
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* @package core
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* @copyright Dan Poltawski <talktodan@gmail.com>
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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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abstract class oauth2_client extends curl {
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/** @var string $clientid client identifier issued to the client */
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private $clientid = '';
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/** @var string $clientsecret The client secret. */
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private $clientsecret = '';
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/** @var moodle_url $returnurl URL to return to after authenticating */
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private $returnurl = null;
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/** @var string $scope of the authentication request */
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protected $scope = '';
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/** @var stdClass $accesstoken access token object */
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protected $accesstoken = null;
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/** @var string $refreshtoken refresh token string */
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protected $refreshtoken = '';
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/** @var string $mocknextresponse string */
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private $mocknextresponse = '';
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/** @var array $upgradedcodes list of upgraded codes in this request */
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private static $upgradedcodes = [];
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/** @var bool basicauth */
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protected $basicauth = false;
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/**
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* Returns the auth url for OAuth 2.0 request
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* @return string the auth url
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*/
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abstract protected function auth_url();
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/**
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* Returns the token url for OAuth 2.0 request
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* @return string the auth url
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*/
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abstract protected function token_url();
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/**
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* Constructor.
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*
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* @param string $clientid
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* @param string $clientsecret
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* @param moodle_url $returnurl
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* @param string $scope
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*/
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public function __construct($clientid, $clientsecret, moodle_url $returnurl, $scope) {
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parent::__construct();
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$this->clientid = $clientid;
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$this->clientsecret = $clientsecret;
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$this->returnurl = $returnurl;
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$this->scope = $scope;
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$this->accesstoken = $this->get_stored_token();
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}
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/**
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* Is the user logged in? Note that if this is called
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* after the first part of the authorisation flow the token
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* is upgraded to an accesstoken.
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*
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* @return boolean true if logged in
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*/
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public function is_logged_in() {
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// Has the token expired?
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if (isset($this->accesstoken->expires) && time() >= $this->accesstoken->expires) {
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$this->log_out();
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return false;
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}
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// We have a token so we are logged in.
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if (isset($this->accesstoken->token)) {
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// Check that the access token has all the requested scopes.
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$scopemissing = false;
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$scopecheck = ' ' . $this->accesstoken->scope . ' ';
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$requiredscopes = explode(' ', $this->scope);
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foreach ($requiredscopes as $requiredscope) {
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if (strpos($scopecheck, ' ' . $requiredscope . ' ') === false) {
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$scopemissing = true;
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break;
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}
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}
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if (!$scopemissing) {
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return true;
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}
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}
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// If we've been passed then authorization code generated by the
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// authorization server try and upgrade the token to an access token.
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$code = optional_param('oauth2code', null, PARAM_RAW);
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// Note - sometimes we may call is_logged_in twice in the same request - we don't want to attempt
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// to upgrade the same token twice.
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if ($code && !in_array($code, self::$upgradedcodes) && $this->upgrade_token($code)) {
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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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* Callback url where the request is returned to.
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*
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* @return moodle_url url of callback
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*/
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public static function callback_url() {
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global $CFG;
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return new moodle_url('/admin/oauth2callback.php');
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}
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/**
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* An additional array of url params to pass with a login request.
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*
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* @return array of name value pairs.
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*/
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public function get_additional_login_parameters() {
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return [];
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}
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/**
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* Returns the login link for this oauth request
|
|
*
|
|
* @return moodle_url login url
|
|
*/
|
|
public function get_login_url() {
|
|
|
|
$callbackurl = self::callback_url();
|
|
$params = array_merge(
|
|
[
|
|
'client_id' => $this->clientid,
|
|
'response_type' => 'code',
|
|
'redirect_uri' => $callbackurl->out(false),
|
|
'state' => $this->returnurl->out_as_local_url(false),
|
|
'scope' => $this->scope,
|
|
],
|
|
$this->get_additional_login_parameters()
|
|
);
|
|
|
|
return new moodle_url($this->auth_url(), $params);
|
|
}
|
|
|
|
/**
|
|
* Given an array of name value pairs - build a valid HTTP POST application/x-www-form-urlencoded string.
|
|
*
|
|
* @param array $params Name / value pairs.
|
|
* @return string POST data.
|
|
*/
|
|
public function build_post_data($params) {
|
|
$result = [];
|
|
foreach ($params as $name => $value) {
|
|
$result[] = urlencode($name) . '=' . urlencode($value);
|
|
}
|
|
return implode('&', $result);
|
|
}
|
|
|
|
/**
|
|
* Upgrade a authorization token from oauth 2.0 to an access token
|
|
*
|
|
* @param string $code the code returned from the oauth authenticaiton
|
|
* @return boolean true if token is upgraded succesfully
|
|
*/
|
|
public function upgrade_token($code) {
|
|
$callbackurl = self::callback_url();
|
|
$params = array('code' => $code,
|
|
'grant_type' => 'authorization_code',
|
|
'redirect_uri' => $callbackurl->out(false),
|
|
);
|
|
|
|
if ($this->basicauth) {
|
|
$idsecret = urlencode($this->clientid) . ':' . urlencode($this->clientsecret);
|
|
$this->setHeader('Authorization: Basic ' . base64_encode($idsecret));
|
|
} else {
|
|
$params['client_id'] = $this->clientid;
|
|
$params['client_secret'] = $this->clientsecret;
|
|
}
|
|
|
|
// Requests can either use http GET or POST.
|
|
if ($this->use_http_get()) {
|
|
$response = $this->get($this->token_url(), $params);
|
|
} else {
|
|
$response = $this->post($this->token_url(), $this->build_post_data($params));
|
|
}
|
|
|
|
if ($this->info['http_code'] !== 200) {
|
|
throw new moodle_exception('Could not upgrade oauth token');
|
|
}
|
|
|
|
$r = json_decode($response);
|
|
|
|
if (is_null($r)) {
|
|
throw new moodle_exception("Could not decode JSON token response");
|
|
}
|
|
|
|
if (!empty($r->error)) {
|
|
throw new moodle_exception($r->error . ' ' . $r->error_description);
|
|
}
|
|
|
|
if (!isset($r->access_token)) {
|
|
return false;
|
|
}
|
|
|
|
if (isset($r->refresh_token)) {
|
|
$this->refreshtoken = $r->refresh_token;
|
|
}
|
|
|
|
// Store the token an expiry time.
|
|
$accesstoken = new stdClass;
|
|
$accesstoken->token = $r->access_token;
|
|
if (isset($r->expires_in)) {
|
|
// Expires 10 seconds before actual expiry.
|
|
$accesstoken->expires = (time() + ($r->expires_in - 10));
|
|
}
|
|
$accesstoken->scope = $this->scope;
|
|
// Also add the scopes.
|
|
self::$upgradedcodes[] = $code;
|
|
$this->store_token($accesstoken);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Logs out of a oauth request, clearing any stored tokens
|
|
*/
|
|
public function log_out() {
|
|
$this->store_token(null);
|
|
}
|
|
|
|
/**
|
|
* Make a HTTP request, adding the access token we have
|
|
*
|
|
* @param string $url The URL to request
|
|
* @param array $options
|
|
* @param mixed $acceptheader mimetype (as string) or false to skip sending an accept header.
|
|
* @return bool
|
|
*/
|
|
protected function request($url, $options = array(), $acceptheader = 'application/json') {
|
|
$murl = new moodle_url($url);
|
|
|
|
if ($this->accesstoken) {
|
|
if ($this->use_http_get()) {
|
|
// If using HTTP GET add as a parameter.
|
|
$murl->param('access_token', $this->accesstoken->token);
|
|
} else {
|
|
$this->setHeader('Authorization: Bearer '.$this->accesstoken->token);
|
|
}
|
|
}
|
|
|
|
if ($acceptheader) {
|
|
$this->setHeader('Accept: ' . $acceptheader);
|
|
}
|
|
|
|
$response = parent::request($murl->out(false), $options);
|
|
|
|
$this->resetHeader();
|
|
|
|
return $response;
|
|
}
|
|
|
|
/**
|
|
* Multiple HTTP Requests
|
|
* This function could run multi-requests in parallel.
|
|
*
|
|
* @param array $requests An array of files to request
|
|
* @param array $options An array of options to set
|
|
* @return array An array of results
|
|
*/
|
|
protected function multi($requests, $options = array()) {
|
|
if ($this->accesstoken) {
|
|
$this->setHeader('Authorization: Bearer '.$this->accesstoken->token);
|
|
}
|
|
return parent::multi($requests, $options);
|
|
}
|
|
|
|
/**
|
|
* Returns the tokenname for the access_token to be stored
|
|
* through multiple requests.
|
|
*
|
|
* The default implentation is to use the classname combiend
|
|
* with the scope.
|
|
*
|
|
* @return string tokenname for prefernce storage
|
|
*/
|
|
protected function get_tokenname() {
|
|
// This is unusual but should work for most purposes.
|
|
return get_class($this).'-'.md5($this->scope);
|
|
}
|
|
|
|
/**
|
|
* Store a token between requests. Currently uses
|
|
* session named by get_tokenname
|
|
*
|
|
* @param stdClass|null $token token object to store or null to clear
|
|
*/
|
|
protected function store_token($token) {
|
|
global $SESSION;
|
|
|
|
$this->accesstoken = $token;
|
|
$name = $this->get_tokenname();
|
|
|
|
if ($token !== null) {
|
|
$SESSION->{$name} = $token;
|
|
} else {
|
|
unset($SESSION->{$name});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get a refresh token!!!
|
|
*
|
|
* @return string
|
|
*/
|
|
public function get_refresh_token() {
|
|
return $this->refreshtoken;
|
|
}
|
|
|
|
/**
|
|
* Retrieve a token stored.
|
|
*
|
|
* @return stdClass|null token object
|
|
*/
|
|
protected function get_stored_token() {
|
|
global $SESSION;
|
|
|
|
$name = $this->get_tokenname();
|
|
|
|
if (isset($SESSION->{$name})) {
|
|
return $SESSION->{$name};
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Get access token.
|
|
*
|
|
* This is just a getter to read the private property.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function get_accesstoken() {
|
|
return $this->accesstoken;
|
|
}
|
|
|
|
/**
|
|
* Get the client ID.
|
|
*
|
|
* This is just a getter to read the private property.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function get_clientid() {
|
|
return $this->clientid;
|
|
}
|
|
|
|
/**
|
|
* Get the client secret.
|
|
*
|
|
* This is just a getter to read the private property.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function get_clientsecret() {
|
|
return $this->clientsecret;
|
|
}
|
|
|
|
/**
|
|
* Should HTTP GET be used instead of POST?
|
|
* Some APIs do not support POST and want oauth to use
|
|
* GET instead (with the auth_token passed as a GET param).
|
|
*
|
|
* @return bool true if GET should be used
|
|
*/
|
|
protected function use_http_get() {
|
|
return false;
|
|
}
|
|
}
|
|
|