/
provider.php
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provider.php
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<?php
/**
* Plugin Name: WP OAuth Provider
* Description: Enable WordPress to act as an OAuth provider!
*
* A massive thanks to Morten Fangel, as without his guide, this would
* have taken a lot longer to write.
*/
if (!class_exists('OAuthServer')) {
require_once(dirname(__FILE__) . '/oauth.php');
}
class WPOAuthProvider {
protected static $data;
protected static $server;
const PATH_AUTHORIZE = '/oauth/authorize/';
public static function bootstrap() {
self::$data = new WPOAuthProvider_DataStore();
self::$server = new OAuthServer(self::$data);
$hmac = new OAuthSignatureMethod_HMAC_SHA1();
self::$server->add_signature_method($hmac);
// only allow plaintext if we're over a secure connection
if (is_ssl()) {
$plaintext = new OAuthSignatureMethod_PLAINTEXT();
self::$oauth->add_signature_method($plaintext);
}
register_activation_hook(__FILE__, array(get_class(), 'activate'));
register_deactivation_hook(__FILE__, array(get_class(), 'deactivate'));
add_filter('authenticate', array(get_class(), 'authenticate'), 15, 3);
add_filter('plugins_loaded', array(get_class(), 'plugins_loaded'));
add_filter('rewrite_rules_array', array(get_class(), 'rewrite_rules_array'));
add_filter('query_vars', array(get_class(), 'query_vars'));
add_filter('redirect_canonical', array(get_class(), 'redirect_canonical'), 10, 2);
add_action('template_redirect', array(get_class(), 'template_redirect'));
}
public static function activate() {
global $wp_rewrite;
$wp_rewrite->flush_rules();
}
public static function deactivate() {
global $wp_rewrite;
remove_filter('rewrite_rules_array', array(get_class(), 'rewrite_rules_array'));
$wp_rewrite->flush_rules();
}
public static function rewrite_rules_array($rules) {
$newrules = array();
$newrules['oauth/authorize$'] = 'index.php?oauth=authorize';
return array_merge($newrules, $rules);
}
public static function query_vars($vars) {
$vars[] = 'oauth';
return $vars;
}
public static function redirect_canonical($new, $old) {
if (strlen(get_query_var('oauth')) > 0) {
return false;
}
return $new;
}
public static function template_redirect() {
$page = get_query_var('oauth');
if (!$page) {
return;
}
switch ($page) {
case 'authorize':
self::authorize();
break;
default:
global $wp_query;
$wp_query->set_404();
return;
}
die();
}
public static function get_consumer($key) {
return self::$data->lookup_consumer($key);
}
public static function create_consumer() {
return self::$data->new_consumer();
}
public static function delete_consumer($key) {
return self::$data->delete_consumer($key);
}
public static function request_token($request) {
$token = self::$server->fetch_request_token($request);
$data = array(
'oauth_token' => OAuthUtil::urlencode_rfc3986($token->key),
'oauth_token_secret' => OAuthUtil::urlencode_rfc3986($token->secret)
);
$token->callback = $request->get_parameter('oauth_callback');
if (!empty($token->callback)) {
$data['oauth_callback_confirmed'] = 'true';
$token->save();
}
return $data;
}
public static function authorize() {
if (empty($_REQUEST['oauth_token'])) {
wp_die('No OAuth token found in request. Please ensure your client is configured correctly.', 'OAuth Error', array('response' => 400));
}
$request = OAuthRequest::from_request();
$url = site_url('/oauth/authorize');
$url = add_query_arg('oauth_token', $request->get_parameter('oauth_token'), $url);
if (!is_user_logged_in()) {
wp_redirect(wp_login_url($url));
die();
}
$token = get_transient('wpoa_' . $request->get_parameter('oauth_token'));
$consumer = self::$data->lookup_consumer($token->consumer);
if (empty($_POST['wpoauth_nonce']) || empty($_POST['wpoauth_button'])) {
return self::authorize_page($consumer, $request->get_parameter('oauth_token'));
}
if (!wp_verify_nonce($_POST['wpoauth_nonce'], 'wpoauth')) {
status_header(400);
wp_die('Invalid request.');
}
$current_user = wp_get_current_user();
switch (strtolower($_POST['wpoauth_button'])) {
case 'yes':
$token->user = $current_user->ID;
$token->verifier = wp_generate_password(8, false);
$token->authorize();
$data = array(
'oauth_token' => $request->get_parameter('oauth_token'),
'oauth_verifier' => $token->verifier
);
break;
case 'no':
$token->delete();
$data = array(
'denied' => true
);
break;
default:
// wtf?
status_header(500);
wp_die('Weird');
break;
}
if (empty($token->callback) && $request->get_parameter('oauth_callback')) {
$token->callback = $request->get_parameter('oauth_callback');
$token->save();
}
if (!empty($token->callback) && $token->callback !== 'oob') {
$callback = add_query_arg($data, $token->callback);
wp_redirect($callback);
die();
}
header('Content-Type: text/plain');
echo http_build_query($data, null, '&');
die();
}
protected static function authorize_page($consumer, $token) {
?>
<form action="<?php echo site_url('/oauth/authorize') ?>" method="POST">
<p>Authorize?</p>
<?php wp_nonce_field('wpoauth', 'wpoauth_nonce') ?>
<input type="hidden" name="oauth_token" value="<?php echo esc_attr($token) ?>" />
<input type="submit" name="wpoauth_button" value="Yes" />
<input type="submit" name="wpoauth_button" value="No" />
</form>
<?php
}
public static function access_token($request) {
$token = self::$server->fetch_access_token($request);
header('Content-Type: application/x-www-form-urlencoded');
return sprintf(
'oauth_token=%s&oauth_token_secret=%s',
OAuthUtil::urlencode_rfc3986($token->key),
OAuthUtil::urlencode_rfc3986($token->secret)
);
}
public static function authenticate($user, $username, $password) {
if (is_a($user, 'WP_User')) {
return $user;
}
try {
$request = OAuthRequest::from_request();
list($consumer, $token) = self::$server->verify_request($request);
$user = new WP_User($token->user);
}
catch (OAuthException $e) {
// header('WWW-Authenticate: OAuth realm="' . site_url() . '"');
}
return $user;
}
public static function plugins_loaded() {
try {
$request = OAuthRequest::from_request();
list($consumer, $token) = self::$server->verify_request($request);
global $current_user;
$current_user = new WP_User($token->user);
}
catch (OAuthException $e) {
// header('WWW-Authenticate: OAuth realm="' . site_url() . '"');
}
}
}
class WPOAuthProvider_DataStore {
const RETAIN_TIME = 3600; // retain nonces for 1 hour
/**
* @param string $consumer_key
* @return object Has properties "key" and "secret"
*/
public function lookup_consumer($consumer_key) {
$secret = get_option('wpoa_c_' . $consumer_key, false);
if (!$secret) {
return null;
}
$consumer = new OAuthConsumer($consumer_key, $secret);
return $consumer;
}
/**
* @return string Consumer key
*/
public function new_consumer() {
$key = wp_generate_password(12, false);
$secret = self::generate_secret();
$result = update_option('wpoa_c_' . $key, $secret);
if (!$result) {
return false;
}
return $key;
}
/**
* @param string $consumer_key
* @return boolean
*/
public function delete_consumer($consumer_key) {
return delete_option('wpoa_c_' . $consumer_key, false);
}
/**
* @param OAuthConsumer $consumer
* @return WPOAuthProvider_Token_Request|null
*/
public function new_request_token($consumer) {
$key = self::generate_key('rt');
$secret = self::generate_secret();
$token = new WPOAuthProvider_Token_Request($key, $secret);
$token->consumer = $consumer->key;
$token->authorized = false;
if (!$token->save()) {
return null;
}
return $token;
}
/**
* @param WPOAuth_Provider_Token_Request
* @param OAuthConsumer $consumer
* @param string $verifier
* @return WPOAuthProvider_Token_Access|null
*/
public function new_access_token($token, $consumer, $verifier) {
if (!$token->authorized) {
throw new OAuthException('Unauthorized access token');
}
if ($token->verifier !== $verifier) {
throw new OAuthException('Verifier does not match');
}
$key = self::generate_key('at');
$secret = self::generate_secret();
$access = new WPOAuthProvider_Token_Access($key, $secret);
$access->consumer = $consumer->key;
$access->user = $token->user;
$access->save();
$token->delete();
return $access;
}
/**
* @param OAuthConsumer $consumer
* @param string $token_type Either 'request' or 'access'
* @return WPOAuthProvider_Token|null
*/
public function lookup_token($consumer, $token_type, $token) {
switch ($token_type) {
case 'access':
$token = get_option('wpoa_' . $token);
break;
case 'request':
$token = get_transient('wpoa_' . $token);
break;
default:
throw new OAuthException('Invalid token type');
break;
}
if ($token->consumer !== $consumer->key) {
return null;
}
return $token;
}
/**
* @param OAuthConsumer $consumer
* @param WPOAuthProvider_Token $token
* @param string $nonce
* @param int $timestamp
* @return bool
*/
public function lookup_nonce($consumer, $token, $nonce, $timestamp) {
if ($timestamp < (time() - self::RETAIN_TIME)) {
return true;
}
$real = sha1($nonce . $consumer->id . $token->key . $timestamp);
$existing = get_transient('wpoa_n_' . $real);
if ($existing !== false) {
return true;
}
set_transient('wpoa_n_' . $real, true);
return false;
}
/**
* Generate an OAuth key
*
* The max key length is 43 characters, we use 24 to play it safe.
* @param string $type Either 'at' or 'rt' (access/request resp.)
* @return string
*/
protected function generate_key($type = 'at') {
//
return $type . '_' . wp_generate_password(24, false);
}
/**
* Generate an OAuth secret
*
* @return string
*/
protected function generate_secret() {
return wp_generate_password(48, false);
}
}
/**
* WordPress OAuth token class
*/
abstract class WPOAuthProvider_Token extends OAuthToken {
/*
public $key;
public $secret;
*/
public $consumer;
/**
* Save token
*
* @return bool
*/
abstract public function save();
/**
* Remove token
*
* @return bool
*/
abstract public function delete();
}
/**
* WordPress OAuth request token class
*/
class WPOAuthProvider_Token_Request extends WPOAuthProvider_Token {
/*
public $key;
public $secret;
public $consumer;
*/
public $authorized = false;
public $callback;
public $verifier;
/**
* How long should we keep request tokens?
*/
const RETAIN_TIME = 86400; // keep for 24 hours
/**
* Authorize a token
*/
public function authorize() {
$this->authorized = true;
$this->save();
}
/**
* Save token
*
* @return bool
*/
public function save() {
return set_transient('wpoa_' . $this->key, $this, self::RETAIN_TIME);
}
/**
* Remove token
*
* @return bool
*/
public function delete() {
return delete_transient('wpoa_' . $this->key);
}
}
/**
* WordPress OAuth access token class
*/
class WPOAuthProvider_Token_Access extends WPOAuthProvider_Token {
/*
public $key;
public $secret;
public $consumer;
*/
public $user;
/**
* Save token
*
* @return bool
*/
public function save() {
return update_option('wpoa_' . $this->key, $this);
}
/**
* Remove token
*
* @return bool
*/
public function delete() {
return delete_option('wpoa_' . $this->key);
}
}
WPOAuthProvider::bootstrap();