3 * IndieAuth to OpenID proxy.
4 * Proxies IndieAuth authorization requests to one's OpenID server
8 * @package indieauth-openid
9 * @author Christian Weiske <cweiske@cweiske.de>
10 * @license http://www.gnu.org/licenses/agpl.html GNU AGPL v3
11 * @link http://indiewebcamp.com/login-brainstorming
12 * @link http://indiewebcamp.com/authorization-endpoint
13 * @link http://indiewebcamp.com/auth-brainstorming
14 * @link https://indieauth.com/developers
17 require_once 'Net/URL2.php';
18 require_once 'OpenID/RelyingParty.php';
19 require_once 'OpenID/Message.php';
20 require_once 'OpenID/Exception.php';
24 $db = new PDO('sqlite:' . __DIR__ . '/../data/tokens.sq3');
25 $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
26 $db->exec("CREATE TABLE IF NOT EXISTS authtokens(
35 $stmt = $db->prepare('DELETE FROM authtokens WHERE created < :created');
36 $stmt->execute(array(':created' => date('c', time() - 60)));
41 function create_token($me, $redirect_uri, $client_id, $state)
43 $code = base64_encode(openssl_random_pseudo_bytes(32));
46 'INSERT INTO authtokens (code, me, redirect_uri, client_id, state, created)'
47 . ' VALUES(:code, :me, :redirect_uri, :client_id, :state, :created)'
52 ':redirect_uri' => $redirect_uri,
53 ':client_id' => $client_id,
54 ':state' => (string) $state,
55 ':created' => date('c')
61 function validate_token($code, $redirect_uri, $client_id, $state)
65 'SELECT me FROM authtokens WHERE'
67 . ' AND redirect_uri = :redirect_uri'
68 . ' AND client_id = :client_id'
69 . ' AND state = :state'
70 . ' AND created >= :created'
75 ':redirect_uri' => $redirect_uri,
76 ':client_id' => $client_id,
77 ':state' => (string) $state,
78 ':created' => date('c', time() - 60)
81 $row = $stmt->fetch(PDO::FETCH_ASSOC);
83 $stmt = $db->prepare('DELETE FROM authtokens WHERE code = :code');
84 $stmt->execute(array(':code' => $code));
94 header('HTTP/1.0 400 Bad Request');
95 header('Content-type: text/plain; charset=utf-8');
100 function verifyUrlParameter($givenParams, $paramName)
102 if (!isset($givenParams[$paramName])) {
103 error('"' . $paramName . '" parameter missing');
105 $url = parse_url($givenParams[$paramName]);
106 if (!isset($url['scheme'])) {
107 error('Invalid URL in "' . $paramName . '" parameter: scheme missing');
109 if (!isset($url['host'])) {
110 error('Invalid URL in "' . $paramName . '" parameter: host missing');
113 return $givenParams[$paramName];
116 function getBaseUrl()
118 if (!isset($_SERVER['REQUEST_SCHEME'])) {
119 $_SERVER['REQUEST_SCHEME'] = 'http';
121 $file = preg_replace('/[?#].*$/', '', $_SERVER['REQUEST_URI']);
122 return $_SERVER['REQUEST_SCHEME'] . '://'
123 . $_SERVER['HTTP_HOST']
128 $returnTo = getBaseUrl();
129 $realm = getBaseUrl();
131 if (isset($_GET['openid_mode']) && $_GET['openid_mode'] != '') {
132 //verify openid response
133 if (!count($_POST)) {
134 list(, $queryString) = explode('?', $_SERVER['REQUEST_URI']);
136 $queryString = file_get_contents('php://input');
139 $message = new \OpenID_Message($queryString, \OpenID_Message::FORMAT_HTTP);
140 $id = $message->get('openid.claimed_id');
141 if ($id != $_SESSION['me']) {
144 'Given identity URL "%s" and claimed OpenID "%s" do not match',
150 $o = new \OpenID_RelyingParty($returnTo, $realm, $_SESSION['me']);
151 $result = $o->verify(new \Net_URL2($returnTo . '?' . $queryString), $message);
153 if ($result->success()) {
154 $token = create_token(
155 $_SESSION['me'], $_SESSION['redirect_uri'],
156 $_SESSION['client_id'], $_SESSION['state']
158 //redirect to indieauth
159 $url = new Net_URL2($_SESSION['redirect_uri']);
160 $url->setQueryVariable('code', $token);
161 $url->setQueryVariable('me', $_SESSION['me']);
162 $url->setQueryVariable('state', $_SESSION['state']);
163 header('Location: ' . $url->getURL());
166 error('Error verifying OpenID login: ' . $result->getAssertionMethod());
168 } catch (OpenID_Exception $e) {
169 error('Error verifying OpenID login: ' . $e->getMessage());
173 if ($_SERVER['REQUEST_METHOD'] == 'GET') {
174 $me = verifyUrlParameter($_GET, 'me');
175 $redirect_uri = verifyUrlParameter($_GET, 'redirect_uri');
176 $client_id = verifyUrlParameter($_GET, 'client_id');
178 if (isset($_GET['state'])) {
179 $state = $_GET['state'];
181 $response_type = 'id';
182 if (isset($_GET['response_type'])) {
183 $response_type = $_GET['response_type'];
185 if ($response_type != 'id') {
186 error('unsupported response_type: ' . $response_type);
189 $_SESSION['me'] = $me;
190 $_SESSION['redirect_uri'] = $redirect_uri;
191 $_SESSION['client_id'] = $client_id;
192 $_SESSION['state'] = $state;
195 $o = new \OpenID_RelyingParty($returnTo, $realm, $me);
196 $authRequest = $o->prepare();
197 $url = $authRequest->getAuthorizeURL();
198 header("Location: $url");
200 } catch (OpenID_Exception $e) {
201 error('OpenID error: ' . $e->getMessage());
203 } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
204 $redirect_uri = verifyUrlParameter($_POST, 'redirect_uri');
205 $client_id = verifyUrlParameter($_POST, 'client_id');
207 if (isset($_GET['state'])) {
208 $state = $_GET['state'];
210 if (!isset($_POST['code'])) {
211 error('"code" parameter missing');
213 $token = $_POST['code'];
215 $me = validate_token($token, $redirect_uri, $client_id, $state);
217 header('HTTP/1.0 400 Bad Request');
218 echo "Validating token failed\n";
221 header('Content-type: application/x-www-form-urlencoded');
222 echo 'me=' . urlencode($me);