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<?php
function buildRedirectURI() {
return Config::$base_url . 'auth/callback';
}
function clientID() {
return Config::$base_url;
}
function build_url($parsed_url) {
$scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
$host = isset($parsed_url['host']) ? $parsed_url['host'] : '';
$port = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
$user = isset($parsed_url['user']) ? $parsed_url['user'] : '';
$pass = isset($parsed_url['pass']) ? ':' . $parsed_url['pass'] : '';
$pass = ($user || $pass) ? "$pass@" : '';
$path = isset($parsed_url['path']) ? $parsed_url['path'] : '';
$query = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
$fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
return "$scheme$user$pass$host$port$path$query$fragment";
}
function hostname($url) {
return parse_url($url, PHP_URL_HOST);
}
function add_hcard_info($user, $hCard) {
if($user && $hCard) {
// Update the user's h-card info if present
if(BarnabyWalters\Mf2\hasProp($hCard, 'name'))
$user->name = BarnabyWalters\Mf2\getPlaintext($hCard, 'name');
if(BarnabyWalters\Mf2\hasProp($hCard, 'photo'))
$user->photo_url = BarnabyWalters\Mf2\getPlaintext($hCard, 'photo');
}
}
$app->get('/', function($format='html') use($app) {
$res = $app->response();
render('index', array(
'title' => 'Teacup',
'meta' => ''
));
});
$app->get('/auth/start', function() use($app) {
$req = $app->request();
$params = $req->params();
// the "me" parameter is user input, and may be in a couple of different forms:
// aaronparecki.com http://aaronparecki.com http://aaronparecki.com/
// Normlize the value now (move this into a function in IndieAuth\Client later)
if(!array_key_exists('me', $params) || !($me = IndieAuth\Client::normalizeMeURL($params['me']))) {
render('auth_error', array(
'title' => 'Sign In',
'error' => 'Invalid "me" Parameter',
'errorDescription' => 'The URL you entered, "<strong>' . $params['me'] . '</strong>" is not valid.'
));
return;
}
$_SESSION['attempted_me'] = $me;
$authorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($me);
$tokenEndpoint = IndieAuth\Client::discoverTokenEndpoint($me);
$micropubEndpoint = IndieAuth\Client::discoverMicropubEndpoint($me);
$hCard = IndieAuth\Client::representativeHCard($me);
// Generate a "state" parameter for the request
$state = IndieAuth\Client::generateStateParameter();
$_SESSION['auth_state'] = $state;
$_SESSION['redirect_after_login'] = '/new';
if($tokenEndpoint && $micropubEndpoint && $authorizationEndpoint) {
$scope = 'create media';
$authorizationURL = IndieAuth\Client::buildAuthorizationURL($authorizationEndpoint, [
'me' => $me,
'redirect_uri' => buildRedirectURI(),
'client_id' => clientID(),
'state' => $state,
'scope' => $scope
]);
$_SESSION['authorization_endpoint'] = $authorizationEndpoint;
$_SESSION['micropub_endpoint'] = $micropubEndpoint;
$_SESSION['token_endpoint'] = $tokenEndpoint;
} else {
$authorizationURL = IndieAuth\Client::buildAuthorizationURL('https://indielogin.com/auth', [
'me' => $me,
'redirect_uri' => buildRedirectURI(),
'client_id' => clientID(),
'state' => $state
]);
}
// If the user has already signed in before and has a micropub access token, skip
// the debugging screens and redirect immediately to the auth endpoint.
// This will still generate a new access token when they finish logging in.
$user = ORM::for_table('users')->where('url', hostname($me))->find_one();
if($user && $user->access_token && !array_key_exists('restart', $params)) {
add_hcard_info($user, $hCard);
$user->micropub_endpoint = $micropubEndpoint;
$user->authorization_endpoint = $authorizationEndpoint;
$user->token_endpoint = $tokenEndpoint;
$user->type = $micropubEndpoint ? 'micropub' : 'local';
$user->save();
$app->redirect($authorizationURL, 301);
} else {
if(!$user)
$user = ORM::for_table('users')->create();
add_hcard_info($user, $hCard);
$user->url = hostname($me);
$user->date_created = date('Y-m-d H:i:s');
$user->micropub_endpoint = $micropubEndpoint;
$user->authorization_endpoint = $authorizationEndpoint;
$user->token_endpoint = $tokenEndpoint;
$user->type = $micropubEndpoint ? 'micropub' : 'local';
$user->save();
render('auth_start', array(
'title' => 'Sign In',
'me' => $me,
'authorizing' => $me,
'meParts' => parse_url($me),
'micropubUser' => $authorizationEndpoint && $tokenEndpoint && $micropubEndpoint,
'tokenEndpoint' => $tokenEndpoint,
'micropubEndpoint' => $micropubEndpoint,
'authorizationEndpoint' => $authorizationEndpoint,
'authorizationURL' => $authorizationURL
));
}
});
$app->get('/auth/callback', function() use($app) {
$req = $app->request();
$params = $req->params();
// If there is no state in the session, start the login again
if(!array_key_exists('auth_state', $_SESSION)) {
render('auth_error', array(
'title' => 'Auth Callback',
'error' => 'Missing session state',
'errorDescription' => 'Something went wrong, please try signing in again, and make sure cookies are enabled for this domain.'
));
return;
}
if(!array_key_exists('code', $params) || trim($params['code']) == '') {
render('auth_error', array(
'title' => 'Auth Callback',
'error' => 'Missing authorization code',
'errorDescription' => 'No authorization code was provided in the request.'
));
return;
}
// Verify the state came back and matches what we set in the session
// Should only fail for malicious attempts, ok to show a not as nice error message
if(!array_key_exists('state', $params)) {
render('auth_error', array(
'title' => 'Auth Callback',
'error' => 'Missing state parameter',
'errorDescription' => 'No state parameter was provided in the request. This shouldn\'t happen. It is possible this is a malicious authorization attempt, or your authorization server failed to pass back the "state" parameter.'
));
return;
}
if($params['state'] != $_SESSION['auth_state']) {
render('auth_error', array(
'title' => 'Auth Callback',
'error' => 'Invalid state',
'errorDescription' => 'The state parameter provided did not match the state provided at the start of authorization. This is most likely caused by a malicious authorization attempt.'
));
return;
}
if(!isset($_SESSION['attempted_me'])) {
render('auth_error', [
'title' => 'Auth Callback',
'error' => 'Missing data',
'errorDescription' => 'We forgot who was logging in. It\'s possible you took too long to finish signing in, or something got mixed up by signing in in another tab.'
]);
return;
}
$me = $_SESSION['attempted_me'];
// Now the basic checks have passed. Time to start providing more helpful messages when there is an error.
// An authorization code is in the query string, and we want to exchange that for an access token at the token endpoint.
$authorizationEndpoint = isset($_SESSION['authorization_endpoint']) ? $_SESSION['authorization_endpoint'] : false;
$tokenEndpoint = isset($_SESSION['token_endpoint']) ? $_SESSION['token_endpoint'] : false;
$micropubEndpoint = isset($_SESSION['micropub_endpoint']) ? $_SESSION['micropub_endpoint'] : false;
unset($_SESSION['authorization_endpoint']);
unset($_SESSION['token_endpoint']);
unset($_SESSION['micropub_endpoint']);
$skipDebugScreen = false;
if($tokenEndpoint) {
// Exchange auth code for an access token
$token = IndieAuth\Client::exchangeAuthorizationCode($tokenEndpoint, [
'code' => $params['code'],
'redirect_uri' => buildRedirectURI(),
'client_id' => clientID()
]);
// If a valid access token was returned, store the token info in the session and they are signed in
if(k($token['response'], array('me','access_token','scope'))) {
// Verify the authorization endpoint matches
if($token['response']['me'] != $me) {
$newAuthorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($token['response']['me']);
if($newAuthorizationEndpoint != $authorizationEndpoint) {
render('auth_error', [
'title' => 'Error Signing In',
'error' => 'Invalid authorization endpoint',
'errorDescription' => 'The authorization endpoint for the returned profile URL did not match the authorization endpoint used to begin the login.'
]);
return;
}
}
$_SESSION['auth'] = $token['response'];
$_SESSION['me'] = $me = $token['response']['me'];
}
} else {
// No token endpoint was discovered, instead, verify the auth code at the auth server or with indieauth.com
// Never show the intermediate login confirmation page if we just authenticated them instead of got authorization
$skipDebugScreen = true;
if(!$authorizationEndpoint) {
$authorizationEndpoint = 'https://indielogin.com/auth';
}
$token = IndieAuth\Client::exchangeAuthorizationCode($authorizationEndpoint, [
'code' => $params['code'],
'redirect_uri' => buildRedirectURI(),
'client_id' => clientID()
]);
if(k($token['response'], 'me')) {
$_SESSION['auth'] = $token['response'];
$_SESSION['me'] = $me = $token['response']['me'];
}
}
// Verify the login actually succeeded
if(!k($token['response'], 'me')) {
render('auth_error', array(
'title' => 'Sign-In Failed',
'error' => 'Unable to verify the sign-in attempt',
'errorDescription' => ''
));
return;
}
$user = ORM::for_table('users')->where('url', hostname($me))->find_one();
if($user) {
// Already logged in, update the last login date
$user->last_login = date('Y-m-d H:i:s');
// If they have logged in before and we already have an access token, then redirect to the dashboard now
if($user->access_token)
$skipDebugScreen = true;
} else {
// New user! Store the user in the database
$user = ORM::for_table('users')->create();
$user->url = hostname($me);
$user->date_created = date('Y-m-d H:i:s');
$user->last_login = date('Y-m-d H:i:s');
}
$user->micropub_endpoint = $micropubEndpoint;
$user->access_token = $token['response']['access_token'];
$user->token_scope = $token['response']['scope'];
$user->token_response = $token['raw_response'];
$user->save();
$_SESSION['user_id'] = $user->id();
if($tokenEndpoint) {
// Make a request to the micropub endpoint to discover the media endpoint if set.
get_micropub_config($user);
}
unset($_SESSION['auth_state']);
if($skipDebugScreen) {
$app->redirect($_SESSION['redirect_after_login'], 301);
} else {
render('auth_callback', array(
'title' => 'Sign In',
'me' => $me,
'authorizing' => $me,
'meParts' => parse_url($me),
'tokenEndpoint' => $tokenEndpoint,
'auth' => $token['auth'],
'response' => $token['response'],
'curl_error' => (array_key_exists('error', $token) ? $token['error'] : false),
'redirect' => $_SESSION['redirect_after_login']
));
}
});
$app->get('/signout', function() use($app) {
unset($_SESSION['auth']);
unset($_SESSION['me']);
unset($_SESSION['auth_state']);
unset($_SESSION['user_id']);
$app->redirect('/', 301);
});