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266 lines
9.1 KiB
266 lines
9.1 KiB
<?php
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function buildRedirectURI() {
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return 'http://' . $_SERVER['SERVER_NAME'] . '/auth/callback';
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}
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function clientID() {
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return 'https://quill.p3k.io';
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}
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function build_url($parsed_url) {
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$scheme = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
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$host = isset($parsed_url['host']) ? $parsed_url['host'] : '';
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$port = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
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$user = isset($parsed_url['user']) ? $parsed_url['user'] : '';
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$pass = isset($parsed_url['pass']) ? ':' . $parsed_url['pass'] : '';
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$pass = ($user || $pass) ? "$pass@" : '';
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$path = isset($parsed_url['path']) ? $parsed_url['path'] : '';
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$query = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
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$fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
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return "$scheme$user$pass$host$port$path$query$fragment";
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}
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// Input: Any URL or string like "aaronparecki.com"
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// Output: Normlized URL (default to http if no scheme, force "/" path)
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// or return false if not a valid URL (has query string params, etc)
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function normalizeMeURL($url) {
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$me = parse_url($url);
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if(array_key_exists('path', $me) && $me['path'] == '')
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return false;
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// parse_url returns just "path" for naked domains
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if(count($me) == 1 && array_key_exists('path', $me)) {
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$me['host'] = $me['path'];
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unset($me['path']);
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}
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if(!array_key_exists('scheme', $me))
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$me['scheme'] = 'http';
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if(!array_key_exists('path', $me))
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$me['path'] = '/';
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// Invalid scheme
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if(!in_array($me['scheme'], array('http','https')))
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return false;
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// Invalid path
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if($me['path'] != '/')
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return false;
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// query and fragment not allowed
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if(array_key_exists('query', $me) || array_key_exists('fragment', $me))
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return false;
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return build_url($me);
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}
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$app->get('/', function($format='html') use($app) {
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$res = $app->response();
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ob_start();
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render('index', array(
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'title' => 'Quill',
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'meta' => ''
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));
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$html = ob_get_clean();
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$res->body($html);
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});
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$app->get('/auth/start', function() use($app) {
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$req = $app->request();
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$params = $req->params();
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// the "me" parameter is user input, and may be in a couple of different forms:
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// aaronparecki.com http://aaronparecki.com http://aaronparecki.com/
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// Normlize the value now (move this into a function in IndieAuth\Client later)
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if(!array_key_exists('me', $params) || !($me = normalizeMeURL($params['me']))) {
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$html = render('auth_error', array(
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'title' => 'Sign In',
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'error' => 'Invalid "me" Parameter',
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'errorDescription' => 'The URL you entered, "<strong>' . $params['me'] . '</strong>" is not valid.'
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));
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$app->response()->body($html);
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return;
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}
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$authorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($me);
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$tokenEndpoint = IndieAuth\Client::discoverTokenEndpoint($me);
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$micropubEndpoint = IndieAuth\Client::discoverMicropubEndpoint($me);
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if($tokenEndpoint && $micropubEndpoint && $authorizationEndpoint) {
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// Generate a "state" parameter for the request
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$state = IndieAuth\Client::generateStateParameter();
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$_SESSION['auth_state'] = $state;
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$scope = 'post';
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$authorizationURL = IndieAuth\Client::buildAuthorizationURL($authorizationEndpoint, $me, buildRedirectURI(), clientID(), $state, $scope);
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} else {
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$authorizationURL = false;
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}
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// If the user has already signed in before and has a micropub access token, skip
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// the debugging screens and redirect immediately to the auth endpoint.
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// This will still generate a new access token when they finish logging in.
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$user = ORM::for_table('users')->where('url', $me)->find_one();
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if($user && $user->micropub_access_token && !array_key_exists('restart', $params)) {
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$user->micropub_endpoint = $micropubEndpoint;
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$user->authorization_endpoint = $authorizationEndpoint;
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$user->token_endpoint = $tokenEndpoint;
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$user->save();
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$app->redirect($authorizationURL, 301);
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} else {
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if(!$user)
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$user = ORM::for_table('users')->create();
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$user->url = $me;
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$user->date_created = date('Y-m-d H:i:s');
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$user->micropub_endpoint = $micropubEndpoint;
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$user->authorization_endpoint = $authorizationEndpoint;
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$user->token_endpoint = $tokenEndpoint;
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$user->save();
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$html = render('auth_start', array(
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'title' => 'Sign In',
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'me' => $me,
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'authorizing' => $me,
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'meParts' => parse_url($me),
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'tokenEndpoint' => $tokenEndpoint,
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'micropubEndpoint' => $micropubEndpoint,
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'authorizationEndpoint' => $authorizationEndpoint,
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'authorizationURL' => $authorizationURL
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));
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$app->response()->body($html);
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}
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});
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$app->get('/auth/callback', function() use($app) {
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$req = $app->request();
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$params = $req->params();
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// Double check there is a "me" parameter
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// Should only fail for really hacked up requests
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if(!array_key_exists('me', $params) || !($me = normalizeMeURL($params['me']))) {
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$html = render('auth_error', array(
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'title' => 'Auth Callback',
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'error' => 'Invalid "me" Parameter',
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'errorDescription' => 'The ID you entered, <strong>' . $params['me'] . '</strong> is not valid.'
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));
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$app->response()->body($html);
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return;
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}
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// If there is no state in the session, start the login again
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if(!array_key_exists('auth_state', $_SESSION)) {
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$app->redirect('/auth/start?me='.urlencode($params['me']));
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return;
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}
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if(!array_key_exists('code', $params) || trim($params['code']) == '') {
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$html = render('auth_error', array(
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'title' => 'Auth Callback',
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'error' => 'Missing authorization code',
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'errorDescription' => 'No authorization code was provided in the request.'
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));
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$app->response()->body($html);
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return;
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}
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// Verify the state came back and matches what we set in the session
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// Should only fail for malicious attempts, ok to show a not as nice error message
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if(!array_key_exists('state', $params)) {
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$html = render('auth_error', array(
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'title' => 'Auth Callback',
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'error' => 'Missing state parameter',
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'errorDescription' => 'No state parameter was provided in the request. This shouldn\'t happen. It is possible this is a malicious authorization attempt.'
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));
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$app->response()->body($html);
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return;
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}
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if($params['state'] != $_SESSION['auth_state']) {
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$html = render('auth_error', array(
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'title' => 'Auth Callback',
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'error' => 'Invalid state',
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'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.'
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));
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$app->response()->body($html);
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return;
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}
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// Now the basic sanity checks have passed. Time to start providing more helpful messages when there is an error.
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// An authorization code is in the query string, and we want to exchange that for an access token at the token endpoint.
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// Discover the endpoints
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$micropubEndpoint = IndieAuth\Client::discoverMicropubEndpoint($me);
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$tokenEndpoint = IndieAuth\Client::discoverTokenEndpoint($me);
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if($tokenEndpoint) {
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$token = IndieAuth\Client::getAccessToken($tokenEndpoint, $params['code'], $params['me'], buildRedirectURI(), clientID(), $params['state'], true);
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} else {
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$token = array('auth'=>false, 'response'=>false);
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}
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$redirectToDashboardImmediately = false;
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// If a valid access token was returned, store the token info in the session and they are signed in
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if(k($token['auth'], array('me','access_token','scope'))) {
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$_SESSION['auth'] = $token['auth'];
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$_SESSION['me'] = $params['me'];
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$user = ORM::for_table('users')->where('url', $me)->find_one();
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if($user) {
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// Already logged in, update the last login date
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$user->last_login = date('Y-m-d H:i:s');
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// If they have logged in before and we already have an access token, then redirect to the dashboard now
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if($user->micropub_access_token)
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$redirectToDashboardImmediately = true;
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} else {
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// New user! Store the user in the database
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$user = ORM::for_table('users')->create();
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$user->url = $me;
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$user->date_created = date('Y-m-d H:i:s');
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}
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$user->micropub_endpoint = $micropubEndpoint;
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$user->micropub_access_token = $token['auth']['access_token'];
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$user->micropub_scope = $token['auth']['scope'];
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$user->micropub_response = $token['response'];
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$user->save();
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$_SESSION['user_id'] = $user->id();
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}
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unset($_SESSION['auth_state']);
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if($redirectToDashboardImmediately) {
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$app->redirect('/new', 301);
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} else {
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$html = render('auth_callback', array(
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'title' => 'Sign In',
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'me' => $me,
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'authorizing' => $me,
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'meParts' => parse_url($me),
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'tokenEndpoint' => $tokenEndpoint,
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'auth' => $token['auth'],
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'response' => $token['response'],
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'curl_error' => (array_key_exists('error', $token) ? $token['error'] : false)
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));
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$app->response()->body($html);
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}
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});
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$app->get('/signout', function() use($app) {
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unset($_SESSION['auth']);
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unset($_SESSION['me']);
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unset($_SESSION['auth_state']);
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unset($_SESSION['user_id']);
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$app->redirect('/', 301);
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});
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