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387 lines
14 KiB
387 lines
14 KiB
<?php
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use Abraham\TwitterOAuth\TwitterOAuth;
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function buildRedirectURI() {
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return Config::$base_url . 'auth/callback';
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}
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$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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if(!array_key_exists('me', $params) || !($me = IndieAuth\Client::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($html);
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return;
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}
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if(k($params, 'redirect')) {
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$_SESSION['redirect_after_login'] = $params['redirect'];
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}
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if(k($params, 'reply')) {
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$_SESSION['reply'] = $params['reply'];
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}
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$_SESSION['attempted_me'] = $me;
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$authorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($me);
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$tokenEndpoint = IndieAuth\Client::discoverTokenEndpoint($me);
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$micropubEndpoint = IndieAuth\Client::discoverMicropubEndpoint($me);
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$defaultScope = 'create update media';
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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'] = $state;
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$authorizationURL = IndieAuth\Client::buildAuthorizationURL($authorizationEndpoint, $me, buildRedirectURI(), Config::$base_url, $state, $defaultScope);
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} else {
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$authorizationURL = false;
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}
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// If the user has already signed in before and has a micropub access token,
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// and the endpoints are all the same, skip the debugging screens and redirect
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// 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
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&& $user->micropub_endpoint == $micropubEndpoint
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&& $user->token_endpoint == $tokenEndpoint
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&& $user->authorization_endpoint == $authorizationEndpoint
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&& !array_key_exists('restart', $params)) {
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// TODO: fix this by caching the endpoints maybe in the session instead of writing them to the DB here.
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// Then remove the line below that blanks out the access token
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$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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// Request whatever scope was previously granted
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$authorizationURL = parse_url($authorizationURL);
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$authorizationURL['scope'] = $user->micropub_scope;
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$authorizationURL = http_build_url($authorizationURL);
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$app->redirect($authorizationURL, 302);
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} else {
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if(!$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->micropub_access_token = ''; // blank out the access token if they attempt to sign in again
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$user->save();
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if(k($params, 'dontask') && $params['dontask']) {
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// Request whatever scope was previously granted
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$authorizationURL = parse_url($authorizationURL);
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$authorizationURL['scope'] = $user->micropub_scope ?: $defaultScope;
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$authorizationURL = http_build_url($authorizationURL);
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$_SESSION['dontask'] = 1;
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$app->redirect($authorizationURL, 302);
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}
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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/redirect', function() use($app) {
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$req = $app->request();
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$params = $req->params();
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if(!isset($params['scope']))
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$params['scope'] = '';
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$authorizationURL = parse_url($params['authorization_url']);
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parse_str($authorizationURL['query'], $query);
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$query['scope'] = $params['scope'];
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$authorizationURL['query'] = http_build_query($query);
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$authorizationURL = http_build_url($authorizationURL);
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$app->redirect($authorizationURL);
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return;
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});
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$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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// 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('/?error=missing_session_state');
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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, or your authorization server failed to pass back the "state" parameter.'
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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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if(!isset($_SESSION['attempted_me'])) {
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$html = render('auth_error', [
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'title' => 'Auth Callback',
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'error' => 'Missing data',
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'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.'
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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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$me = $_SESSION['attempted_me'];
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// Now the basic sanity checks have passed. Time to start providing more helpful messages when there is an error.
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// An authorization code is in the query string, and we want to exchange that for an access token at the token endpoint.
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// Discover the endpoints
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$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'], $me, buildRedirectURI(), Config::$base_url, k($params,'state'), true);
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} else {
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$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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// Double check that the domain of the returned "me" matches the expected
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if(parse_url($token['auth']['me'], PHP_URL_HOST) != parse_url($me, PHP_URL_HOST)) {
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$html = render('auth_error', [
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'title' => 'Error Signing In',
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'error' => 'Invalid user',
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'errorDescription' => 'The user URL that was returned in the access token did not match the domain of the user signing in.'
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]);
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$app->response()->body($html);
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return;
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}
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$_SESSION['auth'] = $token['auth'];
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$_SESSION['me'] = $me = $token['auth']['me'];
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$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'] = $user->id();
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// Make a request to the micropub endpoint to discover the syndication targets and media endpoint if any.
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// Errors are silently ignored here. The user will be able to retry from the new post interface and get feedback.
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get_micropub_config($user, ['q'=>'config']);
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}
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unset($_SESSION['auth_state']);
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unset($_SESSION['attempted_me']);
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if($redirectToDashboardImmediately || k($_SESSION, 'dontask')) {
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unset($_SESSION['dontask']);
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if(k($_SESSION, 'redirect_after_login')) {
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$dest = $_SESSION['redirect_after_login'];
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unset($_SESSION['redirect_after_login']);
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$app->redirect($dest, 302);
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} else {
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$query = [];
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if(k($_SESSION, 'reply')) {
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$query['reply'] = $_SESSION['reply'];
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unset($_SESSION['reply']);
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}
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$app->redirect('/new?' . http_build_query($query), 302);
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}
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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) ? $token['error'] : false),
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'destination' => (k($_SESSION, 'redirect_after_login') ?: '/new')
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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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$app->redirect('/', 302);
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});
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$app->post('/auth/reset', function() use($app) {
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if($user=require_login($app, false)) {
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revoke_micropub_token($user->micropub_access_token, $user->token_endpoint);
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$user->authorization_endpoint = '';
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$user->token_endpoint = '';
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$user->micropub_endpoint = '';
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$user->authorization_endpoint = '';
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$user->micropub_media_endpoint = '';
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$user->micropub_scope = '';
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$user->micropub_access_token = '';
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$user->save();
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unset($_SESSION['auth']);
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unset($_SESSION['me']);
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unset($_SESSION['auth_state']);
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unset($_SESSION['user_id']);
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}
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$app->redirect('/', 302);
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});
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$app->post('/auth/twitter', function() use($app) {
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if($user=require_login($app, false)) {
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$params = $app->request()->params();
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// User just auth'd with twitter, store the access token
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$user->twitter_access_token = $params['twitter_token'];
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$user->twitter_token_secret = $params['twitter_secret'];
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$user->save();
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$app->response()['Content-type'] = 'application/json';
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$app->response()->body(json_encode(array(
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'result' => 'ok'
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)));
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} else {
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$app->response()['Content-type'] = 'application/json';
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$app->response()->body(json_encode(array(
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'result' => 'error'
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)));
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}
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});
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function getTwitterLoginURL(&$twitter) {
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$request_token = $twitter->oauth('oauth/request_token', [
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'oauth_callback' => Config::$base_url . 'auth/twitter/callback'
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]);
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$_SESSION['twitter_auth'] = $request_token;
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return $twitter->url('oauth/authorize', ['oauth_token' => $request_token['oauth_token']]);
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}
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$app->get('/auth/twitter', function() use($app) {
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$params = $app->request()->params();
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if($user=require_login($app, false)) {
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// If there is an existing Twitter token, check if it is valid
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// Otherwise, generate a Twitter login link
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$twitter_login_url = false;
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if(array_key_exists('login', $params)) {
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$twitter = new TwitterOAuth(Config::$twitterClientID, Config::$twitterClientSecret);
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$twitter_login_url = getTwitterLoginURL($twitter);
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} else {
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$twitter = new TwitterOAuth(Config::$twitterClientID, Config::$twitterClientSecret,
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$user->twitter_access_token, $user->twitter_token_secret);
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if($user->twitter_access_token) {
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if($twitter->get('account/verify_credentials')) {
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$app->response()['Content-type'] = 'application/json';
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$app->response()->body(json_encode(array(
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'result' => 'ok'
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)));
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return;
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} else {
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// If the existing twitter token is not valid, generate a login link
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$twitter_login_url = getTwitterLoginURL($twitter);
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}
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} else {
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$twitter_login_url = getTwitterLoginURL($twitter);
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}
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}
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$app->response()['Content-type'] = 'application/json';
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$app->response()->body(json_encode(array(
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'url' => $twitter_login_url
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)));
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} else {
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$app->response()['Content-type'] = 'application/json';
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$app->response()->body(json_encode(array(
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'result' => 'error'
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)));
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}
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});
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$app->get('/auth/twitter/callback', function() use($app) {
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if($user=require_login($app)) {
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$params = $app->request()->params();
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$twitter = new TwitterOAuth(Config::$twitterClientID, Config::$twitterClientSecret,
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$_SESSION['twitter_auth']['oauth_token'], $_SESSION['twitter_auth']['oauth_token_secret']);
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$credentials = $twitter->oauth('oauth/access_token', ['oauth_verifier' => $params['oauth_verifier']]);
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$user->twitter_access_token = $credentials['oauth_token'];
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$user->twitter_token_secret = $credentials['oauth_token_secret'];
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$user->twitter_username = $credentials['screen_name'];
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$user->save();
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$app->redirect('/settings');
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}
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});
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