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117 lines
4.6 KiB
117 lines
4.6 KiB
<?php
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use Symfony\Component\HttpFoundation\Request;
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use Symfony\Component\HttpFoundation\Response;
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use \Firebase\JWT\JWT;
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class Auth {
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public function login(Request $request, Response $response) {
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$response->setContent(view('login', [
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'title' => 'Sign In to Telegraph',
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'return_to' => $request->get('return_to')
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]));
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return $response;
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}
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public function login_start(Request $request, Response $response) {
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if(!$request->get('url') || !($me = IndieAuth\Client::normalizeMeURL($request->get('url')))) {
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$response->setContent(view('login', [
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'title' => 'Sign In to Telegraph',
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'error' => 'Invalid URL',
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'error_description' => 'The URL you entered, "<strong>' . htmlspecialchars($request->get('url')) . '</strong>" is not valid.'
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]));
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return $response;
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}
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$authorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($me);
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$state = JWT::encode([
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'me' => $me,
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'authorization_endpoint' => $authorizationEndpoint,
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'return_to' => $request->get('return_to'),
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'time' => time(),
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'exp' => time()+300 // verified by the JWT library
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], Config::$secretKey);
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if($authorizationEndpoint) {
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// If the user specified only an authorization endpoint, use that
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$authorizationURL = IndieAuth\Client::buildAuthorizationURL($authorizationEndpoint, $me, self::_buildRedirectURI(), Config::$clientID, $state);
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} else {
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// Otherwise, fall back to indieauth.com
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$authorizationURL = IndieAuth\Client::buildAuthorizationURL(Config::$defaultAuthorizationEndpoint, $me, self::_buildRedirectURI(), Config::$clientID, $state);
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}
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$response->setStatusCode(302);
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$response->headers->set('Location', $authorizationURL);
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return $response;
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}
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public function login_callback(Request $request, Response $response) {
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if(!$request->get('state') || !$request->get('code') || !$request->get('me')) {
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$response->setContent(view('login', [
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'title' => 'Sign In to Telegraph',
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'error' => 'Missing Parameters',
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'error_description' => 'The auth server did not return the necessary parameters, <code>state</code> and <code>code</code> and <code>me</code>.'
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]));
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return $response;
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}
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// Validate the "state" parameter to ensure this request originated at this client
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try {
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$state = JWT::decode($request->get('state'), Config::$secretKey, ['HS256']);
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if(!$state) {
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$response->setContent(view('login', [
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'title' => 'Sign In to Telegraph',
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'error' => 'Invalid State',
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'error_description' => 'The <code>state</code> parameter was not valid.'
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]));
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return $response;
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}
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} catch(Exception $e) {
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$response->setContent(view('login', [
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'title' => 'Sign In to Telegraph',
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'error' => 'Invalid State',
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'error_description' => 'The <code>state</code> parameter was invalid:<br>'.htmlspecialchars($e->getMessage())
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]));
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return $response;
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}
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// Discover the authorization endpoint from the "me" that was returned by the auth server
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// This allows the auth server to return a different URL than the user originally entered,
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// for example if the user enters multiusersite.example the auth server can return multiusersite.example/alice
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if($state->authorization_endpoint) { // only discover the auth endpoint if one was originally found, otherwise use our fallback
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$authorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($request->get('me'));
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} else {
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$authorizationEndpoint = Config::$defaultAuthorizationEndpoint;
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}
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// Verify the code with the auth server
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$token = IndieAuth\Client::verifyIndieAuthCode($authorizationEndpoint, $request->get('code'), $request->get('me'), self::_buildRedirectURI(), Config::$clientID, $request->get('state'), true);
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if(!array_key_exists('auth', $token) || !array_key_exists('me', $token['auth'])) {
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// The auth server didn't return a "me" URL
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$response->setContent(view('login', [
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'title' => 'Sign In to Telegraph',
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'error' => 'Invalid Auth Server Response',
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'error_description' => 'The authorization server did not return a valid response:<br>'.htmlspecialchars(json_encode($token))
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]));
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return $response;
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}
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// Create or load the user
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session_start();
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$_SESSION['me'] = $token['auth']['me'];
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$response->setStatusCode(302);
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$response->headers->set('Location', ($state->return_to ?: '/dashboard'));
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return $response;
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}
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private static function _buildRedirectURI() {
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return 'http' . (Config::$ssl ? 's' : '') . '://' . $_SERVER['SERVER_NAME'] . '/login/callback';
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}
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}
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