1 files changed, 268 insertions, 0 deletions
diff --git a/controllers/auth.php b/controllers/auth.php
new file mode 100644
index 0000000..208f0f8
--- /dev/null
+++ b/controllers/auth.php
@@ -0,0 +1,268 @@
+<?php
+
+function buildRedirectURI() {
+  return 'http://' . $_SERVER['SERVER_NAME'] . '/auth/callback';
+}
+
+function clientID() {
+  return 'https://indiepost.micropub.net';
+}
+
+function build_url($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$fragment"; 
+} 
+
+// Input: Any URL or string like "aaronparecki.com"
+// Output: Normlized URL (default to http if no scheme, force "/" path)
+//         or return false if not a valid URL (has query string params, etc)
+function normalizeMeURL($url) {
+  $me = parse_url($url);
+
+  // parse_url returns just "path" for naked domains
+  if(count($me) == 1 && array_key_exists('path', $me)) {
+    $me['host'] = $me['path'];
+    unset($me['path']);
+  }
+
+  if(!array_key_exists('scheme', $me))
+    $me['scheme'] = 'http';
+
+  if(!array_key_exists('path', $me))
+    $me['path'] = '/';
+
+  // Invalid scheme
+  if(!in_array($me['scheme'], array('http','https')))
+    return false;
+
+  // Invalid path
+  if($me['path'] != '/')
+    return false;
+
+  // query and fragment not allowed
+  if(array_key_exists('query', $me) || array_key_exists('fragment', $me))
+    return false;
+
+  return build_url($me);
+}
+
+$app->get('/', function($format='html') use($app) {
+  $res = $app->response();
+
+
+  ob_start();
+  render('index', array(
+    'title' => 'OwnYourGram',
+    'meta' => ''
+  ));
+  $html = ob_get_clean();
+  $res->body($html);
+});
+
+$app->get('/signin', function() use($app) {
+  $html = render('signin', array('title' => 'Sign In'));
+  $app->response()->body($html);
+});
+
+$app->get('/auth/start', function() use($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 = normalizeMeURL($params['me']))) {
+    $html = render('auth_error', array(
+      'title' => 'Sign In',
+      'error' => 'Invalid "me" Parameter',
+      'errorDescription' => 'The ID you entered, <strong>' . $params['me'] . '</strong> is not valid.'
+    ));
+    $app->response()->body($html);
+    return;
+  }
+
+  $authorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($me);
+  $tokenEndpoint = IndieAuth\Client::discoverTokenEndpoint($me);
+  $micropubEndpoint = IndieAuth\Client::discoverMicropubEndpoint($me);
+
+  if($tokenEndpoint && $micropubEndpoint && $authorizationEndpoint) {
+    // Generate a "state" parameter for the request
+    $state = IndieAuth\Client::generateStateParameter();
+    $_SESSION['auth_state'] = $state;
+
+    $scope = 'post';
+    $authorizationURL = IndieAuth\Client::buildAuthorizationURL($authorizationEndpoint, $me, buildRedirectURI(), clientID(), $state, $scope);
+  } else {
+    $authorizationURL = false;
+  }
+
+  // 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', $me)->find_one();
+  if($user && $user->micropub_access_token && !array_key_exists('restart', $params)) {
+
+    $user->micropub_endpoint = $micropubEndpoint;
+    $user->authorization_endpoint = $authorizationEndpoint;
+    $user->token_endpoint = $tokenEndpoint;
+    $user->save();
+
+    $app->redirect($authorizationURL, 301);
+
+  } else {
+
+    if(!$user)
+      $user = ORM::for_table('users')->create();
+    $user->url = $me;
+    $user->date_created = date('Y-m-d H:i:s');
+    $user->micropub_endpoint = $micropubEndpoint;
+    $user->authorization_endpoint = $authorizationEndpoint;
+    $user->token_endpoint = $tokenEndpoint;
+    $user->save();
+
+    $html = render('auth_start', array(
+      'title' => 'Sign In',
+      'me' => $me,
+      'authorizing' => $me,
+      'meParts' => parse_url($me),
+      'tokenEndpoint' => $tokenEndpoint,
+      'micropubEndpoint' => $micropubEndpoint,
+      'authorizationEndpoint' => $authorizationEndpoint,
+      'authorizationURL' => $authorizationURL
+    ));
+    $app->response()->body($html);
+  }
+});
+
+$app->get('/auth/callback', function() use($app) {
+  $req = $app->request();
+  $params = $req->params();
+
+  // Double check there is a "me" parameter
+  // Should only fail for really hacked up requests
+  if(!array_key_exists('me', $params) || !($me = normalizeMeURL($params['me']))) {
+    $html = render('auth_error', array(
+      'title' => 'Auth Callback',
+      'error' => 'Invalid "me" Parameter',
+      'errorDescription' => 'The ID you entered, <strong>' . $params['me'] . '</strong> is not valid.'
+    ));
+    $app->response()->body($html);
+    return;
+  }
+
+  // If there is no state in the session, start the login again
+  if(!array_key_exists('auth_state', $_SESSION)) {
+    $app->redirect('/auth/start?me='.urlencode($params['me']));
+    return;
+  }
+
+  if(!array_key_exists('code', $params) || trim($params['code']) == '') {
+    $html = render('auth_error', array(
+      'title' => 'Auth Callback',
+      'error' => 'Missing authorization code',
+      'errorDescription' => 'No authorization code was provided in the request.'
+    ));
+    $app->response()->body($html);
+    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)) {
+    $html = 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.'
+    ));
+    $app->response()->body($html);
+    return;
+  }
+
+  if($params['state'] != $_SESSION['auth_state']) {
+    $html = 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.'
+    ));
+    $app->response()->body($html);
+    return;
+  }
+
+  // Now the basic sanity 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.
+
+  // Discover the endpoints
+  $micropubEndpoint = IndieAuth\Client::discoverMicropubEndpoint($me);
+  $tokenEndpoint = IndieAuth\Client::discoverTokenEndpoint($me);
+
+  if($tokenEndpoint) {
+    $token = IndieAuth\Client::getAccessToken($tokenEndpoint, $params['code'], $params['me'], buildRedirectURI(), clientID(), $params['state'], true);
+
+  } else {
+    $token = array('auth'=>false, 'response'=>false);
+  }
+
+  $redirectToDashboardImmediately = false;
+
+  // If a valid access token was returned, store the token info in the session and they are signed in
+  if(k($token['auth'], array('me','access_token','scope'))) {
+    $_SESSION['auth'] = $token['auth'];
+    $_SESSION['me'] = $params['me'];
+
+    $user = ORM::for_table('users')->where('url', $me)->find_one();
+    if($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->micropub_access_token)
+        $redirectToDashboardImmediately = true;
+    } else {
+      // New user! Store the user in the database
+      $user = ORM::for_table('users')->create();
+      $user->url = $me;
+      $user->date_created = date('Y-m-d H:i:s');
+    }
+    $user->micropub_endpoint = $micropubEndpoint;
+    $user->micropub_access_token = $token['auth']['access_token'];
+    $user->micropub_scope = $token['auth']['scope'];
+    $user->micropub_response = $token['response'];
+    $user->save();
+    $_SESSION['user_id'] = $user->id();
+  }
+
+  unset($_SESSION['auth_state']);
+
+  if($redirectToDashboardImmediately) {
+    $app->redirect('/new', 301);
+  } else {
+    $html = 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)
+    ));
+    $app->response()->body($html);
+  }
+});
+
+$app->get('/signout', function() use($app) {
+  unset($_SESSION['auth']);
+  unset($_SESSION['me']);
+  unset($_SESSION['auth_state']);
+  unset($_SESSION['user_id']);
+  $app->redirect('/', 301);
+});
+