summaryrefslogtreecommitdiff
path: root/controllers/auth.php
blob: a02e047b826b0a7b583399cba725784a986c7013 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
<?php

function buildRedirectURI($params = array()) {
  return Config::$base_url . 'auth/callback?' . http_build_query($params);
}

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";
}

$app->get('/', function($format='html') use($app) {
  $res = $app->response();
  $params = $app->request()->params();
  if (k($params, 'me')) {
    $app->redirect('/auth/start?'.http_build_query($params), 302);
  }

  ob_start();
  render('index', array(
    'title' => 'Quill',
    'meta' => '',
    'authorizing' => false
  ));
  $html = ob_get_clean();
  $res->body($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/
  if(!array_key_exists('me', $params) || !($me = IndieAuth\Client::normalizeMeURL($params['me']))) {
    $html = render('auth_error', array(
      'title' => 'Sign In',
      'error' => 'Invalid "me" Parameter',
      'errorDescription' => 'The URL you entered, "<strong>' . $params['me'] . '</strong>" is not valid.'
    ));
    $app->response()->body($html);
    return;
  }

  if(k($params, 'redirect')) {
    $_SESSION['redirect_after_login'] = $params['redirect'];
  }

  $authorizationEndpoint = IndieAuth\Client::discoverAuthorizationEndpoint($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';
    $cleanparams = $params;
    unset($cleanparams['me']);
    unset($cleanparams['redirect']);
    $authorizationURL = IndieAuth\Client::buildAuthorizationURL($authorizationEndpoint, $me, buildRedirectURI($cleanparams), Config::$base_url, $state, $scope);
  } else {
    $authorizationURL = false;
  }

  // If the user has already signed in before and has a micropub access token,
  // and the endpoints are all the same, 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
    && $user->micropub_endpoint == $micropubEndpoint
    && $user->token_endpoint == $tokenEndpoint
    && $user->authorization_endpoint == $authorizationEndpoint
    && !array_key_exists('restart', $params)) {

    // TODO: fix this by caching the endpoints maybe in the session instead of writing them to the DB here.
    // Then remove the line below that blanks out the access token
    $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->micropub_access_token = ''; // blank out the access token if they attempt to sign in again
    $user->save();

    if (k($params, 'dontask') && $params['dontask']) {
        $app->redirect($authorizationURL, 302);
    }

    $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 = IndieAuth\Client::normalizeMeURL($params['me']))) {
    if(array_key_exists('me', $params))
      $error = 'The ID you entered, <strong>' . $params['me'] . '</strong> is not valid.';
    else
      $error = 'There was no "me" parameter in the callback.';
    $html = render('auth_error', array(
      'title' => 'Auth Callback',
      'error' => 'Invalid "me" Parameter',
      'errorDescription' => $error
    ));
    $app->response()->body($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'], $params['me'], buildRedirectURI(), Config::$base_url, k($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();

    // Make a request to the micropub endpoint to discover the syndication targets and media endpoint if any.
    // Errors are silently ignored here. The user will be able to retry from the new post interface and get feedback.
    get_micropub_config($user);
  }

  unset($_SESSION['auth_state']);

  if($redirectToDashboardImmediately || k($params, 'dontask')) {
    if(k($_SESSION, 'redirect_after_login')) {
      $dest = $_SESSION['redirect_after_login'];
      unset($_SESSION['redirect_after_login']);
      $app->redirect($dest, 301);
    } else {
      $cleanparams = $params;
      unset($cleanparams['code']);
      unset($cleanparams['me']);
      unset($cleanparams['state']);
      $app->redirect('/new?' . http_build_query($cleanparams), 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) ? $token['error'] : false),
      'destination' => (k($_SESSION, 'redirect_after_login') ?: '/new')
    ));
    $app->response()->body($html);
  }
});

$app->get('/signout', function() use($app) {
  unset($_SESSION['auth']);
  unset($_SESSION['me']);
  unset($_SESSION['auth_state']);
  unset($_SESSION['user_id']);
  $app->redirect('/', 301);
});