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  1. <?php
  2.  
  3. /*
  4.  * OIDplus 2.0
  5.  * Copyright 2020 Daniel Marschall, ViaThinkSoft
  6.  *
  7.  * Licensed under the Apache License, Version 2.0 (the "License");
  8.  * you may not use this file except in compliance with the License.
  9.  * You may obtain a copy of the License at
  10.  *
  11.  *     http://www.apache.org/licenses/LICENSE-2.0
  12.  *
  13.  * Unless required by applicable law or agreed to in writing, software
  14.  * distributed under the License is distributed on an "AS IS" BASIS,
  15.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16.  * See the License for the specific language governing permissions and
  17.  * limitations under the License.
  18.  */
  19.  
  20. # More information about the OAuth2 implementation:
  21. # - https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow
  22. # - https://developers.facebook.com/tools/explorer/
  23.  
  24. require_once __DIR__ . '/../../../includes/oidplus.inc.php';
  25.  
  26. OIDplus::init(true);
  27. set_exception_handler(array('OIDplusGui', 'html_exception_handler'));
  28.  
  29. if (!OIDplus::baseConfig()->getValue('FACEBOOK_OAUTH2_ENABLED', false)) {
  30.         throw new OIDplusException(_L('Facebook OAuth authentication is disabled on this system.'));
  31. }
  32.  
  33. if (!isset($_GET['code'])) die();
  34. if (!isset($_GET['state'])) die();
  35.  
  36. if ($_GET['state'] != $_COOKIE['csrf_token']) {
  37.         die('Invalid CSRF token');
  38. }
  39.  
  40. if (!function_exists('curl_init')) {
  41.         die(_L('The "%1" PHP extension is not installed at your system. Please enable the PHP extension <code>%2</code>.','CURL','php_curl'));
  42. }
  43.  
  44. // Get access token
  45.  
  46. $ch = curl_init();
  47. if (ini_get('curl.cainfo') == '') curl_setopt($ch, CURLOPT_CAINFO, OIDplus::localpath() . '3p/certs/cacert.pem');
  48. curl_setopt($ch, CURLOPT_URL,"https://graph.facebook.com/v8.0/oauth/access_token?".
  49.         "client_id=".urlencode(OIDplus::baseConfig()->getValue('FACEBOOK_OAUTH2_CLIENT_ID'))."&".
  50.         "redirect_uri=".urlencode(OIDplus::webpath(__DIR__,false).'oauth.php')."&".
  51.         "client_secret=".urlencode(OIDplus::baseConfig()->getValue('FACEBOOK_OAUTH2_CLIENT_SECRET'))."&".
  52.         "code=".$_GET['code']
  53. );
  54. curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  55. $cont = curl_exec($ch);
  56. curl_close($ch);
  57. $data = json_decode($cont,true);
  58. if (isset($data['error'])) {
  59.         echo '<h2>Error at step 2</h2>';
  60.         echo '<p>'.$data['error']['message'].'</p>';
  61.         die();
  62. }
  63. $access_token = $data['access_token'];
  64.  
  65. // Get user infos
  66.  
  67. $ch = curl_init();
  68. if (ini_get('curl.cainfo') == '') curl_setopt($ch, CURLOPT_CAINFO, OIDplus::localpath() . '3p/certs/cacert.pem');
  69. curl_setopt($ch, CURLOPT_URL,"https://graph.facebook.com/v8.0/me?".
  70.         "fields=id,email,name&".
  71.         "access_token=".urlencode($access_token)
  72. );
  73. curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  74. $cont = curl_exec($ch);
  75. curl_close($ch);
  76. $data = json_decode($cont,true);
  77. if (isset($data['error'])) {
  78.         throw new OIDplusException(_L('Error receiving the authentication token from %1: %2','Facebook',$data['error']['message']));
  79. }
  80. $personal_name = $data['name'];
  81. $email = !isset($data['email']) ? '' : $data['email'];
  82. if (empty($email)) {
  83.         throw new OIDplusException(_L('Your Facebook account does not have an email address.'));
  84. }
  85.  
  86. // Everything's done! Now login and/or create account
  87.  
  88. if (!empty($email)) {
  89.         $ra = new OIDplusRA($email);
  90.         if (!$ra->existing()) {
  91.                 $ra->register_ra(null); // create a user account without password
  92.  
  93.                 OIDplus::db()->query("update ###ra set ra_name = ?, personal_name = ? where email = ?", array($personal_name, $personal_name, $email));
  94.  
  95.                 OIDplus::logger()->log("[INFO]RA($email)!", "RA '$email' was created because of successful Facebook OAuth2 login");
  96.         }
  97.  
  98.         OIDplus::logger()->log("[OK]RA($email)!", "RA '$email' logged in via Facebook OAuth2");
  99.         OIDplus::authUtils()::raLogin($email);
  100.  
  101.         OIDplus::db()->query("UPDATE ###ra set last_login = ".OIDplus::db()->sqlDate()." where email = ?", array($email));
  102.  
  103.         // Go back to OIDplus
  104.  
  105.         header('Location:'.OIDplus::webpath(null,false));
  106. }
  107.