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Differences Between: [Versions 310 and 400] [Versions 39 and 400] [Versions 400 and 401] [Versions 400 and 402] [Versions 400 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * This file responds to a login authentication request
  19   *
  20   * @package    mod_lti
  21   * @copyright  2019 Stephen Vickers
  22   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  require_once(__DIR__ . '/../../config.php');
  26  require_once($CFG->dirroot . '/mod/lti/locallib.php');
  27  global $_POST, $_SERVER;
  28  
  29  if (!isloggedin() && empty($_POST['repost'])) {
  30      header_remove("Set-Cookie");
  31      $PAGE->set_pagelayout('popup');
  32      $PAGE->set_context(context_system::instance());
  33      $output = $PAGE->get_renderer('mod_lti');
  34      $page = new \mod_lti\output\repost_crosssite_page($_SERVER['REQUEST_URI'], $_POST);
  35      echo $output->header();
  36      echo $output->render($page);
  37      echo $output->footer();
  38      return;
  39  }
  40  
  41  $scope = optional_param('scope', '', PARAM_TEXT);
  42  $responsetype = optional_param('response_type', '', PARAM_TEXT);
  43  $clientid = optional_param('client_id', '', PARAM_TEXT);
  44  $redirecturi = optional_param('redirect_uri', '', PARAM_URL);
  45  $loginhint = optional_param('login_hint', '', PARAM_TEXT);
  46  $ltimessagehint = optional_param('lti_message_hint', 0, PARAM_INT);
  47  $state = optional_param('state', '', PARAM_TEXT);
  48  $responsemode = optional_param('response_mode', '', PARAM_TEXT);
  49  $nonce = optional_param('nonce', '', PARAM_TEXT);
  50  $prompt = optional_param('prompt', '', PARAM_TEXT);
  51  
  52  $ok = !empty($scope) && !empty($responsetype) && !empty($clientid) &&
  53        !empty($redirecturi) && !empty($loginhint) &&
  54        !empty($nonce) && !empty($SESSION->lti_message_hint);
  55  
  56  if (!$ok) {
  57      $error = 'invalid_request';
  58  }
  59  if ($ok && ($scope !== 'openid')) {
  60      $ok = false;
  61      $error = 'invalid_scope';
  62  }
  63  if ($ok && ($responsetype !== 'id_token')) {
  64      $ok = false;
  65      $error = 'unsupported_response_type';
  66  }
  67  if ($ok) {
  68      list($courseid, $typeid, $id, $titleb64, $textb64) = explode(',', $SESSION->lti_message_hint, 5);
  69      $ok = ($id !== $ltimessagehint);
  70      if (!$ok) {
  71          $error = 'invalid_request';
  72      } else {
  73          $config = lti_get_type_type_config($typeid);
  74          $ok = ($clientid === $config->lti_clientid);
  75          if (!$ok) {
  76              $error = 'unauthorized_client';
  77          }
  78      }
  79  }
  80  if ($ok && ($loginhint !== $USER->id)) {
  81      $ok = false;
  82      $error = 'access_denied';
  83  }
  84  
  85  // If we're unable to load up config; we cannot trust the redirect uri for POSTing to.
  86  if (empty($config)) {
  87      throw new moodle_exception('invalidrequest', 'error');
  88  } else {
  89      $uris = array_map("trim", explode("\n", $config->lti_redirectionuris));
  90      if (!in_array($redirecturi, $uris)) {
  91          throw new moodle_exception('invalidrequest', 'error');
  92      }
  93  }
  94  if ($ok) {
  95      if (isset($responsemode)) {
  96          $ok = ($responsemode === 'form_post');
  97          if (!$ok) {
  98              $error = 'invalid_request';
  99              $desc = 'Invalid response_mode';
 100          }
 101      } else {
 102          $ok = false;
 103          $error = 'invalid_request';
 104          $desc = 'Missing response_mode';
 105      }
 106  }
 107  if ($ok && !empty($prompt) && ($prompt !== 'none')) {
 108      $ok = false;
 109      $error = 'invalid_request';
 110      $desc = 'Invalid prompt';
 111  }
 112  
 113  if ($ok) {
 114      $course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
 115      if ($id) {
 116          $cm = get_coursemodule_from_id('lti', $id, 0, false, MUST_EXIST);
 117          $context = context_module::instance($cm->id);
 118          require_login($course, true, $cm);
 119          require_capability('mod/lti:view', $context);
 120          $lti = $DB->get_record('lti', array('id' => $cm->instance), '*', MUST_EXIST);
 121          $lti->cmid = $cm->id;
 122          list($endpoint, $params) = lti_get_launch_data($lti, $nonce);
 123      } else {
 124          require_login($course);
 125          $context = context_course::instance($courseid);
 126          require_capability('moodle/course:manageactivities', $context);
 127          require_capability('mod/lti:addcoursetool', $context);
 128          // Set the return URL. We send the launch container along to help us avoid frames-within-frames when the user returns.
 129          $returnurlparams = [
 130              'course' => $courseid,
 131              'id' => $typeid,
 132              'sesskey' => sesskey()
 133          ];
 134          $returnurl = new \moodle_url('/mod/lti/contentitem_return.php', $returnurlparams);
 135          // Prepare the request.
 136          $title = base64_decode($titleb64);
 137          $text = base64_decode($textb64);
 138          $request = lti_build_content_item_selection_request($typeid, $course, $returnurl, $title, $text,
 139                                                              [], [], false, true, false, false, false, $nonce);
 140          $endpoint = $request->url;
 141          $params = $request->params;
 142      }
 143  } else {
 144      $params['error'] = $error;
 145      if (!empty($desc)) {
 146          $params['error_description'] = $desc;
 147      }
 148  }
 149  if (isset($state)) {
 150      $params['state'] = $state;
 151  }
 152  unset($SESSION->lti_message_hint);
 153  $r = '<form action="' . $redirecturi . "\" name=\"ltiAuthForm\" id=\"ltiAuthForm\" " .
 154       "method=\"post\" enctype=\"application/x-www-form-urlencoded\">\n";
 155  if (!empty($params)) {
 156      foreach ($params as $key => $value) {
 157          $key = htmlspecialchars($key);
 158          $value = htmlspecialchars($value);
 159          $r .= "  <input type=\"hidden\" name=\"{$key}\" value=\"{$value}\"/>\n";
 160      }
 161  }
 162  $r .= "</form>\n";
 163  $r .= "<script type=\"text/javascript\">\n" .
 164      "//<![CDATA[\n" .
 165      "document.ltiAuthForm.submit();\n" .
 166      "//]]>\n" .
 167      "</script>\n";
 168  echo $r;