enrol/lti/proxy.php

   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  * Tool proxy.
  19  *
  20  * @package    enrol_lti
  21  * @copyright  2016 John Okely <john@moodle.com>
  22  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24
  25 require_once(__DIR__ . '/../../config.php');
  26
  27 $toolid = null;
  28 $token = null;
  29 $filearguments = get_file_argument();
  30 $arguments = explode('/', trim($filearguments, '/'));
  31 if (count($arguments) == 2) {
  32     list($toolid, $token) = $arguments;
  33 }
  34
  35 $toolid = optional_param('id', $toolid, PARAM_INT);
  36 $token = optional_param('token', $token, PARAM_ALPHANUM);
  37
  38 $PAGE->set_context(context_system::instance());
  39 $url = new moodle_url('/enrol/lti/tp.php');
  40 $PAGE->set_url($url);
  41 $PAGE->set_pagelayout('popup');
  42 $PAGE->set_title(get_string('registration', 'enrol_lti'));
  43
  44 // Only show the proxy if the token parameter is correct.
  45 // If we do not compare with a shared secret, someone could very easily
  46 // guess an id for the enrolment.
  47 if (!\enrol_lti\helper::verify_proxy_token($toolid, $token)) {
  48     throw new \moodle_exception('incorrecttoken', 'enrol_lti');
  49 }
  50 $tool = \enrol_lti\helper::get_lti_tool($toolid);
  51
  52 if (!is_enabled_auth('lti')) {
  53     throw new \moodle_exception('pluginnotenabled', 'auth', '', get_string('pluginname', 'auth_lti'));
  54     exit();
  55 }
  56
  57 // Check if the enrolment plugin is disabled.
  58 if (!enrol_is_enabled('lti')) {
  59     throw new \moodle_exception('enrolisdisabled', 'enrol_lti');
  60     exit();
  61 }
  62
  63 // Check if the enrolment instance is disabled.
  64 if ($tool->status != ENROL_INSTANCE_ENABLED) {
  65     throw new \moodle_exception('enrolisdisabled', 'enrol_lti');
  66     exit();
  67 }
  68
  69 $messagetype = required_param('lti_message_type', PARAM_TEXT);
  70
  71 // Only accept proxy registration requests from this endpoint.
  72 if ($messagetype != "ToolProxyRegistrationRequest") {
  73     throw new \moodle_exception('invalidrequest', 'enrol_lti');
  74     exit();
  75 }
  76
  77 $toolprovider = new \enrol_lti\tool_provider($toolid);
  78 $toolprovider->handleRequest();
  79 echo $OUTPUT->header();
  80 echo $OUTPUT->footer();