enrol/lti/launch_deeplink.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  * Handles LTI 1.3 deep linking launches.
  19  *
  20  * There are 2 pathways through this page:
  21  * 1. When first making a deep linking launch from the platform. The launch data is cached at this point, pending user
  22  * authentication, and the page is set such that the post-authentication redirect will return here.
  23  * 2. The post-authentication redirect. The launch data is fetched from the session launch cache, and the resource
  24  * selection view is rendered.
  25  *
  26  * @package    enrol_lti
  27  * @copyright  2021 Jake Dallimore <jrhdallimore@gmail.com>
  28  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  29  */
  30
  31 use core\http_client;
  32 use enrol_lti\local\ltiadvantage\lib\lti_cookie;
  33 use enrol_lti\local\ltiadvantage\lib\issuer_database;
  34 use enrol_lti\local\ltiadvantage\lib\launch_cache_session;
  35 use enrol_lti\local\ltiadvantage\repository\application_registration_repository;
  36 use enrol_lti\local\ltiadvantage\repository\deployment_repository;
  37 use enrol_lti\local\ltiadvantage\repository\published_resource_repository;
  38 use Packback\Lti1p3\LtiMessageLaunch;
  39 use Packback\Lti1p3\LtiServiceConnector;
  40
  41 require_once(__DIR__ . '/../../config.php');
  42 global $OUTPUT, $PAGE, $CFG;
  43 require_once($CFG->libdir . '/filelib.php');
  44
  45 $idtoken = optional_param('id_token', null, PARAM_RAW);
  46 $launchid = optional_param('launchid', null, PARAM_RAW);
  47
  48 if (!is_enabled_auth('lti')) {
  49     throw new moodle_exception('pluginnotenabled', 'auth', '', get_string('pluginname', 'auth_lti'));
  50 }
  51 if (!enrol_is_enabled('lti')) {
  52     throw new moodle_exception('enrolisdisabled', 'enrol_lti');
  53 }
  54 if (empty($idtoken) && empty($launchid)) {
  55     throw new coding_exception('Error: launch requires id_token');
  56 }
  57
  58 // First launch from the platform: get launch data and cache it in case the user's not authenticated.
  59 $sesscache = new launch_cache_session();
  60 $issdb = new issuer_database(new application_registration_repository(), new deployment_repository());
  61 $cookie = new lti_cookie();
  62 $serviceconnector = new LtiServiceConnector($sesscache, new http_client());
  63 if ($idtoken) {
  64     $messagelaunch = LtiMessageLaunch::new($issdb, $sesscache, $cookie, $serviceconnector)
  65         ->initialize($_POST);
  66 }
  67 if ($launchid) {
  68     $messagelaunch = LtiMessageLaunch::fromCache($launchid, $issdb, $sesscache, $cookie, $serviceconnector);
  69 }
  70 if (empty($messagelaunch)) {
  71     throw new moodle_exception('Bad launch. Deep linking launch data could not be found');
  72 }
  73
  74 // Authenticate the instructor.
  75 // Deep linking cannot use resource-specific provisioning modes, so it just uses a sensible 'existing accounts only' mode.
  76 $auth = get_auth_plugin('lti');
  77 $auth->complete_login(
  78     $messagelaunch->getLaunchData(),
  79     new moodle_url('/enrol/lti/launch_deeplink.php', ['launchid' => $messagelaunch->getLaunchId()]),
  80     auth_plugin_lti::PROVISIONING_MODE_PROMPT_EXISTING_ONLY
  81 );
  82
  83 require_login(null, false);
  84 global $USER, $CFG;
  85 $PAGE->set_context(context_system::instance());
  86 $url = new moodle_url('/enrol/lti/launch_deeplink.php');
  87 $PAGE->set_url($url);
  88 $PAGE->set_pagelayout('popup');
  89 $PAGE->set_title(get_string('opentool', 'enrol_lti'));
  90
  91 // Get all the published_resource view objects and render them for selection.
  92 global $USER;
  93 $resourcerepo = new published_resource_repository();
  94 $resources = $resourcerepo->find_all_for_user($USER->id);
  95 $renderer = $PAGE->get_renderer('enrol_lti');
  96
  97 echo $OUTPUT->header();
  98 echo $renderer->render_published_resource_selection_view($messagelaunch, $resources);
  99 echo $OUTPUT->footer();