Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * Handles LTI 1.3 resource link launches.

 *

 * See enrol/lti/launch_deeplink.php for deep linking launches.

 *

 * There are 2 pathways through this page:

 * 1. When first making a resource linking launch from the platform. The launch data is cached at this point, pending user

 * authentication, and the page is set such that the post-authentication redirect will return here.

 * 2. The post-authentication redirect. The launch data is fetched from the session launch cache, and the resource is displayed.

 *

 * @package    enrol_lti

 * @copyright  2021 Jake Dallimore <jrhdallimore@gmail.com>

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

use core\http_client;

use enrol_lti\local\ltiadvantage\lib\lti_cookie;

use enrol_lti\local\ltiadvantage\lib\issuer_database;

use enrol_lti\local\ltiadvantage\lib\launch_cache_session;

use enrol_lti\local\ltiadvantage\repository\application_registration_repository;

use enrol_lti\local\ltiadvantage\repository\context_repository;

use enrol_lti\local\ltiadvantage\repository\deployment_repository;

use enrol_lti\local\ltiadvantage\repository\legacy_consumer_repository;

use enrol_lti\local\ltiadvantage\repository\resource_link_repository;

use enrol_lti\local\ltiadvantage\repository\user_repository;

use enrol_lti\local\ltiadvantage\service\tool_launch_service;

use enrol_lti\local\ltiadvantage\utility\message_helper;

use Packback\Lti1p3\LtiMessageLaunch;

use Packback\Lti1p3\LtiServiceConnector;

require_once(__DIR__ . '/../../config.php');

global $CFG;

require_once($CFG->libdir . '/filelib.php');

$idtoken = optional_param('id_token', null, PARAM_RAW);

$launchid = optional_param('launchid', null, PARAM_RAW);

if (!is_enabled_auth('lti')) {

    throw new moodle_exception('pluginnotenabled', 'auth', '', get_string('pluginname', 'auth_lti'));

}

if (!enrol_is_enabled('lti')) {

    throw new moodle_exception('enrolisdisabled', 'enrol_lti');

}

if (empty($idtoken) && empty($launchid)) {

    throw new coding_exception('Error: launch requires id_token');

}

// Support caching the launch and retrieving it after the account binding process described in auth::complete_login().

$sesscache = new launch_cache_session();

$issdb = new issuer_database(new application_registration_repository(), new deployment_repository());

$cookie = new lti_cookie();

$serviceconnector = new LtiServiceConnector($sesscache, new http_client());

if ($idtoken) {

    $messagelaunch = LtiMessageLaunch::new($issdb, $sesscache, $cookie, $serviceconnector)

        ->initialize($_POST);

}

if ($launchid) {

    $messagelaunch = LtiMessageLaunch::fromCache($launchid, $issdb, $sesscache, $cookie, $serviceconnector);

}

if (empty($messagelaunch)) {

    throw new moodle_exception('Bad launch. Message launch data could not be found');

}

// Authenticate the platform user, which could be an instructor, an admin or a learner.

// Auth code needs to be told about consumer secrets for the purposes of migration, since these reside in enrol_lti.

$launchdata = $messagelaunch->getLaunchData();

if (!empty($launchdata['https://purl.imsglobal.org/spec/lti/claim/lti1p1']['oauth_consumer_key'])) {

    $legacyconsumerrepo = new legacy_consumer_repository();

    $legacyconsumersecrets = $legacyconsumerrepo->get_consumer_secrets(

        $launchdata['https://purl.imsglobal.org/spec/lti/claim/lti1p1']['oauth_consumer_key']

    );

}

// To authenticate, we need the resource's account provisioning mode for the given LTI role.

if (empty($launchdata['https://purl.imsglobal.org/spec/lti/claim/custom']['id'])) {

    throw new \moodle_exception('ltiadvlauncherror:missingid', 'enrol_lti');

}

$resourceuuid = $launchdata['https://purl.imsglobal.org/spec/lti/claim/custom']['id'];

$resource = array_values(\enrol_lti\helper::get_lti_tools(['uuid' => $resourceuuid]));

$resource = $resource[0] ?? null;

if (empty($resource) || $resource->status != ENROL_INSTANCE_ENABLED) {

    throw new \moodle_exception('ltiadvlauncherror:invalidid', 'enrol_lti', '', $resourceuuid);

}

$provisioningmode = message_helper::is_instructor_launch($launchdata) ? $resource->provisioningmodeinstructor

    : $resource->provisioningmodelearner;

$auth = get_auth_plugin('lti');

$auth->complete_login(

    $messagelaunch->getLaunchData(),

    new moodle_url('/enrol/lti/launch.php', ['launchid' => $messagelaunch->getLaunchId()]),

    $provisioningmode,

    $legacyconsumersecrets ?? []

);

global $USER, $CFG, $PAGE;

// Page URL must be set before the require_login check, so that things like policies can redirect back with the launchid.

$PAGE->set_url(new moodle_url('/enrol/lti/launch.php'), ['launchid' => $messagelaunch->getLaunchId()]);

require_login(null, false);

$PAGE->set_context(context_system::instance());

$PAGE->set_pagelayout('popup'); // Same layout as the tool.php page in Legacy 1.1/2.0 launches.

$PAGE->set_title(get_string('opentool', 'enrol_lti'));

$toollaunchservice = new tool_launch_service(

    new deployment_repository(),

    new application_registration_repository(),

    new resource_link_repository(),

    new user_repository(),

    new context_repository()

);

[$userid, $resource] = $toollaunchservice->user_launches_tool($USER, $messagelaunch);

$context = context::instance_by_id($resource->contextid);

if ($context->contextlevel == CONTEXT_COURSE) {

    $courseid = $context->instanceid;

    $redirecturl = new moodle_url('/course/view.php', ['id' => $courseid]);

} else if ($context->contextlevel == CONTEXT_MODULE) {

    $cm = get_coursemodule_from_id(false, $context->instanceid, 0, false, MUST_EXIST);

    $redirecturl = new moodle_url('/mod/' . $cm->modname . '/view.php', ['id' => $cm->id]);

} else {

    throw new moodle_exception('invalidcontext');

}

if (empty($CFG->allowframembedding)) {

    $stropentool = get_string('opentool', 'enrol_lti');

    echo html_writer::tag('p', get_string('frameembeddingnotenabled', 'enrol_lti'));

    echo html_writer::link($redirecturl, $stropentool, ['target' => '_blank']);

} else {

    redirect($redirecturl);

}