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(http://www.moodlerooms.com) * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later * @author Chris Scribner */ define('NO_DEBUG_DISPLAY', true); define('NO_MOODLE_COOKIES', true); require_once(__DIR__ . "/../../config.php"); require_once($CFG->dirroot.'/mod/lti/locallib.php'); require_once($CFG->dirroot.'/mod/lti/servicelib.php'); // TODO: Switch to core oauthlib once implemented - MDL-30149. use mod_lti\service_exception_handler; use moodle\mod\lti as lti; use ltiservice_basicoutcomes\local\service\basicoutcomes; $rawbody = file_get_contents("php://input"); $logrequests = lti_should_log_request($rawbody); $errorhandler = new service_exception_handler($logrequests); // Register our own error handler so we can always send valid XML response. set_exception_handler(array($errorhandler, 'handle')); if ($logrequests) { lti_log_request($rawbody); } $ok = true; $type = null; $toolproxy = false; $consumerkey = lti\get_oauth_key_from_headers(null, array(basicoutcomes::SCOPE_BASIC_OUTCOMES)); if ($consumerkey === false) { throw new Exception('Missing or invalid consumer key or access token.'); } else if (is_string($consumerkey)) { $toolproxy = lti_get_tool_proxy_from_guid($consumerkey); if ($toolproxy !== false) { $secrets = array($toolproxy->secret); } else if (!empty($tool)) { $secrets = array($typeconfig['password']); } else { $secrets = lti_get_shared_secrets_by_key($consumerkey); } $sharedsecret = lti_verify_message($consumerkey, lti_get_shared_secrets_by_key($consumerkey), $rawbody); if ($sharedsecret === false) { throw new Exception('Message signature not valid'); } } // TODO MDL-46023 Replace this code with a call to the new library. $xml = simplexml_load_string($rawbody); if (!$xml) { throw new Exception('Invalid XML content'); } $body = $xml->imsx_POXBody; foreach ($body->children() as $child) { $messagetype = $child->getName(); } // We know more about the message, update error handler to send better errors. $errorhandler->set_message_id(lti_parse_message_id($xml)); $errorhandler->set_message_type($messagetype); switch ($messagetype) { case 'replaceResultRequest': $parsed = lti_parse_grade_replace_message($xml); $ltiinstance = $DB->get_record('lti', array('id' => $parsed->instanceid)); if (!lti_accepts_grades($ltiinstance)) { throw new Exception('Tool does not accept grades'); } lti_verify_sourcedid($ltiinstance, $parsed); lti_set_session_user($parsed->userid); $gradestatus = lti_update_grade($ltiinstance, $parsed->userid, $parsed->launchid, $parsed->gradeval); if (!$gradestatus) { throw new Exception('Grade replace response'); } $responsexml = lti_get_response_xml( 'success', 'Grade replace response', $parsed->messageid, 'replaceResultResponse' ); echo $responsexml->asXML(); break; case 'readResultRequest': $parsed = lti_parse_grade_read_message($xml); $ltiinstance = $DB->get_record('lti', array('id' => $parsed->instanceid)); if (!lti_accepts_grades($ltiinstance)) { throw new Exception('Tool does not accept grades'); } // Getting the grade requires the context is set. $context = context_course::instance($ltiinstance->course); $PAGE->set_context($context); lti_verify_sourcedid($ltiinstance, $parsed); $grade = lti_read_grade($ltiinstance, $parsed->userid); $responsexml = lti_get_response_xml( 'success', // Empty grade is also 'success'. 'Result read', $parsed->messageid, 'readResultResponse' ); $node = $responsexml->imsx_POXBody->readResultResponse; $node = $node->addChild('result')->addChild('resultScore'); $node->addChild('language', 'en'); $node->addChild('textString', isset($grade) ? $grade : ''); echo $responsexml->asXML(); break; case 'deleteResultRequest': $parsed = lti_parse_grade_delete_message($xml); $ltiinstance = $DB->get_record('lti', array('id' => $parsed->instanceid)); if (!lti_accepts_grades($ltiinstance)) { throw new Exception('Tool does not accept grades'); } lti_verify_sourcedid($ltiinstance, $parsed); lti_set_session_user($parsed->userid); $gradestatus = lti_delete_grade($ltiinstance, $parsed->userid); if (!$gradestatus) { throw new Exception('Grade delete request'); } $responsexml = lti_get_response_xml( 'success', 'Grade delete request', $parsed->messageid, 'deleteResultResponse' ); echo $responsexml->asXML(); break; default: // Fire an event if we get a web service request which we don't support directly. // This will allow others to extend the LTI services, which I expect to be a common // use case, at least until the spec matures. $data = new stdClass(); $data->body = $rawbody; $data->xml = $xml; $data->messageid = lti_parse_message_id($xml); $data->messagetype = $messagetype; $data->consumerkey = $consumerkey; $data->sharedsecret = $sharedsecret; $eventdata = array(); $eventdata['other'] = array(); $eventdata['other']['messageid'] = $data->messageid; $eventdata['other']['messagetype'] = $messagetype; $eventdata['other']['consumerkey'] = $consumerkey; // Before firing the event, allow subplugins a chance to handle. if (lti_extend_lti_services($data)) { break; } // If an event handler handles the web service, it should set this global to true // So this code knows whether to send an "operation not supported" or not. global $ltiwebservicehandled; $ltiwebservicehandled = false; try { $event = \mod_lti\event\unknown_service_api_called::create($eventdata); $event->set_message_data($data); $event->trigger(); } catch (Exception $e) { $ltiwebservicehandled = false; } if (!$ltiwebservicehandled) { $responsexml = lti_get_response_xml( 'unsupported', 'unsupported', lti_parse_message_id($xml), $messagetype ); echo $responsexml->asXML(); } break; }