.
//
// This file is part of BasicLTI4Moodle
//
// BasicLTI4Moodle is an IMS BasicLTI (Basic Learning Tools for Interoperability)
// consumer for Moodle 1.9 and Moodle 2.0. BasicLTI is a IMS Standard that allows web
// based learning tools to be easily integrated in LMS as native ones. The IMS BasicLTI
// specification is part of the IMS standard Common Cartridge 1.1 Sakai and other main LMS
// are already supporting or going to support BasicLTI. This project Implements the consumer
// for Moodle. Moodle is a Free Open source Learning Management System by Martin Dougiamas.
// BasicLTI4Moodle is a project iniciated and leaded by Ludo(Marc Alier) and Jordi Piguillem
// at the GESSI research group at UPC.
// SimpleLTI consumer for Moodle is an implementation of the early specification of LTI
// by Charles Severance (Dr Chuck) htp://dr-chuck.com , developed by Jordi Piguillem in a
// Google Summer of Code 2008 project co-mentored by Charles Severance and Marc Alier.
//
// BasicLTI4Moodle is copyright 2009 by Marc Alier Forment, Jordi Piguillem and Nikolas Galanis
// of the Universitat Politecnica de Catalunya http://www.upc.edu
// Contact info: Marc Alier Forment granludo @ gmail.com or marc.alier @ upc.edu.
/**
* This file contains the library of functions and constants for the lti module
*
* @package mod_lti
* @copyright 2009 Marc Alier, Jordi Piguillem, Nikolas Galanis
* marc.alier@upc.edu
* @copyright 2009 Universitat Politecnica de Catalunya http://www.upc.edu
* @author Marc Alier
* @author Jordi Piguillem
* @author Nikolas Galanis
* @author Chris Scribner
* @copyright 2015 Vital Source Technologies http://vitalsource.com
* @author Stephen Vickers
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die;
// TODO: Switch to core oauthlib once implemented - MDL-30149.
use moodle\mod\lti as lti;
use Firebase\JWT\JWT as JWT;
global $CFG;
require_once($CFG->dirroot.'/mod/lti/OAuth.php');
require_once($CFG->libdir.'/weblib.php');
require_once($CFG->dirroot . '/course/modlib.php');
require_once($CFG->dirroot . '/mod/lti/TrivialStore.php');
define('LTI_URL_DOMAIN_REGEX', '/(?:https?:\/\/)?(?:www\.)?([^\/]+)(?:\/|$)/i');
define('LTI_LAUNCH_CONTAINER_DEFAULT', 1);
define('LTI_LAUNCH_CONTAINER_EMBED', 2);
define('LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS', 3);
define('LTI_LAUNCH_CONTAINER_WINDOW', 4);
define('LTI_LAUNCH_CONTAINER_REPLACE_MOODLE_WINDOW', 5);
define('LTI_TOOL_STATE_ANY', 0);
define('LTI_TOOL_STATE_CONFIGURED', 1);
define('LTI_TOOL_STATE_PENDING', 2);
define('LTI_TOOL_STATE_REJECTED', 3);
define('LTI_TOOL_PROXY_TAB', 4);
define('LTI_TOOL_PROXY_STATE_CONFIGURED', 1);
define('LTI_TOOL_PROXY_STATE_PENDING', 2);
define('LTI_TOOL_PROXY_STATE_ACCEPTED', 3);
define('LTI_TOOL_PROXY_STATE_REJECTED', 4);
define('LTI_SETTING_NEVER', 0);
define('LTI_SETTING_ALWAYS', 1);
define('LTI_SETTING_DELEGATE', 2);
define('LTI_COURSEVISIBLE_NO', 0);
define('LTI_COURSEVISIBLE_PRECONFIGURED', 1);
define('LTI_COURSEVISIBLE_ACTIVITYCHOOSER', 2);
define('LTI_VERSION_1', 'LTI-1p0');
define('LTI_VERSION_2', 'LTI-2p0');
define('LTI_VERSION_1P3', '1.3.0');
define('LTI_ACCESS_TOKEN_LIFE', 3600);
// Standard prefix for JWT claims.
define('LTI_JWT_CLAIM_PREFIX', 'https://purl.imsglobal.org/spec/lti');
/**
* Return the mapping for standard message types to JWT message_type claim.
*
* @return array
*/
function lti_get_jwt_message_type_mapping() {
return array(
'basic-lti-launch-request' => 'LtiResourceLinkRequest',
'ContentItemSelectionRequest' => 'LtiDeepLinkingRequest',
'LtiDeepLinkingResponse' => 'ContentItemSelection',
);
}
/**
* Return the mapping for standard message parameters to JWT claim.
*
* @return array
*/
function lti_get_jwt_claim_mapping() {
return array(
'accept_copy_advice' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'accept_copy_advice',
'isarray' => false
],
'accept_media_types' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'accept_media_types',
'isarray' => true
],
'accept_multiple' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'accept_multiple',
'isarray' => false
],
'accept_presentation_document_targets' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'accept_presentation_document_targets',
'isarray' => true
],
'accept_types' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'accept_types',
'isarray' => true
],
'accept_unsigned' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'accept_unsigned',
'isarray' => false
],
'auto_create' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'auto_create',
'isarray' => false
],
'can_confirm' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'can_confirm',
'isarray' => false
],
'content_item_return_url' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'deep_link_return_url',
'isarray' => false
],
'content_items' => [
'suffix' => 'dl',
'group' => '',
'claim' => 'content_items',
'isarray' => true
],
'data' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'data',
'isarray' => false
],
'text' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'text',
'isarray' => false
],
'title' => [
'suffix' => 'dl',
'group' => 'deep_linking_settings',
'claim' => 'title',
'isarray' => false
],
'lti_msg' => [
'suffix' => 'dl',
'group' => '',
'claim' => 'msg',
'isarray' => false
],
'lti_log' => [
'suffix' => 'dl',
'group' => '',
'claim' => 'log',
'isarray' => false
],
'lti_errormsg' => [
'suffix' => 'dl',
'group' => '',
'claim' => 'errormsg',
'isarray' => false
],
'lti_errorlog' => [
'suffix' => 'dl',
'group' => '',
'claim' => 'errorlog',
'isarray' => false
],
'context_id' => [
'suffix' => '',
'group' => 'context',
'claim' => 'id',
'isarray' => false
],
'context_label' => [
'suffix' => '',
'group' => 'context',
'claim' => 'label',
'isarray' => false
],
'context_title' => [
'suffix' => '',
'group' => 'context',
'claim' => 'title',
'isarray' => false
],
'context_type' => [
'suffix' => '',
'group' => 'context',
'claim' => 'type',
'isarray' => true
],
'lis_course_offering_sourcedid' => [
'suffix' => '',
'group' => 'lis',
'claim' => 'course_offering_sourcedid',
'isarray' => false
],
'lis_course_section_sourcedid' => [
'suffix' => '',
'group' => 'lis',
'claim' => 'course_section_sourcedid',
'isarray' => false
],
'launch_presentation_css_url' => [
'suffix' => '',
'group' => 'launch_presentation',
'claim' => 'css_url',
'isarray' => false
],
'launch_presentation_document_target' => [
'suffix' => '',
'group' => 'launch_presentation',
'claim' => 'document_target',
'isarray' => false
],
'launch_presentation_height' => [
'suffix' => '',
'group' => 'launch_presentation',
'claim' => 'height',
'isarray' => false
],
'launch_presentation_locale' => [
'suffix' => '',
'group' => 'launch_presentation',
'claim' => 'locale',
'isarray' => false
],
'launch_presentation_return_url' => [
'suffix' => '',
'group' => 'launch_presentation',
'claim' => 'return_url',
'isarray' => false
],
'launch_presentation_width' => [
'suffix' => '',
'group' => 'launch_presentation',
'claim' => 'width',
'isarray' => false
],
'lis_person_contact_email_primary' => [
'suffix' => '',
'group' => null,
'claim' => 'email',
'isarray' => false
],
'lis_person_name_family' => [
'suffix' => '',
'group' => null,
'claim' => 'family_name',
'isarray' => false
],
'lis_person_name_full' => [
'suffix' => '',
'group' => null,
'claim' => 'name',
'isarray' => false
],
'lis_person_name_given' => [
'suffix' => '',
'group' => null,
'claim' => 'given_name',
'isarray' => false
],
'lis_person_sourcedid' => [
'suffix' => '',
'group' => 'lis',
'claim' => 'person_sourcedid',
'isarray' => false
],
'user_id' => [
'suffix' => '',
'group' => null,
'claim' => 'sub',
'isarray' => false
],
'user_image' => [
'suffix' => '',
'group' => null,
'claim' => 'picture',
'isarray' => false
],
'roles' => [
'suffix' => '',
'group' => '',
'claim' => 'roles',
'isarray' => true
],
'role_scope_mentor' => [
'suffix' => '',
'group' => '',
'claim' => 'role_scope_mentor',
'isarray' => false
],
'deployment_id' => [
'suffix' => '',
'group' => '',
'claim' => 'deployment_id',
'isarray' => false
],
'lti_message_type' => [
'suffix' => '',
'group' => '',
'claim' => 'message_type',
'isarray' => false
],
'lti_version' => [
'suffix' => '',
'group' => '',
'claim' => 'version',
'isarray' => false
],
'resource_link_description' => [
'suffix' => '',
'group' => 'resource_link',
'claim' => 'description',
'isarray' => false
],
'resource_link_id' => [
'suffix' => '',
'group' => 'resource_link',
'claim' => 'id',
'isarray' => false
],
'resource_link_title' => [
'suffix' => '',
'group' => 'resource_link',
'claim' => 'title',
'isarray' => false
],
'tool_consumer_info_product_family_code' => [
'suffix' => '',
'group' => 'tool_platform',
'claim' => 'family_code',
'isarray' => false
],
'tool_consumer_info_version' => [
'suffix' => '',
'group' => 'tool_platform',
'claim' => 'version',
'isarray' => false
],
'tool_consumer_instance_contact_email' => [
'suffix' => '',
'group' => 'tool_platform',
'claim' => 'contact_email',
'isarray' => false
],
'tool_consumer_instance_description' => [
'suffix' => '',
'group' => 'tool_platform',
'claim' => 'description',
'isarray' => false
],
'tool_consumer_instance_guid' => [
'suffix' => '',
'group' => 'tool_platform',
'claim' => 'guid',
'isarray' => false
],
'tool_consumer_instance_name' => [
'suffix' => '',
'group' => 'tool_platform',
'claim' => 'name',
'isarray' => false
],
'tool_consumer_instance_url' => [
'suffix' => '',
'group' => 'tool_platform',
'claim' => 'url',
'isarray' => false
],
'custom_context_memberships_url' => [
'suffix' => 'nrps',
'group' => 'namesroleservice',
'claim' => 'context_memberships_url',
'isarray' => false
],
'custom_context_memberships_versions' => [
'suffix' => 'nrps',
'group' => 'namesroleservice',
'claim' => 'service_versions',
'isarray' => true
],
'custom_gradebookservices_scope' => [
'suffix' => 'ags',
'group' => 'endpoint',
'claim' => 'scope',
'isarray' => true
],
'custom_lineitems_url' => [
'suffix' => 'ags',
'group' => 'endpoint',
'claim' => 'lineitems',
'isarray' => false
],
'custom_lineitem_url' => [
'suffix' => 'ags',
'group' => 'endpoint',
'claim' => 'lineitem',
'isarray' => false
],
'custom_results_url' => [
'suffix' => 'ags',
'group' => 'endpoint',
'claim' => 'results',
'isarray' => false
],
'custom_result_url' => [
'suffix' => 'ags',
'group' => 'endpoint',
'claim' => 'result',
'isarray' => false
],
'custom_scores_url' => [
'suffix' => 'ags',
'group' => 'endpoint',
'claim' => 'scores',
'isarray' => false
],
'custom_score_url' => [
'suffix' => 'ags',
'group' => 'endpoint',
'claim' => 'score',
'isarray' => false
],
'lis_outcome_service_url' => [
'suffix' => 'bos',
'group' => 'basicoutcomesservice',
'claim' => 'lis_outcome_service_url',
'isarray' => false
],
'lis_result_sourcedid' => [
'suffix' => 'bos',
'group' => 'basicoutcomesservice',
'claim' => 'lis_result_sourcedid',
'isarray' => false
],
);
}
/**
* Return the launch data required for opening the external tool.
*
* @param stdClass $instance the external tool activity settings
* @param string $nonce the nonce value to use (applies to LTI 1.3 only)
* @return array the endpoint URL and parameters (including the signature)
* @since Moodle 3.0
*/
function lti_get_launch_data($instance, $nonce = '') {
global $PAGE, $CFG, $USER;
if (empty($instance->typeid)) {
$tool = lti_get_tool_by_url_match($instance->toolurl, $instance->course);
if ($tool) {
$typeid = $tool->id;
$ltiversion = $tool->ltiversion;
} else {
$tool = lti_get_tool_by_url_match($instance->securetoolurl, $instance->course);
if ($tool) {
$typeid = $tool->id;
$ltiversion = $tool->ltiversion;
} else {
$typeid = null;
$ltiversion = LTI_VERSION_1;
}
}
} else {
$typeid = $instance->typeid;
$tool = lti_get_type($typeid);
$ltiversion = $tool->ltiversion;
}
if ($typeid) {
$typeconfig = lti_get_type_config($typeid);
} else {
// There is no admin configuration for this tool. Use configuration in the lti instance record plus some defaults.
$typeconfig = (array)$instance;
$typeconfig['sendname'] = $instance->instructorchoicesendname;
$typeconfig['sendemailaddr'] = $instance->instructorchoicesendemailaddr;
$typeconfig['customparameters'] = $instance->instructorcustomparameters;
$typeconfig['acceptgrades'] = $instance->instructorchoiceacceptgrades;
$typeconfig['allowroster'] = $instance->instructorchoiceallowroster;
$typeconfig['forcessl'] = '0';
}
// Default the organizationid if not specified.
if (empty($typeconfig['organizationid'])) {
$urlparts = parse_url($CFG->wwwroot);
$typeconfig['organizationid'] = $urlparts['host'];
}
if (isset($tool->toolproxyid)) {
$toolproxy = lti_get_tool_proxy($tool->toolproxyid);
$key = $toolproxy->guid;
$secret = $toolproxy->secret;
} else {
$toolproxy = null;
if (!empty($instance->resourcekey)) {
$key = $instance->resourcekey;
} else if ($ltiversion === LTI_VERSION_1P3) {
$key = $tool->clientid;
} else if (!empty($typeconfig['resourcekey'])) {
$key = $typeconfig['resourcekey'];
} else {
$key = '';
}
if (!empty($instance->password)) {
$secret = $instance->password;
} else if (!empty($typeconfig['password'])) {
$secret = $typeconfig['password'];
} else {
$secret = '';
}
}
$endpoint = !empty($instance->toolurl) ? $instance->toolurl : $typeconfig['toolurl'];
$endpoint = trim($endpoint);
// If the current request is using SSL and a secure tool URL is specified, use it.
if (lti_request_is_using_ssl() && !empty($instance->securetoolurl)) {
$endpoint = trim($instance->securetoolurl);
}
// If SSL is forced, use the secure tool url if specified. Otherwise, make sure https is on the normal launch URL.
if (isset($typeconfig['forcessl']) && ($typeconfig['forcessl'] == '1')) {
if (!empty($instance->securetoolurl)) {
$endpoint = trim($instance->securetoolurl);
}
$endpoint = lti_ensure_url_is_https($endpoint);
} else {
if (!strstr($endpoint, '://')) {
$endpoint = 'http://' . $endpoint;
}
}
$orgid = $typeconfig['organizationid'];
$course = $PAGE->course;
$islti2 = isset($tool->toolproxyid);
$allparams = lti_build_request($instance, $typeconfig, $course, $typeid, $islti2);
if ($islti2) {
$requestparams = lti_build_request_lti2($tool, $allparams);
} else {
$requestparams = $allparams;
}
$requestparams = array_merge($requestparams, lti_build_standard_message($instance, $orgid, $ltiversion));
$customstr = '';
if (isset($typeconfig['customparameters'])) {
$customstr = $typeconfig['customparameters'];
}
$requestparams = array_merge($requestparams, lti_build_custom_parameters($toolproxy, $tool, $instance, $allparams, $customstr,
$instance->instructorcustomparameters, $islti2));
$launchcontainer = lti_get_launch_container($instance, $typeconfig);
$returnurlparams = array('course' => $course->id,
'launch_container' => $launchcontainer,
'instanceid' => $instance->id,
'sesskey' => sesskey());
// Add the return URL. We send the launch container along to help us avoid frames-within-frames when the user returns.
$url = new \moodle_url('/mod/lti/return.php', $returnurlparams);
$returnurl = $url->out(false);
if (isset($typeconfig['forcessl']) && ($typeconfig['forcessl'] == '1')) {
$returnurl = lti_ensure_url_is_https($returnurl);
}
$target = '';
switch($launchcontainer) {
case LTI_LAUNCH_CONTAINER_EMBED:
case LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS:
$target = 'iframe';
break;
case LTI_LAUNCH_CONTAINER_REPLACE_MOODLE_WINDOW:
$target = 'frame';
break;
case LTI_LAUNCH_CONTAINER_WINDOW:
$target = 'window';
break;
}
if (!empty($target)) {
$requestparams['launch_presentation_document_target'] = $target;
}
$requestparams['launch_presentation_return_url'] = $returnurl;
// Add the parameters configured by the LTI services.
if ($typeid && !$islti2) {
$services = lti_get_services();
foreach ($services as $service) {
$serviceparameters = $service->get_launch_parameters('basic-lti-launch-request',
$course->id, $USER->id , $typeid, $instance->id);
foreach ($serviceparameters as $paramkey => $paramvalue) {
$requestparams['custom_' . $paramkey] = lti_parse_custom_parameter($toolproxy, $tool, $requestparams, $paramvalue,
$islti2);
}
}
}
// Allow request params to be updated by sub-plugins.
$plugins = core_component::get_plugin_list('ltisource');
foreach (array_keys($plugins) as $plugin) {
$pluginparams = component_callback('ltisource_'.$plugin, 'before_launch',
array($instance, $endpoint, $requestparams), array());
if (!empty($pluginparams) && is_array($pluginparams)) {
$requestparams = array_merge($requestparams, $pluginparams);
}
}
if ((!empty($key) && !empty($secret)) || ($ltiversion === LTI_VERSION_1P3)) {
if ($ltiversion !== LTI_VERSION_1P3) {
$parms = lti_sign_parameters($requestparams, $endpoint, 'POST', $key, $secret);
} else {
$parms = lti_sign_jwt($requestparams, $endpoint, $key, $typeid, $nonce);
}
$endpointurl = new \moodle_url($endpoint);
$endpointparams = $endpointurl->params();
// Strip querystring params in endpoint url from $parms to avoid duplication.
if (!empty($endpointparams) && !empty($parms)) {
foreach (array_keys($endpointparams) as $paramname) {
if (isset($parms[$paramname])) {
unset($parms[$paramname]);
}
}
}
} else {
// If no key and secret, do the launch unsigned.
$returnurlparams['unsigned'] = '1';
$parms = $requestparams;
}
return array($endpoint, $parms);
}
/**
* Launch an external tool activity.
*
* @param stdClass $instance the external tool activity settings
* @return string The HTML code containing the javascript code for the launch
*/
function lti_launch_tool($instance) {
list($endpoint, $parms) = lti_get_launch_data($instance);
$debuglaunch = ( $instance->debuglaunch == 1 );
$content = lti_post_launch_html($parms, $endpoint, $debuglaunch);
echo $content;
}
/**
* Prepares an LTI registration request message
*
* @param object $toolproxy Tool Proxy instance object
*/
function lti_register($toolproxy) {
$endpoint = $toolproxy->regurl;
// Change the status to pending.
$toolproxy->state = LTI_TOOL_PROXY_STATE_PENDING;
lti_update_tool_proxy($toolproxy);
$requestparams = lti_build_registration_request($toolproxy);
$content = lti_post_launch_html($requestparams, $endpoint, false);
echo $content;
}
/**
* Gets the parameters for the regirstration request
*
* @param object $toolproxy Tool Proxy instance object
* @return array Registration request parameters
*/
function lti_build_registration_request($toolproxy) {
$key = $toolproxy->guid;
$secret = $toolproxy->secret;
$requestparams = array();
$requestparams['lti_message_type'] = 'ToolProxyRegistrationRequest';
$requestparams['lti_version'] = 'LTI-2p0';
$requestparams['reg_key'] = $key;
$requestparams['reg_password'] = $secret;
$requestparams['reg_url'] = $toolproxy->regurl;
// Add the profile URL.
$profileservice = lti_get_service_by_name('profile');
$profileservice->set_tool_proxy($toolproxy);
$requestparams['tc_profile_url'] = $profileservice->parse_value('$ToolConsumerProfile.url');
// Add the return URL.
$returnurlparams = array('id' => $toolproxy->id, 'sesskey' => sesskey());
$url = new \moodle_url('/mod/lti/externalregistrationreturn.php', $returnurlparams);
$returnurl = $url->out(false);
$requestparams['launch_presentation_return_url'] = $returnurl;
return $requestparams;
}
/**
* Build source ID
*
* @param int $instanceid
* @param int $userid
* @param string $servicesalt
* @param null|int $typeid
* @param null|int $launchid
* @return stdClass
*/
function lti_build_sourcedid($instanceid, $userid, $servicesalt, $typeid = null, $launchid = null) {
$data = new \stdClass();
$data->instanceid = $instanceid;
$data->userid = $userid;
$data->typeid = $typeid;
if (!empty($launchid)) {
$data->launchid = $launchid;
} else {
$data->launchid = mt_rand();
}
$json = json_encode($data);
$hash = hash('sha256', $json . $servicesalt, false);
$container = new \stdClass();
$container->data = $data;
$container->hash = $hash;
return $container;
}
/**
* This function builds the request that must be sent to the tool producer
*
* @param object $instance Basic LTI instance object
* @param array $typeconfig Basic LTI tool configuration
* @param object $course Course object
* @param int|null $typeid Basic LTI tool ID
* @param boolean $islti2 True if an LTI 2 tool is being launched
*
* @return array Request details
*/
function lti_build_request($instance, $typeconfig, $course, $typeid = null, $islti2 = false) {
global $USER, $CFG;
if (empty($instance->cmid)) {
$instance->cmid = 0;
}
$role = lti_get_ims_role($USER, $instance->cmid, $instance->course, $islti2);
$requestparams = array(
'user_id' => $USER->id,
'lis_person_sourcedid' => $USER->idnumber,
'roles' => $role,
'context_id' => $course->id,
'context_label' => trim(html_to_text($course->shortname, 0)),
'context_title' => trim(html_to_text($course->fullname, 0)),
);
if (!empty($instance->name)) {
$requestparams['resource_link_title'] = trim(html_to_text($instance->name, 0));
}
if (!empty($instance->cmid)) {
$intro = format_module_intro('lti', $instance, $instance->cmid);
$intro = trim(html_to_text($intro, 0, false));
// This may look weird, but this is required for new lines
// so we generate the same OAuth signature as the tool provider.
$intro = str_replace("\n", "\r\n", $intro);
$requestparams['resource_link_description'] = $intro;
}
if (!empty($instance->id)) {
$requestparams['resource_link_id'] = $instance->id;
}
if (!empty($instance->resource_link_id)) {
$requestparams['resource_link_id'] = $instance->resource_link_id;
}
if ($course->format == 'site') {
$requestparams['context_type'] = 'Group';
} else {
$requestparams['context_type'] = 'CourseSection';
$requestparams['lis_course_section_sourcedid'] = $course->idnumber;
}
if (!empty($instance->id) && !empty($instance->servicesalt) && ($islti2 ||
$typeconfig['acceptgrades'] == LTI_SETTING_ALWAYS ||
($typeconfig['acceptgrades'] == LTI_SETTING_DELEGATE && $instance->instructorchoiceacceptgrades == LTI_SETTING_ALWAYS))
) {
$placementsecret = $instance->servicesalt;
$sourcedid = json_encode(lti_build_sourcedid($instance->id, $USER->id, $placementsecret, $typeid));
$requestparams['lis_result_sourcedid'] = $sourcedid;
// Add outcome service URL.
$serviceurl = new \moodle_url('/mod/lti/service.php');
$serviceurl = $serviceurl->out();
$forcessl = false;
if (!empty($CFG->mod_lti_forcessl)) {
$forcessl = true;
}
if ((isset($typeconfig['forcessl']) && ($typeconfig['forcessl'] == '1')) or $forcessl) {
$serviceurl = lti_ensure_url_is_https($serviceurl);
}
$requestparams['lis_outcome_service_url'] = $serviceurl;
}
// Send user's name and email data if appropriate.
if ($islti2 || $typeconfig['sendname'] == LTI_SETTING_ALWAYS ||
($typeconfig['sendname'] == LTI_SETTING_DELEGATE && isset($instance->instructorchoicesendname)
&& $instance->instructorchoicesendname == LTI_SETTING_ALWAYS)
) {
$requestparams['lis_person_name_given'] = $USER->firstname;
$requestparams['lis_person_name_family'] = $USER->lastname;
$requestparams['lis_person_name_full'] = fullname($USER);
$requestparams['ext_user_username'] = $USER->username;
}
if ($islti2 || $typeconfig['sendemailaddr'] == LTI_SETTING_ALWAYS ||
($typeconfig['sendemailaddr'] == LTI_SETTING_DELEGATE && isset($instance->instructorchoicesendemailaddr)
&& $instance->instructorchoicesendemailaddr == LTI_SETTING_ALWAYS)
) {
$requestparams['lis_person_contact_email_primary'] = $USER->email;
}
return $requestparams;
}
/**
* This function builds the request that must be sent to an LTI 2 tool provider
*
* @param object $tool Basic LTI tool object
* @param array $params Custom launch parameters
*
* @return array Request details
*/
function lti_build_request_lti2($tool, $params) {
$requestparams = array();
$capabilities = lti_get_capabilities();
$enabledcapabilities = explode("\n", $tool->enabledcapability);
foreach ($enabledcapabilities as $capability) {
if (array_key_exists($capability, $capabilities)) {
$val = $capabilities[$capability];
if ($val && (substr($val, 0, 1) != '$')) {
if (isset($params[$val])) {
$requestparams[$capabilities[$capability]] = $params[$capabilities[$capability]];
}
}
}
}
return $requestparams;
}
/**
* This function builds the standard parameters for an LTI 1 or 2 request that must be sent to the tool producer
*
* @param stdClass $instance Basic LTI instance object
* @param string $orgid Organisation ID
* @param boolean $islti2 True if an LTI 2 tool is being launched
* @param string $messagetype The request message type. Defaults to basic-lti-launch-request if empty.
*
* @return array Request details
* @deprecated since Moodle 3.7 MDL-62599 - please do not use this function any more.
* @see lti_build_standard_message()
*/
function lti_build_standard_request($instance, $orgid, $islti2, $messagetype = 'basic-lti-launch-request') {
if (!$islti2) {
$ltiversion = LTI_VERSION_1;
} else {
$ltiversion = LTI_VERSION_2;
}
return lti_build_standard_message($instance, $orgid, $ltiversion, $messagetype);
}
/**
* This function builds the standard parameters for an LTI message that must be sent to the tool producer
*
* @param stdClass $instance Basic LTI instance object
* @param string $orgid Organisation ID
* @param boolean $ltiversion LTI version to be used for tool messages
* @param string $messagetype The request message type. Defaults to basic-lti-launch-request if empty.
*
* @return array Message parameters
*/
function lti_build_standard_message($instance, $orgid, $ltiversion, $messagetype = 'basic-lti-launch-request') {
global $CFG;
$requestparams = array();
if ($instance) {
$requestparams['resource_link_id'] = $instance->id;
if (property_exists($instance, 'resource_link_id') and !empty($instance->resource_link_id)) {
$requestparams['resource_link_id'] = $instance->resource_link_id;
}
}
$requestparams['launch_presentation_locale'] = current_language();
// Make sure we let the tool know what LMS they are being called from.
$requestparams['ext_lms'] = 'moodle-2';
$requestparams['tool_consumer_info_product_family_code'] = 'moodle';
$requestparams['tool_consumer_info_version'] = strval($CFG->version);
// Add oauth_callback to be compliant with the 1.0A spec.
$requestparams['oauth_callback'] = 'about:blank';
$requestparams['lti_version'] = $ltiversion;
$requestparams['lti_message_type'] = $messagetype;
if ($orgid) {
$requestparams["tool_consumer_instance_guid"] = $orgid;
}
if (!empty($CFG->mod_lti_institution_name)) {
$requestparams['tool_consumer_instance_name'] = trim(html_to_text($CFG->mod_lti_institution_name, 0));
} else {
$requestparams['tool_consumer_instance_name'] = get_site()->shortname;
}
$requestparams['tool_consumer_instance_description'] = trim(html_to_text(get_site()->fullname, 0));
return $requestparams;
}
/**
* This function builds the custom parameters
*
* @param object $toolproxy Tool proxy instance object
* @param object $tool Tool instance object
* @param object $instance Tool placement instance object
* @param array $params LTI launch parameters
* @param string $customstr Custom parameters defined for tool
* @param string $instructorcustomstr Custom parameters defined for this placement
* @param boolean $islti2 True if an LTI 2 tool is being launched
*
* @return array Custom parameters
*/
function lti_build_custom_parameters($toolproxy, $tool, $instance, $params, $customstr, $instructorcustomstr, $islti2) {
// Concatenate the custom parameters from the administrator and the instructor
// Instructor parameters are only taken into consideration if the administrator
// has given permission.
$custom = array();
if ($customstr) {
$custom = lti_split_custom_parameters($toolproxy, $tool, $params, $customstr, $islti2);
}
if ($instructorcustomstr) {
$custom = array_merge(lti_split_custom_parameters($toolproxy, $tool, $params,
$instructorcustomstr, $islti2), $custom);
}
if ($islti2) {
$custom = array_merge(lti_split_custom_parameters($toolproxy, $tool, $params,
$tool->parameter, true), $custom);
$settings = lti_get_tool_settings($tool->toolproxyid);
$custom = array_merge($custom, lti_get_custom_parameters($toolproxy, $tool, $params, $settings));
if (!empty($instance->course)) {
$settings = lti_get_tool_settings($tool->toolproxyid, $instance->course);
$custom = array_merge($custom, lti_get_custom_parameters($toolproxy, $tool, $params, $settings));
if (!empty($instance->id)) {
$settings = lti_get_tool_settings($tool->toolproxyid, $instance->course, $instance->id);
$custom = array_merge($custom, lti_get_custom_parameters($toolproxy, $tool, $params, $settings));
}
}
}
return $custom;
}
/**
* Builds a standard LTI Content-Item selection request.
*
* @param int $id The tool type ID.
* @param stdClass $course The course object.
* @param moodle_url $returnurl The return URL in the tool consumer (TC) that the tool provider (TP)
* will use to return the Content-Item message.
* @param string $title The tool's title, if available.
* @param string $text The text to display to represent the content item. This value may be a long description of the content item.
* @param array $mediatypes Array of MIME types types supported by the TC. If empty, the TC will support ltilink by default.
* @param array $presentationtargets Array of ways in which the selected content item(s) can be requested to be opened
* (via the presentationDocumentTarget element for a returned content item).
* If empty, "frame", "iframe", and "window" will be supported by default.
* @param bool $autocreate Indicates whether any content items returned by the TP would be automatically persisted without
* @param bool $multiple Indicates whether the user should be permitted to select more than one item. False by default.
* any option for the user to cancel the operation. False by default.
* @param bool $unsigned Indicates whether the TC is willing to accept an unsigned return message, or not.
* A signed message should always be required when the content item is being created automatically in the
* TC without further interaction from the user. False by default.
* @param bool $canconfirm Flag for can_confirm parameter. False by default.
* @param bool $copyadvice Indicates whether the TC is able and willing to make a local copy of a content item. False by default.
* @param string $nonce
* @return stdClass The object containing the signed request parameters and the URL to the TP's Content-Item selection interface.
* @throws moodle_exception When the LTI tool type does not exist.`
* @throws coding_exception For invalid media type and presentation target parameters.
*/
function lti_build_content_item_selection_request($id, $course, moodle_url $returnurl, $title = '', $text = '', $mediatypes = [],
$presentationtargets = [], $autocreate = false, $multiple = false,
$unsigned = false, $canconfirm = false, $copyadvice = false, $nonce = '') {
global $USER;
$tool = lti_get_type($id);
// Validate parameters.
if (!$tool) {
throw new moodle_exception('errortooltypenotfound', 'mod_lti');
}
if (!is_array($mediatypes)) {
throw new coding_exception('The list of accepted media types should be in an array');
}
if (!is_array($presentationtargets)) {
throw new coding_exception('The list of accepted presentation targets should be in an array');
}
// Check title. If empty, use the tool's name.
if (empty($title)) {
$title = $tool->name;
}
$typeconfig = lti_get_type_config($id);
$key = '';
$secret = '';
$islti2 = false;
$islti13 = false;
if (isset($tool->toolproxyid)) {
$islti2 = true;
$toolproxy = lti_get_tool_proxy($tool->toolproxyid);
$key = $toolproxy->guid;
$secret = $toolproxy->secret;
} else {
$islti13 = $tool->ltiversion === LTI_VERSION_1P3;
$toolproxy = null;
if ($islti13 && !empty($tool->clientid)) {
$key = $tool->clientid;
} else if (!$islti13 && !empty($typeconfig['resourcekey'])) {
$key = $typeconfig['resourcekey'];
}
if (!empty($typeconfig['password'])) {
$secret = $typeconfig['password'];
}
}
$tool->enabledcapability = '';
if (!empty($typeconfig['enabledcapability_ContentItemSelectionRequest'])) {
$tool->enabledcapability = $typeconfig['enabledcapability_ContentItemSelectionRequest'];
}
$tool->parameter = '';
if (!empty($typeconfig['parameter_ContentItemSelectionRequest'])) {
$tool->parameter = $typeconfig['parameter_ContentItemSelectionRequest'];
}
// Set the tool URL.
if (!empty($typeconfig['toolurl_ContentItemSelectionRequest'])) {
$toolurl = new moodle_url($typeconfig['toolurl_ContentItemSelectionRequest']);
} else {
$toolurl = new moodle_url($typeconfig['toolurl']);
}
// Check if SSL is forced.
if (!empty($typeconfig['forcessl'])) {
// Make sure the tool URL is set to https.
if (strtolower($toolurl->get_scheme()) === 'http') {
$toolurl->set_scheme('https');
}
// Make sure the return URL is set to https.
if (strtolower($returnurl->get_scheme()) === 'http') {
$returnurl->set_scheme('https');
}
}
$toolurlout = $toolurl->out(false);
// Get base request parameters.
$instance = new stdClass();
$instance->course = $course->id;
$requestparams = lti_build_request($instance, $typeconfig, $course, $id, $islti2);
// Get LTI2-specific request parameters and merge to the request parameters if applicable.
if ($islti2) {
$lti2params = lti_build_request_lti2($tool, $requestparams);
$requestparams = array_merge($requestparams, $lti2params);
}
// Get standard request parameters and merge to the request parameters.
$orgid = !empty($typeconfig['organizationid']) ? $typeconfig['organizationid'] : '';
$standardparams = lti_build_standard_message(null, $orgid, $tool->ltiversion, 'ContentItemSelectionRequest');
$requestparams = array_merge($requestparams, $standardparams);
// Get custom request parameters and merge to the request parameters.
$customstr = '';
if (!empty($typeconfig['customparameters'])) {
$customstr = $typeconfig['customparameters'];
}
$customparams = lti_build_custom_parameters($toolproxy, $tool, $instance, $requestparams, $customstr, '', $islti2);
$requestparams = array_merge($requestparams, $customparams);
// Add the parameters configured by the LTI services.
if ($id && !$islti2) {
$services = lti_get_services();
foreach ($services as $service) {
$serviceparameters = $service->get_launch_parameters('ContentItemSelectionRequest',
$course->id, $USER->id , $id);
foreach ($serviceparameters as $paramkey => $paramvalue) {
$requestparams['custom_' . $paramkey] = lti_parse_custom_parameter($toolproxy, $tool, $requestparams, $paramvalue,
$islti2);
}
}
}
// Allow request params to be updated by sub-plugins.
$plugins = core_component::get_plugin_list('ltisource');
foreach (array_keys($plugins) as $plugin) {
$pluginparams = component_callback('ltisource_' . $plugin, 'before_launch', [$instance, $toolurlout, $requestparams], []);
if (!empty($pluginparams) && is_array($pluginparams)) {
$requestparams = array_merge($requestparams, $pluginparams);
}
}
if (!$islti13) {
// Media types. Set to ltilink by default if empty.
if (empty($mediatypes)) {
$mediatypes = [
'application/vnd.ims.lti.v1.ltilink',
];
}
$requestparams['accept_media_types'] = implode(',', $mediatypes);
} else {
// Only LTI links are currently supported.
$requestparams['accept_types'] = 'ltiResourceLink';
}
// Presentation targets. Supports frame, iframe, window by default if empty.
if (empty($presentationtargets)) {
$presentationtargets = [
'frame',
'iframe',
'window',
];
}
$requestparams['accept_presentation_document_targets'] = implode(',', $presentationtargets);
// Other request parameters.
$requestparams['accept_copy_advice'] = $copyadvice === true ? 'true' : 'false';
$requestparams['accept_multiple'] = $multiple === true ? 'true' : 'false';
$requestparams['accept_unsigned'] = $unsigned === true ? 'true' : 'false';
$requestparams['auto_create'] = $autocreate === true ? 'true' : 'false';
$requestparams['can_confirm'] = $canconfirm === true ? 'true' : 'false';
$requestparams['content_item_return_url'] = $returnurl->out(false);
$requestparams['title'] = $title;
$requestparams['text'] = $text;
if (!$islti13) {
$signedparams = lti_sign_parameters($requestparams, $toolurlout, 'POST', $key, $secret);
} else {
$signedparams = lti_sign_jwt($requestparams, $toolurlout, $key, $id, $nonce);
}
$toolurlparams = $toolurl->params();
// Strip querystring params in endpoint url from $signedparams to avoid duplication.
if (!empty($toolurlparams) && !empty($signedparams)) {
foreach (array_keys($toolurlparams) as $paramname) {
if (isset($signedparams[$paramname])) {
unset($signedparams[$paramname]);
}
}
}
// Check for params that should not be passed. Unset if they are set.
$unwantedparams = [
'resource_link_id',
'resource_link_title',
'resource_link_description',
'launch_presentation_return_url',
'lis_result_sourcedid',
];
foreach ($unwantedparams as $param) {
if (isset($signedparams[$param])) {
unset($signedparams[$param]);
}
}
// Prepare result object.
$result = new stdClass();
$result->params = $signedparams;
$result->url = $toolurlout;
return $result;
}
/**
* Verifies the OAuth signature of an incoming message.
*
* @param int $typeid The tool type ID.
* @param string $consumerkey The consumer key.
* @return stdClass Tool type
* @throws moodle_exception
* @throws lti\OAuthException
*/
function lti_verify_oauth_signature($typeid, $consumerkey) {
$tool = lti_get_type($typeid);
// Validate parameters.
if (!$tool) {
throw new moodle_exception('errortooltypenotfound', 'mod_lti');
}
$typeconfig = lti_get_type_config($typeid);
if (isset($tool->toolproxyid)) {
$toolproxy = lti_get_tool_proxy($tool->toolproxyid);
$key = $toolproxy->guid;
$secret = $toolproxy->secret;
} else {
$toolproxy = null;
if (!empty($typeconfig['resourcekey'])) {
$key = $typeconfig['resourcekey'];
} else {
$key = '';
}
if (!empty($typeconfig['password'])) {
$secret = $typeconfig['password'];
} else {
$secret = '';
}
}
if ($consumerkey !== $key) {
throw new moodle_exception('errorincorrectconsumerkey', 'mod_lti');
}
$store = new lti\TrivialOAuthDataStore();
$store->add_consumer($key, $secret);
$server = new lti\OAuthServer($store);
$method = new lti\OAuthSignatureMethod_HMAC_SHA1();
$server->add_signature_method($method);
$request = lti\OAuthRequest::from_request();
try {
$server->verify_request($request);
} catch (lti\OAuthException $e) {
throw new lti\OAuthException("OAuth signature failed: " . $e->getMessage());
}
return $tool;
}
/**
* Verifies the JWT signature of an incoming message.
*
* @param int $typeid The tool type ID.
* @param string $consumerkey The consumer key.
* @param string $jwtparam JWT parameter value
*
* @return stdClass Tool type
* @throws moodle_exception
* @throws UnexpectedValueException Provided JWT was invalid
* @throws SignatureInvalidException Provided JWT was invalid because the signature verification failed
* @throws BeforeValidException Provided JWT is trying to be used before it's eligible as defined by 'nbf'
* @throws BeforeValidException Provided JWT is trying to be used before it's been created as defined by 'iat'
* @throws ExpiredException Provided JWT has since expired, as defined by the 'exp' claim
*/
function lti_verify_jwt_signature($typeid, $consumerkey, $jwtparam) {
$tool = lti_get_type($typeid);
// Validate parameters.
if (!$tool) {
throw new moodle_exception('errortooltypenotfound', 'mod_lti');
}
if (isset($tool->toolproxyid)) {
throw new moodle_exception('JWT security not supported with LTI 2');
}
$typeconfig = lti_get_type_config($typeid);
$key = $tool->clientid ?? '';
$publickey = $typeconfig['publickey'] ?? '';
if ($consumerkey !== $key) {
throw new moodle_exception('errorincorrectconsumerkey', 'mod_lti');
}
if (empty($publickey)) {
throw new moodle_exception('No public key configured');
}
JWT::decode($jwtparam, $publickey, array('RS256'));
return $tool;
}
/**
* Processes the tool provider's response to the ContentItemSelectionRequest and builds the configuration data from the
* selected content item. This configuration data can be then used when adding a tool into the course.
*
* @param int $typeid The tool type ID.
* @param string $messagetype The value for the lti_message_type parameter.
* @param string $ltiversion The value for the lti_version parameter.
* @param string $consumerkey The consumer key.
* @param string $contentitemsjson The JSON string for the content_items parameter.
* @return stdClass The array of module information objects.
* @throws moodle_exception
* @throws lti\OAuthException
*/
function lti_tool_configuration_from_content_item($typeid, $messagetype, $ltiversion, $consumerkey, $contentitemsjson) {
$tool = lti_get_type($typeid);
// Validate parameters.
if (!$tool) {
throw new moodle_exception('errortooltypenotfound', 'mod_lti');
}
// Check lti_message_type. Show debugging if it's not set to ContentItemSelection.
// No need to throw exceptions for now since lti_message_type does not seem to be used in this processing at the moment.
if ($messagetype !== 'ContentItemSelection') {
debugging("lti_message_type is invalid: {$messagetype}. It should be set to 'ContentItemSelection'.",
DEBUG_DEVELOPER);
}
// Check LTI versions from our side and the response's side. Show debugging if they don't match.
// No need to throw exceptions for now since LTI version does not seem to be used in this processing at the moment.
$expectedversion = $tool->ltiversion;
$islti2 = ($expectedversion === LTI_VERSION_2);
if ($ltiversion !== $expectedversion) {
debugging("lti_version from response does not match the tool's configuration. Tool: {$expectedversion}," .
" Response: {$ltiversion}", DEBUG_DEVELOPER);
}
$items = json_decode($contentitemsjson);
if (empty($items)) {
throw new moodle_exception('errorinvaliddata', 'mod_lti', '', $contentitemsjson);
}
if (!isset($items->{'@graph'}) || !is_array($items->{'@graph'}) || (count($items->{'@graph'}) > 1)) {
throw new moodle_exception('errorinvalidresponseformat', 'mod_lti');
}
$config = null;
if (!empty($items->{'@graph'})) {
$item = $items->{'@graph'}[0];
$typeconfig = lti_get_type_type_config($tool->id);
$config = new stdClass();
$config->name = '';
if (isset($item->title)) {
$config->name = $item->title;
}
if (empty($config->name)) {
$config->name = $tool->name;
}
if (isset($item->text)) {
$config->introeditor = [
'text' => $item->text,
'format' => FORMAT_PLAIN
];
}
if (isset($item->icon->{'@id'})) {
$iconurl = new moodle_url($item->icon->{'@id'});
// Assign item's icon URL to secureicon or icon depending on its scheme.
if (strtolower($iconurl->get_scheme()) === 'https') {
$config->secureicon = $iconurl->out(false);
} else {
$config->icon = $iconurl->out(false);
}
}
if (isset($item->url)) {
$url = new moodle_url($item->url);
$config->toolurl = $url->out(false);
$config->typeid = 0;
} else {
$config->typeid = $tool->id;
}
$config->instructorchoiceacceptgrades = LTI_SETTING_NEVER;
if (!$islti2 && isset($typeconfig->lti_acceptgrades)) {
$acceptgrades = $typeconfig->lti_acceptgrades;
if ($acceptgrades == LTI_SETTING_ALWAYS) {
// We create a line item regardless if the definition contains one or not.
$config->instructorchoiceacceptgrades = LTI_SETTING_ALWAYS;
}
if ($acceptgrades == LTI_SETTING_DELEGATE || $acceptgrades == LTI_SETTING_ALWAYS) {
if (isset($item->lineItem)) {
$lineitem = $item->lineItem;
$config->instructorchoiceacceptgrades = LTI_SETTING_ALWAYS;
$maxscore = 100;
if (isset($lineitem->scoreConstraints)) {
$sc = $lineitem->scoreConstraints;
if (isset($sc->totalMaximum)) {
$maxscore = $sc->totalMaximum;
} else if (isset($sc->normalMaximum)) {
$maxscore = $sc->normalMaximum;
}
}
$config->grade_modgrade_point = $maxscore;
if (isset($lineitem->assignedActivity) && isset($lineitem->assignedActivity->activityId)) {
$config->cmidnumber = $lineitem->assignedActivity->activityId;
}
}
}
}
$config->instructorchoicesendname = LTI_SETTING_NEVER;
$config->instructorchoicesendemailaddr = LTI_SETTING_NEVER;
$config->launchcontainer = LTI_LAUNCH_CONTAINER_DEFAULT;
if (isset($item->placementAdvice->presentationDocumentTarget)) {
if ($item->placementAdvice->presentationDocumentTarget === 'window') {
$config->launchcontainer = LTI_LAUNCH_CONTAINER_WINDOW;
} else if ($item->placementAdvice->presentationDocumentTarget === 'frame') {
$config->launchcontainer = LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS;
} else if ($item->placementAdvice->presentationDocumentTarget === 'iframe') {
$config->launchcontainer = LTI_LAUNCH_CONTAINER_EMBED;
}
}
if (isset($item->custom)) {
$customparameters = [];
foreach ($item->custom as $key => $value) {
$customparameters[] = "{$key}={$value}";
}
$config->instructorcustomparameters = implode("\n", $customparameters);
}
$config->contentitemjson = json_encode($item);
}
return $config;
}
/**
* Converts the new Deep-Linking format for Content-Items to the old format.
*
* @param string $param JSON string representing new Deep-Linking format
* @return string JSON representation of content-items
*/
function lti_convert_content_items($param) {
$items = array();
$json = json_decode($param);
if (!empty($json) && is_array($json)) {
foreach ($json as $item) {
if (isset($item->type)) {
$newitem = clone $item;
switch ($item->type) {
case 'ltiResourceLink':
$newitem->{'@type'} = 'LtiLinkItem';
$newitem->mediaType = 'application\/vnd.ims.lti.v1.ltilink';
break;
case 'link':
case 'rich':
$newitem->{'@type'} = 'ContentItem';
$newitem->mediaType = 'text/html';
break;
case 'file':
$newitem->{'@type'} = 'FileItem';
break;
}
unset($newitem->type);
if (isset($item->html)) {
$newitem->text = $item->html;
unset($newitem->html);
}
if (isset($item->presentation)) {
$newitem->placementAdvice = new stdClass();
if (isset($item->presentation->documentTarget)) {
$newitem->placementAdvice->presentationDocumentTarget = $item->presentation->documentTarget;
}
if (isset($item->presentation->windowTarget)) {
$newitem->placementAdvice->windowTarget = $item->presentation->windowTarget;
}
if (isset($item->presentation->width)) {
$newitem->placementAdvice->dislayWidth = $item->presentation->width;
}
if (isset($item->presentation->height)) {
$newitem->placementAdvice->dislayHeight = $item->presentation->height;
}
unset($newitem->presentation);
}
if (isset($item->icon) && isset($item->icon->url)) {
$newitem->icon->{'@id'} = $item->icon->url;
unset($newitem->icon->url);
}
if (isset($item->thumbnail) && isset($item->thumbnail->url)) {
$newitem->thumbnail->{'@id'} = $item->thumbnail->url;
unset($newitem->thumbnail->url);
}
if (isset($item->lineItem)) {
unset($newitem->lineItem);
$newitem->lineItem = new stdClass();
$newitem->lineItem->{'@type'} = 'LineItem';
$newitem->lineItem->reportingMethod = 'http://purl.imsglobal.org/ctx/lis/v2p1/Result#totalScore';
if (isset($item->lineItem->label)) {
$newitem->lineItem->label = $item->lineItem->label;
}
if (isset($item->lineItem->resourceId)) {
$newitem->lineItem->assignedActivity = new stdClass();
$newitem->lineItem->assignedActivity->activityId = $item->lineItem->resourceId;
}
if (isset($item->lineItem->scoreMaximum)) {
$newitem->lineItem->scoreConstraints = new stdClass();
$newitem->lineItem->scoreConstraints->{'@type'} = 'NumericLimits';
$newitem->lineItem->scoreConstraints->totalMaximum = $item->lineItem->scoreMaximum;
}
}
$items[] = $newitem;
}
}
}
$newitems = new stdClass();
$newitems->{'@context'} = 'http://purl.imsglobal.org/ctx/lti/v1/ContentItem';
$newitems->{'@graph'} = $items;
return json_encode($newitems);
}
function lti_get_tool_table($tools, $id) {
global $OUTPUT;
$html = '';
$typename = get_string('typename', 'lti');
$baseurl = get_string('baseurl', 'lti');
$action = get_string('action', 'lti');
$createdon = get_string('createdon', 'lti');
if (!empty($tools)) {
$html .= "
';
} else {
$html .= get_string('no_' . $id, 'lti');
}
return $html;
}
/**
* This function builds the tab for a category of tool proxies
*
* @param object $toolproxies Tool proxy instance objects
* @param string $id Category ID
*
* @return string HTML for tab
*/
function lti_get_tool_proxy_table($toolproxies, $id) {
global $OUTPUT;
if (!empty($toolproxies)) {
$typename = get_string('typename', 'lti');
$url = get_string('registrationurl', 'lti');
$action = get_string('action', 'lti');
$createdon = get_string('createdon', 'lti');
$html = <<< EOD
';
} else {
$html = get_string('no_' . $id, 'lti');
}
return $html;
}
/**
* Extracts the enabled capabilities into an array, including those implicitly declared in a parameter
*
* @param object $tool Tool instance object
*
* @return array List of enabled capabilities
*/
function lti_get_enabled_capabilities($tool) {
if (!isset($tool)) {
return array();
}
if (!empty($tool->enabledcapability)) {
$enabledcapabilities = explode("\n", $tool->enabledcapability);
} else {
$enabledcapabilities = array();
}
if (!empty($tool->parameter)) {
$paramstr = str_replace("\r\n", "\n", $tool->parameter);
$paramstr = str_replace("\n\r", "\n", $paramstr);
$paramstr = str_replace("\r", "\n", $paramstr);
$params = explode("\n", $paramstr);
foreach ($params as $param) {
$pos = strpos($param, '=');
if (($pos === false) || ($pos < 1)) {
continue;
}
$value = trim(core_text::substr($param, $pos + 1, strlen($param)));
if (substr($value, 0, 1) == '$') {
$value = substr($value, 1);
if (!in_array($value, $enabledcapabilities)) {
$enabledcapabilities[] = $value;
}
}
}
}
return $enabledcapabilities;
}
/**
* Splits the custom parameters field to the various parameters
*
* @param object $toolproxy Tool proxy instance object
* @param object $tool Tool instance object
* @param array $params LTI launch parameters
* @param string $customstr String containing the parameters
* @param boolean $islti2 True if an LTI 2 tool is being launched
*
* @return array of custom parameters
*/
function lti_split_custom_parameters($toolproxy, $tool, $params, $customstr, $islti2 = false) {
$customstr = str_replace("\r\n", "\n", $customstr);
$customstr = str_replace("\n\r", "\n", $customstr);
$customstr = str_replace("\r", "\n", $customstr);
$lines = explode("\n", $customstr); // Or should this split on "/[\n;]/"?
$retval = array();
foreach ($lines as $line) {
$pos = strpos($line, '=');
if ( $pos === false || $pos < 1 ) {
continue;
}
$key = trim(core_text::substr($line, 0, $pos));
$val = trim(core_text::substr($line, $pos + 1, strlen($line)));
$val = lti_parse_custom_parameter($toolproxy, $tool, $params, $val, $islti2);
$key2 = lti_map_keyname($key);
$retval['custom_'.$key2] = $val;
if (($islti2 || ($tool->ltiversion === LTI_VERSION_1P3)) && ($key != $key2)) {
$retval['custom_'.$key] = $val;
}
}
return $retval;
}
/**
* Adds the custom parameters to an array
*
* @param object $toolproxy Tool proxy instance object
* @param object $tool Tool instance object
* @param array $params LTI launch parameters
* @param array $parameters Array containing the parameters
*
* @return array Array of custom parameters
*/
function lti_get_custom_parameters($toolproxy, $tool, $params, $parameters) {
$retval = array();
foreach ($parameters as $key => $val) {
$key2 = lti_map_keyname($key);
$val = lti_parse_custom_parameter($toolproxy, $tool, $params, $val, true);
$retval['custom_'.$key2] = $val;
if ($key != $key2) {
$retval['custom_'.$key] = $val;
}
}
return $retval;
}
/**
* Parse a custom parameter to replace any substitution variables
*
* @param object $toolproxy Tool proxy instance object
* @param object $tool Tool instance object
* @param array $params LTI launch parameters
* @param string $value Custom parameter value
* @param boolean $islti2 True if an LTI 2 tool is being launched
*
* @return string Parsed value of custom parameter
*/
function lti_parse_custom_parameter($toolproxy, $tool, $params, $value, $islti2) {
// This is required as {${$valarr[0]}->{$valarr[1]}}" may be using the USER or COURSE var.
global $USER, $COURSE;
if ($value) {
if (substr($value, 0, 1) == '\\') {
$value = substr($value, 1);
} else if (substr($value, 0, 1) == '$') {
$value1 = substr($value, 1);
$enabledcapabilities = lti_get_enabled_capabilities($tool);
if (!$islti2 || in_array($value1, $enabledcapabilities)) {
$capabilities = lti_get_capabilities();
if (array_key_exists($value1, $capabilities)) {
$val = $capabilities[$value1];
if ($val) {
if (substr($val, 0, 1) != '$') {
$value = $params[$val];
} else {
$valarr = explode('->', substr($val, 1), 2);
$value = "{${$valarr[0]}->{$valarr[1]}}";
$value = str_replace('
' , ' ', $value);
$value = str_replace('
' , ' ', $value);
$value = format_string($value);
}
} else {
$value = lti_calculate_custom_parameter($value1);
}
} else {
$val = $value;
$services = lti_get_services();
foreach ($services as $service) {
$service->set_tool_proxy($toolproxy);
$service->set_type($tool);
$value = $service->parse_value($val);
if ($val != $value) {
break;
}
}
}
}
}
}
return $value;
}
/**
* Calculates the value of a custom parameter that has not been specified earlier
*
* @param string $value Custom parameter value
*
* @return string Calculated value of custom parameter
*/
function lti_calculate_custom_parameter($value) {
global $USER, $COURSE;
switch ($value) {
case 'Moodle.Person.userGroupIds':
return implode(",", groups_get_user_groups($COURSE->id, $USER->id)[0]);
}
return null;
}
/**
* Used for building the names of the different custom parameters
*
* @param string $key Parameter name
* @param bool $tolower Do we want to convert the key into lower case?
* @return string Processed name
*/
function lti_map_keyname($key, $tolower = true) {
if ($tolower) {
$newkey = '';
$key = core_text::strtolower(trim($key));
foreach (str_split($key) as $ch) {
if ( ($ch >= 'a' && $ch <= 'z') || ($ch >= '0' && $ch <= '9') ) {
$newkey .= $ch;
} else {
$newkey .= '_';
}
}
} else {
$newkey = $key;
}
return $newkey;
}
/**
* Gets the IMS role string for the specified user and LTI course module.
*
* @param mixed $user User object or user id
* @param int $cmid The course module id of the LTI activity
* @param int $courseid The course id of the LTI activity
* @param boolean $islti2 True if an LTI 2 tool is being launched
*
* @return string A role string suitable for passing with an LTI launch
*/
function lti_get_ims_role($user, $cmid, $courseid, $islti2) {
$roles = array();
if (empty($cmid)) {
// If no cmid is passed, check if the user is a teacher in the course
// This allows other modules to programmatically "fake" a launch without
// a real LTI instance.
$context = context_course::instance($courseid);
if (has_capability('moodle/course:manageactivities', $context, $user)) {
array_push($roles, 'Instructor');
} else {
array_push($roles, 'Learner');
}
} else {
$context = context_module::instance($cmid);
if (has_capability('mod/lti:manage', $context)) {
array_push($roles, 'Instructor');
} else {
array_push($roles, 'Learner');
}
}
if (is_siteadmin($user) || has_capability('mod/lti:admin', $context)) {
// Make sure admins do not have the Learner role, then set admin role.
$roles = array_diff($roles, array('Learner'));
if (!$islti2) {
array_push($roles, 'urn:lti:sysrole:ims/lis/Administrator', 'urn:lti:instrole:ims/lis/Administrator');
} else {
array_push($roles, 'http://purl.imsglobal.org/vocab/lis/v2/person#Administrator');
}
}
return join(',', $roles);
}
/**
* Returns configuration details for the tool
*
* @param int $typeid Basic LTI tool typeid
*
* @return array Tool Configuration
*/
function lti_get_type_config($typeid) {
global $DB;
$query = "SELECT name, value
FROM {lti_types_config}
WHERE typeid = :typeid1
UNION ALL
SELECT 'toolurl' AS name, baseurl AS value
FROM {lti_types}
WHERE id = :typeid2
UNION ALL
SELECT 'icon' AS name, icon AS value
FROM {lti_types}
WHERE id = :typeid3
UNION ALL
SELECT 'secureicon' AS name, secureicon AS value
FROM {lti_types}
WHERE id = :typeid4";
$typeconfig = array();
$configs = $DB->get_records_sql($query,
array('typeid1' => $typeid, 'typeid2' => $typeid, 'typeid3' => $typeid, 'typeid4' => $typeid));
if (!empty($configs)) {
foreach ($configs as $config) {
$typeconfig[$config->name] = $config->value;
}
}
return $typeconfig;
}
function lti_get_tools_by_url($url, $state, $courseid = null) {
$domain = lti_get_domain_from_url($url);
return lti_get_tools_by_domain($domain, $state, $courseid);
}
function lti_get_tools_by_domain($domain, $state = null, $courseid = null) {
global $DB, $SITE;
$statefilter = '';
$coursefilter = '';
if ($state) {
$statefilter = 'AND state = :state';
}
if ($courseid && $courseid != $SITE->id) {
$coursefilter = 'OR course = :courseid';
}
$query = "SELECT *
FROM {lti_types}
WHERE tooldomain = :tooldomain
AND (course = :siteid $coursefilter)
$statefilter";
return $DB->get_records_sql($query, array(
'courseid' => $courseid,
'siteid' => $SITE->id,
'tooldomain' => $domain,
'state' => $state
));
}
/**
* Returns all basicLTI tools configured by the administrator
*
* @param int $course
*
* @return array
*/
function lti_filter_get_types($course) {
global $DB;
if (!empty($course)) {
$where = "WHERE t.course = :course";
$params = array('course' => $course);
} else {
$where = '';
$params = array();
}
$query = "SELECT t.id, t.name, t.baseurl, t.state, t.toolproxyid, t.timecreated, tp.name tpname
FROM {lti_types} t LEFT OUTER JOIN {lti_tool_proxies} tp ON t.toolproxyid = tp.id
{$where}";
return $DB->get_records_sql($query, $params);
}
/**
* Given an array of tools, filter them based on their state
*
* @param array $tools An array of lti_types records
* @param int $state One of the LTI_TOOL_STATE_* constants
* @return array
*/
function lti_filter_tool_types(array $tools, $state) {
$return = array();
foreach ($tools as $key => $tool) {
if ($tool->state == $state) {
$return[$key] = $tool;
}
}
return $return;
}
/**
* Returns all lti types visible in this course
*
* @param int $courseid The id of the course to retieve types for
* @param array $coursevisible options for 'coursevisible' field,
* default [LTI_COURSEVISIBLE_PRECONFIGURED, LTI_COURSEVISIBLE_ACTIVITYCHOOSER]
* @return stdClass[] All the lti types visible in the given course
*/
function lti_get_lti_types_by_course($courseid, $coursevisible = null) {
global $DB, $SITE;
if ($coursevisible === null) {
$coursevisible = [LTI_COURSEVISIBLE_PRECONFIGURED, LTI_COURSEVISIBLE_ACTIVITYCHOOSER];
}
list($coursevisiblesql, $coursevisparams) = $DB->get_in_or_equal($coursevisible, SQL_PARAMS_NAMED, 'coursevisible');
$query = "SELECT *
FROM {lti_types}
WHERE coursevisible $coursevisiblesql
AND (course = :siteid OR course = :courseid)
AND state = :active";
return $DB->get_records_sql($query,
array('siteid' => $SITE->id, 'courseid' => $courseid, 'active' => LTI_TOOL_STATE_CONFIGURED) + $coursevisparams);
}
/**
* Returns tool types for lti add instance and edit page
*
* @return array Array of lti types
*/
function lti_get_types_for_add_instance() {
global $COURSE;
$admintypes = lti_get_lti_types_by_course($COURSE->id);
$types = array();
$types[0] = (object)array('name' => get_string('automatic', 'lti'), 'course' => 0, 'toolproxyid' => null);
foreach ($admintypes as $type) {
$types[$type->id] = $type;
}
return $types;
}
/**
* Returns a list of configured types in the given course
*
* @param int $courseid The id of the course to retieve types for
* @param int $sectionreturn section to return to for forming the URLs
* @return array Array of lti types. Each element is object with properties: name, title, icon, help, helplink, link
*/
function lti_get_configured_types($courseid, $sectionreturn = 0) {
global $OUTPUT;
$types = array();
$admintypes = lti_get_lti_types_by_course($courseid, [LTI_COURSEVISIBLE_ACTIVITYCHOOSER]);
foreach ($admintypes as $ltitype) {
$type = new stdClass();
$type->modclass = MOD_CLASS_ACTIVITY;
$type->name = 'lti_type_' . $ltitype->id;
// Clean the name. We don't want tags here.
$type->title = clean_param($ltitype->name, PARAM_NOTAGS);
$trimmeddescription = trim($ltitype->description);
if ($trimmeddescription != '') {
// Clean the description. We don't want tags here.
$type->help = clean_param($trimmeddescription, PARAM_NOTAGS);
$type->helplink = get_string('modulename_shortcut_link', 'lti');
}
if (empty($ltitype->icon)) {
$type->icon = $OUTPUT->pix_icon('icon', '', 'lti', array('class' => 'icon'));
} else {
$type->icon = html_writer::empty_tag('img', array('src' => $ltitype->icon, 'alt' => $ltitype->name, 'class' => 'icon'));
}
$type->link = new moodle_url('/course/modedit.php', array('add' => 'lti', 'return' => 0, 'course' => $courseid,
'sr' => $sectionreturn, 'typeid' => $ltitype->id));
$types[] = $type;
}
return $types;
}
function lti_get_domain_from_url($url) {
$matches = array();
if (preg_match(LTI_URL_DOMAIN_REGEX, $url, $matches)) {
return $matches[1];
}
}
function lti_get_tool_by_url_match($url, $courseid = null, $state = LTI_TOOL_STATE_CONFIGURED) {
$possibletools = lti_get_tools_by_url($url, $state, $courseid);
return lti_get_best_tool_by_url($url, $possibletools, $courseid);
}
function lti_get_url_thumbprint($url) {
// Parse URL requires a schema otherwise everything goes into 'path'. Fixed 5.4.7 or later.
if (preg_match('/https?:\/\//', $url) !== 1) {
$url = 'http://'.$url;
}
$urlparts = parse_url(strtolower($url));
if (!isset($urlparts['path'])) {
$urlparts['path'] = '';
}
if (!isset($urlparts['query'])) {
$urlparts['query'] = '';
}
if (!isset($urlparts['host'])) {
$urlparts['host'] = '';
}
if (substr($urlparts['host'], 0, 4) === 'www.') {
$urlparts['host'] = substr($urlparts['host'], 4);
}
$urllower = $urlparts['host'] . '/' . $urlparts['path'];
if ($urlparts['query'] != '') {
$urllower .= '?' . $urlparts['query'];
}
return $urllower;
}
function lti_get_best_tool_by_url($url, $tools, $courseid = null) {
if (count($tools) === 0) {
return null;
}
$urllower = lti_get_url_thumbprint($url);
foreach ($tools as $tool) {
$tool->_matchscore = 0;
$toolbaseurllower = lti_get_url_thumbprint($tool->baseurl);
if ($urllower === $toolbaseurllower) {
// 100 points for exact thumbprint match.
$tool->_matchscore += 100;
} else if (substr($urllower, 0, strlen($toolbaseurllower)) === $toolbaseurllower) {
// 50 points if tool thumbprint starts with the base URL thumbprint.
$tool->_matchscore += 50;
}
// Prefer course tools over site tools.
if (!empty($courseid)) {
// Minus 10 points for not matching the course id (global tools).
if ($tool->course != $courseid) {
$tool->_matchscore -= 10;
}
}
}
$bestmatch = array_reduce($tools, function($value, $tool) {
if ($tool->_matchscore > $value->_matchscore) {
return $tool;
} else {
return $value;
}
}, (object)array('_matchscore' => -1));
// None of the tools are suitable for this URL.
if ($bestmatch->_matchscore <= 0) {
return null;
}
return $bestmatch;
}
function lti_get_shared_secrets_by_key($key) {
global $DB;
// Look up the shared secret for the specified key in both the types_config table (for configured tools)
// And in the lti resource table for ad-hoc tools.
$lti13 = LTI_VERSION_1P3;
$query = "SELECT t2.value
FROM {lti_types_config} t1
JOIN {lti_types_config} t2 ON t1.typeid = t2.typeid
JOIN {lti_types} type ON t2.typeid = type.id
WHERE t1.name = 'resourcekey'
AND t1.value = :key1
AND t2.name = 'password'
AND type.state = :configured1
AND type.ltiversion <> :ltiversion
UNION
SELECT tp.secret AS value
FROM {lti_tool_proxies} tp
JOIN {lti_types} t ON tp.id = t.toolproxyid
WHERE tp.guid = :key2
AND t.state = :configured2
UNION
SELECT password AS value
FROM {lti}
WHERE resourcekey = :key3";
$sharedsecrets = $DB->get_records_sql($query, array('configured1' => LTI_TOOL_STATE_CONFIGURED, 'ltiversion' => $lti13,
'configured2' => LTI_TOOL_STATE_CONFIGURED, 'key1' => $key, 'key2' => $key, 'key3' => $key));
$values = array_map(function($item) {
return $item->value;
}, $sharedsecrets);
// There should really only be one shared secret per key. But, we can't prevent
// more than one getting entered. For instance, if the same key is used for two tool providers.
return $values;
}
/**
* Delete a Basic LTI configuration
*
* @param int $id Configuration id
*/
function lti_delete_type($id) {
global $DB;
// We should probably just copy the launch URL to the tool instances in this case... using a single query.
/*
$instances = $DB->get_records('lti', array('typeid' => $id));
foreach ($instances as $instance) {
$instance->typeid = 0;
$DB->update_record('lti', $instance);
}*/
$DB->delete_records('lti_types', array('id' => $id));
$DB->delete_records('lti_types_config', array('typeid' => $id));
}
function lti_set_state_for_type($id, $state) {
global $DB;
$DB->update_record('lti_types', (object)array('id' => $id, 'state' => $state));
}
/**
* Transforms a basic LTI object to an array
*
* @param object $ltiobject Basic LTI object
*
* @return array Basic LTI configuration details
*/
function lti_get_config($ltiobject) {
$typeconfig = (array)$ltiobject;
$additionalconfig = lti_get_type_config($ltiobject->typeid);
$typeconfig = array_merge($typeconfig, $additionalconfig);
return $typeconfig;
}
/**
*
* Generates some of the tool configuration based on the instance details
*
* @param int $id
*
* @return object configuration
*
*/
function lti_get_type_config_from_instance($id) {
global $DB;
$instance = $DB->get_record('lti', array('id' => $id));
$config = lti_get_config($instance);
$type = new \stdClass();
$type->lti_fix = $id;
if (isset($config['toolurl'])) {
$type->lti_toolurl = $config['toolurl'];
}
if (isset($config['instructorchoicesendname'])) {
$type->lti_sendname = $config['instructorchoicesendname'];
}
if (isset($config['instructorchoicesendemailaddr'])) {
$type->lti_sendemailaddr = $config['instructorchoicesendemailaddr'];
}
if (isset($config['instructorchoiceacceptgrades'])) {
$type->lti_acceptgrades = $config['instructorchoiceacceptgrades'];
}
if (isset($config['instructorchoiceallowroster'])) {
$type->lti_allowroster = $config['instructorchoiceallowroster'];
}
if (isset($config['instructorcustomparameters'])) {
$type->lti_allowsetting = $config['instructorcustomparameters'];
}
return $type;
}
/**
* Generates some of the tool configuration based on the admin configuration details
*
* @param int $id
*
* @return stdClass Configuration details
*/
function lti_get_type_type_config($id) {
global $DB;
$basicltitype = $DB->get_record('lti_types', array('id' => $id));
$config = lti_get_type_config($id);
$type = new \stdClass();
$type->lti_typename = $basicltitype->name;
$type->typeid = $basicltitype->id;
$type->toolproxyid = $basicltitype->toolproxyid;
$type->lti_toolurl = $basicltitype->baseurl;
$type->lti_ltiversion = $basicltitype->ltiversion;
$type->lti_clientid = $basicltitype->clientid;
$type->lti_clientid_disabled = $type->lti_clientid;
$type->lti_description = $basicltitype->description;
$type->lti_parameters = $basicltitype->parameter;
$type->lti_icon = $basicltitype->icon;
$type->lti_secureicon = $basicltitype->secureicon;
if (isset($config['resourcekey'])) {
$type->lti_resourcekey = $config['resourcekey'];
}
if (isset($config['password'])) {
$type->lti_password = $config['password'];
}
if (isset($config['publickey'])) {
$type->lti_publickey = $config['publickey'];
}
if (isset($config['initiatelogin'])) {
$type->lti_initiatelogin = $config['initiatelogin'];
}
if (isset($config['redirectionuris'])) {
$type->lti_redirectionuris = $config['redirectionuris'];
}
if (isset($config['sendname'])) {
$type->lti_sendname = $config['sendname'];
}
if (isset($config['instructorchoicesendname'])) {
$type->lti_instructorchoicesendname = $config['instructorchoicesendname'];
}
if (isset($config['sendemailaddr'])) {
$type->lti_sendemailaddr = $config['sendemailaddr'];
}
if (isset($config['instructorchoicesendemailaddr'])) {
$type->lti_instructorchoicesendemailaddr = $config['instructorchoicesendemailaddr'];
}
if (isset($config['acceptgrades'])) {
$type->lti_acceptgrades = $config['acceptgrades'];
}
if (isset($config['instructorchoiceacceptgrades'])) {
$type->lti_instructorchoiceacceptgrades = $config['instructorchoiceacceptgrades'];
}
if (isset($config['allowroster'])) {
$type->lti_allowroster = $config['allowroster'];
}
if (isset($config['instructorchoiceallowroster'])) {
$type->lti_instructorchoiceallowroster = $config['instructorchoiceallowroster'];
}
if (isset($config['customparameters'])) {
$type->lti_customparameters = $config['customparameters'];
}
if (isset($config['forcessl'])) {
$type->lti_forcessl = $config['forcessl'];
}
if (isset($config['organizationid'])) {
$type->lti_organizationid = $config['organizationid'];
}
if (isset($config['organizationurl'])) {
$type->lti_organizationurl = $config['organizationurl'];
}
if (isset($config['organizationdescr'])) {
$type->lti_organizationdescr = $config['organizationdescr'];
}
if (isset($config['launchcontainer'])) {
$type->lti_launchcontainer = $config['launchcontainer'];
}
if (isset($config['coursevisible'])) {
$type->lti_coursevisible = $config['coursevisible'];
}
if (isset($config['contentitem'])) {
$type->lti_contentitem = $config['contentitem'];
}
if (isset($config['toolurl_ContentItemSelectionRequest'])) {
$type->lti_toolurl_ContentItemSelectionRequest = $config['toolurl_ContentItemSelectionRequest'];
}
if (isset($config['debuglaunch'])) {
$type->lti_debuglaunch = $config['debuglaunch'];
}
if (isset($config['module_class_type'])) {
$type->lti_module_class_type = $config['module_class_type'];
}
// Get the parameters from the LTI services.
foreach ($config as $name => $value) {
if (strpos($name, 'ltiservice_') === 0) {
$type->{$name} = $config[$name];
}
}
return $type;
}
function lti_prepare_type_for_save($type, $config) {
if (isset($config->lti_toolurl)) {
$type->baseurl = $config->lti_toolurl;
$type->tooldomain = lti_get_domain_from_url($config->lti_toolurl);
}
if (isset($config->lti_description)) {
$type->description = $config->lti_description;
}
if (isset($config->lti_typename)) {
$type->name = $config->lti_typename;
}
if (isset($config->lti_ltiversion)) {
$type->ltiversion = $config->lti_ltiversion;
}
if (isset($config->lti_clientid)) {
$type->clientid = $config->lti_clientid;
}
if ((!empty($type->ltiversion) && $type->ltiversion === LTI_VERSION_1P3) && empty($type->clientid)) {
$type->clientid = random_string(15);
} else if (empty($type->clientid)) {
$type->clientid = null;
}
if (isset($config->lti_coursevisible)) {
$type->coursevisible = $config->lti_coursevisible;
}
if (isset($config->lti_icon)) {
$type->icon = $config->lti_icon;
}
if (isset($config->lti_secureicon)) {
$type->secureicon = $config->lti_secureicon;
}
$type->forcessl = !empty($config->lti_forcessl) ? $config->lti_forcessl : 0;
$config->lti_forcessl = $type->forcessl;
if (isset($config->lti_contentitem)) {
$type->contentitem = !empty($config->lti_contentitem) ? $config->lti_contentitem : 0;
$config->lti_contentitem = $type->contentitem;
}
if (isset($config->lti_toolurl_ContentItemSelectionRequest)) {
if (!empty($config->lti_toolurl_ContentItemSelectionRequest)) {
$type->toolurl_ContentItemSelectionRequest = $config->lti_toolurl_ContentItemSelectionRequest;
} else {
$type->toolurl_ContentItemSelectionRequest = '';
}
$config->lti_toolurl_ContentItemSelectionRequest = $type->toolurl_ContentItemSelectionRequest;
}
$type->timemodified = time();
unset ($config->lti_typename);
unset ($config->lti_toolurl);
unset ($config->lti_description);
unset ($config->lti_ltiversion);
unset ($config->lti_clientid);
unset ($config->lti_icon);
unset ($config->lti_secureicon);
}
function lti_update_type($type, $config) {
global $DB, $CFG;
lti_prepare_type_for_save($type, $config);
if (lti_request_is_using_ssl() && !empty($type->secureicon)) {
$clearcache = !isset($config->oldicon) || ($config->oldicon !== $type->secureicon);
} else {
$clearcache = isset($type->icon) && (!isset($config->oldicon) || ($config->oldicon !== $type->icon));
}
unset($config->oldicon);
if ($DB->update_record('lti_types', $type)) {
foreach ($config as $key => $value) {
if (substr($key, 0, 4) == 'lti_' && !is_null($value)) {
$record = new \StdClass();
$record->typeid = $type->id;
$record->name = substr($key, 4);
$record->value = $value;
lti_update_config($record);
}
if (substr($key, 0, 11) == 'ltiservice_' && !is_null($value)) {
$record = new \StdClass();
$record->typeid = $type->id;
$record->name = $key;
$record->value = $value;
lti_update_config($record);
}
}
require_once($CFG->libdir.'/modinfolib.php');
if ($clearcache) {
$sql = "SELECT DISTINCT course
FROM {lti}
WHERE typeid = ?";
$courses = $DB->get_fieldset_sql($sql, array($type->id));
foreach ($courses as $courseid) {
rebuild_course_cache($courseid, true);
}
}
}
}
function lti_add_type($type, $config) {
global $USER, $SITE, $DB;
lti_prepare_type_for_save($type, $config);
if (!isset($type->state)) {
$type->state = LTI_TOOL_STATE_PENDING;
}
if (!isset($type->ltiversion)) {
$type->ltiversion = LTI_VERSION_1;
}
if (!isset($type->timecreated)) {
$type->timecreated = time();
}
if (!isset($type->createdby)) {
$type->createdby = $USER->id;
}
if (!isset($type->course)) {
$type->course = $SITE->id;
}
// Create a salt value to be used for signing passed data to extension services
// The outcome service uses the service salt on the instance. This can be used
// for communication with services not related to a specific LTI instance.
$config->lti_servicesalt = uniqid('', true);
$id = $DB->insert_record('lti_types', $type);
if ($id) {
foreach ($config as $key => $value) {
if (!is_null($value)) {
if (substr($key, 0, 4) === 'lti_') {
$fieldname = substr($key, 4);
} else if (substr($key, 0, 11) !== 'ltiservice_') {
continue;
} else {
$fieldname = $key;
}
$record = new \StdClass();
$record->typeid = $id;
$record->name = $fieldname;
$record->value = $value;
lti_add_config($record);
}
}
}
return $id;
}
/**
* Given an array of tool proxies, filter them based on their state
*
* @param array $toolproxies An array of lti_tool_proxies records
* @param int $state One of the LTI_TOOL_PROXY_STATE_* constants
*
* @return array
*/
function lti_filter_tool_proxy_types(array $toolproxies, $state) {
$return = array();
foreach ($toolproxies as $key => $toolproxy) {
if ($toolproxy->state == $state) {
$return[$key] = $toolproxy;
}
}
return $return;
}
/**
* Get the tool proxy instance given its GUID
*
* @param string $toolproxyguid Tool proxy GUID value
*
* @return object
*/
function lti_get_tool_proxy_from_guid($toolproxyguid) {
global $DB;
$toolproxy = $DB->get_record('lti_tool_proxies', array('guid' => $toolproxyguid));
return $toolproxy;
}
/**
* Get the tool proxy instance given its registration URL
*
* @param string $regurl Tool proxy registration URL
*
* @return array The record of the tool proxy with this url
*/
function lti_get_tool_proxies_from_registration_url($regurl) {
global $DB;
return $DB->get_records_sql(
'SELECT * FROM {lti_tool_proxies}
WHERE '.$DB->sql_compare_text('regurl', 256).' = :regurl',
array('regurl' => $regurl)
);
}
/**
* Generates some of the tool proxy configuration based on the admin configuration details
*
* @param int $id
*
* @return mixed Tool Proxy details
*/
function lti_get_tool_proxy($id) {
global $DB;
$toolproxy = $DB->get_record('lti_tool_proxies', array('id' => $id));
return $toolproxy;
}
/**
* Returns lti tool proxies.
*
* @param bool $orphanedonly Only retrieves tool proxies that have no type associated with them
* @return array of basicLTI types
*/
function lti_get_tool_proxies($orphanedonly) {
global $DB;
if ($orphanedonly) {
$usedproxyids = array_values($DB->get_fieldset_select('lti_types', 'toolproxyid', 'toolproxyid IS NOT NULL'));
$proxies = $DB->get_records('lti_tool_proxies', null, 'state DESC, timemodified DESC');
foreach ($proxies as $key => $value) {
if (in_array($value->id, $usedproxyids)) {
unset($proxies[$key]);
}
}
return $proxies;
} else {
return $DB->get_records('lti_tool_proxies', null, 'state DESC, timemodified DESC');
}
}
/**
* Generates some of the tool proxy configuration based on the admin configuration details
*
* @param int $id
*
* @return mixed Tool Proxy details
*/
function lti_get_tool_proxy_config($id) {
$toolproxy = lti_get_tool_proxy($id);
$tp = new \stdClass();
$tp->lti_registrationname = $toolproxy->name;
$tp->toolproxyid = $toolproxy->id;
$tp->state = $toolproxy->state;
$tp->lti_registrationurl = $toolproxy->regurl;
$tp->lti_capabilities = explode("\n", $toolproxy->capabilityoffered);
$tp->lti_services = explode("\n", $toolproxy->serviceoffered);
return $tp;
}
/**
* Update the database with a tool proxy instance
*
* @param object $config Tool proxy definition
*
* @return int Record id number
*/
function lti_add_tool_proxy($config) {
global $USER, $DB;
$toolproxy = new \stdClass();
if (isset($config->lti_registrationname)) {
$toolproxy->name = trim($config->lti_registrationname);
}
if (isset($config->lti_registrationurl)) {
$toolproxy->regurl = trim($config->lti_registrationurl);
}
if (isset($config->lti_capabilities)) {
$toolproxy->capabilityoffered = implode("\n", $config->lti_capabilities);
} else {
$toolproxy->capabilityoffered = implode("\n", array_keys(lti_get_capabilities()));
}
if (isset($config->lti_services)) {
$toolproxy->serviceoffered = implode("\n", $config->lti_services);
} else {
$func = function($s) {
return $s->get_id();
};
$servicenames = array_map($func, lti_get_services());
$toolproxy->serviceoffered = implode("\n", $servicenames);
}
if (isset($config->toolproxyid) && !empty($config->toolproxyid)) {
$toolproxy->id = $config->toolproxyid;
if (!isset($toolproxy->state) || ($toolproxy->state != LTI_TOOL_PROXY_STATE_ACCEPTED)) {
$toolproxy->state = LTI_TOOL_PROXY_STATE_CONFIGURED;
$toolproxy->guid = random_string();
$toolproxy->secret = random_string();
}
$id = lti_update_tool_proxy($toolproxy);
} else {
$toolproxy->state = LTI_TOOL_PROXY_STATE_CONFIGURED;
$toolproxy->timemodified = time();
$toolproxy->timecreated = $toolproxy->timemodified;
if (!isset($toolproxy->createdby)) {
$toolproxy->createdby = $USER->id;
}
$toolproxy->guid = random_string();
$toolproxy->secret = random_string();
$id = $DB->insert_record('lti_tool_proxies', $toolproxy);
}
return $id;
}
/**
* Updates a tool proxy in the database
*
* @param object $toolproxy Tool proxy
*
* @return int Record id number
*/
function lti_update_tool_proxy($toolproxy) {
global $DB;
$toolproxy->timemodified = time();
$id = $DB->update_record('lti_tool_proxies', $toolproxy);
return $id;
}
/**
* Delete a Tool Proxy
*
* @param int $id Tool Proxy id
*/
function lti_delete_tool_proxy($id) {
global $DB;
$DB->delete_records('lti_tool_settings', array('toolproxyid' => $id));
$tools = $DB->get_records('lti_types', array('toolproxyid' => $id));
foreach ($tools as $tool) {
lti_delete_type($tool->id);
}
$DB->delete_records('lti_tool_proxies', array('id' => $id));
}
/**
* Add a tool configuration in the database
*
* @param object $config Tool configuration
*
* @return int Record id number
*/
function lti_add_config($config) {
global $DB;
return $DB->insert_record('lti_types_config', $config);
}
/**
* Updates a tool configuration in the database
*
* @param object $config Tool configuration
*
* @return mixed Record id number
*/
function lti_update_config($config) {
global $DB;
$old = $DB->get_record('lti_types_config', array('typeid' => $config->typeid, 'name' => $config->name));
if ($old) {
$config->id = $old->id;
$return = $DB->update_record('lti_types_config', $config);
} else {
$return = $DB->insert_record('lti_types_config', $config);
}
return $return;
}
/**
* Gets the tool settings
*
* @param int $toolproxyid Id of tool proxy record (or tool ID if negative)
* @param int $courseid Id of course (null if system settings)
* @param int $instanceid Id of course module (null if system or context settings)
*
* @return array Array settings
*/
function lti_get_tool_settings($toolproxyid, $courseid = null, $instanceid = null) {
global $DB;
$settings = array();
if ($toolproxyid > 0) {
$settingsstr = $DB->get_field('lti_tool_settings', 'settings', array('toolproxyid' => $toolproxyid,
'course' => $courseid, 'coursemoduleid' => $instanceid));
} else {
$settingsstr = $DB->get_field('lti_tool_settings', 'settings', array('typeid' => -$toolproxyid,
'course' => $courseid, 'coursemoduleid' => $instanceid));
}
if ($settingsstr !== false) {
$settings = json_decode($settingsstr, true);
}
return $settings;
}
/**
* Sets the tool settings (
*
* @param array $settings Array of settings
* @param int $toolproxyid Id of tool proxy record (or tool ID if negative)
* @param int $courseid Id of course (null if system settings)
* @param int $instanceid Id of course module (null if system or context settings)
*/
function lti_set_tool_settings($settings, $toolproxyid, $courseid = null, $instanceid = null) {
global $DB;
$json = json_encode($settings);
if ($toolproxyid >= 0) {
$record = $DB->get_record('lti_tool_settings', array('toolproxyid' => $toolproxyid,
'course' => $courseid, 'coursemoduleid' => $instanceid));
} else {
$record = $DB->get_record('lti_tool_settings', array('typeid' => -$toolproxyid,
'course' => $courseid, 'coursemoduleid' => $instanceid));
}
if ($record !== false) {
$DB->update_record('lti_tool_settings', (object)array('id' => $record->id, 'settings' => $json, 'timemodified' => time()));
} else {
$record = new \stdClass();
if ($toolproxyid > 0) {
$record->toolproxyid = $toolproxyid;
} else {
$record->typeid = -$toolproxyid;
}
$record->course = $courseid;
$record->coursemoduleid = $instanceid;
$record->settings = $json;
$record->timecreated = time();
$record->timemodified = $record->timecreated;
$DB->insert_record('lti_tool_settings', $record);
}
}
/**
* Signs the petition to launch the external tool using OAuth
*
* @param array $oldparms Parameters to be passed for signing
* @param string $endpoint url of the external tool
* @param string $method Method for sending the parameters (e.g. POST)
* @param string $oauthconsumerkey
* @param string $oauthconsumersecret
* @return array|null
*/
function lti_sign_parameters($oldparms, $endpoint, $method, $oauthconsumerkey, $oauthconsumersecret) {
$parms = $oldparms;
$testtoken = '';
// TODO: Switch to core oauthlib once implemented - MDL-30149.
$hmacmethod = new lti\OAuthSignatureMethod_HMAC_SHA1();
$testconsumer = new lti\OAuthConsumer($oauthconsumerkey, $oauthconsumersecret, null);
$accreq = lti\OAuthRequest::from_consumer_and_token($testconsumer, $testtoken, $method, $endpoint, $parms);
$accreq->sign_request($hmacmethod, $testconsumer, $testtoken);
$newparms = $accreq->get_parameters();
return $newparms;
}
/**
* Converts the message paramters to their equivalent JWT claim and signs the payload to launch the external tool using JWT
*
* @param array $parms Parameters to be passed for signing
* @param string $endpoint url of the external tool
* @param string $oauthconsumerkey
* @param string $typeid ID of LTI tool type
* @param string $nonce Nonce value to use
* @return array|null
*/
function lti_sign_jwt($parms, $endpoint, $oauthconsumerkey, $typeid = 0, $nonce = '') {
global $CFG;
if (empty($typeid)) {
$typeid = 0;
}
$messagetypemapping = lti_get_jwt_message_type_mapping();
if (isset($parms['lti_message_type']) && array_key_exists($parms['lti_message_type'], $messagetypemapping)) {
$parms['lti_message_type'] = $messagetypemapping[$parms['lti_message_type']];
}
if (isset($parms['roles'])) {
$roles = explode(',', $parms['roles']);
$newroles = array();
foreach ($roles as $role) {
if (strpos($role, 'urn:lti:role:ims/lis/') === 0) {
$role = 'http://purl.imsglobal.org/vocab/lis/v2/membership#' . substr($role, 21);
} else if (strpos($role, 'urn:lti:instrole:ims/lis/') === 0) {
$role = 'http://purl.imsglobal.org/vocab/lis/v2/institution/person#' . substr($role, 25);
} else if (strpos($role, 'urn:lti:sysrole:ims/lis/') === 0) {
$role = 'http://purl.imsglobal.org/vocab/lis/v2/system/person#' . substr($role, 24);
} else if ((strpos($role, '://') === false) && (strpos($role, 'urn:') !== 0)) {
$role = "http://purl.imsglobal.org/vocab/lis/v2/membership#{$role}";
}
$newroles[] = $role;
}
$parms['roles'] = implode(',', $newroles);
}
$now = time();
if (empty($nonce)) {
$nonce = bin2hex(openssl_random_pseudo_bytes(10));
}
$claimmapping = lti_get_jwt_claim_mapping();
$payload = array(
'nonce' => $nonce,
'iat' => $now,
'exp' => $now + 60,
);
$payload['iss'] = $CFG->wwwroot;
$payload['aud'] = $oauthconsumerkey;
$payload[LTI_JWT_CLAIM_PREFIX . '/claim/deployment_id'] = strval($typeid);
$payload[LTI_JWT_CLAIM_PREFIX . '/claim/target_link_uri'] = $endpoint;
foreach ($parms as $key => $value) {
$claim = LTI_JWT_CLAIM_PREFIX;
if (array_key_exists($key, $claimmapping)) {
$mapping = $claimmapping[$key];
if ($mapping['isarray']) {
$value = explode(',', $value);
sort($value);
}
if (!empty($mapping['suffix'])) {
$claim .= "-{$mapping['suffix']}";
}
$claim .= '/claim/';
if (is_null($mapping['group'])) {
$payload[$mapping['claim']] = $value;
} else if (empty($mapping['group'])) {
$payload["{$claim}{$mapping['claim']}"] = $value;
} else {
$claim .= $mapping['group'];
$payload[$claim][$mapping['claim']] = $value;
}
} else if (strpos($key, 'custom_') === 0) {
$payload["{$claim}/claim/custom"][substr($key, 7)] = $value;
} else if (strpos($key, 'ext_') === 0) {
$payload["{$claim}/claim/ext"][substr($key, 4)] = $value;
}
}
$privatekey = get_config('mod_lti', 'privatekey');
$kid = get_config('mod_lti', 'kid');
$jwt = JWT::encode($payload, $privatekey, 'RS256', $kid);
$newparms = array();
$newparms['id_token'] = $jwt;
return $newparms;
}
/**
* Verfies the JWT and converts its claims to their equivalent message parameter.
*
* @param int $typeid
* @param string $jwtparam JWT parameter
*
* @return array message parameters
* @throws moodle_exception
*/
function lti_convert_from_jwt($typeid, $jwtparam) {
$params = array();
$parts = explode('.', $jwtparam);
$ok = (count($parts) === 3);
if ($ok) {
$payload = JWT::urlsafeB64Decode($parts[1]);
$claims = json_decode($payload, true);
$ok = !is_null($claims) && !empty($claims['iss']);
}
if ($ok) {
lti_verify_jwt_signature($typeid, $claims['iss'], $jwtparam);
$params['oauth_consumer_key'] = $claims['iss'];
foreach (lti_get_jwt_claim_mapping() as $key => $mapping) {
$claim = LTI_JWT_CLAIM_PREFIX;
if (!empty($mapping['suffix'])) {
$claim .= "-{$mapping['suffix']}";
}
$claim .= '/claim/';
if (is_null($mapping['group'])) {
$claim = $mapping['claim'];
} else if (empty($mapping['group'])) {
$claim .= $mapping['claim'];
} else {
$claim .= $mapping['group'];
}
if (isset($claims[$claim])) {
$value = null;
if (empty($mapping['group'])) {
$value = $claims[$claim];
} else {
$group = $claims[$claim];
if (is_array($group) && array_key_exists($mapping['claim'], $group)) {
$value = $group[$mapping['claim']];
}
}
if (!empty($value) && $mapping['isarray']) {
if (is_array($value)) {
if (is_array($value[0])) {
$value = json_encode($value);
} else {
$value = implode(',', $value);
}
}
}
if (!is_null($value) && is_string($value) && (strlen($value) > 0)) {
$params[$key] = $value;
}
}
$claim = LTI_JWT_CLAIM_PREFIX . '/claim/custom';
if (isset($claims[$claim])) {
$custom = $claims[$claim];
if (is_array($custom)) {
foreach ($custom as $key => $value) {
$params["custom_{$key}"] = $value;
}
}
}
$claim = LTI_JWT_CLAIM_PREFIX . '/claim/ext';
if (isset($claims[$claim])) {
$ext = $claims[$claim];
if (is_array($ext)) {
foreach ($ext as $key => $value) {
$params["ext_{$key}"] = $value;
}
}
}
}
}
if (isset($params['content_items'])) {
$params['content_items'] = lti_convert_content_items($params['content_items']);
}
$messagetypemapping = lti_get_jwt_message_type_mapping();
if (isset($params['lti_message_type']) && array_key_exists($params['lti_message_type'], $messagetypemapping)) {
$params['lti_message_type'] = $messagetypemapping[$params['lti_message_type']];
}
return $params;
}
/**
* Posts the launch petition HTML
*
* @param array $newparms Signed parameters
* @param string $endpoint URL of the external tool
* @param bool $debug Debug (true/false)
* @return string
*/
function lti_post_launch_html($newparms, $endpoint, $debug=false) {
$r = "\n";
if ( ! $debug ) {
$r .= " \n";
}
return $r;
}
/**
* Generate the form for initiating a login request for an LTI 1.3 message
*
* @param int $courseid Course ID
* @param int $id LTI instance ID
* @param stdClass|null $instance LTI instance
* @param stdClass $config Tool type configuration
* @param string $messagetype LTI message type
* @param string $title Title of content item
* @param string $text Description of content item
* @return string
*/
function lti_initiate_login($courseid, $id, $instance, $config, $messagetype = 'basic-lti-launch-request', $title = '',
$text = '') {
global $SESSION, $USER, $CFG;
if (!empty($instance)) {
$endpoint = !empty($instance->toolurl) ? $instance->toolurl : $config->lti_toolurl;
} else {
$endpoint = $config->lti_toolurl;
if (($messagetype === 'ContentItemSelectionRequest') && !empty($config->lti_toolurl_ContentItemSelectionRequest)) {
$endpoint = $config->lti_toolurl_ContentItemSelectionRequest;
}
}
$endpoint = trim($endpoint);
// If SSL is forced make sure https is on the normal launch URL.
if (isset($config->lti_forcessl) && ($config->lti_forcessl == '1')) {
$endpoint = lti_ensure_url_is_https($endpoint);
} else if (!strstr($endpoint, '://')) {
$endpoint = 'http://' . $endpoint;
}
$params = array();
$params['iss'] = $CFG->wwwroot;
$params['target_link_uri'] = $endpoint;
$params['login_hint'] = $USER->id;
$params['lti_message_hint'] = $id;
$SESSION->lti_message_hint = "{$courseid},{$config->typeid},{$id}," . base64_encode($title) . ',' .
base64_encode($text);
$r = "\n";
$r .= "\n";
return $r;
}
function lti_get_type($typeid) {
global $DB;
return $DB->get_record('lti_types', array('id' => $typeid));
}
function lti_get_launch_container($lti, $toolconfig) {
if (empty($lti->launchcontainer)) {
$lti->launchcontainer = LTI_LAUNCH_CONTAINER_DEFAULT;
}
if ($lti->launchcontainer == LTI_LAUNCH_CONTAINER_DEFAULT) {
if (isset($toolconfig['launchcontainer'])) {
$launchcontainer = $toolconfig['launchcontainer'];
}
} else {
$launchcontainer = $lti->launchcontainer;
}
if (empty($launchcontainer) || $launchcontainer == LTI_LAUNCH_CONTAINER_DEFAULT) {
$launchcontainer = LTI_LAUNCH_CONTAINER_EMBED_NO_BLOCKS;
}
$devicetype = core_useragent::get_device_type();
// Scrolling within the object element doesn't work on iOS or Android
// Opening the popup window also had some issues in testing
// For mobile devices, always take up the entire screen to ensure the best experience.
if ($devicetype === core_useragent::DEVICETYPE_MOBILE || $devicetype === core_useragent::DEVICETYPE_TABLET ) {
$launchcontainer = LTI_LAUNCH_CONTAINER_REPLACE_MOODLE_WINDOW;
}
return $launchcontainer;
}
function lti_request_is_using_ssl() {
global $CFG;
return (stripos($CFG->wwwroot, 'https://') === 0);
}
function lti_ensure_url_is_https($url) {
if (!strstr($url, '://')) {
$url = 'https://' . $url;
} else {
// If the URL starts with http, replace with https.
if (stripos($url, 'http://') === 0) {
$url = 'https://' . substr($url, 7);
}
}
return $url;
}
/**
* Determines if we should try to log the request
*
* @param string $rawbody
* @return bool
*/
function lti_should_log_request($rawbody) {
global $CFG;
if (empty($CFG->mod_lti_log_users)) {
return false;
}
$logusers = explode(',', $CFG->mod_lti_log_users);
if (empty($logusers)) {
return false;
}
try {
$xml = new \SimpleXMLElement($rawbody);
$ns = $xml->getNamespaces();
$ns = array_shift($ns);
$xml->registerXPathNamespace('lti', $ns);
$requestuserid = '';
if ($node = $xml->xpath('//lti:userId')) {
$node = $node[0];
$requestuserid = clean_param((string) $node, PARAM_INT);
} else if ($node = $xml->xpath('//lti:sourcedId')) {
$node = $node[0];
$resultjson = json_decode((string) $node);
$requestuserid = clean_param($resultjson->data->userid, PARAM_INT);
}
} catch (Exception $e) {
return false;
}
if (empty($requestuserid) or !in_array($requestuserid, $logusers)) {
return false;
}
return true;
}
/**
* Logs the request to a file in temp dir.
*
* @param string $rawbody
*/
function lti_log_request($rawbody) {
if ($tempdir = make_temp_directory('mod_lti', false)) {
if ($tempfile = tempnam($tempdir, 'mod_lti_request'.date('YmdHis'))) {
$content = "Request Headers:\n";
foreach (moodle\mod\lti\OAuthUtil::get_headers() as $header => $value) {
$content .= "$header: $value\n";
}
$content .= "Request Body:\n";
$content .= $rawbody;
file_put_contents($tempfile, $content);
chmod($tempfile, 0644);
}
}
}
/**
* Log an LTI response.
*
* @param string $responsexml The response XML
* @param Exception $e If there was an exception, pass that too
*/
function lti_log_response($responsexml, $e = null) {
if ($tempdir = make_temp_directory('mod_lti', false)) {
if ($tempfile = tempnam($tempdir, 'mod_lti_response'.date('YmdHis'))) {
$content = '';
if ($e instanceof Exception) {
$info = get_exception_info($e);
$content .= "Exception:\n";
$content .= "Message: $info->message\n";
$content .= "Debug info: $info->debuginfo\n";
$content .= "Backtrace:\n";
$content .= format_backtrace($info->backtrace, true);
$content .= "\n";
}
$content .= "Response XML:\n";
$content .= $responsexml;
file_put_contents($tempfile, $content);
chmod($tempfile, 0644);
}
}
}
/**
* Fetches LTI type configuration for an LTI instance
*
* @param stdClass $instance
* @return array Can be empty if no type is found
*/
function lti_get_type_config_by_instance($instance) {
$typeid = null;
if (empty($instance->typeid)) {
$tool = lti_get_tool_by_url_match($instance->toolurl, $instance->course);
if ($tool) {
$typeid = $tool->id;
}
} else {
$typeid = $instance->typeid;
}
if (!empty($typeid)) {
return lti_get_type_config($typeid);
}
return array();
}
/**
* Enforce type config settings onto the LTI instance
*
* @param stdClass $instance
* @param array $typeconfig
*/
function lti_force_type_config_settings($instance, array $typeconfig) {
$forced = array(
'instructorchoicesendname' => 'sendname',
'instructorchoicesendemailaddr' => 'sendemailaddr',
'instructorchoiceacceptgrades' => 'acceptgrades',
);
foreach ($forced as $instanceparam => $typeconfigparam) {
if (array_key_exists($typeconfigparam, $typeconfig) && $typeconfig[$typeconfigparam] != LTI_SETTING_DELEGATE) {
$instance->$instanceparam = $typeconfig[$typeconfigparam];
}
}
}
/**
* Initializes an array with the capabilities supported by the LTI module
*
* @return array List of capability names (without a dollar sign prefix)
*/
function lti_get_capabilities() {
$capabilities = array(
'basic-lti-launch-request' => '',
'ContentItemSelectionRequest' => '',
'ToolProxyRegistrationRequest' => '',
'Context.id' => 'context_id',
'Context.title' => 'context_title',
'Context.label' => 'context_label',
'Context.sourcedId' => 'lis_course_section_sourcedid',
'Context.longDescription' => '$COURSE->summary',
'Context.timeFrame.begin' => '$COURSE->startdate',
'CourseSection.title' => 'context_title',
'CourseSection.label' => 'context_label',
'CourseSection.sourcedId' => 'lis_course_section_sourcedid',
'CourseSection.longDescription' => '$COURSE->summary',
'CourseSection.timeFrame.begin' => '$COURSE->startdate',
'ResourceLink.id' => 'resource_link_id',
'ResourceLink.title' => 'resource_link_title',
'ResourceLink.description' => 'resource_link_description',
'User.id' => 'user_id',
'User.username' => '$USER->username',
'Person.name.full' => 'lis_person_name_full',
'Person.name.given' => 'lis_person_name_given',
'Person.name.family' => 'lis_person_name_family',
'Person.email.primary' => 'lis_person_contact_email_primary',
'Person.sourcedId' => 'lis_person_sourcedid',
'Person.name.middle' => '$USER->middlename',
'Person.address.street1' => '$USER->address',
'Person.address.locality' => '$USER->city',
'Person.address.country' => '$USER->country',
'Person.address.timezone' => '$USER->timezone',
'Person.phone.primary' => '$USER->phone1',
'Person.phone.mobile' => '$USER->phone2',
'Person.webaddress' => '$USER->url',
'Membership.role' => 'roles',
'Result.sourcedId' => 'lis_result_sourcedid',
'Result.autocreate' => 'lis_outcome_service_url',
'BasicOutcome.sourcedId' => 'lis_result_sourcedid',
'BasicOutcome.url' => 'lis_outcome_service_url',
'Moodle.Person.userGroupIds' => null);
return $capabilities;
}
/**
* Initializes an array with the services supported by the LTI module
*
* @return array List of services
*/
function lti_get_services() {
$services = array();
$definedservices = core_component::get_plugin_list('ltiservice');
foreach ($definedservices as $name => $location) {
$classname = "\\ltiservice_{$name}\\local\\service\\{$name}";
$services[] = new $classname();
}
return $services;
}
/**
* Initializes an instance of the named service
*
* @param string $servicename Name of service
*
* @return bool|\mod_lti\local\ltiservice\service_base Service
*/
function lti_get_service_by_name($servicename) {
$service = false;
$classname = "\\ltiservice_{$servicename}\\local\\service\\{$servicename}";
if (class_exists($classname)) {
$service = new $classname();
}
return $service;
}
/**
* Finds a service by id
*
* @param \mod_lti\local\ltiservice\service_base[] $services Array of services
* @param string $resourceid ID of resource
*
* @return mod_lti\local\ltiservice\service_base Service
*/
function lti_get_service_by_resource_id($services, $resourceid) {
$service = false;
foreach ($services as $aservice) {
foreach ($aservice->get_resources() as $resource) {
if ($resource->get_id() === $resourceid) {
$service = $aservice;
break 2;
}
}
}
return $service;
}
/**
* Initializes an array with the scopes for services supported by the LTI module
*
* @param object $type LTI tool type
* @param array $typeconfig LTI tool type configuration
*
* @return array List of scopes
*/
function lti_get_permitted_service_scopes($type, $typeconfig) {
$services = lti_get_services();
$scopes = array();
foreach ($services as $service) {
$service->set_type($type);
$service->set_typeconfig($typeconfig);
$servicescopes = $service->get_permitted_scopes();
if (!empty($servicescopes)) {
$scopes = array_merge($scopes, $servicescopes);
}
}
return $scopes;
}
/**
* Extracts the named contexts from a tool proxy
*
* @param object $json
*
* @return array Contexts
*/
function lti_get_contexts($json) {
$contexts = array();
if (isset($json->{'@context'})) {
foreach ($json->{'@context'} as $context) {
if (is_object($context)) {
$contexts = array_merge(get_object_vars($context), $contexts);
}
}
}
return $contexts;
}
/**
* Converts an ID to a fully-qualified ID
*
* @param array $contexts
* @param string $id
*
* @return string Fully-qualified ID
*/
function lti_get_fqid($contexts, $id) {
$parts = explode(':', $id, 2);
if (count($parts) > 1) {
if (array_key_exists($parts[0], $contexts)) {
$id = $contexts[$parts[0]] . $parts[1];
}
}
return $id;
}
/**
* Returns the icon for the given tool type
*
* @param stdClass $type The tool type
*
* @return string The url to the tool type's corresponding icon
*/
function get_tool_type_icon_url(stdClass $type) {
global $OUTPUT;
$iconurl = $type->secureicon;
if (empty($iconurl)) {
$iconurl = $type->icon;
}
if (empty($iconurl)) {
$iconurl = $OUTPUT->image_url('icon', 'lti')->out();
}
return $iconurl;
}
/**
* Returns the edit url for the given tool type
*
* @param stdClass $type The tool type
*
* @return string The url to edit the tool type
*/
function get_tool_type_edit_url(stdClass $type) {
$url = new moodle_url('/mod/lti/typessettings.php',
array('action' => 'update', 'id' => $type->id, 'sesskey' => sesskey(), 'returnto' => 'toolconfigure'));
return $url->out();
}
/**
* Returns the edit url for the given tool proxy.
*
* @param stdClass $proxy The tool proxy
*
* @return string The url to edit the tool type
*/
function get_tool_proxy_edit_url(stdClass $proxy) {
$url = new moodle_url('/mod/lti/registersettings.php',
array('action' => 'update', 'id' => $proxy->id, 'sesskey' => sesskey(), 'returnto' => 'toolconfigure'));
return $url->out();
}
/**
* Returns the course url for the given tool type
*
* @param stdClass $type The tool type
*
* @return string The url to the course of the tool type, void if it is a site wide type
*/
function get_tool_type_course_url(stdClass $type) {
if ($type->course != 1) {
$url = new moodle_url('/course/view.php', array('id' => $type->course));
return $url->out();
}
return null;
}
/**
* Returns the icon and edit urls for the tool type and the course url if it is a course type.
*
* @param stdClass $type The tool type
*
* @return array The urls of the tool type
*/
function get_tool_type_urls(stdClass $type) {
$courseurl = get_tool_type_course_url($type);
$urls = array(
'icon' => get_tool_type_icon_url($type),
'edit' => get_tool_type_edit_url($type),
);
if ($courseurl) {
$urls['course'] = $courseurl;
}
$url = new moodle_url('/mod/lti/certs.php');
$urls['publickeyset'] = $url->out();
$url = new moodle_url('/mod/lti/token.php');
$urls['accesstoken'] = $url->out();
$url = new moodle_url('/mod/lti/auth.php');
$urls['authrequest'] = $url->out();
return $urls;
}
/**
* Returns the icon and edit urls for the tool proxy.
*
* @param stdClass $proxy The tool proxy
*
* @return array The urls of the tool proxy
*/
function get_tool_proxy_urls(stdClass $proxy) {
global $OUTPUT;
$urls = array(
'icon' => $OUTPUT->image_url('icon', 'lti')->out(),
'edit' => get_tool_proxy_edit_url($proxy),
);
return $urls;
}
/**
* Returns information on the current state of the tool type
*
* @param stdClass $type The tool type
*
* @return array An array with a text description of the state, and boolean for whether it is in each state:
* pending, configured, rejected, unknown
*/
function get_tool_type_state_info(stdClass $type) {
$isconfigured = false;
$ispending = false;
$isrejected = false;
$isunknown = false;
switch ($type->state) {
case LTI_TOOL_STATE_CONFIGURED:
$state = get_string('active', 'mod_lti');
$isconfigured = true;
break;
case LTI_TOOL_STATE_PENDING:
$state = get_string('pending', 'mod_lti');
$ispending = true;
break;
case LTI_TOOL_STATE_REJECTED:
$state = get_string('rejected', 'mod_lti');
$isrejected = true;
break;
default:
$state = get_string('unknownstate', 'mod_lti');
$isunknown = true;
break;
}
return array(
'text' => $state,
'pending' => $ispending,
'configured' => $isconfigured,
'rejected' => $isrejected,
'unknown' => $isunknown
);
}
/**
* Returns information on the configuration of the tool type
*
* @param stdClass $type The tool type
*
* @return array An array with configuration details
*/
function get_tool_type_config($type) {
global $CFG;
$platformid = $CFG->wwwroot;
$clientid = $type->clientid;
$deploymentid = $type->id;
$publickeyseturl = new moodle_url('/mod/lti/certs.php');
$publickeyseturl = $publickeyseturl->out();
$accesstokenurl = new moodle_url('/mod/lti/token.php');
$accesstokenurl = $accesstokenurl->out();
$authrequesturl = new moodle_url('/mod/lti/auth.php');
$authrequesturl = $authrequesturl->out();
return array(
'platformid' => $platformid,
'clientid' => $clientid,
'deploymentid' => $deploymentid,
'publickeyseturl' => $publickeyseturl,
'accesstokenurl' => $accesstokenurl,
'authrequesturl' => $authrequesturl
);
}
/**
* Returns a summary of each LTI capability this tool type requires in plain language
*
* @param stdClass $type The tool type
*
* @return array An array of text descriptions of each of the capabilities this tool type requires
*/
function get_tool_type_capability_groups($type) {
$capabilities = lti_get_enabled_capabilities($type);
$groups = array();
$hascourse = false;
$hasactivities = false;
$hasuseraccount = false;
$hasuserpersonal = false;
foreach ($capabilities as $capability) {
// Bail out early if we've already found all groups.
if (count($groups) >= 4) {
continue;
}
if (!$hascourse && preg_match('/^CourseSection/', $capability)) {
$hascourse = true;
$groups[] = get_string('courseinformation', 'mod_lti');
} else if (!$hasactivities && preg_match('/^ResourceLink/', $capability)) {
$hasactivities = true;
$groups[] = get_string('courseactivitiesorresources', 'mod_lti');
} else if (!$hasuseraccount && preg_match('/^User/', $capability) || preg_match('/^Membership/', $capability)) {
$hasuseraccount = true;
$groups[] = get_string('useraccountinformation', 'mod_lti');
} else if (!$hasuserpersonal && preg_match('/^Person/', $capability)) {
$hasuserpersonal = true;
$groups[] = get_string('userpersonalinformation', 'mod_lti');
}
}
return $groups;
}
/**
* Returns the ids of each instance of this tool type
*
* @param stdClass $type The tool type
*
* @return array An array of ids of the instances of this tool type
*/
function get_tool_type_instance_ids($type) {
global $DB;
return array_keys($DB->get_fieldset_select('lti', 'id', 'typeid = ?', array($type->id)));
}
/**
* Serialises this tool type
*
* @param stdClass $type The tool type
*
* @return array An array of values representing this type
*/
function serialise_tool_type(stdClass $type) {
global $CFG;
$capabilitygroups = get_tool_type_capability_groups($type);
$instanceids = get_tool_type_instance_ids($type);
// Clean the name. We don't want tags here.
$name = clean_param($type->name, PARAM_NOTAGS);
if (!empty($type->description)) {
// Clean the description. We don't want tags here.
$description = clean_param($type->description, PARAM_NOTAGS);
} else {
$description = get_string('editdescription', 'mod_lti');
}
return array(
'id' => $type->id,
'name' => $name,
'description' => $description,
'urls' => get_tool_type_urls($type),
'state' => get_tool_type_state_info($type),
'platformid' => $CFG->wwwroot,
'clientid' => $type->clientid,
'deploymentid' => $type->id,
'hascapabilitygroups' => !empty($capabilitygroups),
'capabilitygroups' => $capabilitygroups,
// Course ID of 1 means it's not linked to a course.
'courseid' => $type->course == 1 ? 0 : $type->course,
'instanceids' => $instanceids,
'instancecount' => count($instanceids)
);
}
/**
* Serialises this tool proxy.
*
* @param stdClass $proxy The tool proxy
*
* @return array An array of values representing this type
*/
function serialise_tool_proxy(stdClass $proxy) {
return array(
'id' => $proxy->id,
'name' => $proxy->name,
'description' => get_string('activatetoadddescription', 'mod_lti'),
'urls' => get_tool_proxy_urls($proxy),
'state' => array(
'text' => get_string('pending', 'mod_lti'),
'pending' => true,
'configured' => false,
'rejected' => false,
'unknown' => false
),
'hascapabilitygroups' => true,
'capabilitygroups' => array(),
'courseid' => 0,
'instanceids' => array(),
'instancecount' => 0
);
}
/**
* Loads the cartridge information into the tool type, if the launch url is for a cartridge file
*
* @param stdClass $type The tool type object to be filled in
* @since Moodle 3.1
*/
function lti_load_type_if_cartridge($type) {
if (!empty($type->lti_toolurl) && lti_is_cartridge($type->lti_toolurl)) {
lti_load_type_from_cartridge($type->lti_toolurl, $type);
}
}
/**
* Loads the cartridge information into the new tool, if the launch url is for a cartridge file
*
* @param stdClass $lti The tools config
* @since Moodle 3.1
*/
function lti_load_tool_if_cartridge($lti) {
if (!empty($lti->toolurl) && lti_is_cartridge($lti->toolurl)) {
lti_load_tool_from_cartridge($lti->toolurl, $lti);
}
}
/**
* Determines if the given url is for a IMS basic cartridge
*
* @param string $url The url to be checked
* @return True if the url is for a cartridge
* @since Moodle 3.1
*/
function lti_is_cartridge($url) {
// If it is empty, it's not a cartridge.
if (empty($url)) {
return false;
}
// If it has xml at the end of the url, it's a cartridge.
if (preg_match('/\.xml$/', $url)) {
return true;
}
// Even if it doesn't have .xml, load the url to check if it's a cartridge..
try {
$toolinfo = lti_load_cartridge($url,
array(
"launch_url" => "launchurl"
)
);
if (!empty($toolinfo['launchurl'])) {
return true;
}
} catch (moodle_exception $e) {
return false; // Error loading the xml, so it's not a cartridge.
}
return false;
}
/**
* Allows you to load settings for an external tool type from an IMS cartridge.
*
* @param string $url The URL to the cartridge
* @param stdClass $type The tool type object to be filled in
* @throws moodle_exception if the cartridge could not be loaded correctly
* @since Moodle 3.1
*/
function lti_load_type_from_cartridge($url, $type) {
$toolinfo = lti_load_cartridge($url,
array(
"title" => "lti_typename",
"launch_url" => "lti_toolurl",
"description" => "lti_description",
"icon" => "lti_icon",
"secure_icon" => "lti_secureicon"
),
array(
"icon_url" => "lti_extension_icon",
"secure_icon_url" => "lti_extension_secureicon"
)
);
// If an activity name exists, unset the cartridge name so we don't override it.
if (isset($type->lti_typename)) {
unset($toolinfo['lti_typename']);
}
// Always prefer cartridge core icons first, then, if none are found, look at the extension icons.
if (empty($toolinfo['lti_icon']) && !empty($toolinfo['lti_extension_icon'])) {
$toolinfo['lti_icon'] = $toolinfo['lti_extension_icon'];
}
unset($toolinfo['lti_extension_icon']);
if (empty($toolinfo['lti_secureicon']) && !empty($toolinfo['lti_extension_secureicon'])) {
$toolinfo['lti_secureicon'] = $toolinfo['lti_extension_secureicon'];
}
unset($toolinfo['lti_extension_secureicon']);
// Ensure Custom icons aren't overridden by cartridge params.
if (!empty($type->lti_icon)) {
unset($toolinfo['lti_icon']);
}
if (!empty($type->lti_secureicon)) {
unset($toolinfo['lti_secureicon']);
}
foreach ($toolinfo as $property => $value) {
$type->$property = $value;
}
}
/**
* Allows you to load in the configuration for an external tool from an IMS cartridge.
*
* @param string $url The URL to the cartridge
* @param stdClass $lti LTI object
* @throws moodle_exception if the cartridge could not be loaded correctly
* @since Moodle 3.1
*/
function lti_load_tool_from_cartridge($url, $lti) {
$toolinfo = lti_load_cartridge($url,
array(
"title" => "name",
"launch_url" => "toolurl",
"secure_launch_url" => "securetoolurl",
"description" => "intro",
"icon" => "icon",
"secure_icon" => "secureicon"
),
array(
"icon_url" => "extension_icon",
"secure_icon_url" => "extension_secureicon"
)
);
// If an activity name exists, unset the cartridge name so we don't override it.
if (isset($lti->name)) {
unset($toolinfo['name']);
}
// Always prefer cartridge core icons first, then, if none are found, look at the extension icons.
if (empty($toolinfo['icon']) && !empty($toolinfo['extension_icon'])) {
$toolinfo['icon'] = $toolinfo['extension_icon'];
}
unset($toolinfo['extension_icon']);
if (empty($toolinfo['secureicon']) && !empty($toolinfo['extension_secureicon'])) {
$toolinfo['secureicon'] = $toolinfo['extension_secureicon'];
}
unset($toolinfo['extension_secureicon']);
foreach ($toolinfo as $property => $value) {
$lti->$property = $value;
}
}
/**
* Search for a tag within an XML DOMDocument
*
* @param string $url The url of the cartridge to be loaded
* @param array $map The map of tags to keys in the return array
* @param array $propertiesmap The map of properties to keys in the return array
* @return array An associative array with the given keys and their values from the cartridge
* @throws moodle_exception if the cartridge could not be loaded correctly
* @since Moodle 3.1
*/
function lti_load_cartridge($url, $map, $propertiesmap = array()) {
global $CFG;
require_once($CFG->libdir. "/filelib.php");
$curl = new curl();
$response = $curl->get($url);
// TODO MDL-46023 Replace this code with a call to the new library.
$origerrors = libxml_use_internal_errors(true);
$origentity = libxml_disable_entity_loader(true);
libxml_clear_errors();
$document = new DOMDocument();
@$document->loadXML($response, LIBXML_DTDLOAD | LIBXML_DTDATTR);
$cartridge = new DomXpath($document);
$errors = libxml_get_errors();
libxml_clear_errors();
libxml_use_internal_errors($origerrors);
libxml_disable_entity_loader($origentity);
if (count($errors) > 0) {
$message = 'Failed to load cartridge.';
foreach ($errors as $error) {
$message .= "\n" . trim($error->message, "\n\r\t .") . " at line " . $error->line;
}
throw new moodle_exception('errorreadingfile', '', '', $url, $message);
}
$toolinfo = array();
foreach ($map as $tag => $key) {
$value = get_tag($tag, $cartridge);
if ($value) {
$toolinfo[$key] = $value;
}
}
if (!empty($propertiesmap)) {
foreach ($propertiesmap as $property => $key) {
$value = get_tag("property", $cartridge, $property);
if ($value) {
$toolinfo[$key] = $value;
}
}
}
return $toolinfo;
}
/**
* Search for a tag within an XML DOMDocument
*
* @param stdClass $tagname The name of the tag to search for
* @param XPath $xpath The XML to find the tag in
* @param XPath $attribute The attribute to search for (if we should search for a child node with the given
* value for the name attribute
* @since Moodle 3.1
*/
function get_tag($tagname, $xpath, $attribute = null) {
if ($attribute) {
$result = $xpath->query('//*[local-name() = \'' . $tagname . '\'][@name="' . $attribute . '"]');
} else {
$result = $xpath->query('//*[local-name() = \'' . $tagname . '\']');
}
if ($result->length > 0) {
return $result->item(0)->nodeValue;
}
return null;
}
/**
* Create a new access token.
*
* @param int $typeid Tool type ID
* @param string[] $scopes Scopes permitted for new token
*
* @return stdClass Access token
*/
function lti_new_access_token($typeid, $scopes) {
global $DB;
// Make sure the token doesn't exist (even if it should be almost impossible with the random generation).
$numtries = 0;
do {
$numtries ++;
$generatedtoken = md5(uniqid(rand(), 1));
if ($numtries > 5) {
throw new moodle_exception('Failed to generate LTI access token');
}
} while ($DB->record_exists('lti_access_tokens', array('token' => $generatedtoken)));
$newtoken = new stdClass();
$newtoken->typeid = $typeid;
$newtoken->scope = json_encode(array_values($scopes));
$newtoken->token = $generatedtoken;
$newtoken->timecreated = time();
$newtoken->validuntil = $newtoken->timecreated + LTI_ACCESS_TOKEN_LIFE;
$newtoken->lastaccess = null;
$DB->insert_record('lti_access_tokens', $newtoken);
return $newtoken;
}