/**
* 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;
}
/**
* Creates a new tool proxy
*
* @param string $name Tool proxy name
* @param string $registrationurl Registration url
* @param string[] $capabilityoffered List of capabilities this tool proxy should be offered
* @param string[] $serviceoffered List of services this tool proxy should be offered
* @return object The new tool proxy
* @since Moodle 3.1
* @throws moodle_exception
*/
public static function create_tool_proxy($name, $registrationurl, $capabilityoffered, $serviceoffered)
{
$params = self::validate_parameters(self::create_tool_proxy_parameters(), array('name' => $name, 'regurl' => $registrationurl, 'capabilityoffered' => $capabilityoffered, 'serviceoffered' => $serviceoffered));
$name = $params['name'];
$regurl = $params['regurl'];
$capabilityoffered = $params['capabilityoffered'];
$serviceoffered = $params['serviceoffered'];
$context = context_system::instance();
self::validate_context($context);
require_capability('moodle/site:config', $context);
// Can't create duplicate proxies with the same URL.
$duplicates = lti_get_tool_proxies_from_registration_url($registrationurl);
if (!empty($duplicates)) {
throw new moodle_exception('duplicateregurl', 'mod_lti');
}
$config = new stdClass();
$config->lti_registrationurl = $registrationurl;
if (!empty($name)) {
$config->lti_registrationname = $name;
}
if (!empty($capabilityoffered)) {
$config->lti_capabilities = $capabilityoffered;
}
if (!empty($serviceoffered)) {
$config->lti_services = $serviceoffered;
}
$id = lti_add_tool_proxy($config);
$toolproxy = lti_get_tool_proxy($id);
// Pending makes more sense than configured as the first state, since
// the next step is to register, which requires the state be pending.
$toolproxy->state = LTI_TOOL_PROXY_STATE_PENDING;
lti_update_tool_proxy($toolproxy);
return $toolproxy;
}
/**
* Execute the request for this resource.
*
* @param mod_lti\local\ltiservice\response $response Response object for this request.
*/
public function execute($response)
{
$ok = $this->check_tool_proxy(null, $response->get_request_data());
if ($ok) {
$toolproxy = $this->get_service()->get_tool_proxy();
} else {
$toolproxy = null;
$response->set_code(401);
}
$tools = array();
// Ensure all required elements are present in the Tool Proxy.
if ($ok) {
$toolproxyjson = json_decode($response->get_request_data());
$ok = !empty($toolproxyjson);
if (!$ok) {
debugging('Tool proxy is not properly formed JSON');
} else {
$ok = isset($toolproxyjson->tool_profile->product_instance->product_info->product_family->vendor->code);
$ok = $ok && isset($toolproxyjson->security_contract->shared_secret);
$ok = $ok && isset($toolproxyjson->tool_profile->resource_handler);
if (!$ok) {
debugging('One or more missing elements from tool proxy: vendor code, shared secret or resource handlers');
}
}
}
// Check all capabilities requested were offered.
if ($ok) {
$offeredcapabilities = explode("\n", $toolproxy->capabilityoffered);
$resources = $toolproxyjson->tool_profile->resource_handler;
$errors = array();
foreach ($resources as $resource) {
if (isset($resource->message)) {
foreach ($resource->message as $message) {
if (!in_array($message->message_type, $offeredcapabilities)) {
$errors[] = $message->message_type;
} else {
if (isset($resource->parameter)) {
foreach ($message->parameter as $parameter) {
if (isset($parameter->variable) && !in_array($parameter->variable, $offeredcapabilities)) {
$errors[] = $parameter->variable;
}
}
}
}
}
}
}
if (count($errors) > 0) {
$ok = false;
debugging('Tool proxy contains capabilities which were not offered: ' . implode(', ', $errors));
}
}
// Check all services requested were offered (only tool services currently supported).
if ($ok && isset($toolproxyjson->security_contract->tool_service)) {
$contexts = lti_get_contexts($toolproxyjson);
$profileservice = lti_get_service_by_name('profile');
$profileservice->set_tool_proxy($toolproxy);
$context = $profileservice->get_service_path() . $profileservice->get_resources()[0]->get_path() . '#';
$offeredservices = explode("\n", $toolproxy->serviceoffered);
$services = lti_get_services();
$tpservices = $toolproxyjson->security_contract->tool_service;
$errors = array();
foreach ($tpservices as $service) {
$fqid = lti_get_fqid($contexts, $service->service);
if (substr($fqid, 0, strlen($context)) !== $context) {
$errors[] = $service->service;
} else {
$id = explode('#', $fqid, 2);
$aservice = lti_get_service_by_resource_id($services, $id[1]);
$classname = explode('\\', get_class($aservice));
if (empty($aservice) || !in_array($classname[count($classname) - 1], $offeredservices)) {
$errors[] = $service->service;
}
}
}
if (count($errors) > 0) {
$ok = false;
debugging('Tool proxy contains services which were not offered: ' . implode(', ', $errors));
}
}
// Extract all launchable tools from the resource handlers.
if ($ok) {
$resources = $toolproxyjson->tool_profile->resource_handler;
foreach ($resources as $resource) {
$found = false;
$tool = new \stdClass();
foreach ($resource->message as $message) {
if ($message->message_type == 'basic-lti-launch-request') {
$found = true;
$tool->path = $message->path;
$tool->enabled_capability = $message->enabled_capability;
$tool->parameter = $message->parameter;
break;
}
}
if (!$found) {
continue;
}
$tool->name = $resource->resource_name->default_value;
$tools[] = $tool;
}
$ok = count($tools) > 0;
if (!$ok) {
debugging('No launchable messages found in tool proxy');
}
}
// Add tools and custom parameters.
if ($ok) {
$baseurl = '';
if (isset($toolproxyjson->tool_profile->base_url_choice[0]->default_base_url)) {
$baseurl = $toolproxyjson->tool_profile->base_url_choice[0]->default_base_url;
}
$securebaseurl = '';
if (isset($toolproxyjson->tool_profile->base_url_choice[0]->secure_base_url)) {
$securebaseurl = $toolproxyjson->tool_profile->base_url_choice[0]->secure_base_url;
}
foreach ($tools as $tool) {
$config = new \stdClass();
$config->lti_toolurl = "{$baseurl}{$tool->path}";
$config->lti_typename = $tool->name;
$config->lti_coursevisible = 1;
$config->lti_forcessl = 0;
$type = new \stdClass();
$type->state = LTI_TOOL_STATE_PENDING;
$type->toolproxyid = $toolproxy->id;
$type->enabledcapability = implode("\n", $tool->enabled_capability);
$type->parameter = self::lti_extract_parameters($tool->parameter);
if (isset($resource->icon_info[0]->default_location->path)) {
$iconpath = $resource->icon_info[0]->default_location->path;
$type->icon = "{$baseurl}{$iconpath}";
if (!empty($securebaseurl)) {
$type->secureicon = "{$securebaseurl}{$iconpath}";
}
}
$ok = $ok && lti_add_type($type, $config) !== false;
}
if (isset($toolproxyjson->custom)) {
lti_set_tool_settings($toolproxyjson->custom, $toolproxy->id);
}
}
if (!empty($toolproxy)) {
if ($ok) {
// If all went OK accept the tool proxy.
$toolproxy->state = LTI_TOOL_PROXY_STATE_ACCEPTED;
$toolproxy->toolproxy = $response->get_request_data();
$toolproxy->secret = $toolproxyjson->security_contract->shared_secret;
$toolproxy->vendorcode = $toolproxyjson->tool_profile->product_instance->product_info->product_family->vendor->code;
$url = $this->get_endpoint();
$body = <<<EOD
{
"@context" : "http://purl.imsglobal.org/ctx/lti/v2/ToolProxyId",
"@type" : "ToolProxy",
"@id" : "{$url}",
"tool_proxy_guid" : "{$toolproxy->guid}"
}
EOD;
$response->set_code(201);
$response->set_content_type('application/vnd.ims.lti.v2.toolproxy.id+json');
$response->set_body($body);
} else {
// Otherwise reject the tool proxy.
$toolproxy->state = LTI_TOOL_PROXY_STATE_REJECTED;
$response->set_code(400);
}
lti_update_tool_proxy($toolproxy);
} else {
$response->set_code(400);
}
}
}
if (!empty($id)) {
$params['id'] = $id;
}
$redirect = new moodle_url('/mod/lti/registrationreturn.php', $params);
$redirect = $redirect->out(false);
redirect($redirect, $err);
} else {
$redirect = new moodle_url('/mod/lti/toolproxies.php');
if (!empty($id)) {
$toolproxy = $DB->get_record('lti_tool_proxies', array('id' => $id));
switch ($toolproxy->state) {
case LTI_TOOL_PROXY_STATE_ACCEPTED:
$redirect->param('tab', 'tp_accepted');
break;
case LTI_TOOL_PROXY_STATE_REJECTED:
$redirect->param('tab', 'tp_rejected');
break;
case LTI_TOOL_PROXY_STATE_PENDING:
// Change the status to configured.
$toolproxy->state = LTI_TOOL_PROXY_STATE_CONFIGURED;
lti_update_tool_proxy($toolproxy);
}
}
$redirect = $redirect->out();
if (empty($msg)) {
$msg = $err;
}
redirect($redirect, $msg);
}
}
public function execute($response) {
$ok = $this->get_service()->check_tool_proxy(null, $response->get_request_data());
$toolproxy = $this->get_service()->get_tool_proxy();
if ($ok) {
$toolproxyjson = json_decode($response->get_request_data());
$ok = !is_null($toolproxyjson);
$ok = $ok && isset($toolproxyjson->tool_profile->product_instance->product_info->product_family->vendor->code);
$ok = $ok && isset($toolproxyjson->security_contract->shared_secret);
$ok = $ok && isset($toolproxyjson->tool_profile->resource_handler);
}
if ($ok) {
$baseurl = '';
if (isset($toolproxyjson->tool_profile->base_url_choice[0]->default_base_url)) {
$baseurl = $toolproxyjson->tool_profile->base_url_choice[0]->default_base_url;
}
$securebaseurl = '';
if (isset($toolproxyjson->tool_profile->base_url_choice[0]->secure_base_url)) {
$securebaseurl = $toolproxyjson->tool_profile->base_url_choice[0]->secure_base_url;
}
$resources = $toolproxyjson->tool_profile->resource_handler;
foreach ($resources as $resource) {
$icon = new \stdClass();
if (isset($resource->icon_info[0]->default_location->path)) {
$icon->path = $resource->icon_info[0]->default_location->path;
}
$tool = new \stdClass();
$tool->name = $resource->resource_name->default_value;
$messages = $resource->message;
foreach ($messages as $message) {
if ($message->message_type == 'basic-lti-launch-request') {
$tool->path = $message->path;
$tool->enabled_capability = $message->enabled_capability;
$tool->parameter = $message->parameter;
}
}
$config = new \stdClass();
$config->lti_toolurl = "{$baseurl}{$tool->path}";
$config->lti_typename = $tool->name;
$config->lti_coursevisible = 1;
$config->lti_forcessl = 0;
$type = new \stdClass();
$type->state = LTI_TOOL_STATE_PENDING;
$type->toolproxyid = $toolproxy->id;
$type->enabledcapability = implode("\n", $tool->enabled_capability);
$type->parameter = self::lti_extract_parameters($tool->parameter);
if (!empty($icon->path)) {
$type->icon = "{$baseurl}{$icon->path}";
if (!empty($securebaseurl)) {
$type->secureicon = "{$securebaseurl}{$icon->path}";
}
}
$ok = (lti_add_type($type, $config) !== false);
}
if (isset($toolproxyjson->custom)) {
lti_set_tool_settings($toolproxyjson->custom, $toolproxy->id);
}
}
if ($ok) {
$toolproxy->state = LTI_TOOL_PROXY_STATE_ACCEPTED;
$toolproxy->toolproxy = $response->get_request_data();
$toolproxy->secret = $toolproxyjson->security_contract->shared_secret;
$toolproxy->vendorcode = $toolproxyjson->tool_profile->product_instance->product_info->product_family->vendor->code;
$url = $this->get_endpoint();
$body = <<< EOD
{
"@context" : "http://purl.imsglobal.org/ctx/lti/v2/ToolProxyId",
"@type" : "ToolProxy",
"@id" : "{$url}",
"tool_proxy_guid" : "{$toolproxy->guid}"
}
EOD;
$response->set_code(201);
$response->set_content_type('application/vnd.ims.lti.v2.toolproxy.id+json');
$response->set_body($body);
} else {
$toolproxy->state = LTI_TOOL_PROXY_STATE_REJECTED;
$response->set_code(400);
}
lti_update_tool_proxy($toolproxy);
}
