public function handle($data)
{
$this->validate_request(["group-name"]);
$groupname = $data->{"group-name"};
$displayname = $groupname;
if (isset($data->{"display-name"})) {
$displayname = $data->{"display-name"};
}
if (GroupBackend::group_exists($groupname)) {
throw new EndpointExecutionException("Group with name already exists", ["group-name", $groupname]);
}
// Add the group to the database
$group = GroupBackend::create_group($groupname, $displayname);
// Return the new user to the client
return ["group" => $group->toExternalForm()];
}