session_required();
Response::send(Database::get_list_of_users_who_have_added_user($_SESSION['id']));
break;
// word lists
// add word list
// word lists
// add word list
case 'add-word-list':
session_required();
Response::send(Database::add_word_list($_SESSION['id'], Validation::format_text($_GET['name'])));
break;
// list of word lists
// list of word lists
case 'list-of-word-lists':
session_required();
Response::send(Database::get_word_lists_of_user($_SESSION['id']));
break;
// list of shared word lists with user
// list of shared word lists with user
case 'list-of-shared-word-lists-with-user':
session_required();
Response::send(Database::get_list_of_shared_word_lists_with_user($_SESSION['id']));
break;
// get word list
// get word list
case 'get-word-list':
session_required();
$res = Database::get_word_list($_SESSION['id'], Validation::format_text($_GET['word_list_id']), true);
if ($res !== NULL) {
// list is null if it doesn't exist of has been deleted
// stores whether the requesting unser is the list creator
