SpreadQuiz/interface.php

829 lines
26 KiB
PHP

<?php
require_once "check_maintenance.php";
//ini_set('display_startup_errors', '1');
require_once "globals.php";
require_once "privilege_levels.php";
if (!file_exists(INSTALL_INDICATOR)) {
exit();
}
if (!isset($_REQUEST["action"])) {
exit();
}
require_once "common_func.php";
require_once "class/ReqHandler.php";
require_once "class/UserMgr.php";
require_once "class/GroupMgr.php";
require_once "class/GameMgr.php";
require_once "class/TestMgr.php";
require_once "class/ReportBuilder.php";
// ------------------------
$userMgr = new UserMgr();
// ------------------------
$result = "";
$success = false;
// user-related variables
$user = null;
$nickname = "";
$privilege = PRIVILEGE_NONE;
// --------
// create request handler
$rh = new ReqHandler();
// action dump callback
function dump_actions(ReqHandler &$rh, array $params): string
{
return $rh->dump_actions();
}
$rh->add("dump_actions", [], PRIVILEGE_QUIZMASTER, "dump_actions", RESP_PLAIN, "Dump all registered actions.");
/* ------------ ACTIONS AVAILABLE WITHOUT LOGGING IN ---------- */
// login the user
function login(ReqHandler &$rh, array $params): string
{
global $userMgr;
global $user;
$nickname = $params["nickname"];
$password = $params["password"];
$user = $userMgr->getUser($nickname);
if (($user !== null) && $user->checkPassword($password)) {
session_start();
$_SESSION["nickname"] = $nickname;
$result = "OK";
} else {
$result = "FAIL";
}
return $result;
}
$rh->add("login", ["nickname", "password"], PRIVILEGE_NONE, "login", RESP_PLAIN, "Log in the user.");
// exit script if there's no live session or nickname is missing or the referenced user is non-existent
if ((session_status() != PHP_SESSION_ACTIVE) || (!isset($_SESSION["nickname"])) || ($userMgr->getUser($_SESSION["nickname"]) === null)) {
goto process_and_print;
}
$user = $userMgr->getUser($_SESSION["nickname"]);
$nickname = $user->getNickname();
$privilege = $user->getPrivilege();
$groupMgr = new GroupMgr();
$gameMgr = new GameMgr();
$testMgr = new TestMgr();
/* ---------- ACTIONS REQUIRING BEING LOGGED IN ------------ */
function logout(ReqHandler &$rh, array $params): string
{
$_SESSION = []; // clean up session data
setcookie(SESSION_NAME, "", -1); // invalidate cookie
return "OK";
}
function get_user_info(ReqHandler &$rh, array $params): array
{
global $user;
$user_data_filtered = $user->toArray();
unset($user_data_filtered["password"]);
return $user_data_filtered;
}
function get_available_games(ReqHandler &$rh, array $params): array
{
global $user;
global $groupMgr;
global $gameMgr;
$games_by_groups = [];
$groupids = $groupMgr->getUserGroupIDs($user->getNickname());
foreach ($groupids as $groupid) {
$group = $groupMgr->getGroup($groupid);
$game_collection = [
"groupname" => $group->getName(),
"description" => $group->getDescription(),
"games" => []
];
$gameids = $group->getGames();
foreach ($gameids as $gameid) {
$game = $gameMgr->getGame($gameid);
if ($game->isGameFileIsPresent()) {
$a = $game->toArray(Game::OMIT_ADVANCED_FIELDS);
$game_collection["games"][] = $a;
}
}
$games_by_groups[] = $game_collection;
}
return $games_by_groups;
}
function start_or_continue_test(ReqHandler &$rh, array $params): string
{
global $user;
global $gameMgr;
global $testMgr;
global $groupMgr;
if ($groupMgr->doesUserAccessGame($params["gameid"], $user->getNickname())) {
$game = $gameMgr->getGame($params["gameid"]);
$test = $testMgr->addOrContinueTest($game, $user);
return $test->getId();
} else {
return -1;
}
}
function get_results_overview(ReqHandler &$rh, array $params): array
{
global $user;
global $testMgr;
$concluded_tests = $testMgr->getConcludedTests($params["gameid"], $user->getNickname());
$overviews = [];
foreach ($concluded_tests as $ct) {
$overview = [
"testid" => $ct->getId(),
"start_time" => $ct->getStartTime(),
"end_time" => $ct->getEndTime(),
...($ct->getSummary()->toArray())
];
$overviews[] = $overview;
}
return $overviews;
}
function change_password(ReqHandler &$rh, array $params): string
{
$oldpass = $params["oldpass"];
$newpass = $params["newpass"];
global $user;
$success = $user->changePassword($newpass, $oldpass);
return $success ? "OK" : "FAIL";
}
$rh->add("logout", [], PRIVILEGE_PLAYER, "logout", RESP_PLAIN, "Log out the user.");
$rh->add("change_password", ["oldpass", "newpass"], PRIVILEGE_PLAYER, "change_password", RESP_PLAIN, "Change users password.");
$rh->add("get_user_info", [], PRIVILEGE_PLAYER, "get_user_info", RESP_JSON, "Get user information.");
$rh->add("get_available_games", [], PRIVILEGE_PLAYER, "get_available_games", RESP_JSON, "Get available games to the player.");
$rh->add("start_or_continue_test", ["gameid"], PRIVILEGE_PLAYER, "start_or_continue_test", RESP_PLAIN, "Start new or continue an ongoing test.");
$rh->add("get_results_overview", ["gameid"], PRIVILEGE_PLAYER, "get_results_overview", RESP_JSON, "Get a quick overview of player's results of a single game.");
// test-related queries
function does_test_belong_to_user(Test &$test): bool
{
global $user;
return $test->getNickname() === $user->getNickname();
}
function is_test_access_approved(Test &$test): bool
{
global $user;
global $gameMgr;
$game = $gameMgr->getGame($test->getGameId());
return does_test_belong_to_user($test) || $game->isUserContributorOrOwner($user->getNickname()) || $user->hasQuizmasterPrivilege();
}
function access_test_data(string $testid): Test|null
{
global $testMgr;
$testid = trim($testid);
$test = ($testid !== "") ? $testMgr->getTest($testid) : null;
// fetch test data
if ($test === null) {
return null;
}
// check if access is approved to the specific test
if (!is_test_access_approved($test)) {
return null;
}
// update the test if timed
// update_timed_tests([$test_data]); FIXME!!!
return $test;
}
function exclude_correct_answers(array &$challenges): void
{
foreach ($challenges as &$challenge) {
$challenge["correct_answer"] = -1;
}
}
function get_player_test(ReqHandler &$rh, array $params): array
{
$result = [];
$test = access_test_data($params["testid"]);
if ($test !== null) {
$test_data_with_current_time = $test->toArray();
if ($test->isOngoing()) {
exclude_correct_answers($test_data_with_current_time["challenges"]);
}
$test_data_with_current_time["current_time"] = time();
$result = $test_data_with_current_time;
}
return $result;
}
function save_player_answer(ReqHandler &$rh, array $params): string
{
$test = access_test_data($params["testid"]);
if ($test !== null) {
$test->saveAnswer($params["challenge_index"], $params["answer_index"]);
return "OK";
} else {
return "FAIL";
}
}
function submit_test(ReqHandler &$rh, array $params): string
{
$test = access_test_data($params["testid"]);
if ($test !== null) {
$test->concludeTest();
return "OK";
} else {
return "FAIL";
}
}
function patch_through_image(string $gameid, string $img_url)
{
global $gameMgr;
$game_dir = $gameMgr->getGame($gameid)->getGameDir();
$image_fetch_url = $game_dir . DIRECTORY_SEPARATOR . $img_url;
$img_fp = fopen($image_fetch_url, "r");
if ($img_fp === false) {
$img_fp = fopen(MISSING_IMAGE_PLACEHOLDER, "r");
}
fpassthru($img_fp);
fclose($img_fp);
}
function get_image(ReqHandler &$rh, array $params): string
{
$img_url = trim($params["img_url"] ?? "");
if ($img_url !== "") {
$gameid = $params["gameid"];
patch_through_image($gameid, $img_url);
}
return "";
}
$rh->add("get_test", ["testid"], PRIVILEGE_PLAYER, "get_player_test", RESP_JSON, "Get player's test by ID.");
$rh->add("save_answer", ["testid", "challenge_index", "answer_index"], PRIVILEGE_PLAYER, "save_player_answer", RESP_PLAIN, "Store player's answer.");
$rh->add("submit_test", ["testid"], PRIVILEGE_PLAYER, "submit_test", RESP_PLAIN, "Finish player's test.");
$rh->add("get_image", ["gameid", "img_url"], PRIVILEGE_PLAYER, "get_image", RESP_NONE, "Get image per game.");
// execute query if user has the player privilege level
if ($privilege === PRIVILEGE_PLAYER) {
goto process_and_print;
}
/* --------------- CREATOR LEVEL ACTIONS ---------------- */
$requester_nickname = $user->hasQuizmasterPrivilege() ? "*" : $nickname; // "*" means every game
function create_update_game(ReqHandler &$rh, array $params): array
{
global $user;
global $nickname;
global $gameMgr;
$update = $params[ReqHandler::ACTION_KEY] === "update_game";
$data = json_decode($params["data"], true) ?? [];
if (($data === []) || (trim($data["name"] ?? "") === "")) { // no further processing
return []; // ~exit...
}
// fetch fields
$gameid = $data["_id"];
$name = $data["name"];
$description = $data["description"];
$contributors = explode_list($data["contributors"] ?? "");
$owner = $update ? trim($data["owner"] ?? $nickname) : $nickname;
$properties = $data["properties"] ?? [];
// result
$result = [];
// create or update
if (!$update) { // CREATE
$gameMgr->addGame($name, $owner, $description);
} else { // UPDATE
$game = $gameMgr->getGame($gameid); // fetch game
if (($game !== null) && $game->isUserContributorOrOwner($nickname) || $user->hasQuizmasterPrivilege()) {
// disable autostoring
$game->disableAutoStoring();
// update game header data
$game->setName($name);
$game->setDescription($description);
if ($game->isUserOwner($nickname) || $user->hasQuizmasterPrivilege()) {
$game->setOwner($owner);
}
$game->setContributors($contributors);
$game->setProperties($properties);
// process game public flag: a game might be only public if not being time-constrained and is allowed to be taken multiple times
$public = ($properties["time_limit"] !== 0) || (!$properties["repeatable"]) ? false : $data["public"];
$game->setPublic($public);
// store modifications
$game->storeMods();
// re-enable auto-storing
$game->enableAutoStoring();
// update game file if supplied
if (isset($_FILES["game_file"])) {
// decide weather it's a package or a plain table
$file = $_FILES["game_file"];
$challenge_import_status = [];
// determine MIME type
$file_type = strtolower(pathinfo($file["name"], PATHINFO_EXTENSION));
if ($file_type === "zip") { // a package was uploaded
$zip = new ZipArchive;
if ($zip->open($file["tmp_name"])) {
$game_dir = $game->getGameDir(); // get game directory
//$game_files = glob($game_dir); // get list of existing game files
// remove former files recursively
$dir_iter = new RecursiveDirectoryIterator($game_dir, FilesystemIterator::SKIP_DOTS);
foreach ($dir_iter as $dir_item) {
$item_path = $dir_item->getPathname();
$dir_item->isDir() ? rmdir($item_path) : unlink($item_path);
}
// extract package contents to the game directory
$zip->extractTo($game_dir . DIRECTORY_SEPARATOR);
// search for the CSV table file
$csv_files = glob($game_dir . DIRECTORY_SEPARATOR . "*.csv") ?? [];
if (count($csv_files) > 0) {
$challenge_import_status = $game->importChallengesFromCSV($csv_files[0]);
}
}
} else if ($file_type === "csv") { // a plain table was uploaded
$challenge_import_status = $game->importChallengesFromCSV($file["tmp_name"]);
}
$result = $challenge_import_status;
}
}
}
return $result;
}
function get_all_game_headers(ReqHandler &$rh, array $params): array
{
global $requester_nickname;
global $gameMgr;
$games = $gameMgr->getAllGameDataByContributor($requester_nickname);
$a = [];
foreach ($games as &$game) {
$a[] = $game->toArray();
}
return $a;
}
function get_challenges(ReqHandler &$rh, array $params): string
{
global $user;
global $gameMgr;
$gameid = $params["gameid"];
$game = $gameMgr->getGame($gameid);
$result = "";
if (($game !== null) && ($user->hasQuizmasterPrivilege() || ($game->isUserContributorOrOwner($user->getNickname())))) {
$result = file_get_contents($game->getGameFile());
}
return $result;
}
function delete_games(ReqHandler &$rh, array $params): string
{
global $user;
global $gameMgr;
$gameids = explode_list(trim($params["ids"]));
foreach ($gameids as $gameid) {
$game = $gameMgr->getGame($gameid);
if (($game !== null) && ($game->isUserOwner($user->getNickname()))) { // only the owner may delete a game
$gameMgr->deleteGame($gameid);
}
}
return "OK";
}
function export_game_file_csv(ReqHandler &$rh, array $params): string
{
global $user;
global $gameMgr;
$gameid = trim($params["gameid"]);
$game = $gameMgr->getGame($gameid);
if (($game !== null) && ($game->isUserContributorOrOwner($user->getNickname()) || $user->hasQuizmasterPrivilege())) {
$f = tmpfile();
header("Content-Type: text/csv");
header("Content-Disposition: attachment; filename=\"challenges_$gameid.csv\"\r\n");
$game->exportChallengesToCSV($f);
fseek($f, 0);
fpassthru($f);
}
return "";
}
function get_results_by_gameid(ReqHandler &$rh, array $params): array
{
global $gameMgr;
global $testMgr;
global $user;
$gameid = trim($params["gameid"]);
$filter = trim($params["filter"] ?? "");
$ordering = trim($params["orderby"] ?? "");
$groups = explode_list(trim($params["groups"] ?? ""));
$game = $gameMgr->getGame($gameid);
$result = [];
if (($game !== null) && ($game->isUserContributorOrOwner($user->getNickname()) || $user->hasQuizmasterPrivilege())) {
// creating filter criteria on groups
$group_filter = [];
if ($groups !== []) {
global $groupMgr;
$n = 0;
foreach ($groups as $groupname) {
$group = $groupMgr->getGroupByUniqueName($groupname);
if ($group !== null) {
if ($n > 0) { // place OR between each group criterion
$group_filter[] = "OR";
}
$nicknames = $group->getMembers();
$group_filter[] = ["nickname", "IN", $nicknames];
$n++;
} else { // a group not found means a faulty query
return [];
}
}
}
// execute filtering
$game_results = null;
if ($group_filter !== []) {
$game_results = $testMgr->getResultsByGameId($gameid, $filter, $ordering, true, $group_filter);
} else {
$game_results = $testMgr->getResultsByGameId($gameid, $filter, $ordering, true);
}
$result = $game_results;
}
return $result;
}
function generate_report_by_groups(ReqHandler &$rh, array $params): string
{
global $gameMgr;
global $user;
$gameid = trim($params["gameid"]);
$filter = trim($params["filter"] ?? "");
$groups = explode_list(trim($params["groups"])); // TODO: lehessen több csoportra is
$game = $gameMgr->getGame($gameid);
// verify game and access
if (($game === null) || (!$game->isUserContributorOrOwner($user->getNickname()) || !$user->hasQuizmasterPrivilege())) {
return "FAIL";
}
// assemble report
$report = new Report($game->getName());
foreach ($groups as $groupname) {
$stats = ReportBuilder::getStatsByFilters($gameid, $filter, $groupname, "");
$section = new ReportSection($groupname, $stats);
$report->addSection($section);
}
// generate latex
$report_dir = "report";
$report->saveTeX($report_dir . DIRECTORY_SEPARATOR . "stats");
// run LuaLaTeX twice
chdir($report_dir);
$tex_cmd = "lualatex -interaction=nonstopmode report.tex";
exec($tex_cmd);
exec($tex_cmd);
$output = "report.pdf";
header("Content-Type: application/pdf");
header("Content-Length: " . filesize($output));
// deploy the generated PDF
$pdf = fopen($output, "r");
if ($pdf !== false) {
fpassthru($pdf);
fclose($pdf);
}
return "OK";
}
function generate_detailed_game_stats(ReqHandler &$rh, array $params): array
{
global $testMgr;
$testids = json_decode(trim($params["testids"]), true);
$gameid = trim($params["gameid"]);
$stats = $testMgr->generateDetailedStats($gameid, $testids);
return $stats;
}
function delete_tests(ReqHandler &$rh, array $params): string
{
global $testMgr;
$ids = explode_list(trim($params["ids"]));
foreach ($ids as $id) {
$testMgr->deleteTest($id);
}
return "OK";
}
$rh->add(["create_game", "update_game"], ["data"], PRIVILEGE_CREATOR, "create_update_game", RESP_JSON, "Create or update game.");
$rh->add("get_all_game_headers", [], PRIVILEGE_CREATOR, "get_all_game_headers", RESP_JSON, "Get all game headers.");
$rh->add("get_challenges", [], PRIVILEGE_CREATOR, "get_challenges", RESP_PLAIN, "Get game challenges.");
$rh->add("delete_games", ["ids"], PRIVILEGE_CREATOR, "delete_games", RESP_PLAIN, "Delete games.");
$rh->add("export_game_file_csv", ["gameid"], PRIVILEGE_CREATOR, "export_game_file_csv", RESP_NONE, "Export game CSV file.");
$rh->add("get_results_by_gameid", ["gameid"], PRIVILEGE_CREATOR, "get_results_by_gameid", RESP_JSON, "Get game results.");
$rh->add("generate_detailed_stats", ["gameid", "testids"], PRIVILEGE_CREATOR, "generate_detailed_game_stats", RESP_JSON, "Generate detailed game stats.");
$rh->add("generate_report_by_groups", ["gameid", "groups"], PRIVILEGE_CREATOR, "generate_report_by_groups", RESP_NONE, "Generate game reports for each specified group.");
$rh->add("delete_tests", ["ids"], PRIVILEGE_CREATOR, "delete_tests", RESP_PLAIN, "Delete tests.");
// execute processing if user is a creator
if ($privilege === PRIVILEGE_CREATOR) {
goto process_and_print;
}
/* ------------------------ QUIZMASTER ACTIONS --------------------- */
function create_update_group(ReqHandler &$rh, array $params): string
{
global $user;
global $groupMgr;
global $userMgr;
$update = $params[ReqHandler::ACTION_KEY] === "update_group";
$groupname = trim($params["groupname"]);
$description = trim($params["description"]);
$editors = (!$update) ? [] : explode_list(trim($params["editors"]));
$owner = (!$update) ? $user->getNickname() : (trim($params["owner"]) ?: $user->getNickname());
$result = "FAIL";
if ($groupname != "") {
if (!$update) {
$groupMgr->addGroup($groupname, $owner, $description);
$result = "OK";
} else {
$gid = $params["id"];
$group = $groupMgr->getGroup($gid);
if ($group !== null) {
$group->disableAutoStoring();
$group->setName($groupname);
$group->setDescription($description);
// only an existing user might be an owner of a group
if ($userMgr->getUser($owner) !== null) {
$group->setOwner($owner);
}
$editors = array_intersect($editors, $group->getMembers()); // a user cannot be an editor if not participant of the group
$group->setEditors($editors);
$group->storeMods();
$group->enableAutoStoring();
$result = "OK";
}
}
}
return $result;
}
function delete_groups(ReqHandler &$rh, array $params): string
{
global $groupMgr;
$groups = explode_list($params["ids"] ?? "");
foreach ($groups as $g) {
$groupMgr->deleteGroup($g);
}
return "OK";
}
function get_all_groups(ReqHandler &$rh, array $params): array
{
global $groupMgr;
$groups = $groupMgr->getAllGroups();
$a = [];
foreach ($groups as $g) {
$a[] = $g->toArray();
}
return $a;
}
function search_groups(ReqHandler &$rh, array $params): array
{
global $groupMgr;
$groups = $groupMgr->searchGroups($params["needle"]);
$a = [];
foreach ($groups as $g) {
$a[] = $g->toArray();
}
return $a;
}
function create_update_user(ReqHandler &$rh, array $params): string
{
global $userMgr;
$update = $params[ReqHandler::ACTION_KEY] === "update_user";
$target_nickname = trim($params["nickname"]);
$password = trim($params["password"]);
$realname = trim($params["realname"]);
$privilege = trim($params["privilege"]);
$success = false;
if (($target_nickname !== "")) {
if ((!$update) && ($password !== "")) { // CREATE
$success = $userMgr->addUser($target_nickname, $password, $realname, $privilege);
} else if ($update) { // UPDATE
$tuser = $userMgr->getUser($target_nickname); // load user data
if ($tuser !== null) {
// further field update
$tuser->disableAutoStoring();
$tuser->setRealname($realname);
$tuser->setPrivilege($privilege);
// password replacement, if requested
if ($password !== "") {
$tuser->changePassword(password_hash($password, PASSWORD_DEFAULT), "", false);
}
$tuser->storeMods();
$tuser->enableAutoStoring();
$success = true;
}
}
}
return $success ? "OK" : "FAIL";
}
function delete_users(ReqHandler &$rh, array $params): string
{
global $userMgr;
$nicknames = explode_list($params["users"]);
foreach ($nicknames as $nick) {
$userMgr->deleteUser($nick);
}
return "OK";
}
function get_all_users(ReqHandler &$rh, array $params): array
{
global $userMgr;
$user_data_filtered = [];
$all_users = $userMgr->getAllUsers();
for ($i = 0; $i < count($all_users); $i++) {
$a = $all_users[$i]->toArray(); // convert user to array
unset($a["password"]); // remove password from records
$user_data_filtered[] = $a;
}
return $user_data_filtered;
}
function get_user_groups(ReqHandler &$rh, array $params): array
{
global $groupMgr;
$groups = $groupMgr->getUserGroupIDs($params["nickname"]);
$groupMgr->resolveGroupIds($groups);
return $groups;
}
function get_game_groups(ReqHandler &$rh, array $params): array
{
global $groupMgr;
$groups = $groupMgr->getGameGroupIDs($params["gameid"]);
$groupMgr->resolveGroupIds($groups);
return $groups;
}
function change_group_members(ReqHandler &$rh, array $params): string
{
global $groupMgr;
global $user;
global $userMgr;
$group = $groupMgr->getGroup($params["groupid"]);
if ($group !== null) {
if ($group->isUserContributor($user->getNickname())) {
$add = explode_list(trim($params["add"]));
$add = $userMgr->sanitizeNicknames($add);
$remove = explode_list(trim($params["remove"]));
$remove = $userMgr->sanitizeNicknames($remove);
$group->changeMembers($add, $remove);
return "OK";
}
}
return "FAIL";
}
function import_users_from_csv(ReqHandler &$rh, array $params): string
{
if (!isset($_FILES["users_table"])) {
}
return "OK";
}
$rh->add("create_group", ["groupname", "description"], PRIVILEGE_QUIZMASTER, "create_update_group", RESP_PLAIN, "Create group.");
$rh->add("update_group", ["groupname", "description", "owner", "editors", "id"], PRIVILEGE_QUIZMASTER, "create_update_group", RESP_PLAIN, "Update group.");
$rh->add("delete_groups", ["ids"], PRIVILEGE_QUIZMASTER, "delete_groups", RESP_PLAIN, "Delete group.");
$rh->add("get_all_groups", [], PRIVILEGE_QUIZMASTER, "get_all_groups", RESP_JSON, "Get all player groups.");
$rh->add("search_groups", ["needle"], PRIVILEGE_QUIZMASTER, "search_groups", RESP_JSON, "Serach and fetch player groups.");
$rh->add("change_group_members", ["groupid", "add", "remove"], PRIVILEGE_QUIZMASTER, "change_group_members", RESP_PLAIN, "Change group members.");
$rh->add(["create_user", "update_user"], ["nickname", "password", "realname", "privilege"], PRIVILEGE_QUIZMASTER, "create_update_user", RESP_PLAIN, "Create or update user.");
$rh->add("delete_users", ["users"], PRIVILEGE_QUIZMASTER, "delete_users", RESP_PLAIN, "Delete users.");
$rh->add("get_all_users", [], PRIVILEGE_QUIZMASTER, "get_all_users", RESP_JSON, "Get all users.");
$rh->add("get_user_groups", ["nickname"], PRIVILEGE_QUIZMASTER, "get_user_groups", RESP_JSON, "Get user's groups.");
$rh->add("get_game_groups", ["gameid"], PRIVILEGE_QUIZMASTER, "get_game_groups", RESP_JSON, "Get game's groups.");
$rh->add("import_users_from_csv", [], PRIVILEGE_QUIZMASTER, "import_users_from_csv", RESP_JSON, "Get all users.");
//function test(ReqHandler &$rh, array $params): string
//{
// $usrmgr = new UserMgr();
// $nicknames = $usrmgr->getAllNicknames();
// return join(", ", $nicknames);
//}
//$rh->add("test", [], PRIVILEGE_QUIZMASTER, "test", RESP_PLAIN, "Test.");
// ----------
process_and_print:
[$result, $success] = $rh->process($privilege);
if ($success && ($result !== "")) {
echo $result;
}