S2OJ/web/app/controllers/click_zan.php

<?php

function validateZan() {
	if (!validateUInt($_POST['id']))
		return false;
	if (!validateInt($_POST['delta']))
		return false;
	if ($_POST['delta'] != 1 && $_POST['delta'] != -1)
		return false;
	if (!ClickZans::getTable($_POST['type']))
		return false;
	return true;
}
if (!validateZan()) {
	die('<div class="text-danger">failed</div>');
}
if (!Auth::check()) {
	die('<div class="text-danger">please <a href="' . HTML::url('/login') . '">log in</a></div>');
}
if (!ClickZans::canClickZan($_POST['id'], $_POST['type'], Auth::user())) {
	die('<div class="text-danger">no permission</div>');
}

die(ClickZans::click($_POST['id'], $_POST['type'], Auth::user(), $_POST['delta']));