servnest/pg-act/ns/caa.php

<?php declare(strict_types=1);

$values = nsParseCommonRequirements();

if (!($_POST['flag'] >= 0 AND $_POST['flag'] <= 255))
	output(403, 'Wrong value for <code>flag</code>.');

if (!(preg_match('/^[a-z0-9]{1,127}$/D', $_POST['tag'])))
	output(403, 'Wrong value for <code>tag</code>.');

if (!(preg_match('/^[a-zA-Z0-9 .,;*|#~@=:!?%$+\/\()[\]_-]{1,255}$/D', $_POST['value'])))
	output(403, 'Wrong value for <code>value</code>.');

rateLimit();

knotcZoneExec($_POST['zone'], [
	$values['domain'],
	$values['ttl'],
	'CAA',
	$_POST['flag'],
	$_POST['tag'],
	$_POST['value']
]);

output(200, _('Modification done.'));