<?php

function nsCommonRequirements() {
	return (isset($_POST['action'])
		AND isset($_POST['zone'])
		AND isset($_POST['ttl-value'])
		AND isset($_POST['ttl-multiplier'])
		AND isset($_SESSION['username'])
	);
}

function nsParseCommonRequirements() {
	nsCheckZonePossession($_POST['zone']);

	if (($_POST['subdomain'] === "") OR ($_POST['subdomain'] === "@"))
		$values['domain'] = $_POST['zone'];
	else
		$values['domain'] = formatAbsoluteDomain(formatEndWithDot($_POST['subdomain']) . $_POST['zone']);

	$values['ttl'] = $_POST['ttl-value'] * $_POST['ttl-multiplier'];

	if (!($values['ttl'] >= 300 AND $values['ttl'] <= 432000))
		userError("Le TTL doit être compris entre 5 minutes et 5 jours (entre 300 et 432000 secondes).");

	return $values;
}

function nsListUserZones($username) {
	return query('select', 'zones', ['username' => $username], 'zone');
}

function nsCheckZonePossession($zone) {
	checkAbsoluteDomainFormat($zone);

	if (!in_array($zone, query('select', 'zones', ['username' => $_SESSION['username']], 'zone'), true))
		userError("You don't own this zone on the nameserver.");
}

function nsDeleteZone($zone) {
	// Remove from Knot configuration
	knotcConfExec(["unset 'zone[$zone]'"]);

	// Remove Knot zone file
	if(unlink(CONF['ns']['knot_zones_path'] . '/' . $zone . 'zone') !== true)
		serverError("Failed to remove Knot zone file.");

	// Remove Knot related data
	exec(CONF['dns']['knotc_path'] . " zone-purge " . $zone);

	// Remove from database
	query('delete', 'zones', [
		'zone' => $zone,
		'username' => $_SESSION['username'],
	]);
}