servnest/fn/reg.php

<?php

const SUBDOMAIN_REGEX = '^[a-z0-9]{4,63}$';

function regListUserDomains() {
	if (isset($_SESSION['id']))
		return query('select', 'registry', ['username' => $_SESSION['id']], 'domain');
	return [];
}

function regCheckDomainPossession($domain) {
	if (in_array($domain, regListUserDomains(), true) !== true)
		output(403, 'You don\'t own this domain.');
}

function regDeleteDomain($domain) {
	// Delete domain from registry file
	$regFile = file_get_contents(CONF['reg']['registry_file']);
	if ($regFile === false)
		output(500, 'Failed to read current registry File.');
	$regFile = preg_replace('/^(?:[a-z0-9._-]+\.)' . preg_quote($domain, '/') . '[\t ]+.+$/Dm', '', $regFile);
	if (file_put_contents(CONF['reg']['registry_file'], $regFile) === false)
		output(500, 'Failed to write new registry file.');

	// Delete from Niver's database
	query('delete', 'registry', [
		'domain' => $domain,
		'username' => $_SESSION['id'],
	]);
}