servnest/pg-act/ns/sync.php

<?php declare(strict_types=1);

$el_nb = count($_POST['syncs']);
if ($el_nb < 1 OR $el_nb > 8)
	output(403, 'Wrong elements number.');

foreach ($_POST['syncs'] as $i => $sync) {
	if (($sync['source'] ?? '') === '') {
		unset($_POST['syncs'][$i]);
		continue;
	}
	$sync['source'] = formatAbsoluteDomain($sync['source']);
	nsCheckZonePossession($sync['destination']);
}
$syncs = array_values($_POST['syncs']);

$destinations = array_column($syncs, 'destination');
if (count($destinations) !== count(array_unique($destinations)))
	output(403, _('Multiple source domains can\'t be applied to the same target domain.'));

rateLimit();

try {
	DB->beginTransaction();

	query('delete', 'ns-syncs', ['username' => $_SESSION['id']]);

	foreach ($syncs as $sync)
		insert('ns-syncs', [
			'username' => $_SESSION['id'],
			'source' => $sync['source'],
			'destination' => $sync['destination'],
		]);

	DB->commit();
} catch (Exception $e) {
	DB->rollback();
	output(500, 'Database error.', [$e->getMessage()]);
}

output(200, _('Synchronized records updated.'));