'disable',
'ips' => ['', '', '', '', '']
];
// load existing data
if (file_exists($jsonFile)) {
$raw = file_get_contents($jsonFile);
$data = json_decode($raw, true);
if (!is_array($data)) $data = $defaults;
} else {
$data = $defaults;
}
$errors = [];
$saveSuccess = '';
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
// read posted values
$posted_firewall = isset($_POST['firewall']) && in_array($_POST['firewall'], ['enable', 'disable']) ? $_POST['firewall'] : 'disable';
$posted_ips = [];
for ($i = 1; $i <= 5; $i++) {
$key = "ip{$i}";
$val = isset($_POST[$key]) ? trim((string)$_POST[$key]) : '';
$posted_ips[] = $val;
}
// validate IPs (allow empty)
foreach ($posted_ips as $index => $ip) {
if ($ip !== '' && !filter_var($ip, FILTER_VALIDATE_IP)) {
$errors[] = "IP" . ($index + 1) . " is not a valid IP address: " . htmlspecialchars($ip);
}
}
if (empty($errors)) {
$new = [
'firewall' => $posted_firewall,
'ips' => $posted_ips
];
$json = json_encode($new, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
if (file_put_contents($jsonFile, $json, LOCK_EX) === false) {
$errors[] = "Failed to write {$jsonFile}. Check permissions.";
} else {
$data = $new;
$saveSuccess = "Saved.";
}
}
}
?>
';
foreach ($errors as $e) echo '' . $e . '
';
echo '';
}
if ($saveSuccess) {
echo '' . htmlspecialchars($saveSuccess) . '
';
}
?>