<?php
$file = (string)($_GET['file'] ?? '');
$base = realpath(__DIR__ . '/../assets');
$map = [
    'pihole.css' => $base . '/pihole.css',
    'pihole.js' => $base . '/pihole.js',
    'pihole_instances.js' => $base . '/pihole_instances.js',
];

if (!isset($map[$file])) {
    http_response_code(404);
    exit('Not found');
}

$path = $map[$file];
if (!$base || !is_file($path) || !str_starts_with($path, $base)) {
    http_response_code(404);
    exit('Not found');
}

$ext = pathinfo($path, PATHINFO_EXTENSION);
if ($ext === 'css') {
    header('Content-Type: text/css; charset=utf-8');
} elseif ($ext === 'js') {
    header('Content-Type: application/javascript; charset=utf-8');
} else {
    header('Content-Type: application/octet-stream');
}

readfile($path);
exit;