u.php

<?php
$code = $_GET['c'] ?? '';
if (!$code) {
    http_response_code(400);
    exit('No code provided.');
}

$db = json_decode(file_get_contents('db.json'), true);

if (!isset($db[$code]['url'])) {
    http_response_code(404);
    exit('Short URL not found.');
}

$url = $db[$code]['url'];

// Simple IP-based geolocation
function getGeoInfo($ip) {
    $json = @file_get_contents("http://ip-api.com/json/$ip");
    return $json ? json_decode($json, true) : null;
}

$ip = $_SERVER['REMOTE_ADDR'];
$geo = getGeoInfo($ip);

// Log info
$log = [
    'code'      => $code,
    'timestamp' => gmdate('c'),
    'ip'        => $ip,
    'userAgent' => $_SERVER['HTTP_USER_AGENT'] ?? '',
    'referer'   => $_SERVER['HTTP_REFERER'] ?? '',
    'language'  => $_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? '',
    'city'      => $geo['city'] ?? '',
    'region'    => $geo['regionName'] ?? '',
    'country'   => $geo['country'] ?? '',
    'lat'       => $geo['lat'] ?? '',
    'lon'       => $geo['lon'] ?? ''
];

file_put_contents('logs.jsonl', json_encode($log) . PHP_EOL, FILE_APPEND);

// Redirect instantly
header("Location: $url", true, 302);
exit;