client-intel.php

<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=UTF-8');
header('Cache-Control: no-store, private, max-age=0');
header('Pragma: no-cache');
header('X-Robots-Tag: noindex, nofollow');
header('X-Content-Type-Options: nosniff');

function oll4_server_header(string $name): string {
    $key = 'HTTP_' . strtoupper(str_replace('-', '_', $name));
    return trim((string)($_SERVER[$key] ?? ''));
}

function oll4_country_name(string $code): string {
    static $countries = [
        'GR' => 'Greece',
        'TH' => 'Thailand',
        'GB' => 'United Kingdom',
        'US' => 'United States',
        'CY' => 'Cyprus',
        'DE' => 'Germany',
        'FR' => 'France',
        'IT' => 'Italy',
        'NL' => 'Netherlands',
        'BG' => 'Bulgaria',
        'RO' => 'Romania',
        'AL' => 'Albania',
        'TR' => 'Turkey',
        'AE' => 'United Arab Emirates',
        'IN' => 'India',
        'SG' => 'Singapore',
        'JP' => 'Japan',
        'AU' => 'Australia',
        'CA' => 'Canada',
    ];
    $code = strtoupper($code);
    return $countries[$code] ?? ($code !== '' ? $code : 'unknown');
}

$ip = oll4_server_header('CF-Connecting-IP');
if ($ip === '') {
    $parts = array_map('trim', explode(',', oll4_server_header('X-Forwarded-For')));
    $ip = $parts[0] ?? '';
}
if ($ip === '') {
    $ip = (string)($_SERVER['REMOTE_ADDR'] ?? '');
}

$country = strtoupper(oll4_server_header('CF-IPCountry'));
$region = oll4_server_header('CF-Region');
if ($region === '') $region = oll4_server_header('CF-Region-Code');
if ($region === '') $region = oll4_server_header('CF-IPCity');

$ipVersion = 'unknown';
if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) $ipVersion = 'IPv6';
if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) $ipVersion = 'IPv4';

echo json_encode([
    'country' => $country !== '' && $country !== 'XX' ? $country : '',
    'country_name' => $country !== '' && $country !== 'XX' ? oll4_country_name($country) : '',
    'region' => $region,
    'ip_version' => $ipVersion,
    'tls' => (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off'),
], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);