php判断授权转JS判断授权

如题这是一段php的域名是否授权代码，有没有办法改成js的

error_reporting(0);
function getTopDomainhuo(){
        $host=$_SERVER['HTTP_HOST'];
        
        $matchstr="[^\.]+\.(?:(".$str.")|\w{2}|((".$str.")\.\w{2}))$";
        if(preg_match("/".$matchstr."/ies",$host,$matchs)){
            $domain=$matchs['0'];
        }else{
            $domain=$host;
        }
        return $domain;
}
$domain=getTopDomainhuo();
$check_host = 'https://token.su1018.cn/update.php';
$client_check = $check_host . '?a=client_check&u=' . $_SERVER['HTTP_HOST'];
$check_message = $check_host . '?a=check_message&u=' . $_SERVER['HTTP_HOST'];
$check_info=file_get_contents($client_check);
$message = file_get_contents($check_message);
if($check_info=='1'){
   echo '<font color=red>' . $message . '</font>';
   die;
}elseif($check_info=='2'){
   echo '<font color=red>' . $message . '</font>';
   die;
}elseif($check_info=='3'){
   echo '<font color=red>' . $message . '</font>';
   die;
}
unset($domain);

用接口的方式送给前端