如何将客户端的正确IP地址转换为Heroku上托管的Node socket.io应用程序？

Question

我最近在Heroku上使用Express和socket.io托管了我的第一个Node应用程序,需要找到客户端的IP地址.到目前为止,我已经尝试了socket.manager.handshaken[socket.id].address,socket.handshake.address并且socket.connection.address,两者都没有给出正确的地址.

应用程序:http://nes-chat.herokuapp.com/(还包含指向GitHub repo的链接)

要查看已连接用户的IP,请访问:http://nes-chat.herokuapp.com/users

谁知道问题是什么？

Answer 1

客户端IP地址在X-Forwarded-ForHTTP标头中传递.我还没有测试过,但看起来socket.io在确定客户端IP时已经考虑到了这一点.

您也应该能够自己抓住它,这是一个指南:

function getClientIp(req) {
  var ipAddress;
  // Amazon EC2 / Heroku workaround to get real client IP
  var forwardedIpsStr = req.header('x-forwarded-for'); 
  if (forwardedIpsStr) {
    // 'x-forwarded-for' header may return multiple IP addresses in
    // the format: "client IP, proxy 1 IP, proxy 2 IP" so take the
    // the first one
    var forwardedIps = forwardedIpsStr.split(',');
    ipAddress = forwardedIps[0];
  }
  if (!ipAddress) {
    // Ensure getting client IP address still works in
    // development environment
    ipAddress = req.connection.remoteAddress;
  }
  return ipAddress;
};

Answer 2

您可以在一行中完成。

function getClientIp(req) {
    // The X-Forwarded-For request header helps you identify the IP address of a client when you use HTTP/HTTPS load balancer.
    // http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/TerminologyandKeyConcepts.html#x-forwarded-for
    // If the value were "client, proxy1, proxy2" you would receive the array ["client", "proxy1", "proxy2"]
    // http://expressjs.com/4x/api.html#req.ips
    var ip = req.headers['x-forwarded-for'] ? req.headers['x-forwarded-for'].split(',')[0] : req.connection.remoteAddress;
    console.log('IP: ', ip);
}

我喜欢将它添加到中间件并将 IP 作为我自己的自定义对象附加到请求中。