Nodejs 中的 c# webclient NetworkCredentials

Question

I have a c# .net Client with this Code:

using(WebClient client = new WebClient())
{
    string serialisedData = "";
    serialisedData = JsonConvert.SerializeObject(myData);
    client.Credentials = new NetworkCredential(config.UserData.Username, config.UserData.Password);
    byte[] responsebyte = client.UploadData(config.ServerAddress, System.Text.Encoding.UTF8.GetBytes(serialisedData));
}

That Client sends data to my nodejs Server. Nodejs Code:

var http = require('http');

var _server = http.createServer(_listener);
_server.listen(1234);

console.log( 'started' );

function _listener(req, res) {
  let data = []
  req.on('data', chunk => {
    data.push(chunk)
  })
  req.on('end', () => {
    data = Buffer.concat(data);
    var dataString = new Buffer.from(data).toString("utf-8");
    const data = JSON.parse(dataString);
    // data has all the data from the c# object "myData"
    res.write('response')
    res.end()
  })
}

But how can I access the credentials of this connection?

---

This is how I can Access the credentials in c#:

HttpListener listener = new HttpListener();
listener.Prefixes.Add($"https://+:{Config.Port}/");
listener.AuthenticationSchemes = AuthenticationSchemes.Basic;
listener.Start();
for (; ; )
{
    Console.WriteLine("Listening...");
    IAsyncResult result = listener.BeginGetContext(new AsyncCallback(DoWork), listener);
    result.AsyncWaitHandle.WaitOne();
    result = null;
}

private void DoWork(IAsyncResult asyncResult)
{
    HttpListener listener = (HttpListener)asyncResult.AsyncState;
    HttpListenerContext context = listener.EndGetContext(asyncResult);
    HttpListenerBasicIdentity identity = (HttpListenerBasicIdentity)context.User.Identity;
    // identity has the credentials

}

---

Edit: I cant change the c# Code anymore. So only nodejs solutions are needed

Edit2: The headers also have no Auth or Authentification property…

Edit3: I cant even find if other location exists except the header for credentials/authentification. But this must be possible right? I mean c# can somehow read this stuff from somewhere…

Any Idea what I can try to find the credentials?

Answer 1

To make your C# client to send its networkCredentials as HTTP Basic Authentication to your Nodejs server; the server should return a response whose header contains a HTTP 401 Unauthorized status and a WWW-Authenticate field if the request does not contain the Authorization header. This will cause your C# client retry the POST with Authorization header.

This process it is called Authentication challenge in case you want to search for more info.

There are serveral packages that does that for you; like http-auth or you can code it by hand (it is not very hard as it is just a matter of checking the existence of the Authorization header in the request and, if there is none or incorrect credentials, make a 401 response with a WWW-Authenticate field)

ie from the top of my head:

var http = require('http');

var _server = http.createServer(listener);
_server.listen(1234);

console.log('started');

function listener(req, res) {

  if (!req.headers.authorization) {
    res.statusCode = 401;
    res.statusMessage = 'Unauthorized';
    res.setHeader('WWW-Authenticate', 'Basic');
    res.end();
  }
}