internal static async Task <HttpRequest> DoHandShaking(TcpClient clientWssAccepted, NetworkStream clientStream, byte[] wssReceivedBytes)
{
string wss1stData = Encoding.UTF8.GetString(wssReceivedBytes);
HttpRequest firstRequest = null;
if (Regex.IsMatch(wss1stData, "^GET", RegexOptions.IgnoreCase))
{
firstRequest = await HttpTransform.BuildHttpRequest(wss1stData);
WebsocketServerHub.Register(firstRequest.UrlRelative, clientWssAccepted, clientStream);
//do handshaking
string swk = Regex.Match(wss1stData, "Sec-WebSocket-Key: (.*)").Groups[1].Value.Trim();
string swka = swk + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
byte[] swkaSha1 = System.Security.Cryptography.SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(swka));
string swkaSha1Base64 = Convert.ToBase64String(swkaSha1);
byte[] response = Encoding.UTF8.GetBytes(
"HTTP/1.1 101 Switching Protocols\r\n" +
"Connection: Upgrade\r\n" +
"Upgrade: websocket\r\n" +
"Sec-WebSocket-Accept: " + swkaSha1Base64 + "\r\n\r\n");
await clientStream.WriteAsync(response, 0, response.Length);
return(firstRequest);
}
return(firstRequest);
}
internal static async Task ReceiveAndReplyClientMessage(TcpClient clientWssAccepted, NetworkStream clientStream, byte[] wssReceivedBytes, HttpRequest firstRequestOfHandShake)
{
bool fin = (wssReceivedBytes[0] & 0b10000000) != 0;
bool mask = (wssReceivedBytes[1] & 0b10000000) != 0; // must be true, "All messages from the client to the server have this bit set"
int opcode = wssReceivedBytes[0] & 0b00001111, // expecting 1 - text message
msglen = wssReceivedBytes[1] - 128, // & 0111 1111
offset = 2;
if (msglen == 126)
{
// was ToUInt16(bytes, offset) but the result is incorrect
msglen = BitConverter.ToUInt16(new byte[] { wssReceivedBytes[3], wssReceivedBytes[2] }, 0);
offset = 4;
}
else if (msglen == 127)
{
Console.WriteLine("TODO: msglen == 127, needs qword to store msglen");
// i don't really know the byte order, please edit this
// msglen = BitConverter.ToUInt64(new byte[] { bytes[5], bytes[4], bytes[3], bytes[2], bytes[9], bytes[8], bytes[7], bytes[6] }, 0);
// offset = 10;
}
if (msglen == 0)
{
Console.WriteLine("msglen == 0");
}
else if (mask)
{
byte[] decoded = new byte[msglen];
byte[] masks = new byte[4] {
wssReceivedBytes[offset], wssReceivedBytes[offset + 1], wssReceivedBytes[offset + 2], wssReceivedBytes[offset + 3]
};
offset += 4;
for (int i = 0; i < msglen; ++i)
{
decoded[i] = (byte)(wssReceivedBytes[offset + i] ^ masks[i % 4]);
}
string receivedFromClient = Encoding.UTF8.GetString(decoded);
var wssResponse = await RoutingHandler.HandleWss(new HttpRequest()
{
UrlRelative = firstRequestOfHandShake.UrlRelative,
Method = "wss",
CreatedAt = DateTime.Now,
Body = receivedFromClient,
RemoteEndPoint = clientWssAccepted.Client.RemoteEndPoint.ToString()
});
WebsocketServerHub.Send(clientWssAccepted, clientStream, wssResponse);
}
else
{
Console.WriteLine("mask bit not set");
}
}
public static void Publish(string urlRelative, IResponse response)
{
if (_channel.TryGetValue(urlRelative, out BlockingCollection <KeyValuePair <TcpClient, NetworkStream> > clients) &&
clients != null)
{
List <Task> tasks = new List <Task>();
foreach (var client in clients)
{
tasks.Add(Task.Run(() =>
{
if (!client.Key.Client.Connected)
{
WebsocketServerHub.Remove(urlRelative);
return;
}
WebsocketServerHub.Send(client.Key, client.Value, response);
}));
}
//want to make sure sent all to client
//Task.WhenAll(tasks).GetAwaiter().GetResult();
}
}
async Task InternalStartAcceptIncommingAsync(TcpListener tcpListener)
{
//you may want to do with ssl
//https://docs.microsoft.com/en-us/dotnet/api/system.net.security.sslstream?redirectedfrom=MSDN&view=netcore-3.1
while (!_isStop)
{
try
{
if (_isWss)
{
//https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_server
TcpClient clientWssAccepted = await tcpListener.AcceptTcpClientAsync();
NetworkStream clientStream = clientWssAccepted.GetStream();
HttpRequest wss1stRequestOfHandShake = null;
Task twss = Task.Run(async() =>
{
while (!_isStop)
{
if (!clientWssAccepted.Client.Connected)
{
if (wss1stRequestOfHandShake != null)
{
WebsocketServerHub.Remove(wss1stRequestOfHandShake.UrlRelative);
}
await Shutdown(clientWssAccepted.Client, wss1stRequestOfHandShake);
break;
}
while (!clientStream.DataAvailable)
{
;
}
while (clientWssAccepted.Available < 3)
{
; // match against "get"
}
byte[] wssReceivedBytes = new byte[clientWssAccepted.Available];
await clientStream.ReadAsync(wssReceivedBytes, 0, clientWssAccepted.Available);
var handShakeRequest = await WebsocketServerHub.DoHandShaking(clientWssAccepted, clientStream, wssReceivedBytes);
if (handShakeRequest != null)
{
wss1stRequestOfHandShake = handShakeRequest;
}
await WebsocketServerHub.ReceiveAndReplyClientMessage(clientWssAccepted, clientStream, wssReceivedBytes, wss1stRequestOfHandShake);
}
});
continue;
}
//WebHostWorker will try accept its job
Socket clientSocket = await tcpListener.AcceptSocketAsync();
//parse request then dispatched by RoutingHandler
var t = Task.Run(async() =>
{
Task <HttpRequest> tRequest = ReadByteFromClientSocketAndBuildRequest(clientSocket);
HttpRequest request = new HttpRequest();
request.CreatedAt = DateTime.Now;
request.RemoteEndPoint = clientSocket.RemoteEndPoint.ToString();
var tempRequest = await tRequest;
request.Body = tempRequest.Body;
request.Error = tempRequest.Error;
request.Header = tempRequest.Header;
request.HeadlerCollection = tempRequest.HeadlerCollection;
request.HttpVersion = tempRequest.HttpVersion;
request.Method = tempRequest.Method;
request.QueryParamCollection = tempRequest.QueryParamCollection;
request.Url = tempRequest.Url;
request.UrlRelative = tempRequest.UrlRelative;
request.UrlQueryString = tempRequest.UrlQueryString;
//dispatched routing here
var processedResult = await RoutingHandler.Handle(request);
HttpResponse response = await HttpTransform.BuildHttpResponse(processedResult, request);
await SendResponseToClientSocket(clientSocket, request, response);
await Shutdown(clientSocket, request);
HttpLogger.Log(request);
Console.WriteLine($"{request.RemoteEndPoint}@{request.CreatedAt}=>{request.Method}:{request.Url}");
});
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine(JsonConvert.SerializeObject(ex));
}
finally
{
await Task.Delay(0);
}
}
}
