184 lines
5.9 KiB
C#
184 lines
5.9 KiB
C#
using System;
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using System.IO;
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using System.Threading;
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using ln.logging;
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using ln.http.exceptions;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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namespace ln.http.websocket
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{
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public enum WebSocketOpcode : int
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{
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CONTINUATION = 0x00,
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TEXT = 0x01,
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BINARY = 0x02,
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CLOSE = 0x08,
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PING = 0x09,
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PONG = 0x0A,
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INVALIDOPCODE = -1
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}
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public enum WebSocketState
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{
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HANDSHAKE,
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OPEN,
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CLOSING,
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CLOSED,
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ERROR
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}
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public delegate void WebSocketEventDelegate(WebSocket sender,WebSocketEventArgs e);
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public class WebSocket
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{
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public HttpRequest HttpRequest { get; }
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public Stream Stream { get; }
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public WebSocketState State { get; private set; } = WebSocketState.HANDSHAKE;
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public event WebSocketEventDelegate WebSocketEvent;
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Thread receiverThread;
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public WebSocket(HttpRequest httpRequest)
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{
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HttpRequest = httpRequest;
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Stream = httpRequest.GetConnectionStream();
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if ((!httpRequest.GetRequestHeader("upgrade", "").Contains("websocket")) && (!httpRequest.GetRequestHeader("connection", "").Contains("Upgrade")))
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throw new HttpException(400, "This resource is a websocket endpoint only");
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if (!httpRequest.GetRequestHeader("Sec-WebSocket-Version", "").Equals("13"))
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throw new HttpException(400, "Unsupported Protocol Version (WebSocket)");
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String wsKey = httpRequest.GetRequestHeader("Sec-WebSocket-Key");
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HttpResponse httpResponse = new HttpResponse(httpRequest);
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httpResponse.StatusCode = 101;
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httpResponse.StatusMessage = "Switching Protocols";
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httpResponse.AddHeader("upgrade", "websocket");
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httpResponse.AddHeader("connection", "Upgrade");
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httpResponse.AddHeader("Sec-WebSocket-Version", "13");
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string acceptKey = String.Format("{0}258EAFA5-E914-47DA-95CA-C5AB0DC85B11", httpRequest.GetRequestHeader("Sec-WebSocket-Key"));
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httpResponse.AddHeader(
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"Sec-Websocket-Accept",
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Convert.ToBase64String(SHA1.Create().ComputeHash(Encoding.ASCII.GetBytes(acceptKey)))
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);
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HTTPServer.SendResponse(Stream, httpResponse);
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State = WebSocketState.OPEN;
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}
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public bool IsAlive => ((receiverThread != null) && receiverThread.IsAlive);
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public void Start()
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{
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if ((receiverThread == null) || !receiverThread.IsAlive)
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{
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receiverThread = new Thread(() => Run());
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receiverThread.Start();
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}
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}
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public void Close()
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{
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switch (State)
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{
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case WebSocketState.HANDSHAKE:
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case WebSocketState.ERROR:
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case WebSocketState.CLOSING:
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State = WebSocketState.CLOSED;
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Stream.Close();
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break;
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case WebSocketState.CLOSED:
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break;
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case WebSocketState.OPEN:
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WebSocketFrame closeFrame = new WebSocketFrame(WebSocketOpcode.CLOSE);
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lock (Stream)
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{
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Send(closeFrame);
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State = WebSocketState.CLOSING;
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}
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break;
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}
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}
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public void Run()
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{
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try
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{
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//Send("Hello World!");
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while (State != WebSocketState.CLOSED)
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{
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WebSocketFrame webSocketFrame = new WebSocketFrame(Stream);
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switch (webSocketFrame.Opcode)
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{
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case WebSocketOpcode.TEXT:
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case WebSocketOpcode.BINARY:
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WebSocketEvent(this, new WebSocketEventArgs(webSocketFrame));
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break;
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case WebSocketOpcode.CLOSE:
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if (State == WebSocketState.OPEN)
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{
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WebSocketFrame closeFrame = new WebSocketFrame(WebSocketOpcode.CLOSE);
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closeFrame.FIN = true;
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lock (Stream)
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{
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Send(closeFrame);
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State = WebSocketState.CLOSING;
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}
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}
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State = WebSocketState.CLOSED;
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Stream.Close();
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break;
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case WebSocketOpcode.PING:
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WebSocketFrame pong = new WebSocketFrame(WebSocketOpcode.PONG);
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pong.ApplicationData = webSocketFrame.ApplicationData;
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Send(pong);
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break;
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}
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}
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} catch (Exception e)
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{
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Logging.Log(LogLevel.ERROR, "WebSocket caught Exception: {0}", e.ToString());
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Logging.Log(e);
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}
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receiverThread = null;
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}
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public void Send(WebSocketFrame frame)
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{
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lock (Stream)
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{
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if (State == WebSocketState.OPEN)
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frame.WriteTo(Stream);
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else
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throw new IOException("WebSocket is not open");
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}
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}
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public void Send(string textMessage)
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{
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WebSocketFrame webSocketFrame = new WebSocketFrame(textMessage);
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Send(webSocketFrame);
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}
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public void Send(byte[] binaryMessage)
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{
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WebSocketFrame webSocketFrame = new WebSocketFrame(binaryMessage);
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Send(webSocketFrame);
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}
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}
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}
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