private static byte[] Handshake(WebSocketHttpRequest request, string subProtocol)
{
NTWebSocketLog.Debug("Building Draft76 Response");
var builder = new StringBuilder();
builder.Append("HTTP/1.1 101 WebSocket Protocol Handshake\r\n");
builder.Append("Upgrade: WebSocket\r\n");
builder.Append("Connection: Upgrade\r\n");
builder.AppendFormat("Sec-WebSocket-Origin: {0}\r\n", request["Origin"]);
builder.AppendFormat("Sec-WebSocket-Location: {0}://{1}{2}\r\n", request.Scheme, request["Host"], request.Path);
if (subProtocol != null)
{
builder.AppendFormat("Sec-WebSocket-Protocol: {0}\r\n", subProtocol);
}
builder.Append("\r\n");
var key1 = request["Sec-WebSocket-Key1"];
var key2 = request["Sec-WebSocket-Key2"];
var challenge = new ArraySegment <byte>(request.Bytes, request.Bytes.Length - 8, 8);
var answerBytes = CalculateAnswerBytes(key1, key2, challenge);
byte[] byteResponse = Encoding.ASCII.GetBytes(builder.ToString());
int byteResponseLength = byteResponse.Length;
Array.Resize(ref byteResponse, byteResponseLength + answerBytes.Length);
Array.Copy(answerBytes, 0, byteResponse, byteResponseLength, answerBytes.Length);
return(byteResponse);
}
private static void ProcessFrame(FrameType frameType, byte[] data, Action <string> onMessage, Action onClose, Action <byte[]> onBinary, Action <byte[]> onPing, Action <byte[]> onPong)
{
switch (frameType)
{
case FrameType.Close:
if (data.Length == 1 || data.Length > 125)
{
throw new WebSocketException(WebSocketStatusCodes.ProtocolError);
}
if (data.Length >= 2)
{
var closeCode = (ushort)data.Take(2).ToArray().ToLittleEndianInt();
if (!WebSocketStatusCodes.ValidCloseCodes.Contains(closeCode) && (closeCode < 3000 || closeCode > 4999))
{
throw new WebSocketException(WebSocketStatusCodes.ProtocolError);
}
}
if (data.Length > 2)
{
ReadUTF8PayloadData(data.Skip(2).ToArray());
}
onClose();
break;
case FrameType.Binary:
onBinary(data);
break;
case FrameType.Ping:
onPing(data);
break;
case FrameType.Pong:
onPong(data);
break;
case FrameType.Text:
onMessage(ReadUTF8PayloadData(data));
break;
default:
NTWebSocketLog.Debug("Received unhandled " + frameType);
break;
}
}
private static byte[] BuildHandshake(WebSocketHttpRequest request, string subProtocol)
{
NTWebSocketLog.Debug("Building Hybi-14 Response");
var builder = new StringBuilder();
builder.Append("HTTP/1.1 101 Switching Protocols\r\n");
builder.Append("Upgrade: websocket\r\n");
builder.Append("Connection: Upgrade\r\n");
if (subProtocol != null)
{
builder.AppendFormat("Sec-WebSocket-Protocol: {0}\r\n", subProtocol);
}
var responseKey = CreateResponseKey(request["Sec-WebSocket-Key"]);
builder.AppendFormat("Sec-WebSocket-Accept: {0}\r\n", responseKey);
builder.Append("\r\n");
return(Encoding.ASCII.GetBytes(builder.ToString()));
}
private static byte[] Handshake(WebSocketHttpRequest request, string subProtocol)
{
NTWebSocketLog.Debug("Building Flash Socket Policy Response");
return(Encoding.UTF8.GetBytes(PolicyResponse));
}