/// <summary>
/// Upgrades the connection to the particular protocol. Handles the handshake.
/// </summary>
/// <param name="context"><see cref="ProcessingContext"/> for the current connection.</param>
/// <param name="httpContext"><see cref="HttpContext"/> for the current connection.</param>
/// <returns>The handlers that have been inserted in the pipeline.</returns>
public WebSocketPipeline Upgrade(ProcessingContext context, HttpContext httpContext)
{
var request = httpContext.Request;
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.Headers["Origin"]);
//builder.AppendFormat("Sec-WebSocket-Location: {0}://{1}{2}\r\n", secure ? "wss" : "ws", request.Headers["Host"], request.Path);
builder.AppendFormat("Sec-WebSocket-Location: {0}://{1}{2}\r\n", "ws", request.Headers["Host"], request.Path);
if (request.Headers["Sec-WebSocket-Protocol"] != null)
{
builder.AppendFormat("Sec-WebSocket-Protocol: {0}\r\n", request.Headers["Sec-WebSocket-Protocol"]);
}
builder.Append("\r\n");
var key1 = request.Headers["Sec-WebSocket-Key1"];
var key2 = request.Headers["Sec-WebSocket-Key2"];
// Get last bytes
byte[] challenge = request.Body;
// Compile the body
var part1 = Encoding.ASCII.GetBytes(builder.ToString());
var part2 = CalculateAnswerBytes(key1, key2, challenge);
var buffer = new byte[part1.Length + part2.Length];
Memory.Copy(part1, 0, buffer, 0, part1.Length);
Memory.Copy(part2, 0, buffer, part1.Length, part2.Length);
// Prepare the response packet
var response = BytePacket.Acquire(buffer);
// Get the channel
var channel = httpContext.Connection;
// Send the handshake response
channel.Send(response);
// Set the encoder & the decoder for this websocket handler
channel.Encoding.PipelineAddLast(Encode.WebSocketDraft76);
channel.Decoding.PipelineAddFirst(Decode.WebSocketDraft76);
// Trace a websocket event
NetTrace.WriteLine("Upgraded to Draft76 ", channel, NetTraceCategory.WebSocket);
return(new WebSocketPipeline(Encode.WebSocketDraft76, Decode.WebSocketDraft76));
}
