public Task<WebSocketConnection> Hanshake(NetworkStream stream, Uri uri, string protocol, string origin)
{
var result = new Task<WebSocketConnection>(() =>
{
var keyBytes = new byte[16];
var random = new Random();
random.NextBytes(keyBytes);
var key = Convert.ToBase64String(keyBytes);
var requestSb = new StringBuilder();
requestSb.AppendFormat("GET {0} HTTP/1.1\n", uri.PathAndQuery);
requestSb.AppendFormat("Host: {0}\n", uri.Host);
requestSb.AppendLine("Upgrade: websocket");
requestSb.AppendLine("Connection: Upgrade");
requestSb.AppendFormat("Sec-WebSocket-Key: {0}\n", key);
if (!String.IsNullOrEmpty(origin)) requestSb.AppendFormat("Origin: {0}\n", origin);
if (!String.IsNullOrEmpty(protocol)) requestSb.AppendFormat("Sec-WebSocket-Protocol: {0}\n", protocol);
requestSb.AppendLine("Sec-WebSocket-Version: 13");
requestSb.AppendLine();
var request = requestSb.ToString();
var reader = new StreamReader(stream);
var writer = new StreamWriter(stream);
writer.Write(request);
writer.Flush();
var responseLines = new List<string>();
try
{
string str;
while (!String.IsNullOrEmpty(str = reader.ReadLine()))
{
responseLines.Add(str);
}
}
catch (IOException)
{
return null;
}
var message = new HttpResponse(responseLines);
if (message.ResponseCode != "101") return null;
var response = message.Headers["Sec-WebSocket-Accept"];
var expectedResponse = WebSocketHandshaker.GetSecWebSocketKeyResponse(key);
if (response != expectedResponse) return null;
var connection = new WebSocketConnection(stream);
connection.StartRead();
return connection;
});
result.Start();
return result;
}
public WebSocketConnectionEventArgs(WebSocketConnection connection, NetworkStream stream,
string uri,
string origin,
IEnumerable<string> protocols,
IDictionary<string, string> headers)
{
Connection = connection;
Stream = stream;
Uri = uri;
Origin = origin;
Protocols = protocols;
Headers = headers;
}
private WebSocketConnection CreateNewConnection(NetworkStream stream)
{
var connection = new WebSocketConnection(stream);
lock (_connections)
{
_connections.Add(connection);
}
connection.Closed += ConnectionClosedHandler;
connection.StartRead();
return connection;
}
public WebSocketConnectionEventArgs(WebSocketConnection connection, NetworkStream stream)
: this(connection, stream, null, null, null, null)
{
}
