public static void Handshake(Stream stream, Uri uri)
{
string key = GetNonce();
string handshake =
$"GET /chat HTTP/1.1\r\n" +
$"Host: {uri.Host}:{uri.Port}\r\n" +
$"Upgrade: websocket\r\n" +
$"Connection: Upgrade\r\n" +
$"Sec-WebSocket-Key: {key}\r\n" +
$"Sec-WebSocket-Version: 13\r\n" +
"\r\n";
byte[] encoded = Encoding.ASCII.GetBytes(handshake);
stream.Write(encoded, 0, encoded.Length);
string responseHeader = stream.ReadHttpHeader();
string acceptHeader = "Sec-WebSocket-Accept: ";
int startIndex = responseHeader.IndexOf(acceptHeader) + acceptHeader.Length;
int endIndex = responseHeader.IndexOf("\r\n", startIndex);
string responseKey = responseHeader.Substring(startIndex, endIndex - startIndex);
string expectedResponse = Nonce.Hash(key);
if (responseKey != expectedResponse)
{
throw new WebSocketException(WebSocketError.HeaderError, $"Response key incorrect, Response:{responseKey} Expected:{expectedResponse}");
}
}
static void AcceptHandshake(Stream stream, string msg)
{
var responseBuffer = new MemoryStream();
string key = GetKey(msg);
string keyHash = Nonce.Hash(key);
CreateResponse(keyHash, responseBuffer);
responseBuffer.WriteTo(stream);
}