protected internal override IFullHttpRequest NewHandshakeRequest()
{
Uri wsUrl = Uri;
// Get 16 bit nonce and base 64 encode it
byte[] nonce = WebSocketUtil.RandomBytes(16);
string key = WebSocketUtil.Base64String(nonce);
string acceptSeed = key + MagicGuid;
byte[] sha1 = WebSocketUtil.Sha1(Encoding.ASCII.GetBytes(acceptSeed));
_expectedChallengeResponseString = new AsciiString(WebSocketUtil.Base64String(sha1));
#if DEBUG
if (Logger.DebugEnabled)
{
Logger.WebSocketVersion07ClientHandshakeKey(key, _expectedChallengeResponseString);
}
#endif
// Format request
var request = new DefaultFullHttpRequest(HttpVersion.Http11, HttpMethod.Get, UpgradeUrl(wsUrl),
Unpooled.Empty);
HttpHeaders headers = request.Headers;
if (CustomHeaders is object)
{
_ = headers.Add(CustomHeaders);
if (!headers.Contains(HttpHeaderNames.Host))
{
// Only add HOST header if customHeaders did not contain it.
//
// See https://github.com/netty/netty/issues/10101
_ = headers.Set(HttpHeaderNames.Host, WebsocketHostValue(wsUrl));
}
}
else
{
_ = headers.Set(HttpHeaderNames.Host, WebsocketHostValue(wsUrl));
}
_ = headers.Set(HttpHeaderNames.Upgrade, HttpHeaderValues.Websocket)
.Set(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade)
.Set(HttpHeaderNames.SecWebsocketKey, key);
if (!headers.Contains(HttpHeaderNames.SecWebsocketOrigin))
{
_ = headers.Set(HttpHeaderNames.SecWebsocketOrigin, WebsocketOriginValue(wsUrl));
}
string expectedSubprotocol = ExpectedSubprotocol;
if (!string.IsNullOrEmpty(expectedSubprotocol))
{
_ = headers.Set(HttpHeaderNames.SecWebsocketProtocol, expectedSubprotocol);
}
_ = headers.Set(HttpHeaderNames.SecWebsocketVersion, Version.ToString());
return(request);
}
/// <summary>
/// Handle the web socket handshake for the web socket specification <a href=
/// "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-07">HyBi version 7</a>.
///
/// <para>
/// Browser request to the server:
/// </para>
///
/// <![CDATA[
/// GET /chat HTTP/1.1
/// Host: server.example.com
/// Upgrade: websocket
/// Connection: Upgrade
/// Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
/// Sec-WebSocket-Origin: http://example.com
/// Sec-WebSocket-Protocol: chat, superchat
/// Sec-WebSocket-Version: 7
/// ]]>
///
/// <para>
/// Server response:
/// </para>
///
/// <![CDATA[
/// HTTP/1.1 101 Switching Protocols
/// Upgrade: websocket
/// Connection: Upgrade
/// Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
/// Sec-WebSocket-Protocol: chat
/// ]]>
/// </summary>
protected internal override IFullHttpResponse NewHandshakeResponse(IFullHttpRequest req, HttpHeaders headers)
{
if (!req.Headers.TryGet(HttpHeaderNames.SecWebsocketKey, out ICharSequence key) ||
key is null)
{
ThrowHelper.ThrowWebSocketHandshakeException_MissingKey();
}
var res = new DefaultFullHttpResponse(HttpVersion.Http11, HttpResponseStatus.SwitchingProtocols,
req.Content.Allocator.Buffer(0));
if (headers is object)
{
_ = res.Headers.Add(headers);
}
string acceptSeed = key + Websocket07AcceptGuid;
byte[] sha1 = WebSocketUtil.Sha1(Encoding.ASCII.GetBytes(acceptSeed));
string accept = WebSocketUtil.Base64String(sha1);
#if DEBUG
if (Logger.DebugEnabled)
{
Logger.WebSocketVersion07ServerHandshakeKey(key, accept);
}
#endif
_ = res.Headers.Set(HttpHeaderNames.Upgrade, HttpHeaderValues.Websocket)
.Set(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade)
.Set(HttpHeaderNames.SecWebsocketAccept, accept);
if (req.Headers.TryGet(HttpHeaderNames.SecWebsocketProtocol, out ICharSequence subprotocols) &&
subprotocols is object)
{
string selectedSubprotocol = this.SelectSubprotocol(subprotocols.ToString());
if (selectedSubprotocol is null)
{
#if DEBUG
if (Logger.DebugEnabled)
{
Logger.RequestedSubprotocolNotSupported(subprotocols);
}
#endif
}
else
{
_ = res.Headers.Add(HttpHeaderNames.SecWebsocketProtocol, selectedSubprotocol);
}
}
return(res);
}
protected override IFullHttpResponse NewHandshakeResponse(IFullHttpRequest req, HttpHeaders headers)
{
var res = new DefaultFullHttpResponse(HttpVersion.Http11, HttpResponseStatus.SwitchingProtocols);
if (headers != null)
{
res.Headers.Add(headers);
}
if (!req.Headers.TryGet(HttpHeaderNames.SecWebsocketKey, out ICharSequence key) ||
key == null)
{
throw new WebSocketHandshakeException("not a WebSocket request: missing key");
}
string acceptSeed = key + Websocket07AcceptGuid;
byte[] sha1 = WebSocketUtil.Sha1(Encoding.ASCII.GetBytes(acceptSeed));
string accept = WebSocketUtil.Base64String(sha1);
if (Logger.DebugEnabled)
{
Logger.Debug("WebSocket version 07 server handshake key: {}, response: {}.", key, accept);
}
res.Headers.Add(HttpHeaderNames.Upgrade, HttpHeaderValues.Websocket);
res.Headers.Add(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade);
res.Headers.Add(HttpHeaderNames.SecWebsocketAccept, accept);
if (req.Headers.TryGet(HttpHeaderNames.SecWebsocketProtocol, out ICharSequence subprotocols) &&
subprotocols != null)
{
string selectedSubprotocol = this.SelectSubprotocol(subprotocols.ToString());
if (selectedSubprotocol == null)
{
if (Logger.DebugEnabled)
{
Logger.Debug("Requested subprotocol(s) not supported: {}", subprotocols);
}
}
else
{
res.Headers.Add(HttpHeaderNames.SecWebsocketProtocol, selectedSubprotocol);
}
}
return(res);
}
protected override IFullHttpRequest NewHandshakeRequest()
{
// Get path
Uri wsUrl = this.Uri;
string path = RawPath(wsUrl);
// Get 16 bit nonce and base 64 encode it
byte[] nonce = WebSocketUtil.RandomBytes(16);
string key = WebSocketUtil.Base64String(nonce);
string acceptSeed = key + MagicGuid;
byte[] sha1 = WebSocketUtil.Sha1(Encoding.ASCII.GetBytes(acceptSeed));
this.expectedChallengeResponseString = new AsciiString(WebSocketUtil.Base64String(sha1));
if (Logger.DebugEnabled)
{
Logger.Debug("WebSocket version 07 client handshake key: {}, expected response: {}",
key, this.expectedChallengeResponseString);
}
// Format request
var request = new DefaultFullHttpRequest(HttpVersion.Http11, HttpMethod.Get, path);
HttpHeaders headers = request.Headers;
headers.Add(HttpHeaderNames.Upgrade, HttpHeaderValues.Websocket)
.Add(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade)
.Add(HttpHeaderNames.SecWebsocketKey, key)
.Add(HttpHeaderNames.Host, WebsocketHostValue(wsUrl))
.Add(HttpHeaderNames.SecWebsocketOrigin, WebsocketOriginValue(wsUrl));
string expectedSubprotocol = this.ExpectedSubprotocol;
if (string.IsNullOrEmpty(expectedSubprotocol))
{
headers.Add(HttpHeaderNames.SecWebsocketProtocol, expectedSubprotocol);
}
headers.Add(HttpHeaderNames.SecWebsocketVersion, "7");
if (this.CustomHeaders != null)
{
headers.Add(this.CustomHeaders);
}
return(request);
}
