protected override IFullHttpResponse NewHandshakeResponse(IFullHttpRequest req, HttpHeaders headers)
{
// Serve the WebSocket handshake request.
if (!req.Headers.ContainsValue(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade, true) ||
!req.Headers.TryGet(HttpHeaderNames.Upgrade, out ICharSequence value) ||
!HttpHeaderValues.Websocket.ContentEqualsIgnoreCase(value))
{
throw new WebSocketHandshakeException("not a WebSocket handshake request: missing upgrade");
}
// Hixie 75 does not contain these headers while Hixie 76 does
bool isHixie76 = req.Headers.Contains(HttpHeaderNames.SecWebsocketKey1) &&
req.Headers.Contains(HttpHeaderNames.SecWebsocketKey2);
// Create the WebSocket handshake response.
var res = new DefaultFullHttpResponse(HttpVersion.Http11,
new HttpResponseStatus(101, new AsciiString(isHixie76 ? "WebSocket Protocol Handshake" : "Web Socket Protocol Handshake")));
if (headers != null)
{
res.Headers.Add(headers);
}
res.Headers.Add(HttpHeaderNames.Upgrade, HttpHeaderValues.Websocket);
res.Headers.Add(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade);
// Fill in the headers and contents depending on handshake getMethod.
if (isHixie76)
{
// New handshake getMethod with a challenge:
value = req.Headers.Get(HttpHeaderNames.Origin, null);
Debug.Assert(value != null);
res.Headers.Add(HttpHeaderNames.SecWebsocketOrigin, value);
res.Headers.Add(HttpHeaderNames.SecWebsocketLocation, this.Uri);
if (req.Headers.TryGet(HttpHeaderNames.SecWebsocketProtocol, out ICharSequence subprotocols))
{
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);
}
}
// Calculate the answer of the challenge.
value = req.Headers.Get(HttpHeaderNames.SecWebsocketKey1, null);
Debug.Assert(value != null, $"{HttpHeaderNames.SecWebsocketKey1} must exist");
string key1 = value.ToString();
value = req.Headers.Get(HttpHeaderNames.SecWebsocketKey2, null);
Debug.Assert(value != null, $"{HttpHeaderNames.SecWebsocketKey2} must exist");
string key2 = value.ToString();
int a = (int)(long.Parse(BeginningDigit.Replace(key1, "")) /
BeginningSpace.Replace(key1, "").Length);
int b = (int)(long.Parse(BeginningDigit.Replace(key2, "")) /
BeginningSpace.Replace(key2, "").Length);
long c = req.Content.ReadLong();
IByteBuffer input = Unpooled.Buffer(16);
input.WriteInt(a);
input.WriteInt(b);
input.WriteLong(c);
res.Content.WriteBytes(WebSocketUtil.Md5(input.Array));
}
else
{
// Old Hixie 75 handshake getMethod with no challenge:
value = req.Headers.Get(HttpHeaderNames.Origin, null);
Debug.Assert(value != null);
res.Headers.Add(HttpHeaderNames.WebsocketOrigin, value);
res.Headers.Add(HttpHeaderNames.WebsocketLocation, this.Uri);
if (req.Headers.TryGet(HttpHeaderNames.WebsocketProtocol, out ICharSequence protocol))
{
res.Headers.Add(HttpHeaderNames.WebsocketProtocol, this.SelectSubprotocol(protocol.ToString()));
}
}
return(res);
}
protected internal override unsafe IFullHttpRequest NewHandshakeRequest()
{
// Make keys
int spaces1 = WebSocketUtil.RandomNumber(1, 12);
int spaces2 = WebSocketUtil.RandomNumber(1, 12);
int max1 = int.MaxValue / spaces1;
int max2 = int.MaxValue / spaces2;
int number1 = WebSocketUtil.RandomNumber(0, max1);
int number2 = WebSocketUtil.RandomNumber(0, max2);
int product1 = number1 * spaces1;
int product2 = number2 * spaces2;
string key1 = Convert.ToString(product1);
string key2 = Convert.ToString(product2);
key1 = InsertRandomCharacters(key1);
key2 = InsertRandomCharacters(key2);
key1 = InsertSpaces(key1, spaces1);
key2 = InsertSpaces(key2, spaces2);
byte[] key3 = WebSocketUtil.RandomBytes(8);
var challenge = new byte[16];
fixed(byte *bytes = challenge)
{
Unsafe.WriteUnaligned(bytes, number1);
Unsafe.WriteUnaligned(bytes + 4, number2);
PlatformDependent.CopyMemory(key3, 0, bytes + 8, 8);
}
this.expectedChallengeResponseBytes = Unpooled.WrappedBuffer(WebSocketUtil.Md5(challenge));
// Get path
Uri wsUrl = this.Uri;
string path = RawPath(wsUrl);
// Format request
var request = new DefaultFullHttpRequest(HttpVersion.Http11, HttpMethod.Get, path);
HttpHeaders headers = request.Headers;
headers.Add(HttpHeaderNames.Upgrade, Websocket)
.Add(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade)
.Add(HttpHeaderNames.Host, WebsocketHostValue(wsUrl))
.Add(HttpHeaderNames.Origin, WebsocketOriginValue(wsUrl))
.Add(HttpHeaderNames.SecWebsocketKey1, key1)
.Add(HttpHeaderNames.SecWebsocketKey2, key2);
string expectedSubprotocol = this.ExpectedSubprotocol;
if (!string.IsNullOrEmpty(expectedSubprotocol))
{
headers.Add(HttpHeaderNames.SecWebsocketProtocol, expectedSubprotocol);
}
if (this.CustomHeaders != null)
{
headers.Add(this.CustomHeaders);
}
// Set Content-Length to workaround some known defect.
// See also: http://www.ietf.org/mail-archive/web/hybi/current/msg02149.html
headers.Set(HttpHeaderNames.ContentLength, key3.Length);
request.Content.WriteBytes(key3);
return(request);
}
/// <summary>
/// <para>
/// Handle the web socket handshake for the web socket specification <a href=
/// "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-00">HyBi version 0</a> and lower. This standard
/// is really a rehash of <a href="http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76" >hixie-76</a> and
/// <a href="http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-75" >hixie-75</a>.
/// </para>
///
/// <para>
/// Browser request to the server:
/// </para>
///
/// <![CDATA[
/// GET /demo HTTP/1.1
/// Upgrade: WebSocket
/// Connection: Upgrade
/// Host: example.com
/// Origin: http://example.com
/// Sec-WebSocket-Protocol: chat, sample
/// Sec-WebSocket-Key1: 4 @1 46546xW%0l 1 5
/// Sec-WebSocket-Key2: 12998 5 Y3 1 .P00
///
/// ^n:ds[4U
/// ]]>
///
/// <para>
/// Server response:
/// </para>
///
/// <![CDATA[
/// HTTP/1.1 101 WebSocket Protocol Handshake
/// Upgrade: WebSocket
/// Connection: Upgrade
/// Sec-WebSocket-Origin: http://example.com
/// Sec-WebSocket-Location: ws://example.com/demo
/// Sec-WebSocket-Protocol: sample
///
/// 8jKS'y:G*Co,Wxa-
/// ]]>
/// </summary>
/// <param name="req"></param>
/// <param name="headers"></param>
/// <returns></returns>
protected override IFullHttpResponse NewHandshakeResponse(IFullHttpRequest req, HttpHeaders headers)
{
// Serve the WebSocket handshake request.
if (!req.Headers.ContainsValue(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade, true) ||
!req.Headers.TryGet(HttpHeaderNames.Upgrade, out ICharSequence value) ||
!HttpHeaderValues.Websocket.ContentEqualsIgnoreCase(value))
{
ThrowHelper.ThrowWebSocketHandshakeException_MissingUpgrade();
}
// Hixie 75 does not contain these headers while Hixie 76 does
bool isHixie76 = req.Headers.Contains(HttpHeaderNames.SecWebsocketKey1) &&
req.Headers.Contains(HttpHeaderNames.SecWebsocketKey2);
var origin = req.Headers.Get(HttpHeaderNames.Origin, null);
//throw before allocating FullHttpResponse
if (origin is null && !isHixie76)
{
ThrowHelper.ThrowWebSocketHandshakeException_Missing_origin_header(req);
}
// Create the WebSocket handshake response.
var res = new DefaultFullHttpResponse(HttpVersion.Http11, new HttpResponseStatus(101,
new AsciiString(isHixie76 ? "WebSocket Protocol Handshake" : "Web Socket Protocol Handshake")),
req.Content.Allocator.Buffer(0));
if (headers is object)
{
_ = res.Headers.Add(headers);
}
_ = res.Headers.Add(HttpHeaderNames.Upgrade, HttpHeaderValues.Websocket);
_ = res.Headers.Add(HttpHeaderNames.Connection, HttpHeaderValues.Upgrade);
// Fill in the headers and contents depending on handshake getMethod.
if (isHixie76)
{
// New handshake getMethod with a challenge:
_ = res.Headers.Add(HttpHeaderNames.SecWebsocketOrigin, origin);
_ = res.Headers.Add(HttpHeaderNames.SecWebsocketLocation, this.Uri);
if (req.Headers.TryGet(HttpHeaderNames.SecWebsocketProtocol, out ICharSequence subprotocols))
{
string selectedSubprotocol = this.SelectSubprotocol(subprotocols.ToString());
if (selectedSubprotocol is null)
{
if (Logger.DebugEnabled)
{
Logger.RequestedSubprotocolNotSupported(subprotocols);
}
}
else
{
_ = res.Headers.Add(HttpHeaderNames.SecWebsocketProtocol, selectedSubprotocol);
}
}
// Calculate the answer of the challenge.
value = req.Headers.Get(HttpHeaderNames.SecWebsocketKey1, null);
Debug.Assert(value is object, $"{HttpHeaderNames.SecWebsocketKey1} must exist");
string key1 = value.ToString();
value = req.Headers.Get(HttpHeaderNames.SecWebsocketKey2, null);
Debug.Assert(value is object, $"{HttpHeaderNames.SecWebsocketKey2} must exist");
string key2 = value.ToString();
int a = (int)(long.Parse(BeginningDigit.Replace(key1, "")) /
BeginningSpace.Replace(key1, "").Length);
int b = (int)(long.Parse(BeginningDigit.Replace(key2, "")) /
BeginningSpace.Replace(key2, "").Length);
long c = req.Content.ReadLong();
IByteBuffer input = Unpooled.WrappedBuffer(new byte[16]).SetIndex(0, 0);
_ = input.WriteInt(a);
_ = input.WriteInt(b);
_ = input.WriteLong(c);
_ = res.Content.WriteBytes(WebSocketUtil.Md5(input.Array));
}
else
{
// Old Hixie 75 handshake getMethod with no challenge:
_ = res.Headers.Add(HttpHeaderNames.WebsocketOrigin, origin);
_ = res.Headers.Add(HttpHeaderNames.WebsocketLocation, this.Uri);
if (req.Headers.TryGet(HttpHeaderNames.WebsocketProtocol, out ICharSequence protocol))
{
_ = res.Headers.Add(HttpHeaderNames.WebsocketProtocol, this.SelectSubprotocol(protocol.ToString()));
}
}
return(res);
}
