internal void AddHeaders(IHeadersFrame newFrame)
{
if (newFrame == null)
{
return;
}
if (!_wasFirstFrameReceived && !(newFrame is HeadersFrame) && !(newFrame is PushPromiseFrame))
{
throw new ProtocolError(ResetStatusCode.ProtocolError, "Continuation was not precessed by the headers");
}
_wasFirstFrameReceived = true;
if (newFrame is IEndStreamFrame && !WasEndStreamReceived)
{
WasEndStreamReceived = (newFrame as IEndStreamFrame).IsEndStream;
}
headers.AddRange(newFrame.Headers);
if ((newFrame is HeadersFrame && newFrame.IsEndHeaders) ||
(newFrame is ContinuationFrame && newFrame.IsEndHeaders) ||
newFrame is PushPromiseFrame && (newFrame as PushPromiseFrame).IsEndHeaders)
{
IsComplete = true;
}
}
/// <summary>
/// Decompress the headers.
/// </summary>
/// <param name="serializedHeaders">The serialised headers.</param>
/// <returns>The header list.</returns>
public HeadersList Decompress(byte[] serializedHeaders)
{
try
{
_currentOffset = 0;
var unindexedHeadersList = new HeadersList();
while (_currentOffset != serializedHeaders.Length)
{
var entry = ParseHeader(serializedHeaders);
// parsed indexed header which was already in the refSet
if (entry == null)
{
continue;
}
var header = new KeyValuePair <string, string>(entry.Item1, entry.Item2);
if (entry.Item3 == IndexationType.WithoutIndexation ||
entry.Item3 == IndexationType.NeverIndexed)
{
unindexedHeadersList.Add(header);
}
}
// Base result on already modified reference set
var result = new HeadersList(_localRefSet);
// Add to result Without indexation and Never Indexed
// They were not added into reference set
result.AddRange(unindexedHeadersList);
ProcessCookie(result);
return(result);
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
/// <summary>
/// Dispatches the incoming frame.
/// </summary>
/// <param name="frame">The frame.</param>
/// <exception cref="System.NotImplementedException"></exception>
private void DispatchIncomingFrame(Frame frame)
{
Http2Stream stream = null;
//Spec 03 tells that frame with continues flag MUST be followed by a frame with the same type
//and the same stread id.
if (_toBeContinuedHeaders.Count != 0)
{
if (_toBeContinuedFrame.FrameType != frame.FrameType
|| _toBeContinuedFrame.StreamId != frame.StreamId)
{
//If not, we must close the session.
Dispose();
return;
}
}
try
{
switch (frame.FrameType)
{
case FrameType.Headers:
Http2Logger.LogDebug("New headers with id = " + frame.StreamId);
var headersFrame = (HeadersFrame)frame;
var serializedHeaders = new byte[headersFrame.CompressedHeaders.Count];
Buffer.BlockCopy(headersFrame.CompressedHeaders.Array,
headersFrame.CompressedHeaders.Offset,
serializedHeaders, 0, serializedHeaders.Length);
var decompressedHeaders = _comprProc.Decompress(serializedHeaders);
var headers = new HeadersList(decompressedHeaders);
if (!headersFrame.IsEndHeaders)
{
_toBeContinuedHeaders.AddRange(decompressedHeaders);
_toBeContinuedFrame = headersFrame;
break;
}
headers.AddRange(_toBeContinuedHeaders);
_toBeContinuedHeaders.Clear();
_toBeContinuedFrame = null;
headersFrame.Headers.AddRange(headers);
foreach (var header in headers)
{
Http2Logger.LogDebug("Stream {0} header: {1}={2}", frame.StreamId, header.Key, header.Value);
}
stream = GetStream(headersFrame.StreamId);
if (stream == null)
{
if (_ourEnd == ConnectionEnd.Server)
{
string path = headers.GetValue(":path");
if (path == null)
{
path = _handshakeHeaders.ContainsKey(":path")
? _handshakeHeaders[":path"]
: @"\index.html";
headers.Add(new KeyValuePair<string, string>(":path", path));
}
}
else
{
headers.AddRange(_handshakeHeaders);
}
stream = CreateStream(headers, frame.StreamId);
}
break;
case FrameType.Priority:
var priorityFrame = (PriorityFrame)frame;
Http2Logger.LogDebug("Priority frame. StreamId: {0} Priority: {1}", priorityFrame.StreamId, priorityFrame.Priority);
stream = GetStream(priorityFrame.StreamId);
if (_usePriorities)
{
stream.Priority = priorityFrame.Priority;
}
break;
case FrameType.RstStream:
var resetFrame = (RstStreamFrame)frame;
stream = GetStream(resetFrame.StreamId);
if (stream != null)
{
Http2Logger.LogDebug("RST frame with code " + resetFrame.StatusCode);
stream.Dispose();
}
break;
case FrameType.Data:
var dataFrame = (DataFrame)frame;
Http2Logger.LogDebug("Data frame. StreamId:{0} Length:{1}", dataFrame.StreamId, dataFrame.FrameLength);
stream = GetStream(dataFrame.StreamId);
//Aggressive window update
if (stream != null && stream.IsFlowControlEnabled)
{
stream.WriteWindowUpdate(InitialWindowSize);
}
break;
case FrameType.Ping:
var pingFrame = (PingFrame)frame;
Http2Logger.LogDebug("Ping frame with StreamId:{0} Payload:{1}", pingFrame.StreamId, pingFrame.Payload.Count);
if (pingFrame.FrameLength != PingFrame.PayloadLength)
{
throw new ProtocolError(ResetStatusCode.ProtocolError, "Ping payload size is not equal to 8");
}
if (pingFrame.IsPong)
{
_wasPingReceived = true;
_pingReceived.Set();
}
else
{
var pongFrame = new PingFrame(true, pingFrame.Payload.ToArray());
_writeQueue.WriteFrame(pongFrame);
}
break;
case FrameType.Settings:
//Not first frame in the session.
//Client initiates connection and sends settings before request.
//It means that if server sent settings before it will not be a first frame,
//because client initiates connection.
if (_ourEnd == ConnectionEnd.Server && !_wasSettingsReceived
&& (ActiveStreams.Count > 0))
{
Dispose();
return;
}
var settingFrame = (SettingsFrame)frame;
Http2Logger.LogDebug("Settings frame. Entry count: {0} StreamId: {1}", settingFrame.EntryCount, settingFrame.StreamId);
_wasSettingsReceived = true;
_settingsManager.ProcessSettings(settingFrame, this, _flowControlManager);
if (_ourEnd == ConnectionEnd.Server && _sessionSocket.SecureProtocol == SecureProtocol.None)
{
//The HTTP/1.1 request that is sent prior to upgrade is associated with
//stream 1 and is assigned the highest possible priority. Stream 1 is
//implicitly half closed from the client toward the server, since the
//request is completed as an HTTP/1.1 request. After commencing the
//HTTP/2.0 connection, stream 1 is used for the response.
stream = CreateStream(Priority.Pri0);
stream.EndStreamReceived = true;
stream.Headers.Add(new KeyValuePair<string, string>(":method", _handshakeHeaders[":method"]));
stream.Headers.Add(new KeyValuePair<string, string>(":path", _handshakeHeaders[":path"]));
OnFrameReceived(this, new FrameReceivedEventArgs(stream, new HeadersFrame(stream.Id, false)));
}
break;
case FrameType.WindowUpdate:
if (_useFlowControl)
{
var windowFrame = (WindowUpdateFrame)frame;
Http2Logger.LogDebug("WindowUpdate frame. Delta: {0} StreamId: {1}", windowFrame.Delta, windowFrame.StreamId);
stream = GetStream(windowFrame.StreamId);
if (stream != null)
{
stream.UpdateWindowSize(windowFrame.Delta);
stream.PumpUnshippedFrames();
}
}
break;
case FrameType.GoAway:
_goAwayReceived = true;
Http2Logger.LogDebug("GoAway frame received");
Dispose();
break;
default:
throw new NotImplementedException(frame.FrameType.ToString());
}
if (stream != null && frame is IEndStreamFrame && ((IEndStreamFrame)frame).IsEndStream)
{
//Tell the stream that it was the last frame
Http2Logger.LogDebug("Final frame received for stream with id = " + stream.Id);
stream.EndStreamReceived = true;
}
if (stream != null && OnFrameReceived != null)
{
OnFrameReceived(this, new FrameReceivedEventArgs(stream, frame));
}
}
//Frame came for already closed stream. Ignore it.
//Spec:
//An endpoint that sends RST_STREAM MUST ignore
//frames that it receives on closed streams if it sends RST_STREAM.
//
//An endpoint MUST NOT send frames on a closed stream. An endpoint
//that receives a frame after receiving a RST_STREAM or a frame
//containing a END_STREAM flag on that stream MUST treat that as a
//stream error (Section 5.4.2) of type PROTOCOL_ERROR.
catch (Http2StreamNotFoundException)
{
if (stream != null)
{
stream.WriteRst(ResetStatusCode.ProtocolError);
}
else
{
//GoAway?
}
}
catch (CompressionError ex)
{
//The endpoint is unable to maintain the compression context for the connection.
Http2Logger.LogError("Compression error occurred: " + ex.Message);
Close(ResetStatusCode.CompressionError);
}
catch (ProtocolError pEx)
{
Http2Logger.LogError("Protocol error occurred: " + pEx.Message);
Close(pEx.Code);
}
}
public HeadersList Decompress(byte[] serializedHeaders)
{
try
{
var workingSet = new HeadersList(_localRefSet);
var unindexedHeadersList = new HeadersList();
_currentOffset = 0;
while (_currentOffset != serializedHeaders.Length)
{
var entry = ParseHeader(serializedHeaders);
var header = new KeyValuePair<string, string>(entry.Item1, entry.Item2);
if (entry.Item3 == IndexationType.Indexed)
{
if (workingSet.Contains(header))
workingSet.RemoveAll(h => h.Equals(header));
else
workingSet.Add(header);
}
else if (entry.Item3 == IndexationType.WithoutIndexation)
{
unindexedHeadersList.Add(header);
}
else
{
workingSet.Add(header);
}
}
_localRefSet = new HeadersList(workingSet);
for (int i = _localRefSet.Count - 1; i >= 0; --i)
{
var header = _localRefSet[i];
if (!_localHeaderTable.Contains(header))
_localRefSet.RemoveAll(h => h.Equals(header));
}
workingSet.AddRange(unindexedHeadersList);
return workingSet;
}
catch (Exception e)
{
throw new CompressionError(e);
}
}
public HeadersList Decompress(byte[] serializedHeaders)
{
try
{
_currentOffset = 0;
var unindexedHeadersList = new HeadersList();
while (_currentOffset != serializedHeaders.Length)
{
var entry = ParseHeader(serializedHeaders);
// parsed indexed header which was already in the refSet
if (entry == null)
continue;
var header = new KeyValuePair<string, string>(entry.Item1, entry.Item2);
if (entry.Item3 == IndexationType.WithoutIndexation ||
entry.Item3 == IndexationType.NeverIndexed)
{
unindexedHeadersList.Add(header);
}
}
// Base result on already modified reference set
var result = new HeadersList(_localRefSet);
// Add to result Without indexation and Never Indexed
// They were not added into reference set
result.AddRange(unindexedHeadersList);
ProcessCookie(result);
return result;
}
catch (Exception e)
{
throw new CompressionError(e.Message);
}
}
/// <summary>
/// Writes the status header to the stream.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="statusCode">The status code.</param>
/// <param name="final">if set to <c>true</c> then marks headers frame as final.</param>
/// <param name="additionalHeaders">The additional headers.</param>
private void WriteStatus(Http2Stream stream, int statusCode, bool final, HeadersList additionalHeaders = null)
{
var headers = new HeadersList
{
new KeyValuePair<string, string>(CommonHeaders.Status, statusCode.ToString()),
};
if (additionalHeaders != null)
{
headers.AddRange(additionalHeaders);
}
stream.WriteHeadersFrame(headers, final, true);
}