/// <summary>
/// Process a continuation frame request.
/// </summary>
/// <param name="httpContext">The current http context.</param>
/// <param name="continuationFrame">The continuation frame.</param>
/// <param name="stream">The selected stream context.</param>
/// <param name="canPassContext">Can the data be sent to the client context.</param>
private static void ProcessContinuationFrameRequest(Nequeo.Net.Http2.HttpContext httpContext,
ContinuationFrame continuationFrame, out ContextStream stream, out bool canPassContext)
{
// The data can be sent to the client
// through the http context session.
canPassContext = false;
/* CONTINUATION frames MUST be associated with a stream. If a CONTINUATION
* frame is received whose stream identifier field is 0x0, the recipient MUST
* respond with a connection error of type PROTOCOL_ERROR. */
if (continuationFrame.StreamId == 0)
{
throw new ProtocolError(ErrorCodeRegistry.Protocol_Error, "Incoming continuation frame with stream id is equal to 0.");
}
// Attempt to get the sepcific stream.
stream = httpContext.GetStream(continuationFrame.StreamId);
if (stream == null)
{
throw new MaxConcurrentStreamsLimitException();
}
// Get the number of compressed headers.
var serializedHeaders = new byte[continuationFrame.CompressedHeaders.Count];
// Copy the compressed frame.
Buffer.BlockCopy(continuationFrame.CompressedHeaders.Array, continuationFrame.CompressedHeaders.Offset, serializedHeaders, 0, serializedHeaders.Length);
// Decompress the compressed headers.
HeadersList decompressedHeaders = new HeaderCompression().Decompress(serializedHeaders);
HeadersList headers = new HeadersList(decompressedHeaders);
// Add the list of headers.
foreach (KeyValuePair <string, string> header in headers)
{
stream.HttpRequest.OriginalHeaders.Add(new NameValue()
{
Name = header.Key, Value = header.Value
});
}
// Determine if all headers have been found.
if (continuationFrame.IsEndHeaders)
{
// The end of the headers has been found.
stream.HttpRequest.HeadersFound = true;
}
bool wasValidated = false;
// Check the current stream state.
if (stream.Idle || stream.ReservedRemote)
{
// Validate all the headers.
httpContext.ValidateHeaders(stream);
wasValidated = true;
}
else if (stream.Opened || stream.HalfClosedLocal)
{
// Validate all the headers.
httpContext.ValidateHeaders(stream);
wasValidated = true;
}
else if (stream.HalfClosedRemote)
{
// Half closed remote stream.
throw new ProtocolError(ErrorCodeRegistry.Protocol_Error, "Continuation for half closed remote stream.");
}
else
{
// Stream has no state error.
throw new StreamNotFoundException(continuationFrame.StreamId);
}
// If the headers where validated.
if (wasValidated)
{
// If headers have been found.
if (stream.HttpRequest.HeadersFound)
{
// Set the current stream id
httpContext.StreamId = stream.StreamId;
stream.HttpRequest.IsEndOfData = continuationFrame.IsEndStream;
// Get the request resources.
RequestResource resource = Nequeo.Net.Http2.Utility.GetRequestResource(stream.HttpRequest.OriginalHeaders);
// Assign the http request content.
stream.HttpRequest.ReadRequestHeaders(stream.HttpRequest.OriginalHeaders, resource);
// If this is the last bit of data
// that has been sent then sent
// the data to the client context.
if (continuationFrame.IsEndStream)
{
canPassContext = true;
}
}
}
}
private void HandleContinuation(ContinuationFrame contFrame, out Http2Stream stream)
{
Http2Logger.LogDebug("CONTINUATION frame: stream id={0}, payload len={1}, has pad={2}, pad high={3}," +
" pad low={4}, end headers={5}", contFrame.StreamId, contFrame.PayloadLength,
contFrame.HasPadding, contFrame.PadHigh, contFrame.PadLow, contFrame.IsEndHeaders);
if (!(_lastFrame is ContinuationFrame || _lastFrame is HeadersFrame))
{
throw new ProtocolError(ResetStatusCode.ProtocolError,
"Last frame was not headers or continuation");
}
/* 12 -> 6.10
* CONTINUATION frames MUST be associated with a stream. If a CONTINUATION
* frame is received whose stream identifier field is 0x0, the recipient MUST
* respond with a connection error of type PROTOCOL_ERROR. */
if (contFrame.StreamId == 0)
{
throw new ProtocolError(ResetStatusCode.ProtocolError,
"Incoming continuation frame with stream id=0");
}
var serHeaders = new byte[contFrame.CompressedHeaders.Count];
Buffer.BlockCopy(contFrame.CompressedHeaders.Array,
contFrame.CompressedHeaders.Offset,
serHeaders, 0, serHeaders.Length);
var decomprHeaders = _comprProc.Decompress(serHeaders);
var contHeaders = new HeadersList(decomprHeaders);
foreach (var header in contHeaders)
{
Http2Logger.LogDebug("Stream {0} header: {1}={2}", contFrame.StreamId, header.Key, header.Value);
}
contFrame.Headers.AddRange(contHeaders);
var sequence = _headersSequences.Find(contFrame.StreamId);
if (sequence == null)
{
sequence = new HeadersSequence(contFrame.StreamId, contFrame);
_headersSequences.Add(sequence);
}
else
{
sequence.AddHeaders(contFrame);
}
if (!sequence.IsComplete)
{
stream = null;
return;
}
stream = GetStream(contFrame.StreamId);
if (stream.Idle || stream.ReservedRemote)
{
stream = CreateStream(sequence);
ValidateHeaders(stream);
}
else if (stream.Opened || stream.HalfClosedLocal)
{
stream.Headers = sequence.Headers;//Modify by the last accepted frame
ValidateHeaders(stream);
}
else if (stream.HalfClosedRemote)
{
throw new ProtocolError(ResetStatusCode.ProtocolError, "continuation for half closed remote stream");
}
else
{
throw new Http2StreamNotFoundException(contFrame.StreamId);
}
}
public ContinuationFrameList(ContinuationFrame first, ContinuationFrameList rest)
{
this.first = first;
this.rest = rest;
}