@Override
protected void decode(
ChannelHandlerContext ctx, SpdyDataOrControlFrame msg, MessageBuf<Object> out)
throws Exception {
if (msg instanceof SpdySynStreamFrame) {
// HTTP requests/responses are mapped one-to-one to SPDY streams.
SpdySynStreamFrame spdySynStreamFrame = (SpdySynStreamFrame) msg;
int streamId = spdySynStreamFrame.getStreamId();
if (SpdyCodecUtil.isServerId(streamId)) {
// SYN_STREAM frames initiated by the server are pushed resources
int associatedToStreamId = spdySynStreamFrame.getAssociatedToStreamId();
// If a client receives a SYN_STREAM with an Associated-To-Stream-ID of 0
// it must reply with a RST_STREAM with error code INVALID_STREAM
if (associatedToStreamId == 0) {
SpdyRstStreamFrame spdyRstStreamFrame =
new DefaultSpdyRstStreamFrame(streamId, SpdyStreamStatus.INVALID_STREAM);
ctx.write(spdyRstStreamFrame);
}
String URL = SpdyHeaders.getUrl(spdyVersion, spdySynStreamFrame);
// If a client receives a SYN_STREAM without a 'url' header
// it must reply with a RST_STREAM with error code PROTOCOL_ERROR
if (URL == null) {
SpdyRstStreamFrame spdyRstStreamFrame =
new DefaultSpdyRstStreamFrame(streamId, SpdyStreamStatus.PROTOCOL_ERROR);
ctx.write(spdyRstStreamFrame);
}
try {
FullHttpResponse httpResponseWithEntity =
createHttpResponse(spdyVersion, spdySynStreamFrame);
// Set the Stream-ID, Associated-To-Stream-ID, Priority, and URL as headers
SpdyHttpHeaders.setStreamId(httpResponseWithEntity, streamId);
SpdyHttpHeaders.setAssociatedToStreamId(httpResponseWithEntity, associatedToStreamId);
SpdyHttpHeaders.setPriority(httpResponseWithEntity, spdySynStreamFrame.getPriority());
SpdyHttpHeaders.setUrl(httpResponseWithEntity, URL);
if (spdySynStreamFrame.isLast()) {
HttpHeaders.setContentLength(httpResponseWithEntity, 0);
out.add(httpResponseWithEntity);
} else {
// Response body will follow in a series of Data Frames
putMessage(streamId, httpResponseWithEntity);
}
} catch (Exception e) {
SpdyRstStreamFrame spdyRstStreamFrame =
new DefaultSpdyRstStreamFrame(streamId, SpdyStreamStatus.PROTOCOL_ERROR);
ctx.write(spdyRstStreamFrame);
}
} else {
// SYN_STREAM frames initiated by the client are HTTP requests
try {
FullHttpRequest httpRequestWithEntity =
createHttpRequest(spdyVersion, spdySynStreamFrame);
// Set the Stream-ID as a header
SpdyHttpHeaders.setStreamId(httpRequestWithEntity, streamId);
if (spdySynStreamFrame.isLast()) {
out.add(httpRequestWithEntity);
} else {
// Request body will follow in a series of Data Frames
putMessage(streamId, httpRequestWithEntity);
}
} catch (Exception e) {
// If a client sends a SYN_STREAM without all of the getMethod, url (host and path),
// scheme, and version headers the server must reply with a HTTP 400 BAD REQUEST reply.
// Also sends HTTP 400 BAD REQUEST reply if header name/value pairs are invalid
SpdySynReplyFrame spdySynReplyFrame = new DefaultSpdySynReplyFrame(streamId);
spdySynReplyFrame.setLast(true);
SpdyHeaders.setStatus(spdyVersion, spdySynReplyFrame, HttpResponseStatus.BAD_REQUEST);
SpdyHeaders.setVersion(spdyVersion, spdySynReplyFrame, HttpVersion.HTTP_1_0);
ctx.write(spdySynReplyFrame);
}
}
} else if (msg instanceof SpdySynReplyFrame) {
SpdySynReplyFrame spdySynReplyFrame = (SpdySynReplyFrame) msg;
int streamId = spdySynReplyFrame.getStreamId();
try {
FullHttpResponse httpResponseWithEntity =
createHttpResponse(spdyVersion, spdySynReplyFrame);
// Set the Stream-ID as a header
SpdyHttpHeaders.setStreamId(httpResponseWithEntity, streamId);
if (spdySynReplyFrame.isLast()) {
HttpHeaders.setContentLength(httpResponseWithEntity, 0);
out.add(httpResponseWithEntity);
} else {
// Response body will follow in a series of Data Frames
putMessage(streamId, httpResponseWithEntity);
}
} catch (Exception e) {
// If a client receives a SYN_REPLY without valid getStatus and version headers
// the client must reply with a RST_STREAM frame indicating a PROTOCOL_ERROR
SpdyRstStreamFrame spdyRstStreamFrame =
new DefaultSpdyRstStreamFrame(streamId, SpdyStreamStatus.PROTOCOL_ERROR);
ctx.write(spdyRstStreamFrame);
}
} else if (msg instanceof SpdyHeadersFrame) {
SpdyHeadersFrame spdyHeadersFrame = (SpdyHeadersFrame) msg;
int streamId = spdyHeadersFrame.getStreamId();
FullHttpMessage fullHttpMessage = getMessage(streamId);
// If message is not in map discard HEADERS frame.
if (fullHttpMessage == null) {
return;
}
for (Map.Entry<String, String> e : spdyHeadersFrame.headers().entries()) {
fullHttpMessage.headers().add(e.getKey(), e.getValue());
}
if (spdyHeadersFrame.isLast()) {
HttpHeaders.setContentLength(fullHttpMessage, fullHttpMessage.content().readableBytes());
removeMessage(streamId);
out.add(fullHttpMessage);
}
} else if (msg instanceof SpdyDataFrame) {
SpdyDataFrame spdyDataFrame = (SpdyDataFrame) msg;
int streamId = spdyDataFrame.getStreamId();
FullHttpMessage fullHttpMessage = getMessage(streamId);
// If message is not in map discard Data Frame.
if (fullHttpMessage == null) {
return;
}
ByteBuf content = fullHttpMessage.content();
if (content.readableBytes() > maxContentLength - spdyDataFrame.content().readableBytes()) {
removeMessage(streamId);
throw new TooLongFrameException(
"HTTP content length exceeded " + maxContentLength + " bytes.");
}
ByteBuf spdyDataFrameData = spdyDataFrame.content();
int spdyDataFrameDataLen = spdyDataFrameData.readableBytes();
content.writeBytes(spdyDataFrameData, spdyDataFrameData.readerIndex(), spdyDataFrameDataLen);
if (spdyDataFrame.isLast()) {
HttpHeaders.setContentLength(fullHttpMessage, content.readableBytes());
removeMessage(streamId);
out.add(fullHttpMessage);
}
} else if (msg instanceof SpdyRstStreamFrame) {
SpdyRstStreamFrame spdyRstStreamFrame = (SpdyRstStreamFrame) msg;
int streamId = spdyRstStreamFrame.getStreamId();
removeMessage(streamId);
}
}
@Override
protected void encode(ChannelHandlerContext ctx, Object msg, ByteBuf out) throws Exception {
if (msg instanceof SpdyDataFrame) {
SpdyDataFrame spdyDataFrame = (SpdyDataFrame) msg;
ByteBuf data = spdyDataFrame.data();
byte flags = spdyDataFrame.isLast() ? SPDY_DATA_FLAG_FIN : 0;
out.ensureWritable(SPDY_HEADER_SIZE + data.readableBytes());
out.writeInt(spdyDataFrame.getStreamId() & 0x7FFFFFFF);
out.writeByte(flags);
out.writeMedium(data.readableBytes());
out.writeBytes(data, data.readerIndex(), data.readableBytes());
} else if (msg instanceof SpdySynStreamFrame) {
SpdySynStreamFrame spdySynStreamFrame = (SpdySynStreamFrame) msg;
ByteBuf data = compressHeaderBlock(encodeHeaderBlock(version, spdySynStreamFrame));
byte flags = spdySynStreamFrame.isLast() ? SPDY_FLAG_FIN : 0;
if (spdySynStreamFrame.isUnidirectional()) {
flags |= SPDY_FLAG_UNIDIRECTIONAL;
}
int headerBlockLength = data.readableBytes();
int length;
if (version < 3) {
length = headerBlockLength == 0 ? 12 : 10 + headerBlockLength;
} else {
length = 10 + headerBlockLength;
}
out.ensureWritable(SPDY_HEADER_SIZE + length);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_SYN_STREAM_FRAME);
out.writeByte(flags);
out.writeMedium(length);
out.writeInt(spdySynStreamFrame.getStreamId());
out.writeInt(spdySynStreamFrame.getAssociatedToStreamId());
if (version < 3) {
// Restrict priorities for SPDY/2 to between 0 and 3
byte priority = spdySynStreamFrame.getPriority();
if (priority > 3) {
priority = 3;
}
out.writeShort((priority & 0xFF) << 14);
} else {
out.writeShort((spdySynStreamFrame.getPriority() & 0xFF) << 13);
}
if (version < 3 && data.readableBytes() == 0) {
out.writeShort(0);
}
out.writeBytes(data, data.readerIndex(), headerBlockLength);
} else if (msg instanceof SpdySynReplyFrame) {
SpdySynReplyFrame spdySynReplyFrame = (SpdySynReplyFrame) msg;
ByteBuf data = compressHeaderBlock(encodeHeaderBlock(version, spdySynReplyFrame));
byte flags = spdySynReplyFrame.isLast() ? SPDY_FLAG_FIN : 0;
int headerBlockLength = data.readableBytes();
int length;
if (version < 3) {
length = headerBlockLength == 0 ? 8 : 6 + headerBlockLength;
} else {
length = 4 + headerBlockLength;
}
out.ensureWritable(SPDY_HEADER_SIZE + length);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_SYN_REPLY_FRAME);
out.writeByte(flags);
out.writeMedium(length);
out.writeInt(spdySynReplyFrame.getStreamId());
if (version < 3) {
if (headerBlockLength == 0) {
out.writeInt(0);
} else {
out.writeShort(0);
}
}
out.writeBytes(data, data.readerIndex(), headerBlockLength);
} else if (msg instanceof SpdyRstStreamFrame) {
SpdyRstStreamFrame spdyRstStreamFrame = (SpdyRstStreamFrame) msg;
out.ensureWritable(SPDY_HEADER_SIZE + 8);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_RST_STREAM_FRAME);
out.writeInt(8);
out.writeInt(spdyRstStreamFrame.getStreamId());
out.writeInt(spdyRstStreamFrame.getStatus().getCode());
} else if (msg instanceof SpdySettingsFrame) {
SpdySettingsFrame spdySettingsFrame = (SpdySettingsFrame) msg;
byte flags = spdySettingsFrame.clearPreviouslyPersistedSettings() ? SPDY_SETTINGS_CLEAR : 0;
Set<Integer> IDs = spdySettingsFrame.getIds();
int numEntries = IDs.size();
int length = 4 + numEntries * 8;
out.ensureWritable(SPDY_HEADER_SIZE + length);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_SETTINGS_FRAME);
out.writeByte(flags);
out.writeMedium(length);
out.writeInt(numEntries);
for (Integer ID : IDs) {
int id = ID.intValue();
byte ID_flags = 0;
if (spdySettingsFrame.isPersistValue(id)) {
ID_flags |= SPDY_SETTINGS_PERSIST_VALUE;
}
if (spdySettingsFrame.isPersisted(id)) {
ID_flags |= SPDY_SETTINGS_PERSISTED;
}
if (version < 3) {
// Chromium Issue 79156
// SPDY setting ids are not written in network byte order
// Write id assuming the architecture is little endian
out.writeByte(id & 0xFF);
out.writeByte(id >> 8 & 0xFF);
out.writeByte(id >> 16 & 0xFF);
out.writeByte(ID_flags);
} else {
out.writeByte(ID_flags);
out.writeMedium(id);
}
out.writeInt(spdySettingsFrame.getValue(id));
}
} else if (msg instanceof SpdyNoOpFrame) {
out.ensureWritable(SPDY_HEADER_SIZE);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_NOOP_FRAME);
out.writeInt(0);
} else if (msg instanceof SpdyPingFrame) {
SpdyPingFrame spdyPingFrame = (SpdyPingFrame) msg;
out.ensureWritable(SPDY_HEADER_SIZE + 4);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_PING_FRAME);
out.writeInt(4);
out.writeInt(spdyPingFrame.getId());
} else if (msg instanceof SpdyGoAwayFrame) {
SpdyGoAwayFrame spdyGoAwayFrame = (SpdyGoAwayFrame) msg;
int length = version < 3 ? 4 : 8;
out.ensureWritable(SPDY_HEADER_SIZE + length);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_GOAWAY_FRAME);
out.writeInt(length);
out.writeInt(spdyGoAwayFrame.getLastGoodStreamId());
if (version >= 3) {
out.writeInt(spdyGoAwayFrame.getStatus().getCode());
}
} else if (msg instanceof SpdyHeadersFrame) {
SpdyHeadersFrame spdyHeadersFrame = (SpdyHeadersFrame) msg;
ByteBuf data = compressHeaderBlock(encodeHeaderBlock(version, spdyHeadersFrame));
byte flags = spdyHeadersFrame.isLast() ? SPDY_FLAG_FIN : 0;
int headerBlockLength = data.readableBytes();
int length;
if (version < 3) {
length = headerBlockLength == 0 ? 4 : 6 + headerBlockLength;
} else {
length = 4 + headerBlockLength;
}
out.ensureWritable(SPDY_HEADER_SIZE + length);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_HEADERS_FRAME);
out.writeByte(flags);
out.writeMedium(length);
out.writeInt(spdyHeadersFrame.getStreamId());
if (version < 3 && headerBlockLength != 0) {
out.writeShort(0);
}
out.writeBytes(data, data.readerIndex(), headerBlockLength);
} else if (msg instanceof SpdyWindowUpdateFrame) {
SpdyWindowUpdateFrame spdyWindowUpdateFrame = (SpdyWindowUpdateFrame) msg;
out.ensureWritable(SPDY_HEADER_SIZE + 8);
out.writeShort(version | 0x8000);
out.writeShort(SPDY_WINDOW_UPDATE_FRAME);
out.writeInt(8);
out.writeInt(spdyWindowUpdateFrame.getStreamId());
out.writeInt(spdyWindowUpdateFrame.getDeltaWindowSize());
} else {
throw new UnsupportedMessageTypeException(msg);
}
}