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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.spdy;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageDecoder;
import io.netty.handler.codec.TooLongFrameException;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpMessage;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMessage;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import java.util.HashMap;
import java.util.Map;
/**
* Decodes {@link SpdySynStreamFrame}s, {@link SpdySynReplyFrame}s,
* and {@link SpdyDataFrame}s into {@link FullHttpRequest}s and {@link FullHttpResponse}s.
*/
public class SpdyHttpDecoder extends MessageToMessageDecoder {
private final int spdyVersion;
private final int maxContentLength;
private final Map messageMap = new HashMap();
/**
* Creates a new instance.
*
* @param version the protocol version
* @param maxContentLength the maximum length of the message content.
* If the length of the message content exceeds this value,
* a {@link TooLongFrameException} will be raised.
*/
public SpdyHttpDecoder(int version, int maxContentLength) {
if (version < SpdyConstants.SPDY_MIN_VERSION || version > SpdyConstants.SPDY_MAX_VERSION) {
throw new IllegalArgumentException(
"unsupported version: " + version);
}
if (maxContentLength <= 0) {
throw new IllegalArgumentException(
"maxContentLength must be a positive integer: " + maxContentLength);
}
spdyVersion = version;
this.maxContentLength = maxContentLength;
}
@Override
protected Object decode(ChannelHandlerContext ctx, SpdyDataOrControlFrame msg) 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);
return httpResponseWithEntity;
} else {
// Response body will follow in a series of Data Frames
messageMap.put(Integer.valueOf(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()) {
return httpRequestWithEntity;
} else {
// Request body will follow in a series of Data Frames
messageMap.put(Integer.valueOf(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);
return httpResponseWithEntity;
} else {
// Response body will follow in a series of Data Frames
messageMap.put(Integer.valueOf(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;
Integer streamID = Integer.valueOf(spdyHeadersFrame.getStreamId());
HttpMessage httpMessage = messageMap.get(streamID);
// If message is not in map discard HEADERS frame.
// SpdySessionHandler should prevent this from happening.
if (httpMessage == null) {
return null;
}
for (Map.Entry e: spdyHeadersFrame.headers().entries()) {
httpMessage.headers().add(e.getKey(), e.getValue());
}
} else if (msg instanceof SpdyDataFrame) {
SpdyDataFrame spdyDataFrame = (SpdyDataFrame) msg;
Integer streamID = Integer.valueOf(spdyDataFrame.getStreamId());
FullHttpMessage fullHttpMessage = messageMap.get(streamID);
// If message is not in map discard Data Frame.
// SpdySessionHandler should prevent this from happening.
if (fullHttpMessage == null) {
return null;
}
ByteBuf content = fullHttpMessage.data();
if (content.readableBytes() > maxContentLength - spdyDataFrame.data().readableBytes()) {
messageMap.remove(streamID);
throw new TooLongFrameException(
"HTTP content length exceeded " + maxContentLength + " bytes.");
}
ByteBuf spdyDataFrameData = spdyDataFrame.data();
int spdyDataFrameDataLen = spdyDataFrameData.readableBytes();
content.writeBytes(spdyDataFrameData, spdyDataFrameData.readerIndex(), spdyDataFrameDataLen);
if (spdyDataFrame.isLast()) {
HttpHeaders.setContentLength(fullHttpMessage, content.readableBytes());
messageMap.remove(streamID);
return fullHttpMessage;
}
} else if (msg instanceof SpdyRstStreamFrame) {
SpdyRstStreamFrame spdyRstStreamFrame = (SpdyRstStreamFrame) msg;
Integer streamID = Integer.valueOf(spdyRstStreamFrame.getStreamId());
messageMap.remove(streamID);
}
return null;
}
private static FullHttpRequest createHttpRequest(int spdyVersion, SpdyHeaderBlock requestFrame)
throws Exception {
// Create the first line of the request from the name/value pairs
HttpMethod method = SpdyHeaders.getMethod(spdyVersion, requestFrame);
String url = SpdyHeaders.getUrl(spdyVersion, requestFrame);
HttpVersion httpVersion = SpdyHeaders.getVersion(spdyVersion, requestFrame);
SpdyHeaders.removeMethod(spdyVersion, requestFrame);
SpdyHeaders.removeUrl(spdyVersion, requestFrame);
SpdyHeaders.removeVersion(spdyVersion, requestFrame);
FullHttpRequest req = new DefaultFullHttpRequest(httpVersion, method, url);
// Remove the scheme header
SpdyHeaders.removeScheme(spdyVersion, requestFrame);
if (spdyVersion >= 3) {
// Replace the SPDY host header with the HTTP host header
String host = SpdyHeaders.getHost(requestFrame);
SpdyHeaders.removeHost(requestFrame);
HttpHeaders.setHost(req, host);
}
for (Map.Entry e: requestFrame.headers().entries()) {
req.headers().add(e.getKey(), e.getValue());
}
// The Connection and Keep-Alive headers are no longer valid
HttpHeaders.setKeepAlive(req, true);
// Transfer-Encoding header is not valid
req.headers().remove(HttpHeaders.Names.TRANSFER_ENCODING);
return req;
}
private static FullHttpResponse createHttpResponse(int spdyVersion, SpdyHeaderBlock responseFrame)
throws Exception {
// Create the first line of the response from the name/value pairs
HttpResponseStatus status = SpdyHeaders.getStatus(spdyVersion, responseFrame);
HttpVersion version = SpdyHeaders.getVersion(spdyVersion, responseFrame);
SpdyHeaders.removeStatus(spdyVersion, responseFrame);
SpdyHeaders.removeVersion(spdyVersion, responseFrame);
FullHttpResponse res = new DefaultFullHttpResponse(version, status);
for (Map.Entry e: responseFrame.headers().entries()) {
res.headers().add(e.getKey(), e.getValue());
}
// The Connection and Keep-Alive headers are no longer valid
HttpHeaders.setKeepAlive(res, true);
// Transfer-Encoding header is not valid
res.headers().remove(HttpHeaders.Names.TRANSFER_ENCODING);
res.headers().remove(HttpHeaders.Names.TRAILER);
return res;
}
}
