/*
* Copyright 2013 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.HttpMethod;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import java.util.HashMap;
import java.util.List;
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<SpdyFrame> {
private final boolean validateHeaders;
private final int spdyVersion;
private final int maxContentLength;
private final Map<Integer, FullHttpMessage> messageMap;
/**
* 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(SpdyVersion version, int maxContentLength) {
this(version, maxContentLength, new HashMap<Integer, FullHttpMessage>(), true);
}
/**
* 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.
* @param validateHeaders {@code true} if http headers should be validated
*/
public SpdyHttpDecoder(SpdyVersion version, int maxContentLength, boolean validateHeaders) {
this(version, maxContentLength, new HashMap<Integer, FullHttpMessage>(), validateHeaders);
}
/**
* Creates a new instance with the specified parameters.
*
* @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.
* @param messageMap the {@link Map} used to hold partially received messages.
*/
protected SpdyHttpDecoder(SpdyVersion version, int maxContentLength, Map<Integer, FullHttpMessage> messageMap) {
this(version, maxContentLength, messageMap, true);
}
/**
* Creates a new instance with the specified parameters.
*
* @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.
* @param messageMap the {@link Map} used to hold partially received messages.
* @param validateHeaders {@code true} if http headers should be validated
*/
protected SpdyHttpDecoder(SpdyVersion version, int maxContentLength, Map<Integer,
FullHttpMessage> messageMap, boolean validateHeaders) {
if (version == null) {
throw new NullPointerException("version");
}
if (maxContentLength <= 0) {
throw new IllegalArgumentException(
"maxContentLength must be a positive integer: " + maxContentLength);
}
spdyVersion = version.getVersion();
this.maxContentLength = maxContentLength;
this.messageMap = messageMap;
this.validateHeaders = validateHeaders;
}
protected FullHttpMessage putMessage(int streamId, FullHttpMessage message) {
return messageMap.put(streamId, message);
}
protected FullHttpMessage getMessage(int streamId) {
return messageMap.get(streamId);
}
protected FullHttpMessage removeMessage(int streamId) {
return messageMap.remove(streamId);
}
@Override
protected void decode(ChannelHandlerContext ctx, SpdyFrame msg, List<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.streamId();
if (SpdyCodecUtil.isServerId(streamId)) {
// SYN_STREAM frames initiated by the server are pushed resources
int associatedToStreamId = spdySynStreamFrame.associatedStreamId();
// 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.writeAndFlush(spdyRstStreamFrame);
return;
}
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.writeAndFlush(spdyRstStreamFrame);
return;
}
// If a client receives a response with a truncated header block,
// reply with a RST_STREAM with error code INTERNAL_ERROR.
if (spdySynStreamFrame.isTruncated()) {
SpdyRstStreamFrame spdyRstStreamFrame =
new DefaultSpdyRstStreamFrame(streamId, SpdyStreamStatus.INTERNAL_ERROR);
ctx.writeAndFlush(spdyRstStreamFrame);
return;
}
try {
FullHttpResponse httpResponseWithEntity =
createHttpResponse(ctx, spdyVersion, spdySynStreamFrame, validateHeaders);
// 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.priority());
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.writeAndFlush(spdyRstStreamFrame);
}
} else {
// SYN_STREAM frames initiated by the client are HTTP requests
// If a client sends a request with a truncated header block, the server must
// reply with a HTTP 431 REQUEST HEADER FIELDS TOO LARGE reply.
if (spdySynStreamFrame.isTruncated()) {
SpdySynReplyFrame spdySynReplyFrame = new DefaultSpdySynReplyFrame(streamId);
spdySynReplyFrame.setLast(true);
SpdyHeaders.setStatus(spdyVersion,
spdySynReplyFrame,
HttpResponseStatus.REQUEST_HEADER_FIELDS_TOO_LARGE);
SpdyHeaders.setVersion(spdyVersion, spdySynReplyFrame, HttpVersion.HTTP_1_0);
ctx.writeAndFlush(spdySynReplyFrame);
return;
}
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.writeAndFlush(spdySynReplyFrame);
}
}
} else if (msg instanceof SpdySynReplyFrame) {
SpdySynReplyFrame spdySynReplyFrame = (SpdySynReplyFrame) msg;
int streamId = spdySynReplyFrame.streamId();
// If a client receives a SYN_REPLY with a truncated header block,
// reply with a RST_STREAM frame with error code INTERNAL_ERROR.
if (spdySynReplyFrame.isTruncated()) {
SpdyRstStreamFrame spdyRstStreamFrame =
new DefaultSpdyRstStreamFrame(streamId, SpdyStreamStatus.INTERNAL_ERROR);
ctx.writeAndFlush(spdyRstStreamFrame);
return;
}
try {
FullHttpResponse httpResponseWithEntity =
createHttpResponse(ctx, spdyVersion, spdySynReplyFrame, validateHeaders);
// 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.writeAndFlush(spdyRstStreamFrame);
}
} else if (msg instanceof SpdyHeadersFrame) {
SpdyHeadersFrame spdyHeadersFrame = (SpdyHeadersFrame) msg;
int streamId = spdyHeadersFrame.streamId();
FullHttpMessage fullHttpMessage = getMessage(streamId);
// If message is not in map discard HEADERS frame.
if (fullHttpMessage == null) {
return;
}
// Ignore trailers in a truncated HEADERS frame.
if (!spdyHeadersFrame.isTruncated()) {
for (Map.Entry<String, String> e: spdyHeadersFrame.headers()) {
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.streamId();
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.streamId();
removeMessage(streamId);
}
}
private static FullHttpRequest createHttpRequest(int spdyVersion, SpdyHeadersFrame requestFrame)
throws Exception {
// Create the first line of the request from the name/value pairs
SpdyHeaders headers = requestFrame.headers();
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);
// Replace the SPDY host header with the HTTP host header
String host = headers.get(SpdyHeaders.HttpNames.HOST);
headers.remove(SpdyHeaders.HttpNames.HOST);
req.headers().set(HttpHeaders.Names.HOST, host);
for (Map.Entry<String, String> e: requestFrame.headers()) {
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(ChannelHandlerContext ctx, int spdyVersion,
SpdyHeadersFrame responseFrame,
boolean validateHeaders) 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, ctx.alloc().buffer(), validateHeaders);
for (Map.Entry<String, String> e: responseFrame.headers()) {
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;
}
}