683 lines
24 KiB
Java
683 lines
24 KiB
Java
/*
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* Copyright 2009 Red Hat, Inc.
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*
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* Red Hat licenses this file to you under the Apache License, version 2.0
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* (the "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package org.jboss.netty.handler.codec.http;
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import java.util.List;
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import org.jboss.netty.buffer.ChannelBuffer;
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import org.jboss.netty.buffer.ChannelBuffers;
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import org.jboss.netty.channel.Channel;
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import org.jboss.netty.channel.ChannelHandlerContext;
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import org.jboss.netty.channel.ChannelPipeline;
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import org.jboss.netty.handler.codec.frame.TooLongFrameException;
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import org.jboss.netty.handler.codec.replay.ReplayingDecoder;
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/**
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* Decodes {@link ChannelBuffer}s into {@link HttpMessage}s and
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* {@link HttpChunk}s.
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*
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* <h3>Parameters that prevents excessive memory consumption</h3>
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* <table border="1">
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* <tr>
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* <th>Name</th><th>Meaning</th>
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* </tr>
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* <tr>
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* <td>{@code maxInitialLineLength}</td>
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* <td>The maximum length of the initial line
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* (e.g. {@code "GET / HTTP/1.0"} or {@code "HTTP/1.0 200 OK"})
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* If the length of the initial line exceeds this value, a
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* {@link TooLongFrameException} will be raised.</td>
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* </tr>
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* <tr>
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* <td>{@code maxHeaderSize}</td>
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* <td>The maximum length of all headers. If the sum of the length of each
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* header exceeds this value, a {@link TooLongFrameException} will be raised.</td>
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* </tr>
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* <tr>
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* <td>{@code maxChunkSize}</td>
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* <td>The maximum length of the content or each chunk. If the content length
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* (or the length of each chunk) exceeds this value, the content or chunk
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* will be split into multiple {@link HttpChunk}s whose length is
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* {@code maxChunkSize} at maximum.</td>
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* </tr>
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* </table>
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*
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* <h3>Chunked Content</h3>
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*
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* If the content of an HTTP message is greater than {@code maxChunkSize} or
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* the transfer encoding of the HTTP message is 'chunked', this decoder
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* generates one {@link HttpMessage} instance and its following
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* {@link HttpChunk}s per single HTTP message to avoid excessive memory
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* consumption. For example, the following HTTP message:
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* <pre>
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* GET / HTTP/1.1
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* Transfer-Encoding: chunked
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*
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* 1a
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* abcdefghijklmnopqrstuvwxyz
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* 10
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* 1234567890abcdef
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* 0
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* Content-MD5: ...
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* <i>[blank line]</i>
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* </pre>
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* triggers {@link HttpRequestDecoder} to generate 4 objects:
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* <ol>
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* <li>An {@link HttpRequest} whose {@link HttpMessage#isChunked() chunked}
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* property is {@code true},</li>
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* <li>The first {@link HttpChunk} whose content is {@code 'abcdefghijklmnopqrstuvwxyz'},</li>
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* <li>The second {@link HttpChunk} whose content is {@code '1234567890abcdef'}, and</li>
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* <li>An {@link HttpChunkTrailer} which marks the end of the content.</li>
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* </ol>
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*
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* If you prefer not to handle {@link HttpChunk}s by yourself for your
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* convenience, insert {@link HttpChunkAggregator} after this decoder in the
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* {@link ChannelPipeline}. However, please note that your server might not
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* be as memory efficient as without the aggregator.
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*
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* <h3>Extensibility</h3>
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*
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* Please note that this decoder is designed to be extended to implement
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* a protocol derived from HTTP, such as
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* <a href="http://en.wikipedia.org/wiki/Real_Time_Streaming_Protocol">RTSP</a> and
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* <a href="http://en.wikipedia.org/wiki/Internet_Content_Adaptation_Protocol">ICAP</a>.
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* To implement the decoder of such a derived protocol, extend this class and
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* implement all abstract methods properly.
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*
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* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
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* @author Andy Taylor (andy.taylor@jboss.org)
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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* @version $Rev$, $Date$
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*
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* @apiviz.landmark
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*/
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public abstract class HttpMessageDecoder extends ReplayingDecoder<HttpMessageDecoder.State> {
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private final int maxInitialLineLength;
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private final int maxHeaderSize;
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private final int maxChunkSize;
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private HttpMessage message;
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private ChannelBuffer content;
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private long chunkSize;
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private int headerSize;
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/**
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* The internal state of {@link HttpMessageDecoder}.
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* <em>Internal use only</em>.
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*
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* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
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* @author <a href="http://gleamynode.net/">Trustin Lee</a>
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* @version $Rev$, $Date$
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*
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* @apiviz.exclude
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*/
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protected static enum State {
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SKIP_CONTROL_CHARS,
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READ_INITIAL,
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READ_HEADER,
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READ_VARIABLE_LENGTH_CONTENT,
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READ_VARIABLE_LENGTH_CONTENT_AS_CHUNKS,
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READ_FIXED_LENGTH_CONTENT,
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READ_FIXED_LENGTH_CONTENT_AS_CHUNKS,
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READ_CHUNK_SIZE,
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READ_CHUNKED_CONTENT,
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READ_CHUNKED_CONTENT_AS_CHUNKS,
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READ_CHUNK_DELIMITER,
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READ_CHUNK_FOOTER;
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}
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/**
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* Creates a new instance with the default
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* {@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
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* {@code maxChunkSize (8192)}.
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*/
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protected HttpMessageDecoder() {
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this(4096, 8192, 8192);
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}
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/**
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* Creates a new instance with the specified parameters.
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*/
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protected HttpMessageDecoder(
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int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
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super(State.SKIP_CONTROL_CHARS, true);
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if (maxInitialLineLength <= 0) {
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throw new IllegalArgumentException(
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"maxInitialLineLength must be a positive integer: " +
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maxInitialLineLength);
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}
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if (maxHeaderSize <= 0) {
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throw new IllegalArgumentException(
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"maxHeaderSize must be a positive integer: " +
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maxChunkSize);
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}
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if (maxChunkSize < 0) {
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throw new IllegalArgumentException(
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"maxChunkSize must be a positive integer: " +
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maxChunkSize);
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}
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this.maxInitialLineLength = maxInitialLineLength;
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this.maxHeaderSize = maxHeaderSize;
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this.maxChunkSize = maxChunkSize;
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}
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@Override
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protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer, State state) throws Exception {
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switch (state) {
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case SKIP_CONTROL_CHARS: {
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try {
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skipControlCharacters(buffer);
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checkpoint(State.READ_INITIAL);
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} finally {
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checkpoint();
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}
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}
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case READ_INITIAL: {
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String[] initialLine = splitInitialLine(readLine(buffer, maxInitialLineLength));
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if (initialLine.length < 3) {
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// Invalid initial line - ignore.
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checkpoint(State.SKIP_CONTROL_CHARS);
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return null;
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}
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message = createMessage(initialLine);
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checkpoint(State.READ_HEADER);
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}
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case READ_HEADER: {
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State nextState = readHeaders(buffer);
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checkpoint(nextState);
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if (nextState == State.READ_CHUNK_SIZE) {
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// Chunked encoding
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message.setChunked(true);
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// Generate HttpMessage first. HttpChunks will follow.
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return message;
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} else if (nextState == State.SKIP_CONTROL_CHARS) {
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// No content is expected.
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// Remove the headers which are not supposed to be present not
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// to confuse subsequent handlers.
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message.removeHeader(HttpHeaders.Names.TRANSFER_ENCODING);
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return message;
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} else {
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long contentLength = HttpHeaders.getContentLength(message, -1);
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if (contentLength == 0 || contentLength == -1 && isDecodingRequest()) {
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content = ChannelBuffers.EMPTY_BUFFER;
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return reset();
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}
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switch (nextState) {
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case READ_FIXED_LENGTH_CONTENT:
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if (contentLength > maxChunkSize) {
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// Generate HttpMessage first. HttpChunks will follow.
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checkpoint(State.READ_FIXED_LENGTH_CONTENT_AS_CHUNKS);
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message.setChunked(true);
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// chunkSize will be decreased as the READ_FIXED_LENGTH_CONTENT_AS_CHUNKS
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// state reads data chunk by chunk.
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chunkSize = HttpHeaders.getContentLength(message, -1);
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return message;
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}
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break;
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case READ_VARIABLE_LENGTH_CONTENT:
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if (buffer.readableBytes() > maxChunkSize) {
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// Generate HttpMessage first. HttpChunks will follow.
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checkpoint(State.READ_VARIABLE_LENGTH_CONTENT_AS_CHUNKS);
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message.setChunked(true);
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return message;
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}
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break;
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}
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}
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// We return null here, this forces decode to be called again where we will decode the content
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return null;
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}
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case READ_VARIABLE_LENGTH_CONTENT: {
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if (content == null) {
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content = ChannelBuffers.dynamicBuffer(channel.getConfig().getBufferFactory());
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}
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//this will cause a replay error until the channel is closed where this will read what's left in the buffer
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content.writeBytes(buffer.readBytes(buffer.readableBytes()));
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return reset();
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}
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case READ_VARIABLE_LENGTH_CONTENT_AS_CHUNKS: {
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// Keep reading data as a chunk until the end of connection is reached.
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int chunkSize = Math.min(maxChunkSize, buffer.readableBytes());
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HttpChunk chunk = new DefaultHttpChunk(buffer.readBytes(chunkSize));
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if (!buffer.readable()) {
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// Reached to the end of the connection.
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reset();
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if (!chunk.isLast()) {
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// Append the last chunk.
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return new Object[] { chunk, HttpChunk.LAST_CHUNK };
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}
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}
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return chunk;
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}
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case READ_FIXED_LENGTH_CONTENT: {
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//we have a content-length so we just read the correct number of bytes
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readFixedLengthContent(buffer);
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return reset();
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}
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case READ_FIXED_LENGTH_CONTENT_AS_CHUNKS: {
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long chunkSize = this.chunkSize;
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HttpChunk chunk;
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if (chunkSize > maxChunkSize) {
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chunk = new DefaultHttpChunk(buffer.readBytes(maxChunkSize));
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chunkSize -= maxChunkSize;
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} else {
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assert chunkSize <= Integer.MAX_VALUE;
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chunk = new DefaultHttpChunk(buffer.readBytes((int) chunkSize));
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chunkSize = 0;
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}
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this.chunkSize = chunkSize;
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if (chunkSize == 0) {
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// Read all content.
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reset();
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if (!chunk.isLast()) {
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// Append the last chunk.
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return new Object[] { chunk, HttpChunk.LAST_CHUNK };
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}
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}
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return chunk;
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}
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/**
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* everything else after this point takes care of reading chunked content. basically, read chunk size,
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* read chunk, read and ignore the CRLF and repeat until 0
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*/
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case READ_CHUNK_SIZE: {
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String line = readLine(buffer, maxInitialLineLength);
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int chunkSize = getChunkSize(line);
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this.chunkSize = chunkSize;
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if (chunkSize == 0) {
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checkpoint(State.READ_CHUNK_FOOTER);
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return null;
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} else if (chunkSize > maxChunkSize) {
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// A chunk is too large. Split them into multiple chunks again.
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checkpoint(State.READ_CHUNKED_CONTENT_AS_CHUNKS);
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} else {
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checkpoint(State.READ_CHUNKED_CONTENT);
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}
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}
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case READ_CHUNKED_CONTENT: {
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assert chunkSize <= Integer.MAX_VALUE;
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HttpChunk chunk = new DefaultHttpChunk(buffer.readBytes((int) chunkSize));
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checkpoint(State.READ_CHUNK_DELIMITER);
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return chunk;
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}
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case READ_CHUNKED_CONTENT_AS_CHUNKS: {
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long chunkSize = this.chunkSize;
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HttpChunk chunk;
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if (chunkSize > maxChunkSize) {
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chunk = new DefaultHttpChunk(buffer.readBytes(maxChunkSize));
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chunkSize -= maxChunkSize;
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} else {
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assert chunkSize <= Integer.MAX_VALUE;
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chunk = new DefaultHttpChunk(buffer.readBytes((int) chunkSize));
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chunkSize = 0;
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}
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this.chunkSize = chunkSize;
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if (chunkSize == 0) {
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// Read all content.
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checkpoint(State.READ_CHUNK_DELIMITER);
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}
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if (!chunk.isLast()) {
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return chunk;
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}
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}
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case READ_CHUNK_DELIMITER: {
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for (;;) {
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byte next = buffer.readByte();
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if (next == HttpCodecUtil.CR) {
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if (buffer.readByte() == HttpCodecUtil.LF) {
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checkpoint(State.READ_CHUNK_SIZE);
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return null;
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}
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} else if (next == HttpCodecUtil.LF) {
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checkpoint(State.READ_CHUNK_SIZE);
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return null;
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}
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}
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}
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case READ_CHUNK_FOOTER: {
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HttpChunkTrailer trailer = readTrailingHeaders(buffer);
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if (maxChunkSize == 0) {
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// Chunked encoding disabled.
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return reset();
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} else {
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reset();
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// The last chunk, which is empty
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return trailer;
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}
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}
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default: {
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throw new Error("Shouldn't reach here.");
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}
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}
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}
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protected boolean isContentAlwaysEmpty(HttpMessage msg) {
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if (msg instanceof HttpResponse) {
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HttpResponse res = (HttpResponse) msg;
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int code = res.getStatus().getCode();
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if (code < 200) {
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return true;
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}
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switch (code) {
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case 204: case 205: case 304:
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return true;
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}
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}
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return false;
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}
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private Object reset() {
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HttpMessage message = this.message;
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ChannelBuffer content = this.content;
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if (content != null) {
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message.setContent(content);
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this.content = null;
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}
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this.message = null;
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checkpoint(State.SKIP_CONTROL_CHARS);
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return message;
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}
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private void skipControlCharacters(ChannelBuffer buffer) {
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for (;;) {
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char c = (char) buffer.readUnsignedByte();
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if (!Character.isISOControl(c) &&
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!Character.isWhitespace(c)) {
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buffer.readerIndex(buffer.readerIndex() - 1);
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break;
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}
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}
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}
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private void readFixedLengthContent(ChannelBuffer buffer) {
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long length = HttpHeaders.getContentLength(message, -1);
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assert length <= Integer.MAX_VALUE;
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if (content == null) {
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content = buffer.readBytes((int) length);
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} else {
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content.writeBytes(buffer.readBytes((int) length));
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}
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}
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private State readHeaders(ChannelBuffer buffer) throws TooLongFrameException {
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headerSize = 0;
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final HttpMessage message = this.message;
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String line = readHeader(buffer);
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String name = null;
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String value = null;
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if (line.length() != 0) {
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message.clearHeaders();
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do {
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char firstChar = line.charAt(0);
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if (name != null && (firstChar == ' ' || firstChar == '\t')) {
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value = value + ' ' + line.trim();
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} else {
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if (name != null) {
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message.addHeader(name, value);
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}
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String[] header = splitHeader(line);
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name = header[0];
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value = header[1];
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}
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line = readHeader(buffer);
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} while (line.length() != 0);
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// Add the last header.
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if (name != null) {
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message.addHeader(name, value);
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}
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}
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State nextState;
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if (isContentAlwaysEmpty(message)) {
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nextState = State.SKIP_CONTROL_CHARS;
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} else if (message.isChunked()) {
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// HttpMessage.isChunked() returns true when either:
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// 1) HttpMessage.setChunked(true) was called or
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// 2) 'Transfer-Encoding' is 'chunked'.
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// Because this decoder did not call HttpMessage.setChunked(true)
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// yet, HttpMessage.isChunked() should return true only when
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// 'Transfer-Encoding' is 'chunked'.
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nextState = State.READ_CHUNK_SIZE;
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} else if (HttpHeaders.getContentLength(message, -1) >= 0) {
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nextState = State.READ_FIXED_LENGTH_CONTENT;
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} else {
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nextState = State.READ_VARIABLE_LENGTH_CONTENT;
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}
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return nextState;
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}
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private HttpChunkTrailer readTrailingHeaders(ChannelBuffer buffer) throws TooLongFrameException {
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headerSize = 0;
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String line = readHeader(buffer);
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String lastHeader = null;
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if (line.length() != 0) {
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HttpChunkTrailer trailer = new DefaultHttpChunkTrailer();
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do {
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char firstChar = line.charAt(0);
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if (lastHeader != null && (firstChar == ' ' || firstChar == '\t')) {
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List<String> current = trailer.getHeaders(lastHeader);
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if (current.size() != 0) {
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int lastPos = current.size() - 1;
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String newString = current.get(lastPos) + line.trim();
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current.set(lastPos, newString);
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} else {
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// Content-Length, Transfer-Encoding, or Trailer
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}
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} else {
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String[] header = splitHeader(line);
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String name = header[0];
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if (!name.equalsIgnoreCase(HttpHeaders.Names.CONTENT_LENGTH) &&
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!name.equalsIgnoreCase(HttpHeaders.Names.TRANSFER_ENCODING) &&
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!name.equalsIgnoreCase(HttpHeaders.Names.TRAILER)) {
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trailer.addHeader(name, header[1]);
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}
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lastHeader = name;
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}
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line = readHeader(buffer);
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} while (line.length() != 0);
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return trailer;
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}
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return HttpChunk.LAST_CHUNK;
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}
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private String readHeader(ChannelBuffer buffer) throws TooLongFrameException {
|
|
StringBuilder sb = new StringBuilder(64);
|
|
int headerSize = this.headerSize;
|
|
|
|
loop:
|
|
for (;;) {
|
|
char nextByte = (char) buffer.readByte();
|
|
headerSize ++;
|
|
|
|
switch (nextByte) {
|
|
case HttpCodecUtil.CR:
|
|
nextByte = (char) buffer.readByte();
|
|
headerSize ++;
|
|
if (nextByte == HttpCodecUtil.LF) {
|
|
break loop;
|
|
}
|
|
break;
|
|
case HttpCodecUtil.LF:
|
|
break loop;
|
|
}
|
|
|
|
// Abort decoding if the header part is too large.
|
|
if (headerSize >= maxHeaderSize) {
|
|
throw new TooLongFrameException(
|
|
"HTTP header is larger than " +
|
|
maxHeaderSize + " bytes.");
|
|
|
|
}
|
|
|
|
sb.append(nextByte);
|
|
}
|
|
|
|
this.headerSize = headerSize;
|
|
return sb.toString();
|
|
}
|
|
|
|
protected abstract boolean isDecodingRequest();
|
|
protected abstract HttpMessage createMessage(String[] initialLine) throws Exception;
|
|
|
|
private int getChunkSize(String hex) {
|
|
hex = hex.trim();
|
|
for (int i = 0; i < hex.length(); i ++) {
|
|
char c = hex.charAt(i);
|
|
if (c == ';' || Character.isWhitespace(c) || Character.isISOControl(c)) {
|
|
hex = hex.substring(0, i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return Integer.parseInt(hex, 16);
|
|
}
|
|
|
|
private String readLine(ChannelBuffer buffer, int maxLineLength) throws TooLongFrameException {
|
|
StringBuilder sb = new StringBuilder(64);
|
|
int lineLength = 0;
|
|
while (true) {
|
|
byte nextByte = buffer.readByte();
|
|
if (nextByte == HttpCodecUtil.CR) {
|
|
nextByte = buffer.readByte();
|
|
if (nextByte == HttpCodecUtil.LF) {
|
|
return sb.toString();
|
|
}
|
|
}
|
|
else if (nextByte == HttpCodecUtil.LF) {
|
|
return sb.toString();
|
|
}
|
|
else {
|
|
if (lineLength >= maxLineLength) {
|
|
throw new TooLongFrameException(
|
|
"An HTTP line is larger than " + maxLineLength +
|
|
" bytes.");
|
|
}
|
|
lineLength ++;
|
|
sb.append((char) nextByte);
|
|
}
|
|
}
|
|
}
|
|
|
|
private String[] splitInitialLine(String sb) {
|
|
int aStart;
|
|
int aEnd;
|
|
int bStart;
|
|
int bEnd;
|
|
int cStart;
|
|
int cEnd;
|
|
|
|
aStart = findNonWhitespace(sb, 0);
|
|
aEnd = findWhitespace(sb, aStart);
|
|
|
|
bStart = findNonWhitespace(sb, aEnd);
|
|
bEnd = findWhitespace(sb, bStart);
|
|
|
|
cStart = findNonWhitespace(sb, bEnd);
|
|
cEnd = findEndOfString(sb);
|
|
|
|
return new String[] {
|
|
sb.substring(aStart, aEnd),
|
|
sb.substring(bStart, bEnd),
|
|
cStart < cEnd? sb.substring(cStart, cEnd) : "" };
|
|
}
|
|
|
|
private String[] splitHeader(String sb) {
|
|
final int length = sb.length();
|
|
int nameStart;
|
|
int nameEnd;
|
|
int colonEnd;
|
|
int valueStart;
|
|
int valueEnd;
|
|
|
|
nameStart = findNonWhitespace(sb, 0);
|
|
for (nameEnd = nameStart; nameEnd < length; nameEnd ++) {
|
|
char ch = sb.charAt(nameEnd);
|
|
if (ch == ':' || Character.isWhitespace(ch)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (colonEnd = nameEnd; colonEnd < length; colonEnd ++) {
|
|
if (sb.charAt(colonEnd) == ':') {
|
|
colonEnd ++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
valueStart = findNonWhitespace(sb, colonEnd);
|
|
if (valueStart == length) {
|
|
return new String[] {
|
|
sb.substring(nameStart, nameEnd),
|
|
""
|
|
};
|
|
}
|
|
|
|
valueEnd = findEndOfString(sb);
|
|
return new String[] {
|
|
sb.substring(nameStart, nameEnd),
|
|
sb.substring(valueStart, valueEnd)
|
|
};
|
|
}
|
|
|
|
private int findNonWhitespace(String sb, int offset) {
|
|
int result;
|
|
for (result = offset; result < sb.length(); result ++) {
|
|
if (!Character.isWhitespace(sb.charAt(result))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private int findWhitespace(String sb, int offset) {
|
|
int result;
|
|
for (result = offset; result < sb.length(); result ++) {
|
|
if (Character.isWhitespace(sb.charAt(result))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
private int findEndOfString(String sb) {
|
|
int result;
|
|
for (result = sb.length(); result > 0; result --) {
|
|
if (!Character.isWhitespace(sb.charAt(result - 1))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
}
|