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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:
*
* https://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.http;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.TooLongFrameException;
/**
* Decodes {@link ByteBuf}s into {@link HttpRequest}s and {@link HttpContent}s.
*
*
Parameters that prevents excessive memory consumption
*
*
*
Name
Meaning
*
*
*
{@code maxInitialLineLength}
*
The maximum length of the initial line (e.g. {@code "GET / HTTP/1.0"})
* If the length of the initial line exceeds this value, a
* {@link TooLongFrameException} will be raised.
*
*
*
{@code maxHeaderSize}
*
The maximum length of all headers. If the sum of the length of each
* header exceeds this value, a {@link TooLongFrameException} will be raised.
*
*
*
{@code maxChunkSize}
*
The maximum length of the content or each chunk. If the content length
* exceeds this value, the transfer encoding of the decoded request will be
* converted to 'chunked' and the content will be split into multiple
* {@link HttpContent}s. If the transfer encoding of the HTTP request is
* 'chunked' already, each chunk will be split into smaller chunks if the
* length of the chunk exceeds this value. If you prefer not to handle
* {@link HttpContent}s in your handler, insert {@link HttpObjectAggregator}
* after this decoder in the {@link ChannelPipeline}.
*
*
*
*
Parameters that control parsing behavior
*
*
*
Name
Default value
Meaning
*
*
*
{@code allowDuplicateContentLengths}
*
{@value #DEFAULT_ALLOW_DUPLICATE_CONTENT_LENGTHS}
*
When set to {@code false}, will reject any messages that contain multiple Content-Length header fields.
* When set to {@code true}, will allow multiple Content-Length headers only if they are all the same decimal value.
* The duplicated field-values will be replaced with a single valid Content-Length field.
* See RFC 7230, Section 3.3.2.
*
*
*
{@code allowPartialChunks}
*
{@value #DEFAULT_ALLOW_PARTIAL_CHUNKS}
*
If the length of a chunk exceeds the {@link ByteBuf}s readable bytes and {@code allowPartialChunks}
* is set to {@code true}, the chunk will be split into multiple {@link HttpContent}s.
* Otherwise, if the chunk size does not exceed {@code maxChunkSize} and {@code allowPartialChunks}
* is set to {@code false}, the {@link ByteBuf} is not decoded into an {@link HttpContent} until
* the readable bytes are greater or equal to the chunk size.
*
*
*/
public class HttpRequestDecoder extends HttpObjectDecoder {
/**
* Creates a new instance with the default
* {@code maxInitialLineLength (4096)}, {@code maxHeaderSize (8192)}, and
* {@code maxChunkSize (8192)}.
*/
public HttpRequestDecoder() {
}
/**
* Creates a new instance with the specified parameters.
*/
public HttpRequestDecoder(
int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED);
}
public HttpRequestDecoder(
int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders) {
super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders);
}
public HttpRequestDecoder(
int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders,
int initialBufferSize) {
super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders,
initialBufferSize);
}
public HttpRequestDecoder(
int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders,
int initialBufferSize, boolean allowDuplicateContentLengths) {
super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders,
initialBufferSize, allowDuplicateContentLengths);
}
public HttpRequestDecoder(
int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders,
int initialBufferSize, boolean allowDuplicateContentLengths, boolean allowPartialChunks) {
super(maxInitialLineLength, maxHeaderSize, maxChunkSize, DEFAULT_CHUNKED_SUPPORTED, validateHeaders,
initialBufferSize, allowDuplicateContentLengths, allowPartialChunks);
}
@Override
protected HttpMessage createMessage(String[] initialLine) throws Exception {
return new DefaultHttpRequest(
HttpVersion.valueOf(initialLine[2]),
HttpMethod.valueOf(initialLine[0]), initialLine[1], validateHeaders);
}
@Override
protected HttpMessage createInvalidMessage() {
return new DefaultFullHttpRequest(HttpVersion.HTTP_1_0, HttpMethod.GET, "/bad-request", validateHeaders);
}
@Override
protected boolean isDecodingRequest() {
return true;
}
}
