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/*
 * Copyright 2015 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.rtsp;

import java.util.regex.Pattern;

import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.DefaultHttpRequest;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.HttpMessage;
import io.netty.handler.codec.http.HttpObjectDecoder;
import io.netty.handler.codec.http.HttpResponseStatus;

/**
 * Decodes {@link io.netty.buffer.ByteBuf}s into RTSP messages represented in
 * {@link HttpMessage}s.
 * 

*

Parameters that prevents excessive memory consumption

* * * * * * * * * * * * * * * * *
NameMeaning
{@code maxInitialLineLength}The maximum length of the initial line * (e.g. {@code "SETUP / RTSP/1.0"} or {@code "RTSP/1.0 200 OK"}) * If the length of the initial line exceeds this value, a * {@link io.netty.handler.codec.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 io.netty.handler.codec.TooLongFrameException} will be * raised.
{@code maxContentLength}The maximum length of the content. If the content length exceeds this * value, a {@link io.netty.handler.codec.TooLongFrameException} will be raised.
*/ public class RtspDecoder extends HttpObjectDecoder { /** * Status code for unknown responses. */ private static final HttpResponseStatus UNKNOWN_STATUS = new HttpResponseStatus(999, "Unknown"); /** * True if the message to decode is a request. * False if the message to decode is a response. */ private boolean isDecodingRequest; /** * Regex used on first line in message to detect if it is a response. */ private static final Pattern versionPattern = Pattern.compile("RTSP/\\d\\.\\d"); /** * Constant for default max content length. */ public static final int DEFAULT_MAX_CONTENT_LENGTH = 8192; /** * Creates a new instance with the default * {@code maxInitialLineLength (4096)}, {@code maxHeaderSize (8192)}, and * {@code maxContentLength (8192)}. */ public RtspDecoder() { this(DEFAULT_MAX_INITIAL_LINE_LENGTH, DEFAULT_MAX_HEADER_SIZE, DEFAULT_MAX_CONTENT_LENGTH); } /** * Creates a new instance with the specified parameters. * @param maxInitialLineLength The max allowed length of initial line * @param maxHeaderSize The max allowed size of header * @param maxContentLength The max allowed content length */ public RtspDecoder(final int maxInitialLineLength, final int maxHeaderSize, final int maxContentLength) { super(maxInitialLineLength, maxHeaderSize, maxContentLength * 2, false); } /** * Creates a new instance with the specified parameters. * @param maxInitialLineLength The max allowed length of initial line * @param maxHeaderSize The max allowed size of header * @param maxContentLength The max allowed content length * @param validateHeaders Set to true if headers should be validated */ public RtspDecoder(final int maxInitialLineLength, final int maxHeaderSize, final int maxContentLength, final boolean validateHeaders) { super(maxInitialLineLength, maxHeaderSize, maxContentLength * 2, false, validateHeaders); } @Override protected HttpMessage createMessage(final String[] initialLine) throws Exception { // If the first element of the initial line is a version string then // this is a response if (versionPattern.matcher(initialLine[0]).matches()) { isDecodingRequest = false; return new DefaultHttpResponse(RtspVersions.valueOf(initialLine[0]), new HttpResponseStatus(Integer.parseInt(initialLine[1]), initialLine[2]), validateHeaders); } else { isDecodingRequest = true; return new DefaultHttpRequest(RtspVersions.valueOf(initialLine[2]), RtspMethods.valueOf(initialLine[0]), initialLine[1], validateHeaders); } } @Override protected boolean isContentAlwaysEmpty(final HttpMessage msg) { // Unlike HTTP, RTSP always assumes zero-length body if Content-Length // header is absent. return super.isContentAlwaysEmpty(msg) || !msg.headers().contains(RtspHeaderNames.CONTENT_LENGTH); } @Override protected HttpMessage createInvalidMessage() { if (isDecodingRequest) { return new DefaultFullHttpRequest(RtspVersions.RTSP_1_0, RtspMethods.OPTIONS, "/bad-request", validateHeaders); } else { return new DefaultFullHttpResponse(RtspVersions.RTSP_1_0, UNKNOWN_STATUS, validateHeaders); } } @Override protected boolean isDecodingRequest() { return isDecodingRequest; } }




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