181 lines
6.5 KiB
Java
181 lines
6.5 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the 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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// (BSD License: http://www.opensource.org/licenses/bsd-license)
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//
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// Copyright (c) 2011, Joe Walnes and contributors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or
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// without modification, are permitted provided that the
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// following conditions are met:
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//
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// * Redistributions of source code must retain the above
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// copyright notice, this list of conditions and the
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// following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the
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// following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// * Neither the name of the Webbit nor the names of
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// its contributors may be used to endorse or promote products
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// derived from this software without specific prior written
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// permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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package io.netty.handler.codec.http.websocketx;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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import io.netty.handler.codec.TooLongFrameException;
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import io.netty.logging.InternalLogger;
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import io.netty.logging.InternalLoggerFactory;
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import java.nio.ByteBuffer;
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/**
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* <p>
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* Encodes a web socket frame into wire protocol version 8 format. This code was forked from <a
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* href="https://github.com/joewalnes/webbit">webbit</a> and modified.
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* </p>
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*/
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public class WebSocket08FrameEncoder extends MessageToByteEncoder<WebSocketFrame> {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(WebSocket08FrameEncoder.class);
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private static final byte OPCODE_CONT = 0x0;
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private static final byte OPCODE_TEXT = 0x1;
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private static final byte OPCODE_BINARY = 0x2;
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private static final byte OPCODE_CLOSE = 0x8;
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private static final byte OPCODE_PING = 0x9;
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private static final byte OPCODE_PONG = 0xA;
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private final boolean maskPayload;
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/**
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* Constructor
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*
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* @param maskPayload
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* Web socket clients must set this to true to mask payload. Server implementations must set this to
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* false.
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*/
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public WebSocket08FrameEncoder(boolean maskPayload) {
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this.maskPayload = maskPayload;
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}
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@Override
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public boolean isEncodable(Object msg) throws Exception {
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return msg instanceof WebSocketFrame;
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}
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@Override
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public void encode(ChannelHandlerContext ctx,
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WebSocketFrame msg, ByteBuf out) throws Exception {
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byte[] mask;
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ByteBuf data = msg.getBinaryData();
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if (data == null) {
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data = Unpooled.EMPTY_BUFFER;
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}
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byte opcode;
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if (msg instanceof TextWebSocketFrame) {
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opcode = OPCODE_TEXT;
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} else if (msg instanceof PingWebSocketFrame) {
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opcode = OPCODE_PING;
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} else if (msg instanceof PongWebSocketFrame) {
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opcode = OPCODE_PONG;
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} else if (msg instanceof CloseWebSocketFrame) {
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opcode = OPCODE_CLOSE;
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} else if (msg instanceof BinaryWebSocketFrame) {
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opcode = OPCODE_BINARY;
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} else if (msg instanceof ContinuationWebSocketFrame) {
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opcode = OPCODE_CONT;
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} else {
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throw new UnsupportedOperationException("Cannot encode frame of type: " + msg.getClass().getName());
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}
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int length = data.readableBytes();
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if (logger.isDebugEnabled()) {
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logger.debug("Encoding WebSocket Frame opCode=" + opcode + " length=" + length);
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}
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int b0 = 0;
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if (msg.isFinalFragment()) {
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b0 |= 1 << 7;
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}
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b0 |= msg.getRsv() % 8 << 4;
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b0 |= opcode % 128;
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if (opcode == OPCODE_PING && length > 125) {
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throw new TooLongFrameException("invalid payload for PING (payload length must be <= 125, was "
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+ length);
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}
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int maskLength = maskPayload ? 4 : 0;
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if (length <= 125) {
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out.ensureWritableBytes(2 + maskLength + length);
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out.writeByte(b0);
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byte b = (byte) (maskPayload ? 0x80 | (byte) length : (byte) length);
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out.writeByte(b);
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} else if (length <= 0xFFFF) {
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out.ensureWritableBytes(4 + maskLength + length);
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out.writeByte(b0);
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out.writeByte(maskPayload ? 0xFE : 126);
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out.writeByte(length >>> 8 & 0xFF);
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out.writeByte(length & 0xFF);
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} else {
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out.ensureWritableBytes(10 + maskLength + length);
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out.writeByte(b0);
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out.writeByte(maskPayload ? 0xFF : 127);
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out.writeLong(length);
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}
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// Write payload
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if (maskPayload) {
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int random = (int) (Math.random() * Integer.MAX_VALUE);
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mask = ByteBuffer.allocate(4).putInt(random).array();
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out.writeBytes(mask);
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int counter = 0;
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for (int i = data.readerIndex(); i < data.writerIndex(); i ++) {
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byte byteData = data.getByte(i);
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out.writeByte(byteData ^ mask[+counter++ % 4]);
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}
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} else {
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out.writeBytes(data, data.readerIndex(), data.readableBytes());
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}
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}
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}
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