/*
 * 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:
 *
 *   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.socks;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
import io.netty.handler.codec.socks.SocksAuthRequestDecoder.State;

import java.util.List;

Decodes ByteBufs into SocksAuthRequest. Before returning SocksRequest decoder removes itself from pipeline.
/** * Decodes {@link ByteBuf}s into {@link SocksAuthRequest}. * Before returning SocksRequest decoder removes itself from pipeline. */
public class SocksAuthRequestDecoder extends ReplayingDecoder<State> { private String username; public SocksAuthRequestDecoder() { super(State.CHECK_PROTOCOL_VERSION); } @Override protected void decode(ChannelHandlerContext ctx, ByteBuf byteBuf, List<Object> out) throws Exception { switch (state()) { case CHECK_PROTOCOL_VERSION: { if (byteBuf.readByte() != SocksSubnegotiationVersion.AUTH_PASSWORD.byteValue()) { out.add(SocksCommonUtils.UNKNOWN_SOCKS_REQUEST); break; } checkpoint(State.READ_USERNAME); } case READ_USERNAME: { int fieldLength = byteBuf.readByte(); username = SocksCommonUtils.readUsAscii(byteBuf, fieldLength); checkpoint(State.READ_PASSWORD); } case READ_PASSWORD: { int fieldLength = byteBuf.readByte(); String password = SocksCommonUtils.readUsAscii(byteBuf, fieldLength); out.add(new SocksAuthRequest(username, password)); break; } default: { throw new Error(); } } ctx.pipeline().remove(this); } enum State { CHECK_PROTOCOL_VERSION, READ_USERNAME, READ_PASSWORD } }