85 lines
3.4 KiB
Java
85 lines
3.4 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2021 ViaVersion and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.viaversion.viaversion.velocity.handlers;
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import com.viaversion.viaversion.api.connection.UserConnection;
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import com.viaversion.viaversion.exception.CancelCodecException;
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import com.viaversion.viaversion.exception.CancelDecoderException;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPipeline;
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import io.netty.handler.codec.MessageToMessageDecoder;
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import java.util.List;
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@ChannelHandler.Sharable
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public class VelocityDecodeHandler extends MessageToMessageDecoder<ByteBuf> {
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private final UserConnection info;
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public VelocityDecodeHandler(UserConnection info) {
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this.info = info;
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf bytebuf, List<Object> out) throws Exception {
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if (!info.checkIncomingPacket()) throw CancelDecoderException.generate(null);
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if (!info.shouldTransformPacket()) {
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out.add(bytebuf.retain());
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return;
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}
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ByteBuf transformedBuf = ctx.alloc().buffer().writeBytes(bytebuf);
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try {
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info.transformIncoming(transformedBuf, CancelDecoderException::generate);
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out.add(transformedBuf.retain());
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} finally {
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transformedBuf.release();
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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if (cause instanceof CancelCodecException) return;
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super.exceptionCaught(ctx, cause);
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}
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// Abuse decoder handler to catch events
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@Override
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public void userEventTriggered(ChannelHandlerContext ctx, Object event) throws Exception {
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if (event != VelocityChannelInitializer.COMPRESSION_ENABLED_EVENT) {
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super.userEventTriggered(ctx, event);
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return;
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}
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// When Velocity adds the compression handlers, the order becomes Minecraft Encoder -> Compressor -> Via Encoder
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// Move Via codec handlers back to right position
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ChannelPipeline pipeline = ctx.pipeline();
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ChannelHandler encoder = pipeline.get(VelocityChannelInitializer.VIA_ENCODER);
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pipeline.remove(encoder);
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pipeline.addBefore(VelocityChannelInitializer.MINECRAFT_ENCODER, VelocityChannelInitializer.VIA_ENCODER, encoder);
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ChannelHandler decoder = pipeline.get(VelocityChannelInitializer.VIA_DECODER);
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pipeline.remove(decoder);
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pipeline.addBefore(VelocityChannelInitializer.MINECRAFT_DECODER, VelocityChannelInitializer.VIA_DECODER, decoder);
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super.userEventTriggered(ctx, event);
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}
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}
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