109 lines
4.1 KiB
Java
109 lines
4.1 KiB
Java
/*
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* This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
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* Copyright (C) 2016-2024 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.bungee.handlers;
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import com.viaversion.viaversion.api.connection.UserConnection;
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import com.viaversion.viaversion.bungee.util.BungeePipelineUtil;
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import com.viaversion.viaversion.exception.CancelCodecException;
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import com.viaversion.viaversion.exception.CancelEncoderException;
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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.handler.codec.MessageToMessageEncoder;
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import java.util.List;
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@ChannelHandler.Sharable
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public class BungeeEncodeHandler extends MessageToMessageEncoder<ByteBuf> {
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private final UserConnection info;
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private boolean handledCompression;
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public BungeeEncodeHandler(UserConnection info) {
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this.info = info;
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}
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@Override
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protected void encode(final ChannelHandlerContext ctx, ByteBuf bytebuf, List<Object> out) throws Exception {
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if (!ctx.channel().isActive()) {
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throw CancelEncoderException.generate(null);
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}
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if (!info.checkClientboundPacket()) throw CancelEncoderException.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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boolean needsCompress = handleCompressionOrder(ctx, transformedBuf);
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info.transformClientbound(transformedBuf, CancelEncoderException::generate);
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if (needsCompress) {
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recompress(ctx, transformedBuf);
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}
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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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private boolean handleCompressionOrder(ChannelHandlerContext ctx, ByteBuf buf) {
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boolean needsCompress = false;
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if (!handledCompression && ctx.pipeline().names().indexOf("compress") > ctx.pipeline().names().indexOf("via-encoder")) {
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// Need to decompress this packet due to bad order
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ByteBuf decompressed = BungeePipelineUtil.decompress(ctx, buf);
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// Ensure the buffer wasn't reused
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if (buf != decompressed) {
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try {
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buf.clear().writeBytes(decompressed);
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} finally {
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decompressed.release();
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}
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}
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// Reorder the pipeline
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ChannelHandler decoder = ctx.pipeline().get("via-decoder");
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ChannelHandler encoder = ctx.pipeline().get("via-encoder");
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ctx.pipeline().remove(decoder);
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ctx.pipeline().remove(encoder);
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ctx.pipeline().addAfter("decompress", "via-decoder", decoder);
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ctx.pipeline().addAfter("compress", "via-encoder", encoder);
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needsCompress = true;
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handledCompression = true;
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}
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return needsCompress;
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}
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private void recompress(ChannelHandlerContext ctx, ByteBuf buf) {
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ByteBuf compressed = BungeePipelineUtil.compress(ctx, buf);
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try {
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buf.clear().writeBytes(compressed);
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} finally {
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compressed.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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}
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