99 lines
4.0 KiB
Java
99 lines
4.0 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.bukkit.handlers;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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import com.viaversion.viaversion.api.Via;
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import com.viaversion.viaversion.api.connection.UserConnection;
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import com.viaversion.viaversion.bukkit.util.NMSUtil;
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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 com.viaversion.viaversion.exception.InformativeException;
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import com.viaversion.viaversion.handlers.ChannelHandlerContextWrapper;
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import com.viaversion.viaversion.handlers.ViaCodecHandler;
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import com.viaversion.viaversion.api.protocol.packet.State;
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import com.viaversion.viaversion.util.PipelineUtil;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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public class BukkitEncodeHandler extends MessageToByteEncoder implements ViaCodecHandler {
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private static Field versionField;
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static {
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try {
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versionField = NMSUtil.nms("PacketEncoder").getDeclaredField("version");
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versionField.setAccessible(true);
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} catch (Exception e) {
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// Not compat version
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}
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}
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private final UserConnection info;
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private final MessageToByteEncoder minecraftEncoder;
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public BukkitEncodeHandler(UserConnection info, MessageToByteEncoder minecraftEncoder) {
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this.info = info;
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this.minecraftEncoder = minecraftEncoder;
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}
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@Override
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protected void encode(final ChannelHandlerContext ctx, Object o, final ByteBuf bytebuf) throws Exception {
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if (versionField != null) {
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versionField.set(minecraftEncoder, versionField.get(this));
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}
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// handle the packet type
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if (!(o instanceof ByteBuf)) {
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// call minecraft encoder
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try {
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PipelineUtil.callEncode(this.minecraftEncoder, new ChannelHandlerContextWrapper(ctx, this), o, bytebuf);
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} catch (InvocationTargetException e) {
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if (e.getCause() instanceof Exception) {
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throw (Exception) e.getCause();
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} else if (e.getCause() instanceof Error) {
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throw (Error) e.getCause();
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}
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}
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} else {
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bytebuf.writeBytes((ByteBuf) o);
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}
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transform(bytebuf);
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}
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@Override
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public void transform(ByteBuf bytebuf) throws Exception {
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if (!info.checkOutgoingPacket()) throw CancelEncoderException.generate(null);
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if (!info.shouldTransformPacket()) return;
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info.transformOutgoing(bytebuf, CancelEncoderException::generate);
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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 (PipelineUtil.containsCause(cause, CancelCodecException.class)) return; // ProtocolLib compat
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super.exceptionCaught(ctx, cause);
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if (!NMSUtil.isDebugPropertySet() && PipelineUtil.containsCause(cause, InformativeException.class)
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&& (info.getProtocolInfo().getState() != State.HANDSHAKE || Via.getManager().isDebug())) {
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cause.printStackTrace(); // Print if CB doesn't already do it
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}
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}
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}
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