93 lines
4.1 KiB
Java
93 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) 2016-2022 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.providers;
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import com.velocitypowered.api.proxy.ServerConnection;
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import com.viaversion.viaversion.VelocityPlugin;
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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.api.protocol.version.ProtocolVersion;
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import com.viaversion.viaversion.protocols.base.BaseVersionProvider;
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import com.viaversion.viaversion.velocity.platform.VelocityViaInjector;
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import io.netty.channel.ChannelHandler;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.stream.IntStream;
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public class VelocityVersionProvider extends BaseVersionProvider {
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private static Method getAssociation;
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static {
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try {
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getAssociation = Class.forName("com.velocitypowered.proxy.connection.MinecraftConnection").getMethod("getAssociation");
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} catch (NoSuchMethodException | ClassNotFoundException e) {
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e.printStackTrace();
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}
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}
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@Override
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public int getClosestServerProtocol(UserConnection user) throws Exception {
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return user.isClientSide() ? getBackProtocol(user) : getFrontProtocol(user);
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}
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private int getBackProtocol(UserConnection user) throws Exception {
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//TODO use newly added Velocity netty event
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ChannelHandler mcHandler = user.getChannel().pipeline().get("handler");
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return Via.proxyPlatform().protocolDetectorService().serverProtocolVersion(
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((ServerConnection) getAssociation.invoke(mcHandler)).getServerInfo().getName());
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}
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private int getFrontProtocol(UserConnection user) throws Exception {
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int playerVersion = user.getProtocolInfo().getProtocolVersion();
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IntStream versions = com.velocitypowered.api.network.ProtocolVersion.SUPPORTED_VERSIONS.stream()
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.mapToInt(com.velocitypowered.api.network.ProtocolVersion::getProtocol);
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// Modern forwarding mode needs 1.13 Login plugin message
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if (VelocityViaInjector.getPlayerInfoForwardingMode != null
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&& ((Enum<?>) VelocityViaInjector.getPlayerInfoForwardingMode.invoke(VelocityPlugin.PROXY.getConfiguration()))
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.name().equals("MODERN")) {
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versions = versions.filter(ver -> ver >= ProtocolVersion.v1_13.getVersion());
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}
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int[] compatibleProtocols = versions.toArray();
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// Bungee supports it
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if (Arrays.binarySearch(compatibleProtocols, playerVersion) >= 0)
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return playerVersion;
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// Older than bungee supports, get the lowest version
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if (playerVersion < compatibleProtocols[0]) {
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return compatibleProtocols[0];
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}
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// Loop through all protocols to get the closest protocol id that bungee supports (and that viaversion does too)
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// TODO: This needs a better fix, i.e checking ProtocolRegistry to see if it would work.
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// This is more of a workaround for snapshot support by bungee.
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for (int i = compatibleProtocols.length - 1; i >= 0; i--) {
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int protocol = compatibleProtocols[i];
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if (playerVersion > protocol && ProtocolVersion.isRegistered(protocol))
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return protocol;
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}
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Via.getPlatform().getLogger().severe("Panic, no protocol id found for " + playerVersion);
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return playerVersion;
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}
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}
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