Initial work for 23w31a

api/src/main/java/com/velocitypowered/api/network/ProtocolVersion.java

@@ -62,7 +62,8 @@ public enum ProtocolVersion {
   MINECRAFT_1_19_1(760, "1.19.1", "1.19.2"),
   MINECRAFT_1_19_3(761, "1.19.3"),
   MINECRAFT_1_19_4(762, "1.19.4"),
-  MINECRAFT_1_20(763, "1.20", "1.20.1");
+  MINECRAFT_1_20(763, "1.20", "1.20.1"),
+  MINECRAFT_1_20_2(-1 /*764*/, 144, "1.20.2");
 
   private static final int SNAPSHOT_BIT = 30;
 

proxy/src/main/java/com/velocitypowered/proxy/connection/MinecraftSessionHandler.java

@@ -31,8 +31,10 @@
 import com.velocitypowered.proxy.protocol.packet.LegacyHandshake;
 import com.velocitypowered.proxy.protocol.packet.LegacyPing;
 import com.velocitypowered.proxy.protocol.packet.LegacyPlayerListItem;
+import com.velocitypowered.proxy.protocol.packet.LoginAcknowledged;
 import com.velocitypowered.proxy.protocol.packet.LoginPluginMessage;
 import com.velocitypowered.proxy.protocol.packet.LoginPluginResponse;
+import com.velocitypowered.proxy.protocol.packet.PingIdentify;
 import com.velocitypowered.proxy.protocol.packet.PluginMessage;
 import com.velocitypowered.proxy.protocol.packet.RemovePlayerInfo;
 import com.velocitypowered.proxy.protocol.packet.ResourcePackRequest;
@@ -55,6 +57,11 @@
 import com.velocitypowered.proxy.protocol.packet.chat.legacy.LegacyChat;
 import com.velocitypowered.proxy.protocol.packet.chat.session.SessionPlayerChat;
 import com.velocitypowered.proxy.protocol.packet.chat.session.SessionPlayerCommand;
+import com.velocitypowered.proxy.protocol.packet.config.ActiveFeatures;
+import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdate;
+import com.velocitypowered.proxy.protocol.packet.config.RegistrySync;
+import com.velocitypowered.proxy.protocol.packet.config.StartUpdate;
+import com.velocitypowered.proxy.protocol.packet.config.TagsUpdate;
 import com.velocitypowered.proxy.protocol.packet.title.LegacyTitlePacket;
 import com.velocitypowered.proxy.protocol.packet.title.TitleActionbarPacket;
 import com.velocitypowered.proxy.protocol.packet.title.TitleClearPacket;
@@ -279,4 +286,32 @@ default boolean handle(RemovePlayerInfo packet) {
   default boolean handle(UpsertPlayerInfo packet) {
     return false;
   }
+
+  default boolean handle(LoginAcknowledged packet) {
+    return false;
+  }
+
+  default boolean handle(ActiveFeatures packet) {
+    return false;
+  }
+
+  default boolean handle(FinishedUpdate packet) {
+    return false;
+  }
+
+  default boolean handle(RegistrySync packet) {
+    return false;
+  }
+
+  default boolean handle(TagsUpdate packet) {
+    return false;
+  }
+
+  default boolean handle(StartUpdate packet) {
+    return false;
+  }
+
+  default boolean handle(PingIdentify pingIdentify) {
+    return false;
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BackendConfigSessionHandler.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2018-2023 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.velocitypowered.proxy.connection.backend;
+
+import com.velocitypowered.api.event.player.ServerLoginPluginMessageEvent;
+import com.velocitypowered.api.network.ProtocolVersion;
+import com.velocitypowered.api.proxy.crypto.IdentifiedKey;
+import com.velocitypowered.api.proxy.messages.MinecraftChannelIdentifier;
+import com.velocitypowered.proxy.VelocityServer;
+import com.velocitypowered.proxy.config.PlayerInfoForwarding;
+import com.velocitypowered.proxy.config.VelocityConfiguration;
+import com.velocitypowered.proxy.connection.MinecraftConnection;
+import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
+import com.velocitypowered.proxy.connection.VelocityConstants;
+import com.velocitypowered.proxy.connection.client.ConnectedPlayer;
+import com.velocitypowered.proxy.connection.util.ConnectionRequestResults;
+import com.velocitypowered.proxy.connection.util.ConnectionRequestResults.Impl;
+import com.velocitypowered.proxy.protocol.ProtocolUtils;
+import com.velocitypowered.proxy.protocol.StateRegistry;
+import com.velocitypowered.proxy.protocol.packet.Disconnect;
+import com.velocitypowered.proxy.protocol.packet.EncryptionRequest;
+import com.velocitypowered.proxy.protocol.packet.LoginPluginMessage;
+import com.velocitypowered.proxy.protocol.packet.LoginPluginResponse;
+import com.velocitypowered.proxy.protocol.packet.ServerLoginSuccess;
+import com.velocitypowered.proxy.protocol.packet.SetCompression;
+import com.velocitypowered.proxy.protocol.packet.config.StartUpdate;
+import com.velocitypowered.proxy.util.except.QuietRuntimeException;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufUtil;
+import io.netty.buffer.Unpooled;
+import net.kyori.adventure.text.Component;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import javax.crypto.Mac;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Handles the initial server configuration setup
+ */
+public class BackendConfigSessionHandler implements MinecraftSessionHandler {
+
+  private static final Logger logger = LogManager.getLogger(BackendConfigSessionHandler.class);
+
+  private final VelocityServer server;
+  private final VelocityServerConnection serverConn;
+  private final CompletableFuture<Impl> resultFuture;
+  private boolean informationForwarded;
+
+  BackendConfigSessionHandler(VelocityServer server, VelocityServerConnection serverConn,
+                              CompletableFuture<Impl> resultFuture) {
+    this.server = server;
+    this.serverConn = serverConn;
+    this.resultFuture = resultFuture;
+  }
+
+
+  @Override
+  public boolean handle(StartUpdate packet) {
+
+    return true;
+  }
+
+}