fix(temp): pass though custom click action in config state (#1640)

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

@@ -50,6 +50,7 @@ import com.velocitypowered.proxy.protocol.packet.ServerDataPacket;
 import com.velocitypowered.proxy.protocol.packet.ServerLoginPacket;
 import com.velocitypowered.proxy.protocol.packet.ServerLoginSuccessPacket;
 import com.velocitypowered.proxy.protocol.packet.ServerboundCookieResponsePacket;
+import com.velocitypowered.proxy.protocol.packet.ServerboundCustomClickActionPacket;
 import com.velocitypowered.proxy.protocol.packet.SetCompressionPacket;
 import com.velocitypowered.proxy.protocol.packet.StatusPingPacket;
 import com.velocitypowered.proxy.protocol.packet.StatusRequestPacket;
@@ -374,4 +375,9 @@ public interface MinecraftSessionHandler {
   default boolean handle(DialogShowPacket packet) {
     return false;
   }
+
+  default boolean handle(ServerboundCustomClickActionPacket packet) {
+    return false;
+  }
+
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java

@@ -83,6 +83,7 @@ import com.velocitypowered.proxy.protocol.packet.ServerDataPacket;
 import com.velocitypowered.proxy.protocol.packet.ServerLoginPacket;
 import com.velocitypowered.proxy.protocol.packet.ServerLoginSuccessPacket;
 import com.velocitypowered.proxy.protocol.packet.ServerboundCookieResponsePacket;
+import com.velocitypowered.proxy.protocol.packet.ServerboundCustomClickActionPacket;
 import com.velocitypowered.proxy.protocol.packet.SetCompressionPacket;
 import com.velocitypowered.proxy.protocol.packet.StatusPingPacket;
 import com.velocitypowered.proxy.protocol.packet.StatusRequestPacket;
@@ -185,6 +186,8 @@ public enum StateRegistry {
           KnownPacksPacket.class,
           KnownPacksPacket::new,
           map(0x07, MINECRAFT_1_20_5, false));
+      serverbound.register(ServerboundCustomClickActionPacket.class, ServerboundCustomClickActionPacket::new,
+          map(0x08, MINECRAFT_1_21_6, false));
 
       clientbound.register(
           ClientboundCookieRequestPacket.class, ClientboundCookieRequestPacket::new,

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ServerboundCustomClickActionPacket.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018-2025 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.protocol.packet;
+
+import com.velocitypowered.api.network.ProtocolVersion;
+import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
+import com.velocitypowered.proxy.protocol.MinecraftPacket;
+import com.velocitypowered.proxy.protocol.ProtocolUtils;
+import com.velocitypowered.proxy.protocol.util.DeferredByteBufHolder;
+import io.netty.buffer.ByteBuf;
+
+public class ServerboundCustomClickActionPacket extends DeferredByteBufHolder implements MinecraftPacket {
+
+    public ServerboundCustomClickActionPacket() {
+        super(null);
+    }
+
+    @Override
+    public void decode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion version) {
+        replace(buf.readRetainedSlice(buf.readableBytes()));
+    }
+
+    @Override
+    public void encode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion version) {
+        buf.writeBytes(content());
+    }
+
+    @Override
+    public boolean handle(MinecraftSessionHandler handler) {
+        return handler.handle(this);
+    }
+
+}