MC update 1.21

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

@@ -86,7 +86,8 @@ public boolean isSupported() {
   MINECRAFT_1_20(763, "1.20", "1.20.1"),
   MINECRAFT_1_20_2(764, "1.20.2"),
   MINECRAFT_1_20_3(765, "1.20.3", "1.20.4"),
-  MINECRAFT_1_20_5(766, "1.20.5", "1.20.6");
+  MINECRAFT_1_20_5(766, "1.20.5", "1.20.6"),
+  MINECRAFT_1_21(767, "1.21");
 
   private static final int SNAPSHOT_BIT = 30;
 

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

@@ -65,6 +65,8 @@
 import com.velocitypowered.proxy.protocol.packet.chat.session.SessionPlayerChatPacket;
 import com.velocitypowered.proxy.protocol.packet.chat.session.SessionPlayerCommandPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ActiveFeaturesPacket;
+import com.velocitypowered.proxy.protocol.packet.config.ClientboundCustomReportDetailsPacket;
+import com.velocitypowered.proxy.protocol.packet.config.ClientboundServerLinksPacket;
 import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdatePacket;
 import com.velocitypowered.proxy.protocol.packet.config.KnownPacksPacket;
 import com.velocitypowered.proxy.protocol.packet.config.RegistrySyncPacket;
@@ -354,4 +356,12 @@ default boolean handle(ClientboundCookieRequestPacket packet) {
   default boolean handle(ServerboundCookieResponsePacket packet) {
     return false;
   }
+
+  default boolean handle(ClientboundCustomReportDetailsPacket packet) {
+    return false;
+  }
+
+  default boolean handle(ClientboundServerLinksPacket packet) {
+    return false;
+  }
 }

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

@@ -44,6 +44,8 @@
 import com.velocitypowered.proxy.protocol.packet.ResourcePackRequestPacket;
 import com.velocitypowered.proxy.protocol.packet.ResourcePackResponsePacket;
 import com.velocitypowered.proxy.protocol.packet.TransferPacket;
+import com.velocitypowered.proxy.protocol.packet.config.ClientboundCustomReportDetailsPacket;
+import com.velocitypowered.proxy.protocol.packet.config.ClientboundServerLinksPacket;
 import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdatePacket;
 import com.velocitypowered.proxy.protocol.packet.config.RegistrySyncPacket;
 import com.velocitypowered.proxy.protocol.packet.config.StartUpdatePacket;
@@ -116,6 +118,18 @@ public boolean handle(TagsUpdatePacket packet) {
     return true;
   }
 
+  @Override
+  public boolean handle(ClientboundCustomReportDetailsPacket packet) {
+    serverConn.getPlayer().getConnection().write(packet);
+    return true;
+  }
+
+  @Override
+  public boolean handle(ClientboundServerLinksPacket packet) {
+    serverConn.getPlayer().getConnection().write(packet);
+    return true;
+  }
+
   @Override
   public boolean handle(KeepAlivePacket packet) {
     serverConn.ensureConnected().write(packet);

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

@@ -36,6 +36,7 @@
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_3;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_5;
+import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_7_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_8;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_9;
@@ -94,6 +95,8 @@
 import com.velocitypowered.proxy.protocol.packet.chat.session.SessionPlayerCommandPacket;
 import com.velocitypowered.proxy.protocol.packet.chat.session.UnsignedPlayerCommandPacket;
 import com.velocitypowered.proxy.protocol.packet.config.ActiveFeaturesPacket;
+import com.velocitypowered.proxy.protocol.packet.config.ClientboundCustomReportDetailsPacket;
+import com.velocitypowered.proxy.protocol.packet.config.ClientboundServerLinksPacket;
 import com.velocitypowered.proxy.protocol.packet.config.FinishedUpdatePacket;
 import com.velocitypowered.proxy.protocol.packet.config.KnownPacksPacket;
 import com.velocitypowered.proxy.protocol.packet.config.RegistrySyncPacket;
@@ -226,6 +229,10 @@ public enum StateRegistry {
           map(0x0D, MINECRAFT_1_20_5, false));
       clientbound.register(KnownPacksPacket.class, KnownPacksPacket::new,
           map(0x0E, MINECRAFT_1_20_5, false));
+      clientbound.register(ClientboundCustomReportDetailsPacket.class, ClientboundCustomReportDetailsPacket::new,
+          map(0x0F, MINECRAFT_1_21, false));
+      clientbound.register(ClientboundServerLinksPacket.class, ClientboundServerLinksPacket::new,
+          map(0x10, MINECRAFT_1_21, false));
     }
   },
   PLAY {
@@ -659,6 +666,10 @@ public enum StateRegistry {
           TransferPacket::new,
           map(0x73, MINECRAFT_1_20_5, false)
       );
+      clientbound.register(ClientboundCustomReportDetailsPacket.class, ClientboundCustomReportDetailsPacket::new,
+              map(0x7A, MINECRAFT_1_21, false));
+      clientbound.register(ClientboundServerLinksPacket.class, ClientboundServerLinksPacket::new,
+              map(0x7B, MINECRAFT_1_21, false));
     }
   },
   LOGIN {

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

@@ -92,7 +92,7 @@ public void decode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersi
     if (version.noLessThan(ProtocolVersion.MINECRAFT_1_19)) {
       properties = ProtocolUtils.readProperties(buf);
     }
-    if (version == ProtocolVersion.MINECRAFT_1_20_5) {
+    if (version == ProtocolVersion.MINECRAFT_1_20_5 || version == ProtocolVersion.MINECRAFT_1_21) {
       buf.readBoolean();
     }
   }
@@ -123,7 +123,7 @@ public void encode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersi
         ProtocolUtils.writeProperties(buf, properties);
       }
     }
-    if (version == ProtocolVersion.MINECRAFT_1_20_5) {
+    if (version == ProtocolVersion.MINECRAFT_1_20_5 || version == ProtocolVersion.MINECRAFT_1_21) {
       buf.writeBoolean(strictErrorHandling);
     }
   }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/config/ClientboundCustomReportDetailsPacket.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2024 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.config;
+
+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 io.netty.buffer.ByteBuf;
+import java.util.HashMap;
+import java.util.Map;
+
+public class ClientboundCustomReportDetailsPacket implements MinecraftPacket {
+
+    private Map<String, String> details;
+
+    public ClientboundCustomReportDetailsPacket() {
+    }
+
+    public ClientboundCustomReportDetailsPacket(Map<String, String> details) {
+        this.details = details;
+    }
+
+    @Override
+    public void decode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion protocolVersion) {
+        int detailsCount = ProtocolUtils.readVarInt(buf);
+
+        this.details = new HashMap<>(detailsCount);
+        for (int i = 0; i < detailsCount; i++) {
+            details.put(ProtocolUtils.readString(buf), ProtocolUtils.readString(buf));
+        }
+    }
+
+    @Override
+    public void encode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion protocolVersion) {
+        ProtocolUtils.writeVarInt(buf, details.size());
+
+        details.forEach((key, detail) -> {
+            ProtocolUtils.writeString(buf, key);
+            ProtocolUtils.writeString(buf, detail);
+        });
+    }
+
+    @Override
+    public boolean handle(MinecraftSessionHandler handler) {
+        return handler.handle(this);
+    }
+
+    public Map<String, String> getDetails() {
+        return details;
+    }
+}

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/config/ClientboundServerLinksPacket.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2024 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.config;
+
+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.packet.chat.ComponentHolder;
+import io.netty.buffer.ByteBuf;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ClientboundServerLinksPacket implements MinecraftPacket {
+
+    private List<ServerLink> serverLinks;
+
+    public ClientboundServerLinksPacket() {
+    }
+
+    public ClientboundServerLinksPacket(List<ServerLink> serverLinks) {
+        this.serverLinks = serverLinks;
+    }
+
+    @Override
+    public void decode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion version) {
+        int linksCount = ProtocolUtils.readVarInt(buf);
+
+        this.serverLinks = new ArrayList<>(linksCount);
+        for (int i = 0; i < linksCount; i++) {
+            serverLinks.add(ServerLink.read(buf, version));
+        }
+    }
+
+    @Override
+    public void encode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion protocolVersion) {
+        ProtocolUtils.writeVarInt(buf, serverLinks.size());
+
+        for (ServerLink serverLink : serverLinks) {
+            serverLink.write(buf);
+        }
+    }
+
+    @Override
+    public boolean handle(MinecraftSessionHandler handler) {
+        return handler.handle(this);
+    }
+
+    public List<ServerLink> getServerLinks() {
+        return serverLinks;
+    }
+
+    public record ServerLink(int id, ComponentHolder displayName, String url) {
+        private static ServerLink read(ByteBuf buf, ProtocolVersion version) {
+            if (buf.readBoolean()) {
+                return new ServerLink(ProtocolUtils.readVarInt(buf), null, ProtocolUtils.readString(buf));
+            } else {
+                return new ServerLink(-1, ComponentHolder.read(buf, version), ProtocolUtils.readString(buf));
+            }
+        }
+
+        private void write(ByteBuf buf) {
+            if (id >= 0) {
+                buf.writeBoolean(true);
+                ProtocolUtils.writeVarInt(buf, id);
+            } else {
+                buf.writeBoolean(false);
+                displayName.write(buf);
+            }
+            ProtocolUtils.writeString(buf, url);
+        }
+    }
+}