1.19.1-pre2 (at least an initial pass)

build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
 
 allprojects {
     group = "com.viaversion"
-    version = "4.3.1-1.19.1-pre1-SNAPSHOT"
+    version = "4.3.1-1.19.1-pre2-SNAPSHOT"
     description = "Allow older clients to join newer server versions."
 }
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_18_2to1_19/Protocol1_18_2To1_19.java

@@ -269,7 +269,7 @@ public final class Protocol1_18_2To1_19 extends BackwardsProtocol<ClientboundPac
             @Override
             public void registerMap() {
                 map(Type.STRING); // Name
-                create(Type.BOOLEAN, false); // No public key - requiring this has to be disabled on the server
+                create(Type.OPTIONAL_PROFILE_KEY, null); // No public key - requiring this has to be disabled on the server
             }
         });
 

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19to1_19_1/Protocol1_19To1_19_1.java

@@ -20,7 +20,11 @@ package com.viaversion.viabackwards.protocol.protocol1_19to1_19_1;
 import com.viaversion.viabackwards.api.BackwardsProtocol;
 import com.viaversion.viabackwards.protocol.protocol1_19to1_19_1.packets.EntityPackets1_19_1;
 import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.State;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.protocols.base.ServerboundLoginPackets;
 import com.viaversion.viaversion.protocols.protocol1_19to1_18_2.ClientboundPackets1_19;
 import com.viaversion.viaversion.protocols.protocol1_19to1_18_2.ServerboundPackets1_19;
 
@@ -31,6 +35,33 @@ public final class Protocol1_19To1_19_1 extends BackwardsProtocol<ClientboundPac
     @Override
     protected void registerPackets() {
         entityRewriter.register();
+
+        // Skip 1.19 and assume 1.19.1->1.18.2 translation
+        registerClientbound(ClientboundPackets1_19.SYSTEM_CHAT, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.COMPONENT);
+                handler(wrapper -> {
+                    if (wrapper.read(Type.BOOLEAN)) {
+                        wrapper.cancel();
+                        return;
+                    }
+
+                    wrapper.write(Type.VAR_INT, 0); // TODO
+                });
+            }
+        });
+
+        registerServerbound(State.LOGIN, ServerboundLoginPackets.HELLO.getId(), ServerboundLoginPackets.HELLO.getId(), new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING); // Name
+                // Write empty profile key and uuid
+                read(Type.OPTIONAL_PROFILE_KEY);
+                create(Type.OPTIONAL_PROFILE_KEY, null);
+                create(Type.OPTIONAL_UUID, null);
+            }
+        });
     }
 
     @Override

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ metadata.format.version = "1.1"
 [versions]
 
 # ViaVersion
-viaver = "4.3.2-1.19.1-pre1-SNAPSHOT"
+viaver = "4.3.2-1.19.1-pre2-SNAPSHOT"
 
 # Common provided
 netty = "4.0.20.Final"