Convert components in sign block entities in 1.12->1.11 (#845)

Author: FlorianMichael

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/rewriter/BlockItemPacketRewriter1_12.java

@@ -18,6 +18,7 @@
 
 package com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter;
 
+import com.viaversion.nbt.tag.StringTag;
 import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
 import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
 import com.viaversion.viabackwards.protocol.v1_12to1_11_1.data.MapColorMappings1_11_1;
@@ -38,6 +39,9 @@
 import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
 import java.util.Iterator;
 import java.util.Map;
+import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.Key;
+import com.viaversion.viaversion.util.SerializerVersion;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class BlockItemPacketRewriter1_12 extends LegacyBlockItemRewriter<ClientboundPackets1_12, ServerboundPackets1_9_3, Protocol1_12To1_11_1> {
@@ -133,6 +137,15 @@ public void register() {
             Chunk chunk = wrapper.passthrough(type);
 
             handleChunk(chunk);
+            for (final CompoundTag tag : chunk.getBlockEntities()) {
+                final String id = tag.getString("id");
+                if (id == null) {
+                    continue;
+                }
+                if (Key.stripMinecraftNamespace(id).equals("sign")) {
+                    handleSignText(tag);
+                }
+            }
         });
 
         protocol.registerClientbound(ClientboundPackets1_12.BLOCK_ENTITY_DATA, new PacketHandlers() {
@@ -143,9 +156,14 @@ public void register() {
                 map(Types.NAMED_COMPOUND_TAG); // 2 - NBT
 
                 handler(wrapper -> {
-                    // Remove bed color
-                    if (wrapper.get(Types.UNSIGNED_BYTE, 0) == 11)
+                    final short type = wrapper.get(Types.UNSIGNED_BYTE, 0);
+                    if (type == 9) {
+                        final CompoundTag tag = wrapper.get(Types.NAMED_COMPOUND_TAG, 0);
+                        handleSignText(tag);
+                    } else if (type == 11) {
+                        // Remove bed color
                         wrapper.cancel();
+                    }
                 });
             }
         });
@@ -170,6 +188,18 @@ public void register() {
         });
     }
 
+    private void handleSignText(final CompoundTag tag) {
+        // Push signs through component conversion, fixes https://github.com/ViaVersion/ViaBackwards/issues/835
+        for (int i = 0; i < 4; i++) {
+            final StringTag lineTag = tag.getStringTag("Text" + (i + 1));
+            if (lineTag == null) {
+                continue;
+            }
+
+            lineTag.setValue(ComponentUtil.convertJsonOrEmpty(lineTag.getValue(), SerializerVersion.V1_12, SerializerVersion.V1_9).toString());
+        }
+    }
+
     @Override
     public @Nullable Item handleItemToClient(UserConnection connection, Item item) {
         if (item == null) return null;

common/src/main/java/com/viaversion/viabackwards/protocol/v1_9_3to1_9_1/Protocol1_9_3To1_9_1.java

@@ -24,7 +24,6 @@
 import com.viaversion.viaversion.api.minecraft.ClientWorld;
 import com.viaversion.viaversion.api.minecraft.BlockPosition;
 import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
-import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_9_1;
@@ -60,9 +59,9 @@ public void register() {
 
                         wrapper.setPacketType(ClientboundPackets1_9.UPDATE_SIGN);
                         wrapper.write(Types.BLOCK_POSITION1_8, position); // Position
-                        for (int i = 1; i < 5; i++) {
+                        for (int i = 0; i < 4; i++) {
                             // Should technically be written as COMPONENT, but left as String for simplification/to remove redundant wrapping for VR
-                            StringTag textTag = tag.getStringTag("Text" + i);
+                            StringTag textTag = tag.getStringTag("Text" + (i + 1));
                             String line = textTag != null ? textTag.getValue() : "";
                             wrapper.write(Types.STRING, line); // Sign line
                         }
@@ -122,4 +121,4 @@ public void init(UserConnection userConnection) {
             userConnection.put(new ClientWorld());
         }
     }
-}
+}