Paper/patches/server-remapped/0262-Fix-client-rendering-skulls-from-same-user.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 22 Nov 2016 00:40:42 -0500
Subject: [PATCH] Fix client rendering skulls from same user

See: https://github.com/PaperMC/Paper/issues/1304

Changes the UUID sent to client to be based on either
the texture payload, or random.

This allows the client to render multiple skull textures from the same user,
for when different skins were used when skull was made.

diff --git a/src/main/java/net/minecraft/network/FriendlyByteBuf.java b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
index b4542ce6a8c37ab31e6ecaeb4cbad4742cca0f9b..10f1e3d761af83507bf71a00092641e22d0c8049 100644
--- a/src/main/java/net/minecraft/network/FriendlyByteBuf.java
+++ b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
@@ -37,6 +37,7 @@ import net.minecraft.network.chat.Component;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.entity.SkullBlockEntity;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.Vec3;
 import org.bukkit.craftbukkit.inventory.CraftItemStack; // CraftBukkit
@@ -310,9 +311,18 @@ public class FriendlyByteBuf extends ByteBuf {
             if (item.canBeDepleted() || item.shouldOverrideMultiplayerNbt()) {
                 // Spigot start - filter
                 itemstack = itemstack.copy();
-                CraftItemStack.setItemMeta(itemstack, CraftItemStack.getItemMeta(itemstack));
+                //CraftItemStack.setItemMeta(itemstack, CraftItemStack.getItemMeta(itemstack)); // Paper - This is no longer needed due to NBT being supported
                 // Spigot end
                 nbttagcompound = itemstack.getTag();
+                // Paper start
+                if (nbttagcompound != null && nbttagcompound.contains("SkullOwner", 10)) {
+                    CompoundTag owner = nbttagcompound.getCompound("SkullOwner");
+                    if (owner.hasUUID("Id")) {
+                        nbttagcompound.setUUID("SkullOwnerOrig", owner.getUUID("Id"));
+                        SkullBlockEntity.sanitizeUUID(owner);
+                    }
+                }
+                // Paper end
             }
 
             this.writeNbt(nbttagcompound);
@@ -332,7 +342,16 @@ public class FriendlyByteBuf extends ByteBuf {
             itemstack.setTag(this.readNbt());
             // CraftBukkit start
             if (itemstack.getTag() != null) {
-                CraftItemStack.setItemMeta(itemstack, CraftItemStack.getItemMeta(itemstack));
+                // Paper start - Fix skulls of same owner - restore orig ID since we changed it on send to client
+                if (itemstack.tag.contains("SkullOwnerOrig")) {
+                    CompoundTag owner = itemstack.tag.getCompound("SkullOwner");
+                    if (itemstack.tag.contains("SkullOwnerOrig")) {
+                        owner.tags.put("Id", itemstack.tag.tags.get("SkullOwnerOrig"));
+                        itemstack.tag.remove("SkullOwnerOrig");
+                    }
+                }
+                // Paper end
+                // CraftItemStack.setItemMeta(itemstack, CraftItemStack.getItemMeta(itemstack)); // Paper - This is no longer needed due to NBT being supported
             }
             // CraftBukkit end
             return itemstack;
diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacket.java
index e5d4363edb8c494d2db69d2e0223a2db1519f64b..4fe15aa331ca18319ca46d1b426f0d6fd24341f0 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacket.java
@@ -15,6 +15,7 @@ import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.network.protocol.Packet;
 import net.minecraft.world.level.ChunkPos;
 import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.entity.SkullBlockEntity;
 import net.minecraft.world.level.chunk.ChunkBiomeContainer;
 import net.minecraft.world.level.chunk.LevelChunk;
 import net.minecraft.world.level.chunk.LevelChunkSection;
@@ -69,6 +70,7 @@ public class ClientboundLevelChunkPacket implements Packet<ClientGamePacketListe
 
             if (this.isFullChunk() || (includedSectionsMask & 1 << j) != 0) {
                 CompoundTag nbttagcompound = tileentity.getUpdateTag();
+                if (tileentity instanceof SkullBlockEntity) { SkullBlockEntity.sanitizeTileEntityUUID(nbttagcompound); } // Paper
 
                 this.blockEntitiesTags.add(nbttagcompound);
             }
diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index 34187197efd5ceff0503682dc6ce313220ca916f..79a7c37f15840dbd97510874ac12437d2b854999 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -112,7 +112,7 @@ public final class ItemStack {
     private int popTime;
     @Deprecated
     private Item item;
-    private CompoundTag tag;
+    public CompoundTag tag; // Paper private -> public
     private boolean emptyCacheFlag;
     private Entity entityRepresentation;
     private BlockInWorld cachedBreakBlock;
diff --git a/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
index eebaeaccc3ba1a9ec089d84b8de6c9d36034868f..6a1289424421083876d1808b7328cd3f01063a7e 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
@@ -25,6 +25,7 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
 import net.minecraft.nbt.NbtUtils;
 import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
 import net.minecraft.server.MinecraftServer;
@@ -152,9 +153,37 @@ public class SkullBlockEntity extends BlockEntity /*implements ITickable*/ { //
     @Nullable
     @Override
     public ClientboundBlockEntityDataPacket getUpdatePacket() {
-        return new ClientboundBlockEntityDataPacket(this.worldPosition, 4, this.getUpdateTag());
+        return new ClientboundBlockEntityDataPacket(this.worldPosition, 4, sanitizeTileEntityUUID(this.getUpdateTag())); // Paper
     }
 
+    // Paper start
+    public static CompoundTag sanitizeTileEntityUUID(CompoundTag cmp) {
+        CompoundTag owner = cmp.getCompound("Owner");
+        if (!owner.isEmpty()) {
+            sanitizeUUID(owner);
+        }
+        return cmp;
+    }
+
+    public static void sanitizeUUID(CompoundTag owner) {
+        CompoundTag properties = owner.getCompound("Properties");
+        ListTag list = null;
+        if (!properties.isEmpty()) {
+            list = properties.getList("textures", 10);
+        }
+
+        if (list != null && !list.isEmpty()) {
+            String textures = ((CompoundTag)list.get(0)).getString("Value");
+            if (textures != null && textures.length() > 3) {
+                UUID uuid = UUID.nameUUIDFromBytes(textures.getBytes());
+                owner.setUUID("Id", uuid);
+                return;
+            }
+        }
+        owner.setUUID("Id", UUID.randomUUID());
+    }
+    // Paper end
+
     @Override
     public CompoundTag getUpdateTag() {
         return this.save(new CompoundTag());