PaperMC/Unmapped-Spigot-Server-Patches/0260-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/PacketDataSerializer.java b/src/main/java/net/minecraft/network/PacketDataSerializer.java
index df459918c14589155a574730205cb35d463b8079..5a1187b001004afe22d208bc5d7c288e796e16a6 100644
--- a/src/main/java/net/minecraft/network/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/network/PacketDataSerializer.java
@@ -37,6 +37,7 @@ import net.minecraft.network.chat.IChatBaseComponent;
 import net.minecraft.resources.MinecraftKey;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.entity.TileEntitySkull;
 import net.minecraft.world.phys.MovingObjectPositionBlock;
 import net.minecraft.world.phys.Vec3D;
 
@@ -311,9 +312,18 @@ public class PacketDataSerializer extends ByteBuf {
             if (item.usesDurability() || item.n()) {
                 // Spigot start - filter
                 itemstack = itemstack.cloneItemStack();
-                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.hasKeyOfType("SkullOwner", 10)) {
+                    NBTTagCompound owner = nbttagcompound.getCompound("SkullOwner");
+                    if (owner.hasUUID("Id")) {
+                        nbttagcompound.setUUID("SkullOwnerOrig", owner.getUUID("Id"));
+                        TileEntitySkull.sanitizeUUID(owner);
+                    }
+                }
+                // Paper end
             }
 
             this.a(nbttagcompound);
@@ -333,7 +343,16 @@ public class PacketDataSerializer extends ByteBuf {
             itemstack.setTag(this.l());
             // 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.hasKey("SkullOwnerOrig")) {
+                    NBTTagCompound owner = itemstack.tag.getCompound("SkullOwner");
+                    if (itemstack.tag.hasKey("SkullOwnerOrig")) {
+                        owner.map.put("Id", itemstack.tag.map.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/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
index b6b55d5baa5e8a6b69a3e4865c06bc8a4d61a4f3..152118729b1a95dcae05d32aa4289034ba394226 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
@@ -15,6 +15,7 @@ import net.minecraft.network.PacketDataSerializer;
 import net.minecraft.network.protocol.Packet;
 import net.minecraft.world.level.ChunkCoordIntPair;
 import net.minecraft.world.level.block.entity.TileEntity;
+import net.minecraft.world.level.block.entity.TileEntitySkull;
 import net.minecraft.world.level.chunk.BiomeStorage;
 import net.minecraft.world.level.chunk.Chunk;
 import net.minecraft.world.level.chunk.ChunkSection;
@@ -69,6 +70,7 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
 
             if (this.f() || (i & 1 << j) != 0) {
                 NBTTagCompound nbttagcompound = tileentity.b();
+                if (tileentity instanceof TileEntitySkull) { TileEntitySkull.sanitizeTileEntityUUID(nbttagcompound); } // Paper
 
                 this.g.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 2ac8b6ac38bdca26cddfb8652f13b0be0c4000fe..24db5dedf8b41b26fa990a7c7317cdb3e89e7fcd 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -114,7 +114,7 @@ public final class ItemStack {
     private int g;
     @Deprecated
     private Item item;
-    private NBTTagCompound tag;
+    public NBTTagCompound tag; // Paper private -> public
     private boolean j;
     private Entity k;
     private ShapeDetectorBlock l;
diff --git a/src/main/java/net/minecraft/world/level/block/entity/TileEntitySkull.java b/src/main/java/net/minecraft/world/level/block/entity/TileEntitySkull.java
index 22217f24b4a87f10b6d5a3e37d23a1164af84ace..4f7c014fa609a39cac651ccc6d3397d7edb77d8d 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/TileEntitySkull.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/TileEntitySkull.java
@@ -9,6 +9,7 @@ import java.util.UUID;
 import javax.annotation.Nullable;
 import net.minecraft.nbt.GameProfileSerializer;
 import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
 import net.minecraft.network.protocol.game.PacketPlayOutTileEntityData;
 import net.minecraft.server.players.UserCache;
 import net.minecraft.util.UtilColor;
@@ -154,9 +155,37 @@ public class TileEntitySkull extends TileEntity /*implements ITickable*/ { // Pa
     @Nullable
     @Override
     public PacketPlayOutTileEntityData getUpdatePacket() {
-        return new PacketPlayOutTileEntityData(this.position, 4, this.b());
+        return new PacketPlayOutTileEntityData(this.position, 4, sanitizeTileEntityUUID(this.b())); // Paper
     }
 
+    // Paper start
+    public static NBTTagCompound sanitizeTileEntityUUID(NBTTagCompound cmp) {
+        NBTTagCompound owner = cmp.getCompound("Owner");
+        if (!owner.isEmpty()) {
+            sanitizeUUID(owner);
+        }
+        return cmp;
+    }
+
+    public static void sanitizeUUID(NBTTagCompound owner) {
+        NBTTagCompound properties = owner.getCompound("Properties");
+        NBTTagList list = null;
+        if (!properties.isEmpty()) {
+            list = properties.getList("textures", 10);
+        }
+
+        if (list != null && !list.isEmpty()) {
+            String textures = ((NBTTagCompound)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 NBTTagCompound b() {
         return this.save(new NBTTagCompound());