Paper/Spigot-Server-Patches/0261-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..4fc06bc5ef630b07fc8462cf835e6f92b151e6c6 100644
--- a/src/main/java/net/minecraft/network/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/network/PacketDataSerializer.java
@@ -311,9 +311,18 @@ 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 +342,16 @@ 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..7b47d4f1cbf9f8646e0b1af9277cf341ea28a2b3 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutMapChunk.java
@@ -69,6 +69,7 @@ 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 c525afbc7d73488db2cae1501cdbe80ec05aeb7c..de171e18fbc6cc5ee06e75f4a3c60fd4c710d8bb 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;
+    NBTTagCompound tag; // Paper -> package private
     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 06ab45e0927403beb6b5e11d2b5ea93d4786f1d3..fcc393bcf3e40c347a0320544cc93eb84a4d0b90 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
@@ -153,9 +153,37 @@ 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
+    static NBTTagCompound sanitizeTileEntityUUID(NBTTagCompound cmp) {
+        NBTTagCompound owner = cmp.getCompound("Owner");
+        if (!owner.isEmpty()) {
+            sanitizeUUID(owner);
+        }
+        return cmp;
+    }
+
+    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());