From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 29 Jun 2020 03:26:17 -0400
Subject: [PATCH] Support old UUID format for NBT

We have stored UUID in plenty of places that did not get DFU'd

So just look for old format and load it if it exists.

diff --git a/src/main/java/net/minecraft/server/GameProfileSerializer.java b/src/main/java/net/minecraft/server/GameProfileSerializer.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/GameProfileSerializer.java
+++ b/src/main/java/net/minecraft/server/GameProfileSerializer.java
@@ -0,0 +0,0 @@ public final class GameProfileSerializer {
             s = nbttagcompound.getString("Name");
         }
 
+        // Paper start - support string UUID's
+        if (nbttagcompound.hasKeyOfType("Id", 8)) {
+            uuid = UUID.fromString(nbttagcompound.getString("Id"));
+        }
+        // Paper end
         if (nbttagcompound.b("Id")) {
             uuid = nbttagcompound.a("Id");
         }
diff --git a/src/main/java/net/minecraft/server/NBTTagCompound.java b/src/main/java/net/minecraft/server/NBTTagCompound.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/NBTTagCompound.java
+++ b/src/main/java/net/minecraft/server/NBTTagCompound.java
@@ -0,0 +0,0 @@ public class NBTTagCompound implements NBTBase {
 
     public void setUUID(String prefix, UUID uuid) { a(prefix, uuid); } // Paper - OBFHELPER
     public void a(String s, UUID uuid) {
+        // Paper start - support old format
+        if (this.hasKeyOfType(s + "Most", 99) && this.hasKeyOfType(s + "Least", 99)) {
+            this.map.remove(s + "Most");
+            this.map.remove(s + "Least");
+        }
+        // Paper end
         this.map.put(s, GameProfileSerializer.a(uuid));
     }
 
@@ -0,0 +0,0 @@ public class NBTTagCompound implements NBTBase {
     @Nullable public UUID getUUID(String prefix) { return a(prefix); } // Paper - OBFHELPER
     @Nullable
     public UUID a(String s) {
+        // Paper start - support old format
+        if (!hasKeyOfType(s, 11) && this.hasKeyOfType(s + "Most", 99) && this.hasKeyOfType(s + "Least", 99)) {
+            return new UUID(this.getLong(s + "Most"), this.getLong(s + "Least"));
+        }
+        // Paper end
         return GameProfileSerializer.a(this.get(s));
     }
 
     public final boolean hasUUID(String s) { return this.b(s); } // Paper - OBFHELPER
     public boolean b(String s) {
+        // Paper start - support old format
+        if (this.hasKeyOfType(s + "Most", 99) && this.hasKeyOfType(s + "Least", 99)) {
+            return true;
+        }
+        // Paper end
         NBTBase nbtbase = this.get(s);
 
         return nbtbase != null && nbtbase.b() == NBTTagIntArray.a && ((NBTTagIntArray) nbtbase).getInts().length == 4;
