PaperMC/patches/server/0397-Support-old-UUID-format-for-NBT.patch

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/nbt/CompoundTag.java b/src/main/java/net/minecraft/nbt/CompoundTag.java
index 2c760084cd1b84a1f2c4f6a6db8d396a1b3c5395..eea9866aecb7189455319d83561fcef35a777d7a 100644
--- a/src/main/java/net/minecraft/nbt/CompoundTag.java
+++ b/src/main/java/net/minecraft/nbt/CompoundTag.java
@@ -237,6 +237,12 @@ public class CompoundTag implements Tag {
     }
 
     public void putUUID(String key, UUID value) {
+        // Paper start - Support old UUID format
+        if (this.contains(key + "Most", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC) && this.contains(key + "Least", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC)) {
+            this.tags.remove(key + "Most");
+            this.tags.remove(key + "Least");
+        }
+        // Paper end - Support old UUID format
         this.tags.put(key, NbtUtils.createUUID(value));
     }
 
@@ -245,10 +251,20 @@ public class CompoundTag implements Tag {
      * You must use {@link #hasUUID(String)} before or else it <b>will</b> throw an NPE.
      */
     public UUID getUUID(String key) {
+        // Paper start - Support old UUID format
+        if (!contains(key, 11) && this.contains(key + "Most", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC) && this.contains(key + "Least", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC)) {
+            return new UUID(this.getLong(key + "Most"), this.getLong(key + "Least"));
+        }
+        // Paper end - Support old UUID format
         return NbtUtils.loadUUID(this.get(key));
     }
 
     public boolean hasUUID(String key) {
+        // Paper start - Support old UUID format
+        if (this.contains(key + "Most", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC) && this.contains(key + "Least", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC)) {
+            return true;
+        }
+        // Paper end - Support old UUID format
         Tag tag = this.get(key);
         return tag != null && tag.getType() == IntArrayTag.TYPE && ((IntArrayTag)tag).getAsIntArray().length == 4;
     }
diff --git a/src/main/java/net/minecraft/nbt/NbtUtils.java b/src/main/java/net/minecraft/nbt/NbtUtils.java
index 4388f2a8b05f5ed2f0934c1693299a4c92072adc..ba0726157417cdde1c9bca93a9e37e68d9b2286d 100644
--- a/src/main/java/net/minecraft/nbt/NbtUtils.java
+++ b/src/main/java/net/minecraft/nbt/NbtUtils.java
@@ -72,6 +72,14 @@ public final class NbtUtils {
     @Nullable
     public static GameProfile readGameProfile(CompoundTag nbt) {
         UUID uUID = nbt.hasUUID("Id") ? nbt.getUUID("Id") : Util.NIL_UUID;
+        // Paper start - Support old UUID format
+        if (nbt.contains("Id", Tag.TAG_STRING)) {
+            try {
+                uUID = UUID.fromString(nbt.getString("Id"));
+            } catch (IllegalArgumentException ignored){
+            }
+        }
+        // Paper end - Support old UUID format
         String string = nbt.getString("Name");
 
         try {