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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/nbt/CompoundTag.java
+++ b/src/main/java/net/minecraft/nbt/CompoundTag.java
@@ -0,0 +0,0 @@ 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));
     }
 
@@ -0,0 +0,0 @@ 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/world/item/component/ResolvableProfile.java b/src/main/java/net/minecraft/world/item/component/ResolvableProfile.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/item/component/ResolvableProfile.java
+++ b/src/main/java/net/minecraft/world/item/component/ResolvableProfile.java
@@ -0,0 +0,0 @@ public record ResolvableProfile(Optional<String> name, Optional<UUID> id, Proper
         instance -> instance.group(
                     ExtraCodecs.PLAYER_NAME.optionalFieldOf("name").forGetter(ResolvableProfile::name),
                     UUIDUtil.CODEC.optionalFieldOf("id").forGetter(ResolvableProfile::id),
+                    UUIDUtil.STRING_CODEC.lenientOptionalFieldOf("Id").forGetter($ -> Optional.empty()), // Paper
                     ExtraCodecs.PROPERTY_MAP.optionalFieldOf("properties", new PropertyMap()).forGetter(ResolvableProfile::properties)
                 )
-                .apply(instance, ResolvableProfile::new)
+                .apply(instance, (s, uuid, uuid2, propertyMap) -> new ResolvableProfile(s, uuid2.or(() -> uuid), propertyMap)) // Paper
     );
     public static final Codec<ResolvableProfile> CODEC = Codec.withAlternative(
         FULL_CODEC, ExtraCodecs.PLAYER_NAME, name -> new ResolvableProfile(Optional.of(name), Optional.empty(), new PropertyMap())