spigot/CraftBukkit-Patches/0043-Use-Offline-Player-Data-Once-if-Required.patch

From 1b16ac6bbd18d8193a16efbdf9bf3023afd3bd05 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Sun, 13 Apr 2014 14:41:23 +1000
Subject: [PATCH] Use Offline Player Data Once if Required.

If we are online mode and the only copy of player data we can find is the player's offline mode data, we will attempt a once off conversion by reading this data and then renaming the file so it won't be used again.

diff --git a/src/main/java/net/minecraft/world/level/storage/WorldNBTStorage.java b/src/main/java/net/minecraft/world/level/storage/WorldNBTStorage.java
index 689d28b5b9..d77142665d 100644
--- a/src/main/java/net/minecraft/world/level/storage/WorldNBTStorage.java
+++ b/src/main/java/net/minecraft/world/level/storage/WorldNBTStorage.java
@@ -57,10 +57,28 @@ public class WorldNBTStorage {
 
         try {
             File file = new File(this.playerDir, entityhuman.getStringUUID() + ".dat");
+            // Spigot Start
+            boolean usingWrongFile = false;
+            if ( !file.exists() )
+            {
+                file = new File( this.playerDir, java.util.UUID.nameUUIDFromBytes( ( "OfflinePlayer:" + entityhuman.getScoreboardName() ).getBytes( "UTF-8" ) ).toString() + ".dat");
+                if ( file.exists() )
+                {
+                    usingWrongFile = true;
+                    org.bukkit.Bukkit.getServer().getLogger().warning( "Using offline mode UUID file for player " + entityhuman.getScoreboardName() + " as it is the only copy we can find." );
+                }
+            }
+            // Spigot End
 
             if (file.exists() && file.isFile()) {
                 nbttagcompound = NBTCompressedStreamTools.readCompressed(file.toPath(), NBTReadLimiter.unlimitedHeap());
             }
+            // Spigot Start
+            if ( usingWrongFile )
+            {
+                file.renameTo( new File( file.getPath() + ".offline-read" ) );
+            }
+            // Spigot End
         } catch (Exception exception) {
             WorldNBTStorage.LOGGER.warn("Failed to load player data for {}", entityhuman.getName().getString());
         }
-- 
2.43.0