papermc/CraftBukkit-Patches/0102-Use-Offline-Player-Data-Once-if-Required.patch

From 9520fc915bf82a782e7c69c03ee8f8c3b908706e 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/server/WorldNBTStorage.java b/src/main/java/net/minecraft/server/WorldNBTStorage.java
index ae78fa2..bb87701 100644
--- a/src/main/java/net/minecraft/server/WorldNBTStorage.java
+++ b/src/main/java/net/minecraft/server/WorldNBTStorage.java
@@ -200,10 +200,28 @@ public class WorldNBTStorage implements IDataManager, IPlayerFileData {
 
         try {
             File file = new File(this.playerDir, entityhuman.getUniqueID().toString() + ".dat");
+            // Spigot Start
+            boolean usingWrongFile = false;
+            if ( !file.exists() )
+            {
+                file = new File( this.playerDir, UUID.nameUUIDFromBytes( ( "OfflinePlayer:" + entityhuman.getName() ).getBytes( "UTF-8" ) ).toString() + ".dat");
+                if ( file.exists() )
+                {
+                    usingWrongFile = true;
+                    org.bukkit.Bukkit.getServer().getLogger().warning( "Using offline mode UUID file for player " + entityhuman.getName() + " as it is the only copy we can find." );
+                }
+            }
+            // Spigot End
 
             if (file.exists() && file.isFile()) {
                 nbttagcompound = NBTCompressedStreamTools.a((InputStream) (new FileInputStream(file)));
             }
+            // Spigot Start
+            if ( usingWrongFile )
+            {
+                file.renameTo( new File( file.getPath() + ".offline-read" ) );
+            }
+            // Spigot End
         } catch (Exception exception) {
             WorldNBTStorage.a.warn("Failed to load player data for " + entityhuman.getName());
         }
-- 
2.1.0