Question about account UUID's

How would I get a player/username based on a UUID?

I know how to get the UUID based on the username, but not the other way around.

Any Ideas?

 

Debels with the player object you can use player.getUniqueId and to go from UUID to name use this library: here

 

AFAIK, bukkit will implement a LastKnownUsername store to go from UUID -> player.
If you cannot wait, you can use https://sessionserver.mojang.com/session/minecraft/profile/{UUID}
However, that is NOT good for bulk data and probably slow (depending on your internet speed).
Be warned, I think mojang might block your IP if you go nuts on the link.

 

Currently it doesn't exist in Bukkit, but internally Bukkit.getServer().getPlayer("name") is just a loop. You can do that yourself.

Code:java

Player getPlayer(UUID pID) {
        for(Player p : Bukkit.getServer().getOnlinePlayers()) {
            if(p.getUniqueId().equals(pID)) {
                return p;
            }
        }
        return null;
    }

 

That only works for online players though.

 

Debels
you can use p.getUniqueId() for mojang UUIDs.
first I thought it whas only the UUID of the world entity but it seems for players its actually the mojang UUID.
now theres only one thing you should know when you go test it that is use online-mode true while debugging else it won't do anything or fails to work.

some interesting classes:
https://github.com/Bukkit/CraftBukk.../java/net/minecraft/server/LoginListener.java keep looking at the GameProfile.

then this one: https://github.com/Bukkit/CraftBukk...in/java/net/minecraft/server/EntityHuman.java
CraftPlayer extends EntityHuman so with other words I'm pretty sure UUID's work through getUniqueId() unless I overlooked something.

I hope it helps a bit

 

EDIT: Mistaken.

 

But getOfflinePlayers would return OfflinePlayers, which don't have getUniqueId...

 

Ah, yeah your right. I didn't notice that. But was he asking for that anyway? He didn't actually ask for offline players in the OP.

 

I don't know, I was just pointing out it wouldn't work.

 

noobkackboon Alshain01
You kind of bumped an old post.

 

Lol, well I didn't. But it's not that old.

 

Alshain01
When it is 1/2 of a month it is old.

 

Well look, if it appears at the top of my list and isn't tagged solved, I'm not going to check every little date code. I'm not the one that dug it out of it's grave.

 

Issues involving UUID are worth keeping open for discussion for the next few months anyway, a storm is coming.

 

the only way or atleast which I would do is creating my own custom instance wrapped around a configuration where the name of that file is actually the UUID, and inside this custom object I will do some checks on the constructor and change the name when necressay.

then I make a Global HashMap such as HashMap<String, CustomObject> where the String the currently player name is and where the CustomObject instance is a wrapped interface, however to get a offline player I do something like this keep in mind what I told above:

Code:

public List<CustomOfflineObject> getOfflinePlayers() {
    File dir = new File(plugin.getDataFolder() + File.Seperator + "players");
    File[] list = dir.listFiles();
    List<CustomOfflineObject> list = new ArrayList<CustomObject>();
      for(File f : list) {
          FileConfiguration con = YamlConfiguration(f);
          CustomOfflineObject offlineplayer = new CustomOfflineObject(con.getString("username"));
          list.add(offlineplayer);
    }
    return list;
}
 
public CustomOfflineObject getOfflinePlayer(String p) {
        for(CustomOfflineObject obj : getOfflinePlayers()) {
                if(obj.getUser().equalsIgnoreCase(p)) {
                    //it equals
                  return obj;
                }
        }
    throw new NullPointerException("no player found by that name");
}

the code is bit messy though however thats the only long work around way how I could verify players, but I also see a long termed problematic effect what if you have around 100 unique players per day?, and then starts to for loop through all thus files I guess this would be shock for the cpu.

I hope my text is clear got to many auto correction errors

edit
I don't like to addvertise my plugin project that much but I'm currently working out the same idea with my privated plugin and it works very good but I'm unsure how it would affect on bigger servers and if size of lines also mathers to.

xEssentialsOfflinePlayer:
https://github.com/xEssentials/xEss...sentials/memory/xEssentialsOfflinePlayer.java

xEssentialsPlayer:
https://github.com/xEssentials/xEss...ebox/essentials/memory/xEssentialsPlayer.java (gets instanced when the player joins, and cleared when they got kicked or quit)

main class where getOfflinePlayer and a bunch of other verify methods are:
https://github.com/xEssentials/xEss...c/tv/mineinthebox/essentials/xEssentials.java