Hello, I'm making a messenger mod for the client. The person sending/receiving the message are identified by their Mojang UUID. However, I need to find a way to convert the UUID to the person's username to be shown on the GUI. This is client-side, so I'd like to do it without the MinecraftSessionService in the MinecraftServer. I've tried making a query to https://sessionserver.mojang.com/session/minecraft/profile/ and converting it to a GameProfile using Gson. Doesn't work. I've tried using a HttpProfileRepository to get it. It takes to long to respond, usually fails, and is for converting the username to a UUID. It is really important that I do this. It would be easier to use usernames as IDs, but I'd like to be ready for the name changes

 

Here's my user class:

package assets.mcmessenger.client.messenger;

import java.awt.image.BufferedImage;
import java.net.URL;
import java.util.UUID;

import javax.imageio.ImageIO;

import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.texture.DynamicTexture;
import net.minecraft.util.ResourceLocation;
import assets.mcmessenger.client.messenger.util.GameProfileCreator;

import com.mojang.authlib.GameProfile;

public class User {

private static final String faceFetchUrl = "http://cravatar.eu/helmavatar/%s";

private String uuid;
private String name;

private ResourceLocation face;

public User(String uuid) {

	this.uuid = uuid;

	if(this.uuid.equals(Minecraft.getMinecraft().getSession().getUsername())) {

		this.setName(Minecraft.getMinecraft().getSession().getUsername());

	} else {

		try {

			GameProfile profile = GameProfileCreator.createGameProfileFromUUID(uuid);
			setName(profile.getName());

		} catch(Exception e) {

			setName(e.toString());

		}

	}

}

public String getName() {

	return this.name;

}

public void setName(String name) {

	this.name = name;

}

public UUID getUUID() {

	return UUID.fromString(uuid);

}

public ResourceLocation getFace() {

	if(this.face == null) {

		BufferedImage image = null;

		try {

			image = ImageIO.read(new URL(String.format(faceFetchUrl, getName())));

		} catch(Exception e) {

			e.printStackTrace();

		}

		DynamicTexture texture = new DynamicTexture(0, 0);

		if(image != null) {

			texture = new DynamicTexture(image);

		}

		this.face = Minecraft.getMinecraft().getTextureManager().getDynamicTextureLocation("face_" + getName(), texture);

	}

	return this.face;

}

public boolean equals(User user) {

	return user.uuid == this.uuid;

}

}

 

Here's my profile creator:

package assets.mcmessenger.client.messenger.util;

import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.util.UUID;

import org.apache.commons.io.IOUtils;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.stream.JsonReader;
import com.mojang.api.profiles.Profile;
import com.mojang.authlib.GameProfile;

public class GameProfileCreator {

private static final String fetchIdUrl = "https://api.mojang.com/users/profiles/minecraft/%s?at=%s";
private static final String fetchNameUrl = "https://sessionserver.mojang.com/session/minecraft/profile/%s";

public static Profile createGameProfileFromUsername(String username) {

	try {

		Gson gson = new GsonBuilder().setPrettyPrinting().create();
		String url = String.format(fetchIdUrl, username, String.valueOf(System.currentTimeMillis()));
		JsonReader reader = new JsonReader(new InputStreamReader(new URL(url).openStream()));
		reader.setLenient(true);

		return (Profile)gson.fromJson(reader, Profile.class);

	} catch(Exception e) {

		e.printStackTrace();

	}

	Profile profile = new Profile();
	profile.setName(username);
	return profile;

}

public static Profile createGameProfileFromUUID(String uuid) {

	try {

		Gson gson = new GsonBuilder().setPrettyPrinting().create();
		String url = String.format(fetchNameUrl, uuid);
		JsonReader reader = new JsonReader(new InputStreamReader(new URL(url).openStream()));
		reader.setLenient(true);

		return (Profile)gson.fromJson(reader, Profile.class);

	} catch(Exception e) {

		e.printStackTrace();

	}

	Profile profile = new Profile();
	profile.setId(uuid);
	return profile;

}

}

 

If anyone can help, I would be SO grateful! Thank you very much for your time.

- Romejanic

bigteddy98's uuidlib worked pretty well. I used it for a one time, out of game conversion from UUID to name, dunno how fast it would be

it seems to have mostly disappeared, but went like this

 

given uuid as a string, after

 

uuid = uuid.replaceAll("-", ""); // no dashes

 

it went through

	String name = null;
	try {
		URL url = new URL("https://sessionserver.mojang.com/session/minecraft/profile/" + uuid);
		URLConnection connection = url.openConnection();
		Scanner jsonScanner = new Scanner(connection.getInputStream(), "UTF-8");
		String json = jsonScanner.next();
		JSONParser parser = new JSONParser();
		Object obj = parser.parse(json);
		name = (String) ((JSONObject) obj).get("name");
		jsonScanner.close();
	} catch (Exception ex) {
		ex.printStackTrace();
	}

 

there's probably some reason this is horrible code or unworkable or something, but it did what I wanted to for converting a bunch of UUIDs to usernames

bigteddy98's uuidlib worked pretty well. I used it for a one time, out of game conversion from UUID to name, dunno how fast it would be

it seems to have mostly disappeared, but went like this

 

given uuid as a string, after

 

uuid = uuid.replaceAll("-", ""); // no dashes

 

it went through

	String name = null;
	try {
		URL url = new URL("https://sessionserver.mojang.com/session/minecraft/profile/" + uuid);
		URLConnection connection = url.openConnection();
		Scanner jsonScanner = new Scanner(connection.getInputStream(), "UTF-8");
		String json = jsonScanner.next();
		JSONParser parser = new JSONParser();
		Object obj = parser.parse(json);
		name = (String) ((JSONObject) obj).get("name");
		jsonScanner.close();
	} catch (Exception ex) {
		ex.printStackTrace();
	}

 

there's probably some reason this is horrible code or unworkable or something, but it did what I wanted to for converting a bunch of UUIDs to usernames

 

Thanks for your response. The initial method didn't work, so I had to change it to this:

 

public static String getName(String uuid) {

	String name = null;

	try {

		URL url = new URL("https://sessionserver.mojang.com/session/minecraft/profile/" + uuid);
		BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
		StringBuilder sb = new StringBuilder();
		String line;

		while((line = reader.readLine()) != null) {

			sb.append(line + "\n");

		}

		System.out.println(sb.toString());

		JsonParser parser = new JsonParser();
		JsonElement obj = parser.parse(sb.toString().trim());
		name = obj.getAsJsonObject().get("name").getAsString();
		reader.close();

	} catch (Exception ex) {

		ex.printStackTrace();
		name = ex.toString();

	}

	return name;

}

 

It was saying that I couldn't convert the response to a Json object. I put the print in and the string returning from the server was empty. I pasted the URL in Chrome along with a UUID at the end, and nothing happened. The script doesn't return anything. I just need another source to get the json code

 

 

Actually, I misread.  UUID to username, not other way around.

So, use MinecraftServer.getServer().func_152652_a(<uuid>).

If that returns null, use this to request it from the servers.

 

Yeah, but my mod is client-side. I can't use the server. I guess I could make my own instance of the cache, but that might be a little dangerous. I'll try it anyway.

Uhm... why do you need that clientside?! That sounds unusual.

 

I'm making a messaging service, and the message identification is based on UUIDs to support name changes. It has zero involvement with the server, it's all on the client.