Core/src/main/java/eu/univento/core/api/utils/UUIDFetcher.java

/*
 *  Copyright (c) 2017 univento.eu - All rights reserved
 * You are not allowed to use, distribute or modify this code
 */

package eu.univento.core.api.utils;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.mojang.util.UUIDTypeAdapter;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.function.Consumer;

/**
 * @author Jofkos
 * @version 1.0
 */

public class UUIDFetcher{

    /**
     * Date when name changes were introduced
     * @see UUIDFetcher#getUUIDAt(String, long)
     */
    public static final long FEBRUARY_2015 = 1422748800000L;


    private static final Gson gson = new GsonBuilder().registerTypeAdapter(UUID.class, new UUIDTypeAdapter()).create();

    //private static final String UUID_URL = "https://api.mojang.com/users/profiles/minecraft/%s?at=%d";
    private static final String UUID_URL = "https://mcapi.de/api/user/%s";
    private static final String NAME_URL = "https://api.mojang.com/user/profiles/%s/names";
    private static final Map<String, UUID> uuidCache = new HashMap<>();
    private static final Map<UUID, String> nameCache = new HashMap<>();
    private static final ExecutorService pool = Executors.newCachedThreadPool();

    private String name;
    private UUID id;

    /**
     * Fetches the uuid asynchronously and passes it to the consumer
     *
     * @param name The name
     * @param action Do what you want to do with the uuid her
     */
    public static void getUUID(String name, Consumer<UUID> action) {
        pool.execute(() -> action.accept(getUUID(name)));
    }

    /**
     * Fetches the uuid synchronously and returns it
     *
     * @param name The name
     * @return The uuid
     */
    public static UUID getUUID(String name) {
        return getUUIDAt(name, System.currentTimeMillis());
    }

    /**
     * Fetches the uuid synchronously for a specified name and time and passes the result to the consumer
     *
     * @param name The name
     * @param timestamp Time when the player had this name in milliseconds
     * @param action Do what you want to do with the uuid her
     */
    public static void getUUIDAt(String name, long timestamp, Consumer<UUID> action) {
        pool.execute(() -> action.accept(getUUIDAt(name, timestamp)));
    }

    /**
     * Fetches the uuid synchronously for a specified name and time
     *
     * @param name The name
     * @param timestamp Time when the player had this name in milliseconds
     * @see UUIDFetcher#FEBRUARY_2015
     */
    private static UUID getUUIDAt(String name, long timestamp) {
        name = name.toLowerCase();
        if (uuidCache.containsKey(name)) {
            return uuidCache.get(name);
        }
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(String.format(UUID_URL, name, timestamp/1000)).openConnection();
            connection.setReadTimeout(5000);
            UUIDFetcher data = gson.fromJson(new BufferedReader(new InputStreamReader(connection.getInputStream())), UUIDFetcher.class);

            uuidCache.put(name, data.id);
            nameCache.put(data.id, data.name);
            return data.id;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    /**
     * Fetches the name asynchronously and passes it to the consumer
     *
     * @param uuid The uuid
     * @param action Do what you want to do with the name her
     */
    public static void getName(UUID uuid, Consumer<String> action) {
        pool.execute(() -> action.accept(getName(uuid)));
    }
    /**
     * Fetches the name synchronously and returns it
     *
     * @param uuid The uuid
     * @return The name
     */
    public static String getName(UUID uuid) {
        if (nameCache.containsKey(uuid)) {
            return nameCache.get(uuid);
        }
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(String.format(NAME_URL, UUIDTypeAdapter.fromUUID(uuid))).openConnection();
            connection.setReadTimeout(5000);
            UUIDFetcher[] nameHistory = gson.fromJson(new BufferedReader(new InputStreamReader(connection.getInputStream())), UUIDFetcher[].class);
            UUIDFetcher currentNameData = nameHistory[nameHistory.length - 1];
            uuidCache.put(currentNameData.name.toLowerCase(), uuid);
            nameCache.put(uuid, currentNameData.name);
            return currentNameData.name;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}