RedisBungee/src/main/java/com/imaginarycode/minecraft/redisbungee/util/UUIDFetcher.java

/**
 * This is free and unencumbered software released into the public domain.
 *
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 *
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * For more information, please refer to <http://unlicense.org/>
 */
package com.imaginarycode.minecraft.redisbungee.util;

import com.google.common.collect.ImmutableList;
import com.imaginarycode.minecraft.redisbungee.RedisBungee;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import lombok.Setter;

import java.util.*;
import java.util.concurrent.Callable;

/* Credits to evilmidget38 for this class. I modified it to use Gson. */
public class UUIDFetcher implements Callable<Map<String, UUID>> {
    private static final double PROFILES_PER_REQUEST = 100;
    private static final String PROFILE_URL = "https://api.mojang.com/profiles/minecraft";
    private static final MediaType JSON = MediaType.parse("application/json");
    private final List<String> names;
    private final boolean rateLimiting;

    @Setter
    private static OkHttpClient httpClient;

    public UUIDFetcher(List<String> names, boolean rateLimiting) {
        this.names = ImmutableList.copyOf(names);
        this.rateLimiting = rateLimiting;
    }

    public UUIDFetcher(List<String> names) {
        this(names, true);
    }

    public static UUID getUUID(String id) {
        return UUID.fromString(id.substring(0, 8) + "-" + id.substring(8, 12) + "-" + id.substring(12, 16) + "-" + id.substring(16, 20) + "-" + id.substring(20, 32));
    }

    public Map<String, UUID> call() throws Exception {
        Map<String, UUID> uuidMap = new HashMap<>();
        int requests = (int) Math.ceil(names.size() / PROFILES_PER_REQUEST);
        for (int i = 0; i < requests; i++) {
            String body = RedisBungee.getGson().toJson(names.subList(i * 100, Math.min((i + 1) * 100, names.size())));
            Request request = new Request.Builder().url(PROFILE_URL).post(RequestBody.create(JSON, body)).build();
            String response = httpClient.newCall(request).execute().body().string();
            Profile[] array = RedisBungee.getGson().fromJson(response, Profile[].class);
            for (Profile profile : array) {
                UUID uuid = UUIDFetcher.getUUID(profile.id);
                uuidMap.put(profile.name, uuid);
            }
            if (rateLimiting && i != requests - 1) {
                Thread.sleep(100L);
            }
        }
        return uuidMap;
    }

    private static class Profile {
        String id;
        String name;
    }
}