UUIDFetcher v3 Utilizing Mojang's new profiles API.

ProfileFetcher.java

/*
 * Copyright (c) 2015 Nate Mortensen
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * 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 OR COPYRIGHT HOLDERS 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.
 */
package com.evilmidget38;

import com.google.gson.Gson;

import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.*;
import java.util.concurrent.Callable;

public class ProfileFetcher implements Callable<Map<String, ProfileFetcher.GameProfile>>
{
    private static final double PROFILES_PER_REQUEST = 100;
    private static final String PROFILE_URL = "https://api.mojang.com/profiles/minecraft";
    private static final Gson gson = new Gson();
    
    private final List<String> names;
    private final boolean rateLimiting;

    public ProfileFetcher(List<String> names, boolean rateLimiting)
    {
        this.names = Collections.unmodifiableList( names );
        this.rateLimiting = rateLimiting;
    }

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

    @Override
    public Map<String, GameProfile> call() throws Exception
    {
        Map<String, GameProfile> profileMap = new HashMap<>();
        int requests = ( int ) Math.ceil( names.size() / PROFILES_PER_REQUEST );
        for ( int i = 0; i < requests; i++ )
        {
            HttpURLConnection connection = createConnection();
            String body = gson.toJson( names.subList( i * 100, Math.min( ( i + 1 ) * 100, names.size() ) ) );
            writeBody( connection, body );
            GameProfile[] array = gson.fromJson( new InputStreamReader( connection.getInputStream() ), GameProfile[].class );
            for ( GameProfile profile : array )
            {
                profileMap.put( profile.getName(), profile );
                profile.setUuid( getUUID( profile.getId() ) );
            }
            if ( rateLimiting && i != requests - 1 )
            {
                Thread.sleep( 100L );
            }
        }
        return profileMap;
    }

    private static void writeBody(HttpURLConnection connection, String body) throws Exception
    {
        OutputStream stream = connection.getOutputStream();
        stream.write( body.getBytes() );
        stream.flush();
        stream.close();
    }

    private static HttpURLConnection createConnection() throws Exception
    {
        URL url = new URL( PROFILE_URL );
        HttpURLConnection connection = ( HttpURLConnection ) url.openConnection();
        connection.setRequestMethod( "POST" );
        connection.setRequestProperty( "Content-Type", "application/json" );
        connection.setUseCaches( false );
        connection.setDoInput( true );
        connection.setDoOutput( true );
        return connection;
    }
    
    public static byte[] toBytes(UUID uuid) 
    {
        ByteBuffer byteBuffer = ByteBuffer.wrap( new byte[ 16 ] );
        byteBuffer.putLong( uuid.getMostSignificantBits() );
        byteBuffer.putLong( uuid.getLeastSignificantBits() );
        return byteBuffer.array();
    }

    public static UUID fromBytes(byte[] array) 
    {
        if ( array.length != 16 ) 
        {
            throw new IllegalArgumentException( "Illegal byte array length: " + array.length );
        }
        ByteBuffer byteBuffer = ByteBuffer.wrap( array );
        long mostSignificant = byteBuffer.getLong();
        long leastSignificant = byteBuffer.getLong();
        return new UUID( mostSignificant, leastSignificant );
    }

    private 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 static GameProfile getProfileOf(String name) throws Exception
    {
        return new ProfileFetcher( Collections.singletonList( name ) ).call().get( name );
    }

    public class GameProfile
    {
        private UUID uuid;
        private String id;
        private String name;
        boolean legacy;
        boolean demo;

        private void setUuid(UUID uuid)
        {
            this.uuid = uuid;
        }
        
        private String getId()
        {
            return id;
        }

        public UUID getUuid()
        {
            return uuid;
        }

        public String getName()
        {
            return name;
        }

        public boolean isLegacy()
        {
            return legacy;
        }

        public boolean isDemo()
        {
            return demo;
        }
    }
}