testserver/CraftBukkit-Patches/0128-1.7.6-pre1-support.patch

From eb1f5710238f46dedec083d03215a0d48d4f946c Mon Sep 17 00:00:00 2001
From: Thinkofdeath <thethinkofdeath@gmail.com>
Date: Thu, 3 Apr 2014 17:04:18 +0100
Subject: [PATCH] 1.7.6-pre1 support


diff --git a/pom.xml b/pom.xml
index c8285e0..24d101c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,6 +31,10 @@
       <id>repobo-snap</id>
       <url>http://repo.bukkit.org/content/groups/public</url>
     </repository>
+    <repository>
+      <id>vanilla</id>
+      <url>https://libraries.minecraft.net/</url>
+    </repository>
   </repositories>
 
   <pluginRepositories>
@@ -114,6 +118,21 @@
       <artifactId>trove4j</artifactId>
       <version>3.0.3</version>
     </dependency>
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-lang3</artifactId>
+      <version>3.2.1</version>
+    </dependency>
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+      <version>2.4</version>
+    </dependency>
+    <dependency>
+      <groupId>commons-codec</groupId>
+      <artifactId>commons-codec</artifactId>
+      <version>1.6</version>
+    </dependency>
   </dependencies>
 
   <!-- This builds a completely 'ready to start' jar with all dependencies inside -->
diff --git a/src/main/java/net/minecraft/server/HandshakeListener.java b/src/main/java/net/minecraft/server/HandshakeListener.java
index 42539b4..490123f 100644
--- a/src/main/java/net/minecraft/server/HandshakeListener.java
+++ b/src/main/java/net/minecraft/server/HandshakeListener.java
@@ -1,5 +1,6 @@
 package net.minecraft.server;
 
+import net.minecraft.util.io.netty.util.AttributeKey;
 import net.minecraft.util.io.netty.util.concurrent.GenericFutureListener;
 
 // CraftBukkit start
@@ -13,6 +14,7 @@ public class HandshakeListener implements PacketHandshakingInListener {
     private static final HashMap<InetAddress, Long> throttleTracker = new HashMap<InetAddress, Long>();
     private static int throttleCounter = 0;
     // CraftBukkit end
+    public static final AttributeKey<Integer> protocolVersion = new AttributeKey<Integer>( "protocolVersion" ); // Spigot
 
     private final MinecraftServer a;
     private final NetworkManager b;
@@ -23,6 +25,12 @@ public class HandshakeListener implements PacketHandshakingInListener {
     }
 
     public void a(PacketHandshakingInSetProtocol packethandshakinginsetprotocol) {
+        // Spigot start
+        b.m.attr( protocolVersion ).set( 4 );
+        if (packethandshakinginsetprotocol.d() == 5) {
+            b.m.attr( protocolVersion ).set( 5 );
+        }
+        // Spigot end
         switch (ProtocolOrdinalWrapper.a[packethandshakinginsetprotocol.c().ordinal()]) {
         case 1:
             this.b.a(EnumProtocol.LOGIN);
@@ -62,8 +70,7 @@ public class HandshakeListener implements PacketHandshakingInListener {
                 org.apache.logging.log4j.LogManager.getLogger().debug("Failed to check connection throttle", t);
             }
             // CraftBukkit end
-
-            if (packethandshakinginsetprotocol.d() > 4) {
+            if (packethandshakinginsetprotocol.d() > 5) { // Spigot
                 chatcomponenttext = new ChatComponentText( org.spigotmc.SpigotConfig.outdatedServerMessage ); // Spigot
                 this.b.handle(new PacketLoginOutDisconnect(chatcomponenttext), new GenericFutureListener[0]);
                 this.b.close(chatcomponenttext);
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 8ce9dd7..96b904c 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -10,13 +10,13 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Date;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Random;
 import java.util.UUID;
 import java.util.concurrent.Callable;
 import javax.imageio.ImageIO;
 
+import org.spigotmc.authlib.yggdrasil.YggdrasilMinecraftSessionService;
 import net.minecraft.util.com.google.common.base.Charsets;
 import net.minecraft.util.com.mojang.authlib.GameProfile;
 import net.minecraft.util.com.mojang.authlib.minecraft.MinecraftSessionService;
@@ -107,6 +107,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IMo
     private static final int TICK_TIME = 1000000000 / TPS;
     private static final int SAMPLE_INTERVAL = 100;
     public final double[] recentTps = new double[ 3 ];
+    public final org.spigotmc.authlib.minecraft.MinecraftSessionService newSessionService;
     // Spigot end
 
     public MinecraftServer(OptionSet options, Proxy proxy) { // CraftBukkit - signature file -> OptionSet
@@ -117,6 +118,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IMo
         this.n = new CommandDispatcher();
         // this.convertable = new WorldLoaderServer(file1); // CraftBukkit - moved to DedicatedServer.init
         this.S = (new YggdrasilAuthenticationService(proxy, UUID.randomUUID().toString())).createMinecraftSessionService();
+        newSessionService = new org.spigotmc.authlib.yggdrasil.YggdrasilAuthenticationService(proxy, UUID.randomUUID().toString()).createMinecraftSessionService();
 
         // CraftBukkit start
         this.options = options;
diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
index f6cca80..56bfe34 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -35,7 +35,7 @@ public class NetworkManager extends SimpleChannelInboundHandler {
     private final boolean j;
     private final Queue k = Queues.newConcurrentLinkedQueue();
     private final Queue l = Queues.newConcurrentLinkedQueue();
-    private Channel m;
+    public Channel m; // Spigot
     public SocketAddress n; // Spigot
     public String spoofedUUID; // Spigot
     private PacketListener o;
diff --git a/src/main/java/net/minecraft/server/Packet.java b/src/main/java/net/minecraft/server/Packet.java
index 592ffc5..190da32 100644
--- a/src/main/java/net/minecraft/server/Packet.java
+++ b/src/main/java/net/minecraft/server/Packet.java
@@ -47,6 +47,12 @@ public abstract class Packet {
 
     public abstract void b(PacketDataSerializer packetdataserializer) throws IOException; // CraftBukkit - added throws
 
+    // Spigot start
+    public void writeSnapshot(PacketDataSerializer packetDataSerializer) throws IOException {
+        b( packetDataSerializer );
+    }
+    // Spigot end
+
     public abstract void handle(PacketListener packetlistener);
 
     public boolean a() {
diff --git a/src/main/java/net/minecraft/server/PacketEncoder.java b/src/main/java/net/minecraft/server/PacketEncoder.java
new file mode 100644
index 0000000..ab00152
--- /dev/null
+++ b/src/main/java/net/minecraft/server/PacketEncoder.java
@@ -0,0 +1,52 @@
+package net.minecraft.server;
+
+import java.io.IOException;
+
+import net.minecraft.util.com.google.common.collect.BiMap;
+import net.minecraft.util.io.netty.buffer.ByteBuf;
+import net.minecraft.util.io.netty.channel.ChannelHandlerContext;
+import net.minecraft.util.io.netty.handler.codec.MessageToByteEncoder;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.Marker;
+import org.apache.logging.log4j.MarkerManager;
+
+public class PacketEncoder extends MessageToByteEncoder {
+
+    private static final Logger a = LogManager.getLogger();
+    private static final Marker b = MarkerManager.getMarker("PACKET_SENT", NetworkManager.b);
+    private final NetworkStatistics c;
+
+    public PacketEncoder(NetworkStatistics networkstatistics) {
+        this.c = networkstatistics;
+    }
+
+    protected void a(ChannelHandlerContext channelhandlercontext, Packet packet, ByteBuf bytebuf) throws IOException
+    {
+        Integer integer = (Integer) ((BiMap) channelhandlercontext.channel().attr(NetworkManager.f).get()).inverse().get(packet.getClass());
+
+        if (a.isDebugEnabled()) {
+            a.debug(b, "OUT: [{}:{}] {}[{}]", new Object[] { channelhandlercontext.channel().attr(NetworkManager.d).get(), integer, packet.getClass().getName(), packet.b()});
+        }
+
+        if (integer == null) {
+            throw new IOException("Can\'t serialize unregistered packet");
+        } else {
+            PacketDataSerializer packetdataserializer = new PacketDataSerializer(bytebuf);
+
+            packetdataserializer.b(integer.intValue());
+            if ( channelhandlercontext.channel().attr( HandshakeListener.protocolVersion ).get() == 4)
+            {
+                packet.b( packetdataserializer );
+            } else {
+                packet.writeSnapshot( packetdataserializer );
+            }
+            this.c.b(integer.intValue(), (long) packetdataserializer.readableBytes());
+        }
+    }
+
+    protected void encode(ChannelHandlerContext channelhandlercontext, Object object, ByteBuf bytebuf) throws IOException
+    {
+        this.a(channelhandlercontext, (Packet) object, bytebuf);
+    }
+}
diff --git a/src/main/java/net/minecraft/server/PacketLoginOutSuccess.java b/src/main/java/net/minecraft/server/PacketLoginOutSuccess.java
new file mode 100644
index 0000000..3aa93cd
--- /dev/null
+++ b/src/main/java/net/minecraft/server/PacketLoginOutSuccess.java
@@ -0,0 +1,51 @@
+package net.minecraft.server;
+
+import net.minecraft.util.com.mojang.authlib.GameProfile;
+
+import java.io.IOException;
+
+public class PacketLoginOutSuccess extends Packet {
+
+    private GameProfile a;
+
+    public PacketLoginOutSuccess() {}
+
+    public PacketLoginOutSuccess(GameProfile gameprofile) {
+        this.a = gameprofile;
+    }
+
+    public void a(PacketDataSerializer packetdataserializer) throws IOException
+    {
+        String s = packetdataserializer.c(36);
+        String s1 = packetdataserializer.c(16);
+
+        this.a = new GameProfile(s, s1);
+    }
+
+    public void b(PacketDataSerializer packetdataserializer) throws IOException
+    {
+        packetdataserializer.a(this.a.getId());
+        packetdataserializer.a(this.a.getName());
+    }
+
+    // Spigot start
+    @Override
+    public void writeSnapshot(PacketDataSerializer packetdataserializer) throws IOException
+    {
+        packetdataserializer.a( EntityHuman.a( this.a ).toString() );
+        packetdataserializer.a( this.a.getName());
+    }
+    // Spigot end
+
+    public void a(PacketLoginOutListener packetloginoutlistener) {
+        packetloginoutlistener.a(this);
+    }
+
+    public boolean a() {
+        return true;
+    }
+
+    public void handle(PacketListener packetlistener) {
+        this.a((PacketLoginOutListener) packetlistener);
+    }
+}
diff --git a/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java b/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java
index 8bab528..5483641 100644
--- a/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java
+++ b/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java
@@ -2,6 +2,7 @@ package net.minecraft.server;
 
 import java.util.List;
 
+import org.spigotmc.authlib.properties.Property;
 import net.minecraft.util.com.mojang.authlib.GameProfile;
 
 import java.io.IOException; // CraftBukkit
@@ -33,7 +34,29 @@ public class PacketPlayOutNamedEntitySpawn extends Packet {
 
         this.h = itemstack == null ? 0 : Item.b(itemstack.getItem());
         this.i = entityhuman.getDataWatcher();
+
+        // Spigot start - Validate Profile
+        validate();
+    }
+
+    private void validate()
+    {
+        if ( MinecraftServer.getServer().getOnlineMode() )
+        {
+            if ( this.b instanceof ThreadPlayerLookupUUID.NewGameProfileWrapper )
+            {
+                org.spigotmc.authlib.GameProfile newProfile = ( (ThreadPlayerLookupUUID.NewGameProfileWrapper) this.b ).newProfile;
+                if ( MinecraftServer.getServer().newSessionService.getTextures( newProfile, true ).size() == 0 )
+                {
+                    throw new IllegalArgumentException( "PacketPlayOutNamedEntitySpawn requires a valid profile in online mode" );
+                }
+            } else
+            {
+                throw new IllegalArgumentException( "PacketPlayOutNamedEntitySpawn requires a valid profile in online mode" );
+            }
+        }
     }
+    // Spigot end
 
     public void a(PacketDataSerializer packetdataserializer) throws IOException { // CraftBukkit - added throws
         this.a = packetdataserializer.a();
@@ -60,6 +83,42 @@ public class PacketPlayOutNamedEntitySpawn extends Packet {
         this.i.a(packetdataserializer);
     }
 
+    // Spigot start
+    @Override
+    public void writeSnapshot(PacketDataSerializer packetdataserializer) throws IOException
+    { // CraftBukkit - added throws
+        validate();
+        packetdataserializer.b( this.a );
+        packetdataserializer.a( EntityHuman.a( this.b ).toString() );
+        packetdataserializer.a( this.b.getName().length() > 16 ? this.b.getName().substring( 0, 16 ) : this.b.getName() ); // CraftBukkit - Limit name length to 16 characters
+
+        if ( this.b instanceof ThreadPlayerLookupUUID.NewGameProfileWrapper )
+        {
+            org.spigotmc.authlib.GameProfile newProfile = ((ThreadPlayerLookupUUID.NewGameProfileWrapper) b).newProfile;
+            packetdataserializer.b( newProfile.getProperties().size() );
+            for ( String key : newProfile.getProperties().keys() )
+            {
+                for ( Property prop : newProfile.getProperties().get( key ) )
+                {
+                    packetdataserializer.a( prop.getName() );
+                    packetdataserializer.a( prop.getValue() );
+                    packetdataserializer.a( prop.getSignature() );
+                }
+            }
+        } else {
+            packetdataserializer.b( 0 );
+        }
+        packetdataserializer.writeInt( this.c );
+        packetdataserializer.writeInt( this.d );
+        packetdataserializer.writeInt( this.e );
+        packetdataserializer.writeByte( this.f );
+        packetdataserializer.writeByte( this.g );
+        packetdataserializer.writeShort( this.h );
+        this.i.a( packetdataserializer );
+    }
+
+    // Spigot end
+
     public void a(PacketPlayOutListener packetplayoutlistener) {
         packetplayoutlistener.a(this);
     }
diff --git a/src/main/java/net/minecraft/server/PacketPlayOutTileEntityData.java b/src/main/java/net/minecraft/server/PacketPlayOutTileEntityData.java
new file mode 100644
index 0000000..005f1fe
--- /dev/null
+++ b/src/main/java/net/minecraft/server/PacketPlayOutTileEntityData.java
@@ -0,0 +1,61 @@
+package net.minecraft.server;
+
+public class PacketPlayOutTileEntityData extends Packet {
+
+    private int a;
+    private int b;
+    private int c;
+    private int d;
+    private NBTTagCompound e;
+
+    public PacketPlayOutTileEntityData() {}
+
+    public PacketPlayOutTileEntityData(int i, int j, int k, int l, NBTTagCompound nbttagcompound) {
+        this.a = i;
+        this.b = j;
+        this.c = k;
+        this.d = l;
+        this.e = nbttagcompound;
+    }
+
+    public void a(PacketDataSerializer packetdataserializer) {
+        this.a = packetdataserializer.readInt();
+        this.b = packetdataserializer.readShort();
+        this.c = packetdataserializer.readInt();
+        this.d = packetdataserializer.readUnsignedByte();
+        this.e = packetdataserializer.b();
+    }
+
+    public void b(PacketDataSerializer packetdataserializer) {
+        packetdataserializer.writeInt(this.a);
+        packetdataserializer.writeShort(this.b);
+        packetdataserializer.writeInt(this.c);
+        packetdataserializer.writeByte((byte) this.d);
+        packetdataserializer.a(this.e);
+    }
+
+    @Override
+    public void writeSnapshot(PacketDataSerializer packetdataserializer)
+    {
+        packetdataserializer.writeInt(this.a);
+        packetdataserializer.writeShort(this.b);
+        packetdataserializer.writeInt(this.c);
+        packetdataserializer.writeByte((byte) this.d);
+        if ( this.e.hasKey( "ExtraType" ) )
+        {
+            NBTTagCompound profile = new NBTTagCompound();
+            profile.setString( "Name", this.e.getString( "ExtraType" ) );
+            profile.setString( "Id", "" );
+            this.e.set( "Owner", profile );
+        }
+        packetdataserializer.a(this.e);
+    }
+
+    public void a(PacketPlayOutListener packetplayoutlistener) {
+        packetplayoutlistener.a(this);
+    }
+
+    public void handle(PacketListener packetlistener) {
+        this.a((PacketPlayOutListener) packetlistener);
+    }
+}
diff --git a/src/main/java/net/minecraft/server/PacketStatusListener.java b/src/main/java/net/minecraft/server/PacketStatusListener.java
index f9da452..fa493ca 100644
--- a/src/main/java/net/minecraft/server/PacketStatusListener.java
+++ b/src/main/java/net/minecraft/server/PacketStatusListener.java
@@ -4,6 +4,7 @@ import java.net.InetSocketAddress;
 
 // CraftBukkit start
 import java.util.Iterator;
+import java.util.UUID;
 
 import org.bukkit.craftbukkit.util.CraftIconCache;
 import org.bukkit.entity.Player;
@@ -117,13 +118,22 @@ public class PacketStatusListener implements PacketStatusInListener {
             profiles = profiles.subList( 0, Math.min( profiles.size(), org.spigotmc.SpigotConfig.playerSample ) ); // Cap the sample to n (or less) displayed players, ie: Vanilla behaviour
         }
         // Spigot End
-        playerSample.a(profiles.toArray(new GameProfile[profiles.size()]));
+        // Spigot start
+        GameProfile[] aProfiles = profiles.toArray( new GameProfile[ profiles.size() ] );
+        if ( networkManager.m.attr( HandshakeListener.protocolVersion ).get() == 5 )
+        {
+            for (int i = 0; i < aProfiles.length; i++) {
+                aProfiles[i] = new GameProfileWrapper( EntityHuman.a( aProfiles[i] ), aProfiles[i].getName() );
+            }
+        }
+        // Spigot end
+        playerSample.a(aProfiles);
 
         ServerPing ping = new ServerPing();
         ping.setFavicon(event.icon.value);
         ping.setMOTD(new ChatComponentText(event.getMotd()));
         ping.setPlayerSample(playerSample);
-        ping.setServerInfo(new ServerPingServerData(minecraftServer.getServerModName() + " " + minecraftServer.getVersion(), 4)); // TODO: Update when protocol changes
+        ping.setServerInfo(new ServerPingServerData(minecraftServer.getServerModName() + " " + minecraftServer.getVersion(), networkManager.m.attr( HandshakeListener.protocolVersion ).get())); // Spigot // TODO: Update when protocol changes
 
         this.networkManager.handle(new PacketStatusOutServerInfo(ping), new GenericFutureListener[0]);
         // CraftBukkit end
@@ -132,4 +142,23 @@ public class PacketStatusListener implements PacketStatusInListener {
     public void a(PacketStatusInPing packetstatusinping) {
         this.networkManager.handle(new PacketStatusOutPong(packetstatusinping.c()), new GenericFutureListener[0]);
     }
+
+
+    // Spigot start
+    private static class GameProfileWrapper extends GameProfile {
+
+        private final UUID uuid;
+
+        public GameProfileWrapper(UUID uuid, String name) {
+            super("", name);
+            this.uuid = uuid;
+        }
+
+        @Override
+        public String getId() {
+            return uuid.toString();
+        }
+    }
+
+    // Spigot end
 }
diff --git a/src/main/java/net/minecraft/server/ThreadPlayerLookupUUID.java b/src/main/java/net/minecraft/server/ThreadPlayerLookupUUID.java
index fe4502a..63101fb 100644
--- a/src/main/java/net/minecraft/server/ThreadPlayerLookupUUID.java
+++ b/src/main/java/net/minecraft/server/ThreadPlayerLookupUUID.java
@@ -33,7 +33,9 @@ class ThreadPlayerLookupUUID extends Thread {
             }
             // Spigot End
             String s = (new BigInteger(MinecraftEncryption.a(LoginListener.a(this.a), LoginListener.b(this.a).J().getPublic(), LoginListener.c(this.a)))).toString(16);
-            LoginListener.a(this.a, LoginListener.b(this.a).at().hasJoinedServer(new GameProfile((String) null, LoginListener.d(this.a).getName()), s));
+            //LoginListener.a(this.a, LoginListener.b(this.a).at().hasJoinedServer(new GameProfile((String) null, LoginListener.d(this.a).getName()), s));
+            org.spigotmc.authlib.GameProfile profile = LoginListener.b(this.a).newSessionService.hasJoinedServer( new org.spigotmc.authlib.GameProfile( null, LoginListener.d(this.a).getName() ), s );
+            LoginListener.a(this.a, new NewGameProfileWrapper( profile ) );
             if (LoginListener.d(this.a) != null) {
                 // Spigot Start
                 fireLoginEvents();
@@ -95,4 +97,15 @@ class ThreadPlayerLookupUUID extends Thread {
         }
         // CraftBukkit end
     }
+
+    public static class NewGameProfileWrapper extends GameProfile {
+
+        public org.spigotmc.authlib.GameProfile newProfile;
+
+        public NewGameProfileWrapper(org.spigotmc.authlib.GameProfile newProfile)
+        {
+            super( newProfile.getId().toString().replaceAll( "-", "" ), newProfile.getName() );
+            this.newProfile = newProfile;
+        }
+    }
 }
diff --git a/src/main/java/org/spigotmc/authlib/Agent.java b/src/main/java/org/spigotmc/authlib/Agent.java
new file mode 100644
index 0000000..873743d
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/Agent.java
@@ -0,0 +1,30 @@
+package org.spigotmc.authlib;
+
+public class Agent {
+    public static final Agent MINECRAFT = new Agent("Minecraft", 1);
+    public static final Agent SCROLLS = new Agent("Scrolls", 1);
+
+    private final String name;
+    private final int version;
+
+    public Agent(String name, int version) {
+        this.name = name;
+        this.version = version;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getVersion() {
+        return version;
+    }
+
+    @Override
+    public String toString() {
+        return "Agent{" +
+                "name='" + name + '\'' +
+                ", version=" + version +
+                '}';
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/AuthenticationService.java b/src/main/java/org/spigotmc/authlib/AuthenticationService.java
new file mode 100644
index 0000000..4110e53
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/AuthenticationService.java
@@ -0,0 +1,33 @@
+package org.spigotmc.authlib;
+
+import org.spigotmc.authlib.minecraft.MinecraftSessionService;
+
+public interface AuthenticationService {
+    /**
+     * Creates a relevant {@link org.spigotmc.authlib.UserAuthentication} designed for this authentication service.
+     * <p />
+     * Certain Authentication Services may have restrictions as to which {@link Agent}s are supported.
+     * Please consult their javadoc for more information.
+     *
+     * @param agent Game agent to authenticate for
+     * @throws java.lang.IllegalArgumentException Agent is null or not allowed for this AuthenticationService
+     * @return New user authenticator
+     */
+    public UserAuthentication createUserAuthentication(Agent agent);
+
+    /**
+     * Creates a relevant {@link org.spigotmc.authlib.minecraft.MinecraftSessionService} designed for this authentication service.
+     * </p>
+     * This is a Minecraft specific service and is not relevant to any other game agent.
+     *
+     * @return New minecraft session service
+     */
+    public MinecraftSessionService createMinecraftSessionService();
+
+    /**
+     * Creates a relevant {@link org.spigotmc.authlib.GameProfileRepository} designed for this authentication service.
+     *
+     * @return New profile repository
+     */
+    public GameProfileRepository createProfileRepository();
+}
diff --git a/src/main/java/org/spigotmc/authlib/BaseAuthenticationService.java b/src/main/java/org/spigotmc/authlib/BaseAuthenticationService.java
new file mode 100644
index 0000000..b3cb3bb
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/BaseAuthenticationService.java
@@ -0,0 +1,4 @@
+package org.spigotmc.authlib;
+
+public abstract class BaseAuthenticationService implements AuthenticationService {
+}
diff --git a/src/main/java/org/spigotmc/authlib/BaseUserAuthentication.java b/src/main/java/org/spigotmc/authlib/BaseUserAuthentication.java
new file mode 100644
index 0000000..3bdcea2
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/BaseUserAuthentication.java
@@ -0,0 +1,268 @@
+package org.spigotmc.authlib;
+
+import org.spigotmc.authlib.properties.Property;
+import org.spigotmc.authlib.properties.PropertyMap;
+import org.spigotmc.authlib.util.UUIDTypeAdapter;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.Validate;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public abstract class BaseUserAuthentication implements UserAuthentication {
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    protected static final String STORAGE_KEY_PROFILE_NAME = "displayName";
+    protected static final String STORAGE_KEY_PROFILE_ID = "uuid";
+    protected static final String STORAGE_KEY_PROFILE_PROPERTIES = "profileProperties";
+    protected static final String STORAGE_KEY_USER_NAME = "username";
+    protected static final String STORAGE_KEY_USER_ID = "userid";
+    protected static final String STORAGE_KEY_USER_PROPERTIES = "userProperties";
+
+    private final AuthenticationService authenticationService;
+    private final PropertyMap userProperties = new PropertyMap();
+    private String userid;
+    private String username;
+    private String password;
+    private GameProfile selectedProfile;
+    private UserType userType;
+
+    protected BaseUserAuthentication(AuthenticationService authenticationService) {
+        Validate.notNull(authenticationService);
+        this.authenticationService = authenticationService;
+    }
+
+    @Override
+    public boolean canLogIn() {
+        return !canPlayOnline() && StringUtils.isNotBlank(getUsername()) && StringUtils.isNotBlank(getPassword());
+    }
+
+    @Override
+    public void logOut() {
+        password = null;
+        userid = null;
+        setSelectedProfile(null);
+        getModifiableUserProperties().clear();
+        setUserType(null);
+    }
+
+    @Override
+    public boolean isLoggedIn() {
+        return getSelectedProfile() != null;
+    }
+
+    @Override
+    public void setUsername(String username) {
+        if (isLoggedIn() && canPlayOnline()) {
+            throw new IllegalStateException("Cannot change username whilst logged in & online");
+        }
+
+        this.username = username;
+    }
+
+    @Override
+    public void setPassword(String password) {
+        if (isLoggedIn() && canPlayOnline() && StringUtils.isNotBlank(password)) {
+            throw new IllegalStateException("Cannot set password whilst logged in & online");
+        }
+
+        this.password = password;
+    }
+
+    protected String getUsername() {
+        return username;
+    }
+
+    protected String getPassword() {
+        return password;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public void loadFromStorage(Map<String, Object> credentials) {
+        logOut();
+
+        setUsername(String.valueOf(credentials.get(STORAGE_KEY_USER_NAME)));
+
+        if (credentials.containsKey(STORAGE_KEY_USER_ID)) {
+            userid = String.valueOf(credentials.get(STORAGE_KEY_USER_ID));
+        } else {
+            userid = username;
+        }
+
+        if (credentials.containsKey(STORAGE_KEY_USER_PROPERTIES)) {
+            try {
+                List<Map<String, String>> list = (List<Map<String, String>>) credentials.get(STORAGE_KEY_USER_PROPERTIES);
+
+                for (Map<String, String> propertyMap : list) {
+                    String name = propertyMap.get("name");
+                    String value = propertyMap.get("value");
+                    String signature = propertyMap.get("signature");
+
+                    if (signature == null) {
+                        getModifiableUserProperties().put(name, new Property(name, value));
+                    } else {
+                        getModifiableUserProperties().put(name, new Property(name, value, signature));
+                    }
+                }
+            } catch (Throwable t) {
+                LOGGER.warn("Couldn't deserialize user properties", t);
+            }
+        }
+
+        if (credentials.containsKey(STORAGE_KEY_PROFILE_NAME) && credentials.containsKey(STORAGE_KEY_PROFILE_ID)) {
+            GameProfile profile = new GameProfile(UUIDTypeAdapter.fromString(String.valueOf(credentials.get(STORAGE_KEY_PROFILE_ID))), String.valueOf(credentials.get(STORAGE_KEY_PROFILE_NAME)));
+            if (credentials.containsKey(STORAGE_KEY_PROFILE_PROPERTIES)) {
+                try {
+                    List<Map<String, String>> list = (List<Map<String, String>>) credentials.get(STORAGE_KEY_PROFILE_PROPERTIES);
+                    for (Map<String, String> propertyMap : list) {
+                        String name = propertyMap.get("name");
+                        String value = propertyMap.get("value");
+                        String signature = propertyMap.get("signature");
+
+                        if (signature == null) {
+                            profile.getProperties().put(name, new Property(name, value));
+                        } else {
+                            profile.getProperties().put(name, new Property(name, value, signature));
+                        }
+                    }
+                } catch (Throwable t) {
+                    LOGGER.warn("Couldn't deserialize profile properties", t);
+                }
+            }
+            setSelectedProfile(profile);
+        }
+    }
+
+    @Override
+    public Map<String, Object> saveForStorage() {
+        Map<String, Object> result = new HashMap<String, Object>();
+
+        if (getUsername() != null) {
+            result.put(STORAGE_KEY_USER_NAME, getUsername());
+        }
+        if (getUserID() != null) {
+            result.put(STORAGE_KEY_USER_ID, getUserID());
+        } else if (getUsername() != null) {
+            result.put(STORAGE_KEY_USER_NAME, getUsername());
+        }
+
+        if (!getUserProperties().isEmpty()) {
+            List<Map<String, String>> properties = new ArrayList<Map<String, String>>();
+            for (Property userProperty : getUserProperties().values()) {
+                Map<String, String> property = new HashMap<String, String>();
+                property.put("name", userProperty.getName());
+                property.put("value", userProperty.getValue());
+                property.put("signature", userProperty.getSignature());
+                properties.add(property);
+            }
+            result.put(STORAGE_KEY_USER_PROPERTIES, properties);
+        }
+
+        GameProfile selectedProfile = getSelectedProfile();
+        if (selectedProfile != null) {
+            result.put(STORAGE_KEY_PROFILE_NAME, selectedProfile.getName());
+            result.put(STORAGE_KEY_PROFILE_ID, selectedProfile.getId());
+
+            List<Map<String, String>> properties = new ArrayList<Map<String, String>>();
+            for (Property profileProperty : selectedProfile.getProperties().values()) {
+                Map<String, String> property = new HashMap<String, String>();
+                property.put("name", profileProperty.getName());
+                property.put("value", profileProperty.getValue());
+                property.put("signature", profileProperty.getSignature());
+                properties.add(property);
+            }
+
+            if (!properties.isEmpty()) {
+                result.put(STORAGE_KEY_PROFILE_PROPERTIES, properties);
+            }
+        }
+
+        return result;
+    }
+
+    protected void setSelectedProfile(GameProfile selectedProfile) {
+        this.selectedProfile = selectedProfile;
+    }
+
+    @Override
+    public GameProfile getSelectedProfile() {
+        return selectedProfile;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder result = new StringBuilder();
+
+        result.append(getClass().getSimpleName());
+        result.append("{");
+
+        if (isLoggedIn()) {
+            result.append("Logged in as ");
+            result.append(getUsername());
+
+            if (getSelectedProfile() != null) {
+                result.append(" / ");
+                result.append(getSelectedProfile());
+                result.append(" - ");
+
+                if (canPlayOnline()) {
+                    result.append("Online");
+                } else {
+                    result.append("Offline");
+                }
+            }
+        } else {
+            result.append("Not logged in");
+        }
+
+        result.append("}");
+
+        return result.toString();
+    }
+
+    public AuthenticationService getAuthenticationService() {
+        return authenticationService;
+    }
+
+    @Override
+    public String getUserID() {
+        return userid;
+    }
+
+    @Override
+    public PropertyMap getUserProperties() {
+        if (isLoggedIn()) {
+            PropertyMap result = new PropertyMap();
+            result.putAll(getModifiableUserProperties());
+            return result;
+        } else {
+            return new PropertyMap();
+        }
+    }
+
+    protected PropertyMap getModifiableUserProperties() {
+        return userProperties;
+    }
+
+    @Override
+    public UserType getUserType() {
+        if (isLoggedIn()) {
+            return userType == null ? UserType.LEGACY : userType;
+        } else {
+            return null;
+        }
+    }
+
+    protected void setUserType(UserType userType) {
+        this.userType = userType;
+    }
+
+    protected void setUserid(String userid) {
+        this.userid = userid;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/GameProfile.java b/src/main/java/org/spigotmc/authlib/GameProfile.java
new file mode 100644
index 0000000..7e2d997
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/GameProfile.java
@@ -0,0 +1,106 @@
+package org.spigotmc.authlib;
+
+import org.spigotmc.authlib.properties.PropertyMap;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.builder.ToStringBuilder;
+
+import java.util.UUID;
+
+public class GameProfile {
+    private final UUID id;
+    private final String name;
+    private final PropertyMap properties = new PropertyMap();
+    private boolean legacy;
+
+    /**
+     * Constructs a new Game Profile with the specified ID and name.
+     * <p />
+     * Either ID or name may be null/empty, but at least one must be filled.
+     *
+     * @param id Unique ID of the profile
+     * @param name Display name of the profile
+     * @throws java.lang.IllegalArgumentException Both ID and name are either null or empty
+     */
+    public GameProfile(UUID id, String name) {
+        if (id == null && StringUtils.isBlank(name)) throw new IllegalArgumentException("Name and ID cannot both be blank");
+
+        this.id = id;
+        this.name = name;
+    }
+
+    /**
+     * Gets the unique ID of this game profile.
+     * <p />
+     * This may be null for partial profile data if constructed manually.
+     *
+     * @return ID of the profile
+     */
+    public UUID getId() {
+        return id;
+    }
+
+    /**
+     * Gets the display name of this game profile.
+     * <p />
+     * This may be null for partial profile data if constructed manually.
+     *
+     * @return Name of the profile
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Returns any known properties about this game profile.
+     *
+     * @return Modifiable map of profile properties.
+     */
+    public PropertyMap getProperties() {
+        return properties;
+    }
+
+    /**
+     * Checks if this profile is complete.
+     * <p />
+     * A complete profile has no empty fields. Partial profiles may be constructed manually and used as input to methods.
+     *
+     * @return True if this profile is complete (as opposed to partial)
+     */
+    public boolean isComplete() {
+        return id != null && StringUtils.isNotBlank(getName());
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GameProfile that = (GameProfile) o;
+
+        if (id != null ? !id.equals(that.id) : that.id != null) return false;
+        if (name != null ? !name.equals(that.name) : that.name != null) return false;
+
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = id != null ? id.hashCode() : 0;
+        result = 31 * result + (name != null ? name.hashCode() : 0);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return new ToStringBuilder(this)
+                .append("id", id)
+                .append("name", name)
+                .append("properties", properties)
+                .append("legacy", legacy)
+                .toString();
+    }
+
+    public boolean isLegacy() {
+        return legacy;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/GameProfileRepository.java b/src/main/java/org/spigotmc/authlib/GameProfileRepository.java
new file mode 100644
index 0000000..83864b5
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/GameProfileRepository.java
@@ -0,0 +1,5 @@
+package org.spigotmc.authlib;
+
+public interface GameProfileRepository {
+    public void findProfilesByNames(String[] names, Agent agent, ProfileLookupCallback callback);
+}
diff --git a/src/main/java/org/spigotmc/authlib/HttpAuthenticationService.java b/src/main/java/org/spigotmc/authlib/HttpAuthenticationService.java
new file mode 100644
index 0000000..fb639d0
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/HttpAuthenticationService.java
@@ -0,0 +1,218 @@
+package org.spigotmc.authlib;
+
+import org.apache.commons.io.Charsets;
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang3.Validate;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
+import java.net.*;
+import java.util.Map;
+
+public abstract class HttpAuthenticationService extends BaseAuthenticationService {
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    private final Proxy proxy;
+
+    protected HttpAuthenticationService(Proxy proxy) {
+        Validate.notNull(proxy);
+        this.proxy = proxy;
+    }
+
+    /**
+     * Gets the proxy to be used with every HTTP(S) request.
+     *
+     * @return Proxy to be used.
+     */
+    public Proxy getProxy() {
+        return proxy;
+    }
+
+    protected HttpURLConnection createUrlConnection(URL url) throws IOException {
+        Validate.notNull(url);
+        LOGGER.debug("Opening connection to " + url);
+        HttpURLConnection connection = (HttpURLConnection) url.openConnection(proxy);
+        connection.setConnectTimeout(15000);
+        connection.setReadTimeout(15000);
+        connection.setUseCaches(false);
+        return connection;
+    }
+
+    /**
+     * Performs a POST request to the specified URL and returns the result.
+     * <p />
+     * The POST data will be encoded in UTF-8 as the specified contentType. The response will be parsed as UTF-8.
+     * If the server returns an error but still provides a body, the body will be returned as normal.
+     * If the server returns an error without any body, a relevant {@link java.io.IOException} will be thrown.
+     *
+     * @param url URL to submit the POST request to
+     * @param post POST data in the correct format to be submitted
+     * @param contentType Content type of the POST data
+     * @return Raw text response from the server
+     * @throws IOException The request was not successful
+     */
+    public String performPostRequest(URL url, String post, String contentType) throws IOException {
+        Validate.notNull(url);
+        Validate.notNull(post);
+        Validate.notNull(contentType);
+        HttpURLConnection connection = createUrlConnection(url);
+        byte[] postAsBytes = post.getBytes(Charsets.UTF_8);
+
+        connection.setRequestProperty("Content-Type", contentType + "; charset=utf-8");
+        connection.setRequestProperty("Content-Length", "" + postAsBytes.length);
+        connection.setDoOutput(true);
+
+        LOGGER.debug("Writing POST data to " + url + ": " + post);
+
+        OutputStream outputStream = null;
+        try {
+            outputStream = connection.getOutputStream();
+            IOUtils.write(postAsBytes, outputStream);
+        } finally {
+            IOUtils.closeQuietly(outputStream);
+        }
+
+        LOGGER.debug("Reading data from " + url);
+
+        InputStream inputStream = null;
+        try {
+            inputStream = connection.getInputStream();
+            String result = IOUtils.toString(inputStream, Charsets.UTF_8);
+            LOGGER.debug("Successful read, server response was " + connection.getResponseCode());
+            LOGGER.debug("Response: " + result);
+            return result;
+        } catch (IOException e) {
+            IOUtils.closeQuietly(inputStream);
+            inputStream = connection.getErrorStream();
+
+            if (inputStream != null) {
+                LOGGER.debug("Reading error page from " + url);
+                String result = IOUtils.toString(inputStream, Charsets.UTF_8);
+                LOGGER.debug("Successful read, server response was " + connection.getResponseCode());
+                LOGGER.debug("Response: " + result);
+                return result;
+            } else {
+                LOGGER.debug("Request failed", e);
+                throw e;
+            }
+        } finally {
+            IOUtils.closeQuietly(inputStream);
+        }
+    }
+
+    /**
+     * Performs a GET request to the specified URL and returns the result.
+     * <p />
+     * The response will be parsed as UTF-8.
+     * If the server returns an error but still provides a body, the body will be returned as normal.
+     * If the server returns an error without any body, a relevant {@link java.io.IOException} will be thrown.
+     *
+     * @param url URL to submit the GET request to
+     * @return Raw text response from the server
+     * @throws IOException The request was not successful
+     */
+    public String performGetRequest(URL url) throws IOException {
+        Validate.notNull(url);
+        HttpURLConnection connection = createUrlConnection(url);
+
+        LOGGER.debug("Reading data from " + url);
+
+        InputStream inputStream = null;
+        try {
+            inputStream = connection.getInputStream();
+            String result = IOUtils.toString(inputStream, Charsets.UTF_8);
+            LOGGER.debug("Successful read, server response was " + connection.getResponseCode());
+            LOGGER.debug("Response: " + result);
+            return result;
+        } catch (IOException e) {
+            IOUtils.closeQuietly(inputStream);
+            inputStream = connection.getErrorStream();
+
+            if (inputStream != null) {
+                LOGGER.debug("Reading error page from " + url);
+                String result = IOUtils.toString(inputStream, Charsets.UTF_8);
+                LOGGER.debug("Successful read, server response was " + connection.getResponseCode());
+                LOGGER.debug("Response: " + result);
+                return result;
+            } else {
+                LOGGER.debug("Request failed", e);
+                throw e;
+            }
+        } finally {
+            IOUtils.closeQuietly(inputStream);
+        }
+    }
+
+    /**
+     * Creates a {@link URL} with the specified string, throwing an {@link java.lang.Error} if the URL was malformed.
+     * <p />
+     * This is just a wrapper to allow URLs to be created in constants, where you know the URL is valid.
+     *
+     * @param url URL to construct
+     * @return URL constructed
+     */
+    public static URL constantURL(String url) {
+        try {
+            return new URL(url);
+        } catch (MalformedURLException ex) {
+            throw new Error("Couldn't create constant for " + url, ex);
+        }
+    }
+
+    /**
+     * Turns the specified Map into an encoded & escaped query
+     *
+     * @param query Map to convert into a text based query
+     * @return Resulting query.
+     */
+    public static String buildQuery(Map<String, Object> query) {
+        if (query == null) return "";
+        StringBuilder builder = new StringBuilder();
+
+        for (Map.Entry<String, Object> entry : query.entrySet()) {
+            if (builder.length() > 0) {
+                builder.append('&');
+            }
+
+            try {
+                builder.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
+            } catch (UnsupportedEncodingException e) {
+                LOGGER.error("Unexpected exception building query", e);
+            }
+
+            if (entry.getValue() != null) {
+                builder.append('=');
+                try {
+                    builder.append(URLEncoder.encode(entry.getValue().toString(), "UTF-8"));
+                } catch (UnsupportedEncodingException e) {
+                    LOGGER.error("Unexpected exception building query", e);
+                }
+            }
+        }
+
+        return builder.toString();
+    }
+
+    /**
+     * Concatenates the given {@link java.net.URL} and query.
+     *
+     * @param url URL to base off
+     * @param query Query to append to URL
+     * @return URL constructed
+     */
+    public static URL concatenateURL(URL url, String query) {
+        try {
+            if (url.getQuery() != null && url.getQuery().length() > 0) {
+                return new URL(url.getProtocol(), url.getHost(), url.getPort(), url.getFile() + "&" + query);
+            } else {
+                return new URL(url.getProtocol(), url.getHost(), url.getPort(), url.getFile() + "?" + query);
+            }
+        } catch (MalformedURLException ex) {
+            throw new IllegalArgumentException("Could not concatenate given URL with GET arguments!", ex);
+        }
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/HttpUserAuthentication.java b/src/main/java/org/spigotmc/authlib/HttpUserAuthentication.java
new file mode 100644
index 0000000..1020391
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/HttpUserAuthentication.java
@@ -0,0 +1,12 @@
+package org.spigotmc.authlib;
+
+public abstract class HttpUserAuthentication extends BaseUserAuthentication {
+    protected HttpUserAuthentication(HttpAuthenticationService authenticationService) {
+        super(authenticationService);
+    }
+
+    @Override
+    public HttpAuthenticationService getAuthenticationService() {
+        return (HttpAuthenticationService) super.getAuthenticationService();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/ProfileLookupCallback.java b/src/main/java/org/spigotmc/authlib/ProfileLookupCallback.java
new file mode 100644
index 0000000..5ec92d1
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/ProfileLookupCallback.java
@@ -0,0 +1,7 @@
+package org.spigotmc.authlib;
+
+public interface ProfileLookupCallback {
+    public void onProfileLookupSucceeded(GameProfile profile);
+
+    public void onProfileLookupFailed(GameProfile profile, Exception exception);
+}
diff --git a/src/main/java/org/spigotmc/authlib/UserAuthentication.java b/src/main/java/org/spigotmc/authlib/UserAuthentication.java
new file mode 100644
index 0000000..0f65242
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/UserAuthentication.java
@@ -0,0 +1,170 @@
+package org.spigotmc.authlib;
+
+import com.google.common.collect.Multimap;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.properties.Property;
+import org.spigotmc.authlib.properties.PropertyMap;
+
+import java.util.Map;
+
+public interface UserAuthentication {
+    /**
+     * Checks if enough details are provided to attempt authentication.
+     * <p />
+     * The exact details required may depend on the service, but generally Username & Password should suffice.
+     * Attempting to call {@link #logIn()} when this method returns false will guarantee a failure. You may use
+     * this method to check if you can attempt a log in without altering the current state of the authentication.
+     *
+     * @return True if authentication may be attempted in this state
+     */
+    boolean canLogIn();
+
+    /**
+     * Attempts authentication with the currently set details.
+     * <p />
+     * If {@link #canLogIn()} returned false, this method is guaranteed to fail. However, an appropriate exception
+     * will be raised informing you as to why it failed. The exact required credentials to authenticate varies on
+     * the service being used, but generally {@link #setUsername(String) username} and {@link #setPassword(String) password} are a safe
+     * bet to log a user in.
+     * <p />
+     * If the user is {@link #isLoggedIn() already logged in} this method will <b>not</b> fail early and will continue
+     * to reauthenticate the user. If the user is attempting to log in with a legacy username ("Steve")
+     * and that username is valid but migrated to a Mojang account ("steve@minecraft.net"), a {@link org.spigotmc.authlib.exceptions.UserMigratedException}
+     * will be thrown.
+     *
+     * @throws org.spigotmc.authlib.exceptions.AuthenticationUnavailableException Thrown when the servers return a malformed response, or are otherwise unavailable
+     * @throws org.spigotmc.authlib.exceptions.InvalidCredentialsException Thrown when the specified credentials are invalid
+     * @throws org.spigotmc.authlib.exceptions.UserMigratedException Thrown when attempting to authenticate with a {@link #setUsername(String) username} that has been migrated to an email address
+     * @throws org.spigotmc.authlib.exceptions.AuthenticationException Generic exception indicating that we could not authenticate the user
+     */
+    void logIn() throws AuthenticationException;
+
+    /**
+     * Logs this user out, clearing any local credentials.
+     */
+    void logOut();
+
+    /**
+     * Checks if the user is currently logged in.
+     *
+     * @return True if the user is logged in
+     */
+    boolean isLoggedIn();
+
+    /**
+     * Checks if the user {@link #isLoggedIn() is logged in}, has a valid {@link #getSelectedProfile() game profile} and has validated
+     * their session online.
+     *
+     * @return True if the user is allowed to play online
+     */
+    boolean canPlayOnline();
+
+    /**
+     * Gets a list of valid {@link GameProfile GameProfiles} for this user.
+     * <p />
+     * Calling this method whilst the user is not {@link #isLoggedIn() logged in} will always return null.
+     * If the result of this method is an empty array or null and the user is logged in, the user is considered to not have purchased the game but
+     * may be allowed to play demo mode.
+     *
+     * @return An array of available game profiles, or null.
+     */
+    GameProfile[] getAvailableProfiles();
+
+    /**
+     * Gets the currently selected {@link GameProfile} for this user.
+     * <p />
+     * Calling this method whilst the user is not {@link #isLoggedIn() logged in} or has no {@link #getAvailableProfiles() available profiles} will always return null.
+     *
+     * @return Users currently selected Game Profile
+     */
+    GameProfile getSelectedProfile();
+
+    /**
+     * Attempts to select the specified {@link GameProfile}.
+     * <p />
+     * The user must be {@link #isLoggedIn() logged in}, have no {@link #getSelectedProfile() currently selected game profile} and the specified profile must
+     * be retrieved from {@link #getAvailableProfiles()}.
+     *
+     * @param profile The game profile to select.
+     * @throws java.lang.IllegalArgumentException Profile is null or did not come from {@link #getAvailableProfiles()}
+     * @throws org.spigotmc.authlib.exceptions.AuthenticationException User is not currently {@link #isLoggedIn() logged in},
+     * or already has a {@link #getSelectedProfile() selected profile},
+     * or the authentication service did not allow the profile change
+     * @throws org.spigotmc.authlib.exceptions.AuthenticationUnavailableException Thrown when the servers return a malformed response, or are otherwise unavailable
+     */
+    void selectGameProfile(GameProfile profile) throws AuthenticationException;
+
+    /**
+     * Tries to load any stored details that may be used for authentication from a given Map.
+     * <p />
+     * This may be used to load an approximation of the current state from a past {@link org.spigotmc.authlib.UserAuthentication} with {@link #saveForStorage()}.
+     *
+     * @param credentials Map to load credentials or state from
+     */
+    void loadFromStorage(Map<String, Object> credentials);
+
+    /**
+     * Saves any known credentials to a Map and returns the result.
+     * <p />
+     * This may be used to save an approximation of the current state for a future {@link org.spigotmc.authlib.UserAuthentication} with {@link #loadFromStorage(java.util.Map)}.
+     *
+     * @return Map containing any saved credentials and state for storage
+     */
+    Map<String, Object> saveForStorage();
+
+    /**
+     * Sets the username to authenticate with for the next {@link #logIn()} call.
+     * <p />
+     * You may not call this method whilst the user is {@link #isLoggedIn() logged in}.
+     *
+     * @param username Username to authenticate with
+     * @throws java.lang.IllegalStateException User is already logged in
+     */
+    void setUsername(String username);
+
+    /**
+     * Sets the password to authenticate with for the next {@link #logIn()} call.
+     * <p />
+     * You may not call this method with a non-null and non-empty string whilst the user is {@link #isLoggedIn() logged in}.
+     *
+     * @param password Password to authenticate with
+     * @throws java.lang.IllegalStateException User is already logged in and the password is non-null & non-empty
+     */
+    void setPassword(String password);
+
+    /**
+     * Gets an authenticated token for use in authenticated API calls.
+     *
+     * @return Authenticated token for the current user, or null if not logged in.
+     */
+    public String getAuthenticatedToken();
+
+    /**
+     * Gets the unique ID of the currently logged in user.
+     * <p />
+     * This method will return null if the user is not logged in.
+     *
+     * @return Unique ID of the currently logged in user, or null if not logged in
+     */
+    public String getUserID();
+
+    /**
+     * Gets a Multimap of properties bound to the currently logged in user.
+     * <p />
+     * This method will return an empty Multimap if the user is not logged in.
+     * <p />
+     * The returned Multimap will ignore any changes.
+     *
+     * @return Multimap of user properties.
+     */
+    public PropertyMap getUserProperties();
+
+    /**
+     * Gets the type of the currently logged in user.
+     * <p />
+     * This method will return null if the user is not logged in.
+     *
+     * @return Type of current logged in user, or null.
+     */
+    public UserType getUserType();
+}
diff --git a/src/main/java/org/spigotmc/authlib/UserType.java b/src/main/java/org/spigotmc/authlib/UserType.java
new file mode 100644
index 0000000..6ca7eff
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/UserType.java
@@ -0,0 +1,30 @@
+package org.spigotmc.authlib;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public enum UserType {
+    LEGACY("legacy"),
+    MOJANG("mojang");
+
+    private static final Map<String, UserType> BY_NAME = new HashMap<String, UserType>();
+    private final String name;
+
+    private UserType(String name) {
+        this.name = name;
+    }
+
+    public static UserType byName(String name) {
+        return BY_NAME.get(name.toLowerCase());
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    static {
+        for (UserType type : UserType.values()) {
+            BY_NAME.put(type.name, type);
+        }
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/exceptions/AuthenticationException.java b/src/main/java/org/spigotmc/authlib/exceptions/AuthenticationException.java
new file mode 100644
index 0000000..5366bbf
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/exceptions/AuthenticationException.java
@@ -0,0 +1,18 @@
+package org.spigotmc.authlib.exceptions;
+
+public class AuthenticationException extends Exception {
+    public AuthenticationException() {
+    }
+
+    public AuthenticationException(String message) {
+        super(message);
+    }
+
+    public AuthenticationException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public AuthenticationException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/exceptions/AuthenticationUnavailableException.java b/src/main/java/org/spigotmc/authlib/exceptions/AuthenticationUnavailableException.java
new file mode 100644
index 0000000..f953f2c
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/exceptions/AuthenticationUnavailableException.java
@@ -0,0 +1,21 @@
+package org.spigotmc.authlib.exceptions;
+
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+
+public class AuthenticationUnavailableException extends AuthenticationException
+{
+    public AuthenticationUnavailableException() {
+    }
+
+    public AuthenticationUnavailableException(String message) {
+        super(message);
+    }
+
+    public AuthenticationUnavailableException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public AuthenticationUnavailableException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/exceptions/InvalidCredentialsException.java b/src/main/java/org/spigotmc/authlib/exceptions/InvalidCredentialsException.java
new file mode 100644
index 0000000..edf8074
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/exceptions/InvalidCredentialsException.java
@@ -0,0 +1,21 @@
+package org.spigotmc.authlib.exceptions;
+
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+
+public class InvalidCredentialsException extends AuthenticationException
+{
+    public InvalidCredentialsException() {
+    }
+
+    public InvalidCredentialsException(String message) {
+        super(message);
+    }
+
+    public InvalidCredentialsException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public InvalidCredentialsException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/exceptions/UserMigratedException.java b/src/main/java/org/spigotmc/authlib/exceptions/UserMigratedException.java
new file mode 100644
index 0000000..1df195f
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/exceptions/UserMigratedException.java
@@ -0,0 +1,18 @@
+package org.spigotmc.authlib.exceptions;
+
+public class UserMigratedException extends InvalidCredentialsException {
+    public UserMigratedException() {
+    }
+
+    public UserMigratedException(String message) {
+        super(message);
+    }
+
+    public UserMigratedException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public UserMigratedException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/legacy/LegacyAuthenticationService.java b/src/main/java/org/spigotmc/authlib/legacy/LegacyAuthenticationService.java
new file mode 100644
index 0000000..1be0c80
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/legacy/LegacyAuthenticationService.java
@@ -0,0 +1,49 @@
+package org.spigotmc.authlib.legacy;
+
+import org.spigotmc.authlib.Agent;
+import org.spigotmc.authlib.GameProfileRepository;
+import org.spigotmc.authlib.HttpAuthenticationService;
+import org.apache.commons.lang3.Validate;
+import org.spigotmc.authlib.legacy.LegacyUserAuthentication;
+
+import java.net.Proxy;
+
+public class LegacyAuthenticationService extends HttpAuthenticationService {
+    /**
+     * Constructs a new AuthenticationService using the legacy service.
+     * <p />
+     * The legacy authentication service only supports the Minecraft {@link Agent}.
+     *
+     * @param proxy Proxy to route all HTTP(s) requests through.
+     * @throws java.lang.IllegalArgumentException Proxy is null
+     */
+    protected LegacyAuthenticationService(Proxy proxy) {
+        super(proxy);
+    }
+
+    /**
+     * Creates a relevant {@link org.spigotmc.authlib.UserAuthentication} using the legacy servers.
+     * <p />
+     * The legacy authentication service only supports the Minecraft {@link Agent}.
+     *
+     * @param agent Game agent to authenticate for
+     * @throws java.lang.IllegalArgumentException Agent is null or not allowed for this AuthenticationService
+     * @return New user authenticator
+     */
+    @Override
+    public LegacyUserAuthentication createUserAuthentication(Agent agent) {
+        Validate.notNull(agent);
+        if (agent != Agent.MINECRAFT) throw new IllegalArgumentException("Legacy authentication cannot handle anything but Minecraft");
+        return new LegacyUserAuthentication(this);
+    }
+
+    @Override
+    public LegacyMinecraftSessionService createMinecraftSessionService() {
+        return new LegacyMinecraftSessionService(this);
+    }
+
+    @Override
+    public GameProfileRepository createProfileRepository() {
+        throw new UnsupportedOperationException("Legacy authentication service has no profile repository");
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/legacy/LegacyMinecraftSessionService.java b/src/main/java/org/spigotmc/authlib/legacy/LegacyMinecraftSessionService.java
new file mode 100644
index 0000000..6ed1afe
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/legacy/LegacyMinecraftSessionService.java
@@ -0,0 +1,79 @@
+package org.spigotmc.authlib.legacy;
+
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.exceptions.AuthenticationUnavailableException;
+import org.spigotmc.authlib.minecraft.HttpMinecraftSessionService;
+import org.spigotmc.authlib.minecraft.MinecraftProfileTexture;
+import org.spigotmc.authlib.legacy.LegacyAuthenticationService;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.spigotmc.authlib.HttpAuthenticationService.*;
+
+public class LegacyMinecraftSessionService extends HttpMinecraftSessionService {
+    private static final String BASE_URL = "http://session.minecraft.net/game/";
+    private static final URL JOIN_URL = constantURL(BASE_URL + "joinserver.jsp");
+    private static final URL CHECK_URL = constantURL(BASE_URL + "checkserver.jsp");
+
+    protected LegacyMinecraftSessionService(LegacyAuthenticationService authenticationService) {
+        super(authenticationService);
+    }
+
+    @Override
+    public void joinServer(GameProfile profile, String authenticationToken, String serverId) throws AuthenticationException {
+        Map<String, Object> arguments = new HashMap<String, Object>();
+
+        arguments.put("user", profile.getName());
+        arguments.put("sessionId", authenticationToken);
+        arguments.put("serverId", serverId);
+
+        URL url = concatenateURL(JOIN_URL, buildQuery(arguments));
+
+        try {
+            String response = getAuthenticationService().performGetRequest(url);
+
+            if (!response.equals("OK")) {
+                throw new AuthenticationException(response);
+            }
+        } catch (IOException e) {
+            throw new AuthenticationUnavailableException(e);
+        }
+    }
+
+    @Override
+    public GameProfile hasJoinedServer(GameProfile user, String serverId) throws AuthenticationUnavailableException {
+        Map<String, Object> arguments = new HashMap<String, Object>();
+
+        arguments.put("user", user.getName());
+        arguments.put("serverId", serverId);
+
+        URL url = concatenateURL(CHECK_URL, buildQuery(arguments));
+
+        try {
+            String response = getAuthenticationService().performGetRequest(url);
+
+            return response.equals("YES") ? user : null;
+        } catch (IOException e) {
+            throw new AuthenticationUnavailableException(e);
+        }
+    }
+
+    @Override
+    public Map<MinecraftProfileTexture.Type, MinecraftProfileTexture> getTextures(GameProfile profile, boolean requireSecure) {
+        return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+    }
+
+    @Override
+    public GameProfile fillProfileProperties(GameProfile profile) {
+        return profile;
+    }
+
+    @Override
+    public LegacyAuthenticationService getAuthenticationService() {
+        return (LegacyAuthenticationService) super.getAuthenticationService();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/legacy/LegacyUserAuthentication.java b/src/main/java/org/spigotmc/authlib/legacy/LegacyUserAuthentication.java
new file mode 100644
index 0000000..0dc670a
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/legacy/LegacyUserAuthentication.java
@@ -0,0 +1,117 @@
+package org.spigotmc.authlib.legacy;
+
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.HttpAuthenticationService;
+import org.spigotmc.authlib.HttpUserAuthentication;
+import org.spigotmc.authlib.UserType;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.exceptions.InvalidCredentialsException;
+import org.spigotmc.authlib.util.UUIDTypeAdapter;
+import org.apache.commons.lang3.StringUtils;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+public class LegacyUserAuthentication extends HttpUserAuthentication {
+    private static final URL AUTHENTICATION_URL = HttpAuthenticationService.constantURL("https://login.minecraft.net");
+    private static final int AUTHENTICATION_VERSION = 14;
+
+    // 0          1          2            3          4
+    // deprecated,deprecated,profile name,session id,profile id
+    private static final int RESPONSE_PART_PROFILE_NAME = 2;
+    private static final int RESPONSE_PART_SESSION_TOKEN = 3;
+    private static final int RESPONSE_PART_PROFILE_ID = 4;
+
+    private String sessionToken;
+
+    protected LegacyUserAuthentication(LegacyAuthenticationService authenticationService) {
+        super(authenticationService);
+    }
+
+    @Override
+    public void logIn() throws AuthenticationException {
+        if (StringUtils.isBlank(getUsername())) {
+            throw new InvalidCredentialsException("Invalid username");
+        }
+        if (StringUtils.isBlank(getPassword())) {
+            throw new InvalidCredentialsException("Invalid password");
+        }
+
+        Map<String, Object> args = new HashMap<String, Object>();
+        args.put("user", getUsername());
+        args.put("password", getPassword());
+        args.put("version", AUTHENTICATION_VERSION);
+        String response;
+
+        try {
+            response = getAuthenticationService().performPostRequest(AUTHENTICATION_URL, HttpAuthenticationService.buildQuery(args), "application/x-www-form-urlencoded").trim();
+        } catch (IOException e) {
+            throw new AuthenticationException("Authentication server is not responding", e);
+        }
+
+        String[] split = response.split(":");
+
+        if (split.length == 5) {
+            String profileId = split[RESPONSE_PART_PROFILE_ID];
+            String profileName = split[RESPONSE_PART_PROFILE_NAME];
+            String sessionToken = split[RESPONSE_PART_SESSION_TOKEN];
+
+            if (StringUtils.isBlank(profileId) || StringUtils.isBlank(profileName) || StringUtils.isBlank(sessionToken)) {
+                throw new AuthenticationException("Unknown response from authentication server: " + response);
+            }
+
+            setSelectedProfile(new GameProfile(UUIDTypeAdapter.fromString(profileId), profileName));
+            this.sessionToken = sessionToken;
+            setUserType(UserType.LEGACY);
+        } else {
+            throw new InvalidCredentialsException(response);
+        }
+    }
+
+    @Override
+    public void logOut() {
+        super.logOut();
+        sessionToken = null;
+    }
+
+    @Override
+    public boolean canPlayOnline() {
+        return isLoggedIn() && getSelectedProfile() != null && getAuthenticatedToken() != null;
+    }
+
+    @Override
+    public GameProfile[] getAvailableProfiles() {
+        if (getSelectedProfile() != null) {
+            return new GameProfile[] {getSelectedProfile()};
+        } else {
+            return new GameProfile[0];
+        }
+    }
+
+    /**
+     * This method is not supported in the Legacy authentication service.
+     * <p />
+     * Attempts to call this method will fail.
+     */
+    @Override
+    public void selectGameProfile(GameProfile profile) throws AuthenticationException {
+        throw new UnsupportedOperationException("Game profiles cannot be changed in the legacy authentication service");
+    }
+
+    @Override
+    public String getAuthenticatedToken() {
+        return sessionToken;
+    }
+
+    @Override
+    public String getUserID() {
+        return getUsername();
+    }
+
+    @Override
+    public LegacyAuthenticationService getAuthenticationService() {
+        return (LegacyAuthenticationService) super.getAuthenticationService();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/minecraft/BaseMinecraftSessionService.java b/src/main/java/org/spigotmc/authlib/minecraft/BaseMinecraftSessionService.java
new file mode 100644
index 0000000..000ce45
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/minecraft/BaseMinecraftSessionService.java
@@ -0,0 +1,17 @@
+package org.spigotmc.authlib.minecraft;
+
+import org.spigotmc.authlib.AuthenticationService;
+import org.spigotmc.authlib.minecraft.MinecraftSessionService;
+
+public abstract class BaseMinecraftSessionService implements MinecraftSessionService
+{
+    private final AuthenticationService authenticationService;
+
+    protected BaseMinecraftSessionService(AuthenticationService authenticationService) {
+        this.authenticationService = authenticationService;
+    }
+
+    public AuthenticationService getAuthenticationService() {
+        return authenticationService;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/minecraft/HttpMinecraftSessionService.java b/src/main/java/org/spigotmc/authlib/minecraft/HttpMinecraftSessionService.java
new file mode 100644
index 0000000..a3dc46b
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/minecraft/HttpMinecraftSessionService.java
@@ -0,0 +1,16 @@
+package org.spigotmc.authlib.minecraft;
+
+import org.spigotmc.authlib.HttpAuthenticationService;
+import org.spigotmc.authlib.minecraft.BaseMinecraftSessionService;
+
+public abstract class HttpMinecraftSessionService extends BaseMinecraftSessionService
+{
+    protected HttpMinecraftSessionService(HttpAuthenticationService authenticationService) {
+        super(authenticationService);
+    }
+
+    @Override
+    public HttpAuthenticationService getAuthenticationService() {
+        return (HttpAuthenticationService) super.getAuthenticationService();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/minecraft/MinecraftProfileTexture.java b/src/main/java/org/spigotmc/authlib/minecraft/MinecraftProfileTexture.java
new file mode 100644
index 0000000..110f826
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/minecraft/MinecraftProfileTexture.java
@@ -0,0 +1,34 @@
+package org.spigotmc.authlib.minecraft;
+
+import org.apache.commons.io.FilenameUtils;
+import org.apache.commons.lang3.builder.ToStringBuilder;
+
+public class MinecraftProfileTexture {
+    public enum Type {
+        SKIN,
+        CAPE,
+        ;
+    }
+
+    private final String url;
+
+    public MinecraftProfileTexture(String url) {
+        this.url = url;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public String getHash() {
+        return FilenameUtils.getBaseName(url);
+    }
+
+    @Override
+    public String toString() {
+        return new ToStringBuilder(this)
+                .append("url", url)
+                .append("hash", getHash())
+                .toString();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/minecraft/MinecraftSessionService.java b/src/main/java/org/spigotmc/authlib/minecraft/MinecraftSessionService.java
new file mode 100644
index 0000000..0166693
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/minecraft/MinecraftSessionService.java
@@ -0,0 +1,60 @@
+package org.spigotmc.authlib.minecraft;
+
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.exceptions.AuthenticationUnavailableException;
+import org.spigotmc.authlib.minecraft.MinecraftProfileTexture;
+
+import java.util.Map;
+
+public interface MinecraftSessionService {
+    /**
+     * Attempts to join the specified Minecraft server.
+     * <p />
+     * The {@link org.spigotmc.authlib.GameProfile} used to join with may be partial, but the exact requirements will vary on
+     * authentication service. If this method returns without throwing an exception, the join was successful and a subsequent call to
+     * {@link #hasJoinedServer(org.spigotmc.authlib.GameProfile, String)} will return true.
+     *
+     * @param profile Partial {@link org.spigotmc.authlib.GameProfile} to join as
+     * @param authenticationToken The {@link org.spigotmc.authlib.UserAuthentication#getAuthenticatedToken() authenticated token} of the user
+     * @param serverId The random ID of the server to join
+     * @throws org.spigotmc.authlib.exceptions.AuthenticationUnavailableException Thrown when the servers return a malformed response, or are otherwise unavailable
+     * @throws org.spigotmc.authlib.exceptions.InvalidCredentialsException Thrown when the specified authenticationToken is invalid
+     * @throws org.spigotmc.authlib.exceptions.AuthenticationException Generic exception indicating that we could not authenticate the user
+     */
+    public void joinServer(GameProfile profile, String authenticationToken, String serverId) throws AuthenticationException;
+
+    /**
+     * Checks if the specified user has joined a Minecraft server.
+     * <p />
+     * The {@link org.spigotmc.authlib.GameProfile} used to join with may be partial, but the exact requirements will vary on
+     * authentication service.
+     *
+     * @param user Partial {@link org.spigotmc.authlib.GameProfile} to check for
+     * @param serverId The random ID of the server to check for
+     * @throws org.spigotmc.authlib.exceptions.AuthenticationUnavailableException Thrown when the servers return a malformed response, or are otherwise unavailable
+     * @return Full game profile if the user had joined, otherwise null
+     */
+    public GameProfile hasJoinedServer(GameProfile user, String serverId) throws AuthenticationUnavailableException;
+
+    /**
+     * Gets a map of all known textures from a {@link org.spigotmc.authlib.GameProfile}.
+     * <p />
+     * If a profile contains invalid textures, they will not be returned. If a profile contains no textures, an empty map will be returned.
+     *
+     * @param profile Game profile to return textures from.
+     * @param requireSecure If true, requires the payload to be recent and securely fetched.
+     * @return Map of texture types to textures.
+     */
+    public Map<MinecraftProfileTexture.Type, MinecraftProfileTexture> getTextures(GameProfile profile, boolean requireSecure);
+
+    /**
+     * Fills a profile with all known properties from the session service.
+     * <p />
+     * The profile must have an ID. If no information is found, nothing will be done.
+     *
+     * @param profile Game profile to fill with properties.
+     * @return Filled profile for the previous user.
+     */
+    public GameProfile fillProfileProperties(GameProfile profile);
+}
diff --git a/src/main/java/org/spigotmc/authlib/properties/Property.java b/src/main/java/org/spigotmc/authlib/properties/Property.java
new file mode 100644
index 0000000..6b8609b
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/properties/Property.java
@@ -0,0 +1,53 @@
+package org.spigotmc.authlib.properties;
+
+import org.apache.commons.codec.binary.Base64;
+
+import java.security.*;
+
+public class Property {
+    private final String name;
+    private final String value;
+    private final String signature;
+
+    public Property(String value, String name) {
+        this(value, name, null);
+    }
+
+    public Property(String name, String value, String signature) {
+        this.name = name;
+        this.value = value;
+        this.signature = signature;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public String getSignature() {
+        return signature;
+    }
+
+    public boolean hasSignature() {
+        return signature != null;
+    }
+
+    public boolean isSignatureValid(PublicKey publicKey) {
+        try {
+            Signature signature = Signature.getInstance("SHA1withRSA");
+            signature.initVerify(publicKey);
+            signature.update(value.getBytes());
+            return signature.verify(Base64.decodeBase64(this.signature));
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        } catch (InvalidKeyException e) {
+            e.printStackTrace();
+        } catch (SignatureException e) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/properties/PropertyMap.java b/src/main/java/org/spigotmc/authlib/properties/PropertyMap.java
new file mode 100644
index 0000000..ef27ad0
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/properties/PropertyMap.java
@@ -0,0 +1,73 @@
+package org.spigotmc.authlib.properties;
+
+import com.google.common.collect.ForwardingMultimap;
+import com.google.common.collect.LinkedHashMultimap;
+import com.google.common.collect.Multimap;
+import com.google.gson.*;
+
+import java.lang.reflect.Type;
+import java.util.Map;
+
+public class PropertyMap extends ForwardingMultimap<String, Property> {
+    private final Multimap<String, Property> properties = LinkedHashMultimap.create();
+
+    @Override
+    protected Multimap<String, Property> delegate() {
+        return properties;
+    }
+
+    public static class Serializer implements JsonSerializer<PropertyMap>, JsonDeserializer<PropertyMap> {
+        @Override
+        public PropertyMap deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+            final PropertyMap result = new PropertyMap();
+
+            if (json instanceof JsonObject) {
+                JsonObject object = (JsonObject) json;
+
+                for (Map.Entry<String, JsonElement> entry : object.entrySet()) {
+                    if (entry.getValue() instanceof JsonArray) {
+                        for (JsonElement element : ((JsonArray) entry.getValue())) {
+                            result.put(entry.getKey(), new Property(entry.getKey(), element.getAsString()));
+                        }
+                    }
+                }
+            } else if (json instanceof JsonArray) {
+                for (JsonElement element : (JsonArray) json) {
+                    if (element instanceof JsonObject) {
+                        JsonObject object = (JsonObject) element;
+                        String name = object.getAsJsonPrimitive("name").getAsString();
+                        String value = object.getAsJsonPrimitive("value").getAsString();
+
+                        if (object.has("signature")) {
+                            result.put(name, new Property(name, value, object.getAsJsonPrimitive("signature").getAsString()));
+                        } else {
+                            result.put(name, new Property(name, value));
+                        }
+                    }
+                }
+            }
+
+            return result;
+        }
+
+        @Override
+        public JsonElement serialize(PropertyMap src, Type typeOfSrc, JsonSerializationContext context) {
+            JsonArray result = new JsonArray();
+
+            for (Property property : src.values()) {
+                JsonObject object = new JsonObject();
+
+                object.addProperty("name", property.getName());
+                object.addProperty("value", property.getValue());
+
+                if (property.hasSignature()) {
+                    object.addProperty("signature", property.getSignature());
+                }
+
+                result.add(object);
+            }
+
+            return result;
+        }
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/util/UUIDTypeAdapter.java b/src/main/java/org/spigotmc/authlib/util/UUIDTypeAdapter.java
new file mode 100644
index 0000000..8c3516d
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/util/UUIDTypeAdapter.java
@@ -0,0 +1,28 @@
+package org.spigotmc.authlib.util;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+
+import java.io.IOException;
+import java.util.UUID;
+
+public class UUIDTypeAdapter extends TypeAdapter<UUID> {
+    @Override
+    public void write(JsonWriter out, UUID value) throws IOException {
+        out.value(fromUUID(value));
+    }
+
+    @Override
+    public UUID read(JsonReader in) throws IOException {
+        return fromString(in.nextString());
+    }
+
+    public static String fromUUID(UUID value) {
+        return value.toString().replace("-", "");
+    }
+
+    public static UUID fromString(String input) {
+        return UUID.fromString(input.replaceFirst("(\\w{8})(\\w{4})(\\w{4})(\\w{4})(\\w{12})", "$1-$2-$3-$4-$5"));
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/ProfileIncompleteException.java b/src/main/java/org/spigotmc/authlib/yggdrasil/ProfileIncompleteException.java
new file mode 100644
index 0000000..125916a
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/ProfileIncompleteException.java
@@ -0,0 +1,18 @@
+package org.spigotmc.authlib.yggdrasil;
+
+public class ProfileIncompleteException extends RuntimeException {
+    public ProfileIncompleteException() {
+    }
+
+    public ProfileIncompleteException(String message) {
+        super(message);
+    }
+
+    public ProfileIncompleteException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ProfileIncompleteException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/ProfileNotFoundException.java b/src/main/java/org/spigotmc/authlib/yggdrasil/ProfileNotFoundException.java
new file mode 100644
index 0000000..66ba35e
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/ProfileNotFoundException.java
@@ -0,0 +1,18 @@
+package org.spigotmc.authlib.yggdrasil;
+
+public class ProfileNotFoundException extends RuntimeException {
+    public ProfileNotFoundException() {
+    }
+
+    public ProfileNotFoundException(String message) {
+        super(message);
+    }
+
+    public ProfileNotFoundException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public ProfileNotFoundException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilAuthenticationService.java b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilAuthenticationService.java
new file mode 100644
index 0000000..b4c1a6b
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilAuthenticationService.java
@@ -0,0 +1,99 @@
+package org.spigotmc.authlib.yggdrasil;
+
+import com.google.gson.*;
+import org.spigotmc.authlib.*;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.exceptions.AuthenticationUnavailableException;
+import org.spigotmc.authlib.exceptions.InvalidCredentialsException;
+import org.spigotmc.authlib.exceptions.UserMigratedException;
+import org.spigotmc.authlib.minecraft.MinecraftSessionService;
+import org.spigotmc.authlib.properties.PropertyMap;
+import org.spigotmc.authlib.yggdrasil.YggdrasilUserAuthentication;
+import org.spigotmc.authlib.yggdrasil.response.Response;
+import org.spigotmc.authlib.util.UUIDTypeAdapter;
+import org.apache.commons.lang3.StringUtils;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+import java.net.Proxy;
+import java.net.URL;
+import java.util.UUID;
+
+public class YggdrasilAuthenticationService extends HttpAuthenticationService {
+    private final String clientToken;
+    private final Gson gson;
+
+    public YggdrasilAuthenticationService(Proxy proxy, String clientToken) {
+        super(proxy);
+        this.clientToken = clientToken;
+        GsonBuilder builder = new GsonBuilder();
+        builder.registerTypeAdapter(GameProfile.class, new GameProfileSerializer());
+        builder.registerTypeAdapter(PropertyMap.class, new PropertyMap.Serializer());
+        builder.registerTypeAdapter(UUID.class, new UUIDTypeAdapter());
+        gson = builder.create();
+    }
+
+    @Override
+    public UserAuthentication createUserAuthentication(Agent agent) {
+        return new YggdrasilUserAuthentication(this, agent);
+    }
+
+    @Override
+    public MinecraftSessionService createMinecraftSessionService() {
+        return new YggdrasilMinecraftSessionService(this);
+    }
+
+    @Override
+    public GameProfileRepository createProfileRepository() {
+        return new YggdrasilGameProfileRepository(this);
+    }
+
+    protected <T extends Response> T makeRequest(URL url, Object input, Class<T> classOfT) throws AuthenticationException {
+        try {
+            String jsonResult = input == null ? performGetRequest(url) : performPostRequest(url, gson.toJson(input), "application/json");
+            T result = gson.fromJson(jsonResult, classOfT);
+
+            if (result == null) return null;
+
+            if (StringUtils.isNotBlank(result.getError())) {
+                if ("UserMigratedException".equals(result.getCause())) {
+                    throw new UserMigratedException(result.getErrorMessage());
+                } else if (result.getError().equals("ForbiddenOperationException")) {
+                    throw new InvalidCredentialsException(result.getErrorMessage());
+                } else {
+                    throw new AuthenticationException(result.getErrorMessage());
+                }
+            }
+
+            return result;
+        } catch (IOException e) {
+            throw new AuthenticationUnavailableException("Cannot contact authentication server", e);
+        } catch (IllegalStateException e) {
+            throw new AuthenticationUnavailableException("Cannot contact authentication server", e);
+        } catch (JsonParseException e) {
+            throw new AuthenticationUnavailableException("Cannot contact authentication server", e);
+        }
+    }
+
+    public String getClientToken() {
+        return clientToken;
+    }
+
+    private static class GameProfileSerializer implements JsonSerializer<GameProfile>, JsonDeserializer<GameProfile> {
+        @Override
+        public GameProfile deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+            JsonObject object = (JsonObject) json;
+            UUID id = object.has("id") ? context.<UUID>deserialize(object.get("id"), UUID.class) : null;
+            String name = object.has("name") ? object.getAsJsonPrimitive("name").getAsString() : null;
+            return new GameProfile(id, name);
+        }
+
+        @Override
+        public JsonElement serialize(GameProfile src, Type typeOfSrc, JsonSerializationContext context) {
+            JsonObject result = new JsonObject();
+            if (src.getId() != null) result.add("id", context.serialize(src.getId()));
+            if (src.getName() != null) result.addProperty("name", src.getName());
+            return result;
+        }
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilGameProfileRepository.java b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilGameProfileRepository.java
new file mode 100644
index 0000000..0fc52cc
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilGameProfileRepository.java
@@ -0,0 +1,136 @@
+package org.spigotmc.authlib.yggdrasil;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.Sets;
+import org.spigotmc.authlib.*;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.yggdrasil.ProfileNotFoundException;
+import org.spigotmc.authlib.yggdrasil.YggdrasilAuthenticationService;
+import org.spigotmc.authlib.yggdrasil.response.ProfileSearchResultsResponse;
+import org.apache.commons.lang3.builder.ToStringBuilder;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.Set;
+
+public class YggdrasilGameProfileRepository implements GameProfileRepository {
+    private static final Logger LOGGER = LogManager.getLogger();
+    private static final String BASE_URL = "https://api.mojang.com/";
+    private static final String SEARCH_PAGE_URL = BASE_URL + "profiles/page/";
+    private static final int MAX_FAIL_COUNT = 3;
+    private static final int DELAY_BETWEEN_PAGES = 100;
+    private static final int DELAY_BETWEEN_FAILURES = 750;
+
+    private final YggdrasilAuthenticationService authenticationService;
+
+    public YggdrasilGameProfileRepository(YggdrasilAuthenticationService authenticationService) {
+        this.authenticationService = authenticationService;
+    }
+
+    @Override
+    public void findProfilesByNames(String[] names, Agent agent, ProfileLookupCallback callback) {
+        Set<ProfileCriteria> criteria = Sets.newHashSet();
+
+        for (String name : names) {
+            if (!Strings.isNullOrEmpty(name)) {
+                criteria.add(new ProfileCriteria(name, agent));
+            }
+        }
+
+        Exception exception = null;
+        Set<ProfileCriteria> request = Sets.newHashSet(criteria);
+        int page = 1;
+        int failCount = 0;
+
+        while (!criteria.isEmpty()) {
+            try {
+                ProfileSearchResultsResponse response = authenticationService.makeRequest(HttpAuthenticationService.constantURL(SEARCH_PAGE_URL + page), request, ProfileSearchResultsResponse.class);
+                failCount = 0;
+                exception = null;
+
+                if (response.getSize() == 0 || response.getProfiles().length == 0) {
+                    LOGGER.debug("Page {} returned empty, aborting search", page);
+                    break;
+                } else {
+                    LOGGER.debug("Page {} returned {} results of {}, parsing", page, response.getProfiles().length, response.getSize());
+
+                    for (GameProfile profile : response.getProfiles()) {
+                        LOGGER.debug("Successfully looked up profile {}", profile);
+                        criteria.remove(new ProfileCriteria(profile.getName(), agent));
+                        callback.onProfileLookupSucceeded(profile);
+                    }
+
+                    LOGGER.debug("Page {} successfully parsed", page);
+                    page++;
+
+                    try {
+                        Thread.sleep(DELAY_BETWEEN_PAGES);
+                    } catch (InterruptedException ignored) {}
+                }
+            } catch (AuthenticationException e) {
+                exception = e;
+                failCount++;
+
+                if (failCount == MAX_FAIL_COUNT) {
+                    break;
+                } else {
+                    try {
+                        Thread.sleep(DELAY_BETWEEN_FAILURES);
+                    } catch (InterruptedException ignored) {}
+                }
+            }
+        }
+
+        if (criteria.isEmpty()) {
+            LOGGER.debug("Successfully found every profile requested");
+        } else {
+            LOGGER.debug("{} profiles were missing from search results", criteria.size());
+            if (exception == null) {
+                exception = new ProfileNotFoundException("Server did not find the requested profile");
+            }
+            for (ProfileCriteria profileCriteria : criteria) {
+                callback.onProfileLookupFailed(new GameProfile(null, profileCriteria.getName()), exception);
+            }
+        }
+    }
+
+    private class ProfileCriteria {
+        private final String name;
+        private final String agent;
+
+        private ProfileCriteria(String name, Agent agent) {
+            this.name = name;
+            this.agent = agent.getName();
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public String getAgent() {
+            return agent;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            ProfileCriteria that = (ProfileCriteria) o;
+            return agent.equals(that.agent) && name.toLowerCase().equals(that.name.toLowerCase());
+        }
+
+        @Override
+        public int hashCode() {
+            return 31 * name.toLowerCase().hashCode() + agent.hashCode();
+        }
+
+        @Override
+        public String toString() {
+            return new ToStringBuilder(this)
+                    .append("agent", agent)
+                    .append("name", name)
+                    .toString();
+        }
+    }
+
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilMinecraftSessionService.java b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilMinecraftSessionService.java
new file mode 100644
index 0000000..dc2a6f8
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilMinecraftSessionService.java
@@ -0,0 +1,177 @@
+package org.spigotmc.authlib.yggdrasil;
+
+import com.google.common.collect.Iterables;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonParseException;
+import net.minecraft.util.org.apache.commons.io.Charsets;
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.HttpAuthenticationService;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.exceptions.AuthenticationUnavailableException;
+import org.spigotmc.authlib.minecraft.HttpMinecraftSessionService;
+import org.spigotmc.authlib.minecraft.MinecraftProfileTexture;
+import org.spigotmc.authlib.properties.Property;
+import org.spigotmc.authlib.yggdrasil.YggdrasilAuthenticationService;
+import org.spigotmc.authlib.yggdrasil.request.JoinMinecraftServerRequest;
+import org.spigotmc.authlib.yggdrasil.response.HasJoinedMinecraftServerResponse;
+import org.spigotmc.authlib.yggdrasil.response.MinecraftProfilePropertiesResponse;
+import org.spigotmc.authlib.yggdrasil.response.MinecraftTexturesPayload;
+import org.spigotmc.authlib.yggdrasil.response.Response;
+import org.spigotmc.authlib.util.UUIDTypeAdapter;
+import org.apache.commons.codec.binary.Base64;
+import org.apache.commons.io.IOUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.net.URL;
+import java.security.KeyFactory;
+import java.security.PublicKey;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.*;
+
+public class YggdrasilMinecraftSessionService extends HttpMinecraftSessionService {
+    private static final Logger LOGGER = LogManager.getLogger();
+    private static final String BASE_URL = "https://sessionserver.mojang.com/session/minecraft/";
+    private static final URL JOIN_URL = HttpAuthenticationService.constantURL(BASE_URL + "join");
+    private static final URL CHECK_URL = HttpAuthenticationService.constantURL(BASE_URL + "hasJoined");
+
+    private final PublicKey publicKey;
+    private final Gson gson = new GsonBuilder().registerTypeAdapter(UUID.class, new UUIDTypeAdapter()).create();
+
+    protected YggdrasilMinecraftSessionService(YggdrasilAuthenticationService authenticationService) {
+        super(authenticationService);
+
+        try {
+            X509EncodedKeySpec spec = new X509EncodedKeySpec(IOUtils.toByteArray(YggdrasilMinecraftSessionService.class.getResourceAsStream("/yggdrasil_session_pubkey.der")));
+            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
+            publicKey = keyFactory.generatePublic(spec);
+        } catch (Exception e) {
+            throw new Error("Missing/invalid yggdrasil public key!");
+        }
+    }
+
+    @Override
+    public void joinServer(GameProfile profile, String authenticationToken, String serverId) throws AuthenticationException {
+        JoinMinecraftServerRequest request = new JoinMinecraftServerRequest();
+        request.accessToken = authenticationToken;
+        request.selectedProfile = profile.getId();
+        request.serverId = serverId;
+
+        getAuthenticationService().makeRequest(JOIN_URL, request, Response.class);
+    }
+
+    @Override
+    public GameProfile hasJoinedServer(GameProfile user, String serverId) throws AuthenticationUnavailableException {
+        Map<String, Object> arguments = new HashMap<String, Object>();
+
+        arguments.put("username", user.getName());
+        arguments.put("serverId", serverId);
+
+        URL url = HttpAuthenticationService.concatenateURL(CHECK_URL, HttpAuthenticationService.buildQuery(arguments));
+
+        try {
+            HasJoinedMinecraftServerResponse response = getAuthenticationService().makeRequest(url, null, HasJoinedMinecraftServerResponse.class);
+
+            if (response != null && response.getId() != null) {
+                GameProfile result = new GameProfile(response.getId(), user.getName());
+
+                if (response.getProperties() != null) {
+                    result.getProperties().putAll(response.getProperties());
+                }
+
+                return result;
+            } else {
+                return null;
+            }
+        } catch (AuthenticationUnavailableException e) {
+            throw e;
+        } catch (AuthenticationException e) {
+            return null;
+        }
+    }
+
+    @Override
+    public Map<MinecraftProfileTexture.Type, MinecraftProfileTexture> getTextures(GameProfile profile, boolean requireSecure) {
+        Property textureProperty = Iterables.getFirst(profile.getProperties().get("textures"), null);
+        if (textureProperty == null) return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+
+        if (!textureProperty.hasSignature()) {
+            LOGGER.error("Signature is missing from textures payload");
+            return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+        }
+
+        if (!textureProperty.isSignatureValid(publicKey)) {
+            LOGGER.error("Textures payload has been tampered with (signature invalid)");
+            return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+        }
+
+        MinecraftTexturesPayload result;
+        try {
+            String json = new String(Base64.decodeBase64(textureProperty.getValue()), Charsets.UTF_8);
+            result = gson.fromJson(json, MinecraftTexturesPayload.class);
+        } catch (JsonParseException e) {
+            LOGGER.error("Could not decode textures payload", e);
+            return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+        }
+
+        if (result.getProfileId() == null || !result.getProfileId().equals(profile.getId())) {
+            LOGGER.error("Decrypted textures payload was for another user (expected id {} but was for {})", profile.getId(), result.getProfileId());
+            return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+        }
+
+        if (result.getProfileName() == null || !result.getProfileName().equals(profile.getName())) {
+            LOGGER.error("Decrypted textures payload was for another user (expected name {} but was for {})", profile.getName(), result.getProfileName());
+            return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+        }
+
+        if (requireSecure) {
+            if (result.isPublic()) {
+                LOGGER.error("Decrypted textures payload was public but we require secure data");
+                return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+            }
+
+            Calendar limit = Calendar.getInstance();
+            limit.add(Calendar.DATE, -1);
+            Date validFrom = new Date(result.getTimestamp());
+
+            if (validFrom.before(limit.getTime())) {
+                LOGGER.error("Decrypted textures payload is too old ({0}, but we need it to be at least {1})", validFrom, limit);
+                return new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>();
+            }
+        }
+
+        return result.getTextures() == null ? new HashMap<MinecraftProfileTexture.Type, MinecraftProfileTexture>() : result.getTextures();
+    }
+
+    @Override
+    public GameProfile fillProfileProperties(GameProfile profile) {
+        if (profile.getId() == null) {
+            return profile;
+        }
+
+        try {
+            URL url = HttpAuthenticationService.constantURL(BASE_URL + "profile/" + UUIDTypeAdapter.fromUUID(profile.getId()));
+            MinecraftProfilePropertiesResponse response = getAuthenticationService().makeRequest(url, null, MinecraftProfilePropertiesResponse.class);
+
+            if (response == null) {
+                LOGGER.debug("Couldn't fetch profile properties for " + profile + " as the profile does not exist");
+                return profile;
+            } else {
+                LOGGER.debug("Successfully fetched profile properties for " + profile);
+                GameProfile result = new GameProfile(response.getId(), response.getName());
+                result.getProperties().putAll(response.getProperties());
+                profile.getProperties().putAll(response.getProperties());
+                return result;
+            }
+        } catch (AuthenticationException e) {
+            LOGGER.warn("Couldn't look up profile properties for " + profile, e);
+            return profile;
+        }
+    }
+
+    @Override
+    public YggdrasilAuthenticationService getAuthenticationService() {
+        return (YggdrasilAuthenticationService) super.getAuthenticationService();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilUserAuthentication.java b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilUserAuthentication.java
new file mode 100644
index 0000000..d1b3183
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/YggdrasilUserAuthentication.java
@@ -0,0 +1,257 @@
+package org.spigotmc.authlib.yggdrasil;
+
+import org.spigotmc.authlib.*;
+import org.spigotmc.authlib.exceptions.AuthenticationException;
+import org.spigotmc.authlib.exceptions.InvalidCredentialsException;
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.yggdrasil.request.AuthenticationRequest;
+import org.spigotmc.authlib.yggdrasil.request.RefreshRequest;
+import org.spigotmc.authlib.yggdrasil.response.AuthenticationResponse;
+import org.spigotmc.authlib.yggdrasil.response.RefreshResponse;
+import org.spigotmc.authlib.yggdrasil.response.User;
+import org.apache.commons.lang3.ArrayUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.net.URL;
+import java.util.*;
+
+public class YggdrasilUserAuthentication extends HttpUserAuthentication {
+    private static final Logger LOGGER = LogManager.getLogger();
+    private static final String BASE_URL = "https://authserver.mojang.com/";
+    private static final URL ROUTE_AUTHENTICATE = HttpAuthenticationService.constantURL(BASE_URL + "authenticate");
+    private static final URL ROUTE_REFRESH = HttpAuthenticationService.constantURL(BASE_URL + "refresh");
+    private static final URL ROUTE_VALIDATE = HttpAuthenticationService.constantURL(BASE_URL + "validate");
+    private static final URL ROUTE_INVALIDATE = HttpAuthenticationService.constantURL(BASE_URL + "invalidate");
+    private static final URL ROUTE_SIGNOUT = HttpAuthenticationService.constantURL(BASE_URL + "signout");
+
+    private static final String STORAGE_KEY_ACCESS_TOKEN = "accessToken";
+
+    private final Agent agent;
+    private GameProfile[] profiles;
+    private String accessToken;
+    private boolean isOnline;
+
+    public YggdrasilUserAuthentication(YggdrasilAuthenticationService authenticationService, Agent agent) {
+        super(authenticationService);
+        this.agent = agent;
+    }
+
+    @Override
+    public boolean canLogIn() {
+        return !canPlayOnline() && StringUtils.isNotBlank(getUsername()) && (StringUtils.isNotBlank(getPassword()) || StringUtils.isNotBlank(getAuthenticatedToken()));
+    }
+
+    @Override
+    public void logIn() throws AuthenticationException {
+        if (StringUtils.isBlank(getUsername())) {
+            throw new InvalidCredentialsException("Invalid username");
+        }
+
+        if (StringUtils.isNotBlank(getAuthenticatedToken())) {
+            logInWithToken();
+        } else if (StringUtils.isNotBlank(getPassword())) {
+            logInWithPassword();
+        } else {
+            throw new InvalidCredentialsException("Invalid password");
+        }
+    }
+
+    protected void logInWithPassword() throws AuthenticationException {
+        if (StringUtils.isBlank(getUsername())) {
+            throw new InvalidCredentialsException("Invalid username");
+        }
+        if (StringUtils.isBlank(getPassword())) {
+            throw new InvalidCredentialsException("Invalid password");
+        }
+
+        LOGGER.info("Logging in with username & password");
+
+        AuthenticationRequest request = new AuthenticationRequest(this, getUsername(), getPassword());
+        AuthenticationResponse response = getAuthenticationService().makeRequest(ROUTE_AUTHENTICATE, request, AuthenticationResponse.class);
+
+        if (!response.getClientToken().equals(getAuthenticationService().getClientToken())) {
+            throw new AuthenticationException("Server requested we change our client token. Don't know how to handle this!");
+        }
+
+        if (response.getSelectedProfile() != null) {
+            setUserType(response.getSelectedProfile().isLegacy() ? UserType.LEGACY : UserType.MOJANG);
+        } else if (ArrayUtils.isNotEmpty(response.getAvailableProfiles())) {
+            setUserType(response.getAvailableProfiles()[0].isLegacy() ? UserType.LEGACY : UserType.MOJANG);
+        }
+
+        User user = response.getUser();
+
+        if (user != null && user.getId() != null) {
+            setUserid(user.getId());
+        } else {
+            setUserid(getUsername());
+        }
+
+        isOnline = true;
+        accessToken = response.getAccessToken();
+        profiles = response.getAvailableProfiles();
+        setSelectedProfile(response.getSelectedProfile());
+        getModifiableUserProperties().clear();
+
+        updateUserProperties(user);
+    }
+
+    protected void updateUserProperties(User user) {
+        if (user == null) return;
+
+        if (user.getProperties() != null) {
+            getModifiableUserProperties().putAll(user.getProperties());
+        }
+    }
+
+    protected void logInWithToken() throws AuthenticationException {
+        if (StringUtils.isBlank(getUserID())) {
+            if (StringUtils.isBlank(getUsername())) {
+                setUserid(getUsername());
+            } else {
+                throw new InvalidCredentialsException("Invalid uuid & username");
+            }
+        }
+        if (StringUtils.isBlank(getAuthenticatedToken())) {
+            throw new InvalidCredentialsException("Invalid access token");
+        }
+
+        LOGGER.info("Logging in with access token");
+
+        RefreshRequest request = new RefreshRequest(this);
+        RefreshResponse response = getAuthenticationService().makeRequest(ROUTE_REFRESH, request, RefreshResponse.class);
+
+        if (!response.getClientToken().equals(getAuthenticationService().getClientToken())) {
+            throw new AuthenticationException("Server requested we change our client token. Don't know how to handle this!");
+        }
+
+        if (response.getSelectedProfile() != null) {
+            setUserType(response.getSelectedProfile().isLegacy() ? UserType.LEGACY : UserType.MOJANG);
+        } else if (ArrayUtils.isNotEmpty(response.getAvailableProfiles())) {
+            setUserType(response.getAvailableProfiles()[0].isLegacy() ? UserType.LEGACY : UserType.MOJANG);
+        }
+
+        if (response.getUser() != null && response.getUser().getId() != null) {
+            setUserid(response.getUser().getId());
+        } else {
+            setUserid(getUsername());
+        }
+
+        isOnline = true;
+        accessToken = response.getAccessToken();
+        profiles = response.getAvailableProfiles();
+        setSelectedProfile(response.getSelectedProfile());
+        getModifiableUserProperties().clear();
+
+        updateUserProperties(response.getUser());
+    }
+
+    @Override
+    public void logOut() {
+        super.logOut();
+
+        accessToken = null;
+        profiles = null;
+        isOnline = false;
+    }
+
+    @Override
+    public GameProfile[] getAvailableProfiles() {
+        return profiles;
+    }
+
+    @Override
+    public boolean isLoggedIn() {
+        return StringUtils.isNotBlank(accessToken);
+    }
+
+    @Override
+    public boolean canPlayOnline() {
+        return isLoggedIn() && getSelectedProfile() != null && isOnline;
+    }
+
+    @Override
+    public void selectGameProfile(GameProfile profile) throws AuthenticationException {
+        if (!isLoggedIn()) {
+            throw new AuthenticationException("Cannot change game profile whilst not logged in");
+        }
+        if (getSelectedProfile() != null) {
+            throw new AuthenticationException("Cannot change game profile. You must log out and back in.");
+        }
+        if (profile == null || !ArrayUtils.contains(profiles, profile)) {
+            throw new IllegalArgumentException("Invalid profile '" + profile + "'");
+        }
+
+        RefreshRequest request = new RefreshRequest(this, profile);
+        RefreshResponse response = getAuthenticationService().makeRequest(ROUTE_REFRESH, request, RefreshResponse.class);
+
+        if (!response.getClientToken().equals(getAuthenticationService().getClientToken())) {
+            throw new AuthenticationException("Server requested we change our client token. Don't know how to handle this!");
+        }
+
+        isOnline = true;
+        accessToken = response.getAccessToken();
+        setSelectedProfile(response.getSelectedProfile());
+    }
+
+    @Override
+    public void loadFromStorage(Map<String, Object> credentials) {
+        super.loadFromStorage(credentials);
+
+        accessToken = String.valueOf(credentials.get(STORAGE_KEY_ACCESS_TOKEN));
+    }
+
+    @Override
+    public Map<String, Object> saveForStorage() {
+        Map<String, Object> result = super.saveForStorage();
+
+        if (StringUtils.isNotBlank(getAuthenticatedToken())) {
+            result.put(STORAGE_KEY_ACCESS_TOKEN, getAuthenticatedToken());
+        }
+
+        return result;
+    }
+
+    /**
+     * @deprecated
+     */
+    @Deprecated
+    public String getSessionToken() {
+        if (isLoggedIn() && getSelectedProfile() != null && canPlayOnline()) {
+            return String.format("token:%s:%s", getAuthenticatedToken(), getSelectedProfile().getId());
+        } else {
+            return null;
+        }
+    }
+
+    @Override
+    public String getAuthenticatedToken() {
+        return accessToken;
+    }
+
+    public Agent getAgent() {
+        return agent;
+    }
+
+    @Override
+    public String toString() {
+        return "YggdrasilAuthenticationService{" +
+                "agent=" + agent +
+                ", profiles=" + Arrays.toString(profiles) +
+                ", selectedProfile=" + getSelectedProfile() +
+                ", username='" + getUsername() + '\''+
+                ", isLoggedIn=" + isLoggedIn() +
+                ", userType=" + getUserType() +
+                ", canPlayOnline=" + canPlayOnline() +
+                ", accessToken='" + accessToken + '\'' +
+                ", clientToken='" + getAuthenticationService().getClientToken() + '\'' +
+                '}';
+    }
+
+    @Override
+    public YggdrasilAuthenticationService getAuthenticationService() {
+        return (YggdrasilAuthenticationService) super.getAuthenticationService();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/request/AuthenticationRequest.java b/src/main/java/org/spigotmc/authlib/yggdrasil/request/AuthenticationRequest.java
new file mode 100644
index 0000000..f0457a4
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/request/AuthenticationRequest.java
@@ -0,0 +1,19 @@
+package org.spigotmc.authlib.yggdrasil.request;
+
+import org.spigotmc.authlib.Agent;
+import org.spigotmc.authlib.yggdrasil.YggdrasilUserAuthentication;
+
+public class AuthenticationRequest {
+    private Agent agent;
+    private String username;
+    private String password;
+    private String clientToken;
+    private boolean requestUser = true;
+
+    public AuthenticationRequest(YggdrasilUserAuthentication authenticationService, String username, String password) {
+        this.agent = authenticationService.getAgent();
+        this.username = username;
+        this.clientToken = authenticationService.getAuthenticationService().getClientToken();
+        this.password = password;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/request/InvalidateRequest.java b/src/main/java/org/spigotmc/authlib/yggdrasil/request/InvalidateRequest.java
new file mode 100644
index 0000000..75ee0f3
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/request/InvalidateRequest.java
@@ -0,0 +1,13 @@
+package org.spigotmc.authlib.yggdrasil.request;
+
+import org.spigotmc.authlib.yggdrasil.YggdrasilUserAuthentication;
+
+public class InvalidateRequest {
+    private String accessToken;
+    private String clientToken;
+
+    public InvalidateRequest(YggdrasilUserAuthentication authenticationService) {
+        this.accessToken = authenticationService.getAuthenticatedToken();
+        this.clientToken = authenticationService.getAuthenticationService().getClientToken();
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/request/JoinMinecraftServerRequest.java b/src/main/java/org/spigotmc/authlib/yggdrasil/request/JoinMinecraftServerRequest.java
new file mode 100644
index 0000000..a9ff35c
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/request/JoinMinecraftServerRequest.java
@@ -0,0 +1,9 @@
+package org.spigotmc.authlib.yggdrasil.request;
+
+import java.util.UUID;
+
+public class JoinMinecraftServerRequest {
+    public String accessToken;
+    public UUID selectedProfile;
+    public String serverId;
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/request/RefreshRequest.java b/src/main/java/org/spigotmc/authlib/yggdrasil/request/RefreshRequest.java
new file mode 100644
index 0000000..4f52290
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/request/RefreshRequest.java
@@ -0,0 +1,21 @@
+package org.spigotmc.authlib.yggdrasil.request;
+
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.yggdrasil.YggdrasilUserAuthentication;
+
+public class RefreshRequest {
+    private String clientToken;
+    private String accessToken;
+    private GameProfile selectedProfile;
+    private boolean requestUser = true;
+
+    public RefreshRequest(YggdrasilUserAuthentication authenticationService) {
+        this(authenticationService, null);
+    }
+
+    public RefreshRequest(YggdrasilUserAuthentication authenticationService, GameProfile profile) {
+        this.clientToken = authenticationService.getAuthenticationService().getClientToken();
+        this.accessToken = authenticationService.getAuthenticatedToken();
+        this.selectedProfile = profile;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/AuthenticationResponse.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/AuthenticationResponse.java
new file mode 100644
index 0000000..0a03b1b
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/AuthenticationResponse.java
@@ -0,0 +1,35 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.yggdrasil.response.Response;
+import org.spigotmc.authlib.yggdrasil.response.User;
+
+public class AuthenticationResponse extends Response
+{
+    private String accessToken;
+    private String clientToken;
+    private GameProfile selectedProfile;
+    private GameProfile[] availableProfiles;
+    private User user;
+
+    public String getAccessToken() {
+        return accessToken;
+    }
+
+    public String getClientToken() {
+        return clientToken;
+    }
+
+    public GameProfile[] getAvailableProfiles() {
+        return availableProfiles;
+    }
+
+    public GameProfile getSelectedProfile() {
+        return selectedProfile;
+    }
+
+    public User getUser() {
+        return user;
+    }
+
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/HasJoinedMinecraftServerResponse.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/HasJoinedMinecraftServerResponse.java
new file mode 100644
index 0000000..f93acf0
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/HasJoinedMinecraftServerResponse.java
@@ -0,0 +1,20 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+import org.spigotmc.authlib.properties.PropertyMap;
+import org.spigotmc.authlib.yggdrasil.response.Response;
+
+import java.util.UUID;
+
+public class HasJoinedMinecraftServerResponse extends Response
+{
+    private UUID id;
+    private PropertyMap properties;
+
+    public UUID getId() {
+        return id;
+    }
+
+    public PropertyMap getProperties() {
+        return properties;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/MinecraftProfilePropertiesResponse.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/MinecraftProfilePropertiesResponse.java
new file mode 100644
index 0000000..4cf76e5
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/MinecraftProfilePropertiesResponse.java
@@ -0,0 +1,25 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+import org.spigotmc.authlib.properties.PropertyMap;
+import org.spigotmc.authlib.yggdrasil.response.Response;
+
+import java.util.UUID;
+
+public class MinecraftProfilePropertiesResponse extends Response
+{
+    private UUID id;
+    private String name;
+    private PropertyMap properties;
+
+    public UUID getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public PropertyMap getProperties() {
+        return properties;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/MinecraftTexturesPayload.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/MinecraftTexturesPayload.java
new file mode 100644
index 0000000..72293ce
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/MinecraftTexturesPayload.java
@@ -0,0 +1,34 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+import org.spigotmc.authlib.minecraft.MinecraftProfileTexture;
+
+import java.util.Map;
+import java.util.UUID;
+
+public class MinecraftTexturesPayload {
+    private long timestamp;
+    private UUID profileId;
+    private String profileName;
+    private boolean isPublic;
+    private Map<MinecraftProfileTexture.Type, MinecraftProfileTexture> textures;
+
+    public long getTimestamp() {
+        return timestamp;
+    }
+
+    public UUID getProfileId() {
+        return profileId;
+    }
+
+    public String getProfileName() {
+        return profileName;
+    }
+
+    public boolean isPublic() {
+        return isPublic;
+    }
+
+    public Map<MinecraftProfileTexture.Type, MinecraftProfileTexture> getTextures() {
+        return textures;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/ProfileSearchResultsResponse.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/ProfileSearchResultsResponse.java
new file mode 100644
index 0000000..2c10758
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/ProfileSearchResultsResponse.java
@@ -0,0 +1,18 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.yggdrasil.response.Response;
+
+public class ProfileSearchResultsResponse extends Response
+{
+    private GameProfile[] profiles;
+    private int size;
+
+    public GameProfile[] getProfiles() {
+        return profiles;
+    }
+
+    public int getSize() {
+        return size;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/RefreshResponse.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/RefreshResponse.java
new file mode 100644
index 0000000..d64667b
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/RefreshResponse.java
@@ -0,0 +1,34 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+import org.spigotmc.authlib.GameProfile;
+import org.spigotmc.authlib.yggdrasil.response.Response;
+import org.spigotmc.authlib.yggdrasil.response.User;
+
+public class RefreshResponse extends Response
+{
+    private String accessToken;
+    private String clientToken;
+    private GameProfile selectedProfile;
+    private GameProfile[] availableProfiles;
+    private User user;
+
+    public String getAccessToken() {
+        return accessToken;
+    }
+
+    public String getClientToken() {
+        return clientToken;
+    }
+
+    public GameProfile[] getAvailableProfiles() {
+        return availableProfiles;
+    }
+
+    public GameProfile getSelectedProfile() {
+        return selectedProfile;
+    }
+
+    public User getUser() {
+        return user;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/Response.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/Response.java
new file mode 100644
index 0000000..73c9da8
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/Response.java
@@ -0,0 +1,19 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+public class Response {
+    private String error;
+    private String errorMessage;
+    private String cause;
+
+    public String getError() {
+        return error;
+    }
+
+    public String getCause() {
+        return cause;
+    }
+
+    public String getErrorMessage() {
+        return errorMessage;
+    }
+}
diff --git a/src/main/java/org/spigotmc/authlib/yggdrasil/response/User.java b/src/main/java/org/spigotmc/authlib/yggdrasil/response/User.java
new file mode 100644
index 0000000..e4893fd
--- /dev/null
+++ b/src/main/java/org/spigotmc/authlib/yggdrasil/response/User.java
@@ -0,0 +1,16 @@
+package org.spigotmc.authlib.yggdrasil.response;
+
+import org.spigotmc.authlib.properties.PropertyMap;
+
+public class User {
+    private String id;
+    private PropertyMap properties;
+
+    public String getId() {
+        return id;
+    }
+
+    public PropertyMap getProperties() {
+        return properties;
+    }
+}
diff --git a/src/main/resources/yggdrasil_session_pubkey.der b/src/main/resources/yggdrasil_session_pubkey.der
new file mode 100644
index 0000000000000000000000000000000000000000..9c79a3aa4771da1f15af37a2af0898f878ad816f
GIT binary patch
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literal 0
HcmV?d00001

-- 
1.8.5.2.msysgit.0