Create login handler

src/main/java/baritone/bot/IBaritoneUser.java

@@ -20,6 +20,7 @@ package baritone.bot;
 import baritone.bot.entity.EntityBot;
 import net.minecraft.client.entity.EntityOtherPlayerMP;
 import net.minecraft.network.NetworkManager;
+import net.minecraft.util.Session;
 import net.minecraft.world.World;
 
 import javax.annotation.Nullable;
@@ -47,4 +48,12 @@ public interface IBaritoneUser {
      * @return The remote entity for this bot
      */
     EntityOtherPlayerMP getRemoteEntity();
+
+    /**
+     * Returns the user login session. Should never be {@code null}, as this should be set when the
+     * user is constructed.
+     *
+     * @return The bot's login session
+     */
+    Session getSession();
 }

src/main/java/baritone/bot/handler/BotNetHandlerLoginClient.java

@@ -0,0 +1,118 @@
+/*
+ * This file is part of Baritone.
+ *
+ * Baritone is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Baritone is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Baritone.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package baritone.bot.handler;
+
+import baritone.bot.IBaritoneUser;
+import com.mojang.authlib.GameProfile;
+import com.mojang.authlib.exceptions.AuthenticationException;
+import com.mojang.authlib.exceptions.AuthenticationUnavailableException;
+import com.mojang.authlib.exceptions.InvalidCredentialsException;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.network.NetHandlerLoginClient;
+import net.minecraft.network.EnumConnectionState;
+import net.minecraft.network.NetworkManager;
+import net.minecraft.network.login.client.CPacketEncryptionResponse;
+import net.minecraft.network.login.server.SPacketEncryptionRequest;
+import net.minecraft.network.login.server.SPacketLoginSuccess;
+import net.minecraft.util.CryptManager;
+import net.minecraft.util.text.ITextComponent;
+import net.minecraft.util.text.TextComponentTranslation;
+
+import javax.annotation.Nonnull;
+import javax.crypto.SecretKey;
+import java.math.BigInteger;
+import java.security.PublicKey;
+
+/**
+ * Handles the login stage when connecting to a server.
+ *
+ * @author Brady
+ * @since 10/29/2018
+ */
+public class BotNetHandlerLoginClient extends NetHandlerLoginClient {
+
+    /**
+     * The {@link NetworkManager} that is managing the connection with the server.
+     */
+    private final NetworkManager networkManager;
+
+    /**
+     * The {@link Minecraft} game instance
+     */
+    private final Minecraft mc;
+
+    /**
+     * The bot of this connection
+     */
+    private final IBaritoneUser user;
+
+    public BotNetHandlerLoginClient(NetworkManager networkManager, IBaritoneUser user) {
+        super(networkManager, Minecraft.getMinecraft(), null);
+        this.networkManager = networkManager;
+        this.mc = Minecraft.getMinecraft();
+        this.user = user;
+    }
+
+    @Override
+    public void handleEncryptionRequest(SPacketEncryptionRequest packetIn) {
+        SecretKey secretkey = CryptManager.createNewSharedKey();
+        PublicKey publicKey = packetIn.getPublicKey();
+
+        // Setup joinServer payload info
+        GameProfile profile = this.user.getSession().getProfile();
+        String authenticationToken = this.user.getSession().getToken();
+        String serverId = new BigInteger(CryptManager.getServerIdHash(packetIn.getServerId(), publicKey, secretkey)).toString(16);
+
+        if (this.mc.getCurrentServerData() != null && this.mc.getCurrentServerData().isOnLAN()) {
+            try {
+                this.mc.getSessionService().joinServer(profile, authenticationToken, serverId);
+            } catch (AuthenticationException e) {
+                // Couldn't connect to auth servers but will continue to join LAN
+            }
+        } else {
+            try {
+                this.mc.getSessionService().joinServer(profile, authenticationToken, serverId);
+            } catch (AuthenticationUnavailableException e) {
+                this.networkManager.closeChannel(new TextComponentTranslation("disconnect.loginFailedInfo", new TextComponentTranslation("disconnect.loginFailedInfo.serversUnavailable")));
+                return;
+            } catch (InvalidCredentialsException e) {
+                this.networkManager.closeChannel(new TextComponentTranslation("disconnect.loginFailedInfo", new TextComponentTranslation("disconnect.loginFailedInfo.invalidSession")));
+                return;
+            } catch (AuthenticationException e) {
+                this.networkManager.closeChannel(new TextComponentTranslation("disconnect.loginFailedInfo", e.getMessage()));
+                return;
+            }
+        }
+
+        // noinspection unchecked
+        this.networkManager.sendPacket(new CPacketEncryptionResponse(secretkey, publicKey, packetIn.getVerifyToken()),
+                future -> BotNetHandlerLoginClient.this.networkManager.enableEncryption(secretkey));
+    }
+
+    @Override
+    public void handleLoginSuccess(SPacketLoginSuccess packetIn) {
+        this.networkManager.setConnectionState(EnumConnectionState.PLAY);
+        this.networkManager.setNetHandler(new BotNetHandlerPlayClient(this.networkManager, this.user, Minecraft.getMinecraft(), packetIn.getProfile()));
+    }
+
+    @Override
+    public void onDisconnect(@Nonnull ITextComponent reason) {
+        // TODO Notify the bot manager that we are no longer connected
+        // It's important that we don't call the superclass method because that would mess up GUIs and make us upset
+    }
+}

src/main/java/baritone/bot/handler/BotNetHandlerPlayClient.java

@@ -15,12 +15,15 @@
  * along with Baritone.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-package baritone.bot.net;
+package baritone.bot.handler;
 
 import baritone.bot.IBaritoneUser;
 import baritone.bot.entity.EntityBot;
+import com.mojang.authlib.GameProfile;
 import net.minecraft.client.Minecraft;
+import net.minecraft.client.entity.EntityPlayerSP;
 import net.minecraft.client.multiplayer.WorldClient;
+import net.minecraft.client.network.NetHandlerPlayClient;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.player.InventoryPlayer;
@@ -33,7 +36,6 @@ import net.minecraft.network.play.client.CPacketResourcePackStatus;
 import net.minecraft.network.play.server.*;
 import net.minecraft.util.IThreadListener;
 import net.minecraft.util.text.ITextComponent;
-import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
 
@@ -43,16 +45,23 @@ import javax.annotation.Nonnull;
 //   - For other things, we'll actually need the system
 
 /**
+ * This class would effectively operate the same if we directly implemented {@link INetHandlerPlayClient},
+ * however, the {@link EntityPlayerSP} constructor requires an actual implementation of
+ * {@link NetHandlerPlayClient} in order to access the {@link GameProfile}.
+ *
  * @author Brady
  * @since 10/22/2018
  */
-public class BotNetHandlerPlayClient implements INetHandlerPlayClient {
+public class BotNetHandlerPlayClient extends NetHandlerPlayClient {
 
+    /**
+     * The {@link NetworkManager} that is managing the connection with the server.
+     */
     private final NetworkManager networkManager;
 
     /**
      * This is the {@link Minecraft} game instance, however, to prevent unwanted references
-     * to the game instance fields, we refer to it as a {@link IThreadListener}
+     * to the game instance fields, we refer to it as a {@link IThreadListener}.
      */
     private final IThreadListener client;
 
@@ -71,7 +80,9 @@ public class BotNetHandlerPlayClient implements INetHandlerPlayClient {
      */
     private WorldClient world;
 
-    public BotNetHandlerPlayClient(NetworkManager networkManager, IThreadListener client, IBaritoneUser user) {
+    public BotNetHandlerPlayClient(NetworkManager networkManager, IBaritoneUser user, Minecraft client, GameProfile profile) {
+        // noinspection ConstantConditions
+        super(client, null, networkManager, profile);
         this.networkManager = networkManager;
         this.client = client;
         this.user = user;
@@ -485,6 +496,6 @@ public class BotNetHandlerPlayClient implements INetHandlerPlayClient {
 
     @Override
     public void onDisconnect(@Nonnull ITextComponent reason) {
-        /* Unload the world and notify the bot manager that we are no longer connected */
+        // TODO Unload the world and notify the bot manager that we are no longer connected
     }
 }