Account Manager

package net.minecraft.client.gui;

import java.awt.Color;
import java.io.IOException;
import java.net.Proxy;

import org.lwjgl.input.Keyboard;

import com.mojang.authlib.Agent;
import com.mojang.authlib.exceptions.AuthenticationException;
import com.mojang.authlib.exceptions.AuthenticationUnavailableException;
import com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService;
import com.mojang.authlib.yggdrasil.YggdrasilUserAuthentication;

import net.minecraft.client.Minecraft;
import net.minecraft.util.Session;

public class GuiScreenAccount extends GuiScreen
{

    private GuiScreen parentScreen;
    private GuiTextField uTF;
    private GuiTextField pTF;
    private GuiTextField cTF;
    private String error;

    public GuiScreenAccount(GuiScreen arg1)
    {
        parentScreen = arg1;
    }

    @Override
    public void updateScreen()
    {
        uTF.updateCursorCounter();
        pTF.updateCursorCounter();
        cTF.updateCursorCounter();
    }

    protected void keyTyped(char c, int i)
    {
        uTF.textboxKeyTyped(c, i);
        pTF.textboxKeyTyped(c, i);
        cTF.textboxKeyTyped(c, i);

        if(c == '\t')
        {
            if(uTF.isFocused())
            {
                uTF.setFocused(false);
                pTF.setFocused(true);
            } else if (pTF.isFocused())
            {
                pTF.setFocused(false);
                cTF.setFocused(true);
            } else if (cTF.isFocused())
            {
                cTF.setFocused(false);
                uTF.setFocused(true);
            }
        }

        if(c == '\r')
        {
            actionPerformed((GuiButton)this.buttonList.get(0));
        }
    }

    protected void mouseClicked(int x, int y, int mb)
    {
        try
        {
            super.mouseClicked(x, y, mb);
        } catch (IOException e)
        {
            e.printStackTrace();
        }
        uTF.mouseClicked(x, y, mb);
        pTF.mouseClicked(x, y, mb);
        cTF.mouseClicked(x, y, mb);
    }

    public void initGui()
    {
        Keyboard.enableRepeatEvents(true);

        int i = 24;
        int j = this.height / 4 + 48;

        int locationFirst = j;
        int locationAddition = 48;

        this.buttonList.add(new GuiButton(0, width / 2 - 126, j + 72 + 12 + 45, 120, 20, "Login"));
        this.buttonList.add(new GuiButton(1, width / 2 + 7, j + 72 + 12 + 45, 120, 20, "Back"));

        uTF = new GuiTextField(0, fontRendererObj, width / 2 - 125, locationFirst, 250, 20);
        pTF = new GuiTextField(1, fontRendererObj, width / 2 - 125, locationFirst + locationAddition * 1, 250, 20);
        cTF = new GuiTextField(2, fontRendererObj, width / 2 - 125, locationFirst + locationAddition * 2, 250, 20);

        uTF.setMaxStringLength(100);
        pTF.setMaxStringLength(100);
        cTF.setMaxStringLength(200);
    }

    public void drawScreen(int x, int y, float ticks)
    {
        drawDefaultBackground();

        int i = 24;
        int j = this.height / 4 + 35;

        int locationFirst = j;
        int locationAddition = 48;

        drawString(fontRendererObj, "Username", width/2-125, locationFirst, 0xFFFFFF);
        drawString(fontRendererObj, "Password", width/2-125, locationFirst + locationAddition * 1, 0xFFFFFF);
        drawString(fontRendererObj, "Combo (User:Pass)", width/2-125, locationFirst + locationAddition * 2, 0xFFFFFF);
        uTF.drawTextBox();
        pTF.drawTextBox();
        cTF.drawTextBox();
        if(error != null)
        {
            drawString(fontRendererObj, error, width/2 - fontRendererObj.getStringWidth("\247cError: "+error)/2, j + 72 + 12 + 85, Color.YELLOW.getRGB());
            if(error.contains("Logged in as")) {
                mc.displayGuiScreen(new GuiMultiplayer(this));
            }
        }
        super.drawScreen(x, y, ticks);
    }

    public void onGuiClosed()
    {
        Keyboard.enableRepeatEvents(false);
    }

    protected void actionPerformed(GuiButton arg1)
    {
        if(!arg1.enabled)
        {
            return;
        }
        if(arg1.id == 1)
        {
            mc.displayGuiScreen(new GuiMultiplayer(this));
        }
        if(arg1.id == 0)
        {
            if((uTF.getText().length()>0) || ((cTF.getText().length()>2) && (cTF.getText().contains(":"))))
            {
                error = null;
                String username = uTF.getText();
                String password = pTF.getText();
                if(password == "" && cTF.getText().equals("")) {
                    changeCrackedName(username);
                    return;
                }

                if(!cTF.getText().equals(""))
                {
                    String[] combo = cTF.getText().split(":", 2);
                    try
                    {
                        username = combo[0];
                        password = combo[1];
                    } catch (ArrayIndexOutOfBoundsException e)
                    {
                        error = "Invalid Arguments!";
                    }
                }

                YggdrasilUserAuthentication auth =
                          (YggdrasilUserAuthentication)new YggdrasilAuthenticationService(
                          Proxy.NO_PROXY, "").createUserAuthentication(Agent.MINECRAFT);

                        auth.setUsername(username);
                        auth.setPassword(password);
                        try
                        {
                          auth.logIn();
                          mc.session =
                            new Session(auth.getSelectedProfile().getName(),
                            auth.getSelectedProfile().getId().toString(),
                            auth.getAuthenticatedToken(), "mojang");
//                        System.out.println(username);
//                        System.out.println(password);
                          error = "Logged in as: "+auth.getSelectedProfile().getName();
                        }
                        catch (AuthenticationUnavailableException e)
                        {
                          error = "Can not connect the mojang authentification Servers";
                        }
                        catch (AuthenticationException e)
                        {
                          e.printStackTrace();
                          if ((e.getMessage().contains("Invalid username or password.")) ||
                            (e.getMessage().toLowerCase().contains("account migrated"))) {
                            error = "Invalid Password";
                          }
                          error = "Can not connect the mojang authentification Servers";
                        }
                        catch (NullPointerException e) {}
                      }

            }else
            {
                error = "Invalid Password!";
            }
            if(error != null)
            {
                int i = 24;
                int j = this.height / 4 + 35;
                drawString(fontRendererObj, error, width/2 - fontRendererObj.getStringWidth("\247cError: "+error)/2, j + 72 + 12 + 85, Color.YELLOW.getRGB());
                if(error.contains("Logged in as")) {
                    mc.displayGuiScreen(new GuiMultiplayer(this));
                }
            }else
            {
                mc.displayGuiScreen(new GuiMultiplayer(this));
            }
        }


      private void changeCrackedName(String newName)
      {
        mc.session =
          new Session(newName, "", "", "mojang");
      }

}