RSLoader.java

package us.brtm.client.loader;

import us.brtm.client.decrypter.Decrypter;

import javax.swing.*;
import java.applet.AppletContext;
import java.applet.AppletStub;
import java.awt.*;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.JarFile;

/**
 * @author pxpc2
 */
public class RSLoader extends JFrame implements AppletStub {
    private static final String URL = "http://world45.runescape.com/";
    public File runescapeJar = null;
    public JarFile jarFile = null;
    JLabel label = new JLabel();
    private Map<String, String> parameters = new HashMap<>();

    public RSLoader() {
        try {
            loadComponents();

            Decrypter decrypter = new Decrypter(this);
            Class<?> clazz = decrypter.getClass("client");
            BApplet applet = new BApplet(clazz);
            applet.setStub(this);
            applet.init();
            applet.start();

            getContentPane().removeAll();
            getContentPane().add(applet, BorderLayout.CENTER);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private void loadComponents() throws IOException {
        setVisible(true);
        setResizable(false);
        setSize(775, 590);
        setLocationRelativeTo(getOwner());
        setTitle("Runescape Client - pxpc2");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        getContentPane().setBackground(Color.BLACK);
        label.setForeground(Color.WHITE);
        label.setHorizontalAlignment(JLabel.CENTER);
        label.setFont(new Font("Arial", Font.BOLD, 12));
        getContentPane().add(label);
        label.setText("Preparing client");

        getParams(URL);
        download(URL + parameters.get("archive"));

        runescapeJar = new File("Runescape.jar");
        jarFile = new JarFile(runescapeJar);

        label.setText("Loading data");
        System.out.println("Runescape.jar obtained");
    }

    private void getParams(String url) {
        String[] VALUES = {"document.write", "<param name=\"", "\">'", "'", "\\(", "\\)", "\"", " ", ";", "value"};

        try (BufferedReader in = new BufferedReader(
                new InputStreamReader(new URL(url).openStream()))) {
            String line;
            for (String s : parameters.values()) {
                System.out.println(s);
            }
            while ((line = in.readLine()) != null) {
                if (line.contains("app") && line.contains("write")) {
                    parameters.put("<app", "");
                    parameters.put("let ", "");
                } else if (line.contains("document.write")) {
                    for (String s : VALUES) {
                        line = line.replaceAll(s, "");
                    }
                    String[] split = line.split("=");
                    if (split.length == 1) {
                        parameters.put(split[0], "");
                    } else if (split.length == 2) {
                        parameters.put(split[0], split[1]);
                    } else if (split.length == 3) {
                        parameters.put(split[0], split[1] + split[2]);
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void download(String url) {
        try (BufferedInputStream in = new BufferedInputStream(
                new URL(url).openStream())) {
            FileOutputStream fos = new FileOutputStream("Runescape.jar");
            BufferedOutputStream out = new BufferedOutputStream(fos, 1024);
            byte[] data = new byte[1024];
            int x;
            while ((x = in.read(data, 0, 1024)) >= 0) {
                out.write(data, 0, x);
            }
            in.close();
            out.close();
            getContentPane().repaint();
        } catch (Exception e) {
            System.out.println("Error downloading data!");
        }
    }

    public URL getDocumentBase() {
        try {
            return new URL(URL);
        } catch (MalformedURLException e) {
            return null;
        }
    }

    public URL getCodeBase() {
        try {
            return new URL(URL);
        } catch (MalformedURLException e) {
            return null;
        }
    }

    public String getParameter(String name) {
        return parameters.get(name);
    }

    public AppletContext getAppletContext() {
        return null;
    }

    public void appletResize(int width, int height) {

    }

}