pollymc/libraries/launcher/org/multimc/applet/LegacyFrame.java

package org.multimc.applet;/*
 * Copyright 2012-2021 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import net.minecraft.Launcher;

import javax.imageio.ImageIO;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

public final class LegacyFrame extends Frame {

    private static final Logger LOGGER = Logger.getLogger("LegacyFrame");

    private Launcher appletWrap;

    public LegacyFrame(String title) {
        super(title);

        try {
            setIconImage(ImageIO.read(new File("icon.png")));
        } catch (IOException e) {
            LOGGER.log(Level.WARNING, "Unable to read Minecraft icon!", e);
        }

        this.addWindowListener(new ForceExitHandler());
    }

    public void start (
        Applet mcApplet,
        String user,
        String session,
        int winSizeW,
        int winSizeH,
        boolean maximize,
        String serverAddress,
        String serverPort
    ) {
        try {
            appletWrap = new Launcher(mcApplet, new URL("http://www.minecraft.net/game"));
        } catch (MalformedURLException ignored) {}
        
        // Implements support for launching in to multiplayer on classic servers using a mpticket
        // file generated by an external program and stored in the instance's root folder.
        Path mpticketFile = Paths.get(System.getProperty("user.dir") + "/../mpticket");
        Path mpticketFileCorrupt = Paths.get(System.getProperty("user.dir") + "/../mpticket.corrupt");

        if (Files.exists(mpticketFile)) {
            try (Scanner fileScanner = new Scanner(
                    Files.newInputStream(mpticketFile),
                    StandardCharsets.US_ASCII.name()
            )) {
                String[] mpticketParams = new String[3];

                for (int i = 0; i < mpticketParams.length; i++) {
                    if (fileScanner.hasNextLine()) {
                        mpticketParams[i] = fileScanner.nextLine();
                    } else {
                        Files.move(
                                mpticketFile,
                                mpticketFileCorrupt,
                                StandardCopyOption.REPLACE_EXISTING
                        );

                        throw new IllegalArgumentException("Mpticket file is corrupted!");
                    }
                }

                Files.delete(mpticketFile);

                // Assumes parameters are valid and in the correct order
                appletWrap.setParameter("server", mpticketParams[0]);
                appletWrap.setParameter("port", mpticketParams[1]);
                appletWrap.setParameter("mppass", mpticketParams[2]);
            } catch (IOException e) {
                LOGGER.log(Level.WARNING, "Unable to read mpticket file!", e);
            }
        }

        if (serverAddress != null) {
            appletWrap.setParameter("server", serverAddress);
            appletWrap.setParameter("port", serverPort);
        }

        appletWrap.setParameter("username", user);
        appletWrap.setParameter("sessionid", session);
        appletWrap.setParameter("stand-alone", "true"); // Show the quit button.
        appletWrap.setParameter("haspaid", "true"); // Some old versions need this for world saves to work.
        appletWrap.setParameter("demo", "false");
        appletWrap.setParameter("fullscreen", "false");

        mcApplet.setStub(appletWrap);

        add(appletWrap);

        appletWrap.setPreferredSize(new Dimension(winSizeW, winSizeH));

        pack();

        setLocationRelativeTo(null);
        setResizable(true);

        if (maximize)
            this.setExtendedState(MAXIMIZED_BOTH);

        validate();

        appletWrap.init();
        appletWrap.start();

        setVisible(true);
    }

    private final class ForceExitHandler extends WindowAdapter {

        @Override
        public void windowClosing(WindowEvent e) {
            new Thread(() -> {
                try {
                    Thread.sleep(30000L);
                } catch (InterruptedException localInterruptedException) {
                    localInterruptedException.printStackTrace();
                }

                LOGGER.info("Forcing exit!");

                System.exit(0);
            }).start();

            if (appletWrap != null) {
                appletWrap.stop();
                appletWrap.destroy();
            }

            // old minecraft versions can hang without this >_<
            System.exit(0);
        }

    }

}