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// SPDX-License-Identifier: GPL-3.0-only
/*
* PolyMC - Minecraft Launcher
* Copyright (C) 2022 icelimetea <fr3shtea@outlook.com>
* Copyright (C) 2022 flow <flowlnlnln@gmail.com>
* Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
* Copyright (C) 2022 solonovamax <solonovamax@12oclockpoint.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program 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 General Public License for more details.
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give
* you permission to link this library with independent modules to
* produce an executable, regardless of the license terms of these
* independent modules, and to copy and distribute the resulting
* executable under terms of your choice, provided that you also meet,
* for each linked independent module, the terms and conditions of the
* license of that module. An independent module is a module which is
* not derived from or based on this library. If you modify this
* library, you may extend this exception to your version of the
* library, but you are not obliged to do so. If you do not wish to do
* so, delete this exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2013-2021 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.
*/
package org.prismlauncher.launcher.impl.legacy;
import org.prismlauncher.launcher.impl.AbstractLauncher;
import org.prismlauncher.utils.Parameters;
import java.applet.Applet;
import java.io.File;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Used to launch old versions that support applets.
*/
public final class LegacyLauncher extends AbstractLauncher {
private static final Logger LOGGER = Logger.getLogger("LegacyLauncher");
private final String user, session;
private final String title;
private final String appletClass;
private final boolean noApplet;
private final String cwd;
public LegacyLauncher(Parameters params) {
super(params);
user = params.getString("userName");
session = params.getString("sessionId");
title = params.getString("windowTitle", "Minecraft");
appletClass = params.getString("appletClass", "net.minecraft.client.MinecraftApplet");
List<String> traits = params.getList("traits", Collections.<String>emptyList());
noApplet = traits.contains("noapplet");
cwd = System.getProperty("user.dir");
}
@Override
public void launch() throws Throwable {
Class<?> main = loadMain();
Field gameDirField = getMinecraftGameDirField(main);
if (gameDirField == null) {
LOGGER.warning("Could not find Mineraft path field.");
} else {
gameDirField.setAccessible(true);
gameDirField.set(null, new File(cwd));
}
if (!noApplet) {
LOGGER.info("Launching with applet wrapper...");
try {
Class<?> appletClass = classLoader.loadClass(this.appletClass);
MethodHandle constructor = MethodHandles.lookup().findConstructor(appletClass, MethodType.methodType(void.class));
Applet applet = (Applet) constructor.invoke();
LegacyFrame window = new LegacyFrame(title, applet);
window.start(
user,
session,
width,
height,
maximize,
serverAddress,
serverPort,
mcParams.contains("--demo")
);
return;
} catch (Throwable e) {
LOGGER.log(Level.SEVERE, "Applet wrapper failed:", e);
LOGGER.warning("Falling back to using main class.");
}
}
invokeMain(main);
}
/**
* Finds a field that looks like a Minecraft base folder in a supplied class
* @param clazz the class to scan
* @return The found field.
*/
private static Field getMinecraftGameDirField(Class<?> clazz) {
// Field we're looking for is always
// private static File obfuscatedName = null;
for (Field field : clazz.getDeclaredFields()) {
// Has to be File
if (field.getType() != File.class)
continue;
// And Private Static.
if (!Modifier.isStatic(field.getModifiers()) || !Modifier.isPrivate(field.getModifiers()))
continue;
return field;
}
return null;
}
}
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