Merge pull request #1067 from Scrumplex/classpath-epicness

Move classpath definition into NewLaunch itself

libraries/launcher/org/polymc/impl/OneSixLauncher.java

@@ -1,16 +1,53 @@
-/* Copyright 2012-2021 MultiMC Contributors
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
+ *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
  *
- * 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
+ *  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.
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *  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.
  *
- * 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.
+ *  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.polymc.impl;
@@ -24,6 +61,9 @@ import java.applet.Applet;
 import java.io.File;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Paths;
 import java.util.Collections;
 import java.util.List;
 import java.util.logging.Level;
@@ -37,6 +77,7 @@ public final class OneSixLauncher implements Launcher {
     private static final Logger LOGGER = Logger.getLogger("OneSixLauncher");
 
     // parameters, separated from ParamBucket
+    private final List<String> classPath;
     private final List<String> mcParams;
     private final List<String> traits;
     private final String appletClass;
@@ -53,11 +94,8 @@ public final class OneSixLauncher implements Launcher {
     private final String serverAddress;
     private final String serverPort;
 
-    private final ClassLoader classLoader;
-
     public OneSixLauncher(Parameters params) {
-        classLoader = ClassLoader.getSystemClassLoader();
-
+        classPath = params.allSafe("classPath", Collections.<String>emptyList());
         mcParams = params.allSafe("param", Collections.<String>emptyList());
         mainClass = params.firstSafe("mainClass", "net.minecraft.client.Minecraft");
         appletClass = params.firstSafe("appletClass", "net.minecraft.client.MinecraftApplet");
@@ -104,7 +142,7 @@ public final class OneSixLauncher implements Launcher {
         method.invoke(null, (Object) mcParams.toArray(new String[0]));
     }
 
-    private void legacyLaunch() throws Exception {
+    private void legacyLaunch(ClassLoader classLoader) throws Exception {
         // Get the Minecraft Class and set the base folder
         Class<?> minecraftClass = classLoader.loadClass(mainClass);
 
@@ -151,7 +189,7 @@ public final class OneSixLauncher implements Launcher {
         invokeMain(minecraftClass);
     }
 
-    private void launchWithMainClass() throws Exception {
+    private void launchWithMainClass(ClassLoader classLoader) throws Exception {
         // window size, title and state, onesix
 
         // FIXME: there is no good way to maximize the minecraft window in onesix.
@@ -177,12 +215,24 @@ public final class OneSixLauncher implements Launcher {
 
     @Override
     public void launch() throws Exception {
+        URL[] classPathURLs = new URL[classPath.size()];
+        for (int i = 0; i < classPath.size(); i++) {
+            File f = new File(classPath.get(i));
+            classPathURLs[i] = f.toURI().toURL();
+        }
+        // Some mod loaders (Fabric) read this property to determine the classpath.
+        String systemClassPath = System.getProperty("java.class.path");
+        systemClassPath += File.pathSeparator + String.join(File.pathSeparator, classPath);
+        System.setProperty("java.class.path", systemClassPath);
+
+        ClassLoader classLoader = new URLClassLoader(classPathURLs, getClass().getClassLoader());
+
         if (traits.contains("legacyLaunch") || traits.contains("alphaLaunch")) {
             // legacy launch uses the applet wrapper
-            legacyLaunch();
+            legacyLaunch(classLoader);
         } else {
             // normal launch just calls main()
-            launchWithMainClass();
+            launchWithMainClass(classLoader);
         }
     }