Add the current files and make a README.md for those who are not coming from the tutorial or want to build this themselves

src/main/java/net/x3f200c/pala4linux/launcherpatch/LauncherPatch.java

@@ -0,0 +1,37 @@
+package net.x3f200c.pala4linux.launcherpatch;
+
+import java.lang.instrument.Instrumentation;
+import java.lang.instrument.UnmodifiableClassException;
+import java.lang.Class;
+import java.lang.String;
+import net.x3f200c.pala4linux.launcherpatch.LauncherPatcher;
+
+public class LauncherPatch {
+	public static void premain(String agentArgs, Instrumentation inst) {
+		patch(inst);
+	}
+	public static void agentmain(String agentArgs, Instrumentation inst) {
+		patch(inst);
+	}
+	public static void patch(Instrumentation inst) {
+		Class<?> routeHandlerClass = null;
+		ClassLoader routeHandlerClassLoader = null;
+
+		try {
+			routeHandlerClass = Class.forName("fr.paladium.router.route.common.CommonRoute");
+			routeHandlerClassLoader = routeHandlerClass.getClassLoader();
+		} catch(ClassNotFoundException e) {
+
+		}
+
+		LauncherPatcher dt = new LauncherPatcher(routeHandlerClass.getName(), routeHandlerClassLoader);
+
+		inst.addTransformer(dt, true);
+
+		try {
+			inst.retransformClasses(routeHandlerClass);
+		} catch(UnmodifiableClassException e) {
+
+		}
+	}
+}

src/main/java/net/x3f200c/pala4linux/launcherpatch/LauncherPatcher.java

@@ -0,0 +1,45 @@
+package net.x3f200c.pala4linux.launcherpatch;
+
+import java.lang.instrument.ClassFileTransformer;
+import java.io.IOException;
+import java.security.ProtectionDomain;
+import javassist.ClassPool;
+import javassist.CtClass;
+import javassist.CtMethod;
+import javassist.NotFoundException;
+import javassist.CannotCompileException;
+
+class LauncherPatcher implements ClassFileTransformer {
+	private final String targetClassName;
+
+	public LauncherPatcher(String className, ClassLoader classLoader) {
+        this.targetClassName = className;
+    }
+
+	@Override
+	public byte[] transform(ClassLoader loader, String className, Class<?> redefinedClass, ProtectionDomain protectionDomain, byte[] classBuffer) {
+		byte[] bytecode = classBuffer;
+
+		String finalTargetClassName = this.targetClassName.replaceAll("\\.", "/");
+        if (!className.equals(finalTargetClassName)) {
+            return bytecode;
+        }
+
+		if (className.equals(finalTargetClassName)) {
+			try {
+				ClassPool cp = ClassPool.getDefault();
+				CtClass crClass = cp.get("fr.paladium.router.route.common.CommonRoute");
+				CtMethod osGetterMethod = crClass.getDeclaredMethod("handleGetOS");
+
+				osGetterMethod.setBody("{ return fr.paladium.router.handler.CefRouteHandler.create().success(\"os\", \"windows\"); }");
+
+				bytecode = crClass.toBytecode();
+				crClass.detach();
+			} catch(NotFoundException | CannotCompileException | IOException e) {
+
+			}
+		}
+
+		return bytecode;
+	}
+}

src/main/resources/META-INF/MANIFEST.MF

@@ -0,0 +1,4 @@
+Agent-Class: net.x3f200c.pala4linux.launcherpatch.LauncherPatch
+Can-Redefine-Classes: true
+Can-Retransform-Classes: true
+Premain-Class: net.x3f200c.pala4linux.launcherpatch.LauncherPatch