hook multi dex variant of android packers

hook_multidex.js

// https://cryptax.medium.com/multidex-trick-to-unpack-android-bianlian-ed52eb791e56
// https://android.googlesource.com/platform/frameworks/multidex/+/refs/heads/master/library/src/androidx/multidex/MultiDex.java#716
// https://android.googlesource.com/platform/libcore/+/master/dalvik/src/main/java/dalvik/system/DexPathList.java#397
// copy file works reeeealy slow, sorry for that. Instead you can hook file.delete since multidex will remove temp dexes.
//  https://android.googlesource.com/platform/frameworks/multidex/+/refs/heads/master/library/src/androidx/multidex/MultiDexExtractor.java#418
Java.deoptimizeBootImage()
Java.deoptimizeEverything()

function copyFile(destPath,sourcePath){
    const File = Java.use('java.io.File');
    const FileInputStream = Java.use('java.io.FileInputStream');
    const FileOutputStream = Java.use('java.io.FileOutputStream');
    const BufferedInputStream = Java.use('java.io.BufferedInputStream');
    const BufferedOutputStream = Java.use('java.io.BufferedOutputStream');
    var sourceFile = File.$new.overload('java.lang.String').call(File, sourcePath);
    if (sourceFile.exists() && sourceFile.canRead()) {
        var destinationFile = File.$new.overload('java.lang.String').call(File, destPath);
        destinationFile.createNewFile();
        var fileInputStream = FileInputStream.$new.overload('java.io.File').call(FileInputStream, sourceFile);
        var fileOutputStream = FileOutputStream.$new.overload('java.io.File').call(FileOutputStream, destinationFile);
        var bufferedInputStream = BufferedInputStream.$new.overload('java.io.InputStream').call(BufferedInputStream, fileInputStream);
        var bufferedOutputStream = BufferedOutputStream.$new.overload('java.io.OutputStream').call(BufferedOutputStream, fileOutputStream);
        var data = 0;
        while ((data = bufferedInputStream.read()) != -1) {
            bufferedOutputStream.write(data);
            // console.log('buffuredInputStream : ' + data);
        }
        bufferedInputStream.close();
        fileInputStream.close();
        bufferedOutputStream.close();
        fileOutputStream.close();
    }
    else {
        console.log('Error : File cannot read.')
    }
}

Java.perform(function(){

    var dexpathlist = Java.use("dalvik.system.DexPathList")
    dexpathlist.loadDexFile.implementation = function(file,dir,loader,elements){
        // https://android.googlesource.com/platform/libcore/+/master/dalvik/src/main/java/dalvik/system/DexPathList.java#397
        console.log("loaddexfile ")
        console.log(file.getAbsolutePath())
        copyFile("/data/local/tmp/"+file.getName(),file.getAbsolutePath())
        return this.loadDexFile(file,dir,loader,elements)
    }

    dexpathlist.makeDexElements.overload('java.util.List', 'java.io.File', 'java.util.List', 'java.lang.ClassLoader').implementation = function(a,b,c,d){
        // https://android.googlesource.com/platform/frameworks/multidex/+/refs/heads/master/library/src/androidx/multidex/MultiDex.java#716
        // console.log("called makeDexElements")
        // for(var i=0;i<a.size();i++){
        //     // copyFile("/data/local/tmp/test",a.get(i).toString())
        //     console.log("adding dex element "  + a.get(i))
        // }
        return this.makeDexElements(a,b,c,d)
    }

})