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I have been trying to obfuscate the code for a while by using react-native-obfuscating-transformer. Everything seems okay but when I check the bundle.js. I can't see any obfuscated code.

PS: Currently, I try only for IOS.

Here are my config files.

metro.config.js

module.exports = {
    transformer: {
        babelTransformerPath: require.resolve('./transformer'),
        getTransformOptions: async () => ({
            transform: {
                experimentalImportSupport: false,
                inlineRequires: false,
            },
        }),
    },
};

transformer.js

const obfuscatingTransformer = require('react-native-obfuscating-transformer');

module.exports = obfuscatingTransformer({
    upstreamTransformer: require('metro-react-native-babel-transformer'),
    enableInDevelopment: true,
    obfuscatorOptions: {
        pact: true,
        controlFlowFlattening: true,
        controlFlowFlatteningThreshold: 0.75,
        deadCodeInjection: true,
        deadCodeInjectionThreshold: 0.4,
        debugProtection: false,
        debugProtectionInterval: false,
        disableConsoleOutput: true,
        identifierNamesGenerator: 'hexadecimal',
        log: false,
        numbersToExpressions: true,
        renameGlobals: false,
        rotateStringArray: true,
        selfDefending: true,
        shuffleStringArray: true,
        simplify: true,
        splitStrings: true,
        splitStringsChunkLength: 10,
        stringArray: true,
        stringArrayEncoding: ['base64'],
        stringArrayWrappersCount: 2,
        stringArrayWrappersChainedCalls: true,
        stringArrayWrappersType: 'variable',
        stringArrayThreshold: 0.75,
        transformObjectKeys: true,
        unicodeEscapeSequence: false,
    },
});

I have been trying to obfuscate the code for a while by using react-native-obfuscating-transformer. Everything seems okay but when I check the bundle.js. I can't see any obfuscated code.

PS: Currently, I try only for IOS.

Here are my config files.

metro.config.js

module.exports = {
    transformer: {
        babelTransformerPath: require.resolve('./transformer'),
        getTransformOptions: async () => ({
            transform: {
                experimentalImportSupport: false,
                inlineRequires: false,
            },
        }),
    },
};

transformer.js

const obfuscatingTransformer = require('react-native-obfuscating-transformer');

module.exports = obfuscatingTransformer({
    upstreamTransformer: require('metro-react-native-babel-transformer'),
    enableInDevelopment: true,
    obfuscatorOptions: {
        pact: true,
        controlFlowFlattening: true,
        controlFlowFlatteningThreshold: 0.75,
        deadCodeInjection: true,
        deadCodeInjectionThreshold: 0.4,
        debugProtection: false,
        debugProtectionInterval: false,
        disableConsoleOutput: true,
        identifierNamesGenerator: 'hexadecimal',
        log: false,
        numbersToExpressions: true,
        renameGlobals: false,
        rotateStringArray: true,
        selfDefending: true,
        shuffleStringArray: true,
        simplify: true,
        splitStrings: true,
        splitStringsChunkLength: 10,
        stringArray: true,
        stringArrayEncoding: ['base64'],
        stringArrayWrappersCount: 2,
        stringArrayWrappersChainedCalls: true,
        stringArrayWrappersType: 'variable',
        stringArrayThreshold: 0.75,
        transformObjectKeys: true,
        unicodeEscapeSequence: false,
    },
});

• javascript
• react-native
• obfuscation

Share Improve this question Follow edited Oct 13, 2020 at 16:52 Halil İbrahim Özdoğan asked Oct 8, 2020 at 14:58 Halil İbrahim ÖzdoğanHalil İbrahim Özdoğan 59711 gold badge55 silver badges1313 bronze badges

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2 Answers 2

Sorted by: Reset to default 4 +50

I finally figured out how to make it work after several test.

my react and react native version:

 "react": "16.9.0",
 "react-native": "0.61.5",

install other dependencies needed:

npm install babylon --save
npm install --save babel-traverse

transformer.js

const obfuscatingTransformer = require("react-native-obfuscating-transformer")
const filter = filename => { 
  return filename.startsWith("src");
};

module.exports = obfuscatingTransformer({
// this configuration is based on https://github./javascript-obfuscator/javascript-obfuscator
  obfuscatorOptions:{
    pact: true,
    controlFlowFlattening: false,
    deadCodeInjection: false,
    debugProtection: false,
    debugProtectionInterval: false,
    disableConsoleOutput: true,
    identifierNamesGenerator: 'hexadecimal',
    log: false,
    renameGlobals: false,
    rotateStringArray: true,
    selfDefending: true,
    shuffleStringArray: true,
    splitStrings: false,
    stringArray: true,
    stringArrayEncoding: ['base64'],
    stringArrayThreshold: 0.75,
    unicodeEscapeSequence: false
  },
  upstreamTransformer: require('metro-react-native-babel-transformer'),
  emitObfuscatedFiles: false,
  enableInDevelopment: true,
  filter: filter,
  trace: true
})

metro.config.js

module.exports = {
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: false,
      },
    }),
    babelTransformerPath: require.resolve("./transformer")   // add here the transformer.js
  },
};

NOTE:

set emitObfuscatedFiles to true in obfuscatorOptions to emit the obfuscated versions of files alongside their originals, for parison.

If you're building in release, you can also pare the generated index.android.bundle (located in \android\app\build\generated\assets\react\release) with and without using the react-native-obfuscating-transformer using online diff tool to see the difference

I was not able to get my js code obfuscated with this method, but I think I managed to do it with this package. I am interested in hearing your opinions. https://www.npmjs./package/obfuscator-io-metro-plugin

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