react-native-obfuscator

Obfuscate selected source files when building for React Native.


The original package react-native-obfuscating-transformer seems to be broken. So I fixed it.

Installation

npm i git+https://github.com/AustinZuniga/react-native-obfuscator.git


Install needed npm packages

npm i babylon babel-traverse

Usage

$3

#### /metro.config.js

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

#### /transformer.js
> best working obfuscatorOptions after several test.

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

module.exports = obfuscatingTransformer({
obfuscatorOptions:{
compact: true, // default true
controlFlowFlattening: false, // default false
controlFlowFlatteningThreshold: 0.75, // default 0.75
deadCodeInjection: false, // default false
deadCodeInjectionThreshold: 1, // default 0.4
debugProtection: false, // default false
debugProtectionInterval: false, // default false
disableConsoleOutput: true,
identifierNamesGenerator: 'hexadecimal', // default hexadecimal
log: false, // default false
renameGlobals: true, // default false
rotateStringArray: true, // default true
seed: 0,// default 0
selfDefending: false, // default true: not working if true
shuffleStringArray: true, // default true
sourceMapMode: 'separate', // default seperate
splitStrings: true, // default false
splitStringsChunckLength: 10, // default 10
stringArray: true, // default true
stringArrayEncoding: 'rc4', // default false
stringArrayThreshold: 0.75, // default 0.8
target: 'browser', // default browser
transformObjectKeys: true, // default false
unicodeEscapeSequence: true
},
upstreamTransformer: require('metro-react-native-babel-transformer'),
emitObfuscatedFiles: false,
enableInDevelopment: false,
filter: filter,
trace: true
})
`

$3

$3

`dif
module.exports = {
+ transformer: {
+ babelTransformerPath: require.resolve("./transformer")
+ },
}
`

#### /transformer.js

`js
const obfuscatingTransformer = require("react-native-obfuscator")

module.exports = obfuscatingTransformer({
/ options /
})
`

Configuration

Options are:

$3

Defines what the first pass of code transformation is. If you don't use a custom transformer already,
you don't need to set this option.

TypeScript example:

`dif
const obfuscatingTransformer = require('react-native-obfuscator')
+ const typescriptTransformer = require('react-native-typescript-transformer')

module.exports = obfuscatingTransformer({
+ upstreamTransformer: typescriptTransformer
})
`

#### Default value: require('metro/src/transformer')

$3

Returns true for any files that should be obfuscated and false for any files which should not be obfuscated.

By default, it obfuscates all files in src/*/

$3

Warning — Not all options are guaranteed to produce working code. In particular, stringArray definitely breaks builds.

See the javascript-obfuscator docs for more info about what each option does.

`ts
interface ObfuscatorOptions {
compact?: boolean
controlFlowFlattening?: boolean
controlFlowFlatteningThreshold?: 0.75
deadCodeInjection?: boolean
deadCodeInjectionThreshold?: 0.4
debugProtection?: boolean
debugProtectionInterval?: boolean
disableConsoleOutput?: boolean
domainLock?: string[]
identifierNamesGenerator?: "hexadecimal" | "mangled"
log?: boolean
renameGlobals?: boolean
reservedNames?: string[]
rotateStringArray?: boolean
seed?: 0
selfDefending?: boolean
sourceMap?: boolean
sourceMapBaseUrl?: string
sourceMapFileName?: string
shuffleStringArray?: boolean
sourceMapMode?: "separate" | "inline"
splitStrings?: boolean,
splitStringsChunckLength: 10, // default 10
stringArray?: boolean
stringArrayEncoding?: boolean|string
stringArrayThreshold?: 0.75
target?: "browser" | "extension" | "node"
transformObjectKeys?:boolean
unicodeEscapeSequence?: boolean
}
`

$3

if true, prints a list of files being obfuscated

#### Default value: false

$3

if true, emits the obfuscated versions of files alongside their originals, for comparison.

#### Default value: false

$3

If true, enables obfuscation in development mode.

#### Default value: false`

Known Issue

* identifierNamesGenerator's not working correctly
POSSIBLE SOLUTION

Reference

react-native-obfuscating-transformer