[Node.js] Gzip + crypto in stream

We can using gzip and crypto with stream:

const fs = require('fs')

const zlib = require('zlib')

const file = process.argv[2];

const crypto = require('crypto');

const {Transform} = require('stream');

const progress = new Transform({

    transform(chunk, encoding, callback) {

        process.stdout.write('.')

        callback(null, chunk)

    }

});

//crypto + gzip

fs.createReadStream(file)

    .pipe(zlib.createGzip())

    .pipe(crypto.createCipher('aes192', 'a_secret'))

    .pipe(progress)

    //.on('data', () => process.stdout.write('.')) // loading / processing

    .pipe(fs.createWriteStream(file + '.zz'))

    .on('finish', () => console.log('DONE'));

Also unzip it:

// uncrypto + unzip

fs.createReadStream(file)

    .pipe(crypto.createCipher('aes192', 'a_secret'))

    .pipe(zlib.createGunzip())

    .pipe(progress)

    .pipe(fs.createWriteStream(file.slice(0, -3)))

    .on('finish', () => console.log('DONE'))