env.sample

TOTP_SECRETS="token1:<Base32EncodedToken1> token2:<Base32EncodedToken2>"

GetTotpToken.js

const OTPAuth = require('otpauth');
require('dotenv').config();

module.exports = function(issuer) {
    let secrets = process.env.TOTP_SECRETS.split(' ')
      , secretsDict = secrets.reduce((previous, current) => {
          let secret = current.split(':');
          previous[secret[0]] = secret[1];
          return previous;
        }, {})
      , secret = secretsDict[issuer];

    if (!secret) return;

    let totp = new OTPAuth.TOTP({
        secret: OTPAuth.Secret.fromB32(secret),
        hmacAlgorithm: 'sha1'
    });

    return totp.generate();
}

index.js

#!/usr/bin/env node
'use strict';

const program = require("commander")
    , otpCode = require("./lib/GetTotpToken.js")
    , { version } = require('./package.json');

program
  .version(version, '-v, --version')
  .option('-n, --secret-name <n>','Want code\'s name')
  .parse(process.argv);

if (program.secretName) {
  console.log(otpCode(program.secretName));
  return 0;
}

// $ ./index.js -n token1
// or
otpCode('token1'); // <Base32EncodedToken1> totp token

// $ ./index.js -n token2
// or
otpCode('token2'); // <Base32EncodedToken2> totp token

package.json

{
  "name": "GetTotpToken.js",
  "description": "",
  "keywords": [],
  "author": "kPherox <[email protected]> (https://www.kr-kp.com/)",
  "license": "MIT",
  "version": "1.0.0",
  "main": "./index.js",
  "private": true,
  "dependencies": {
    "base-64": "^0.1.0",
    "commander": "^2.15.1",
    "dotenv": "^5.0.1",
    "otpauth": "^3.1.3"
  }
}

kPherox/TOTP-Authenticator