dkimpy

Node.js wrapper around the Python pip package dkimpy exposing DKIM and ARC signing and verification functions

Table of Contents

• Requirements
• Install
• Usage
  • dkimVerify
  • arcVerify
  • arcSign
• Contributors
• License

Requirements

1. Ensure that you have a Python version of >= 3.5 installed per dkimpy requirements (note that Python v3 is required because of a bug with DNS recursive CNAME lookups on v2.7):

   python3 --version

2. Install the package dkimpy and authres (authres is optional and used for ARC):

   pip3 install dkimpy authres

Install

npm:

npm install dkimpy

yarn:

yarn add dkimpy

Usage

dkimVerify

const fs = require('fs');

const { dkimVerify } = require('dkimpy');

const message = fs.readFileSync('/path/to/example.eml');

// then/catch usage
dkimVerify(message)
  .then(console.log)
  .catch(console.error);

// async/await usage
(async () => {
  try {
    const result = await dkimVerify(message)
    console.log(result);
  } catch (err) {
    console.error(err);
  }
})();

The value of result is a Boolean which indicates if DKIM verification was successful for the first DKIM-Signature header found on the email.

You can pass a second argument of index (defaults to 0, which means it looks for the first DKIM-Signature found).

arcVerify

const fs = require('fs');

const { arcVerify } = require('dkimpy');

const message = fs.readFileSync('/path/to/example.eml');

// then/catch usage
arcVerify(message)
  .then(console.log)
  .catch(console.error);

// async/await usage
(async () => {
  try {
    const result = await arcVerify(message)
    console.log(result);
  } catch (err) {
    console.error(err);
  }
})();

The value of result is an enumerable String which is one of:

• "none" indicates it does not have an ARC signature
• "pass" indicates its ARC signature was verified successfully
• "fail" indicates it had an ARC signature and it failed verification

arcSign

const fs = require('fs');

const { arcSign } = require('dkimpy');

const message = fs.readFileSync('/path/to/example.eml');
const selector = 'default'; // default._domainkey
const domain = 'example.com';
const srvId = 'mx.example.com';
const privateKeyFile = '/path/to/private.key';

// then/catch usage
arcSign(message, selector, domain, privateKeyFile, srvId)
  .then(console.log)
  .catch(console.error);

// async/await usage
(async () => {
  try {
    const result = await arcSign(message, selector, domain, privateKeyFile, srvId)
    console.log(result);
  } catch (err) {
    console.error(err);
  }
})();

The value of result is a String with the new ARC headers to add to the top of the message (if any).

Contributors

Name	Website
Nick Baugh	http://niftylettuce.com/

License

MIT © Nick Baugh