Dkim generator express

app.js

const NodeRsa = require('node-rsa');

function generateDkim (bits, domain, selector) {
    var key = new NodeRsa({b: bits});
    var privateKey = key.exportKey('pkcs8-private-pem');
    var publicKey = key.exportKey('pkcs8-public-pem');

    const dns = 
          selector + 
          '._domainkey.' + 
          domain + 
          " IN TXT " +
          "( v=DKIM1; p=" + public_key.replace('-----BEGIN PUBLIC KEY-----', '').replace('-----END PUBLIC KEY-----', '').replace(/\s/g, '') + " )";

    return {"privateKey": privateKey, "publicKey": publicKey, "dns": dns}
};


app.post('/dkim', (req, res) => {
    const bits = req.body.bits || 2048;
    const domain = req.body.domain;
    const selector = 'default';
    return generateDkim(bits, domain, selector)
});