Doorbell.io Node.js server side integration

doorbell.js

var crypto = require('crypto');

var DOORBELL_SECRET = '--your secret--';
var DOORBELL_KEY = '--your app key--';

function getOptions() {
  var options = {
    appKey: DOORBELL_KEY,
    timestamp: Math.floor(new Date() / 1000),
    token: crypto.randomBytes(16).toString('hex')
  };

  options.signature = crypto
    .createHmac("sha256", DOORBELL_SECRET)
    .update('' + options.timestamp + options.token)
    .digest("hex");

  return options;
}

module.exports = {
  getOptions: getOptions
}

layout.jade

script.
  window.doorbellOptions = #{JSON.stringify(doorbellOptions)};
  // rest of the doorbell snippet - make sure not to over-run the doorbellOptions object

server.js

var express = require('express');
var doorbell = require('./doorbell');

var app = express();

app.use(function(req, res, next){
  res.locals.doorbellOptions = getDoorbellOptions();
  return next();
});

app.listen();