letsencrypt with node and heroku

main.js

var LE = require('letsencrypt');
var pem = require('pem');
var RSVP = require('rsvp');
var fs = require('fs');
var path = require('path');
var mkdirp = require('mkdirp');

var domains, herokuAppName, duplicate;
if (process.env.YAPP_ENV === 'qa') {
  domains = ['heroku.yappqa.us', 'my.yappqa.us', 'api.yappqa.us', 'support.yappqa.us' ];
  herokuAppName = 'qa-yapp-cedar';
  duplicate = true; // create new cert even if they are less than 1 week old
} else if (process.env.YAPP_ENV === 'prod') {
  domains = ['heroku.yapp.us', 'my.yapp.us', 'api.yapp.us', 'support.yapp.us'];
  herokuAppName = 'yapp-cedar';
  duplicate = false;
} else {
  throw new Error('Must provide valid YAPP_ENV (qa or prod)');
}

var redisUrlExtraction = new RSVP.Promise(function(resolve, reject){
  var exec = require('child_process').exec;
  exec('heroku config:get REDISTOGO_URL --app ' + herokuAppName, function (error, stdout, stderr) {
    var redisUrl = stdout.replace(/\n/, '').replace(/\/\/redistogo:/, '//:');
    if (error) {
      reject(error);
    } else {
      resolve(redisUrl);
    }
  });
});

var createPrivateKey = RSVP.denodeify(pem.createPrivateKey);

var privateKeyGeneration = createPrivateKey(2048).then(function(privateKey) {
  var pemPath = require('homedir')() + '/letsencrypt/etc/live/' + domains[0] + '/privkey.pem';
  mkdirp.sync(path.dirname(pemPath));
  fs.writeFileSync(pemPath, privateKey.key);
}).catch(function(reason){
  console.log(reason);
  throw reason;
});

privateKeyGeneration.then(function(){
  var config = {
    server: LE.productionServerUrl,
    manual: true,
    configDir: require('homedir')() + '/letsencrypt/etc',
    privkeyPath: ':config/live/:hostname/privkey.pem',
    fullchainPath: ':config/live/:hostname/fullchain.pem',
    certPath: ':config/live/:hostname/cert.pem',
    chainPath: ':config/live/:hostname/chain.pem',
    debug: true
  };

  var handlers = {
    setChallenge: function (opts, hostname, key, val, cb) {
      // called during the ACME server handshake, before validation
      redisUrlExtraction.then(function(redisUrl){
        var redis = require("redis");
        var redisClient = redis.createClient(redisUrl);
        redisClient.set("letsencrypt:" + key, val, function(err){
          // console.log("set redis key letsencrypt:" + key + " = " + val);
          if (err) {
            console.log(err);
            throw err;
          }
          cb();
        });
      }).catch(function(reason){
        console.log(reason);
        throw reason;
      });
    },
    removeChallenge: function (opts, hostname, key, cb) {} // called after validation on both success and failure
  };

  var le = LE.create(config, handlers);

  le.register({ // either renews or registers
    domains: domains,
    email: 'tech@yapp.us',
    agreeTos: true,
    duplicate: true
  }, function (err, results) {
    if (err) {
      console.error('[Error]: node-letsencrypt');
      console.error(err.stack || err);
      return;
    }

    if (!results || ('object' !== typeof results)) {
      console.error("Error: An unknown error occurred. My best guess is that we got an error that we're not used to from the ACME server and accidentally interpretted it as a success... or forgot to expose the error.");
      console.error(results);
      err = new Error("Here's a stack trace, in case it helps:");
      console.error(err.stack);
      return;
    }

    // if (handlers.closeServers) {
    //   handlers.closeServers();
    // }

    console.log('\nCertificate files downloaded! Please run:');
    console.log("heroku certs:update " + results.fullchainPath + ' ' + results.privkeyPath + ' --app ' + herokuAppName);

    process.exit(0);
  });
});

package.json

{
  "name": "node-ssl-script",
  "dependencies": {
    "homedir": "^0.6.0",
    "letsencrypt": "1.4.4",
    "mkdirp": "^0.5.1",
    "pem": "^1.8.3",
    "redis": "^2.6.1",
    "rsvp": "^3.2.1"
  }
}