.js

function parse(body) {
  return body.phoneNumber?  validate(formatCountry(body.phoneNumber)).map(aggregate({ source: 'website' }))
  :      body.From?         validate(formatCountry(body.From)).map(aggregate({ source: 'cookie' }))
  :      /* otherwise */    Failure({ status: 522, message: 'Please enter a valid US number!' })
}


// This returns a promise with the result
export function create(req) {
  return parse(req.body)
          .toPromise()
          .then(function({ number, source }) {
            return { data: Pre.findOrCreate({phoneNumber, source}) };
          })
}