composingPromisesErlangStyle.js

import { should, each, iff, prop, props } from 'rvl-pipe'
import { createUser, createAuthToken, authTokenValidator, requestValidator } from '../account'
import ctx from './dummyContext'

const registerUser = each(
    validateRequest(requestValidator),     
    generatePasswordHash(prop('body.password'), 'passwordHash'),
    createDocument('users', createUser, "userAccount"),
    should(prop('userAccount'), 'invalidUser'),
    createJsonWebToken(createAuthToken),
    props({ token: prop('token') }),
    validateResponse(authTokenValidator)
);

const registerHandler = (req, res) => regiterUser({ ...ctx, body: req.body, headers: req.headers });
app.post('api/v1/register', registerHandler);