Webservice Aggregator for foaas.com and randomuser.me

server.js

'use strict';

const express = require('express');
const request = require('request-promise');

const FOAAS_URL  = 'http://foaas.com/';
const RANDOM_URL = 'http://api.randomuser.me/';

const logError = console.log.bind( console );

function encodeName(a, b) {
  return capital(a) + '%20' + capital(b);

  function capital( str ) {
    return str.charAt(0).toUpperCase() + str.slice(1);
  }
}

const api = express();

api.get('/api/:type', (req, res) => {
  const type = req.params.type;

  if(!req.types.has(type)) {
    return res.sendStatus(404);
  }

  const numNames = req.types.get(type);

  request(RANDOM_URL + '?results=' + numNames )
    .then(JSON.parse)
    .then(res => res.results.map(result => encodeName(result.user.name.first, result.user.name.last )))
    .then(names => names.reduce((p, c) => p + '/' + c , ''))
    .then(addition => request(FOAAS_URL + type + addition))
    .then(res.send.bind(res))
    .catch(logError);
});

request(FOAAS_URL + 'operations')
  .then(JSON.parse )
  .then(data => {
    const types = new Map();
    
    for (let i = 0; i < data.length; i++) {
      types.set(data[i].url.match(/^\/([a-z\-]+)(\/|$)/)[1], data[i].fields.length);
    }

    return types;
  })
  .then(types => {
    const app = express();

    app.use((req, res, next) => {
      req.types = types;
      next();
    });

    app.use(api);
    
    app.listen(3000);
  })
  .catch( logError );