index.js

const express = require('express');
const request = require('request');
const LimitingMiddleware = require('limiting-middleware');

const app = express();

app.use(new LimitingMiddleware().limitByIp());

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  next();
});

app.get('/', (req, res) => {
  res.send('Try /deck/new/shuffle, or /deck/:deck_id/draw');
});

// make a request to the deck of cards api that the student can use to get around cors
app.get('/deck/new/shuffle', (req, res, next) => {
  /**
   * 7/3/19. The /shuffle endpoint is currently having issues in the base API.
   */
  request({
    url: 'https://deckofcardsapi.com/api/deck/new/shuffle/'
  }, (error, response, body) => {
    if (body.substring(0, 1) === '{') {
        return res.json(JSON.parse(body));
    }

    return next(new Error('https://deckofcardsapi.com/api/deck/new/ returns unexpected data'));
  });
});

app.get('/deck/:deck_id/draw', (req, res) => {
  const { deck_id } = req.params;

  request({
    url: `https://deckofcardsapi.com/api/deck/${deck_id}/draw/`
  }, (error, response, body) => {
    res.json(JSON.parse(body));
  });
});

app.use((err, req, res, next) => {
  const statusCode = err.statusCode || 500;

  res.status(statusCode).json({
    type: 'error', message: err.message
  })
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => console.log(`listening for requests on ${PORT}`));