server.js

const express = require('express');
let rp = require('request-promise');
const bodyParser = require('body-parser');
const cheerio = require('cheerio');
const sampleData = require('./sample_data');
const app = express();

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(express.static('app'));

// Setup Cookie Jar
let jar = rp.jar();
rp = rp.defaults({ jar: jar });

// Setup Request Options
const loginPage = 'https://mealacct.mcmaster.ca/OneWeb/Account/LogOn';
const transactionPage =
  'https://mealacct.mcmaster.ca/OneWeb/Financial/TransactionsPass?dateFrom=2016%2F01%2F13+00%3A00%3A00&dateTo=2100%2F08%2F13+23%3A59%3A59&returnRows=1000&_=' +
  Date.now();

// Handle API Call
app.post('/api', (req, res) => {
  // Clear cookie jar on each request
  jar = rp.jar();

  let token = 0;
  let studentNumber = req.body.studentNumber;
  let accountPin = req.body.accountPin;

  const getTokenOptions = {
    uri: loginPage,
    transform: body => {
      return cheerio.load(body);
    }
  };

  function sendResults(data) {
    res.send(data);
  }

  if (+studentNumber === 400120999 && +accountPin === 1234)
    return sendResults(sampleData);

  // Acquire Login Token
  rp(getTokenOptions)
    .then($ => {
      token = $('[name=__RequestVerificationToken]').val();
      params = {
        __RequestVerificationToken: token,
        Account: studentNumber,
        Password: accountPin
      };
      console.log('Request Token Acquired');

      const loginOptions = {
        method: 'POST',
        uri: loginPage,
        form: params
      };

      // Login to Payment System
      rp(loginOptions)
        // Returns 200 if login is bad
        .then(res => {
          sendResults('Incorrect student number / pin');
          console.log('Incorrect student number / pin');
        })
        .catch((res, err) => {
          if (res.statusCode == 302) {
            console.log('Logged in');

            const scrapeOptions = {
              uri: transactionPage,
              transform: body => {
                return cheerio.load(body);
              }
            };

            // Scrape Transaction History
            rp(scrapeOptions)
              .then($ => {
                let trns = [];

                $('table.table > tbody > tr').each((i, elem) => {
                  let dateTime = $(elem)
                    .children('td[data-title="Date:"]')
                    .html();
                  let date = dateTime.match(/\d{2}\/\d{2}\/\d{4}/g)[0];
                  let time = dateTime.match(
                    /\d{1,2}:\d{2}:\d{2} (?:PM|AM)/g
                  )[0];

                  trns[i] = {
                    date: date,
                    time: time,
                    amount: $(elem)
                      .children('td[data-title="Amount:"]')
                      .html()
                      .replace(',', ''),
                    account: parseInt(
                      $(elem)
                        .children('td[data-title="Balance:"]')
                        .html()
                    ),
                    desposit: parseInt(
                      $(elem)
                        .children('td[data-title="Units:"]')
                        .html()
                    ),
                    trantype: $(elem)
                      .children('td[data-title="Trantype:"]')
                      .html()
                      .trim(),
                    terminal: $(elem)
                      .children('td[data-title="Terminal:"]')
                      .html()
                      .trim()
                      .slice(8) // Fix this hack with regex
                  };
                });

                trns.reverse();

                console.log('Data processed');
                sendResults(trns);
              })
              .catch(err => {
                sendResults('Error scraping transaction page');
                console.log('Error scraping transaction page');
              });
          } else {
            sendResults('Error logging in:\n', res.statusCode);
            console.error('Error logging in:\n', res.statusCode);
          }
        });
    })
    .catch(err => {
      sendResults('Error acquiring login token');
      return console.error(err);
    });
});

const port = process.env.PORT || 3000;
app.listen(port);

console.log('Magic happens on port', port);