main.js

require('dotenv').config()

const schools = require('./schools');
const getTimetable = require("./fetchData")

const express = require('express');
const app = express();

const exphbs = require('express-handlebars');
app.engine('handlebars', exphbs());
app.set('view engine', 'handlebars');

const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({
  extended: false
}));

app.get('/', (req, res) => {
  res.redirect("/login")
})

app.get("/timetable", (req, res) => {
  res.redirect("/login")
})

app.get("/about", (req, res) => {
  res.render("about")
})

app.get("/terms", (req, res) => {
  res.render("terms")
})

function getSchool(name) {
  for (let i = 0; i < schools.length; i++) {
    if (schools[i].name === name) {
      return schools[i]
    }
  }
}

app.get("/login", (req, res) => {
  let data = {
    schools: schools
  }
  if (req.query.error == 401) data.errorMsg = "Feil brukernavn, passord eller skole"
  if (req.query.error == 500) data.errorMsg = "Vi kan dessverre ikke hente timeplanen din, grunnet en ukjent feil.  Årsaken er antageligvis en endring på nettsida til Visma."
  res.render("login", data)
})

function requstTimetable(login_name, password, schoolName, date, callback) {
  const loginName = login_name.toLowerCase();
  const school = getSchool(schoolName);

  function validateDate(date) {
    // This will not catch some invalid dates (31/04 or 29/02)
    if(date.match(/\d{2}\/\d{2}\/\d{4}/)) {
      s = date.split("/")
      return !isNaN(Date.parse(`${s[1]}/${s[0]}/${s[2]}`))
    }
    return false
  }

  if (!validateDate(date)) {
    //res.status(400).send("Invalid date")
    callback(400, null)
  } else if (school) {
    getTimetable(loginName, password, school.link, date, "viken.no", (data, err) => {
      if (err == "ERROR") {
        //res.redirect(`/login?error=500`)
        callback(500, null)
      } else if (err == "Failed to login") {
        //res.redirect(`/login?error=401`)
        callback(401, null)
      } else {
        //res.render("timetable", {
        //  data: JSON.stringify(data)
        //})
        callback(200, data)
      }
    })
  } else {
    //res.redirect("/login?error=401")
    callback(401, null)
  }
}

app.post("/timetable", (req, res) => {
  requstTimetable(req.body.login_name, req.body.password, req.body.school, req.body.date, (status, data) => {
    if (status === 200) {
      res.render("timetable", {
        data: JSON.stringify(data)
      })
    } else if (status === 400) {
      res.status(400).send("Invalid date")
    } else if (status === 401) {
      res.redirect("/login?error=401")
    } else if(status === 500) {
      res.redirect(`/login?error=500`)
    }
  })
})

app.post("/timetableJSON", (req, res) => {
  requstTimetable(req.body.login_name, req.body.password, req.body.school, req.body.date, (status, data) => {
    res.status(status).send(data)
  })
})

app.use(express.static('public'))

app.use((req, res) => {
  res.status(404).render("404")
})

app.listen(process.env.PORT || 80, () => console.log(`Listening on: ${process.env.PORT || 80}`))