app.js

const express = require('express')
const cookieParser = require('cookie-parser')
const logger = require('morgan')
const { check } = require('express-validator')

const QRCode = require('qrcode')

const app = express()

app.use(logger('dev'))
app.use(express.json())
app.use(express.urlencoded({ extended: false }))
app.use(cookieParser())

app.set('views', './views')
app.set('view engine', 'ejs')

const config = require('./lib/config')

app.get('/', function (req, res) {
    res.redirect(config.wikiUrl)
})

app.get('/:page', [check('page').isString().trim().escape()], function (req, res) {
    const { page } = req.params

    if (page !== undefined && typeof page === 'string') {
        res.redirect(config.wikiUrl + '?id=' + page)
    } else {
        res.json({ result: 'ERROR', message: 'Missing or invalid page' })
    }
})

app.get('/:page/qr', [check('page').isString().trim().escape()], function (req, res) {
    const { page } = req.params

    const { baseUrl, wikiUrl, qrCodeOptions } = config

    if (page !== undefined && typeof page === 'string') {
        QRCode.toDataURL(`${wikiUrl}?id=${page}`, qrCodeOptions, (err, qrImgData) => {
            if (err) {
                console.log('error: ' + err)
                res.json({
                    result: 'ERROR',
                    message: 'Error while generating QR code'
                })
            }

            res.render('qrinfo', { baseUrl, wikiUrl, page, qrImgData })
        })
    } else {
        res.json({ result: 'ERROR', message: 'Missing or invalid page' })
    }
})

module.exports = app