src/server.js

/**
 * {express} minimal and flexible Node.js web application framework
 * that provides a robust set of features for web and mobile applications.
 */
const express = require('express');
/**
 * {bodyParser} Parse incoming request bodies in a middleware
 * before your handlers, available under the req.body property.
 */
const bodyParser = require('body-parser');
/**
 * {app} instance of express
 */
const app = express();
/**
 * {MongoClient} client for database connection
 */
const MongoClient = require('mongodb').MongoClient;
/**
 * {path} framework to resolve paths
 */
const path = require('path');
/**
 * {MDReplacer} MDReplacer instance
 */
const MDReplacer = require('./MDReplacer');
//member
let db;
/**
 * instance of MDReplacer
 */
let parser = new MDReplacer.MDReplacer();
// make public folder accessible to public
app.use(express.static(path.resolve('./public')));
app.use("/css", express.static(path.resolve('./public/css')));
app.use("/js", express.static(path.resolve('./public/js')));
//database setup
MongoClient.connect('mongodb://dbuser:[email protected]:15131/mongo-test-db', (err, database) => {
    // start the server
    if (err)
        return console.log('DB-CONNECTION-ERR: ' + err);
    db = database;
    // set port to listen
    app.listen(normalizePort(process.env.PORT || 3000), () => {
        console.log('listening on 3000');
    });
    //clean history on startup
    db.collection('inputs').drop((err, result) => {
        if (err)
            return console.log('WARN:' + err);
        console.log("INFO: history clean!");
    });
});
// middleware 
app.set('view engine', 'ejs');
// body-parser extracts the data from the form element and 
// add them to the body property in the request object
app.use(bodyParser.urlencoded({ extended: true }));
//let server read json data
app.use(bodyParser.json());
// routing
app.get('/', (req, res) => {
    db.collection('inputs').find().toArray((err, result) => {
        if (err)
            return console.log(err);
        if (result === null) {
            result = "test";
        }
        res.render('index.ejs', { inputs: result });
    });
});
app.post('/inputs', (req, res) => {
    var parsedText = parser.replace(req.body.input + '');
    var toSave = {
        name: req.body.name,
        input: req.body.input,
        output: parsedText
    };
    var history;
    db.collection('inputs').save(toSave, (err, result) => {
        if (err)
            return console.log('SAVE-DB-ERR:' + err);
        console.log('INFO: saved to database');
        db.collection('inputs').find().toArray((err, result) => {
            if (err)
                return console.log('FIND-ON-DB-ERR: ' + err);
            history = result;
            res.setHeader('Content-Type', 'application/json');
            res.redirect('/');
        });
    });
});
app.put('/inputs', (req, res) => {
    db.collection('inputs')
        .findOneAndUpdate({ name: 'input' }, {
        $set: {
            name: req.body.name,
            input: req.body.input,
            output: req.body.output
        }
    }, {
        sort: { _id: -1 },
        upsert: true
    }, (err, result) => {
        if (err)
            return res.send(err);
        res.send(result);
    });
});
app.delete('/inputs', (req, res) => {
    db.collection('inputs').drop((err, result) => {
        if (err)
            return res.status(500).send(err);
        console.log("INFO: history clean!");
        res.status(200).send("INFO: history clean!");
    });
});
/**
 * Normalize a port into a number, string, or false.
 */
function normalizePort(val) {
    var port = parseInt(val, 10);
    if (isNaN(port)) {
        // named pipe
        return val;
    }
    if (port >= 0) {
        // port number
        return port;
    }
    return false;
}
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