server.js

const express = require('express');
const app = express();
const path = require('path');
const bodyParser = require('body-parser');
const mongodb = require('mongodb');
const MongoClient = mongodb.MongoClient;
const URI = process.env.MONGODB_URI || 'mongodb://localhost/database';
const PORT = process.env.OPENSHIFT_NODEJS_PORT || 8080;
const IP = process.env.OPENSHIFT_NODEJS_IP || '127.0.0.1';
const DB_NAME = process.env.DB_NAME;

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

app.get('/secret', (req, res)=>{
  res.sendFile(path.join(__dirname, 'secret.html'));
});

app.post('/secret', (req, res)=>{
  MongoClient.connect(URI, {useNewUrlParser: true}, (err, client)=>{
    if(err){
      console.log(err);
    }
    else{
      const db = client.db(DB_NAME);
      const collection = db.collection('names');
      const entry = {
        name: req.body.name.toLowerCase(),
        card: req.body.number + '_of_' + req.body.suit
      };
      collection.insertOne(entry, (err, result)=>{
        if(err){
          console.log(err);
        }
        else{
          res.send('Inserted into databse');
        }
      });
      db.close();
    }
  });
});

app.get('/:param*', (req,res)=>{
  const name = req.url.slice(1).toLowerCase();
  MongoClient.connect(URI, {useNewUrlParser: true}, (err, client)=>{
    if(err){
      console.log(err);
    }
    else{
      const db = client.db(DB_NAME);
      const collection = db.collection('names');

      if(name === 'deleteall'){
        collection.remove({});
        res.send('database reset!');
      }
      else{
        collection.find({name: name}).toArray((err,result)=>{
          if(err){
            console.log(err);
          }
          else if(result.length){
            const card = result[result.length-1].card + '.png';
            res.sendFile(path.join(__dirname + '/cards/' + card));
          }
          else{
            res.sendStatus(404);
          }
          db.close();
        });
      }
    }
  });
});

app.listen(PORT, IP, ()=> console.log('Server listening on port' + PORT));