app.js

/// load modules 
var express = require("express");
// instanitate the app
var app = express();

const subjects = {};
const starttime = Date.now();


//const BoxSDK = require("box-node-sdk");
//const fs = require('fs');
const Dropbox = require("dropbox").Dropbox;
const fetch = require("node-fetch");
const body_parser = require("body-parser");


const dbx = new Dropbox({
    accessToken: 'YOURACCESSTOKEN',
    fetch
});


saveDropbox = function (content, filename, foldername) {
    return dbx.filesGetMetadata({
        path: "/" + foldername,
    }).catch(err => {
        //      console.log(err['error']['path'])
        if (err.error.error.path['.tag'] == 'not_found') {
            return dbx.filesCreateFolder({
                path: "/" + foldername,
                autorename: false,
            });
        } else {
            throw err;
        }
    }).then(() => {
        return dbx.filesUpload({
            path: "/" + foldername + "/" + filename,
            contents: content
        });
    });
};


saveDropboxSingleFile = function (content, filename) {
    return dbx.filesUpload({
        path: "/" + filename,
        contents: content,
        autorename: false,
        mode:  'overwrite'
    });
};


app.set('port', (process.env.PORT || 2500));

// static
app.use(express.static(__dirname + '/public'));
app.use(body_parser.json({ limit: "50mb" }));


app.get("/", function (request, response) {
    response.render("index.html");
})
app.post("/data", function (request, response) {
    //convert json to csv
    request.setTimeout(0);
    // DATA_CSV = json2csv(request.body);
    data = request.body;
    id = data[0].subject;
    // id = row[1].split(",")[Id_index];
    id = id.replace(/'/g, "");
    var currentdate = new Date();
    filename = Number(currentdate) + ".json";
    foldername = id;
    data = JSON.stringify(data);
    saveDropbox(data, filename, foldername).catch(err => console.log(err))
}
);

app.post("/subject-status", function (request, response) {
    subject_id = request.body.subject_id;
    status = request.body.status;
    subjects[subject_id] = status;
    saveDropboxSingleFile(JSON.stringify(subjects), `subject_status_${starttime}.json`)
    .then(() => console.log(`subjuct status recorded: ${subject_id},${status}`))
    .catch(err => console.log(err));
});


//start the server
app.listen(app.get('port'), function () {
    console.log("listening to port :",(process.env.PORT || 2500));
});