index.js

const express = require('express');
const fileUpload = require('express-fileupload');
const cors = require('cors');
const port = 3000;

const app = express();
app.use(express.urlencoded({ extended: true }));
app.use(express.json());
app.use(fileUpload());
app.set('trust proxy', true);
app.use(
    cors({
        origin: 'https://www.*.my.salesforce.com'
    })
);
app.use((req, res, next) => {
    console.log(req.ip);
    let env = process.env.validIP;
    let accept = env.split(',');
    if (accept.includes(req.ip)) {
        next();
    } else {
        const error = new Error('Invalid Request');
        next(error);
    }
});
app.use((err, req, res, next) => {
    res.status(500);
    res.send(err.message);
});

require('./routes/routes.js')(app);

app.listen(port, () => {
    console.log(`Listening on ${port}`);
});