server.js

const express = require('express');
const path = require('path');
const compression = require('compression');
var enforce = require('express-sslify');

if (process.env.NODE_ENV !== 'production') require('dotenv').config();

const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);// needs to be done after above line where we get the config for dotenv so we have access to the secret key in the .env file

const app = express();
const port = process.env.PORT || 5000;

app.use(compression());
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

if (process.env.NODE_ENV === 'production') {
    app.use(enforce.HTTPS({ trustProtoHeader: true }));
    app.use(express.static(path.join(__dirname, 'client/build')));

    app.get('/service-worker.js', (req, res) => {
        res.sendFile(path.resolve(__dirname, '..', 'build', 'service-worker.js'));
    });

    app.get('*', function(req, res) { // give the user the index.html file in client/build when they do any get request
        res.sendFile(path.join(__dirname, 'client/build', 'index.html'));
    });
}

app.listen(port, error => {
    if (error) throw error;
    console.log('Server running on port ' + port);
});

app.post('/payment', (req, res) => {
    const body = {
        source: req.body.token.id,
        amount: req.body.amount,
        currency: 'usd'
    };

    stripe.charges.create(body, (stripeErr, stripeRes) => {
        if (stripeErr) {
            res.status(500).send({ error: stripeErr });
        } else {
            res.status(200).send({ success: stripeRes });
        }
    });
});