server.js

const mongoose = require('mongoose');
mongoose.connect('mongodb://jteng:routermaker22@ds113402.mlab.com:13402/webdev-summer2-2018', { useNewUrlParser: true })

var express = require('express')
var app = express()

// const origin = "http://localhost:4200";
const origin = (process.env.PORT ? "https://webdev-client-angular-jteng.herokuapp.com" : "http://localhost:4200");

app.use((req, res, next) => {
    res.header("Access-Control-Allow-Origin",
        origin);
    res.header("Access-Control-Allow-Headers",
        "Origin, X-Requested-With, Content-Type, Accept");
    res.header("Access-Control-Allow-Methods",
        "GET, POST, PUT, DELETE, OPTIONS");
    res.header("Access-Control-Allow-Credentials", "true");
    next();
});

var session = require('express-session');
var RedisStore = require('connect-redis')(session);
app.use(session({
    store: new RedisStore({
        url: 'redis://h:p7cc735781fad2544be6dbf24401643a06c2d1cea91bc2ebcf9612f8da0317d05@ec2-34-231-81-175.compute-1.amazonaws.com:33259'
    }),
    resave: false,
    saveUninitialized: true,
    secret: 'secret556',
    cookie: {
        maxAge: 1000 * 60 * 30
    }
}));

var bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: true
}));

require('./services/user.service.server')(app);
require('./services/section.service.server')(app);
require('./services/question.service.server')(app);
require('./services/quiz.service.server')(app);

app.listen(process.env.PORT || 4000);