server.js

// dotenv for process.env keys
require("dotenv").config();

const path = require("path");

// express
const express = require("express");
const app = express();
app.use(express.json()); // for parsing application/JSON
const server = require("http").Server(app);

// socket.io
const io = require("socket.io")(server);
io.on("connection", function(socket) {
  console.log("a user connected");
});

// set socket.io in the express app, so it can be accessed within auth.js
app.set("io", io);

// initialize passport & load passport strategy
const passport = require("passport");
app.use(passport.initialize());
const GoogleOAuthStrategy = require("./server/passport/google-oauth");
passport.use("google-oauth", GoogleOAuthStrategy);

// express-session
const session = require("express-session");

// connect-pg-simple: for storing Express session data in Postgres
// we need this to save web socket IDs to the request.
// the app uses web sockets to forward JSON web tokens to client instances once they are authenticated.
const pgSession = require("connect-pg-simple")(session);

app.use(
  session({
    resave: false,
    secret: process.env.SESSION_SECRET,
    saveUninitialized: true,
    store: new pgSession({
      conString: process.env.POSTGRES_CONNECTION_STRING,
      ttl: 7 * 24 * 60 * 60 // one week
    })
  })
);

// static files
app.use(express.static("./dist"));

// custom routes
const api = require("./server/routes/api");
app.use("/api", api);
const auth = require("./server/routes/auth");
app.use("/auth", auth);

// serve index.html
app.get("/*", function(request, response, next) {
  response.sendFile(path.join(__dirname, "/dist/index.html"));
});

const port = process.env.PORT || 8080;

server.listen(port, function() {
  console.log("App listening on port " + port + "!");
});