server.js

const express = require("express");
const app = express();
const expressSession = require("express-session");
const path = require("path");
const mongoose = require("mongoose");
const enforce = require("express-sslify");
const cron = require("cron").CronJob;
const cors = require("cors");
const bodyParser = require("body-parser");
const passport = require("passport");
const localStrategy = require("passport-local");

//Models declarations
const Quiz = require("./models/quiz");
const Question = require("./models/question");
const User = require("./models/user");

//Routers
const indexRouter = require("./routes/index");
const quizRouter = require("./routes/quizzes");
const questionRouter = require("./routes/questions");
const sessionRouter = require("./routes/session");
const adminRouter = require("./routes/admin");
const authRouter = require("./routes/auth");

// Config declarations
const port = process.env.PORT || 5000;
const ip = process.env.IP;
const db = process.env.DATABASEURL || "mongodb://localhost/knowrona";
const seedDB = require("./config/seed");
const environment = process.env.NODE_ENV || "dev";

//Needed to make requests from front end to back end.
app.use(cors());

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

//mongoose connection
mongoose
  .connect(db, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useFindAndModify: false,
    useCreateIndex: true,
  })
  .then(() => {
    console.log("connected to: " + db);
  })
  .catch((err) => {
    console.log(err.message);
  });

//Passport Configuration
app.use(
  expressSession({
    secret: "try another username",
    resave: false,
    saveUninitialized: false,
  })
);
app.use(passport.initialize());
app.use(passport.session());
passport.use(new localStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());

app.use((req, res, next) => {
  res.locals.currentUser = req.user;
  next();
});


// Special for Dev Environment
if (environment == "dev") {
  require("dotenv").config();
  // Simulate loading
  const slowness = process.env.SLOWNESS || 0;
  let loadTime = slowness * 1000 * Math.random();
  app.use((req, res, next) => {
    setTimeout(() => {
      loadTime = slowness * 1000 * Math.random();
      console.log("loaded");
      next();
    }, loadTime);
  });
  app.get("/", (req, res) => {
    res.send("This page shows in dev mode only");
  });
}

// Creating routes
app.use(indexRouter);
app.use("/quizzes", quizRouter);
app.use("/questions", questionRouter);
app.use("/session", sessionRouter);
app.use("/admin", adminRouter);
app.use("/auth", authRouter);


// Regular DB clearance in Staging
if (environment == "staging") {
  var job = new cron(
    "0 0 20 * * *",
    function () {
      Quiz.deleteMany({}, (err, deletedQuizes) => {
        if (err) console.log(err);
        console.log("Scheduled deletion of quizzes");
      });
    },
    null,
    true,
    "America/Los_Angeles"
  );
  job.start();
}

// Calling the seed function
seedDB();

// Redirect to React in non Dev environment
if (environment !== "dev") {
  app.use(enforce.HTTPS({ trustProtoHeader: true }));
  app.use(express.static(path.join("client", "build")));
  app.get("*", (req, res) => {
    res.sendFile(path.resolve(__dirname, "client", "build", "index.html"));
  });
}

// Listening to the server
app.listen(port, ip, () => {
  console.log("Server running on port", port);
});