index.js

if (process.env.NODE_ENV !== 'production') {
    require('dotenv').config();
}
console.log(process.env.CLOUDINARY_CLOUD_NAME);

const express = require('express');
const path = require('path');
const mongoose = require('mongoose');
const methodOverride = require('method-override');
const ejsMate = require('ejs-mate');
const session = require('express-session');
const flash = require('connect-flash');

const ExpressError = require('./utilities/expressError');

const passport = require('passport');
const LocalStrategy = require('passport-local');
const User = require('./models/user');

const helmet = require('helmet');

const mongoSanitize = require('express-mongo-sanitize');

const userRoutes = require('./routes/users');
const campgroundRoutes = require('./routes/campgrounds');
const reviewRoutes = require('./routes/reviews');

const MongoDBStore = require("connect-mongo");

const dbUrl = process.env.DB_URL || 'mongodb://localhost:27017/yelp-camp';

mongoose.connect(dbUrl);

const db = mongoose.connection;
db.on("error", console.error.bind(console, "ohh, No! Database connection error:"));
db.once("open", () => {
    console.log("Hello, our DataBase is now connected :)");
});

const app = express();

app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'))
app.engine('ejs', ejsMate)

app.use(express.urlencoded({ extended: true }));
app.use(methodOverride('_method'));
app.use(express.static(path.join(__dirname, 'public')));

app.use(mongoSanitize({
    replaceWith: '_'
}))

const secret = process.env.SECRET || 'this-is-not-a-secret-though!';

const store = MongoDBStore.create({
    mongoUrl: dbUrl,
    secret,
    touchAfter: 24 * 60 * 60 //time in seconds
});

store.on("error", function (e) {
    console.log("SESSION STORE ERROR", e)
})

const sessionConfig = {
    store,
    name: 'sagarSession',
    secret,
    resave: false,
    saveUninitialized: true,
    cookie: {
        httpOnly: true,
        expires: Date.now() + 1000 * 60 * 60 * 24 * 7, //time in milli seconds
        maxAge: 1000 * 60 * 60 * 24 * 7 //time in milli seconds
    }
}

app.use(session(sessionConfig));
app.use(flash());
app.use(helmet({ crossOriginEmbedderPolicy: false }));


const scriptSrcUrls = [
    "https://stackpath.bootstrapcdn.com/",
    "https://api.tiles.mapbox.com/",
    "https://api.mapbox.com/",
    "https://kit.fontawesome.com/",
    "https://cdnjs.cloudflare.com/",
    "https://cdn.jsdelivr.net",
];
const styleSrcUrls = [
    "https://kit-free.fontawesome.com/",
    "https://cdn.jsdelivr.net/npm/",
    "https://stackpath.bootstrapcdn.com/",
    "https://api.mapbox.com/",
    "https://api.tiles.mapbox.com/",
    "https://fonts.googleapis.com/",
    "https://use.fontawesome.com/",
];
const connectSrcUrls = [
    "https://api.mapbox.com/",
    "https://a.tiles.mapbox.com/",
    "https://b.tiles.mapbox.com/",
    "https://events.mapbox.com/",
];
const fontSrcUrls = [];
app.use(
    helmet.contentSecurityPolicy({
        directives: {
            defaultSrc: [],
            connectSrc: ["'self'", ...connectSrcUrls],
            scriptSrc: ["'unsafe-inline'", "'self'", ...scriptSrcUrls],
            styleSrc: ["'self'", "'unsafe-inline'", ...styleSrcUrls],
            workerSrc: ["'self'", "blob:"],
            objectSrc: [],
            imgSrc: [
                "'self'",
                "blob:",
                "data:",
                "https://res.cloudinary.com/sagar-d/image/upload/",
                "https://images.unsplash.com/",
                // "https://img.icons8.com/color/2x/camping-tent.png"
            ],
            fontSrc: ["'self'", ...fontSrcUrls],
        },
    })
);

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) => {
    //Express runs the code in this section, everytime, we hit any route.
    res.locals.currentUser = req.user;
    // We have access to 'currentUser', in views directory 
    res.locals.success = req.flash('success');
    res.locals.error = req.flash('error');
    next();
})

app.use('/', userRoutes);
app.use('/campgrounds', campgroundRoutes);
app.use('/campgrounds/:id/reviews', reviewRoutes);

app.get('/', (req, res) => {
    res.render('home')
});


app.all('*', (req, res, next) => {
    next(new ExpressError('Page Not Found', 404))
});

app.use((err, req, res, next) => {
    const { statusCode = 500 } = err;
    if (!err.message) err.message = 'Oh No, Something Went Wrong!'
    res.status(statusCode).render('error', { err })
});

const port = process.env.PORT || 3000;
app.listen(port, () => {
    console.log(`Howdy, we are serving on port ${port} :)`)
})