app.js

//jshint esversion
require('dotenv').config();
const express = require("express");
const bodyParser = require("body-parser");
const ejs = require("ejs");
let favicon = require("express-favicon");
const mongoose = require("mongoose");
const session = require('express-session');
const passport = require("passport");
const passPortLocalMongoose = require("passport-local-mongoose");
const GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;
const findOrCreate = require('mongoose-findorcreate');


const app = express();

app.use(express.static("public"));
app.use(favicon(__dirname + '/public/favicon.png'));
app.set('view engine', 'ejs');
app.use(bodyParser.urlencoded({ extended: true }));

app.use(session({
    secret: 'Our little secret',
    resave: false,
    saveUninitialized: false
}));

app.use(passport.initialize());
app.use(passport.session());

// mongoose.connect("mongodb://localhost:27017/userDB", { useNewUrlParser: true, useUnifiedTopology: true }); //To run on Local Host
const dbPassword = process.env.CLUSTER_PASSWORD;
mongoose.connect("mongodb+srv://admin-payal:" + dbPassword + "@cluster0.ifcel.mongodb.net/usereDB", { useNewUrlParser: true, useUnifiedTopology: true });
mongoose.set('useCreateIndex', true);

const userSchema = new mongoose.Schema({
    email: String,
    password: String,
    googleId: String,
    secret: String
});
userSchema.plugin(passPortLocalMongoose);
userSchema.plugin(findOrCreate);

const User = new mongoose.model("User", userSchema);

passport.serializeUser(function (user, done) {
    done(null, user.id);
});

passport.deserializeUser(function (id, done) {
    User.findById(id, function (err, user) {
        done(err, user);
    });
});

//Configuration Google
passport.use(new GoogleStrategy({
    clientID: process.env.CLIENT_ID,
    clientSecret: process.env.CLIENT_SECRET,
    callbackURL: "http://localhost:3000/auth/google/secrets",
    userProfileURL: "https://www.googleapis.com/oauth2/v3/userinfo"
},
    function (token, tokenSecret, profile, done) {
        User.findOrCreate({ googleId: profile.id }, function (err, user) {
            return done(err, user);
        });
    }
));

app.get("/", function (req, res) {
    res.render("home");
});

app.get('/auth/google',
    passport.authenticate('google', { scope: ["profile"] }));

app.get('/auth/google/secrets',
    passport.authenticate('google', { failureRedirect: '/login' }),
    function (req, res) {
        res.redirect('/secrets');
    });

app.get("/login", function (req, res) {
    res.render("login");
});

app.get("/register", function (req, res) {
    res.render("register");
});

app.get("/secrets", function (req, res) {
    User.find({ "secret": { $ne: null } }, function (err, foundUsers) {
        if (err) {
            console.log(err);
        } else {
            if (foundUsers) {
                res.render("secrets", { usersWithSecrets: foundUsers });
            }
        }
    });
});

app.get("/submit", function (req, res) {
    if (req.isAuthenticated()) {
        res.render("submit");
    } else {
        res.redirect("/login");
    }
});

app.post("/submit", function (req, res) {
    const submittedSecret = req.body.secret;
    User.findById(req.user.id, function (err, foundUser) {
        if (err) {
            console.log(err);
        } else {
            if (foundUser) {
                foundUser.secret = submittedSecret;
                foundUser.save(function () {
                    res.redirect("/secrets");
                });
            }
        }
    });

});

app.get("/logout", function (req, res) {
    req.logOut();
    res.redirect("/");
});

app.post("/register", function (req, res) {
    User.register({ username: req.body.username }, req.body.password, function (err, user) {
        if (err) {
            console.log(err);
            res.redirect("/register");
        } else {
            passport.authenticate("local")(req, res, function () {
                res.redirect("/secrets");
            });
        }
    });
});

app.post("/login", function (req, res) {
    const user = new User({
        username: req.body.username,
        password: req.body.password
    });
    req.login(user, function (err) {
        if (err) {
            console.log(err);
        } else {
            passport.authenticate("local")(req, res, function () {
                res.redirect("/secrets");
            })
        }
    })
})


app.listen(process.env.PORT || 3000, function () {
    console.log("server is running Succesfully")
});