app.js

require('dotenv').config();
const express = require("express");
const bodyParser = require("body-parser");
const ejs = require("ejs");
const mongoose = require('mongoose');
const session = require('express-session');
const passport = require('passport');
const passportLocalMongoose = require('passport-local-mongoose');
const GoogleStrategy = require('passport-google-oauth20').Strategy;
const findOrCreate = require('mongoose-findorcreate');
// const FacebookStrategy = require("passport-facebook");

const app = express();

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

app.use(session({
  secret: "MySecretIsALittleHigh.",
  resave: false,
  saveUninitialized: false
}));

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

mongoose.connect("mongodb://localhost:27017/userDB", {
  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 = mongoose.model("User", userSchema);

passport.use(User.createStrategy());

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

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

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

// passport.use(new FacebookStrategy({
//     clientID: process.env.FACEBOOK_APP_ID,
//     clientSecret: process.env.FACEBOOK_APP_SECRET,
//     callbackURL: "http://localhost:3000/auth/facebook/secret",
//     profileFields: ['profile']
//   },
//   function(accessToken, refreshToken, profile, cb) {
//     User.findOrCreate({
//       facebookId: profile.id
//     }, function(err, user) {
//       return cb(err, user);
//     });
//   }
// ));


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

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

app.get("/auth/google/secret",
  passport.authenticate('google', {
    failureRedirect: "/login"
  }),
  function(req, res) {
    // Successful authentication, redirect to Secrets page.
    res.redirect("/secrets");
  });

// app.get('/auth/facebook',
//   passport.authenticate('facebook', {
//     scope: ["profile"]
//   }));
//
// app.get('/auth/facebook/secret',
//   passport.authenticate('facebook', {
//     failureRedirect: '/login'
//   }),
//   function(req, res) {
//     // Successful authentication, redirect to Secrets page.
//     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, foundUser) {
    if (err) {
      console.log(err);
    } else {
      if (foundUser) {
        res.render("secrets", {
          usersWithSecrets: foundUser
        });
      }
    }
  });
});

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;
  console.log(req.user);
  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(3000, function() {
  console.log("Server started on port 3000.");
});