app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var passport = require('passport');
var GoogleStrategy = require('passport-google-oauth20').Strategy;
var mongoose = require('mongoose');
var session = require('express-session');
var User = require('./models/user.js');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users.js');
var messagesRouter = require('./routes/messages');

var app = express();

// MongoDB connection
mongoose.connect('mongodb+srv://mrwoodring:fCsy2UETxqR5tiCd@cluster0.2rcbnok.mongodb.net/demo_s25?retryWrites=true&w=majority&appName=Cluster0', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
}).then(() => {
  console.log('Connected to MongoDB.');
}).catch((err) => {
  console.error('MongoDB connection error:', err);
});

// setting Session
app.use(session({
  secret: 'your_secret_key',
  resave: false,
  saveUninitialized: false,
}));

// Passport setup
app.use(passport.initialize());
app.use(passport.session());

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

passport.deserializeUser(async (id, done) => {
  const user = await User.findById(id);
  done(null, user);
});

// Google OAuth Strategy
passport.use(new GoogleStrategy({
  clientID: '281560512774-cg341smq1t7hq6s9mhgiq4niitag5ph3.apps.googleusercontent.com',
  clientSecret: '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',
  callbackURL: 'http://localhost:3000/auth/google/callback',
}, async (accessToken, refreshToken, profile, done) => {
  let user = await User.findOne({ googleId: profile.id });
  if (!user) {
    user = await User.create({
      googleId: profile.id,
      username: profile.displayName,
      email: profile.emails?.[0]?.value || '',
    });
  }
  done(null, user);
}));

// View engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// routes
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/messages', messagesRouter);

// 404 handle
app.use(function(req, res, next) {
  next(createError(404));
});

// Error handle
app.use(function(err, req, res, next) {
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;