app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

const flash = require('connect-flash');
const session = require('express-session');
const mongoose = require('mongoose');
const passport = require('passport');

var authRouter = require('./routes/auth');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();

// DB Config
const db = require('./config/keys').mongoURI;

// Connect to MongoDB
mongoose.connect(db, { useNewUrlParser: true }).then(() =>
	console.log('MongoDB Connected')
).catch(err => console.log(err));

// Passport Config
require('./config/passport_strategy')(passport);
require('./config/passport_google_strategy')(passport);


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


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')));
app.use("/node_modules", express.static(path.join(__dirname, 'node_modules')));

// Express session
app.use(
	session({
		secret: 'secret',
		resave: true,
		saveUninitialized: true
	})
);

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

// Connect flash
app.use(flash());
app.use(function (req, res, next) {
	res.locals.error_msg = req.flash('error_msg');
	res.locals.success_msg = req.flash('success_msg'),
	res.locals.errors = req.flash('error');
	/** If logged in */
	res.locals.user = req.user;
	next();
});

app.use('/', authRouter);
app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
	next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
	// set locals, only providing error in development
	res.locals.message = err.message;
	res.locals.error = req.app.get('env') === 'development' ? err : {};

	// render the error page
	res.status(err.status || 500);
	res.render('error');
});

module.exports = app;