app.js~

var express = require('express')
var app = express()
var nunjucks  = require('nunjucks');
const port = process.env.PORT || 8000;
//var path = require("path");
//app.use('/public', express.static('public'))
app.use(function(req, res, next) {
    res.setHeader('Author', 'Asmit-Patil')
    next();
  });
var expressMongoDb = require('express-mongo-db');



/**
 * Store database credentials in a separate config.js file
 * Load the file/module and its values
 * For MongoDB, we basically store the connection URL in config file
 */ 



var config = require('./config')
app.use(expressMongoDb(config.database.url));
 
/**
 * setting up the templating view engine
 */ 



var engine = require('consolidate');

app.set('views', __dirname + '/views');
app.engine('html', engine.mustache);
app.set('view engine', 'html')
 
/**
 * import routes/index.js
 * import routes/users.js
 */ 
var index = require('./routes/index')
var users = require('./routes/users')
 
/**
 * Express Validator Middleware for Form Validation
 */ 
var expressValidator = require('express-validator')
app.use(expressValidator())
 
/**
 * body-parser module is used to read HTTP POST data
 * it's an express middleware that reads form's input 
 * and store it as javascript object
 */ 
var bodyParser = require('body-parser')
/**
 * bodyParser.urlencoded() parses the text as URL encoded data 
 * (which is how browsers tend to send form data from regular forms set to POST) 
 * and exposes the resulting object (containing the keys and values) on req.body.
 */ 
app.use(bodyParser.urlencoded({ extended: true }))
app.use(bodyParser.json())
 
 
/**
 * This module let us use HTTP verbs such as PUT or DELETE 
 * in places where they are not supported
 */ 
var methodOverride = require('method-override')
 
/**
 * using custom logic to override method
 * 
 * there are other ways of overriding as well
 * like using header & using query value
 */ 
app.use(methodOverride(function (req, res) {
  if (req.body && typeof req.body === 'object' && '_method' in req.body) {
    // look in urlencoded POST bodies and delete it
    var method = req.body._method
    delete req.body._method
    return method
  }
}))
 

/**
 * This module shows flash messages
 * generally used to show success or error messages
 * 
 * Flash messages are stored in session
 * So, we also have to install and use 
 * cookie-parser & session modules
 */ 
var flash = require('express-flash')
var cookieParser = require('cookie-parser');
var session = require('express-session');
 
app.use(cookieParser('keyboard cat'))
app.use(session({ 
    secret: 'keyboard cat',
    resave: false,
    saveUninitialized: true,
    cookie: { maxAge: 60000 }
}))
app.use(flash())
 
app.use('/', index)
app.use('/users', users)


 



 
app.listen(port, function(){


    console.log(`Server running at port ${port}: http://127.0.0.1:${port}`)
})

module.exports=app;