app.js

var express = require('express');
//var logger = require('morgan');
var cookieParser = require('cookie-parser')
var app = express();
//Valid color Names
var CSS = ["aliceblue","antiquewhite","aqua","aquamarine","azure","beige","bisque","black","blanchedalmond","blue","blueviolet","brown","burlywood","cadetblue","chartreuse","chocolate","coral","cornflowerblue","cornsilk","crimson","cyan","darkblue","darkcyan","darkgoldenrod","darkgray","darkgrey","darkgreen","darkkhaki","darkmagenta","darkolivegreen","darkorange","darkorchid","darkred","darksalmon","darkseagreen","darkslateblue","darkslategray","darkslategrey","darkturquoise","darkviolet","deeppink","deepskyblue","dimgray","dimgrey","dodgerblue","firebrick","floralwhite","forestgreen","fuchsia","gainsboro","ghostwhite","gold","goldenrod","gray","grey","green","greenyellow","honeydew","hotpink","indianred","indigo","ivory","khaki","lavender","lavenderblush","lawngreen","lemonchiffon","lightblue","lightcoral","lightcyan","lightgoldenrodyellow","lightgray","lightgrey","lightgreen","lightpink","lightsalmon","lightseagreen","lightskyblue","lightslategray","lightslategrey","lightsteelblue","lightyellow","lime","limegreen","linen","magenta","maroon","mediumaquamarine","mediumblue","mediumorchid","mediumpurple","mediumseagreen","mediumslateblue","mediumspringgreen","mediumturquoise","mediumvioletred","midnightblue","mintcream","mistyrose","moccasin","navajowhite","navy","oldlace","olive","olivedrab","orange","orangered","orchid","palegoldenrod","palegreen","paleturquoise","palevioletred","papayawhip","peachpuff","peru","pink","plum","powderblue","purple","red","rosybrown","royalblue","saddlebrown","salmon","sandybrown","seagreen","seashell","sienna","silver","skyblue","slateblue","slategray","slategrey","snow","springgreen","steelblue","tan","teal","thistle","tomato","turquoise","violet","wheat","white","whitesmoke","yellow","yellowgreen"];

//set up handlebars view engine
var handlebars = require('express-handlebars').create({
    defaultLayout:'main',
    helpers: {
        debug: function(){
            console.log("Current Context");
            console.log("=================");
            console.log(this);
            return null
        },
        section: function(name, options){
            if(!this._sections) this._sections = {};
            this._sections[name] = options.fn(this);
            return null;
        }
    }
});

app.engine('handlebars', handlebars.engine);
app.set('view engine', 'handlebars');
//app.use(logger('dev'));
app.set('port', process.env.PORT || 3018);
app.use(cookieParser());

app.get('*', function(req, res){
    // res.render('home');
  var cookie = req.cookies;
  if(cookie.bgcolor==undefined){
    if(req.query.color!=undefined && CSS.includes(req.query.color.toLowerCase())){
    res.cookie('bgcolor',req.query.color, { maxAge: 900000, httpOnly: true });
    console.log("New Cookie Baked");
    res.render('home',{color:req.query.color});
    }
  }
  else {
    if (req.query.color!=undefined && CSS.includes(req.query.color.toLowerCase())){
    res.cookie('bgcolor',req.query.color, { maxAge: 900000, httpOnly: true });
    console.log("re-baking cookie with newer color");
    res.render('home',{color:req.query.color});
    }
    else{
      console.log("using existing cookie for bg color");
      res.render('home',{color:req.cookies.bgcolor});
    }
  }
});
//custom 404 page
app.use(function(req, res){
    res.status(404);
    res.render('404');
});

//custom 500 page
app.use(function(err, req, res, next){
    res.status(500);
    res.send(err.stack);
});

app.listen(app.get('port'), function(){
    console.log('Express started on http://localhost:' + app.get('port') + '; press Ctrl-C to terminate.');
});