app.js

const express = require("express"),
    app = express(),
    bodyParser = require("body-parser"),
    mongoose = require("mongoose"),
    passport = require("passport"),
    LocalStrategy = require("passport-local"),
    authRoutes = require("./routes/index"),
    listUsersRoutes = require("./routes/listusers"),
    opCenterRoutes = require("./routes/opcenter"),
    userRoutes = require("./routes/user.js"),
    calendarRoutes = require("./routes/calendar.js"),
    flash = require("connect-flash"),
    session = require('express-session'),
    cookieParser = require("cookie-parser"),
    favicon = require('serve-favicon'),
    path = require('path'),
    Config = require("./models/settings"),
    Lodash = require("lodash");

const NODE_PORT = process.env.NODE_PORT || 3000;
const MONGO_IP = process.env.MONGO_IP || 'localhost';
const MONGO_PORT = process.env.MONGO_PORT || '27017';
const PASSPORT_SECRET = process.env.PASSPORT_SECRET || 'Im_dumb_and_didnt_set_my_passport_secret';

mongoose.connect("mongodb://" + MONGO_IP + ':' + MONGO_PORT + "/persman", {useNewUrlParser: true, useUnifiedTopology: true});
app.use(bodyParser.urlencoded({extended: true}));
mongoose.set('useFindAndModify', false);
app.set("view engine", "ejs");
app.use(express.static('public'));
app.use(cookieParser('secret'));
app.use(favicon(path.join(__dirname, '.', 'public', 'favicon.ico')));

//PASSPORT
app.use(require("express-session")({
    secret: PASSPORT_SECRET,
    resave: false,
    saveUninitialized: false
}));

Config.find({}, function(err, result) {
    if (err) throw err;
    
    const defaultConfig = require("./default-settings.json");
    if (result.length == 0) {
        let DefaultConfig = new Config(defaultConfig);
        DefaultConfig.save();

        Start(DefaultConfig);
    } else {
        let config = result[0];
        
        if (Object.keys(defaultConfig).length !== Object.keys(config._doc).length-2) {
            let oldConfigDoc = Lodash.cloneDeep(config._doc);
            delete oldConfigDoc._id;
            delete oldConfigDoc.__v;

            Config.findByIdAndDelete(config._id, function(err, result) {
                if (err) throw err; 
                
                let newConfig = Object.assign(defaultConfig, oldConfigDoc)
                config = new Config(newConfig);
                config.save();

                Start(config);
            })
        } else {
            Start(config);
        }
    }
});

function Start(config) {
    let User = require("./models/user")(config);

    app.use(flash());
    app.use(passport.initialize());
    app.use(passport.session());
    passport.use(new LocalStrategy(User.authenticate()));
    passport.serializeUser(User.serializeUser());
    passport.deserializeUser(User.deserializeUser());
    
    app.use(function(req, res, next){
        res.locals.config = config;
        res.locals.currentUser = req.user;
        res.locals.success = req.flash('success');
        res.locals.error = req.flash('error');
        next();
    });

    app.use(authRoutes);
    app.use(listUsersRoutes);
    app.use(opCenterRoutes);
    app.use(userRoutes);
    app.use(calendarRoutes);

    // catch 404 and forward to error handler
    app.use(function(req, res, next) {
        res.status(404).render('404');
    });
    
    app.listen(NODE_PORT, function(){
        console.log("PERSMAN: ONLINE") ;
    });
}