server.js

//Common Importing Statements
const express = require('express')
const bodyParser = require('body-parser');
const mongoose = require('mongoose');
const ejsMate = require('ejs-mate')
const methodOverride = require('method-override')
const path = require("path")
const cookieParser = require("cookie-parser");
const sessions = require('express-session');
const dotenv = require('dotenv')
const flash = require('connect-flash');
const Cryptr = require('cryptr');
const cryptr = new Cryptr('myTotallySecretKey');

//models
const User = require("./models/user");
const Circular = require("./models/circular")
const Constant = require("./models/constant")


//middleware
const { isLoggedIn } = require("./middleware/auth")

//routes
const userRoutes = require('./routes/user')
const circularRoutes = require('./routes/circular')
const notificationRoutes=require('./routes/notification')
const departmentCircular = require('./routes/departmentCircular')

//initilizing
const app = express()
app.use(express.static(path.join(__dirname, "/public")))
app.use(methodOverride('_method'))
app.engine('ejs', ejsMate)
dotenv.config()
app.use(express.json({ extended: true }))
app.use(express.urlencoded({ extended: true }));
app.use(flash());
app.use(methodOverride('_method'))
//session
const oneDay = 1000 * 60 * 60 * 24;
app.use(sessions({
    secret: "webpirates",
    saveUninitialized: true,
    cookie: { maxAge: oneDay },
    resave: false
}));

//constantQuery
const type = ["Civil Engineering", "Mechanical Engineering", "Mechatronics Engineering", "Automobile Engineering", "Chemical Engineering", "Food Technology", "Electrical and Electronics Engineering", "Electronics and Instrumentation Engineering", "Electronics and Communication Engineering", "Computer Science and Engineering", "Information Technology", "Computer Science and Design", "Artificial Intelligence (AIML & AIDS)", "Management Studies", "Computer Application", "Computer Technology - UG", "Computer Technology - PG", "Mathematics", "Physics", "Chemistry", "English"]

//locals
app.use(async (req, res, next) => {
    //const deptt= new Constant({dept:type});
    //await deptt.save()
    console.log(req.session.dept);
    res.locals.success=req.flash('success');
    res.locals.error=req.flash('error');
    res.locals.currentUser = req.session._id;
    res.locals.dept = req.session.dept;

    next()
})

app.set('view engine', 'ejs');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());

//db connection
mongoose.connect(process.env.DB).then(() => {
    console.log('Db connection open')
}).catch(err => {
    console.log(err.message, 'oops err');
});


//session variable
var session; //to make variable available in all place


//home routes
app.get("/", async(req, res) => {
    session = req.session;
    if (session._id) {
        const user = await User.findById(session._id)
        if(user.isAdmin){
            return res.redirect(`/circular/all/web/${user.department}/${user.batch}/${user.type}`)
        }else{
            return res.redirect(`/dept/all/web/${user.department}/${user.batch}/${user.type}`)
        }
    }
    else {
        req.flash("success","Hii")
        res.render('auth_page/login')
    }

})

//routers
app.use('/user', userRoutes)
app.use('/circular', circularRoutes)
app.use('/api',notificationRoutes)
app.use('/dept',departmentCircular)

app.get('/:id/secured',async(req,res)=>{
    try{
        const {id} = req.params
        const decryptedUrl = await cryptr.decrypt(id);
        console.log('decrypted url');
        console.log(decryptedUrl);
        const circular =await Circular.findOne({filePath:decryptedUrl})
        res.redirect(`/circular/hash/${circular._id}`);
    }catch(e){
        console.log(e);
    }
})

//listening port
//port
const PORT = process.env.PORT || 3000
app.listen(PORT, () => {
    console.log(`Server is running at Port ${PORT}`)
}
)