Template Engine added and Frontend backend separated

.gitignore

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+node_modules

app.js

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+const express = require('express');  // importing express
+const app = express(); // initializing espress in the app
+const path = require('path');
+const fs = require('fs');
+const mongoose = require('mongoose');
+mongoose.set('strictQuery', true);
+const bodyParser = require("body-parser")
+app.use(bodyParser.urlencoded({
+    extended: true
+}));
+// Connecting to mongodb server
+main().catch(err => console.log(err));
+async function main() {
+    await mongoose.connect('mongodb://localhost:27017/edTech');
+}
+const db = mongoose.connection;
+db.on('error', console.error.bind(console, 'connection error:'));
+db.once('open', function () {
+    console.log("\t\t\t\t\t\tWe are connected with Database")
+});
+// Define mongoose schema
+const contactSchema = new mongoose.Schema({
+    email: String,
+    password: String,
+    name: String,
+    age: String,
+    time: String
+});
+const Contact = mongoose.model('edTechprofile', contactSchema);
+const port = 3000;
+
+const nodemailer = require('nodemailer'); // adding mail service
+const { exit } = require('process');
+
+const transporter = nodemailer.createTransport({ // host authentication
+    service: 'gmail',
+    auth: {
+        user: '[email protected]',
+        pass: 'urosqsimfwbflnxg'
+    }
+});
+
+
+//serving static file
+app.use('/servingItems', express.static('servingItems'));
+
+
+// Setting home page
+const home = fs.readFileSync('./templates/index.html');
+
+// set the template engine as pug
+app.set("view engine", 'hbs');
+
+// set the views directory
+app.set('views', path.join(__dirname, 'templates'))
+
+
+app.get('/', (req, res) => {
+    res.status(200).end(home);
+})
+
+//Video Streaming
+app.get('/video', function(req, res){
+    const range = req.headers.range;
+    if(!range){
+        res.status(400).send("Requires Range header");
+    }
+    const videoPath = "./servingItems/static/Video/earth.mp4";
+    const videoSize = fs.statSync(videoPath).size;
+
+    const CHUNK_SIZE = 10**6; //1 MB
+    const start = Number(range.replace(/\D/g, "")); 
+    const end = Math.min(start + CHUNK_SIZE , videoSize-1);
+    const contentLength = end-start+1;
+    const headers = {
+        "Content-Range": `bytes ${start}-${end}/${videoSize}`,
+        "Accept-Ranges": 'bytes',
+        "Content-Length": contentLength,
+        "Content-Type": "video/mp4"
+    }
+    res.writeHead(206,headers);
+    const videoStream = fs.createReadStream(videoPath,{start, end});
+    videoStream.pipe(res);
+
+})
+
+// Serving page on get request
+app.get('/courses', (req, res) => {
+    res.status(200).end(fs.readFileSync('./templates/login.html'))
+    // res.status(200).end(fs.readFileSync('./templates/otpVerify.pug') )
+})
+// app.get('/d', (req, res) => {
+//     app.set("view engine", 'hbs');
+//     app.set('views', path.join(__dirname, 'templates'))
+//     res.status(200).render('dashboard', { username: "Tamal" });
+//     // res.status(200).end(fs.readFileSync('./templates/otpVerify.pug') )
+// })
+
+// Creating temporary sing up varification dictionary 
+let usersVerification = []// initially empty   
+
+// Collecting data at post request
+app.post("/courses", function (req, res) {
+    const user = req.body;
+
+    // console.log(user.clientEmail )
+
+    // res.send("Addition - " + user);
+
+    // Case 1 : New User Sing up // entry = 2
+    if (user.entry == 2) {
+        // Generating 6 digit OTP
+        const otp = Math.floor(Math.random() * (999999 - 100000)) + 100000;
+        //Sending email
+        var mailOptions = {
+            from: '[email protected]',
+            to: `${user.newUserEmail}`,
+            subject: `Congratulations ReLerner `,
+            text: `Dear ${user.newUserName} , your one time password (OTP) for ReLearn sing up is :  ${otp} 
+
+            \n\n\n\n\n\[email protected]`
+        };
+        // sending OTP through email :
+
+        // transporter.sendMail(mailOptions, function(error, info){
+        //     if (error) {
+        //         console.log(error);
+        //     } else {
+        //         console.log('Email sent: ' + info.response);
+        //     }
+        // });
+
+        // storing data in temp dictionery
+        usersVerification.push({
+            email: user.newUserEmail,
+            password: user.newUserPassword,
+            name: user.newUserName,
+            age: user.newUserAge,
+            time: new Date(),
+            otp: otp,
+        });
+        console.table(usersVerification);
+
+        // res.send("New user \n Email : " + user.newUserEmail+"\n Name : "+user.newUserName+"\n Age : "+user.newUserAge);
+        // set the template engine as pug
+
+        res.status(200).render('otpVerify', { email: user.newUserEmail })
+    } else if (user.entry == 1) {// Case 2 : Existing User Sing in // value of entry = 1
+
+        // searching in the database
+        Contact.find({ "email": user.clientEmail, "password": user.clientPassword }).then((result) => {
+            if (result == '') { // Not matched
+                console.log('Not found')
+            } else { // matched
+                loadDashboard(res,result[0]); // loadig dashboard based on the
+            }
+        }).catch(err => {
+            console.log(err)
+        })
+    } else if (user.entry == 3) {// Otp verification case 3 entry=3
+        // console.table(user);
+
+        var otpVerificationFound = compareOtp(user.verifyEmail, user.clientOtp);
+        // console.log("comparing : ",user.verifyEmail,user.clientOtp)
+        // console.log("\t Verrr = " + otpVerificationFound);
+        if (otpVerificationFound != null) {
+            var myData = new Contact(usersVerification[otpVerificationFound]);
+            myData.save().then(() => {
+
+                loadDashboard(res,myData);
+            }).catch(() => {
+                res.status(400).send("Item is not saved in the database")
+            });
+        } else {
+            res.status(404).render('otpVerify', { email: user.verifyEmail, round: `Retry` })
+        }
+    }
+    // console.table('otp ='+usersVerification[0].otp);
+    function loadDashboard(res,result){
+        app.set("view engine", 'hbs');
+                    app.set('views', path.join(__dirname, 'templates'))
+                    res.status(200).render('dashboard', { username: result.name, userage: result.age, useremail: result.email });
+    }
+});
+
+function compareOtp(verifyEmail, clientOtp) {
+    let matched = null;
+    let i = 0;
+    usersVerification.forEach(element => {
+        console.log(element.otp + '=' + clientOtp + '\t' + element.email + "=" + verifyEmail)
+        if (element.otp == clientOtp && element.email == verifyEmail) {
+
+            // Add this user to the database
+            console.log("Email verified for :"); // Database work 
+            console.table(element); // Database work
+
+            console.log("Moved to database so deleting from the temporary file")
+            // usersVerification.Remove(element)
+            //  usersVerification.delete(i); // deleting the
+
+            console.table(usersVerification);
+            matched = i;
+        }
+        i++;
+    });
+    return matched;
+}
+
+const interval = 60 * 10000; // 60 minutes
+
+// function deleteFirstOTP() {
+//         // console.log(usersVerification);
+//         if ((usersVerification[0].time) && (new Date().getTime()-usersVerification[0].time >interval)) {
+//             console.log("Deleting : \n")
+//             console.table(usersVerification[0]);
+//             delete usersVerification[0];
+//         }
+// }
+let item = 0;
+setInterval(() => {
+    delete usersVerification[item];
+    item++;
+}, interval);
+
+// console.log(new Date().getTime()  )
+
+
+
+
+// Server listening at channel :    
+app.listen(port, () => {
+    console.log(`Live on port http://127.0.0.1:${port}`)
+    // console.log(`Jump to demo http://127.0.0.1:${port}/demo`  )
+})
+// console.log(" Modify otpVerificationFound section Problem in var & const & problem in the comparison");