Backend

Backend/.env

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+MONGO_URI=mongodb://localhost:27017/digital-mess-card
+JWT_SECRET=your-secret-key
+PORT=5000

Backend/Server.js

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+const connectDB = require('./config/db');
+
+const express= require('express');
+const cors = require('cors');
+
+
+const authRoutes = require('./routes/auth');
+const scanRoutes= require('./routes/scan');
+
+app.use(corse());
+app.use(express.json());
+
+connectDB();
+
+app.use('/api/auth', authRoutes);
+app.use('/api/scan', scanRoutes);
+require('dotenv').config();
+
+
+app.get('/',(req,res)=>{
+    res.send('Digital MESS Card');      //Route
+});
+
+const PORT= process.env.PORT || 5000;
+app.listen(PORT, () => {
+    console.log(`Server running on http://localhost:${PORT}`);
+});

Backend/config/db.js

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+const mongoose= require('mongoose');
+
+const connectDB = async () => {
+    try {
+        await mongoose.connect(process.env.MONGO_URI, {
+            useNewUrlParser: true,
+            useUnifiedTopology: true
+        });
+        console.log('MongoDB connected');
+    } catch (err) {
+        console.error('MongoDB connection error:', err);
+        process.exit(1);
+    }
+};
+
+module.exports = connectDB;

Backend/controllers/authController.js

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+const bcrypt = require('bcryptjs');
+const jwt = require('jsonwebtoken');
+const User = require('../models/User');
+const { jwtSecret } = require('../config/auth');
+
+exports.register = async (req, res) => {                                       //to register new user
+    const { username, password } = req.body;
+    try {
+        const hashedPassword = await bcrypt.hash(password, 10);
+        const user = new User({ username, password: hashedPassword });
+        await user.save();
+        res.status(201).json({ message: 'User registered successfully' });
+    } catch (err) {
+        res.status(500).json({ error: 'Error registering user' });
+    }
+};
+
+exports.login = async (req, res) => {                                          //Authenticate access
+    const { username, password } = req.body;
+    try {
+        const user= await User.findOne({ username });
+        if (!user || !(await bcrypt.compare(password, user.password))) {       // //to check whether the login details are valid
+            return res.status(400).json({ error: 'Invalid credentials' });
+        }
+        const token= jwt.sign({ userId: user._id }, jwtSecret, { expiresIn: '1h' });
+        res.json({ token });
+    } catch (err) {
+        res.status(500).json({ error: 'Error logging in' });
+    }
+};

Backend/controllers/scanController.js

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+const Scan= require('../models/Scan');
+
+exports.scan= async (req, res) => {         //to get info about user and the current time
+    const { type } = req.body;
+    const userId = req.userId;
+
+    const now = new Date();
+    const hours = now.getHours();
+    const minutes = now.getMinutes();
+
+    if (type === 'lunch' && !(hours >= 11 && minutes >= 30 && hours < 14)) {            //to check whether scanning of lunch time is valid
+        return res.status(400).json({ error: 'Lunch scanning is only allowed between 11:30 AM and 2:00 PM' });
+    }
+
+    if (type === 'snack' && !(hours >= 15 && minutes >= 30 && hours < 17)) {            //to check whether scanning of snack time is valid
+        return res.status(400).json({ error: 'Snack scanning is only allowed between 3:30 PM and 5:00 PM' });
+    }
+
+    try {
+        const existingScan = await Scan.findOne({ userId, type, date: { $gte: new Date().setHours(0, 0, 0, 0) } });
+        if (existingScan) {
+            return res.status(400).json({ error: 'Already scanned today' });             //to check whether a scanning already occured in the given time
+        }
+
+        const scan = new Scan({ userId, type });
+        await scan.save();                                              //to save current scan
+        res.json({ message: 'Scan successful' });                       
+    } catch (err) {
+        res.status(500).json({ error: 'Error processing scan' });
+    }
+};

Backend/middleware/auth.js

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+const jwt= require('jsonwebtoken');
+const { jwtSecret }= require('../config/auth');
+
+exports.authenticate= (req,res,next) => {            
+    const token=req.header('Authorization');
+    if (!token) return res.status(401).json({ error: 'Access denied' });
+
+    try{
+        const decoded= jwt.verify(token, jwtSecret);
+        req.userId= decoded.userId;
+        next();
+    } catch (err) {
+        res.status(400).json({ error: 'Invalid token' });
+    }
+};

Backend/models/Scan.js

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+const mongoose= require('mongoose');
+const scanSchema =new mongoose.Schema({                                     //Scan date update in db
+    userId: { type: mongoose.Schema.Types.ObjectId, ref: 'User', required: true },
+    type: {   type: String, enum: ['lunch', 'snack'], required: true },
+    date :{  type: Date, default: Date.now},
+});
+
+module.exports= mongoose.model('Scan', scanSchema);

Backend/models/User.js

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+const mongoose= require('mongoose');
+
+const userSchema= new mongoose.Schema({                            //login details connected to db
+    username:{ type: String, required: true, unique: true },
+    password:{ type: String, required: true, match:/^[a-zA-Z0-9]+$/,
+    }
+});
+module.exports= mongoose.model('User', userSchema);

Backend/routes/auth.js

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+const express= require('express');
+const { register, login } = require('../controllers/authController');
+
+const router= express.Router();
+
+router.post('/register', register);
+router.post('/login', login);
+
+module.exports = router;

Backend/routes/scan.js

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+const express= require('express');
+const { scan }= require('../controllers/scanController');
+const { authenticate }= require('../middleware/auth');
+
+const router = express.Router();
+
+router.post('/scan', authenticate, scan);
+
+module.exports= router;

README.md

@@ -2,13 +2,13 @@
 
 
 ## Basic Details
-### Team Name: [Name]
+### Team Name: NOX
 
 
 ### Team Members
-- Member 1: [Name] - [College]
-- Member 2: [Name] - [College]
-- Member 3: [Name] - [College]
+- Member 1: Anagha TR - SCMS School of engineering and technology
+- Member 2: Anaya Wilson - SCMS School of engineering and technology
+- Member 3: Aneeja J - SCMS School of engineering and technology
 
 ### Hosted Project Link
 [mention your project hosted project link here]