Frontend1

Backend/.env

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

Backend/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# vitepress build output
+**/.vitepress/dist
+
+# vitepress cache directory
+**/.vitepress/cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

Backend/app.js

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+require('dotenv').config();
+const express= require('express');
+const app = express();
+const cors = require('cors');
+const connectDB = require('./config/db');
+
+const authRoutes = require('./routes/auth');
+const scanRoutes= require('./routes/scan');
+
+app.use(cors());
+app.use(express.json());
+
+connectDB();
+
+app.use('/api/auth', authRoutes);
+app.use('/api/scan', scanRoutes);
+
+
+
+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);
+        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 = process.env.JWT_SECRET;
+
+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 = process.env.JWT_SECRET;
+
+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);