web-protocols/backend/index.js

// Import Express
const express = require('express');
const cors = require('cors');
const http = require('http');
const path = require('path');
const multer = require('multer');
const { Server } = require('socket.io');

const app = express();

let corsOptions = {
    origin : ['*'],
 }
 
 app.use(cors())

 // Configure Multer for file uploads
const upload = multer({
    dest: 'uploads/' // Destination folder for uploaded files
});

// Define a route
app.get('/', (req, res) => {
    res.send('Welcome to the Express.js');
});

// Start the server
app.listen(7777, () => {
    console.log('HTTP is running on port 7777');
});

app.post('/http', upload.single('file'), (req, res) => {
    try {
        if (!req.file) {
            return res.status(400).send({ message: 'No file uploaded' });
        }

        // Log file information (optional)
        console.log('File received:', req.file);

        // Send file back as response
        res.setHeader('Content-Type', req.file.mimetype);
        res.sendFile(path.resolve(req.file.path));
    } catch (err) {
        console.error('Error handling file upload:', err);
        res.status(500).send({ message: 'Error processing file' });
    }
});

const server = http.createServer(app);
const io = new Server(server, {
    cors: {
        origin: '*', // Adjust frontend URL if necessary
        methods: ['GET', 'POST'],
    },
    maxHttpBufferSize: 1e8,
});

io.on('connection', (socket) => {
    console.log('A user connected:', socket.id);

    socket.on('sendFile', (data) => {
        console.log('File received:', data.filename);
        // Echo the file back to the frontend
        socket.emit('receiveFile', data);
    });

    socket.on('disconnect', () => {
        console.log('A user disconnected:', socket.id);
    });
});


server.listen(8888, () => {
    console.log('WS listening on port 8888');
});