first commit

Backend/server.js

@@ -0,0 +1,97 @@
+const express = require('express');
+const http = require('http');
+const { Server } = require('socket.io');
+const cors = require('cors');
+require('dotenv').config();
+
+const app = express();
+const server = http.createServer(app);
+const io = new Server(server, {
+    cors: {
+        origin: '*',
+        methods: ['GET', 'POST']
+    }
+});
+
+const authRoutes = require('./routes/auth');
+const channelRoutes = require('./routes/channels');
+
+app.use(cors());
+app.use(express.json());
+
+app.use('/api/auth', authRoutes);
+app.use('/api/channels', channelRoutes);
+
+app.get('/', (req, res) => {
+    res.send('Secure Chat Backend Running');
+});
+
+const redisClient = require('./redis');
+const db = require('./db');
+
+io.on('connection', (socket) => {
+    console.log('User connected:', socket.id);
+
+    socket.on('join_channel', async (channelId) => {
+        socket.join(channelId);
+        console.log(`User ${socket.id} joined channel ${channelId}`);
+        // Load recent messages
+        try {
+            const result = await db.query(
+                `SELECT m.*, u.username 
+                 FROM messages m 
+                 JOIN users u ON m.sender_id = u.id 
+                 WHERE m.channel_id = $1 
+                 ORDER BY m.created_at DESC LIMIT 50`,
+                [channelId]
+            );
+            socket.emit('recent_messages', result.rows.reverse());
+        } catch (err) {
+            console.error('Error fetching messages:', err);
+        }
+    });
+
+    socket.on('send_message', async (data) => {
+        // data: { channelId, senderId, ciphertext, nonce, signature, keyVersion }
+        const { channelId, senderId, ciphertext, nonce, signature, keyVersion } = data;
+
+        try {
+            // Store in DB
+            const result = await db.query(
+                `INSERT INTO messages (channel_id, sender_id, ciphertext, nonce, signature, key_version)
+                 VALUES ($1, $2, $3, $4, $5, $6) RETURNING id, created_at`,
+                [channelId, senderId, ciphertext, nonce, signature, keyVersion]
+            );
+
+            const message = {
+                id: result.rows[0].id,
+                created_at: result.rows[0].created_at,
+                ...data
+            };
+
+            // Get username for display
+            const userRes = await db.query('SELECT username FROM users WHERE id = $1', [senderId]);
+            if (userRes.rows.length > 0) {
+                message.username = userRes.rows[0].username;
+            }
+
+            // Broadcast to channel
+            io.to(channelId).emit('new_message', message);
+        } catch (err) {
+            console.error('Error saving message:', err);
+        }
+    });
+
+    socket.on('typing', (data) => {
+        socket.to(data.channelId).emit('user_typing', { username: data.username });
+    });
+
+    socket.on('disconnect', () => {
+        console.log('User disconnected:', socket.id);
+    });
+});
+
+const PORT = process.env.PORT || 3000;
+server.listen(PORT, () => {
+    console.log(`Server running on port ${PORT}`);
+});