init

backend/.env.example

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+# Server Configuration
+PORT=3001
+NODE_ENV=development
+
+# Email Configuration
+SMTP_HOST=smtp.mail.me.com
+SMTP_PORT=587
+SMTP_USER=your-email@me.com
+SMTP_PASS=your-app-specific-password
+SMTP_FROM=your-email@me.com
+SMTP_TO=your-email@me.com
+
+# Security
+CORS_ORIGIN=https://knck.pl
+RATE_LIMIT_WINDOW_MS=900000  # 15 minutes
+RATE_LIMIT_MAX_REQUESTS=5    # 5 requests per window 

backend/Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production
+
+# Copy source code
+COPY . .
+
+# Expose port
+EXPOSE 3001
+
+# Start the application
+CMD ["npm", "start"] 

backend/package.json

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+{
+  "name": "knck-contact-backend",
+  "version": "1.0.0",
+  "description": "Contact form backend for knck.pl",
+  "main": "src/index.js",
+  "type": "module",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "nodemon src/index.js"
+  },
+  "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.5",
+    "express": "^4.18.3",
+    "express-rate-limit": "^7.1.5",
+    "helmet": "^7.1.0",
+    "nodemailer": "^6.9.11"
+  },
+  "devDependencies": {
+    "nodemon": "^3.1.0"
+  }
+} 

backend/src/index.js

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+import express from 'express';
+import cors from 'cors';
+import helmet from 'helmet';
+import rateLimit from 'express-rate-limit';
+import dotenv from 'dotenv';
+import nodemailer from 'nodemailer';
+
+// Load environment variables
+dotenv.config();
+
+const app = express();
+const port = process.env.PORT || 3001;
+
+// Middleware
+app.use(helmet());
+app.use(express.json());
+app.use(cors({
+  origin: process.env.CORS_ORIGIN,
+  methods: ['POST']
+}));
+
+// Rate limiting
+const limiter = rateLimit({
+  windowMs: parseInt(process.env.RATE_LIMIT_WINDOW_MS) || 900000, // 15 minutes
+  max: parseInt(process.env.RATE_LIMIT_MAX_REQUESTS) || 5 // 5 requests per window
+});
+app.use('/api/contact', limiter);
+
+// Email transporter setup
+const transporter = nodemailer.createTransport({
+  host: process.env.SMTP_HOST,
+  port: parseInt(process.env.SMTP_PORT),
+  secure: false,
+  auth: {
+    user: process.env.SMTP_USER,
+    pass: process.env.SMTP_PASS
+  }
+});
+
+// Contact form endpoint
+app.post('/api/contact', async (req, res) => {
+  try {
+    const { name, email, message } = req.body;
+
+    // Validate input
+    if (!name || !email || !message) {
+      return res.status(400).json({ error: 'Missing required fields' });
+    }
+
+    // Email content
+    const mailOptions = {
+      from: process.env.SMTP_FROM,
+      to: process.env.SMTP_TO,
+      subject: `New Contact Form Submission from ${name}`,
+      text: `
+Name: ${name}
+Email: ${email}
+
+Message:
+${message}
+      `,
+      html: `
+<h2>New Contact Form Submission</h2>
+<p><strong>Name:</strong> ${name}</p>
+<p><strong>Email:</strong> ${email}</p>
+<p><strong>Message:</strong></p>
+<p>${message.replace(/\n/g, '<br>')}</p>
+      `
+    };
+
+    // Send email
+    await transporter.sendMail(mailOptions);
+
+    res.status(200).json({ message: 'Email sent successfully' });
+  } catch (error) {
+    console.error('Error sending email:', error);
+    res.status(500).json({ error: 'Failed to send email' });
+  }
+});
+
+// Health check endpoint
+app.get('/health', (req, res) => {
+  res.status(200).json({ status: 'ok' });
+});
+
+// Start server
+app.listen(port, () => {
+  console.log(`Server running on port ${port}`);
+});