A Simple Demo using Google reCAPTCHA with Express, lovingly coaxed out of GPT4o with a heavy hand.

recaptcha-express-gpt.js

const express = require('express');
const AsyncRouter = require('@root/async-router');
const fetch = require('node-fetch'); // For making external API requests

const app = AsyncRouter.Router();

// Secret key for reCAPTCHA
const RECAPTCHA_SECRET_KEY = 'YOUR_SECRET_KEY';

app.post('/api/process-payment', async (req, res) => {
  const { captcha, creditcard } = req.body;

  if (!captcha) {
    const error = new Error('CAPTCHA token is missing');
    error.status = 400;
    error.code = 'CAPTCHA_MISSING';
    throw error;
  }

  // Verify the CAPTCHA with Google
  const verifyUrl = `https://www.google.com/recaptcha/api/siteverify?secret=${RECAPTCHA_SECRET_KEY}&response=${captcha}`;
  
  const response = await fetch(verifyUrl, { method: 'POST' });
  const captchaResult = await response.json();

  if (!captchaResult.success) {
    const error = new Error('CAPTCHA verification failed');
    error.status = 403;
    error.code = 'CAPTCHA_FAILED';
    throw error;
  }

  // Call your payment processing logic here, e.g.:
  const paymentResult = processPayment(creditcard);

  if (!paymentResult) {
    const error = new Error('Payment failed');
    error.status = 402;
    error.code = 'PAYMENT_FAILED';
    throw error;
  }

  return res.json({ success: true, message: 'Payment processed successfully' });
});

// Payment processing function (replace with actual logic)
function processPayment(creditcard) {
  // Add your payment processing logic here
  return true; // Return true if payment is successful, false otherwise
}

// Global Error Handler
app.use(function async (err, req, res, next) {
  res.status(err.status || 500);
  res.json({
    message: err.message,
    code: err.code || 'INTERNAL_SERVER_ERROR',
    status: err.status || 500,
  });
});

// Start server
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});