Disposable Email Detection Database

prepare(
        "SELECT domain, category, risk_level
         FROM disposable_domains
         WHERE domain = :domain"
    );
    $stmt->execute(['domain' => $domain]);
    return $stmt->fetch(PDO::FETCH_ASSOC);
}

// Usage in your registration form handler
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

if (!$email) {
    die('Invalid email address.');
}

$disposable = is_disposable_email($pdo, $email);

if ($disposable) {
    // Block the registration
    die('Please use a permanent email address. Disposable emails are not accepted.');
}

// Email is clean - proceed with registration
create_user($email, $_POST['password']);

import { createClient } from 'redis';
import fs from 'fs';

// One-time: load the AntiProxies CSV into a Redis set
// This gives you O(1) lookups for every registration check

async function loadDisposableDomains(redisClient, csvPath) {
  const data = fs.readFileSync(csvPath, 'utf-8');
  const domains = data.split('\n').slice(1) // skip header
    .map(line => line.split(',')[0].trim().toLowerCase())
    .filter(Boolean);

  // Load all domains into a Redis set
  await redisClient.sAdd('disposable_domains', domains);
  console.log(`Loaded ${domains.length} disposable domains into Redis`);
}

// Check an email during registration
async function isDisposableEmail(redisClient, email) {
  const domain = email.split('@')[1]?.toLowerCase();
  if (!domain) return false;
  return await redisClient.sIsMember('disposable_domains', domain);
}

// Express.js middleware example
app.post('/register', async (req, res) => {
  const { email, password } = req.body;

  if (await isDisposableEmail(redis, email)) {
    return res.status(400).json({
      error: 'Please use a permanent email address.'
    });
  }

  // Proceed with registration...
});