Website Monitoring
Visual Change Detection via Screenshots

import requests
import hashlib
import os

TARGETS = [
    'https://competitor.com/pricing',
    'https://yoursite.com/landing',
    'https://partner.com/status',
]

def take_screenshot(url):
    resp = requests.post('https://api.snaprender.dev/v1/screenshot',
        headers={'Authorization': 'Bearer YOUR_KEY'},
        json={'url': url, 'full_page': True, 'width': 1280})
    return resp.content

def check_for_changes(url, screenshot):
    slug = url.replace('https://', '').replace('/', '_')
    hash_file = f'/tmp/monitor_{slug}.hash'
    current_hash = hashlib.sha256(screenshot).hexdigest()

    if os.path.exists(hash_file):
        with open(hash_file) as f:
            old_hash = f.read().strip()
        if old_hash != current_hash:
            send_alert(url, screenshot)  # Your alert function

    with open(hash_file, 'w') as f:
        f.write(current_hash)

for url in TARGETS:
    img = take_screenshot(url)
    check_for_changes(url, img)

import crypto from 'crypto';
import fs from 'fs';

const TARGETS = [
  'https://competitor.com/pricing',
  'https://yoursite.com/landing',
  'https://partner.com/status',
];

async function takeScreenshot(url) {
  const res = await fetch('https://api.snaprender.dev/v1/screenshot', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer YOUR_KEY',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({ url, full_page: true, width: 1280 }),
  });
  return Buffer.from(await res.arrayBuffer());
}

async function monitor() {
  for (const url of TARGETS) {
    const screenshot = await takeScreenshot(url);
    const hash = crypto.createHash('sha256').update(screenshot).digest('hex');
    const slug = url.replace('https://', '').replace(/\//g, '_');
    const hashFile = `/tmp/monitor_${slug}.hash`;

    if (fs.existsSync(hashFile)) {
      const oldHash = fs.readFileSync(hashFile, 'utf8').trim();
      if (oldHash !== hash) {
        console.log(`Change detected: ${url}`);
        // Send alert via Slack, email, webhook, etc.
      }
    }
    fs.writeFileSync(hashFile, hash);
  }
}

monitor();
// Run with: cron "*/30 * * * * node monitor.js"