web_monitor.py

import requests
import hashlib
import time
from datetime import datetime

# The URL we are surveilling
# For testing, we'll use a site that shows the current time (so it changes every minute)
TARGET_URL = "https://www.google.com" 

LOG_FILE = "web_changes.log"

def get_page_hash(url):
    """Fetches the page and returns a unique 'fingerprint' of its content."""
    try:
        response = requests.get(url, timeout=10)
        # We use SHA-256 to create a 64-character 'fingerprint' of the text
        return hashlib.sha256(response.text.encode('utf-8')).hexdigest()
    except Exception as e:
        print(f"[!] Error fetching {url}: {e}")
        return None

def log_change(url):
    """Logs when a change is detected on the target website."""
    timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    with open(LOG_FILE, "a") as f:
        f.write(f"[{timestamp}] WEB ALERT: Change detected on {url}\n")

def monitor_website():
    print(f"--- Web Content Surveillance Started ---")
    print(f"--- Monitoring: {TARGET_URL} ---")
    
    # Get the initial 'fingerprint' of the page
    current_hash = get_page_hash(TARGET_URL)
    
    if not current_hash:
        print("Failed to get initial fingerprint. Check your connection.")
        return

    print(f"Initial Fingerprint: {current_hash[:10]}...")

    try:
        while True:
            time.sleep(30) # Check every 30 seconds
            
            new_hash = get_page_hash(TARGET_URL)
            
            if new_hash and new_hash != current_hash:
                print(f"\n[!!!] CHANGE DETECTED on {TARGET_URL}")
                print(f"    Old Fingerprint: {current_hash[:10]}...")
                print(f"    New Fingerprint: {new_hash[:10]}...")
                
                log_change(TARGET_URL)
                
                # Update the fingerprint so we can catch the NEXT change
                current_hash = new_hash
            else:
                print(f"[{datetime.now().strftime('%H:%M:%S')}] No changes detected.")
                
    except KeyboardInterrupt:
        print("\nWeb monitoring stopped.")

if __name__ == "__main__":
    monitor_website()