added check letsencrypt certificate

cert_email.py

@@ -0,0 +1,84 @@
+import ssl
+import socket
+import datetime
+import smtplib
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
+
+def check_certificate_expiry(url, days_threshold=20):
+    """Checks if a website's SSL certificate expires within the given threshold."""
+    try:
+        hostname = url.split('//')[-1].split('/')[0]  # Extract hostname
+        port = 443  # Default HTTPS port
+
+        context = ssl.create_default_context()
+        with socket.create_connection((hostname, port)) as sock:
+            with context.wrap_socket(sock, server_hostname=hostname) as ssock:
+                cert = ssock.getpeercert()
+
+        expiry_date_str = cert['notAfter']
+        expiry_date = datetime.datetime.strptime(expiry_date_str, '%b %d %H:%M:%S %Y %Z')
+        now = datetime.datetime.utcnow()
+        time_remaining = expiry_date - now
+        
+        if time_remaining.days <= days_threshold:
+            return url, expiry_date
+        else:
+            return None, None
+    except (socket.gaierror, ConnectionRefusedError, ssl.SSLError, ValueError, IndexError) as e:  # Handle potential errors
+        print(f"Error checking {url}: {e}")
+        return None, None
+
+
+def send_email(expired_certs, recipient_email="user@example.com", sender_email="your_email@example.com", sender_password="your_password"):
+    """Sends an email with the list of expiring certificates."""
+
+    if not expired_certs:  # Check if expired_certs is empty
+        print("No certificates expiring soon.")
+        return
+
+    message = MIMEMultipart()
+    message['From'] = sender_email
+    message['To'] = recipient_email
+    message['Subject'] = "Expiring SSL Certificates"
+
+    email_body = "The following certificates are expiring soon:\n\n"
+    for url, expiry_date in expired_certs:
+        email_body += f"URL: {url}\nExpiry Date: {expiry_date}\n\n"
+
+    message.attach(MIMEText(email_body, 'plain'))
+
+    try:
+        with smtplib.SMTP_SSL('smtp.gmail.com', 465) as server:  # Example using Gmail, adjust as needed
+            server.login(sender_email, sender_password)
+            server.sendmail(sender_email, recipient_email, message.as_string())
+        print("Email sent successfully.")
+    except Exception as e:
+        print(f"Error sending email: {e}")
+
+
+
+def main():
+    """Reads URLs from a file, checks certificates, and sends an email."""
+
+    try:
+        with open("urls.txt", "r") as f:  # Replace "urls.txt" with your file name
+            urls = [line.strip() for line in f]
+    except FileNotFoundError:
+        print("urls.txt file not found. Please create this file with your urls")
+        return
+
+    expiring_certificates = []
+    for url in urls:
+        url_with_protocol = url if url.startswith("http://") or url.startswith("https://") else "https://" + url
+        url_with_protocol = url_with_protocol.split("#")[0] #remove anchor links if present
+
+        checked_url, expiry_date = check_certificate_expiry(url_with_protocol)
+        if checked_url:
+            expiring_certificates.append((checked_url, expiry_date))
+
+    send_email(expiring_certificates)
+
+
+if __name__ == "__main__":
+    main()