Check for expired lab links

.templates/script.py

@@ -10,6 +10,10 @@
 proxies = {'http': 'http://127.0.0.1:8080', 'https': 'http://127.0.0.1:8080'}
 
 
+def check_expired_lab(client, host):
+    return client.get(host).status_code == 504
+
+
 def main():
     print('[+] <LAB_NAME>')
     try:
@@ -23,6 +27,10 @@ def main():
         client.verify = False
         client.proxies = proxies
 
+        if check_expired_lab(client, host):
+            print(f'[-] Lab is expired, please provide new link')
+            sys.exit(-2)
+
         # I had some times issues getting the proper result, so wait briefly before checking
         time.sleep(2)
         if 'Congratulations, you solved the lab!' not in client.get(f'{host}').text: