Blocking server also blocks subdomains

app/utils/url.py

@@ -54,7 +54,7 @@ def is_url_valid(url: str) -> bool:
     if not parsed.hostname or parsed.hostname.lower() in ["localhost"]:
         return False
 
-    if parsed.hostname in BLOCKED_SERVERS:
+    if is_hostname_blocked(parsed.hostname):
         logger.warning(f"{parsed.hostname} is blocked")
         return False
 
@@ -81,3 +81,11 @@ def check_url(url: str) -> None:
         raise InvalidURLError(f'"{url}" is invalid')
 
     return None
+
+
+@functools.lru_cache(maxsize=256)
+def is_hostname_blocked(hostname: str) -> bool:
+    for blocked_hostname in BLOCKED_SERVERS:
+        if hostname == blocked_hostname or hostname.endswith(f".{blocked_hostname}"):
+            return True
+    return False