Create super user account if it does not exist (#1688)

* fix: temp create account for `super_user_id` if missing

* chore: remove dumb import

* refactor: move logic outside `crud`

* feat: add uuid4 conversion

* fix: require valid string in .env file

* fix: update the `settings.super_user` value in case or normalisation for UUID4

* fix: allow long super_user

* chore: code format

* fix: add UI redirect with the normalized user

* fix: normalize `super_user` up one level

* fix: should normalize user in non-ui mode also

lnbits/core/helpers.py

@@ -1,6 +1,7 @@
 import importlib
 import re
 from typing import Any
+from uuid import UUID
 
 import httpx
 from loguru import logger
@@ -63,3 +64,14 @@ async def stop_extension_background_work(ext_id: str, user: str):
                 url = f"https://{settings.host}:{settings.port}/{ext_id}/api/v1?usr={user}"
             except Exception as ex:
                 logger.warning(ex)
+
+
+def to_valid_user_id(user_id: str) -> UUID:
+    if len(user_id) < 32:
+        raise ValueError("User ID must have at least 128 bits")
+    try:
+        int(user_id, 16)
+    except:
+        raise ValueError("Invalid hex string for User ID.")
+
+    return UUID(hex=user_id[:32], version=4)