Adding settings for users lists, showing all auto groups in groups

allianceauth/authentication/app_settings.py

@@ -0,0 +1,46 @@
+from django.conf import settings
+
+
+def _clean_setting(
+    name: str,     
+    default_value: object,         
+    min_value: int = None,
+    max_value: int = None,
+    required_type: type = None
+):
+    """cleans the input for a custom setting
+    
+    Will use `default_value` if settings does not exit or has the wrong type
+    or is outside define boundaries (for int only)
+
+    Need to define `required_type` if `default_value` is `None`
+
+    Will assume `min_value` of 0 for int (can be overriden)
+
+    Returns cleaned value for setting
+    """                
+    if default_value is None and not required_type:
+        raise ValueError('You must specify a required_type for None defaults')
+    
+    if not required_type:
+        required_type = type(default_value)
+
+    if min_value is None and required_type == int:
+        min_value = 0        
+        
+    if (hasattr(settings, name)
+        and isinstance(getattr(settings, name), required_type)
+        and (min_value is None or getattr(settings, name) >= min_value)
+        and (max_value is None or getattr(settings, name) <= max_value)
+    ):        
+        return getattr(settings, name)    
+    else:
+        return default_value
+
+
+AUTHENTICATION_ADMIN_USERS_MAX_GROUPS = \
+    _clean_setting('AUTHENTICATION_ADMIN_USERS_MAX_GROUPS', 10)
+
+AUTHENTICATION_ADMIN_USERS_MAX_CHARS = \
+    _clean_setting('AUTHENTICATION_ADMIN_USERS_MAX_CHARS', 5)
+