refactor: centralize settings and application services

assistant_bot/auth.py

@@ -4,7 +4,12 @@ from telegram import Update
 from telegram.constants import ChatType
 from telegram.ext import ApplicationHandlerStop, ContextTypes
 
-from .telegram_utils import get_storage, reply_markdown, require_user_id
+from .telegram_utils import (
+    get_services,
+    get_storage,
+    reply_markdown,
+    require_user_id,
+)
 
 
 def passwords_match(candidate: str, expected: str) -> bool:
@@ -37,7 +42,7 @@ async def authentication_guard(
         raise ApplicationHandlerStop
 
     candidate = message.text.strip() if message and message.text else ""
-    password = str(context.application.bot_data["assistant_password"])
+    password = get_services(context).assistant_password
     if candidate and passwords_match(candidate, password):
         storage.authorize_user(user_id)
         await reply_markdown(