refac: use dependencies to verify token

- feat: added new util to get the current user when needed. Middleware was adding authentication logic to all the routes. let's revisit if we can move the non-auth endpoints to a separate route.
- refac: update the routes to use new helpers for verification and retrieving user
- chore: added black for local formatting of py code

backend/apps/ollama/main.py

@@ -8,7 +8,7 @@ import json
 
 from apps.web.models.users import Users
 from constants import ERROR_MESSAGES
-from utils.utils import extract_token_from_auth_header
+from utils.utils import decode_token
 from config import OLLAMA_API_BASE_URL, WEBUI_AUTH
 
 app = Flask(__name__)
@@ -34,8 +34,12 @@ def proxy(path):
     # Basic RBAC support
     if WEBUI_AUTH:
         if "Authorization" in headers:
-            token = extract_token_from_auth_header(headers["Authorization"])
-            user = Users.get_user_by_token(token)
+            _, credentials = headers["Authorization"].split()
+            token_data = decode_token(credentials)
+            if token_data is None or "email" not in token_data:
+                return jsonify({"detail": ERROR_MESSAGES.UNAUTHORIZED}), 401
+
+            user = Users.get_user_by_email(token_data["email"])
             if user:
                 # Only user and admin roles can access
                 if user.role in ["user", "admin"]: