Feat: Better mechanism for attaching middleware (#6365)

openhands/server/types.py

@@ -2,6 +2,8 @@ from abc import ABC, abstractmethod
 from enum import Enum
 from typing import ClassVar, Protocol
 
+from fastapi import FastAPI
+
 
 class AppMode(Enum):
     OSS = 'oss'
@@ -36,6 +38,11 @@ class OpenhandsConfigInterface(ABC):
         """Configure attributes for frontend"""
         raise NotImplementedError
 
+    @abstractmethod
+    def attach_middleware(self, api: FastAPI) -> None:
+        """Attach required middleware for the current environment"""
+        raise NotImplementedError
+
 
 class MissingSettingsError(ValueError):
     """Raised when settings are missing or not found."""