refactor: make /events endpoint lightweight without requiring active conversation (#9685)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/server/utils.py

@@ -3,9 +3,14 @@ import uuid
 from fastapi import Depends, HTTPException, Request, status
 
 from openhands.core.logger import openhands_logger as logger
-from openhands.server.shared import ConversationStoreImpl, config, conversation_manager
+from openhands.server.shared import (
+    ConversationStoreImpl,
+    config,
+    conversation_manager,
+)
 from openhands.server.user_auth import get_user_id
 from openhands.storage.conversation.conversation_store import ConversationStore
+from openhands.storage.data_models.conversation_metadata import ConversationMetadata
 
 
 async def get_conversation_store(request: Request) -> ConversationStore | None:
@@ -29,6 +34,21 @@ async def generate_unique_conversation_id(
     return conversation_id
 
 
+async def get_conversation_metadata(
+    conversation_id: str,
+    conversation_store: ConversationStore = Depends(get_conversation_store),
+) -> ConversationMetadata:
+    """Get conversation metadata and validate user access without requiring an active conversation."""
+    try:
+        metadata = await conversation_store.get_metadata(conversation_id)
+        return metadata
+    except FileNotFoundError:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=f'Conversation {conversation_id} not found',
+        )
+
+
 async def get_conversation(
     conversation_id: str, user_id: str | None = Depends(get_user_id)
 ):