code: def get_item(item_id: str, username: str = Depends(get_username)):
      if item_id not in data:
          raise HTTPException(status_code=404, detail="Item not found")
      item = data[item_id]
      if item["owner"] != username:
          raise OwnerError(username)
      return item
  
imports: from fastapi import Depends, FastAPI, HTTPException
label_desc: Use image node_id 2 for calling a global function with example usage: get_item(item_id, username) and returns: item