Get confusing error "could not find token module file" when executing token module file throwing FileNotFoundError

[qihongchen]

Description

I setup authentication in engine_settings.json

  "authentication": {
    "token": {
      "module": {
        "file": "C:\\Repos\\lhsecurity-playground\\restler\\TJSSession\\tjs_acquire_tokens.py",
        "function": "acquire_token",
        "data": {
          "client_id": "client_dummy_id"
        }
      },
      "token_refresh_interval": 600
    }

but "Restler.exe test ..." command give following error in network log

2023-10-19 04:27:35.388: Could not find token module file at C:\Repos\lhsecurity-playground\restler\TJSSession\tjs_acquire_tokens.py. Please ensure that you've passed a valid path
2023-10-19 04:27:35.396: Error: Invalid token authentication mechanism. 
Failed with Could not find token module file at C:\Repos\lhsecurity-playground\restler\TJSSession\tjs_acquire_tokens.py. Please ensure that you've passed a valid path

the token module file tjs_acquire_tokens.py exists, what happen is tjs_acquire_tokens.py read a local file in the same directory, that local file was specified with relative path like "my_token.txt", and I was able to run the token module file directly w/o problem. But when "Restler.exe test ..." executing token module file, it can't find file "my_token.txt" since it most likely changes the current working path.

Since the code of loading token module file and execute token module file are in the same try/catch block, it can't differentiate FileNoteFoundError from loading or executing token module file (here's the link to that code https://github.com/microsoft/restler-fuzzer/blob/99bc15988cd4c1e53bda1133728801d7d92061ff/restler/engine/core/request_utilities.py#L144C1-L150C32), and it always assume it can't find token module file in this case, and the error message is confusing.

Steps to reproduce

in token module file, read a local file with relative path when generate token, something like following

        with open("s2stoken.txt") as tokenFile:
            s2sToken = "Bearer " + tokenFile.readline().strip()

Expected results

Get error shows FileNotFoundError when execute token module file

Actual results

token module file not found

Environment details

Windows 11, Python 3.8.2, dotnet 7.0.402, restler 9.2.2