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Investigate OS errors returned for encryption scenarios on Windows and MacOS #64

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@abhidnya13

Description

@abhidnya13

Cache file previously used with MSAL already exists before using MSAL Extensions for the very first time.

For macOS:

Keychain Error: ITEM_NOT_FOUND was returned as service name and account name entry is not found

For windows:

If the file has no data: WinError 87: The parameter is incorrect - is returned.
If the file has cache stored in previous MSAL cache format(not encrypted) - returns WinError 13- The data is invalid


There is another WinError that is currently raised at this point : OSError: [WinError -2146893813] : '' for which the cause is unknown. Have not been able to reproduce it yet. Adding the stack trace here:

Traceback (most recent call last):
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\kinshu\AppData\Local\Programs\Python\Python37\Scripts\bonsai.exe\__main__.py", line 7, in <module>
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\bonsai_cli\bonsai.py", line 3457, in main
    cli()
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\click-7.0-py3.7.egg\click\core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\click-7.0-py3.7.egg\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\click-7.0-py3.7.egg\click\core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\click-7.0-py3.7.egg\click\core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\click-7.0-py3.7.egg\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\click-7.0-py3.7.egg\click\decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\bonsai_cli\bonsai.py", line 3254, in configure
    bonsai_config = Config(use_aad=True, require_workspace=False)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\bonsai_cli\config.py", line 215, in __init__
    self.accesskey = self.aad_client.get_access_token()
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\bonsai_cli\aad.py", line 109, in get_access_token
    token = self._get_access_token_from_cache()
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\bonsai_cli\aad.py", line 96, in _get_access_token_from_cache
    accounts = self._app.get_accounts()
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\msal-1.0.0-py3.7.egg\msal\application.py", line 308, in get_accounts
    accounts = self._find_msal_accounts(environment=self.authority.instance)
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\msal-1.0.0-py3.7.egg\msal\application.py", line 328, in _find_msal_accounts
    TokenCache.CredentialType.ACCOUNT, query={"environment": environment})
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\msal_extensions\token_cache.py", line 55, in find
    self._reload_if_necessary()
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\msal_extensions\token_cache.py", line 36, in _reload_if_necessary
    self.deserialize(self._persistence.load())
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\msal_extensions\persistence.py", line 124, in load
    return self._dp_agent.unprotect(handle.read())
  File "c:\users\kinshu\appdata\local\programs\python\python37\lib\site-packages\msal_extensions\windows.py", line 111, in unprotect
    raise OSError(256, '', '', err_code)
OSError: [WinError -2146893813] : '' ```

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