Error when using dash-auth and pattern-matching callbacks simultaneously

[Pierlou]

Hi,

Thanks for this lib! I am building a rather simple app and I have bumped into an error with these steps:

1. use dash auth to put the app behind a login requirement

auth = dash_auth.BasicAuth(
    app,
    VALID_USERNAME_PASSWORD_PAIRS
)

2. create a callback that uses an undefined number of inputs using the pattern-matching mechanism:

@app.callback(
    Output("tmp_output", "children"),
    [Input({'type': 'certify', 'index': dash.ALL}, 'n_clicks')],
    prevent_initial_call=True,
)
def print_output(*args):
    print(args)
    return str(args)

where all inputs are clicks from an unknown number of buttons which ids are {'type': 'certify', 'index': f'certif:button_{s}'} (with s being a parameter from a list built within another callback).

If I uncomment the auth part or this specific callback, everything works like a charm, otherwise I am getting:

  File "...\lib\site-packages\dash_auth\auth.py", line 72, in <genexpr>
    if inp["property"] == "pathname"
  TypeError: list indices must be integers or slices, not str

When going to the specific part of the code it appears (if I understand it correctly), that it is not expecting that the input can be multiple, is that right? In my case, if I print [inp for inp in body["inputs"]] right before the error is raised, I get a list of a list inputs, which could mean that the code could go one step deeper in case the inputs are multiple.

I hope this context helps (and that I am not missing an issue from my code).

Versions:

dash==2.11.1
dash_auth==2.2.0

FYI @mikoa9

[RenaudLN]

#146 should address this @alexcjohnson

[Pierlou]

I made almost the same fix directly in the auth.py locally and can confirm it works well. Thanks!

[Pierlou]

Hi, any idea when this will be reviewed/merged/deployed? Can I be of any help to make it happen? 🙏

[RenaudLN]

It has been merged, a new version needs to be released.

[alexcjohnson]

Thanks - I thought I'd wait for #145 but it was easy enough to make a new release for this fix:
https://github.com/plotly/dash-auth/releases/tag/v2.2.1
https://pypi.org/project/dash-auth/2.2.1/