Dropbox callback does not work via CLI

[JoepdeJong]

Describe the bug
It seems not possible to retrieve an OAuth2 token on a Linux machine that has only CLI installed. The redirect uri is of course not able to open the program, but the prompt also does not allow to manually type a code.

To Reproduce
Steps to reproduce the behavior:

1. run duck --list dropbox:/ in terminal, this outputs something like:

https://www.dropbox.com/1/oauth2/authorize?client_id=XXXX&code_challenge=XXXX&code_challenge_method=S256&redirect_uri=x-cyberduck-action:oauth&response_type=code&state=XXXX
Open web browser to authenticate and obtain an authorization code

3. go on my main machine to the url
4. Accept the terms and copy the redirect-uri: x-cyberduck-action:oauth?code=XXXXX&state=XXXXX
5. There is no way to paste the code in the terminal shell directly, and the x-cyberduck-action:oauth also does not work when only a CLI is installed.

Expected behavior
After Open web browser to authenticate and obtain an authorization code an input prompt should start which allows typing the code manually

Desktop (please complete the following information):

• OS: ubuntu
• • Version 22.04

[AliveDevil]

@dkocher Add OAuth prompt handle so that pasting the x-cyberduck-action automatically retrieves all required information?

Joep, copying the redirect URI and only using the X part after code= should work, though isn't elegant and requires opening up some text editing application.

[dkocher]

Duplicate for #13587.