Add hook for web view closing

[xavierLowmiller]

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

(Draft PR to discuss the general approach. If you're in favor of this change, I can add tests.)

📋 Changes

We're looking for a possibility to hook into the provider life cycle, in our case to show a loading animation after the web view is dismissed:

graph
  a[ASWebAuthenticationSession runs] --> b[AuthTransaction.resume runs];

Loading

This PR adds an optional closure to be executed when the web view finishes:

graph
  a[ASWebAuthenticationSession runs] --> b[onWebViewClose is called];
  b --> c[AuthTransaction.resume runs]

Loading

🎯 Testing

1. Create a web auth session using Auth0.webAuth(...)
2. Chain onWebViewClose on it
3. Start the session

The onWebViewClose is called when the provider finishes its work but before the auth transaction.

[Widcket]

Hi @xavierLowmiller, thanks for raising this and apologies for the delay.

I'll need to take a look at this in more detail, I expect to get back to this next week as I'm a bit busy at the moment. Thanks for your patience.

[xavierLowmiller]

Thank you!
Please take your time, don't want to make you even busier ✌️

[Widcket]

Let's call it onClose, and the parameter callback.

[xavierLowmiller]

Done in ce72102 👍

[Widcket]

Hi @xavierLowmiller, thanks for your patience and contribution.

I see the use case, and agree this would be a good addition. I've left a couple of comments about the naming. Please don't forget to add the respective unit tests.

[xavierLowmiller]

Hey @Widcket!

Thank you for the review, and sorry it took so long to address your feedback.

Please don't forget to add the respective unit tests.

Please check if my additions in a5596d8 are sufficient.

[Widcket]

LGTM, thanks @xavierLowmiller!