[SDK-2542] Expose methods from Auth0 SPA SDK

[stevehobbsdev]

This PR exposes the following methods from Auth0 SPA SDK so that the SDK can be used
in the context of an Ionic + Capacitor app, where calling this manually is
necessary in order to be able to handle the callback at the right time:

• handleRedirectCallback
• buildAuthorizeUrl
• buildLogoutUrl

Added unit tests for each.

[frederikprijck]

Looks good, but added one comment.

[ljmcadenas]

Hi there.
It'd be amazing to have these methods exposed. Is there any estimated date to release this once merged?

Thanks!

[frederikprijck]

@ljmcadenas That shouldn't take too long, hopefully end of this week or early next week.

Out of curiosity, may I ask what is your use case for looking forward to these changes?

[ljmcadenas]

@frederikprijck , sure.
So, we are logging in the user in a web app. At some point in the time, we need to launch a desktop app from the web. We don't want the user to go through the login flow again if it's already authenticated on the web. So, we are trying to get a new authorization code by calling the authorize endpoint from the browser (In an iframe and taking advantage it has all auth0 cookies set up) and passing it to the desktop app so it can ask for a new token to be used there.

However, I found out this method buildAuthorizeUrl does more things I'm not interested in. Like creating a new transaction in the transaction manager. So I might end up building the URL manually.

Any better idea you might have would be much appreciated :)

[nonsenseless]

@frederikprijck @stevehobbsdev Sorry to bother you but what exactly is the workflow for using these methods supposed to look like? It's not entirely obvious from the documentation.

[frederikprijck]

@nonsenseless If you are talking about in the context of Ionic, we are working on some guidance that should be available soon. If you are talking about in the context of Angular, outside of Ionic, you shouldn't realy need these methods.

[nonsenseless]

@frederikprijck I meant specifically in the context of ionic 5 and capacitor; from the GitHub history it looks like this is something y'all are aware of and talking over but I'd definitely appreciate getting a better sense of how y'all anticipate these being used.

[nonsenseless]

@frederikprijck Actually, I may have finally slotted all the pieces together. I'll try to prepare a write-up of what was useful in my case.