Re: [GNAP] [Txauth] Revisiting the photo sharing example (a driving use case for the creation of OAuth)

[Justin Richer <[e-mail]>]

I think the roles are linked, but so are the roles of the AS and RS (since the RS needs to trust and understand what the AS issues, ultimately). But by talking about them as separate roles, we can talk about ways to connect them, much the way that separating the AS from the RS (which were both just the “server” in OAuth 1) let us talk about JWTs and token introspection as methods for connecting the two.

And the thing is, people are already deploying the token-issuing portions and the interactive portions separately. For example these all point towards that:

https://github.com/ietf-wg-gnap/general/wiki/Decomposed-Grant-Server <https://github.com/ietf-wg-gnap/general/wiki/Decomposed-Grant-Server>

https://github.com/ietf-wg-gnap/general/wiki/Three-Client-server-use-cases-built-along-%22Privacy-by-Design%22.-Contribution-from-Denis <https://github.com/ietf-wg-gnap/general/wiki/Three-Client-server-use-cases-built-along-%22Privacy-by-Design%22.-Contribution-from-Denis>

https://github.com/ietf-wg-gnap/general/wiki/Multiple-Authorization-Servers-in-a-single-flow <https://github.com/ietf-wg-gnap/general/wiki/Multiple-Authorization-Servers-in-a-single-flow>


Additionally, this is similar to how Google deploys OAuth 2 today, with the user interactive portion and the token-issuing portion in separate trust domains. We can label these parts separately without defining a single method of connecting them, and importantly without assuming they’ll be in the same box for someone’s deployment. 

 — Justin

> On Aug 14, 2020, at 2:29 AM, Fabien Imbault <[e-mail]> wrote:
> 
> Thanks, that's an important use case. Should add DID also. 
> 
> This raises additional questions related to claim aggregation though, in case you have contradictory information.
> 
> Le ven. 14 août 2020 à 03:39, Dave Tonge <[e-mail] <mailto:[e-mail]>> a écrit :
> > I agree with clearly separating the GS interaction with the Client from the interaction with the User. 
> 
> > I'm having a hard time viewing those as two different roles. They are two different interactions. Just as the client interaction with the AS is different from the client interaction with the GS.
> 
> I also struggle to see these as different roles - they seem to be fundamentally linked, 
> However what I think does need to be taken into consideration is that there may be multiple Grant Servers involved in a user flow (I've added a new use case to describe some of these flows: https://github.com/ietf-wg-gnap/general/wiki/Multiple-Authorization-Servers-in-a-single-flow <https://github.com/ietf-wg-gnap/general/wiki/Multiple-Authorization-Servers-in-a-single-flow>)
> 
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