[google_sign_in] Implement canAccessScopes on mobile

flutter/packages#3461 is adding a new API, which for now is only being implemented on web. We should add mobile implementations to avoid people hitting unimplemented errors if they try to use it on mobile. See flutter/packages#3461 (comment) for initial discussion.

https://github.com/flutter/packages/pull/3461/files#diff-ee105b5f152d7dbf49ec11ee1e0d3628b53dd7e2d6494df8e1def0596f99f103R449-R454

Checks if the [_currentUser] can access all the given [scopes].

Implemented in web as have all the scopes already been granted ("can access" is kind of vague imo).

oauth2.hasGrantedAllScopes(_lastTokenResponse!, scopes);

@ditman

@ditman Sounds like the docs should be adjusted here somewhat (since we've shipped the method name we'll need to keep that).

@stuartmorgan

@stuartmorgan should this be dependency: android or platform-android label? I don't think we actually need anything from the Android OS folks?

Thanks. I hate that label being first 😒

@ditman

@ditman Sounds like the docs should be adjusted here somewhat (since we've shipped the method name we'll need to keep that).

@stuartmorgan What adjustments do we want to make here? I can tweak the docs in any way without having to necessarily wait for the mobile implementations!

I think we probably just want to change it to say something like "has been granted access to all the given [scopes]", or "has been authorized to access all the given [scopes]"; something to make it clearer that what's being checked is whether the authorization is already done.

(I've created a quick PR to update the dartdoc in a couple of places: flutter/packages#4092)

Im confused with the implemnentation of this method for mobile. In the changelogs, it says this is only implemented on web and not needed for mobile. Indeed, if this is called for Mobile I get an Unimplemented exception. So how does one check if these scopes have been granted on mobile? The documentation on the method mentions no such restrictions regarding implementation for mobile.

Would it be possible to get a clarification on the above question? Thanks

The current solution is to call GET API to get list scopes from the access_token and check it again. Hope the Flutter team can finish
https://www.googleapis.com/oauth2/v3/tokeninfo?access_token=....

[google_sign_in] Redesign API for current identity SDKs (flutter#9267)

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[google_sign_in] Redesign API for current identity SDKs (flutter#9267)

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jmagman commented on Apr 5, 2023

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jmagman commented on Apr 7, 2023

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[google_sign_in] Implement `canAccessScopes` on mobile #124206