How can use Firebase Plugins in IOS Share Extensions with Flutter view?

[thaidmfinnick]

I am using IOS Share Extensions follow this guideline: https://docs.flutter.dev/platform-integration/ios/app-extensions

About UI it works great, but I wonder how can share Firebase plugins configuration between extension and main app. For example, I am logged in using FirebaseAuth in main app, if I open Share Extension, I will be logged in too. I have not found a official documentation about this (between main app and extension).

Does anyone meet these cases? And can we achieve that?

Thank you!

[syedsadiquh]

You can use a "Shared Keychain". Firebase provides official support for sharing the authentication state with other apps on Apple devices using a shared keychain. Here:- firebase shared keychian
Additionally, you can enable App grouping by adding a new app group identifier. Add both your application and extension to that app group.

Lastly, you have to configure the extension to use Firebase using the copy of GoogleService-Info.plist file. Just make sure that you have the shared keychain enabled in both and use the same keychain group. It should work fine.

[thaidmfinnick]

Do you have example or repo has using your above recommend? I have read this firebase keychain and apply all of this but it's not working. Seems Firebase plugins and iOS extension not working

[syedsadiquh]

I have it on my private repo. And have some confidential keys directly (as I planned it not to share). However, I can highlight some key issues you might be having, which I had when building.

1. Carefully check the keychain sharing (check the entitlements file in both the main app and iOS extension.
2. I was stuck here. The GoogleService-Info.plist must be added to both targets. Check that the bundle identifiers match the Firebase configuration.
   If you have additional rules for let's say, Firestore, make sure to go through them as well.

I think you must have implemented it correctly, but I would like to confirm that you defined the "currentUser auth state" and "getting shared content" in native iOS code (e.g. ShareViewController.swift file). Then, you can invoke those methods while initialising the share extension at its startup in initState().
You can use the Xcode console as well as add print statements in native code to keep track of what calls it and what it returns.

If you still have issues, feel free to ask.

[thaidmfinnick]

Thank you so much for detail instruction. Some instructions are different with my code. I will try again and response to you.