feat: google # persistence and auth state

[Aidasvenc]

What I did

Re-implemented Google # so that no native modules are required on runtime. The Google # functionality only works in builds, but the whole app is now once again fully testable with Expo Go. Bonus: Google # also works on iOS.

Furthermore, an authentication state persistence was implemented so that users remain signed-in even when the app is closed and re-opened.

Finally, the Login and Logout flow is now fully implemented with the authentication stack (now renamed to MainStack) returning either the Authentication flow or HomeTabs based on the user's auth state.

All of these functionalities are demonstrated in the demo.

How I did it

• Used only the firebase SDK to implement google #.
• Used expo-auth-session and expo-crypto as well as expo-web-browser to handle authentication tokens and redirection to/from a google login web page.
• Used exposed auth methods and AsyncStorage to keep track of the authentication state and persist it.

How to verify it

• Test the simple login/logout flow use npx expo start --go
• Test Google Sign-in with a newest build from eas or run it locally with npx expo prebuild and then npm run android

Demo video

WhatsApp.Video.2024-04-23.at.12.27.13_b9a93d9d.mp4

Pre-merge checklist

The changes I have introduced:

• work correctly
• do not break other functionalities
• work correctly on Android
• are fully tested

[GaelCondeLosada]

It works on my device !

WhatsApp.Video.2024-04-23.at.12.27.13_b9a93d9d.mp4

[Fyuryy]

Good job Aidas, LGTM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
85.4% Coverage on New Code
0.7% Duplication on New Code

See analysis details on SonarCloud