Firebase authentication with google login

Hi I am building an app using firebase as database. I dont want people to be able to edit the database unless when they are using the app.
I also dont want someone who have my firebase database link to be able to use it in their own app.
But i want my app users to be able to edit the data in the database through the app i given to them and only through the app.
I know i should set the database rules to authenticated users but subsequently how do i authenticate the users of my app and allow them to use my app to edit the database?

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Take a look at this extension @Zhou_Sicong