:firebase:auth

Purpose: Firebase Authentication for email/password and Google credentials, with Credential Manager for saved credentials and Google account selection.

Key APIs

Private builder excerpt; other options and the returned request are omitted.

// firebase/auth/src/main/kotlin/dev/atick/firebase/auth/data/AuthDataSourceImpl.kt
private fun getSignInRequest(): GetCredentialRequest {
    val getGoogleIdOption = GetGoogleIdOption.Builder().setFilterByAuthorizedAccounts(true)
        .setServerClientId(Config.WEB_CLIENT_ID).setAutoSelectEnabled(false).build()
    // ...
}

Gotchas

• The sign-in request offers saved passwords and previously authorized Google accounts. The registration request removes the Google-account filter. Both Google paths use Firebase signInWithCredential, which can create a Firebase user on first success; filtering is not a Firebase account-existence check. Sign-in does not automatically retry with the filter disabled.

• Configure Firebase, signing fingerprints and GOOGLE_WEB_CLIENT_ID as described in the setup guide before using Google credentials. The private request builders above are implementation details; consumers use AuthDataSource.

Related Documentation

• Firebase Setup § Credential Manager — account filtering and Firebase first-sign-in behavior

• Data Layer — where AuthRepositoryImpl/ProfileRepositoryImpl call this module