Authenticate Firestore without Firebase JSON File? - firebase

Question

I am building an application that connects to a Database from Firestore, and when looking into the documentation the way they recommend for authentication into firestor is using the Firebase JSON file, for example this my adapter's constructor code:
public UserDataAdapter()
{
Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS","//file_path");
_firestoreDb = FirestoreDb.Create("databaseName") ?? throw new ArgumentNullException(nameof(FirestoreDb));
}
This is the source I am using: https://cloud.google.com/dotnet/docs/reference/Google.Cloud.Firestore/latest.
So is there a way that I could authenticate Firestore without using the JSON file?
In the past I used the library for Firebase Authentication called FirebaseAuthentication.net and it uses something like this:
var auth = new FirebaseAuthProvider(new FirebaseConfig(_firebaseSettings.ApiKey));
In where the ApiKey is the firebase secret, I am trying to do something like that

Answer 1

You can do something like this.
var GoogleSecretJson = builder.Configuration["GoogleSecretJson"];
var credential = GoogleCredential.FromJson(GoogleSecretJson).CreateScoped();
var firestoreClientBuilder = new FirestoreClientBuilder
{
ChannelCredentials = credential.ToChannelCredentials()
};
var client = firestoreClientBuilder.Build();
var db = FirestoreDb.Create("firestore-db", client: client);
You can set the GoogleSecretJson value from JSON file content.