Passing current session/token of FirebaseAuth from Native Android App to a WebView's Firebase App

user_3822374 0
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Scenario

  • It is a hybrid app (Most of Android Native Java and part html/javascript in a WebView)
  • FirebaseAuth for authentication/signIn [in Android Native app]
  • Firestore as database
  • Serverless app

I want to
pass the Authentication from Android Native app which was done via FirebaseAuth
TO
html/javascript screens which are being embedded as Webview in my app, so that i can call my Firebase DB without asking user to relogin.

What I Tried
i tried to signIn using signInWithCustomToken and used the token generated from getidtokenresult which throws error "INVALID_CUSTOM_TOKEN"

Any guidance will be helpful

firebase-security google-cloud-firestore firebase-authentication firebase android-webview
1 Answers

You can use the Firebase Admin SDK in your Native app to generate a valid token for your client app to use with signInWithCustomToken()

Token Generation:

//The uid should uniquely identify the user or device you are authenticating
String uid = "some-uid";

String customToken = FirebaseAuth.getInstance().createCustomToken(uid);
// Send token back to client

Use in client app:

firebase.auth().signInWithCustomToken(token).catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  // ...
});

There is further information about this in the Firebase docs

user_121632740
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