[📚] Facebook Login Documentation - Authentication

[Rahul-Vijay]

The current documentation -
Authentication --> Social Auth under the Facebook section has the following code:

Future<UserCredential> signInWithFacebook() async {
  // Trigger the sign-in flow
  final LoginResult result = await FacebookAuth.instance.login();

  // Create a credential from the access token
  final FacebookAuthCredential facebookAuthCredential =
    FacebookAuthProvider.credential(result.accessToken.token);

  // Once signed in, return the UserCredential
  return await FirebaseAuth.instance.signInWithCredential(facebookAuthCredential);
}

The following lines should be replaced:

// replace this
final LoginResult result = await FacebookAuth.instance.login();

// with this
final AccessToken result = await FacebookAuth.instance.login();

And

// replace this
final FacebookAuthCredential facebookAuthCredential =
    FacebookAuthProvider.credential(result.accessToken.token);

// with this
final FacebookAuthCredential facebookAuthCredential =
    FacebookAuthProvider.credential(result.token);

For reference facebook_auth.dart -

Future<AccessToken> login({
    ...
  }

I couldn't understand why it didn't import LoginResult, after going through the code, turns out there is no defined LoginResult class and the async method FacebookAuth.instance.login() returns an AccessToken object. Hope this helps.
Thanks!

[Krunal3909]

Can I work on this issue?

[rrousselGit]

Closing as this was fixed

[anburocky3]

New codes are not working, old codes are working anyhow.

New Codes:

Future<UserCredential> signInWithFacebook() async {
  try {
        // Trigger the sign-in flow
        final AccessToken result = await FacebookAuth.instance.login();
    
        // Create a credential from the access token
        final FacebookAuthCredential facebookAuthCredential = FacebookAuthProvider.credential(result.token);
    
        // Once signed in, return the UserCredential
        return await FirebaseAuth.instance.signInWithCredential(facebookAuthCredential);

    } on FirebaseAuthException catch (e) {
       handleErrors(e);
}

This works:

Future<UserCredential> signInWithFacebook() async {
  try {
      final LoginResult result = await FacebookAuth.instance.login();

      // Create a credential from the access token
      final FacebookAuthCredential facebookAuthCredential = FacebookAuthProvider.credential(result.accessToken.token);

      // Once signed in, return the UserCredential
      return await FirebaseAuth.instance.signInWithCredential(facebookAuthCredential);

    } on FirebaseAuthException catch (e) {
       handleErrors(e);
}