Firebase Auth: We need to upgrade package with new changes made in Facebook Login for iOS about flutterfire HOT 13 OPEN

same issue in my unity game.
Unity: 2021.3.37f1
Firebase SDK: 10.2.0
Facebook SDK: 17.0.0

Error Message:
SignInWithCredentialAsync encountered an error: System.AggregateException: One or more errors occurred. (One or more errors occurred. (Bad access token: {"code":190,"message":"Malformed access token"}))

Firebase.FirebaseException: Bad access token: {"code":190,"message":"Invalid OAuth access token - Cannot parse access token"}

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I will attempt to reproduce this issue. In the meantime, you might find it helpful to look at a similar issue reported with the Facebook SDK here: facebook-ios-sdk issue #2365. This may provide some insights into the problem you are encountering. Additionally, I suspect that FlutterFire may not be responsible for this error, but I will confirm this as I investigate further.

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Hi @RaghvindYadav,

The issue is due to the Facebook SDK/plugin. As mentioned here we need to get the nonce. We'll need a plugin that supports limited login to utilize this updated code snippet:

final provider = OAuthCredential(
  providerId: 'facebook.com',
  signInMethod: 'oauth',
  idToken: accessToken.token,
  rawNonce: rawNonce,
);

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@owllyi Have you find any solution?

#if UNITY_ANDROID
credential = Firebase.Auth.FacebookAuthProvider.GetCredential(accessToken);
#elif UNITY_IOS
var authToken = FaceBookManager.Instance.GetToken();
var nonce = FaceBookManager.Instance.GetNonce();
credential = Firebase.Auth.OAuthProvider.GetCredential("facebook.com", authToken, nonce, null);
#endif

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I've looked into the new package, can you try using this instead and let me know if it works:

      final AccessToken accessToken = result.accessToken!;

      final AuthCredential credential;

      switch (accessToken.type) {
        case AccessTokenType.classic:
          final token = accessToken as ClassicToken;
          credential = FacebookAuthProvider.credential(token.authenticationToken!,);
          break;
        case AccessTokenType.limited:
          final token = accessToken as LimitedToken;
          credential = OAuthCredential(
            providerId: 'facebook.com',
            signInMethod: 'oauth',
            idToken: token.tokenString,
            rawNonce: token.nonce,
          );
          break;
      }

      // Login with token
      await auth.signInWithCredential(credential);

We might need to add a new option in the future for limited login so it can be just FacebookAuthProvider.limitedCredential(....)

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I can reproduce this error, I guess the signInMethod should be oauth for it to work, since signInMethod: 'facebook.com' will not use nonce, or the idToken.

/cc @Lyokone

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@owllyi Have you find any solution?

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Hello @RaghvindYadav,

Thank you for reporting this issue. Based on the link you shared, it appears that the problem may not be related to FlutterFire but rather to the Facebook SDK plugin you are using. Did I understand that correctly? If so, you might consider opening an issue in their respective repository to get further assistance.

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Hi @TarekkMA
May be you are right but I am getting failed error at this line of code return FirebaseAuth.instance.signInWithCredential(facebookAuthCredential);
And FirbaseAuth comes form firebase_auth package.

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@TarekkMA I did the above you mentioned, still getting the same error.
Also use a new package https://pub.dev/packages/flutter_facebook_auth/versions/7.0.0-dev.3/changelog#700-dev3

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@TarekkMA I did the above you mentioned, still getting the same error. Also use a new package https://pub.dev/packages/flutter_facebook_auth/versions/7.0.0-dev.3/changelog#700-dev3

Thank you @TarekkMA, I used that package but still persisting with same problem. Now accessToken looks quite different than previous response.

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@TarekkMA AccessTokenType.limited getting this error for now Firebase Auth error: [firebase_auth/missing-or-invalid-nonce] The nonce in ID Token "C7D21692-B861-4E45-A912-DB9F4502AA2B" does not match the SHA256 hash of the raw nonce "C7D21692-B861-4E45-A912-DB9F4502AA2B" in the request.

If I changed this parameter signInMethod: 'oauth' to signInMethod: 'facebook.com', then app get crashed.

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@owllyi does your implementation work?

var authToken = FaceBookManager.Instance.GetToken();
var nonce = FaceBookManager.Instance.GetNonce();
credential = Firebase.Auth.OAuthProvider.GetCredential("facebook.com", authToken, nonce, null);

Would be interesting how your facebook-login implementation looks like. I got this error:
The nonce in ID Token "xxx" does not match the SHA256 hash of the raw nonce "xxx" in the request

Do you use the hashed nonce or raw nonce in
FB.Mobile.LoginWithTrackingPreference method?

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