signInWithApple method

Implementation

Future<UserCredential> signInWithApple({
  List<AppleIDAuthorizationScopes> scopes =
      const <AppleIDAuthorizationScopes>[
    AppleIDAuthorizationScopes.email,
    AppleIDAuthorizationScopes.fullName,
  ],
}) async {
  if (!Platform.isIOS && !Platform.isMacOS) {
    throw UnsupportedError(
      'Apple sign-in is only supported on iOS & Macos for this app.',
    );
  }

  final rawNonce = _generateNonce();
  final nonce = _sha256OfString(rawNonce);

  final appleCredential = await SignInWithApple.getAppleIDCredential(
    scopes: scopes,
    nonce: nonce,
  );

  if (appleCredential.identityToken == null) {
    throw FirebaseAuthException(
      code: 'missing-apple-id-token',
      message: 'Apple sign-in returned no identityToken.',
    );
  }

  final oauthCredential = _oauthProvider.credential(
    idToken: appleCredential.identityToken,
    accessToken: appleCredential.authorizationCode,
    rawNonce: rawNonce,
  );

  final userCred = await _auth.signInWithCredential(oauthCredential);
  await getFirebaseIdToken();
  return userCred;
}