flutter - Web Flutter 中 GoogleSignInAuthentication accessToken 的 accessToken 为 null

Question

我正在尝试使我的应用程序的 web 版本在 flutter 中可用。在移动版本中，无论是 android 还是 ios，使用 google 凭据登录都可以完美运行。在 web flutter 中，我正确获取了 idToken，但 accessToken 为空。
我按照此视频中的步骤操作:https://www.youtube.com/watch?v=0HLt1TYA600&list=LLe08PibNO0_PFjUVIu5WcxQ&index=3&t=1681s

Future<User> signInWithGoogle() async {
    final googleSignIn = GoogleSignIn();

    try {
      final GoogleSignInAccount googleSignInAccount =
          await googleSignIn.signIn();
      if (googleSignInAccount != null) {
        final GoogleSignInAuthentication googleSignInAuthentication =
            await googleSignInAccount.authentication;
        print(">>> accessToken");
        print(googleSignInAuthentication.accessToken);
        print(">>> idToken");
        print(googleSignInAuthentication.idToken);
        if (googleSignInAuthentication.accessToken != null &&
            googleSignInAuthentication.idToken != null) {
        final AuthCredential credential = GoogleAuthProvider.getCredential(
          idToken: googleSignInAuthentication.idToken,
          accessToken: googleSignInAuthentication.accessToken,
        );

        final AuthResult authResult =
            await FirebaseAuth.instance.signInWithCredential(credential);

        final FirebaseUser user = authResult.user;
        return _userFromFirebase(user);
        } else {
          throw PlatformException(
            code: 'ERROR_MISSING_GOOGLE_AUTH_TOKEN',
            message: 'Missing Google Auth Token',
          );
        }
      } else {
        throw PlatformException(
          code: 'ERROR_ABORTED_BY_USER',
          message: 'Sign in aborted by user',
        );
      }
    } catch (error) {
      return null;
    }
  }

Answer 1

我开了一个 issue昨晚在 GitHub 上得到了答案:

Hey, please update to firebase_auth: ^0.18.0+1 - there was a bug with the assertion that was fixed.Latest versions can be seen here: https://firebase.flutter.dev/docs/migration/#2-update-firebase-plugins

澄清一下，问题不在于 accessToken是空的，它不一定非空。错误是有断言检查是否 要么 idToken或 accessToken不为空，但它确实会检查 两者 不为空。
为完整起见， here是修复此错误的确切行更改。注意他们是如何从检查 accessToken != null && idToken != null 改变的至 accessToken != null || idToken != null .