Firebase Auth仅返回INVALID_LOGIN_CREDENTIALS错误，禁用邮箱枚举保护失败

在Flutter/Dart代码中调用FirebaseAuth.instance.signInWithEmailAndPassword()实现邮箱密码登录，为区分用户输入错误密码、不存在邮箱等场景，我原本计划捕获user-not-found、invalid-email、user-disabled、wrong-password这些具体错误码，但实际测试时所有错误场景都仅返回INVALID_LOGIN_CREDENTIALS这一个统一错误码。

登录实现代码 #

Future<AuthResult> signIn(String email, String password) async {
  try {
    await FirebaseAuth.instance.signInWithEmailAndPassword(
      email: email,
      password: password,
    );
    
    return AuthResult.success;
  } on FirebaseAuthException catch (e) {
    print(e.code);

    switch (e.code) {
      case 'user-not-found':
        return AuthResult.userNotFound;
      case 'invalid-email':
        return AuthResult.invalidEmail;
      case 'user-disabled':
        return AuthResult.userDisabled;
      case 'wrong-password':
        return AuthResult.wrongPassword;
      default:
        return AuthResult.failure;
    }
  } catch (_) {
    return AuthResult.aborted;
  }
}

尝试禁用邮箱枚举保护时的报错 #

查Stack Overflow和GitHub后得知，该问题与Firebase的邮箱枚举保护机制有关。我按照Google Cloud文档步骤尝试禁用该功能，但执行命令时在Google Cloud控制台出现以下错误：

curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: Bearer
curl: (3) URL using bad/illegal format or missing URL
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: application
curl: (3) URL using bad/illegal format or missing URL
curl: (3) URL using bad/illegal format or missing URL
{
  "error": {
    "code": 401,
    "message": "Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.",
    "status": "UNAUTHENTICATED",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "CREDENTIALS_MISSING",
        "domain": "googleapis.com",
        "metadata": {
          "service": "identitytoolkit.googleapis.com",
          "method": "google.cloud.identitytoolkit.admin.v2.ProjectConfigService.UpdateConfig"
        }
      }
    ]
  }
}

内容的提问来源于stack exchange，提问作者Mohammed Jamal