颤动放大认知，无令牌使用fetchAuthSession

Question

我正在尝试使用Cognito在我的Flutter应用程序中实现身份验证。我正在对一个现有的userPool进行身份验证，我在过去一年中在我的React应用程序中成功地使用了它。

但是，使用Flutter时，我无法获取用户的会话。我可以成功登录，但无法使用fetchAuthSession()方法获取任何令牌。你知道为什么会发生这种事吗？下面是我的一些工作代码和非工作代码：

此代码成功...

Future _usersEmail() async {
    try {
      var attributes = (await Amplify.Auth.fetchUserAttributes()).toList();
      for (var attribute in attributes) {
        if (attribute.userAttributeKey == 'email') {
          print("user's email is ${attribute.value}");
          return '${attribute.value}';
        }
      }
      return 'no email';
    } on AuthException catch (e) {
      return '${e.message}';
    }
  }

这段代码也是成功的。

  Future<bool> _isSignedIn() async {
    final CognitoAuthSession session =
        await Amplify.Auth.fetchAuthSession() as CognitoAuthSession;
    print('_isSignedIn: ${session.isSignedIn}');
    return session.isSignedIn;
  }

此代码返回null...

  Future _getIdToken() async {
    final CognitoAuthSession session =
        await Amplify.Auth.fetchAuthSession() as CognitoAuthSession;
    final idToken = session.userPoolTokens?.idToken;
    print('idToken: $idToken');
    return idToken;
  }

这是我的amplifyconfig...

{
  "UserAgent": "aws-amplify-cli/2.0",
  "Version": "1.0",
  "auth": {
      "plugins": {
          "awsCognitoAuthPlugin": {
              "UserAgent": "aws-amplify-cli/0.1.0",
              "Version": "0.1.0",
              "IdentityManager": {
                  "Default": {}
              },
              "CredentialsProvider": {
                  "CognitoIdentity": {
                      "Default": {
                          "PoolId": "us-east-1_abcxyz",
                          "Region": "us-east-1"
                      }
                  }
              },
              "CognitoUserPool": {
                  "Default": {
                      "PoolId": "us-east-1_abcxyz",
                      "AppClientId": "5j0kii90dJ09est43xh3X21",
                      "Region": "us-east-1"
                  }
              },
              "Auth": {
                  "Default": {
                      "authenticationFlowType": "USER_SRP_AUTH"
                  }
              }
          }
      }
  }
}

Answer 1

您可能需要在options参数中将getAWSCredentials设置为true，如下所示：

   final authSession = (await Amplify.Auth.fetchAuthSession(
      options: CognitoSessionOptions(getAWSCredentials: true),
    )) as CognitoAuthSession;