Question

我已经设置了Xamarin平台应用程序，该应用程序可以通过有效的AWS Cognito用户池处理用户登录。但是，当我尝试访问其他AWS服务时，会收到“无效的登录令牌”。错误。

在AWS控制台中，我已经设置了带有App Client的用户池以及使用Cognito作为身份验证提供程序的身份池：

编辑身份池>展开身份验证提供程序选项卡>认知选项卡>将我的用户池ID和应用程序客户端ID添加到必填字段。

我处理登录的代码片段如下：

private AmazonCognitoIdentityProviderClient provider;
    public AmazonCognitoIdentityProviderClient Provider
    {
        get
        {
            if(provider == null)
            {
                provider = new AmazonCognitoIdentityProviderClient(cognitoAWSCredentials, Constants.REGION_ENDPOINT);
            }

            return provider;
        }
    }

    private CognitoUserPool userPool;
    public CognitoUserPool UserPool
    {
        get
        {
            if(userPool == null)
            {
                userPool = new CognitoUserPool(Constants.AWS_COGNITO_USER_POOL_ID, Constants.AWS_COGNITO_APP_CLIENT_ID, Provider);
            }

            return userPool;
        }
    }

    private CognitoAWSCredentials cognitoAWSCredentials;
    public CognitoAWSCredentials CognitoAWSCredentials
    {
        get
        {
            if (cognitoAWSCredentials == null)
            {
                cognitoAWSCredentials = new CognitoAWSCredentials(Constants.AWS_COGNITO_USER_IDENTITY_POOL_ID, Constants.REGION_ENDPOINT);
            }
            return cognitoAWSCredentials;
        }
    }

    private async void GetAWSCredentials()
    {
        string accesstoken = string.Empty;

        // Try to find user;
        CognitoUser user = new CognitoUser(usernameField.Text, Constants.AWS_COGNITO_APP_CLIENT_ID, UserPool, Provider);
        InitiateSrpAuthRequest authRequest = new InitiateSrpAuthRequest()
        {
            Password = passwordField.Text
        };

        try
        {
            AuthFlowResponse authResponse = await user.StartWithSrpAuthAsync(authRequest);
        }
        catch(Exception ex)
        {
            string message = ex.Message;

            if(message == "User does not exist.")
            {
                await DisplayAlert("Error", message, "Ok");
            }
            else if(message == "Incorrect username or password.")
            {
                await DisplayAlert("Error", "Incorrect password.", "Ok");
            }
            else
            {
                await DisplayAlert("Error", "Oops! Something went wrong. Please try again.", "Ok");
            }

            loginButton.IsEnabled = true;

            return;
        }

        CognitoAWSCredentials.AddLogin("www.amazon.com", user.SessionTokens.IdToken);
    }

每当我尝试使用上述代码使用其他任何AWS服务（在本例中为DynamoDB）时，我都会不断收到以下错误消息：

“向https://cognito-identity.ap-southeast-2.amazonaws.com/发送ERROR | NotAuthorizedException请求GetIdRequest。尝试1。-> Amazon.CognitoIdentity.Model.NotAuthorizedException：无效的登录令牌。”

如何使用适用于Xamarin的AWS Cognito对用户进行正确的身份验证？

任何帮助将不胜感激。谢谢。

如何修复“无效的登录令牌”。尝试在AWS和Cognito用户池中使用经过身份验证的用户时

0 个答案: