用户流 - API 连接器无法解析响应

Question

我有一个 Azure B2C 用户流。它与指向 Azure 函数的 API 连接器相关联。函数 returns 具有扩展声明的 ResponseContent：

public class ResponseContent
{
    public const string ApiVersion = "1.0.0";

    public ResponseContent()
    {
        this.version = ResponseContent.ApiVersion;
        this.action = "Continue";
    }

    public ResponseContent(string action, string userMessage)
    {
        this.version = ResponseContent.ApiVersion;
        this.action = action;
        this.userMessage = userMessage;
    }

    public ResponseContent(string userTypes, string accountIdentifiers, string pricebookAuthorized, string portalAuthorized)
    {
        this.version = ResponseContent.ApiVersion;
        this.action = "Continue";
        this.extension_UserTypes = userTypes;
        this.extension_AccountIdentifiers = accountIdentifiers;
        this.extension_PricebookAuthorized = pricebookAuthorized;
        this.extension_PortalAuthorized = portalAuthorized;
    }

    public string version { get; }
    public string action { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string userMessage { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string extension_UserTypes { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string extension_AccountIdentifiers { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string extension_PricebookAuthorized { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
    public string extension_PortalAuthorized { get; set; }
}

用户流的声明如下：

当我运行这个 Azure 函数使用 Postman 时，返回以下内容：

{
  "version": "1.0.0",
  "action": "Continue",
  "extension_UserTypes": "",
  "extension_AccountIdentifiers": "",
  "extension_PricebookAuthorized": "",
  "extension_PortalAuthorized": ""
}

但是当我尝试运行 Azure 上的用户流时，我得到

Microsoft.Identity.Client.MsalServiceException: AADB2C90261: The claims exchange 'PreSendClaimsRestful' specified in step '2' returned HTTP error response that could not be parsed.

可能出了什么问题，如何诊断？

Answer 1

请检查以下几点是否有帮助：

JSON中的每个键值对都被当作字符串，字符串集合或布尔值。
AADB2C 可能不会反序列化您发送的 JSON 中的声明。一个可能需要反序列化 API 处的字符串，或者必须 return 没有转义字符的嵌套 JSON 对象。
```
   string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
   dynamic data = JsonConvert.DeserializeObject(requestBody);
```

参考：dotnet-external-identities-api-connector-azure-function-validate · GitHub

要解决意外响应问题，请尝试发送 Azure AD B2C logs to Application Insights.

参考文献：

用户流 - API 连接器无法解析响应

User Flow - API connector cannot parse response

azure-ad-b2c