API 管理条件流策略答案

【问题标题】：API Management Conditional Flow PolicyAPI 管理条件流策略
【发布时间】：2020-01-28 09:33:36
【问题描述】：

我有以下请求数据

{
   "id": "1115e297-12de-4189-8e11-75a8354f77d6",
   "type": "transaction",
   "version": "1.0.0",
   "data": {
      "account_id": "999",
      "customer_info": {
         "client_id": 999
      },
      "company_id": "999999",
      "event": {
         "id": 99999999,
         "type_code": "3098"
      }
   }
}

我想编写一个忽略请求的策略，除非类型是“事务”并且 type_code 是“3098”或“3099”

如果不满足，那么它应该只是将请求的 id 返回给调用者，而不是转发请求

这是我想出来的

    <choose>
            <when condition="@((string)context.Request.Body?.As<JObject>(true)["type"] != "transaction")">
                <return-response>
                    <set-status code="200" reason="OK" />
                    <set-header name="Content-Type" exists-action="override">
                        <value>application/json</value>
                    </set-header>
                    <set-body>@{ 
                        var json = new JObject( 
                            new JProperty("id", context.Request.Body?.As<JObject>(true)["id"])
                        ); 

                        return json.ToString(); 
                    }</set-body>
                </return-response>
            </when>
            <when condition="@(context.Request.Body?.As<JObject>(true)["data"] == null || context.Request.Body?.As<JObject>(true)["data"]["event"] == null)">
                <return-response>
                    <set-status code="200" reason="OK" />
                    <set-header name="Content-Type" exists-action="override">
                        <value>application/json</value>
                    </set-header>
                    <set-body>@{ 
                        var json = new JObject( 
                            new JProperty("id", context.Request.Body?.As<JObject>(true)["id"])
                        ); 

                        return json.ToString(); 
                    }</set-body>
                </return-response>
            </when>
            <when condition="@((int)context.Request.Body?.As<JObject>(true)["data"]["event"]["type_code"] != 3098 && (int)context.Request.Body?.As<JObject>(true)["data"]["event"]["type_code"] != 3099)">
                <return-response>
                    <set-status code="200" reason="OK" />
                    <set-header name="Content-Type" exists-action="override">
                        <value>application/json</value>
                    </set-header>
                    <set-body>@{ 
                        var json = new JObject( 
                            new JProperty("id", context.Request.Body?.As<JObject>(true)["id"])
                        ); 

                        return json.ToString(); 
                    }</set-body>
                </return-response>
            </when>
        </choose>

我提示有一种更优雅的方法可以做到这一点？

【问题讨论】：

标签： azure-api-management api-management

【解决方案1】：

当然。如果您的所有return-response 策略都相同，您可以使用多行表达式：

<set-variable name="payload" value="@((string)context.Request.Body?.As<JObject>(true))" />
<choose>
    <when condition="@{
        var payload = (JObject)context.Variables["payload"];
        if (payload?["type"] != "transaction"
            || payload?["data"]?["event"]?["type_code"] != 3099)
        {
            return true;
        }
    }">
        <return-response>
            <set-status code="200" reason="OK" />
            <set-header name="Content-Type" exists-action="override">
                <value>application/json</value>
            </set-header>
            <set-body>@{ 
                var payload = (JObject)context.Variables["payload"];

                var json = new JObject( 
                    new JProperty("id", payload?["id"])
                ); 

                return json.ToString(); 
            }</set-body>
        </return-response>
    </when>
</choose>

【讨论】：