# 查询策略列表 - ListPolicy
#### 功能介绍
查询策略列表
#### 调用方法
请参见[如何调用API](https://support.huaweicloud.com/api-aad/aad_02_0007.html)。
#### 授权信息
账号具备所有API的调用权限，如果使用账号下的IAM用户调用当前API，该IAM用户需具备调用API所需的权限。
- 如果使用角色与策略授权，具体权限要求请参见[权限和授权项](https://support.huaweicloud.com/api-aad/abcd.html)。
- 如果使用身份策略授权，需具备如下身份策略权限。
  
  | 授权项              | 访问级别 | 资源类型（\*为必须） | 条件键 | 别名 | 依赖的授权项 |
  |:---|:---|:---|:---|:---|:---|
  | cnad:policy:list | List | policy \*   | -   | -  | -      |
     
  
 
#### URI
GET /v1/cnad/policies
表1Query参数 
| 参数          | 是否必选 | 参数类型    | 描述                 |
|:---|:---|:---|:---|
| offset      | 否    | Integer | 开始查询的偏移量,默认值:0     |
| limit       | 否    | Integer | 每页显示的条目数量,默认值:2000 |
| policy_name | 否    | String  | 策略名                |
   
#### 请求参数
表2请求Header参数 
| 参数           | 是否必选 | 参数类型   | 描述                                                                                      |
|:---|:---|:---|:---|
| X-Auth-Token | 是    | String | 用户Token。 通过调用IAM服务获取用户Token接口获取（响应消息头中X-Subject-Token的值）。 |
| Content-Type | 是    | String | Content-Type                                                                            |
   
#### 响应参数
**状态码：200**
表3响应Body参数 
| 参数    | 参数类型                                                                    | 描述   |
|:---|:---|:---|
| total | Integer                                                                 | 总数   |
| items | Array of [PolicyResponse] objects | 策略列表 |
   
 表4PolicyResponse 
| 参数               | 参数类型    | 描述          |
|:---|:---|:---|
| id               | String  | id          |
| package_id       | String  | 实例id        |
| package_name     | String  | 实例名         |
| name             | String  | 策略名         |
| region           | String  | 所属region的id |
| clean_threshold  | Integer | 清洗阈值        |
| num_protected_ip | Integer | 防护ip数       |
   
#### 请求示例
无
#### 响应示例
**状态码：200**
OK
```
{
  "items" : [ {
    "clean_threshold" : 120,
    "id" : "798d8975-f7cf-490f-b990-747ebaf41248",
    "name" : "sadf",
    "num_protected_ip" : 0,
    "package_id" : "09b5ae8e-ae05-49ff-80fc-8bdf68c16499",
    "package_name" : "测试",
    "region" : "cn-north-4"
  } ],
  "total" : 1
}
```
#### SDK代码示例
SDK代码示例如下。
- [Java]
  ```
  package com.huaweicloud.sdk.test;
  import com.huaweicloud.sdk.core.auth.ICredential;
  import com.huaweicloud.sdk.core.auth.GlobalCredentials;
  import com.huaweicloud.sdk.core.exception.ConnectionException;
  import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
  import com.huaweicloud.sdk.core.exception.ServiceResponseException;
  import com.huaweicloud.sdk.aad.v1.region.AadRegion;
  import com.huaweicloud.sdk.aad.v1.*;
  import com.huaweicloud.sdk.aad.v1.model.*;
  public class ListPolicySolution {
      public static void main(String[] args) {
          // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
          // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
          String ak = System.getenv("CLOUD_SDK_AK");
          String sk = System.getenv("CLOUD_SDK_SK");
          ICredential auth = new GlobalCredentials()
                  .withAk(ak)
                  .withSk(sk);
          AadClient client = AadClient.newBuilder()
                  .withCredential(auth)
                  .withRegion(AadRegion.valueOf("<YOUR REGION>"))
                  .build();
          ListPolicyRequest request = new ListPolicyRequest();
          try {
              ListPolicyResponse response = client.listPolicy(request);
              System.out.println(response.toString());
          } catch (ConnectionException e) {
              e.printStackTrace();
          } catch (RequestTimeoutException e) {
              e.printStackTrace();
          } catch (ServiceResponseException e) {
              e.printStackTrace();
              System.out.println(e.getHttpStatusCode());
              System.out.println(e.getRequestId());
              System.out.println(e.getErrorCode());
              System.out.println(e.getErrorMsg());
          }
      }
  }
  ```
- [Python]
  ```
  # coding: utf-8
  import os
  from huaweicloudsdkcore.auth.credentials import GlobalCredentials
  from huaweicloudsdkaad.v1.region.aad_region import AadRegion
  from huaweicloudsdkcore.exceptions import exceptions
  from huaweicloudsdkaad.v1 import *
  if __name__ == "__main__":
      # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
      # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
      ak = os.environ["CLOUD_SDK_AK"]
      sk = os.environ["CLOUD_SDK_SK"]
      credentials = GlobalCredentials(ak, sk)
      client = AadClient.new_builder() \
          .with_credentials(credentials) \
          .with_region(AadRegion.value_of("<YOUR REGION>")) \
          .build()
      try:
          request = ListPolicyRequest()
          response = client.list_policy(request)
          print(response)
      except exceptions.ClientRequestException as e:
          print(e.status_code)
          print(e.request_id)
          print(e.error_code)
          print(e.error_msg)
  ```
- [Go]
  ```
  package main
  import (
  "fmt"
  "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/global"
      aad "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/aad/v1"
  "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/aad/v1/model"
      region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/aad/v1/region"
  )
  func main() {
      // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
      // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
      ak := os.Getenv("CLOUD_SDK_AK")
      sk := os.Getenv("CLOUD_SDK_SK")
      auth, err := global.NewCredentialsBuilder().
          WithAk(ak).
          WithSk(sk).
          SafeBuild()
      if err != nil {
          fmt.Println(err)
          return
      }
      hcClient, err := aad.AadClientBuilder().
           WithRegion(region.ValueOf("<YOUR REGION>")).
           WithCredential(auth).
           SafeBuild()
      if err != nil {
          fmt.Println(err)
          return
      }
      client := aad.NewAadClient(hcClient)
      request := &model.ListPolicyRequest{}
  response, err := client.ListPolicy(request)
  if err == nil {
          fmt.Printf("%+v\n", response)
      } else {
          fmt.Println(err)
      }
  }
  ```
- [更多]
  更多编程语言的SDK代码示例，请参见[API Explorer](https://console.huaweicloud.com/apiexplorer/#/openapi/AAD/sdk?api=ListPolicy)的代码示例页签，可生成自动对应的SDK代码示例。
#### 状态码
| 状态码 | 描述           |
|:---|:---|
| 200 | OK           |
| 401 | Unauthorized |
| 403 | Forbidden    |
| 404 | Not Found    |
   
#### 错误码
请参见[错误码](https://support.huaweicloud.com/api-aad/ErrorCode.html)。