1      背景介绍

OBS桶策略可以给特定用户设置特定的权限。下面代码展示通过JAVA SDK给用户桶设置高级桶策略。

2      代码展示

需要先下载OBS最新的JAVA SDK，参考官网链接：https://developer.huaweicloud.com/sdk?OBS，并在自己的项目中导入SDK中的JAR包。

前提条件：已创建OBS桶，例如my-bucket123

设置的桶策略为：给用户userB给予桶的所有权限和桶内所有对象的读权限

桶策略格式如下，其中domain和user请根据实际账号ID和用户ID进行配置：

{

  "Statement": [

    {

      "Sid": "Stmt1375240018062",

      "Action": [

        "*"

      ],

      "Effect": "Allow",

      "Resource": "my-bucket123",

      "Principal": {

        "ID": [

          "domain/c41**************************8cf:user/053**************************2c4 "

        ]

      }

    },

    {

      "Sid": "Stmt1375240018063",

      "Action": [

        "Get*"

      ],

      "Effect": "Allow",

      "Resource": "my-bucket123/*",

      "Principal": {

        "ID": [

          "domain/c41**************************8cf:user/053**************************2c4 "

        ]

      }

    }

  ]

}

Demo代码如下：

 package samples_java;
import com.obs.services.ObsClient;
import com.obs.services.ObsConfiguration;
import com.obs.services.exception.ObsException;
import java.io.IOException;

public class BucketTestSample {
     private static final String endPoint = "XXX";

     private static final String ak = "XXX";

     private static final String sk = "XXX";

     private static ObsClient obsClient;

     private static String bucketName = "my-bucket123";
     
     public static void main(String[] args)
             throws IOException {
         ObsConfiguration config = new ObsConfiguration();
         config.setSocketTimeout(30000);
         config.setConnectionTimeout(10000);
         config.setEndPoint(endPoint);
         try {

             obsClient = new ObsClient(ak, sk, config);

             String  Policy = "{\"Statement\":[{\"Sid\":\"Stmt1375240018062\",\"Action\":[\"*\"],\"Effect\":\"Allow\",\"Resource\":\"my-bucket123\",\"Principal\":{\"ID\":[\"domain/c41**************************8cf:user/053**************************2c4\"]}},{\"Sid\":\"Stmt1375240018063\",\"Action\":[\"Get*\"],\"Effect\":\"Allow\",\"Resource\":\"my-bucket123/*\",\"Principal\":{\"ID\":[\"domain/c41**************************8cf:user/053**************************2c4\"]}}]}";

             obsClient.setBucketPolicy(bucketName,Policy);

         } catch (ObsException e) {
             System.out.println("Response Code: " + e.getResponseCode());
             System.out.println("Error Message: " + e.getErrorMessage());
             System.out.println("Error Code:       " + e.getErrorCode());
             System.out.println("Request ID:      " + e.getErrorRequestId());
             System.out.println("Host ID:           " + e.getErrorHostId());
         } finally {
             if (obsClient != null) {
                 try {
                     obsClient.close();
                 } catch (IOException e) {
                     System.out.println(e);
                 }
             }
         }
     }
 }

3      效果展示

设置后的桶策略如下：

userB在桶内上传文件失败（没有权限），下载文件成功

4      附录

OBS JAVA SDK使用，官网参考链接：https://support.huaweicloud.com/sdkreference-obs/obs_02_0001.html

更多桶策略的具体格式（JSON格式字符串）请参考《对象存储服务API参考》：https://support.huaweicloud.com/api-obs/zh-cn_topic_0100846742.html