通过Bucket Policy授权访问云盒Bucket内的资源

仅支持通过Java SDK设置Bucket Policy，Java SDK要求3.15.0及以上版本。

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.common.auth.CredentialsProviderFactory;
import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;

public class Demo {

    public static void main(String[] args) throws Exception {
        // 填写云盒Bucket的数据域名。
        String endpoint = "https://cb-f8z7yvzgwfkl9q0h****.cn-hangzhou.oss-cloudbox.aliyuncs.com";
        // 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // 填写云盒Bucket名称，例如examplebucket。
        String bucketName = "examplebucket";
        // 填写云盒Bucket所在地域。
        String region = "cn-hangzhou";
        // 填写云盒ID。
        String cloudBoxId = "cb-f8z7yvzgwfkl9q0h****";

        // 创建OSSClient实例。
        ClientBuilderConfiguration conf = new ClientBuilderConfiguration();
        conf.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(new DefaultCredentialProvider(credentialsProvider.getCredentials()))
                .clientConfiguration(conf)
                .region(region)
                .cloudBoxId(cloudBoxId)
                .build();

        try {
            // 填写policyText。
            String policyText = "{\"Statement\": [{\"Effect\": \"Allow\", \"Action\": [\"oss-cloudbox::ListObjectVersions\", \"oss-cloudbox::ListObjects\"], \"Resource\": [\"acs:oss-cloudbox:{region}:{bucket_owner}:cloudbox/{cloudbox_id}/bucket/{bucket_name}/object/{object_name}\"]}], \"Version\": \"1\"}";

            // 设置授权策略。
            ossClient.setBucketPolicy(bucketName, policyText);
        } catch (OSSException oe) {
            System.out.println("Caught an OSSException, which means your request made it to OSS, "
                    + "but was rejected with an error response for some reason.");
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Caught an ClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with OSS, "
                    + "such as not being able to access the network.");
            System.out.println("Error Message:" + ce.getMessage());
        } finally {
            if (ossClient != null) {
                ossClient.shutdown();
            }
        }
    }
}