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Object Storage Service:Manage object ACLs

Last Updated:Oct 19, 2023

This topic describes how to manage the access control lists (ACLs) of objects in a versioned bucket.

Usage notes

  • In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS by using other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about the regions and endpoints supported by OSS, see Regions and endpoints.

  • In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Create an OSSClient instance.

  • To configure the ACL for an object, you must have the oss:PutObjectAcl permission. To query object ACLs, you must have the oss:GetObjectAcl permission. For more information, see Attach a custom policy to a RAM user.

Configure the ACL of an object

By default, the PutObjectACL operation is called to configure the ACL of the current version of an object. If the current version of the object is a delete marker, Object Storage Service (OSS) returns 404 Not Found. You can specify a version ID in the request to configure the ACL of a specified version of an object.

The following code provides an example on how to configure the ACL of an object:

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* Initialize information about the account that is used to access OSS. */
            
    /* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "yourEndpoint";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. */
    std::string ObjectName = "exampledir/exampleobject.txt";


    /* Initialize resources such as network resources. */
    InitializeSdk();

    ClientConfiguration conf;
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);

    /* Configure the ACL of the object. */
    SetObjectAclRequest request(BucketName, ObjectName);
    request.setAcl(CannedAccessControlList::Private);
    request.setVersionId("yourObjectVersionId");
    auto outcome = client.SetObjectAcl(request);

    /* Display the version ID of the object for which you configure ACL. */
    if (outcome.isSuccess()) {
        std::cout << "versionid:" << outcome.result().VersionId() << std::endl;
    }
    else {
        /* Handle exceptions. */
        std::cout << "SetObjectAcl fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /* Release resources such as network resources. */
    ShutdownSdk();
    return 0;
}

Query the ACL of an object

By default, the GetObjectACL operation is called to query the ACL of the current version of an object. If the current version of the object is a delete marker, Object Storage Service (OSS) returns 404 Not Found. You can specify a version ID in the request to query the ACL of the specified version of an object.

The following code provides an example on how to query the ACL of an object:

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* Initialize information about the account that is used to access OSS. */
            
    /* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
    std::string Endpoint = "yourEndpoint";
    /* Specify the name of the bucket. Example: examplebucket. */
    std::string BucketName = "examplebucket";
    /* Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. */
    std::string ObjectName = "exampledir/exampleobject.txt";

    /* Initialize resources such as network resources. */
    InitializeSdk();

    ClientConfiguration conf;
    /* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);

    /* Query the ACL of the object. */
    GetObjectAclRequest request(BucketName, ObjectName);
    request.setVersionId("yourObjectVersionId");
    auto outcome = client.GetObjectAcl(request);

    /* Display the version ID of the object whose ACL is queried. */
    if (outcome.isSuccess()) {
        std::cout << "GetObjectAcl success versionid:"
        << outcome.result().VersionId()
        << "Acl:" << outcome.result().Acl() << std::endl;
    }
    else {
        /* Handle exceptions. */
        std::cout << "GetObjectAcl fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /* Release resources such as network resources. */
    ShutdownSdk();
    return 0;
}

References

  • For more information about the API operation that you can call to configure object ACLs, see PutObjectACL.

  • For more information about the API operation that you can call to query object ACLs, see GetObjectACL.