Manage bucket ACLs - Object Storage Service - Alibaba Cloud Documentation Center

A bucket is a container for objects stored in Object Storage Service (OSS). All objects in OSS are stored in buckets. This topic describes how to configure and query the access control list (ACL) of a bucket.

Usage notes

In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions, endpoints and open ports.
In this topic, access credentials are obtained from environment variables. For more information about how to configure access credentials, see Configure access credentials.
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 Initialization.
To configure the ACL of a bucket, you must have the oss:PutBucketAcl permission. To query the ACL of a bucket, you must have the oss:GetBucketAcl permission. For more information, see Attach a custom policy to a RAM user.

Configure the ACL of a bucket

The following table describes the bucket ACLs.

ACL	Description	Method
Private	Only the bucket owner and authorized users have read and write permissions on objects in the bucket. Other users cannot access the objects in the bucket.	oss2.BUCKET_ACL_PRIVATE
Public-read	Only the bucket owner and authorized users have read and write permissions on objects in the bucket. Other users have only read permissions on the objects in the bucket. Exercise caution when you set the ACL to this value.	oss2.BUCKET_ACL_PUBLIC_READ
Public-read-write	All users have read and write permissions on the objects in the bucket. Exercise caution when you set the ACL to this value.	oss2.BUCKET_ACL_PUBLIC_READ_WRITE

The following sample code provides an example on how to configure the ACL of a bucket:

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
# Obtain access credentials from the environment variables. Before you run the sample code, make sure that you have configured environment variables OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# 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. 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Specify the ID of the region that maps to the endpoint. Example: cn-hangzhou. This parameter is required if you use the signature algorithm V4.
region = "cn-hangzhou"

# Specify the name of your bucket.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

# Set the ACL of the bucket to private. 
bucket.put_bucket_acl(oss2.BUCKET_ACL_PRIVATE)

Query the ACL of a bucket

The following sample code provides an example on how to query the ACL of a bucket:

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
# Obtain access credentials from the environment variables. Before you run the sample code, make sure that you have configured environment variables OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# 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. 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Specify the ID of the region that maps to the endpoint. Example: cn-hangzhou. This parameter is required if you use the signature algorithm V4.
region = "cn-hangzhou"

# Specify the name of your bucket.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

# Query the ACL of the bucket. 
print(bucket.get_bucket_acl().acl)

References

For the complete sample code for managing the ACL of a bucket, visit GitHub.
For more information about the API operation for configuring the ACL of a bucket, see PutBucketAcl.
For more information about the API operation for querying the ACL of a bucket, see GetBucketAcl.