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.

ACL types of buckets

The following table describes the bucket ACLs.

ACL	Description	Value
Private	Only the bucket owner and authorized users can perform read and write operations on objects in the bucket. Other users cannot access the objects in the bucket.	oss.ACLPrivate
Public read	Only the bucket owner and authorized users can perform read and write operations on objects in the bucket. Other users can only read objects in the bucket. Exercise caution when you set the ACL to this value.	oss.ACLPublicRead
Public read/write	All users can perform read and write operations on objects in the bucket. Exercise caution when you set the ACL to this value.	oss.ACLPublicReadWrite

Sample code

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

package main

import (
	"log"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func main() {
	// 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. 
	provider, err := oss.NewEnvironmentVariableCredentialsProvider()
	if err != nil {
		log.Fatalf("Failed to create credentials provider: %v", err)
	}

	// Create an OSSClient instance. 
	// 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. Specify your actual endpoint. 
	// Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. Specify the actual region.
	clientOptions := []oss.ClientOption{oss.SetCredentialsProvider(&provider)}
	clientOptions = append(clientOptions, oss.Region("yourRegion"))
	// Specify the version of the signature algorithm.
	clientOptions = append(clientOptions, oss.AuthVersion(oss.AuthV4))
	client, err := oss.New("yourEndpoint", "", "", clientOptions...)
	if err != nil {
		log.Fatalf("Failed to create OSS client: %v", err)
	}

	// Specify the name of the bucket. 
	bucketName := "yourBucketName"

	// Set the ACL of the bucket to public read. 
	err = client.SetBucketACL(bucketName, oss.ACLPublicRead)
	if err != nil {
		log.Fatalf("Failed to set bucket ACL for '%s': %v", bucketName, err)
	}

	// Query the ACL of the bucket. 
	aclRes, err := client.GetBucketACL(bucketName)
	if err != nil {
		log.Fatalf("Failed to get bucket ACL for '%s': %v", bucketName, err)
	}

	log.Printf("Bucket ACL for '%s': %s", bucketName, aclRes.ACL)
}

References

For the complete sample code that is used to manage the ACL of an object, visit GitHub.
For more information about the API operation that you can call to configure the ACL of a bucket, see SetBucketACL.
For more information about the API operation that you can call to query the ACL of a bucket, see GetBucketACL.