How to manage object ACLs using OSS SDK for Go 1.0-Object Storage Service(OSS)-阿里云帮助中心

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

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 and Endpoints.
In this topic, access credentials are obtained from environment variables. For more information about how to configure access credentials, see Configure access credentials.
This topic demonstrates creating an OSSClient instance with an OSS endpoint. For alternative configurations, such as using a custom domain or authenticating with credentials from Security Token Service (STS), see Configure a client (Go SDK V1).
To set the ACL for an object, you must have the oss:PutObjectAcl permission. To retrieve the ACL of an object, you must have the oss:GetObjectAcl permission. For more information, see Grant a custom policy.

Sample Code

Configure the ACL of an object

By default, the SetObjectACL operation configures the ACL of the current version of an object. If the current version of the object is a delete marker, OSS returns 404 Not Found. You can specify a version ID in the request to configure the ACL of the specified version of an object.

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

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"
	bucket, err := client.Bucket(bucketName)
	if err != nil {
		log.Fatalf("Failed to get bucket '%s': %v", bucketName, err)
	}

	// Configure the ACL of the specified version of the object.
	// Specify the full path of the object. Do not include the bucket name in the full path.
	objectName := "yourObjectName"
	versionId := "youObjectVersionId"
	acl := oss.ACLPublicReadWrite

	err = bucket.SetObjectACL(objectName, acl, oss.VersionId(versionId))
	if err != nil {
		log.Fatalf("Failed to set object ACL: %v", err)
	}

	log.Printf("Object ACL set successfully for %s with version ID %s", objectName, versionId)
}

Query the ACL of an object

By default, the GetObjectACL operation queries the ACL of the current version of an object. If the current version of the object is a delete marker, 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:

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"
	bucket, err := client.Bucket(bucketName)
	if err != nil {
		log.Fatalf("Failed to get bucket '%s': %v", bucketName, err)
	}

	// Query the ACL of the specified version of the object. 
	// Specify the full path of the object. Do not include the bucket name in the full path.
	objectName := "yourObjectName"
	versionId := "youObjectVersionId"

	aclRes, err := bucket.GetObjectACL(objectName, oss.VersionId(versionId))
	if err != nil {
		log.Fatalf("Failed to get object ACL: %v", err)
	}

	log.Printf("Object ACL: %s", aclRes.ACL)
}

References

For more information about the API operation that you can call to configure the ACL of an object, see SetObjectACL.
For more information about the API operation that you can call to query the ACL of an object, see GetObjectACL.