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, 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 for an object, you must have the
oss:PutObjectAcl
permission. To query object ACLs, you must have theoss:GetObjectAcl
permission. For more information, see Common examples of RAM policies.
Configure the ACL of an object
By default, the PutObjectACL 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 (
"fmt"
"os"
"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 {
fmt.Println("Error:", err)
os.Exit(-1)
}
// 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.
client, err := oss.New("yourEndpoint", "", "", oss.SetCredentialsProvider(&provider))
if err != nil {
fmt.Println("Error:", err)
os.Exit(-1)
}
// Specify the name of the bucket.
bucket, err := client.Bucket("yourBucketName")
if err != nil {
fmt.Println("Error:", err)
os.Exit(-1)
}
// 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.
err = bucket.SetObjectACL("yourObjectName", oss.ACLPublicReadWrite, oss.VersionId("youObjectVersionId"))
if err != nil {
fmt.Println("Error:", err)
os.Exit(-1)
}
}
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 (
"fmt"
"os"
"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 {
fmt.Println("Error:", err)
os.Exit(-1)
}
// 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.
client, err := oss.New("yourEndpoint", "", "", oss.SetCredentialsProvider(&provider))
if err != nil {
fmt.Println("Error:", err)
os.Exit(-1)
}
// Specify the name of the bucket.
bucket, err := client.Bucket("yourBucketName")
if err != nil {
fmt.Println("Error:", err)
os.Exit(-1)
}
// 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.
aclRes, err := bucket.GetObjectACL("yourObjectName", oss.VersionId("youObjectVersionId"))
if err != nil {
fmt.Println("Error:", err)
os.Exit(-1)
}
fmt.Println("Object ACL:", aclRes.ACL)
}
References
For more information about the API operation that you can call to configure the ACL of an object, see PutObjectACL.
For more information about the API operation that you can call to query the ACL of an object, see GetObjectACL.