Object Storage Service:Copy objects (OSS SDK for Go V2)

Usage notes

• The sample code in this topic uses the China (Hangzhou) region ID, cn-hangzhou. By default, the public endpoint is used to access resources in a bucket. If you want to access resources in the bucket from other Alibaba Cloud services in the same region as the bucket, use the internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.

• In this topic, access credentials are retrieved from environment variables. For more information about how to configure access credentials, see Configure access credentials.

• To copy an object, you must have read permissions on the source object and read and write permissions on the destination bucket.

• The source bucket and destination bucket must be located in the same region. For example, objects in a bucket located in the China (Hangzhou) region cannot be copied to another bucket located in the China (Qingdao) region.

• Make sure that no retention policies are configured for the source bucket and the destination bucket. Otherwise, the following error message is returned: The object you specified is immutable.

Permissions

By default, an Alibaba Cloud account has full permissions. RAM users or RAM roles under an Alibaba Cloud account do not have any permissions by default. The Alibaba Cloud account or account administrator must grant operation permissions through RAM Policy or Bucket Policy.

Method

func (c *Client) CopyObject(ctx context.Context, request *CopyObjectRequest, optFns ...func(*Options)) (*CopyObjectResult, error)

Request parameters

Common parameters of CopyObjectRequest

Response parameters

Example

The following sample code provides an example of how to copy an object smaller than 5 GiB from a source bucket to a destination bucket.

package main

import (
	"context"
	"flag"
	"log"

	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss"
	"github.com/aliyun/alibabacloud-oss-go-sdk-v2/oss/credentials"
)

// Specify the global variables.
var (
	region         string // The region.
	srcBucketName  string // The name of the source bucket.
	srcObjectName  string // The name of the source object.
	destBucketName string // The name of the destination bucket.
	destObjectName string // The name of the destination object.
)

// Specify the init function used to initialize command line parameters.
func init() {
	flag.StringVar(&region, "region", "", "The region in which the bucket is located.")
	flag.StringVar(&srcBucketName, "src-bucket", "", "The name of the source bucket.")
	flag.StringVar(&srcObjectName, "src-object", "", "The name of the source object.")
	flag.StringVar(&destBucketName, "dest-bucket", "", "The name of the destination bucket.")
	flag.StringVar(&destObjectName, "dest-object", "", "The name of the destination object.")
}

func main() {
	// Parse command line parameters.
	flag.Parse()

	// Check whether the source bucket name is empty.
	if len(srcBucketName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, source bucket name required")
	}

	// Check whether the region is empty.
	if len(region) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, region required")
	}

	// If the destination bucket name is not specified, the source bucket name is used.
	if len(destBucketName) == 0 {
		destBucketName = srcBucketName
	}

	// Check whether the source object name is empty.
	if len(srcObjectName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, source object name required")
	}

	// Check whether the destination object name is empty.
	if len(destObjectName) == 0 {
		flag.PrintDefaults()
		log.Fatalf("invalid parameters, destination object name required")
	}

	// Load the default configurations and specify the credential provider and region.
	cfg := oss.LoadDefaultConfig().
		WithCredentialsProvider(credentials.NewEnvironmentVariableCredentialsProvider()).
		WithRegion(region)

	// Create an OSS client.
	client := oss.NewClient(cfg)

	// Create a request to copy an object.
	request := &oss.CopyObjectRequest{
		Bucket:       oss.Ptr(destBucketName), // The name of the destination bucket.
		Key:          oss.Ptr(destObjectName), // The name of the destination object.
		SourceKey:    oss.Ptr(srcObjectName),  // The name of the source object.
		SourceBucket: oss.Ptr(srcBucketName),  // The name of the source bucket.
	}

	// Copy the source object and process the results.
	result, err := client.CopyObject(context.TODO(), request)
	if err != nil {
		log.Fatalf("failed to copy object %v", err)
	}
	log.Printf("copy object result:%#v\n", result)
}

References

• For the complete sample code to copy an object, see GitHub Example.

• For more information about the API operation for copying an object, see CopyObject.