Copying an Object Version (SDK for Java)

Function

This API copies an object version in a specified bucket.

You can call ObsClient.copyObject to copy an object version by specifying the version ID (versionId).

Restrictions

To copy an object, you must be the bucket owner or have the required permission (obs:object:PutObject in IAM or PutObject in a bucket policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Configuring an Object Policy.
You must have the read permission on the source object.
The object copy request carries the information about the source bucket and object to be copied in the header field. The message body cannot be carried.
Cross-bucket replication in the same region is supported, but cross-region replication is not supported.
An object copy can be up to 5 GB in size. If the source object exceeds 5 GB, you can only perform a multipart copy.
If the source object is in the Archive storage class, you must restore it first.

Method

obsClient.copyObject(CopyObjectRequest request)

Request Parameters

**Table 1** List of request parameters
Parameter	Type	Mandatory (Yes/No)	Description
request	CopyObjectRequest	Yes	Explanation: Request parameters for copying an object. For details, see Table 2.

**Table 2** CopyObjectRequest
Parameter	Type	Mandatory (Yes/No)	Description
bucketName	String	Yes	Explanation: Target bucket name. Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request. Default value: None
objectKey	String	Yes	Explanation: Target object name. An object is uniquely identified by an object name in a bucket. An object name is a complete path that does not contain the bucket name. For example, if the address for accessing the object is examplebucket.obs.eu-west-101.myhuaweicloud.eu/folder/test.txt, the object name is folder/test.txt. Value range: The value must contain 1 to 1,024 characters. Default value: None
sseKmsHeader	SseKmsHeader	No	Explanation: Server-side encryption header used for encrypting the target object. For details, see Table 3. Default value: None
sseCHeader	SseCHeader	No	Explanation: Server-side encryption header used for encrypting the target object. For details, see Table 4. Default value: None
acl	AccessControlList	No	Explanation: ACL that can be pre-defined during the object copy. For details, see Table 8. Default value: None
successRedirectLocation	String	No	Explanation: Address (URL) to which a successfully answered request is redirected. If the value is valid and the request is successful, OBS returns status code 303. Location contains SuccessActionRedirect as well as the bucket name, object name, and object ETag. If the value is invalid, OBS ignores this parameter. In such case, the Location header is the object address, and OBS returns a status code based on whether the operation succeeds or fails. Default value: None
sourceBucketName	String	Yes	Explanation: Name of the source bucket. Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket attributes comply with those set in the first creation request. Default value: None
sourceObjectKey	String	Yes	Explanation: Source object name. An object is uniquely identified by an object name in a bucket. An object name is a complete path that does not contain the bucket name. For example, if the address for accessing the object is examplebucket.obs.eu-west-101.myhuaweicloud.eu/folder/test.txt, the object name is folder/test.txt. Value range: The value must contain 1 to 1,024 characters. Default value: None
newObjectMetadata	ObjectMetadata	No	Explanation: User-defined metadata of the target object. For details, see Table 15. Restrictions: newObjectMetadata must be used together with replaceMetadata. Default value: None
replaceMetadata	boolean	No	Explanation: Whether to rewrite the metadata of the source object. Restrictions: replaceMetadata must be used together with newObjectMetadata. Value range: true: The metadata of the source object is rewritten. false: The metadata of the source object is not rewritten. Default value: None
ifModifiedSince	java.util.Date	No	Explanation: The source object is copied if it has been modified since the specified time; otherwise, an exception is thrown. Default value: None
ifUnmodifiedSince	java.util.Date	No	Explanation: The source object is copied if it has not been modified since the specified time; otherwise, an exception is thrown. Default value: None
ifMatchTag	String	No	Explanation: Preset ETag. If the ETag of the object to be downloaded is the same as the preset ETag, the object is returned. Otherwise, an error is returned. The ETag of the source object is the MD5 value of it. Restrictions: If the object copy request includes ifUnmodifiedSince, ifMatchTag, ifModifiedSince, or ifNoneMatchTag, and the specified condition is not met, the copy will fail and an exception will be thrown with HTTP status code 412 precondition failed returned. ifModifiedSince and ifNoneMatchTag can be used together. So do ifUnmodifiedSince and ifMatchTag. Value range: The value must contain 32 characters. Default value: None
ifNoneMatchTag	String	No	Explanation: Preset ETag. If the ETag of the object to be downloaded is different from the preset ETag, the object is returned. Otherwise, an error is returned. Value range: The value must contain 32 characters. Default value: None
versionId	String	No	Explanation: Version ID of the source object. Value range: The value must contain 32 characters. Default value: None
sseCHeaderSource	SseCHeader	No	Explanation: Server-side decryption header used for decrypting the source object. For details, see Table 4. Default value: None

**Table 3** SseKmsHeader
Parameter	Type	Mandatory (Yes/No)	Description
encryption	ServerEncryption	Yes	Explanation: SSE-KMS is used for encrypting objects on the server side. Value range: kms. For details, see Table 5. Default value: None
sseAlgorithm	SSEAlgorithmEnum	No	Explanation: Encryption algorithm. Restrictions: Only KMS is supported. Value range: See Table 6. Default value: None
kmsKeyId	String	No	Explanation: ID of the KMS master key when SSE-KMS is used. Value range: Valid value formats are as follows: regionID:domainID:key/key_id key_id In the preceding formats: regionID indicates the ID of the region where the key belongs. domainID indicates the ID of the account where the key belongs. To obtain it, see How Do I Get My Account ID and User ID? key_id indicates the ID of the key created on Data Encryption Workshop (DEW). Default value: If this parameter is not specified, the default master key will be used. If there is no such a default master key, OBS will create one and use it by default.

**Table 4** SseCHeader
Parameter	Type	Mandatory (Yes/No)	Description
algorithm	ServerAlgorithm	Yes	Explanation: SSE-C is used for encrypting objects on the server side. Value range: AES256, indicating AES is used to encrypt the object in SSE-C. For details, see Table 7. Default value: None
sseAlgorithm	SSEAlgorithmEnum	No	Explanation: Encryption algorithm. Restrictions: Only AES256 is supported. Value range: See Table 6. Default value: None
sseCKey	byte[]	Yes	Explanation: Key used for encrypting the object when SSE-C is used, in byte[] format. Default value: None
sseCKeyBase64	String	No	Explanation: Base64-encoded key used for encrypting the object when SSE-C is used. Default value: None

**Table 5** ServerEncryption
Constant	Default Value
OBS_KMS	kms

**Table 6** SSEAlgorithmEnum
Constant	Default Value
KMS	kms
AES256	AES256

**Table 7** ServerAlgorithm
Constant	Default Value
AES256	AES256

**Table 8** AccessControlList
Parameter	Type	Mandatory (Yes/No)	Description
owner	Owner	No	Explanation: Bucket owner information. For details, see Table 9.
delivered	boolean	No	Explanation: Whether the bucket ACL is applied to all objects in the bucket. Value range: true: The bucket ACL is applied to all objects in the bucket. false: The bucket ACL is not applied to any objects in the bucket. Default value: false
grants	Set<GrantAndPermission>	No	Explanation: Grantee information. For details, see Table 10.

**Table 9** Owner
Parameter	Type	Mandatory (Yes/No)	Description
id	String	Yes	Explanation: Account (domain) ID of the bucket owner. Value range: To obtain the account ID, see How Do I Get My Account ID and User ID? Default value: None
displayName	String	No	Explanation: Account name of the owner. Value range: To obtain the account name, see How Do I Get My Account ID and User ID? Default value: None

**Table 10** GrantAndPermission
Parameter	Type	Mandatory (Yes/No)	Description
grantee	GranteeInterface	Yes	Explanation: Grantees (users or user groups). For details, see Table 12.
permission	Permission	Yes	Explanation: Permissions to grant. Value range: See Table 11. Default value: None
delivered	boolean	No	Explanation: Whether the bucket ACL is applied to all objects in the bucket. Value range: true: The bucket ACL is applied to all objects in the bucket. false: The bucket ACL is not applied to any objects in the bucket. Default value: false

**Table 11** Permission
Constant	Default Value	Description
PERMISSION_READ	READ	Read permission. A grantee with this permission for a bucket can obtain the list of objects, multipart uploads, bucket metadata, and object versions in the bucket. A grantee with this permission for an object can obtain the object content and metadata.
PERMISSION_WRITE	WRITE	Write permission. A grantee with this permission for a bucket can upload, overwrite, and delete any object or part in the bucket. This permission is not available for objects.
PERMISSION_READ_ACP	READ_ACP	Permission to read an ACL. A grantee with this permission can obtain the ACL of a bucket or object. A bucket or object owner has this permission for their bucket or object by default.
PERMISSION_WRITE_ACP	WRITE_ACP	Permission to modify an ACL. A grantee with this permission can update the ACL of a bucket or object. A bucket or object owner has this permission for their bucket or object by default. This permission allows the grantee to change the access control policies, meaning the grantee has full control over a bucket or object.
PERMISSION_FULL_CONTROL	FULL_CONTROL	Full control access, including read and write permissions for a bucket and its ACL, or for an object and its ACL. A grantee with this permission for a bucket has READ, WRITE, READ_ACP, and WRITE_ACP permissions for the bucket. A grantee with this permission for an object has READ, WRITE, READ_ACP, and WRITE_ACP permissions for the object.

**Table 12** GranteeInterface
Parameter	Type	Mandatory (Yes/No)	Description
CanonicalGrantee	CanonicalGrantee	Yes	Explanation: Grantee (user) information. For details, see Table 13.
GroupGrantee	GroupGrantee	Yes	Explanation: Grantee (user group) information. Value range: See Table 14. Default value: None

**Table 13** CanonicalGrantee
Parameter	Type	Mandatory (Yes/No)	Description
grantId	String	Yes if Type is set to GranteeUser	Explanation: Account (domain) ID of the grantee. Value range: To obtain the account ID, see How Do I Get My Account ID and User ID? Default value: None
displayName	String	No	Parameter description: Account name of the grantee. Value range: To obtain the account name, see How Do I Get My Account ID and User ID? Default value: None

**Table 14** GroupGrantee
Constant	Description
ALL_USERS	All users.
AUTHENTICATED_USERS	Authorized users. This constant is deprecated.
LOG_DELIVERY	Log delivery group. This constant is deprecated.

**Table 15** ObjectMetadata
Parameter	Type	Mandatory (Yes/No)	Description
contentLength	Long	No	Explanation: Object size. Restrictions: The object size in a single upload ranges from 0 to 5 GB. To upload files larger than 5 GB, multipart uploads should be used. Default value: If this parameter is not specified, the SDK automatically calculates the size of the object.
contentType	String	No	Explanation: MIME type of the object file. MIME type is a standard way of describing a data type and is used by the browser to decide how to display data. Value range: See What Is Content-Type (MIME)? (Java SDK) Default value: If this parameter is not specified, the SDK determines the file type based on the suffix of the object name and assigns a value to the parameter. For example, if the suffix of the object name is .xml, the object is an application/xml file. If the suffix is .html, the object is a text/html file.
contentEncoding	String	No	Explanation: Content-Encoding header in the response. It specifies which encoding is applied to the object. Default value: None
contentDisposition	String	No	Explanation: Provides a default file name for the requested object. When the object with the default file name is being downloaded or accessed, the content is displayed as part of a web page in the browser or as an attachment in a download dialog box. Default value: None
cacheControl	String	No	Explanation: Cache-Control header in the response. It specifies the cache behavior of the web page when an object is downloaded. Default value: None
contentLanguage	String	No	Explanation: Language or language combination for visitors to customize and use. For details, see the definition of ContentLanguage in the HTTP protocol. Default value: None
expires	String	No	Explanation: The time a cached web page object expires. Restrictions: The time must be in the GMT format. Default value: None
contentMd5	String	No	Explanation: Base64-encoded MD5 value of the file data. It is provided for the OBS server to verify data integrity. The OBS server will compare this MD5 value with the MD5 value calculated based on the file data. If the two values are not the same, HTTP status code 400 is returned. Restrictions: The MD5 value of the file must be Base64 encoded. If the MD5 value is not specified, the OBS server will not verify the MD5 value of the object. Value range: Base64-encoded 128-bit MD5 value of the request body calculated according to RFC 1864. Example: n58IG6hfM7vqI4K0vnWpog== Default value: None
storageClass	StorageClassEnum	No	Explanation: Storage class of an object that can be specified at object creation. If you do not specify this header, the object inherits the storage class of the bucket. Value range: See Table 16. Default value: None
webSiteRedirectLocation	String	No	Explanation: If the bucket is configured with website hosting, the request for obtaining the object can be redirected to another object in the bucket or an external URL. This parameter specifies the address the request for the object is redirected to. The request is redirected to an object anotherPage.html in the same bucket: WebsiteRedirectLocation:/anotherPage.html The request is redirected to an external URL http://www.example.com/: WebsiteRedirectLocation:http://www.example.com/ Restrictions: The value must start with a slash (/), http://, or https:// and cannot exceed 2 KB. OBS only supports redirection for objects in the root directory of a bucket. Default value: None
nextPosition	long	No	Explanation: Start position for the next append upload. Value range: 0 to the object length, in bytes. Default value: None
appendable	boolean	No	Explanation: Whether the object is appendable. Value range: true: The object is appendable. false: The object is not appendable. Default value: None
userMetadata	Map<String, Object>	No	Explanation: User-defined metadata of the object. To define it, you can add a header starting with x-obs-meta- in the request. In Map, the String key indicates the name of the user-defined metadata that starts with x-obs-meta-, and the Object value indicates the value of the user-defined metadata. To obtain the user-defined metadata of an object, use ObsClient.getObjectMetadata. For details, see Obtaining Object Metadata (SDK for Java). Restrictions: An object can have multiple pieces of metadata. The size of the metadata cannot exceed 8 KB in total. When you call ObsClient.getObject to download an object, its user-defined metadata will also be downloaded. Default value: None

**Table 16** StorageClassEnum
Constant	Default Value	Description
STANDARD	STANDARD	Standard storage class
WARM	WARM	Infrequent Access storage class.
COLD	COLD	Archive storage class.

Responses

**Table 17** CopyObjectResult
Parameter	Type	Description
statusCode	int	Explanation: HTTP status code. Value range: A status code is a group of digits that can be 2xx (indicating successes) or 4xx or 5xx (indicating errors). It indicates the status of a response. For more information, see Status Code. Default value: None
responseHeaders	Map<String, Object>	Explanation: Response header list, composed of tuples. In a tuple, the String key indicates the name of the header, and the Object value indicates the value of the header. Default value: None
lastModified	java.util.Date	Explanation: Last time the target object was modified. Default value: None
etag	String	Explanation: ETag of the target object. Base64-encoded, 128-bit MD5 value of an object. ETag is the unique identifier of the object contents and is used to determine whether the contents of an object are changed. For example, if the ETag value is A when an object is uploaded and is B when the object is downloaded, this indicates the contents of the object are changed. The ETag reflects changes only to the contents of an object, not its metadata. Objects created by the upload and copy operations have unique ETags after being encrypted using MD5. Restrictions: If an object is encrypted using server-side encryption, the ETag is not the MD5 value of the object. Value range: The value must contain 32 characters. Default value: None
versionId	String	Explanation: Version ID of the target object. Value range: The value must contain 32 characters. Default value: None
copySourceVersionId	String	Explanation: Version ID of the source object. Value range: The value must contain 32 characters. Default value: None
storageClass	StorageClassEnum	Explanation: Storage class of the target object. Value range: See Table 16. Default value: None

Code Examples

This example sets a version ID to copy object versions of sourceobjectname from bucket sourceexamplebucket to another bucket.

    
     
       
       
         import com.obs.services.ObsClient;
import com.obs.services.exception.ObsException;
import com.obs.services.model.CopyObjectRequest;
public class CopyObject001 {
    public static void main(String[] args) {
        // Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.
        // Obtain an AK/SK pair on the management console.
        String ak = System.getenv("ACCESS_KEY_ID");
        String sk = System.getenv("SECRET_ACCESS_KEY_ID");
        // (Optional) If you are using a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage.
        // Obtain an AK/SK pair and a security token using environment variables or import them in other ways.
        // String securityToken = System.getenv("SECURITY_TOKEN");
        // Enter the endpoint corresponding to the bucket. EU-Dublin is used here as an example. Replace it with the one in your actual situation.
        String endPoint = "https://obs.eu-west-101.myhuaweicloud.eu"; 
        // Obtain an endpoint using environment variables or import it in other ways.
        //String endPoint = System.getenv("ENDPOINT");
        
        // Create an ObsClient instance.
        // Use the permanent AK/SK pair to initialize the client.
        ObsClient obsClient = new ObsClient(ak, sk,endPoint);
        // Use the temporary AK/SK pair and security token to initialize the client.
        // ObsClient obsClient = new ObsClient(ak, sk, securityToken, endPoint);

        try {
            // Copy object versions.
            CopyObjectRequest request = new CopyObjectRequest();
            request.setSourceBucketName("sourceexamplebucket");
            request.setSourceObjectKey("sourceobjectname");
            // Set the version ID of the object to be copied.
            request.setVersionId("versionid");
            request.setDestinationBucketName("destexamplebucket");
            request.setDestinationObjectKey("destobjectname");
            obsClient.copyObject(request);
            System.out.println("copyObject successfully");
        } catch (ObsException e) {
            System.out.println("copyObject failed");
            // Request failed. Print the HTTP status code.
            System.out.println("HTTP Code:" + e.getResponseCode());
            // Request failed. Print the server-side error code.
            System.out.println("Error Code:" + e.getErrorCode());
            // Request failed. Print the error details.
            System.out.println("Error Message:" + e.getErrorMessage());
            // Request failed. Print the request ID.
            System.out.println("Request ID:" + e.getErrorRequestId());
            System.out.println("Host ID:" + e.getErrorHostId());
            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("copyObject failed");
            // Print other error information.
            e.printStackTrace();
        }
    }
}

        

      

    
   