Copying Parts

Functions

After a multipart upload task is created, you can upload parts for this task using the obtained multipart upload ID. Alternatively, you can make an API call to add a part (part of an object or the whole object).

This operation supports server-side encryption.

Important

You cannot determine whether a request is successful only based on the status_code in the returned HTTP header. If 200 is returned for status_code, the server has received the request and started to process the request. The copy is successful only when the body in the response contains ETag.

Copy the source object and save it as part1. If a part1 already exists before the copying, the original part1 will be overwritten by the newly copied part1. After the copy is successful, only the latest part1 is displayed. The old part1 data will be deleted. Therefore, ensure that the target part does not exist or has no value when using the part copy operation. Otherwise, data may be deleted by mistake. The source object in the copy process does not change.

Cold Objects

If source objects are in the Cold storage class, ensure that these objects have been restored before you copy them. If the source object is not restored or is being restored, the copy fails and error 403 Forbidden is returned. The fault is described as follows:

ErrorCode: InvalidObjectState

ErrorMessage: Operation is not valid for the source object's storage class

Request Syntax

PUT /ObjectName?partNumber=partNum&uploadId=UploadID HTTP/1.1
Host: bucketname.obs.region.example.com
Date: date
x-obs-copy-source: sourceobject
x-obs-copy-source-range:bytes=start-end
Authorization: authorization
Content-Length: length

Request Parameters

To copy a part, you need to specify the part number of the target part and the multipart upload task number. Table 1 describes the parameters.

Table 1 Request parameters

Parameter

Description

Mandatory

partNumber

Indicates the ID of a part to be uploaded.

Type: integer

Yes

uploadId

Indicates a multipart upload ID.

Type: string

Yes

Request Headers

In addition the common message headers, the request uses two extended headers. Table 3 describes the common message header.

Table 2 Request headers

Header

Description

Mandatory

x-obs-copy-source

Indicates the source object to be copied.

Type: string

Yes

x-obs-copy-source-range

Indicates the range of bytes (start - end) to be copied from the source object. start indicates the start byte of the part to be copied and end indicates the end byte.

Type: integer

No

x-obs-server-side-encryption-customer-algorithm

Indicates the encryption algorithm for the part copy when SSE-C is used.

Type: string

Example: x-obs-server-side-encryption-customer-algorithm:AES256

Constraint: This header must be used together with x-obs-server-side-encryption-customer-key and x-obs-server-side-encryption-customer-key-MD5.

No. This header is required when SSE-C is used. The encryption algorithm must be the same as that used to initiate multipart upload tasks.

x-obs-server-side-encryption-customer-key

Indicates the key for encrypting the part copy when SSE-C is used.

Type: string

Example: x-obs-server-side-encryption-customer-key:K7QkYpBkM5+hca27fsNkUnNVaobncnLht/rCB2o/9Cw=

Constraint: This header is a Base64-encoded 256-bit key and must be used together with x-obs-server-side-encryption-customer-algorithm and x-obs-server-side-encryption-customer-key-MD5.

No. This header is required when SSE-C is used. The key must be the same as that used to initiate multipart upload tasks.

x-obs-server-side-encryption-customer-key-MD5

Indicates the MD5 value of the key for encrypting the part copy when SSE-C is used. The MD5 value is used to check whether any error occurs during the transmission of the key.

Type: string

Example: x-obs-server-side-encryption-customer-key-MD5:4XvB3tbNTN+tIEVa0/fGaQ==

Constraint: This header is a Base64-encoded 128-bit MD5 value and must be used together with x-obs-server-side-encryption-customer-algorithm and x-obs-server-side-encryption-customer-key.

No. This header is required when SSE-C is used. The MD5 value must be the same as that used to initiate multipart upload tasks.

x-obs-copy-source-server-side-encryption-customer-algorithm

Indicates the algorithm for the source object when SSE-C is used.

Type: string

Example: x-obs-copy-source-server-side-encryption-customer-algorithm:AES256

Constraint: This header must be used together with x-obs-copy-source-server-side-encryption-customer-key and x-obs-copy-source-server-side-encryption-customer-key-MD5.

No. This header is required when SSE-C is used to copy a source object.

x-obs-copy-source-server-side-encryption-customer-key

Indicates the key for decrypting the source object when SSE-C is used.

Type: string

Example: x-obs-copy-source-server-side-encryption-customer-key:K7QkYpBkM5+hca27fsNkUnNVaobncnLht/rCB2o/9Cw=

Constraint: This header is a Base64-encoded 256-bit key and must be used together with x-obs-copy-source-server-side-encryption-customer-algorithm and x-obs-copy-source-server-side-encryption-customer-key-MD5.

No. This header is required when SSE-C is used to copy a source object.

x-obs-copy-source-server-side-encryption-customer-key-MD5

Indicates the MD5 value of the key for the source object when SSE-C is used. The MD5 value is used to check whether any error occurs during the transmission of the key.

Type: string

Example: x-obs-copy-source-server-side-encryption-customer-key-MD5:4XvB3tbNTN+tIEVa0/fGaQ==

Constraint: This header is a Base64-encoded 128-bit MD5 value and must be used together with x-obs-copy-source-server-side-encryption-customer-algorithm and x-obs-copy-source-server-side-encryption-customer-key.

No. This header is required when SSE-C is used to copy a source object.

x-obs-copy-source-if-match

Indicates that the source object is copied only if its ETag matches the one specified in this header. Otherwise, a 412 status code (failed precondition) is returned.

Type: string

Example: x-obs-copy-source-if-match: etag

Constraint: This header can be used with x-obs-copy-source-if-unmodified-since but not other conditional copy headers.

No

x-obs-copy-source-if-none-match

Indicates that the source object is copied only if its ETag does not match the one specified in this header. Otherwise, a 412 status code (failed precondition) is returned.

Type: string

Example: x-obs-copy-source-if-none-match: etag

Constraint: This header can be used with x-obs-copy-source-if-modified-since but not other conditional copy headers.

No

x-obs-copy-source-if-unmodified-since

Indicates that the source object is copied only if it has not been modified since the time specified by this header. Otherwise, a 412 status code (failed precondition) is returned. This header can be used with x-obs-copy-source-if-match but not other conditional copy headers.

Type: string

Format: HTTP time string complying with the format specified at http://www.ietf.org/rfc/rfc2616.txt, which can be any of the following:

  1. EEE, dd MMM yyyy HH:mm:ss z

  2. EEEE, dd-MMM-yy HH:mm:ss z

  3. EEE MMM dd HH:mm:ss yyyy

Examples:

  1. x-obs-copy-source-if-unmodified-since: Sun, 06 Nov 1994 08:49:37 GMT

  2. x-obs-copy-source-if-unmodified-since: Sunday, 06-Nov-94 08:49:37 GMT

  3. x-obs-copy-source-if-unmodified-since: Sun Nov 6 08:49:37 1994

Constraint: The time specified by this header cannot be later than the current server time (GMT time), or this header does not take effect.

No

x-obs-copy-source-if-modified-since

Indicates that the source object is copied only if it has been modified since the time specified by this header. Otherwise, a 412 status code (failed precondition) is returned. This header can be used with x-obs-copy-source-if-none-match but not other conditional copy headers.

Type: string

Format: HTTP time string complying with the format specified at http://www.ietf.org/rfc/rfc2616.txt, which can be any of the following:

  1. EEE, dd MMM yyyy HH:mm:ss z

  2. EEEE, dd-MMM-yy HH:mm:ss z

  3. EEE MMM dd HH:mm:ss yyyy

Examples:

  1. x-obs-copy-source-if-unmodified-since: Sun, 06 Nov 1994 08:49:37 GMT

  2. x-obs-copy-source-if-unmodified-since: Sunday, 06-Nov-94 08:49:37 GMT

  3. x-obs-copy-source-if-unmodified-since: Sun Nov 6 08:49:37 1994

Constraint: The time specified by this header cannot be later than the current server time (GMT time), or this header does not take effect.

No

Request Elements

This request involves no elements.

Response Syntax

HTTP/1.1 status_code
Date: date

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<CopyPartResult xmlns="http://obs.region.example.com/doc/2015-06-30/">
    <LastModified>modifiedDate</LastModified>
    <ETag>etag</ETag>
</CopyPartResult>

Response Headers

The response to the request uses common headers. For details, see Table 1.

Table 3 Additional response headers

Header

Description

x-obs-server-side-encryption

This header is included in a response if SSE-KMS is used.

Type: string

Example: x-obs-server-side-encryption:kms

x-obs-server-side-encryption-kms-key-id

Explanation:

ID of a specified key used for SSE-KMS encryption.

Restrictions:

This header can only be used when you specify kms for the x-obs-server-side-encryption header.

Default value:

If you specify kms for encryption but do not specify a key ID, the default master key will be used. If there is not a default master key, OBS will create one and use it.

x-obs-server-side-encryption-customer-algorithm

Indicates the encryption algorithm. This header is included in a response when SSE-C is used.

Type: string

Example: x-obs-server-side-encryption-customer-algorithm:AES256

x-obs-server-side-encryption-customer-key-MD5

Indicates the MD5 value of the key for encrypting objects. This header is included in a response when SSE-C is used.

Type: string

Example: x-obs-server-side-encryption-customer-key-MD5:4XvB3tbNTN+tIEVa0/fGaQ==

Response Elements

This response contains elements of a part copy result. Table 4 describes the elements.

Table 4 Response elements

Element

Description

LastModified

Indicates the latest time an object was modified.

Type: string

ETag

ETag value of the target part. It is the unique identifier of the part content and is used to verify data consistency when merging parts.

Type: string

Error Responses

  1. If the AK or signature is invalid, OBS returns 403 Forbidden and the error code is AccessDenied.

  2. Check whether the source bucket or destination bucket exists. If the source bucket or destination bucket does not exist, OBS returns 404 Not Found and the error code is NoSuchBucket.

  3. If the source object does not exist, OBS returns 404 Not Found and the error code is NoSuchKey.

  4. If the user does not have the read permission for the specified object, OBS returns 403 Forbidden and the error code is AccessDenied.

  5. If the user does not have the write permission for the destination bucket, OBS returns 403 Forbidden and the error code is AccessDenied.

  6. If the specified task does not exist, OBS returns 404 Not Found and the error code is NoSuchUpload.

  7. If the user is not the initiator of the multipart upload task, OBS returns 403 Forbidden and the error code is AccessDenied.

  8. When the size of a copied part has exceeded 5 GB, OBS returns 400 Bad Request.

  9. If a part number is not within the range from 1 to 10000, OBS returns error code 400 Bad Request.

Other errors are included in Table 2.

Sample Request

PUT /tobject02?partNumber=2&uploadId=00000163D40171ED8DF4050919BD02B8 HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.example.com
Accept: */*
Date: WED, 01 Jul 2015 05:16:32 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:dSnpnNpawDSsLg/xXxaqFzrAmMw=
x-obs-copy-source: /destbucket/object01

Sample Response

HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: 8DF400000163D40ABBD20405D30B0542
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCTIJpD2efLy5o8sTTComwBb2He0j11Ne
Content-Type: application/xml
Date: WED, 01 Jul 2015 05:16:32 GMT
Transfer-Encoding: chunked

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<CopyPartResult xmlns="http://obs.example.com/doc/2015-06-30/">
  <LastModified>2015-07-01T05:16:32.344Z</LastModified>
  <ETag>"3b46eaf02d3b6b1206078bb86a7b7013"</ETag>
</CopyPartResult>
last updated: 2024-12-11 10:27 UTC - commit: 1084b97f9d241d7af788bdfaa536dba9679533f7