Objects: compose

Concatenates a list of existing objects into a new object in the same bucket. Try it now.

There is a limit (currently 32) to the number of components that can be composed in a single operation.

The authenticated user must have sufficient permission to use this method.

To compose objects encrypted by a customer-supplied encryption key, use the headers listed on the Encryption page in your request.

Request

HTTP request

POST https://storage.googleapis.com/storage/v1/b/bucket/o/destinationObject/compose

Parameters

Parameter name	Value	Description
Path parameters
`bucket`	`string`	Name of the bucket containing the source objects. The destination object is stored in this bucket.
`destinationObject`	`string`	Name of the new object. For information about how to URL encode object names to be path safe, see Encoding URI path parts.
Optional query parameters
`destinationPredefinedAcl`	`string`	Apply a predefined set of access controls to the destination object. Acceptable values are: "`authenticatedRead`": Object owner gets `OWNER` access, and `allAuthenticatedUsers` get `READER` access. "`bucketOwnerFullControl`": Object owner gets `OWNER` access, and project team owners get `OWNER` access. "`bucketOwnerRead`": Object owner gets `OWNER` access, and project team owners get `READER` access. "`private`": Object owner gets `OWNER` access. "`projectPrivate`": Object owner gets `OWNER` access, and project team members get access according to their roles. "`publicRead`": Object owner gets `OWNER` access, and `allUsers` get `READER` access. If `iamConfiguration.uniformBucketLevelAccess.enabled` is set to `true`, requests that include this parameter fail with a `400 Bad Request` response.
`ifGenerationMatch`	`long`	Makes the operation conditional on whether the object's current generation matches the given value. Setting to 0 makes the operation succeed only if there are no live versions of the object.
`ifMetagenerationMatch`	`long`	Makes the operation conditional on whether the object's current metageneration matches the given value.
`kmsKeyName`	`string`	Resource name of the Cloud KMS key that will be used to encrypt the object. Overrides the object metadata's `kms_key_name` value, if any.
`userProject`	`string`	The project to be billed for this request. Required for Requester Pays buckets.

Request body

In the request body, supply data with the following structure:

{
  "kind": "storage#composeRequest",
  "sourceObjects": [
    {
      "name": string,
      "generation": long,
      "objectPreconditions": {
        "ifGenerationMatch": long
      }
    }
  ],
  "destination": objects Resource
}

Property name	Value	Description	Notes
`kind`	`string`	The kind of item this is.
`destination`	`nested object`	Properties of the resulting object.	writable
`sourceObjects[]`	`list`	The list of source objects that will be concatenated into a single object.
`sourceObjects[].name`	`string`	The source object's name. All source objects must have the same storage class and reside in the same bucket.	writable
`sourceObjects[].generation`	`long`	The generation of this object to use as the source.	writable
`sourceObjects[].objectPreconditions`	`object`	Conditions that must be met for this operation to execute.
`sourceObjects[].objectPreconditions.ifGenerationMatch`	`long`	Only perform the composition if the generation of the source object that would be used matches this value. If this value and a generation are both specified, they must be the same value or the call will fail.	writable

Response

If successful, this method returns an object resource in the response body, with the owner and acl properties omitted.

Try it!

Use the APIs Explorer below to call this method on live data and see the response.

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上次更新日期：十二月 4, 2019