Method: Aws::S3::Client#create_multipart_upload

Defined in:
lib/aws-sdk-s3/client.rb

#create_multipart_upload(params = {}) ⇒ Types::CreateMultipartUploadOutput

This operation initiates a multipart upload and returns an upload ID. This upload ID is used to associate all of the parts in the specific multipart upload. You specify this upload ID in each of your subsequent upload part requests (see UploadPart). You also include this upload ID in the final request to either complete or abort the multipart upload request.

For more information about multipart uploads, see [Multipart Upload Overview].

If you have configured a lifecycle rule to abort incomplete multipart uploads, the upload must complete within the number of days specified in the bucket lifecycle configuration. Otherwise, the incomplete multipart upload becomes eligible for an abort operation and Amazon S3 aborts the multipart upload. For more information, see [Aborting Incomplete Multipart Uploads Using a Bucket Lifecycle Policy].

For information about the permissions required to use the multipart upload API, see [Multipart Upload API and Permissions].

For request signing, multipart upload is just a series of regular requests. You initiate a multipart upload, send one or more requests to upload parts, and then complete the multipart upload process. You sign each request individually. There is nothing special about signing multipart upload requests. For more information about signing, see [Authenticating Requests (AWS Signature Version 4)].

<note markdown=“1”> After you initiate a multipart upload and upload one or more parts, to stop being charged for storing the uploaded parts, you must either complete or abort the multipart upload. Amazon S3 frees up the space used to store the parts and stop charging you for storing them only after you either complete or abort a multipart upload.

</note>

You can optionally request server-side encryption. For server-side encryption, Amazon S3 encrypts your data as it writes it to disks in its data centers and decrypts it when you access it. You can provide your own encryption key, or use AWS Key Management Service (AWS KMS) customer master keys (CMKs) or Amazon S3-managed encryption keys. If you choose to provide your own encryption key, the request headers you provide in UploadPart) and UploadPartCopy) requests must match the headers you used in the request to initiate the upload by using ‘CreateMultipartUpload`.

To perform a multipart upload with encryption using an AWS KMS CMK, the requester must have permission to the ‘kms:Encrypt`, `kms:Decrypt`, `kms:ReEncrypt*`, `kms:GenerateDataKey*`, and `kms:DescribeKey` actions on the key. These permissions are required because Amazon S3 must decrypt and read data from the encrypted file parts before it completes the multipart upload.

If your AWS Identity and Access Management (IAM) user or role is in the same AWS account as the AWS KMS CMK, then you must have these permissions on the key policy. If your IAM user or role belongs to a different account than the key, then you must have the permissions on both the key policy and your IAM user or role.

For more information, see [Protecting Data Using Server-Side Encryption].

Access Permissions

: When copying an object, you can optionally specify the accounts or

groups that should be granted specific permissions on the new
object. There are two ways to grant the permissions using the
request headers:

* Specify a canned ACL with the `x-amz-acl` request header. For more
  information, see [Canned ACL][6].

* Specify access permissions explicitly with the `x-amz-grant-read`,
  `x-amz-grant-read-acp`, `x-amz-grant-write-acp`, and
  `x-amz-grant-full-control` headers. These parameters map to the
  set of permissions that Amazon S3 supports in an ACL. For more
  information, see [Access Control List (ACL) Overview][7].

You can use either a canned ACL or specify access permissions
explicitly. You cannot do both.

Server-Side- Encryption-Specific Request Headers

: You can optionally tell Amazon S3 to encrypt data at rest using

server-side encryption. Server-side encryption is for data
encryption at rest. Amazon S3 encrypts your data as it writes it to
disks in its data centers and decrypts it when you access it. The
option you use depends on whether you want to use AWS managed
encryption keys or provide your own encryption key.

* Use encryption keys managed by Amazon S3 or customer master keys
  (CMKs) stored in AWS Key Management Service (AWS KMS)

Access-Control-List (ACL)-Specific Request Headers

: You also can use the following access control–related headers with

this operation. By default, all objects are private. Only the owner
has full access control. When adding a new object, you can grant
permissions to individual AWS accounts or to predefined groups
defined by Amazon S3. These permissions are then added to the access
control list (ACL) on the object. For more information, see [Using
ACLs][9]. With this operation, you can grant access permissions
using one of the following two methods:

* Specify a canned ACL (`x-amz-acl`)

The following operations are related to ‘CreateMultipartUpload`:

  • UploadPart

  • CompleteMultipartUpload

  • AbortMultipartUpload

  • ListParts

  • ListMultipartUploads

[1]: docs.aws.amazon.com/AmazonS3/latest/dev/mpuoverview.html [2]: docs.aws.amazon.com/AmazonS3/latest/dev/mpuoverview.html#mpu-abort-incomplete-mpu-lifecycle-config [3]: docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html [4]: docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html [5]: docs.aws.amazon.com/AmazonS3/latest/dev/serv-side-encryption.html [6]: docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#CannedACL [7]: docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html [8]: docs.aws.amazon.com/AmazonS3/latest/dev/UsingKMSEncryption.html [9]: docs.aws.amazon.com/AmazonS3/latest/dev/S3_ACLs_UsingACLs.html

Examples:

Example: To initiate a multipart upload


# The following example initiates a multipart upload.

resp = client.create_multipart_upload({
  bucket: "examplebucket", 
  key: "largeobject", 
})

resp.to_h outputs the following:
{
  bucket: "examplebucket", 
  key: "largeobject", 
  upload_id: "ibZBv_75gd9r8lH_gqXatLdxMVpAlj6ZQjEs.OwyF3953YdwbcQnMA2BLGn8Lx12fQNICtMw5KyteFeHw.Sjng--", 
}

Request syntax with placeholder values


resp = client.create_multipart_upload({
  acl: "private", # accepts private, public-read, public-read-write, authenticated-read, aws-exec-read, bucket-owner-read, bucket-owner-full-control
  bucket: "BucketName", # required
  cache_control: "CacheControl",
  content_disposition: "ContentDisposition",
  content_encoding: "ContentEncoding",
  content_language: "ContentLanguage",
  content_type: "ContentType",
  expires: Time.now,
  grant_full_control: "GrantFullControl",
  grant_read: "GrantRead",
  grant_read_acp: "GrantReadACP",
  grant_write_acp: "GrantWriteACP",
  key: "ObjectKey", # required
  metadata: {
    "MetadataKey" => "MetadataValue",
  },
  server_side_encryption: "AES256", # accepts AES256, aws:kms
  storage_class: "STANDARD", # accepts STANDARD, REDUCED_REDUNDANCY, STANDARD_IA, ONEZONE_IA, INTELLIGENT_TIERING, GLACIER, DEEP_ARCHIVE
  website_redirect_location: "WebsiteRedirectLocation",
  sse_customer_algorithm: "SSECustomerAlgorithm",
  sse_customer_key: "SSECustomerKey",
  sse_customer_key_md5: "SSECustomerKeyMD5",
  ssekms_key_id: "SSEKMSKeyId",
  ssekms_encryption_context: "SSEKMSEncryptionContext",
  request_payer: "requester", # accepts requester
  tagging: "TaggingHeader",
  object_lock_mode: "GOVERNANCE", # accepts GOVERNANCE, COMPLIANCE
  object_lock_retain_until_date: Time.now,
  object_lock_legal_hold_status: "ON", # accepts ON, OFF
})

Response structure


resp.abort_date #=> Time
resp.abort_rule_id #=> String
resp.bucket #=> String
resp.key #=> String
resp.upload_id #=> String
resp.server_side_encryption #=> String, one of "AES256", "aws:kms"
resp.sse_customer_algorithm #=> String
resp.sse_customer_key_md5 #=> String
resp.ssekms_key_id #=> String
resp.ssekms_encryption_context #=> String
resp.request_charged #=> String, one of "requester"

Parameters:

  • params (Hash) (defaults to: {}) —

    ({})

Options Hash (params):

  • :acl (String) —

    The canned ACL to apply to the object.

  • :bucket (required, String) —

    The name of the bucket to which to initiate the upload

  • :cache_control (String) —

    Specifies caching behavior along the request/reply chain.

  • :content_disposition (String) —

    Specifies presentational information for the object.

  • :content_encoding (String) —

    Specifies what content encodings have been applied to the object and thus what decoding mechanisms must be applied to obtain the media-type referenced by the Content-Type header field.

  • :content_language (String) —

    The language the content is in.

  • :content_type (String) —

    A standard MIME type describing the format of the object data.

  • :expires (Time, DateTime, Date, Integer, String) —

    The date and time at which the object is no longer cacheable.

  • :grant_full_control (String) —

    Gives the grantee READ, READ_ACP, and WRITE_ACP permissions on the object.

  • :grant_read (String) —

    Allows grantee to read the object data and its metadata.

  • :grant_read_acp (String) —

    Allows grantee to read the object ACL.

  • :grant_write_acp (String) —

    Allows grantee to write the ACL for the applicable object.

  • :key (required, String) —

    Object key for which the multipart upload is to be initiated.

  • :metadata (Hash<String,String>) —

    A map of metadata to store with the object in S3.

  • :server_side_encryption (String) —

    The server-side encryption algorithm used when storing this object in Amazon S3 (for example, AES256, aws:kms).

  • :storage_class (String) —

    The type of storage to use for the object. Defaults to ‘STANDARD’.

  • :website_redirect_location (String) —

    If the bucket is configured as a website, redirects requests for this object to another object in the same bucket or to an external URL. Amazon S3 stores the value of this header in the object metadata.

  • :sse_customer_algorithm (String) —

    Specifies the algorithm to use to when encrypting the object (for example, AES256).

  • :sse_customer_key (String) —

    Specifies the customer-provided encryption key for Amazon S3 to use in encrypting data. This value is used to store the object and then it is discarded; Amazon S3 does not store the encryption key. The key must be appropriate for use with the algorithm specified in the ‘x-amz-server-side​-encryption​-customer-algorithm` header.

  • :sse_customer_key_md5 (String) —

    Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321. Amazon S3 uses this header for a message integrity check to ensure that the encryption key was transmitted without error.

  • :ssekms_key_id (String) —

    Specifies the ID of the symmetric customer managed AWS KMS CMK to use for object encryption. All GET and PUT requests for an object protected by AWS KMS will fail if not made via SSL or using SigV4. For information about configuring using any of the officially supported AWS SDKs and AWS CLI, see [Specifying the Signature Version in Request Authentication] in the *Amazon S3 Developer Guide*.

    [1]: docs.aws.amazon.com/http:/docs.aws.amazon.com/AmazonS3/latest/dev/UsingAWSSDK.html#specify-signature-version

  • :ssekms_encryption_context (String) —

    Specifies the AWS KMS Encryption Context to use for object encryption. The value of this header is a base64-encoded UTF-8 string holding JSON with the encryption context key-value pairs.

  • :request_payer (String) —

    Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. For information about downloading objects from requester pays buckets, see [Downloading Objects in Requestor Pays Buckets] in the *Amazon S3 Developer Guide*.

    [1]: docs.aws.amazon.com/AmazonS3/latest/dev/ObjectsinRequesterPaysBuckets.html

  • :tagging (String) —

    The tag-set for the object. The tag-set must be encoded as URL Query parameters.

  • :object_lock_mode (String) —

    Specifies the Object Lock mode that you want to apply to the uploaded object.

  • :object_lock_retain_until_date (Time, DateTime, Date, Integer, String) —

    Specifies the date and time when you want the Object Lock to expire.

  • :object_lock_legal_hold_status (String) —

    Specifies whether you want to apply a Legal Hold to the uploaded object.

Returns:

See Also:



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# File 'lib/aws-sdk-s3/client.rb', line 1786

def create_multipart_upload(params = {}, options = {})
  req = build_request(:create_multipart_upload, params)
  req.send_request(options)
end