Object - Amazon Simple Storage Service

Object

An object consists of data and its descriptive metadata.

Contents

ETag

The entity tag is a hash of the object. The ETag reflects changes only to the contents of an object, not its metadata. The ETag may or may not be an MD5 digest of the object data. Whether or not it is depends on how the object was created and how it is encrypted as described below:

  • Objects created by the PUT Object, POST Object, or Copy operation, or through the AWS Management Console, and are encrypted by SSE-S3 or plaintext, have ETags that are an MD5 digest of their object data.

  • Objects created by the PUT Object, POST Object, or Copy operation, or through the AWS Management Console, and are encrypted by SSE-C or SSE-KMS, have ETags that are not an MD5 digest of their object data.

  • If an object is created by either the Multipart Upload or Part Copy operation, the ETag is not an MD5 digest, regardless of the method of encryption.

Type: String

Required: No

Key

The name that you assign to an object. You use the object key to retrieve the object.

Type: String

Length Constraints: Minimum length of 1.

Required: No

LastModified

Creation date of the object.

Type: Timestamp

Required: No

Owner

The owner of the object

Type: Owner data type

Required: No

Size

Size in bytes of the object

Type: Integer

Required: No

StorageClass

The class of storage used to store the object.

Type: String

Valid Values: STANDARD | REDUCED_REDUNDANCY | GLACIER | STANDARD_IA | ONEZONE_IA | INTELLIGENT_TIERING | DEEP_ARCHIVE | OUTPOSTS | GLACIER_IR

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: