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Showing content from https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetBucketEncryption.html below:

GetBucketEncryption - Amazon Simple Storage Service

GetBucketEncryption

Returns the default encryption configuration for an Amazon S3 bucket. By default, all buckets have a default encryption configuration that uses server-side encryption with Amazon S3 managed keys (SSE-S3).

Permissions

General purpose bucket permissions - The s3:GetEncryptionConfiguration permission is required in a policy. The bucket owner has this permission by default. The bucket owner can grant this permission to others. For more information about permissions, see Permissions Related to Bucket Operations and Managing Access Permissions to Your Amazon S3 Resources.
Directory bucket permissions - To grant access to this API operation, you must have the s3express:GetEncryptionConfiguration permission in an IAM identity-based policy instead of a bucket policy. Cross-account access to this API operation isn't supported. This operation can only be performed by the AWS account that owns the resource. For more information about directory bucket policies and permissions, see AWS Identity and Access Management (IAM) for S3 Express One Zone in the Amazon S3 User Guide.

HTTP Host header syntax

Directory buckets - The HTTP Host header syntax is s3express-control.region-code.amazonaws.com.

The following operations are related to GetBucketEncryption:

Important

You must URL encode any signed header values that contain spaces. For example, if your header value is my file.txt, containing two spaces after my, you must URL encode this value to my%20%20file.txt.

Request Syntax

GET /?encryption HTTP/1.1
Host: Bucket.s3.amazonaws.com
x-amz-expected-bucket-owner: ExpectedBucketOwner

URI Request Parameters

The request uses the following URI parameters.

The name of the bucket from which the server-side encryption configuration is retrieved.

Directory buckets - When you use this operation with a directory bucket, you must use path-style requests in the format https://s3express-control.region-code.amazonaws.com/bucket-name . Virtual-hosted-style requests aren't supported. Directory bucket names must be unique in the chosen Zone (Availability Zone or Local Zone). Bucket names must also follow the format bucket-base-name--zone-id--x-s3 (for example, DOC-EXAMPLE-BUCKET--usw2-az1--x-s3). For information about bucket naming restrictions, see Directory bucket naming rules in the Amazon S3 User Guide

Required: Yes

The account ID of the expected bucket owner. If the account ID that you provide does not match the actual owner of the bucket, the request fails with the HTTP status code 403 Forbidden (access denied).

Note

For directory buckets, this header is not supported in this API operation. If you specify this header, the request fails with the HTTP status code 501 Not Implemented.

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200
<?xml version="1.0" encoding="UTF-8"?>
<ServerSideEncryptionConfiguration>
   <Rule>
      <ApplyServerSideEncryptionByDefault>
         <KMSMasterKeyID>string</KMSMasterKeyID>
         <SSEAlgorithm>string</SSEAlgorithm>
      </ApplyServerSideEncryptionByDefault>
      <BucketKeyEnabled>boolean</BucketKeyEnabled>
   </Rule>
   ...
</ServerSideEncryptionConfiguration>

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in XML format by the service.

Examples Sample Request: Retrieve the encryption configuration for an S3 general purpose bucket

The following example shows a GET /?encryption request.


            GET /?encryption HTTP/1.1
            Host: amzn-s3-demo-bucket.s3.<Region>.amazonaws.com
            Date: Wed, 06 Sep 2017 12:00:00 GMT
            Authorization: authorization string
            Content-Length: length

Sample Response for a general purpose bucket

This example illustrates one usage of GetBucketEncryption.


           HTTP/1.1 200 OK
            x-amz-id-2: kDmqsuw5FDmgLmxQaUkd9A4NJ/PIiE0c1rAU/ue2Yp60toXs4I5k5fqlwZsA6fV+wJQCzRRwygQ=
            x-amz-request-id: 5D8706FCB2673B7D
            Date: Wed, 06 Sep 2017 12:00:00 GMT
            Transfer-Encoding: chunked
            Server: AmazonS3

            <ServerSideEncryptionConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
             <Rule>
               <ApplyServerSideEncryptionByDefault>
                   <SSEAlgorithm>aws:kms</SSEAlgorithm>
                   <KMSKeyID>arn:aws:kms:us-east-1:1234/5678example</KMSKeyID>
               </ApplyServerSideEncryptionByDefault>
            </Rule>
            </ServerSideEncryptionConfiguration>