S3 PresignHeadObject Support

[bdwyertech]

Wondering if we could get a client function added for creating a presigned HeadObject request for S3.

This is to fill a gap vs the v1 SDK which had the Presign function for all request types.

// PresignHeadObject is used to generate a presigned HTTP Request which contains
// presigned URL, signed headers and HTTP method used.
func (c *PresignClient) PresignHeadObject(ctx context.Context, params *HeadObjectInput, optFns ...func(*PresignOptions)) (*v4.PresignedHTTPRequest, error) {
	if params == nil {
		params = &HeadObjectInput{}
	}
	options := c.options.copy()
	for _, fn := range optFns {
		fn(&options)
	}
	clientOptFns := append(options.ClientOptions, withNopHTTPClientAPIOption)

	result, _, err := c.client.invokeOperation(ctx, "HeadObject", params, clientOptFns,
		c.client.addOperationHeadObjectMiddlewares,
		presignConverter(options).convertToPresignMiddleware,
		addHeadObjectPayloadAsUnsigned,
	)
	if err != nil {
		return nil, err
	}

	out := result.(*v4.PresignedHTTPRequest)
	return out, nil
}

func addHeadObjectPayloadAsUnsigned(stack *middleware.Stack, options Options) error {
	v4.RemoveContentSHA256HeaderMiddleware(stack)
	v4.RemoveComputePayloadSHA256Middleware(stack)
	return v4.AddUnsignedPayloadMiddleware(stack)
}

[KaibaLopez]

@bdwyertech ,
Thanks for bringing this up. We'll look into adding into an upcoming release.

[github-actions]

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