All Known Implementing Classes:

AwsChunkedV4aPayloadSigner, DefaultV4aPayloadSigner
```
@SdkInternalApi
public interface V4aPayloadSigner
```
An interface for defining how to sign a payload via SigV4a.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default void`	`beforeSigning(SdkHttpRequest.Builder request, ContentStreamProvider payload, String checksum)`	Modify a request before it is signed, such as changing headers or query-parameters.
`default CompletableFuture<Pair<SdkHttpRequest.Builder,Optional<org.reactivestreams.Publisher<ByteBuffer>>>>`	`beforeSigningAsync(SdkHttpRequest.Builder request, org.reactivestreams.Publisher<ByteBuffer> payload, String checksum)`
`static V4aPayloadSigner`	`create()`	Get a default implementation of a SigV4a payload signer.
`ContentStreamProvider`	`sign(ContentStreamProvider payload, V4aRequestSigningResult requestSigningResult)`	Given a payload and result of request signing, sign the payload via the SigV4a process.
`org.reactivestreams.Publisher<ByteBuffer>`	`signAsync(org.reactivestreams.Publisher<ByteBuffer> payload, V4aRequestSigningResult requestSigningResult)`	Given a payload and result of request signing, sign the payload via the SigV4 process.

Method Detail

create
```
static V4aPayloadSigner create()
```
Get a default implementation of a SigV4a payload signer.

sign

ContentStreamProvider sign(ContentStreamProvider payload,
                           V4aRequestSigningResult requestSigningResult)

Given a payload and result of request signing, sign the payload via the SigV4a process.

signAsync

org.reactivestreams.Publisher<ByteBuffer> signAsync(org.reactivestreams.Publisher<ByteBuffer> payload,
                                                    V4aRequestSigningResult requestSigningResult)

Given a payload and result of request signing, sign the payload via the SigV4 process.

beforeSigning

default void beforeSigning(SdkHttpRequest.Builder request,
                           ContentStreamProvider payload,
                           String checksum)

Modify a request before it is signed, such as changing headers or query-parameters.

beforeSigningAsync

default CompletableFuture<Pair<SdkHttpRequest.Builder,Optional<org.reactivestreams.Publisher<ByteBuffer>>>> beforeSigningAsync(SdkHttpRequest.Builder request,
                                                                                                                                     org.reactivestreams.Publisher<ByteBuffer> payload,
                                                                                                                                     String checksum)