[#133] sdk: Use cid wrapper to sign container delete request

StableMarshalerWrapper is not suitable for container delete
request, because it signs marshaled structure of container id.
As for delete request, container id itself should be signed.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/client/container.go

@@ -13,6 +13,18 @@ import (
 	"github.com/pkg/errors"
 )
 
+type delContainerSignWrapper struct {
+	body *v2container.DeleteRequestBody
+}
+
+func (c delContainerSignWrapper) ReadSignedData(bytes []byte) ([]byte, error) {
+	return c.body.GetContainerID().GetValue(), nil
+}
+
+func (c delContainerSignWrapper) SignedDataSize() int {
+	return len(c.body.GetContainerID().GetValue())
+}
+
 func (c Client) PutContainer(ctx context.Context, cnr *container.Container, opts ...CallOption) (*container.ID, error) {
 	switch c.remoteNode.Version.Major {
 	case 2:
@@ -55,7 +67,7 @@ func (c Client) ListSelfContainers(ctx context.Context, opts ...CallOption) ([]*
 func (c Client) DeleteContainer(ctx context.Context, id *container.ID, opts ...CallOption) error {
 	switch c.remoteNode.Version.Major {
 	case 2:
-		panic("not implemented")
+		return c.delContainerV2(ctx, id, opts...)
 	default:
 		return unsupportedProtocolErr
 	}
@@ -248,13 +260,17 @@ func (c Client) delContainerV2(ctx context.Context, id *container.ID, opts ...Ca
 	reqBody.SetContainerID(id.ToV2())
 
 	// sign container
-	signWrapper := v2signature.StableMarshalerWrapper{SM: reqBody.GetContainerID()}
-	err := signature.SignDataWithHandler(c.key, signWrapper, func(key []byte, sig []byte) {
+	err := signature.SignDataWithHandler(c.key,
+		delContainerSignWrapper{
+			body: reqBody,
+		},
+		func(key []byte, sig []byte) {
 			containerSignature := new(refs.Signature)
 			containerSignature.SetKey(key)
 			containerSignature.SetSign(sig)
 			reqBody.SetSignature(containerSignature)
-	}, signature.SignWithRFC6979())
+		},
+		signature.SignWithRFC6979())
 	if err != nil {
 		return err
 	}