[#265] innerring: Select containers to audit

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

pkg/innerring/invoke/container.go

@@ -1,9 +1,13 @@
 package invoke
 
 import (
+	"crypto/sha256"
+
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neofs-api-go/pkg/container"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
+	"github.com/pkg/errors"
 )
 
 type (
@@ -21,9 +25,12 @@ type (
 	}
 )
 
+var ErrParseTestInvoke = errors.New("can't parse NEO node response")
+
 const (
 	putContainerMethod    = "put"
 	deleteContainerMethod = "delete"
+	listContainersMethod  = "list"
 )
 
 // RegisterContainer invokes Put method.
@@ -50,3 +57,47 @@ func RemoveContainer(cli *client.Client, con util.Uint160, p *RemoveContainerPar
 		p.Signature,
 	)
 }
+
+func ListContainers(cli *client.Client, con util.Uint160) ([]*container.ID, error) {
+	if cli == nil {
+		return nil, client.ErrNilClient
+	}
+
+	item, err := cli.TestInvoke(con, listContainersMethod, []byte{})
+	if err != nil {
+		return nil, err
+	}
+
+	if len(item) < 1 {
+		return nil, errors.Wrap(ErrParseTestInvoke, "nested array expected")
+	}
+
+	rawIDs, err := client.ArrayFromStackItem(item[0])
+	if err != nil {
+		return nil, err
+	}
+
+	result := make([]*container.ID, 0, len(rawIDs))
+
+	var bufHash [sha256.Size]byte
+
+	for i := range rawIDs {
+		cid, err := client.BytesFromStackItem(rawIDs[i])
+		if err != nil {
+			return nil, err
+		}
+
+		if len(cid) != sha256.Size {
+			return nil, errors.Wrap(ErrParseTestInvoke, "invalid container ID size")
+		}
+
+		copy(bufHash[:], cid)
+
+		containerID := container.NewID()
+		containerID.SetSHA256(bufHash)
+
+		result = append(result, containerID)
+	}
+
+	return result, nil
+}