[#147] Work around owner package

- implement Stringer interface and Parse method for owner.ID
- increase test coverage

closes #147

Signed-off-by: Evgeniy Kulikov <kim@nspcc.ru>

pkg/owner/id.go

@@ -3,12 +3,18 @@ package owner
 import (
 	"github.com/mr-tron/base58"
 	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
+	"github.com/nspcc-dev/neofs-api-go/internal"
 	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+	"github.com/pkg/errors"
 )
 
 // ID represents v2-compatible owner identifier.
 type ID refs.OwnerID
 
+// ErrBadID should be returned when bytes slice isn't Owner.ID size (NEO3WalletSize).
+// Notice: if byte slice changed, please, replace error message.
+const ErrBadID = internal.Error("owner.ID should be 25 bytes length")
+
 // NewIDFromV2 wraps v2 OwnerID message to ID.
 func NewIDFromV2(idV2 *refs.OwnerID) *ID {
 	return (*ID)(idV2)
@@ -51,3 +57,17 @@ func NewIDFromNeo3Wallet(v *NEO3Wallet) *ID {
 
 	return id
 }
+
+// Parse converts base58 string representation into ID.
+func (id *ID) Parse(s string) error {
+	data, err := base58.Decode(s)
+	if err != nil {
+		return errors.Wrap(err, "could not parse owner.ID from string")
+	} else if len(data) != NEO3WalletSize {
+		return ErrBadID
+	}
+
+	(*refs.OwnerID)(id).SetValue(data)
+
+	return nil
+}

pkg/owner/id_test.go

@@ -2,8 +2,10 @@ package owner
 
 import (
 	"crypto/rand"
+	"strconv"
 	"testing"
 
+	"github.com/mr-tron/base58"
 	"github.com/nspcc-dev/neofs-crypto/test"
 	"github.com/stretchr/testify/require"
 )
@@ -30,3 +32,34 @@ func TestNewIDFromNeo3Wallet(t *testing.T) {
 	id := NewIDFromNeo3Wallet(wallet)
 	require.Equal(t, id.ToV2().GetValue(), wallet.Bytes())
 }
+
+func TestID_Parse(t *testing.T) {
+	t.Run("should parse successful", func(t *testing.T) {
+		for i := 0; i < 10; i++ {
+			j := i
+			t.Run(strconv.Itoa(j), func(t *testing.T) {
+				wallet, err := NEO3WalletFromPublicKey(&test.DecodeKey(j).PublicKey)
+				require.NoError(t, err)
+
+				eid := NewIDFromNeo3Wallet(wallet)
+				aid := NewID()
+
+				require.NoError(t, aid.Parse(eid.String()))
+				require.Equal(t, eid, aid)
+			})
+		}
+	})
+
+	t.Run("should failure on parse", func(t *testing.T) {
+		for i := 0; i < 10; i++ {
+			j := i
+			t.Run(strconv.Itoa(j), func(t *testing.T) {
+				cs := []byte{1, 2, 3, 4, 5, byte(j)}
+				str := base58.Encode(cs)
+				cid := NewID()
+
+				require.EqualError(t, cid.Parse(str), ErrBadID.Error())
+			})
+		}
+	})
+}