From 05a351d344ec33f8ad91ab88736d035a08223a0d Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Fri, 2 Apr 2021 12:20:09 +0300
Subject: [PATCH] [#265] pkg/reputation: Change PeerID implementation

Make `PeerID` type to be the wrapper over v2 `PeerID` message structure.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 pkg/reputation/peer.go          | 92 ++++++++++++++++++++++++++++-----
 pkg/reputation/peer_test.go     | 46 ++++++++++++++---
 pkg/reputation/test/generate.go |  6 ++-
 3 files changed, 123 insertions(+), 21 deletions(-)

diff --git a/pkg/reputation/peer.go b/pkg/reputation/peer.go
index ef1a314..60d4ea3 100644
--- a/pkg/reputation/peer.go
+++ b/pkg/reputation/peer.go
@@ -1,29 +1,93 @@
 package reputation
 
+import (
+	"bytes"
+
+	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neofs-api-go/v2/reputation"
+	crypto "github.com/nspcc-dev/neofs-crypto"
+)
+
 // PeerID represents peer ID compatible with NeoFS API v2.
-type PeerID []byte
+type PeerID reputation.PeerID
 
 // NewPeerID creates and returns blank PeerID.
 func NewPeerID() *PeerID {
-	return PeerIDFromV2(nil)
+	return PeerIDFromV2(new(reputation.PeerID))
 }
 
-// PeerIDFromV2 converts bytes slice to PeerID.
-func PeerIDFromV2(data []byte) *PeerID {
-	return (*PeerID)(&data)
+// PeerIDFromV2 converts NeoFS API v2 reputation.PeerID message to PeerID.
+func PeerIDFromV2(id *reputation.PeerID) *PeerID {
+	return (*PeerID)(id)
 }
 
-// SetBytes sets bytes of peer ID.
-func (x *PeerID) SetBytes(v []byte) {
-	*x = v
+// SetPublicKey sets peer ID as a compressed public key.
+func (x *PeerID) SetPublicKey(v [crypto.PublicKeyCompressedSize]byte) {
+	(*reputation.PeerID)(x).
+		SetValue(v[:])
 }
 
-// Bytes returns bytes of peer ID.
-func (x PeerID) Bytes() []byte {
-	return x
+// ToV2 converts PeerID to NeoFS API v2 reputation.PeerID message.
+func (x *PeerID) ToV2() *reputation.PeerID {
+	return (*reputation.PeerID)(x)
 }
 
-// ToV2 converts PeerID to byte slice.
-func (x PeerID) ToV2() []byte {
-	return x
+// Equal returns true if identifiers are identical.
+func (x *PeerID) Equal(x2 *PeerID) bool {
+	return bytes.Equal(
+		(*reputation.PeerID)(x).GetValue(),
+		(*reputation.PeerID)(x2).GetValue(),
+	)
+}
+
+// Parse parses PeerID from base58 string.
+func (x *PeerID) Parse(s string) error {
+	data, err := base58.Decode(s)
+	if err != nil {
+		return err
+	}
+
+	(*reputation.PeerID)(x).SetValue(data)
+
+	return nil
+}
+
+// String returns base58 string representation of PeerID.
+func (x *PeerID) String() string {
+	return base58.Encode(
+		(*reputation.PeerID)(x).
+			GetValue(),
+	)
+}
+
+// Marshal marshals PeerID into a protobuf binary form.
+//
+// Buffer is allocated when the argument is empty.
+// Otherwise, the first buffer is used.
+func (x *PeerID) Marshal(b ...[]byte) ([]byte, error) {
+	var buf []byte
+	if len(b) > 0 {
+		buf = b[0]
+	}
+
+	return (*reputation.PeerID)(x).
+		StableMarshal(buf)
+}
+
+// Unmarshal unmarshals protobuf binary representation of PeerID.
+func (x *PeerID) Unmarshal(data []byte) error {
+	return (*reputation.PeerID)(x).
+		Unmarshal(data)
+}
+
+// MarshalJSON encodes PeerID to protobuf JSON format.
+func (x *PeerID) MarshalJSON() ([]byte, error) {
+	return (*reputation.PeerID)(x).
+		MarshalJSON()
+}
+
+// UnmarshalJSON decodes PeerID from protobuf JSON format.
+func (x *PeerID) UnmarshalJSON(data []byte) error {
+	return (*reputation.PeerID)(x).
+		UnmarshalJSON(data)
 }
diff --git a/pkg/reputation/peer_test.go b/pkg/reputation/peer_test.go
index 79c0da7..4a63546 100644
--- a/pkg/reputation/peer_test.go
+++ b/pkg/reputation/peer_test.go
@@ -4,15 +4,49 @@ import (
 	"testing"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/reputation"
+	reputationtest "github.com/nspcc-dev/neofs-api-go/pkg/reputation/test"
 	"github.com/stretchr/testify/require"
 )
 
-func TestPeerID(t *testing.T) {
-	peerID := reputation.NewPeerID()
-
-	data := []byte{1, 2, 3}
-	peerID.SetBytes(data)
-	require.Equal(t, data, peerID.Bytes())
+func TestPeerID_ToV2(t *testing.T) {
+	peerID := reputationtest.GeneratePeerID()
 
 	require.Equal(t, peerID, reputation.PeerIDFromV2(peerID.ToV2()))
 }
+
+func TestPeerID_String(t *testing.T) {
+	id := reputationtest.GeneratePeerID()
+
+	strID := id.String()
+
+	id2 := reputation.NewPeerID()
+
+	err := id2.Parse(strID)
+	require.NoError(t, err)
+
+	require.Equal(t, id, id2)
+}
+
+func TestPeerIDEncoding(t *testing.T) {
+	id := reputationtest.GeneratePeerID()
+
+	t.Run("binary", func(t *testing.T) {
+		data, err := id.Marshal()
+		require.NoError(t, err)
+
+		id2 := reputation.NewPeerID()
+		require.NoError(t, id2.Unmarshal(data))
+
+		require.Equal(t, id, id2)
+	})
+
+	t.Run("json", func(t *testing.T) {
+		data, err := id.MarshalJSON()
+		require.NoError(t, err)
+
+		id2 := reputation.NewPeerID()
+		require.NoError(t, id2.UnmarshalJSON(data))
+
+		require.Equal(t, id, id2)
+	})
+}
diff --git a/pkg/reputation/test/generate.go b/pkg/reputation/test/generate.go
index 7d02c8b..06676e9 100644
--- a/pkg/reputation/test/generate.go
+++ b/pkg/reputation/test/generate.go
@@ -8,7 +8,11 @@ import (
 
 func GeneratePeerID() *reputation.PeerID {
 	v := reputation.NewPeerID()
-	v.SetBytes(crypto.MarshalPublicKey(&test.DecodeKey(-1).PublicKey))
+
+	key := [crypto.PublicKeyCompressedSize]byte{}
+	copy(key[:], crypto.MarshalPublicKey(&test.DecodeKey(-1).PublicKey))
+
+	v.SetPublicKey(key)
 
 	return v
 }