[#168] acl: Implement binary/JSON encoders/decoders on BearerToken

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/token/bearer.go

@@ -118,3 +118,47 @@ func sanityCheck(b *BearerToken) error {
 
 	return nil
 }
+
+// Marshal marshals BearerToken into a protobuf binary form.
+//
+// Buffer is allocated when the argument is empty.
+// Otherwise, the first buffer is used.
+func (b *BearerToken) Marshal(bs ...[]byte) ([]byte, error) {
+	var buf []byte
+	if len(bs) > 0 {
+		buf = bs[0]
+	}
+
+	return b.ToV2().
+		StableMarshal(buf)
+}
+
+// Unmarshal unmarshals protobuf binary representation of BearerToken.
+func (b *BearerToken) Unmarshal(data []byte) error {
+	fV2 := new(acl.BearerToken)
+	if err := fV2.Unmarshal(data); err != nil {
+		return err
+	}
+
+	*b = *NewBearerTokenFromV2(fV2)
+
+	return nil
+}
+
+// MarshalJSON encodes BearerToken to protobuf JSON format.
+func (b *BearerToken) MarshalJSON() ([]byte, error) {
+	return b.ToV2().
+		MarshalJSON()
+}
+
+// UnmarshalJSON decodes BearerToken from protobuf JSON format.
+func (b *BearerToken) UnmarshalJSON(data []byte) error {
+	fV2 := new(acl.BearerToken)
+	if err := fV2.UnmarshalJSON(data); err != nil {
+		return err
+	}
+
+	*b = *NewBearerTokenFromV2(fV2)
+
+	return nil
+}

pkg/token/bearer_test.go

@@ -30,3 +30,28 @@ func TestBearerToken_Issuer(t *testing.T) {
 		require.Equal(t, bearerToken.Issuer().String(), ownerID.String())
 	})
 }
+
+func TestFilterEncoding(t *testing.T) {
+	f := token.NewBearerToken()
+	f.SetLifetime(1, 2, 3)
+
+	t.Run("binary", func(t *testing.T) {
+		data, err := f.Marshal()
+		require.NoError(t, err)
+
+		f2 := token.NewBearerToken()
+		require.NoError(t, f2.Unmarshal(data))
+
+		require.Equal(t, f, f2)
+	})
+
+	t.Run("json", func(t *testing.T) {
+		data, err := f.MarshalJSON()
+		require.NoError(t, err)
+
+		d2 := token.NewBearerToken()
+		require.NoError(t, d2.UnmarshalJSON(data))
+
+		require.Equal(t, f, d2)
+	})
+}