From 66eafcd558f6ab53b12a1b85012b18bddc4e82b8 Mon Sep 17 00:00:00 2001
From: Alex Vanin <alexey@nspcc.ru>
Date: Tue, 8 Sep 2020 11:37:58 +0300
Subject: [PATCH] [#21] Add neofs bind event

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
---
 pkg/morph/event/neofs/bind.go      | 69 +++++++++++++++++++++
 pkg/morph/event/neofs/bind_test.go | 97 ++++++++++++++++++++++++++++++
 2 files changed, 166 insertions(+)
 create mode 100644 pkg/morph/event/neofs/bind.go
 create mode 100644 pkg/morph/event/neofs/bind_test.go

diff --git a/pkg/morph/event/neofs/bind.go b/pkg/morph/event/neofs/bind.go
new file mode 100644
index 00000000..27574b61
--- /dev/null
+++ b/pkg/morph/event/neofs/bind.go
@@ -0,0 +1,69 @@
+package neofs
+
+import (
+	"crypto/elliptic"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+	"github.com/pkg/errors"
+)
+
+type Bind struct {
+	user util.Uint160
+	keys []*keys.PublicKey
+}
+
+// MorphEvent implements Neo:Morph Event interface.
+func (Bind) MorphEvent() {}
+
+func (b Bind) Keys() []*keys.PublicKey { return b.keys }
+
+func (b Bind) User() util.Uint160 { return b.user }
+
+func ParseBind(params []smartcontract.Parameter) (event.Event, error) {
+	var (
+		ev  Bind
+		err error
+	)
+
+	if ln := len(params); ln != 2 {
+		return nil, event.WrongNumberOfParameters(2, ln)
+	}
+
+	// parse user
+	user, err := client.BytesFromStackParameter(params[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get bind user")
+	}
+
+	ev.user, err = util.Uint160DecodeBytesBE(user)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not convert bind user to uint160")
+	}
+
+	// parse keys
+	bindKeys, err := client.ArrayFromStackParameter(params[1])
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get bind keys")
+	}
+
+	ev.keys = make([]*keys.PublicKey, 0, len(bindKeys))
+	for i := range bindKeys {
+		rawKey, err := client.BytesFromStackParameter(bindKeys[i])
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get bind public key")
+		}
+
+		key, err := keys.NewPublicKeyFromBytes(rawKey, elliptic.P256())
+		if err != nil {
+			return nil, errors.Wrap(err, "could not parse bind public key")
+		}
+
+		ev.keys = append(ev.keys, key)
+	}
+
+	return ev, nil
+}
diff --git a/pkg/morph/event/neofs/bind_test.go b/pkg/morph/event/neofs/bind_test.go
new file mode 100644
index 00000000..6761b2ee
--- /dev/null
+++ b/pkg/morph/event/neofs/bind_test.go
@@ -0,0 +1,97 @@
+package neofs
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	crypto "github.com/nspcc-dev/neofs-crypto"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+	"github.com/nspcc-dev/neofs-node/pkg/util/test"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseBind(t *testing.T) {
+	var (
+		user       = util.Uint160{0x1, 0x2, 0x3}
+		publicKeys = []*ecdsa.PublicKey{
+			&test.DecodeKey(1).PublicKey,
+			&test.DecodeKey(2).PublicKey,
+			&test.DecodeKey(3).PublicKey,
+		}
+	)
+
+	t.Run("wrong number of parameters", func(t *testing.T) {
+		prms := []smartcontract.Parameter{
+			{},
+		}
+
+		_, err := ParseBind(prms)
+		require.EqualError(t, err, event.WrongNumberOfParameters(2, len(prms)).Error())
+	})
+
+	t.Run("wrong first parameter", func(t *testing.T) {
+		_, err := ParseBind([]smartcontract.Parameter{
+			{
+				Type: smartcontract.ArrayType,
+			},
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("wrong second parameter", func(t *testing.T) {
+		_, err := ParseBind([]smartcontract.Parameter{
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: user.BytesBE(),
+			},
+			{
+				Type: smartcontract.ArrayType,
+			},
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("correct", func(t *testing.T) {
+		ev, err := ParseBind([]smartcontract.Parameter{
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: user.BytesBE(),
+			},
+			{
+				Type: smartcontract.ArrayType,
+				Value: []smartcontract.Parameter{
+					{
+						Type:  smartcontract.ByteArrayType,
+						Value: crypto.MarshalPublicKey(publicKeys[0]),
+					},
+					{
+						Type:  smartcontract.ByteArrayType,
+						Value: crypto.MarshalPublicKey(publicKeys[1]),
+					},
+					{
+						Type:  smartcontract.ByteArrayType,
+						Value: crypto.MarshalPublicKey(publicKeys[2]),
+					},
+				},
+			},
+		})
+		require.NoError(t, err)
+
+		expKeys := make([]*keys.PublicKey, len(publicKeys))
+		for i := range publicKeys {
+			expKeys[i], err = keys.NewPublicKeyFromBytes(crypto.MarshalPublicKey(publicKeys[i]), elliptic.P256())
+			require.NoError(t, err)
+		}
+
+		require.Equal(t, Bind{
+			user: user,
+			keys: expKeys,
+		}, ev)
+	})
+}