[#7] Add put container event parser for morph

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

pkg/morph/event/container/put.go

@@ -0,0 +1,67 @@
+package container
+
+import (
+	"crypto/elliptic"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+	"github.com/pkg/errors"
+)
+
+// Put structure of container.Put notification from morph chain.
+type Put struct {
+	rawContainer []byte
+	signature    []byte
+	publicKey    *keys.PublicKey
+}
+
+// MorphEvent implements Neo:Morph Event interface.
+func (Put) MorphEvent() {}
+
+// Container is a marshalled container structure, defined in API.
+func (p Put) Container() []byte { return p.rawContainer }
+
+// Signature of marshalled container by container owner.
+func (p Put) Signature() []byte { return p.signature }
+
+// PublicKey of container owner.
+func (p Put) PublicKey() *keys.PublicKey { return p.publicKey }
+
+// ParsePut from notification into container event structure.
+func ParsePut(params []smartcontract.Parameter) (event.Event, error) {
+	var (
+		ev  Put
+		err error
+	)
+
+	if ln := len(params); ln != 3 {
+		return nil, event.WrongNumberOfParameters(3, ln)
+	}
+
+	// parse container
+	ev.rawContainer, err = client.BytesFromStackParameter(params[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get container")
+	}
+
+	// parse signature
+	ev.signature, err = client.BytesFromStackParameter(params[1])
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get signature")
+	}
+
+	// parse public key
+	key, err := client.BytesFromStackParameter(params[2])
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get public key")
+	}
+
+	ev.publicKey, err = keys.NewPublicKeyFromBytes(key, elliptic.P256())
+	if err != nil {
+		return nil, errors.Wrap(err, "could not parse public key")
+	}
+
+	return ev, nil
+}

pkg/morph/event/container/put_test.go

@@ -0,0 +1,100 @@
+package container
+
+import (
+	"crypto/elliptic"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	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 TestParsePut(t *testing.T) {
+	var (
+		containerData = []byte("containerData")
+		signature     = []byte("signature")
+		publicKey     = &test.DecodeKey(-1).PublicKey
+	)
+
+	t.Run("wrong number of parameters", func(t *testing.T) {
+		prms := []smartcontract.Parameter{
+			{},
+			{},
+		}
+
+		_, err := ParsePut(prms)
+		require.EqualError(t, err, event.WrongNumberOfParameters(3, len(prms)).Error())
+	})
+
+	t.Run("wrong container parameter", func(t *testing.T) {
+		_, err := ParsePut([]smartcontract.Parameter{
+			{
+				Type: smartcontract.ArrayType,
+			},
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("wrong signature parameter", func(t *testing.T) {
+		_, err := ParsePut([]smartcontract.Parameter{
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: containerData,
+			},
+			{
+				Type: smartcontract.ArrayType,
+			},
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("wrong key parameter", func(t *testing.T) {
+		_, err := ParsePut([]smartcontract.Parameter{
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: containerData,
+			},
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: signature,
+			},
+			{
+				Type: smartcontract.ArrayType,
+			},
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("correct behavior", func(t *testing.T) {
+		ev, err := ParsePut([]smartcontract.Parameter{
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: containerData,
+			},
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: signature,
+			},
+			{
+				Type:  smartcontract.ByteArrayType,
+				Value: crypto.MarshalPublicKey(publicKey),
+			},
+		})
+		require.NoError(t, err)
+
+		expectedKey, err := keys.NewPublicKeyFromBytes(crypto.MarshalPublicKey(publicKey), elliptic.P256())
+		require.NoError(t, err)
+
+		require.Equal(t, Put{
+			rawContainer: containerData,
+			signature:    signature,
+			publicKey:    expectedKey,
+		}, ev)
+	})
+}