[#505] morph/events: Define eACL table change notification

Define `SetEACL` structure of eACL table change notification from Container
contract. Implement function which parses `SetEACL` event structure from
stack item list.

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

pkg/morph/event/container/eacl.go

@@ -0,0 +1,70 @@
+package container
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+)
+
+// SetEACL represents structure of notification about
+// modified eACL table coming from NeoFS Container contract.
+type SetEACL struct {
+	table []byte
+
+	signature []byte
+
+	publicKey []byte
+}
+
+// MorphEvent implements Neo:Morph Event interface.
+func (SetEACL) MorphEvent() {}
+
+// Table returns returns eACL table in a binary NeoFS API format.
+func (x SetEACL) Table() []byte {
+	return x.table
+}
+
+// Signature returns signature of the binary table.
+func (x SetEACL) Signature() []byte {
+	return x.signature
+}
+
+// PublicKey returns public keys of container
+// owner in a binary format.
+func (x SetEACL) PublicKey() []byte {
+	return x.publicKey
+}
+
+// ParseSetEACL parses SetEACL notification event from list of stack items.
+func ParseSetEACL(items []stackitem.Item) (event.Event, error) {
+	var (
+		ev  SetEACL
+		err error
+	)
+
+	if ln := len(items); ln != 3 {
+		return nil, event.WrongNumberOfParameters(3, ln)
+	}
+
+	// parse table
+	ev.table, err = client.BytesFromStackItem(items[0])
+	if err != nil {
+		return nil, fmt.Errorf("could not parse binary table: %w", err)
+	}
+
+	// parse signature
+	ev.signature, err = client.BytesFromStackItem(items[1])
+	if err != nil {
+		return nil, fmt.Errorf("could not parse table signature: %w", err)
+	}
+
+	// parse public key
+	ev.publicKey, err = client.BytesFromStackItem(items[2])
+	if err != nil {
+		return nil, fmt.Errorf("could not parse binary public key: %w", err)
+	}
+
+	return ev, nil
+}

pkg/morph/event/container/eacl_test.go

@@ -0,0 +1,72 @@
+package container_test
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event"
+	"github.com/nspcc-dev/neofs-node/pkg/morph/event/container"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseEACL(t *testing.T) {
+	var (
+		binaryTable = []byte("table")
+		signature   = []byte("signature")
+		publicKey   = []byte("pubkey")
+	)
+
+	t.Run("wrong number of parameters", func(t *testing.T) {
+		items := []stackitem.Item{
+			stackitem.NewMap(),
+			stackitem.NewMap(),
+		}
+
+		_, err := container.ParseSetEACL(items)
+		require.EqualError(t, err, event.WrongNumberOfParameters(3, len(items)).Error())
+	})
+
+	t.Run("wrong container parameter", func(t *testing.T) {
+		_, err := container.ParseSetEACL([]stackitem.Item{
+			stackitem.NewMap(),
+			stackitem.NewMap(),
+			stackitem.NewMap(),
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("wrong signature parameter", func(t *testing.T) {
+		_, err := container.ParseSetEACL([]stackitem.Item{
+			stackitem.NewByteArray(binaryTable),
+			stackitem.NewMap(),
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("wrong key parameter", func(t *testing.T) {
+		_, err := container.ParseSetEACL([]stackitem.Item{
+			stackitem.NewByteArray(binaryTable),
+			stackitem.NewByteArray(signature),
+			stackitem.NewMap(),
+		})
+
+		require.Error(t, err)
+	})
+
+	t.Run("correct behavior", func(t *testing.T) {
+		ev, err := container.ParseSetEACL([]stackitem.Item{
+			stackitem.NewByteArray(binaryTable),
+			stackitem.NewByteArray(signature),
+			stackitem.NewByteArray(publicKey),
+		})
+		require.NoError(t, err)
+
+		e := ev.(container.SetEACL)
+
+		require.Equal(t, binaryTable, e.Table())
+		require.Equal(t, signature, e.Signature())
+		require.Equal(t, publicKey, e.PublicKey())
+	})
+}