[#660] core: Implement function to check protocol version adequacy

Create `version` package and implement `IsValid` function which checks if
version is not earlier than the genesis one.

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

pkg/core/version/version.go

@@ -0,0 +1,17 @@
+package version
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/pkg"
+)
+
+// IsValid checks if Version is not earlier than the genesis version of the NeoFS.
+func IsValid(v pkg.Version) bool {
+	const (
+		startMajor = 2
+		startMinor = 7
+	)
+
+	mjr := v.Major()
+
+	return mjr > startMajor || mjr == startMajor && v.Minor() >= startMinor
+}

pkg/core/version/version_test.go

@@ -0,0 +1,30 @@
+package version_test
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg"
+	"github.com/nspcc-dev/neofs-node/pkg/core/version"
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsValid(t *testing.T) {
+	require.True(t, version.IsValid(*pkg.SDKVersion()))
+
+	var v pkg.Version
+
+	for _, item := range []struct {
+		mjr, mnr uint32
+		valid    bool
+	}{
+		{mjr: 0, mnr: 0, valid: false},
+		{mjr: 2, mnr: 6, valid: false},
+		{mjr: 2, mnr: 7, valid: true},
+		{mjr: 3, mnr: 0, valid: true},
+	} {
+		v.SetMajor(item.mjr)
+		v.SetMinor(item.mnr)
+
+		require.Equal(t, item.valid, version.IsValid(v), item)
+	}
+}