object: Add method to detect non-attribute filter

Object filters may be attributed and non-attribute (for system needs).
The system filter can affect the logic of the application, so it should
be possible to check for its presence.

Add `HasNonAttributeFilter` method to `SearchFilters` that returns true
iff the instance contains non-attribute filter.

Refs #226.

Signed-off-by: Leonard Lyubich <leonard@morphbits.io>

object/search.go

@@ -5,6 +5,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"strconv"
+	"strings"
 
 	v2object "github.com/nspcc-dev/neofs-api-go/v2/object"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
@@ -316,3 +317,15 @@ func (f *SearchFilters) AddCreationEpochFilter(m SearchMatchType, epoch uint64)
 func (f *SearchFilters) AddPayloadSizeFilter(m SearchMatchType, size uint64) {
 	f.addFilter(m, FilterPayloadSize, staticStringer(strconv.FormatUint(size, 10)))
 }
+
+// HasNonAttributeFilter checks if SearchFilters instance contains a
+// non-attribute filter.
+func (f SearchFilters) HasNonAttributeFilter() bool {
+	for i := range f {
+		if strings.HasPrefix(f[i].header, v2object.ReservedFilterPrefix) {
+			return true
+		}
+	}
+
+	return false
+}

object/search_test.go

@@ -10,8 +10,13 @@ import (
 
 	v2object "github.com/nspcc-dev/neofs-api-go/v2/object"
 	"github.com/nspcc-dev/neofs-sdk-go/checksum"
+	cidtest "github.com/nspcc-dev/neofs-sdk-go/container/id/test"
 	"github.com/nspcc-dev/neofs-sdk-go/object"
 	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
+	oidtest "github.com/nspcc-dev/neofs-sdk-go/object/id/test"
+	objecttest "github.com/nspcc-dev/neofs-sdk-go/object/test"
+	usertest "github.com/nspcc-dev/neofs-sdk-go/user/test"
+	versiontest "github.com/nspcc-dev/neofs-sdk-go/version/test"
 	"github.com/nspcc-dev/tzhash/tz"
 	"github.com/stretchr/testify/require"
 )
@@ -398,3 +403,34 @@ func TestSearchFilters_AddPayloadSizeFilter(t *testing.T) {
 		require.Equal(t, v2object.MatchStringEqual, fsV2[0].GetMatchType())
 	})
 }
+
+func TestSearchFilters_HasNonAttributeFilter(t *testing.T) {
+	const anyMatcher = object.MatchStringEqual
+	fs := new(object.SearchFilters)
+
+	require.False(t, fs.HasNonAttributeFilter())
+
+	fs.AddFilter("key", "value", anyMatcher)
+	require.False(t, fs.HasNonAttributeFilter())
+
+	for _, f := range []func(){
+		func() { fs.AddFilter("$Object:any", "", anyMatcher) },
+		func() { fs.AddObjectVersionFilter(anyMatcher, versiontest.Version()) },
+		func() { fs.AddParentIDFilter(anyMatcher, oidtest.ID()) },
+		func() { fs.AddObjectContainerIDFilter(anyMatcher, cidtest.ID()) },
+		func() { fs.AddObjectOwnerIDFilter(anyMatcher, *usertest.ID(t)) },
+		func() { fs.AddCreationEpochFilter(anyMatcher, rand.Uint64()) },
+		func() { fs.AddPayloadSizeFilter(anyMatcher, rand.Uint64()) },
+		func() { fs.AddPayloadHashFilter(anyMatcher, [sha256.Size]byte{1}) },
+		func() { fs.AddTypeFilter(anyMatcher, object.TypeTombstone) },
+		func() { fs.AddHomomorphicHashFilter(anyMatcher, [tz.Size]byte{1}) },
+		func() { fs.AddParentIDFilter(anyMatcher, oidtest.ID()) },
+		func() { fs.AddSplitIDFilter(anyMatcher, *objecttest.SplitID()) },
+		func() { fs.AddRootFilter() },
+		func() { fs.AddPhyFilter() },
+	} {
+		*fs = (*fs)[:0]
+		f()
+		require.True(t, fs.HasNonAttributeFilter())
+	}
+}