[#254] object: Support new values of search match type

Support STRING_NOT_EQUAL and NOT_PRESENT match types
of object search filters.

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

pkg/object/search.go

@@ -15,12 +15,18 @@ type SearchMatchType uint32
 const (
 	MatchUnknown SearchMatchType = iota
 	MatchStringEqual
+	MatchStringNotEqual
+	MatchNotPresent
 )
 
 func (m SearchMatchType) ToV2() v2object.MatchType {
 	switch m {
 	case MatchStringEqual:
 		return v2object.MatchStringEqual
+	case MatchStringNotEqual:
+		return v2object.MatchStringNotEqual
+	case MatchNotPresent:
+		return v2object.MatchNotPresent
 	default:
 		return v2object.MatchUnknown
 	}
@@ -30,6 +36,10 @@ func SearchMatchFromV2(t v2object.MatchType) (m SearchMatchType) {
 	switch t {
 	case v2object.MatchStringEqual:
 		m = MatchStringEqual
+	case v2object.MatchStringNotEqual:
+		m = MatchStringNotEqual
+	case v2object.MatchNotPresent:
+		m = MatchNotPresent
 	default:
 		m = MatchUnknown
 	}

pkg/object/search_test.go

@@ -14,6 +14,8 @@ var (
 	eqV2Matches = map[object.SearchMatchType]v2object.MatchType{
 		object.MatchUnknown:        v2object.MatchUnknown,
 		object.MatchStringEqual:    v2object.MatchStringEqual,
+		object.MatchStringNotEqual: v2object.MatchStringNotEqual,
+		object.MatchNotPresent:     v2object.MatchNotPresent,
 	}
 )
 

v2/object/grpc/service.pb.go

@@ -1952,6 +1952,10 @@ func (x *SearchRequest_Body) GetFilters() []*SearchRequest_Body_Filter {
 // * $Object:PHY \
 //   Returns only objects physically stored in the system. This filter is
 //   activated if the `key` exists, disregarding the value and matcher type.
+//
+// Note: using filters with a key with prefix `$Object:` and match type
+// `NOT_PRESENT `is not recommended since this is not a cross-version approach.
+// Behavior when processing this kind of filters is undefined.
 type SearchRequest_Body_Filter struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache

v2/object/grpc/types.pb.go

@@ -96,6 +96,10 @@ const (
 	MatchType_MATCH_TYPE_UNSPECIFIED MatchType = 0
 	// Full string match
 	MatchType_STRING_EQUAL MatchType = 1
+	// Full string mismatch
+	MatchType_STRING_NOT_EQUAL MatchType = 2
+	// Lack of key
+	MatchType_NOT_PRESENT MatchType = 3
 )
 
 // Enum value maps for MatchType.
@@ -103,10 +107,14 @@ var (
 	MatchType_name = map[int32]string{
 		0: "MATCH_TYPE_UNSPECIFIED",
 		1: "STRING_EQUAL",
+		2: "STRING_NOT_EQUAL",
+		3: "NOT_PRESENT",
 	}
 	MatchType_value = map[string]int32{
 		"MATCH_TYPE_UNSPECIFIED": 0,
 		"STRING_EQUAL":           1,
+		"STRING_NOT_EQUAL":       2,
+		"NOT_PRESENT":            3,
 	}
 )
 
@@ -839,16 +847,19 @@ var file_v2_object_grpc_types_proto_rawDesc = []byte{
 	0x0a, 0x0a, 0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x54, 0x79, 0x70, 0x65, 0x12, 0x0b, 0x0a, 0x07,
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+	0x41, 0x47, 0x45, 0x5f, 0x47, 0x52, 0x4f, 0x55, 0x50, 0x10, 0x02, 0x2a, 0x60, 0x0a, 0x09, 0x4d,
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+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

v2/object/types.go

@@ -226,6 +226,8 @@ const (
 const (
 	MatchUnknown MatchType = iota
 	MatchStringEqual
+	MatchStringNotEqual
+	MatchNotPresent
 )
 
 func (h *ShortHeader) GetVersion() *refs.Version {