[#182] sdk/eacl: Implement convenient methods for adding object filters

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

pkg/acl/eacl/filter.go

@@ -1,6 +1,8 @@
 package eacl
 
 import (
+	"fmt"
+
 	v2acl "github.com/nspcc-dev/neofs-api-go/v2/acl"
 )
 
@@ -8,13 +10,40 @@ import (
 // header means that request should be processed according to EACL action.
 type Filter struct {
 	from    FilterHeaderType
-	key     string
+	key     filterKey
 	matcher Match
-	value   string
+	value   fmt.Stringer
+}
+
+type staticStringer string
+
+type filterKey struct {
+	typ filterKeyType
+
+	str string
+}
+
+// enumeration of reserved filter keys.
+type filterKeyType int
+
+const (
+	_ filterKeyType = iota
+	fKeyObjVersion
+	fKeyObjContainerID
+	fKeyObjOwnerID
+	fKeyObjCreationEpoch
+	fKeyObjPayloadLength
+	fKeyObjPayloadHash
+	fKeyObjType
+	fKeyObjHomomorphicHash
+)
+
+func (s staticStringer) String() string {
+	return string(s)
 }
 
 func (a Filter) Value() string {
-	return a.value
+	return a.value.String()
 }
 
 func (a Filter) Matcher() Match {
@@ -22,7 +51,7 @@ func (a Filter) Matcher() Match {
 }
 
 func (a Filter) Key() string {
-	return a.key
+	return a.key.String()
 }
 
 func (a Filter) From() FilterHeaderType {
@@ -31,14 +60,37 @@ func (a Filter) From() FilterHeaderType {
 
 func (a *Filter) ToV2() *v2acl.HeaderFilter {
 	filter := new(v2acl.HeaderFilter)
-	filter.SetValue(a.value)
-	filter.SetKey(a.key)
+	filter.SetValue(a.value.String())
+	filter.SetKey(a.key.String())
 	filter.SetMatchType(a.matcher.ToV2())
 	filter.SetHeaderType(a.from.ToV2())
 
 	return filter
 }
 
+func (k filterKey) String() string {
+	switch k.typ {
+	default:
+		return k.str
+	case fKeyObjVersion:
+		return v2acl.FilterObjectVersion
+	case fKeyObjContainerID:
+		return v2acl.FilterObjectContainerID
+	case fKeyObjOwnerID:
+		return v2acl.FilterObjectOwnerID
+	case fKeyObjCreationEpoch:
+		return v2acl.FilterObjectCreationEpoch
+	case fKeyObjPayloadLength:
+		return v2acl.FilterObjectPayloadLength
+	case fKeyObjPayloadHash:
+		return v2acl.FilterObjectPayloadHash
+	case fKeyObjType:
+		return v2acl.FilterObjectType
+	case fKeyObjHomomorphicHash:
+		return v2acl.FilterObjectHomomorphicHash
+	}
+}
+
 func NewFilterFromV2(filter *v2acl.HeaderFilter) *Filter {
 	f := new(Filter)
 
@@ -48,8 +100,8 @@ func NewFilterFromV2(filter *v2acl.HeaderFilter) *Filter {
 
 	f.from = FilterHeaderTypeFromV2(filter.GetHeaderType())
 	f.matcher = MatchFromV2(filter.GetMatchType())
-	f.key = filter.GetKey()
-	f.value = filter.GetValue()
+	f.key.str = filter.GetKey()
+	f.value = staticStringer(filter.GetValue())
 
 	return f
 }

pkg/acl/eacl/filter_test.go

@@ -7,13 +7,19 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestFilter(t *testing.T) {
-	filter := &Filter{
-		from:    HeaderFromObject,
-		key:     "some name",
-		matcher: MatchStringEqual,
-		value:   "200",
+func newObjectFilter(match Match, key, val string) *Filter {
+	return &Filter{
+		from: HeaderFromObject,
+		key: filterKey{
+			str: key,
+		},
+		matcher: match,
+		value:   staticStringer(val),
 	}
+}
+
+func TestFilter(t *testing.T) {
+	filter := newObjectFilter(MatchStringEqual, "some name", "200")
 
 	v2 := filter.ToV2()
 	require.NotNil(t, v2)

pkg/acl/eacl/record.go

@@ -2,7 +2,11 @@ package eacl
 
 import (
 	"crypto/ecdsa"
+	"fmt"
 
+	"github.com/nspcc-dev/neofs-api-go/pkg"
+	"github.com/nspcc-dev/neofs-api-go/pkg/container"
+	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
 	v2acl "github.com/nspcc-dev/neofs-api-go/v2/acl"
 )
 
@@ -54,17 +58,50 @@ func (r *Record) AddTarget(role Role, keys ...ecdsa.PublicKey) {
 	r.targets = append(r.targets, t)
 }
 
-func (r *Record) AddFilter(from FilterHeaderType, matcher Match, name, value string) {
+func (r *Record) addFilter(from FilterHeaderType, m Match, keyTyp filterKeyType, key string, val fmt.Stringer) {
 	filter := Filter{
-		from:    from,
-		key:     name,
-		matcher: matcher,
-		value:   value,
+		from: from,
+		key: filterKey{
+			typ: keyTyp,
+			str: key,
+		},
+		matcher: m,
+		value:   val,
 	}
 
 	r.filters = append(r.filters, filter)
 }
 
+func (r *Record) addObjectFilter(m Match, keyTyp filterKeyType, key string, val fmt.Stringer) {
+	r.addFilter(HeaderFromObject, m, keyTyp, key, val)
+}
+
+func (r *Record) addObjectReservedFilter(m Match, typ filterKeyType, val fmt.Stringer) {
+	r.addObjectFilter(m, typ, "", val)
+}
+
+func (r *Record) AddFilter(from FilterHeaderType, matcher Match, name, value string) {
+	r.addFilter(from, matcher, 0, name, staticStringer(value))
+}
+
+func (r *Record) AddObjectAttributeFilter(m Match, key, value string) {
+	r.addObjectFilter(m, 0, key, staticStringer(value))
+}
+
+func (r *Record) AddObjectVersionFilter(m Match, v *pkg.Version) {
+	r.addObjectReservedFilter(m, fKeyObjVersion, v)
+}
+
+func (r *Record) AddObjectContainerIDFilter(m Match, id *container.ID) {
+	r.addObjectReservedFilter(m, fKeyObjContainerID, id)
+}
+
+func (r *Record) AddObjectOwnerIDFilter(m Match, id *owner.ID) {
+	r.addObjectReservedFilter(m, fKeyObjOwnerID, id)
+}
+
+// TODO: add remaining filters after neofs-api#72
+
 func (r *Record) ToV2() *v2acl.Record {
 	targets := make([]*v2acl.Target, 0, len(r.targets))
 	for _, target := range r.targets {

pkg/acl/eacl/record_test.go

@@ -60,18 +60,8 @@ func TestRecord_AddTarget(t *testing.T) {
 
 func TestRecord_AddFilter(t *testing.T) {
 	filters := []Filter{
-		{
-			from:    HeaderFromObject,
-			key:     "some name",
-			matcher: MatchStringEqual,
-			value:   "ContainerID",
-		},
-		{
-			from:    HeaderFromRequest,
-			key:     "X-Header-Name",
-			matcher: MatchStringNotEqual,
-			value:   "X-Header-Value",
-		},
+		*newObjectFilter(MatchStringEqual, "some name", "ContainerID"),
+		*newObjectFilter(MatchStringNotEqual, "X-Header-Name", "X-Header-Value"),
 	}
 
 	r := NewRecord()