From 517d7a1e4a0f152204c9207944fd960ea3db94c4 Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Wed, 8 Jun 2022 12:16:30 +0300
Subject: [PATCH] [#266] eacl: Allow lossless conversion of reserved filters

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
---
 eacl/filter.go      | 28 +++++++++++++++++++++++++++-
 eacl/filter_test.go | 14 ++++++++++++++
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/eacl/filter.go b/eacl/filter.go
index 1885443..0a32ba5 100644
--- a/eacl/filter.go
+++ b/eacl/filter.go
@@ -41,6 +41,7 @@ const (
 	fKeyObjPayloadHash
 	fKeyObjType
 	fKeyObjHomomorphicHash
+	fKeyObjLast // helper, used in tests
 )
 
 func (s staticStringer) EncodeToString() string {
@@ -113,6 +114,31 @@ func (k filterKey) String() string {
 	}
 }
 
+func (k *filterKey) fromString(s string) {
+	switch s {
+	default:
+		k.typ, k.str = 0, s
+	case v2acl.FilterObjectVersion:
+		k.typ, k.str = fKeyObjVersion, ""
+	case v2acl.FilterObjectID:
+		k.typ, k.str = fKeyObjID, ""
+	case v2acl.FilterObjectContainerID:
+		k.typ, k.str = fKeyObjContainerID, ""
+	case v2acl.FilterObjectOwnerID:
+		k.typ, k.str = fKeyObjOwnerID, ""
+	case v2acl.FilterObjectCreationEpoch:
+		k.typ, k.str = fKeyObjCreationEpoch, ""
+	case v2acl.FilterObjectPayloadLength:
+		k.typ, k.str = fKeyObjPayloadLength, ""
+	case v2acl.FilterObjectPayloadHash:
+		k.typ, k.str = fKeyObjPayloadHash, ""
+	case v2acl.FilterObjectType:
+		k.typ, k.str = fKeyObjType, ""
+	case v2acl.FilterObjectHomomorphicHash:
+		k.typ, k.str = fKeyObjHomomorphicHash, ""
+	}
+}
+
 // NewFilter creates, initializes and returns blank Filter instance.
 //
 // Defaults:
@@ -134,7 +160,7 @@ func NewFilterFromV2(filter *v2acl.HeaderFilter) *Filter {
 
 	f.from = FilterHeaderTypeFromV2(filter.GetHeaderType())
 	f.matcher = MatchFromV2(filter.GetMatchType())
-	f.key.str = filter.GetKey()
+	f.key.fromString(filter.GetKey())
 	f.value = staticStringer(filter.GetValue())
 
 	return f
diff --git a/eacl/filter_test.go b/eacl/filter_test.go
index 9a471d0..7af8d68 100644
--- a/eacl/filter_test.go
+++ b/eacl/filter_test.go
@@ -1,6 +1,7 @@
 package eacl
 
 import (
+	"strconv"
 	"testing"
 
 	"github.com/nspcc-dev/neofs-api-go/v2/acl"
@@ -85,4 +86,17 @@ func TestFilter_ToV2(t *testing.T) {
 		require.Equal(t, acl.HeaderTypeUnknown, filterV2.GetHeaderType())
 		require.Equal(t, acl.MatchTypeUnknown, filterV2.GetMatchType())
 	})
+
+	t.Run("reserved types", func(t *testing.T) {
+		r := NewRecord()
+		for i := filterKeyType(1); i < fKeyObjLast; i++ {
+			r.addObjectReservedFilter(MatchStringEqual, i, staticStringer(strconv.FormatUint(uint64(i), 16)))
+		}
+
+		for i := range r.filters {
+			fv2 := r.filters[i].ToV2()
+			actual := NewFilterFromV2(fv2)
+			require.Equal(t, actual, &r.filters[i])
+		}
+	})
 }