[#271] object: Add UserAttributes method

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

object/object.go

@@ -3,7 +3,10 @@ package object
 import (
 	"errors"
 	"fmt"
+	"slices"
+	"strings"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container"
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
 	v2session "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
@@ -312,6 +315,26 @@ func (o *Object) Attributes() []Attribute {
 	return res
 }
 
+// UserAttributes returns object user attributes.
+func (o *Object) UserAttributes() []Attribute {
+	attrs := (*object.Object)(o).
+		GetHeader().
+		GetAttributes()
+
+	res := make([]Attribute, 0, len(attrs))
+
+	for _, attr := range attrs {
+		key := attr.GetKey()
+
+		if !strings.HasPrefix(key, container.SysAttributePrefix) &&
+			!strings.HasPrefix(key, container.SysAttributePrefixNeoFS) {
+			res = append(res, *NewAttributeFromV2(&attr))
+		}
+	}
+
+	return slices.Clip(res)
+}
+
 // SetAttributes sets object attributes.
 func (o *Object) SetAttributes(v ...Attribute) {
 	attrs := make([]object.Attribute, len(v))

object/object_test.go

@@ -3,8 +3,10 @@ package object_test
 import (
 	"testing"
 
+	v2container "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/container"
 	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	objecttest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/test"
 	usertest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user/test"
 	"github.com/stretchr/testify/require"
 )
@@ -24,3 +26,26 @@ func TestInitCreation(t *testing.T) {
 	require.Equal(t, cnr, cID)
 	require.Equal(t, own, o.OwnerID())
 }
+
+func Test_Attributes(t *testing.T) {
+	obj := objecttest.Object()
+
+	t.Run("get user attributes", func(t *testing.T) {
+		// See how we create a test object. It's created with two attributes.
+		require.Len(t, obj.UserAttributes(), 2)
+	})
+
+	userAttrs := obj.UserAttributes()
+
+	sysAttr := *object.NewAttribute()
+	sysAttr.SetKey(v2container.SysAttributePrefix + "key")
+	sysAttr.SetValue("value")
+
+	attr := append(userAttrs, sysAttr)
+	obj.SetAttributes(attr...)
+
+	t.Run("get attributes", func(t *testing.T) {
+		require.ElementsMatch(t, obj.UserAttributes(), userAttrs)
+		require.ElementsMatch(t, obj.Attributes(), attr)
+	})
+}