[#212] Support CORS container for CORS settings

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

utils/attributes.go

@@ -11,6 +11,8 @@ import (
 	"time"
 	"unicode"
 	"unicode/utf8"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 )
 
 type EpochDurations struct {
@@ -256,3 +258,12 @@ func (t systemTransformer) updateExpirationHeader(headers map[string]string, dur
 
 	headers[t.expirationEpochAttr()] = strconv.FormatUint(expirationEpoch, 10)
 }
+
+func GetAttributeValue(attrs []object.Attribute, key string) string {
+	for _, attr := range attrs {
+		if attr.Key() == key {
+			return attr.Value()
+		}
+	}
+	return ""
+}