[#142] Support resolving container nicename

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

utils/util.go

@@ -0,0 +1,21 @@
+package utils
+
+import (
+	"context"
+
+	"github.com/nspcc-dev/neofs-http-gw/resolver"
+	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
+)
+
+// GetContainerID decode container id, if it's not a valid container id
+// then trey to resolve name using provided resolver.
+func GetContainerID(ctx context.Context, containerID string, resolver *resolver.ContainerResolver) (*cid.ID, error) {
+	cnrID := new(cid.ID)
+	err := cnrID.DecodeString(containerID)
+	if err != nil {
+		if resolver != nil {
+			cnrID, err = resolver.Resolve(ctx, containerID)
+		}
+	}
+	return cnrID, err
+}