[#362] cli/object: Support JSON input of search filter

Consider single word of search filter expression as path to file with
protobuf JSON filters. Decode filters from file and add them to the rest.

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

cmd/neofs-cli/modules/object.go

@@ -141,7 +141,7 @@ func init() {
 	objectSearchCmd.Flags().String("cid", "", "Container ID")
 	_ = objectSearchCmd.MarkFlagRequired("cid")
 	objectSearchCmd.Flags().StringSliceVarP(&searchFilters, "filters", "f", nil,
-		"Repeated filter expressions")
+		"Repeated filter expressions or files with protobuf JSON")
 	objectSearchCmd.Flags().Bool("root", false, "Search for user objects")
 	objectSearchCmd.Flags().Bool("phy", false, "Search physically stored objects")
 	objectSearchCmd.Flags().String(searchOIDFlag, "", "Search object by identifier")
@@ -541,6 +541,19 @@ func parseSearchFilters(cmd *cobra.Command) (object.SearchFilters, error) {
 		switch len(words) {
 		default:
 			return nil, fmt.Errorf("invalid field number: %d", len(words))
+		case 1:
+			data, err := ioutil.ReadFile(words[0])
+			if err != nil {
+				return nil, err
+			}
+
+			subFs := object.NewSearchFilters()
+
+			if err := subFs.UnmarshalJSON(data); err != nil {
+				return nil, err
+			}
+
+			fs = append(fs, subFs...)
 		case 2:
 			m, ok := searchUnaryOpVocabulary[words[1]]
 			if !ok {