dev add method link

src/main/java/ru/soune/nocopy/controller/ApiController.java

@@ -533,6 +533,13 @@ public class ApiController {
             String tokenHeader = viewerRequest.getToken();
             Long userId = tokenHeader == null ? 0L: authService.useUserAuthToken(tokenHeader);
 
+            if (viewerRequest.getFileId() == null) {
+                return ResponseEntity.ok().body(new BaseResponse(0,
+                        MessageCode.NOT_VALID_FIELD.getCode(),
+                        MessageCode.NOT_VALID_FIELD.getDescription(),
+                        "file_id is required"));
+            }
+
             FileEntityResponse entityResponse = fileEntityService.getById(viewerRequest.getFileId(), 0);
             FileStatus status = entityResponse.getStatus();