added logic to handle query params

Author: stevestencil

src/Routers/FilesRouter.js

@@ -78,8 +78,15 @@ export class FilesRouter {
   getHandler(req, res) {
     const config = Config.get(req.params.appId);
     const filesController = config.filesController;
-    const filename = req.params.filename;
+    let filename = req.params.filename;
     const contentType = mime.getType(filename);
+
+    const { query = {} } = req;
+    const params = Object.keys(query).map((key) => (`${encodeURIComponent(key)}=${encodeURIComponent(query[key])}`));
+    if (params.length) {
+      filename = `${filename}?${params.join('&')}`;
+    }
+
     if (isFileStreamable(req, filesController)) {
       filesController
         .handleFileStream(config, filename, req, res, contentType)