Fix Asset exists check for files within folders when drag and dropping. (#725)

* Fix Asset exists check for files within folders when drag and droppping.

* fix path formation

* change code flow for reading dir for request.

* use default arg

Author: cancan101

public/js/pimcore/asset/tree.js

@@ -277,7 +277,8 @@
                  url: Routing.generate('pimcore_admin_asset_exists'),
                  params: {
                      parentId: parentNode.id,
-                     filename: file.name
+                     filename: file.name,
+                     dir: path
                  },
                  async: false,
                  success: function (response) {

src/Controller/Admin/Asset/AssetController.php

@@ -401,8 +401,20 @@ public function existsAction(Request $request): JsonResponse
     {
         $parentAsset = \Pimcore\Model\Asset::getById((int)$request->get('parentId'));
 
+        $dir = $request->get('dir', '');
+        if ($dir){
+            // this is for uploading folders with Drag&Drop
+            // param "dir" contains the relative path of the file
+            if (strpos($dir, '..') !== false) {
+                throw new \Exception('not allowed');
+            }
+            $dir =  '/' . trim($dir, '/ ');
+        }
+
+        $assetPath = $parentAsset->getRealFullPath() . $dir . '/' . $request->get('filename');
+
         return new JsonResponse([
-            'exists' => Asset\Service::pathExists($parentAsset->getRealFullPath().'/'.$request->get('filename')),
+            'exists' => Asset\Service::pathExists($assetPath),
         ]);
     }