Fix asset export error handling for empty directories

app/Http/Controllers/AssetController.php

@@ -17,6 +17,11 @@ class AssetController extends Controller
         }
 
         $storagePublic = storage_path('app/public');
+
+        if (!is_dir($storagePublic)) {
+            mkdir($storagePublic, 0775, true);
+        }
+
         $zip = new ZipArchive();
         $zipPath = storage_path('exports/assets-'.date('YmdHis').'.zip');
 
@@ -24,11 +29,13 @@ class AssetController extends Controller
             mkdir(storage_path('exports'), 0775, true);
         }
 
-        if ($zip->open($zipPath, ZipArchive::CREATE) === true) {
-            $this->addDirectoryToZip($zip, $storagePublic, '');
-            $zip->close();
+        if ($zip->open($zipPath, ZipArchive::CREATE) !== true) {
+            abort(500, 'Failed to create ZIP archive');
         }
 
+        $this->addDirectoryToZip($zip, $storagePublic, '');
+        $zip->close();
+
         return response()->download($zipPath)->deleteFileAfterSend(true);
     }
 
@@ -80,7 +87,14 @@ class AssetController extends Controller
 
     private function addDirectoryToZip(ZipArchive $zip, string $dir, string $zipPath): void
     {
-        $files = scandir($dir);
+        if (!is_dir($dir)) {
+            return;
+        }
+
+        $files = @scandir($dir);
+        if ($files === false) {
+            return;
+        }
 
         foreach ($files as $file) {
             if ($file === '.' || $file === '..') {
@@ -88,13 +102,13 @@ class AssetController extends Controller
             }
 
             $path = $dir.DIRECTORY_SEPARATOR.$file;
-            $zipPath = $zipPath === '' ? $file : $zipPath.'/'.$file;
+            $newZipPath = $zipPath === '' ? $file : $zipPath.'/'.$file;
 
             if (is_dir($path)) {
-                $zip->addEmptyDir($zipPath);
-                $this->addDirectoryToZip($zip, $path, $zipPath);
-            } else {
-                $zip->addFile($path, $zipPath);
+                $zip->addEmptyDir($newZipPath);
+                $this->addDirectoryToZip($zip, $path, $newZipPath);
+            } elseif (is_file($path)) {
+                $zip->addFile($path, $newZipPath);
             }
         }
     }