Verify save token chips and preview counter

__init__.py

@@ -1,6 +1,7 @@
 from .dumas_image_nodes import (
     NODE_CLASS_MAPPINGS as IMAGE_NODE_CLASS_MAPPINGS,
     NODE_DISPLAY_NAME_MAPPINGS as IMAGE_NODE_DISPLAY_NAME_MAPPINGS,
+    _next_counter,
     resolve_serve_token,
 )
 from .dumas_json_nodes import (
@@ -84,6 +85,35 @@ try:
             return web.Response(status=404, text="unknown or expired preview token")
         return web.FileResponse(path)
 
+    @PromptServer.instance.routes.get("/dumas/api/save_image/next_counter")
+    async def dumas_save_image_next_counter(request):
+        folder_raw = str(request.query.get("folder", "") or "").strip()
+        name = str(request.query.get("name", "") or "")
+        try:
+            digits = max(1, min(8, int(request.query.get("digits", "3"))))
+        except Exception:
+            digits = 3
+
+        def _scan():
+            import folder_paths
+
+            output_dir = folder_paths.get_output_directory()
+            base = os.path.abspath(folder_raw) if folder_raw else output_dir
+            parts = [part for part in name.replace("\\", "/").split("/") if part]
+            if not parts:
+                return 1, ""
+            frame_dir = os.path.join(base, *parts[:-1])
+            counter = _next_counter(frame_dir, parts[-1])
+            resolved_name = parts[-1].replace("%counter%", str(counter).zfill(digits))
+            return counter, "/".join(parts[:-1] + [resolved_name])
+
+        try:
+            loop = asyncio.get_running_loop()
+            counter, resolved = await loop.run_in_executor(None, _scan)
+            return web.json_response({"ok": True, "counter": counter, "resolved": resolved})
+        except Exception as exc:
+            return web.json_response({"ok": False, "message": str(exc), "counter": 1, "resolved": ""})
+
     @PromptServer.instance.routes.get("/dumas/api/pick_directory")
     async def dumas_pick_directory(request):
         try: