source/blender/editors/sculpt_paint/paint_ops.cc

@@ -1237,6 +1237,38 @@ static bool asset_is_editable(const AssetWeakReference &asset_weak_ref)
   return true;
 }
 
+static bool asset_is_editable(const AssetWeakReference &asset_weak_ref)
+{
+  /* Fairly simple checks, based on filepath only:
+   *   - The blendlib filepath ends up with the `.asset.blend` extension.
+   *   - The blendlib is located in the expected sub-directory of the editable asset library.
+   *
+   * TODO: Right now no check is done on file content, e.g. to ensure that the blendlib file has
+   * not been manually edited by the user (that it does not have any UI IDs e.g.). */
+
+  char path_buffer[FILE_MAX_LIBEXTRA];
+  char *dir, *group, *name;
+  AS_asset_full_path_explode_from_weak_ref(&asset_weak_ref, path_buffer, &dir, &group, &name);
+
+  if (!StringRef(dir).endswith(BLENDER_ASSET_FILE_SUFFIX)) {
+    return false;
+  }
+
+  const bUserAssetLibrary *library = BKE_preferences_asset_library_find_by_name(
+      &U, asset_weak_ref.asset_library_identifier);
+  if (!library) {
+    return false;
+  }
+
+  std::string root_path_for_save = brush_asset_root_path_for_save(*library);
+  if (root_path_for_save.empty() || !StringRef(dir).startswith(root_path_for_save)) {
+    return false;
+  }
+
+  /* TODO: Do we want more checks here? E.g. check actual content of the file? */
+  return true;
+}
+
 static int brush_asset_save_as_exec(bContext *C, wmOperator *op)
 {
   Paint *paint = BKE_paint_get_active_from_context(C);