implement NGFF source validation

mobie/validation/metadata.py

@@ -1,3 +1,4 @@
+import json
 import os
 
 # from elf.io import open_file
@@ -63,6 +64,14 @@ def bdv_check():
         path = os.path.join(dataset_folder, storage["relativePath"])
         assert_true(os.path.exists(path), f"Could not find data for {name} at {path}")
 
+        attr_path =os.path.join(path, ".zattrs")
+        assert_true(os.path.exists(attr_path), f"Could not find metadata for {name} at {path}")
+
+        with open(attr_path) as f:
+            zattr = json.load(f)
+
+        validate_with_schema(zattr, "NGFF")
+
         # we disable the name check for the time being since it seems to not be necessary,
         # AND restricting the name in this fashion prevents embedding existing ome.zarr files in mobie projects
         # with open_file(path, "r", ext=".zarr") as f:

mobie/validation/utils.py

@@ -13,6 +13,7 @@
     "source": "https://raw.githubusercontent.com/mobie/mobie.github.io/master/schema/source.schema.json",
     "view": "https://raw.githubusercontent.com/mobie/mobie.github.io/master/schema/view.schema.json",
     "views": "https://raw.githubusercontent.com/mobie/mobie.github.io/master/schema/views.schema.json",
+    "NGFF": "https://raw.githubusercontent.com/ome/ngff/main/0.4/schemas/image.schema"
 }