add warning if user is accessing data outside NSIDC bucket

icepyx/core/validate_inputs.py

@@ -104,3 +104,16 @@ def tracks(track):
             warnings.warn("Listed Reference Ground Track is not available")
 
         return track_list
+
+def check_s3bucket(path):
+    """
+    Check if the given path is an s3 path. Raise a warning if the data being referenced is not
+    in the NSIDC bucket
+    """
+    split_path = path.split('/')
+    if split_path[0] == 's3:' and split_path[2] != 'nsidc-cumulus-prod-protected':
+        warnings.warn(
+            's3 data being read from outside the NSIDC data bucket. Icepyx can '
+            'read this data, but available data lists may not be accurate.', stacklevel=2
+        )
+    return path

icepyx/core/variables.py

@@ -83,7 +83,7 @@ def __init__(
 
         # Set the product and version from either the input args or the file
         if path:
-            self._path = path
+            self._path = val.check_s3bucket(path)
             self._product = is2ref.extract_product(self._path, auth=self.auth)
             self._version = is2ref.extract_version(self._path, auth=self.auth)
         elif product: