add checker s3 func for uri

Author: valeriupredoi

activestorage/active.py

@@ -5,6 +5,7 @@
 import pathlib
 import urllib
 import pyfive
+import requests
 import s3fs
 import time
 
@@ -18,6 +19,13 @@
 from activestorage.hdf2numcodec import decode_filters
 
 
+def storage_is_s3(uri):
+    resp = requests.head(uri)
+    response = resp.headers["gateway-protocol"]
+    if response == "s3":
+        return True
+
+
 def load_from_s3(uri, storage_options=None):
     """
     Load a netCDF4-like object from S3.
@@ -53,7 +61,8 @@ def load_from_s3(uri, storage_options=None):
 
 def load_from_https(uri):
     """
-    Load a Dataset from a netCDF4 file on an https server (NGINX).
+    Load a pyfive.high_level.Dataset from a
+    netCDF4 file on an https server (NGINX).
     """
     #TODO need to test if NGINX server behind https://
     fs = fsspec.filesystem('http')