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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
257076194 MDExOlB1bGxSZXF1ZXN0MTQwNjA0Njc2 1570 Support opening password protected datasets over Opendap (Fixes #1068) mrpgraae 3639582 closed 0     9 2017-09-12T15:01:02Z 2018-10-11T04:49:50Z 2017-09-15T16:00:05Z CONTRIBUTOR   0 pydata/xarray/pulls/1570
  • [x] Closes #1068
  • [x] Tests added / passed
  • [x] Passes git diff upstream/master | flake8 --diff
  • [x] Fully documented, including whats-new.rst for all changes and api.rst for new API

Changed PydapDataStore to be initialized with a Pydap dataset (returned by pydap.client.open_url). Also added a open classmethod to PydapDataStore, for opening with a url. The open classmethod also takes an optional session object, allowing the api discussed in #1068:

pydap_ds = pydap.client.open_url(url, session=session) store = xarray.backends.PydapDataStore(pydap_ds) ds = xarray.open_dataset(store) or store = xarray.backends.PydapDataStore.open(url, session=session) ds = xarray.open_dataset(store)

I tested this with NASA Earthdata as you can see in the added testcase, so i used a session object returned from pydap.cas.urs.setup_session() as that function is tailored for that. However, it just returns a Session object from the requests library, so maybe homemade requests sessions can work with other sites. I haven't been able to find other freely accessible but password-protected data repositories.

I thought about adding the other keyword parameters from pydap.client.open_url to xarray.backends.PydapDataStore.open but I was unsure whether that would be a good idea? Also, if we should do it, would it be okay to just pass **kwargs on to pydap.client.open_url?

Any constructive feedback and/or proposed changes are highly welcome of course. By the way, this is my first time contributing to an open source project like this, so please let me know if there is anything I should have done otherwise!

 
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