If archiver is used in combination with some other extension that implements its custom uploader, for example https://github.com/TkTech/ckanext-cloudstorage, archiver always uses default ckan uploader.
This PR fixes it to use get_resource_uploader which return uploaders implemented in extensions.
This also adds a check if get-path returns external URL.
If archiver is used in combination with some other extension that implements its custom uploader, for example https://github.com/TkTech/ckanext-cloudstorage, archiver always uses default ckan uploader.
This PR fixes it to use get_resource_uploader which return uploaders implemented in extensions.
This also adds a check if get-path returns external URL.