fix broken owncloud downloads

 * owncloud gzips some file types (yml, json). Send the
   Accept-Encoding: identity header allow to return actual file size
   not archived to read it properly

 * update owncloud test_download_range to work with new download
   headers changes

Author: mkovalua

tests/providers/owncloud/test_provider.py

@@ -176,7 +176,8 @@ async def test_download_range(self, provider, file_metadata):
         assert result.partial
         content = await result.response.read()
         assert content == b'sq'
-        assert aiohttpretty.has_call(method='GET', uri=url, headers={'Range': 'bytes=0-1'})
+        headers={'Range': 'bytes=0-1', 'Accept-Encoding': 'identity'}
+        assert aiohttpretty.has_call(method='GET', uri=url, headers=headers)
 
     @pytest.mark.asyncio
     @pytest.mark.aiohttpretty

waterbutler/providers/owncloud/provider.py

@@ -147,9 +147,11 @@ async def download(self, path, accept_url=False, range=None, **kwargs):
             'got_accept_url': accept_url is False,
             'got_range': range is not None,
         })
+        # Accept-Encoding: identity header tells owncloud not to zip certain text formats
         download_resp = await self.make_request(
             'GET',
             self._webdav_url_ + path.full_path,
+            headers={'Accept-Encoding': 'identity'},
             range=range,
             expects=(200, 206,),
             throws=exceptions.DownloadError,