fix: Always return response from _do_http_method

Noticed a bug where the *first* time we queried an API after a long time
(in this case Sierra), we'd see a json decode error coming from the
requests modules `response.json()`. Since we weren't calling it on our
end, I dug through the trace a little and found that we call `.json()`
in this library *only* when the token is expired and we do a refresh,
which would explain the timing of the bug.

So simply, make sure to return the raw response object when we do a
token refresh.

Here's an example stacktrace of the bug we are encountering:

File /ereadingserver/./app/main.py, line 186, in login
File /ereadingserver/./app/auth/login.py, line 62, in log_in_with_card
File /ereadingserver/./app/sierra.py, line 106, in patron_is_valid
File /usr/local/lib/python3.10/site-packages/nypl_py_utils/classes/oauth2_api_client.py, line 63, in post
File /usr/local/lib/python3.10/site-packages/nypl_py_utils/classes/oauth2_api_client.py, line 106, in _do_http_method
File /usr/local/lib/python3.10/site-packages/requests/models.py, line 975, in json

src/nypl_py_utils/classes/oauth2_api_client.py

@@ -117,7 +117,7 @@ def _do_http_method(self, method, request_path, **kwargs):
                     from None
 
             self._generate_access_token()
-            return self._do_http_method(method, request_path, **kwargs).json()
+            return self._do_http_method(method, request_path, **kwargs)
 
     def _create_oauth_client(self):
         """

tests/test_oauth2_api_client.py

@@ -3,7 +3,7 @@
 import json
 import pytest
 from requests_oauthlib import OAuth2Session
-from requests import HTTPError, JSONDecodeError
+from requests import HTTPError, JSONDecodeError, Response
 
 from nypl_py_utils.classes.oauth2_api_client import (Oauth2ApiClient,
                                                      Oauth2ApiClientError)
@@ -120,7 +120,10 @@ def test_token_expiration(self, requests_mock, test_instance,
             .post(TOKEN_URL, text=json.dumps(second_token_response))
 
         # Perform second request:
-        test_instance._do_http_method('GET', 'foo')
+        response = test_instance._do_http_method('GET', 'foo')
+        # Ensure we still return a plain requests Response object
+        assert isinstance(response, Response)
+        assert response.json() == {"foo": "bar"}
         # Expect a call on the second token server:
         assert len(second_token_server_post.request_history) == 1
         # Expect the second GET request to carry the new Bearer token: