Missing /login_ajax endpoint on instance

[lexaSvarshik]

It should be patched, how it mentioned in #56, but I'm still getting the same output:
openedx2zim --course-url="https://apps.openedu.ru/learning/course/course-v1:urfu+PYAP+fall_2022/home" --publisher="edx201" --email="MY_EMAIL" --password "BEST_PASSWORD" --name="eba" --tmp-dir="output" --output="output" --debug --keep --format="mp4"

[openedx2zim::2023-01-01 20:13:40,806] INFO:Starting openedx2zim 1.0.1 with:
  Course URL: https://apps.openedu.ru/learning/course/course-v1:urfu+PYAP+fall_2022/home
  Email ID: MY_EMAIL
[openedx2zim::2023-01-01 20:13:40,806] DEBUG:Checking for missing binaries
[openedx2zim::2023-01-01 20:13:40,948] INFO:Testing openedx instance credentials ...
[openedx2zim::2023-01-01 20:13:46,776] ERROR:FAILED. An error occurred: Expecting value: line 7 column 1 (char 6)
[openedx2zim::2023-01-01 20:13:46,777] ERROR:Expecting value: line 7 column 1 (char 6)
Traceback (most recent call last):
  File "/home/svarka/.pyenv/versions/3.8.16/lib/python3.8/site-packages/openedx2zim/entrypoint.py", line 213, in main
    scraper.run()
  File "/home/svarka/.pyenv/versions/3.8.16/lib/python3.8/site-packages/openedx2zim/scraper.py", line 825, in run
    self.instance_connection.establish_connection()
  File "/home/svarka/.pyenv/versions/3.8.16/lib/python3.8/site-packages/openedx2zim/instance_connection.py", line 67, in establish_connection
    self.instance_connection = self.get_api_json(
  File "/home/svarka/.pyenv/versions/3.8.16/lib/python3.8/site-packages/openedx2zim/instance_connection.py", line 85, in get_api_json
    return json.loads(
  File "/home/svarka/.pyenv/versions/3.8.16/lib/python3.8/json/__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "/home/svarka/.pyenv/versions/3.8.16/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/home/svarka/.pyenv/versions/3.8.16/lib/python3.8/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 7 column 1 (char 6)

[rgaudin]

@lexaSvarshik thank you for your report.

The scraper expects the /login_ajax to to present and working to log into the openedX instance.

Using your URL, https://apps.openedu.ru/login_ajax redirects to https://courses.openedu.ru (the homepage). It's an HTML webpage, and not the expected JSON payload.

Tried https://courses.openedu.ru/login_ajax (after all, browser access does uses https://courses.openedu.ru/login_refresh) but it redirects to https://openedu.ru/login_ajax which is a 404.

Maybe the openedX version there is not supported or maybe some features used by the scraper have been disabled/removed.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be now be reviewed manually. Thank you for your contributions.

[benoit74]

Looking into this issue, the problem is that an external provider (https://sso.openedu.ru) is configured on this instance (and this external identity provider pages have been tweaked to "look like" the root openEdx website but this a separate tool, looks like it is a Keycloak instance).

I let @rgaudin confirm, but I think we should rename this issue "Add support for openedx instance with external identity provider / SSO configured". Probably the minimal first step would be to find a way to detect it and display a nice error in the logs.

[rgaudin]

I agree

[benoit74]

@lexaSvarshik I'm closing this as it is not a really bug, enhancement will be done with #172