feat: valid S3 expiration time

[ArturGaspar]

Description

Backports openedx#75.

Recommender XBlock will currently generate invalid URLs if used with S3 backend. This fixes that.

Using the filesystem backend should be unaffected as it ignores the timeout parameter (https://github.com/openedx/django-pyfs/blob/v3.4.1/djpyfs/djpyfs.py#L116).

Testing instructions

1. Configure openedx-django-pyfs to use S3

   DJFS = {
       'type': 's3fs',
       'bucket': AWS_STORAGE_BUCKET_NAME,
       'prefix': 'pyfs/',
       # Note that explicitly passing credentials requires openedx-django-pyfs >= 3.4.1
       'aws_access_key_id': AWS_ACCESS_KEY_ID,
       'aws_secret_access_key': AWS_SECRET_ACCESS_KEY
   }

2. Add a resource in the XBlock, include a screenshot
3. See that the screenshot is displayed
4. Configure openedx-django-pyfs to use the local filesystem

   DJFS = {
       'type': 'osfs',
       'directory_root': '/tmp/pyfs',
       'url_root': '/static/djpyfs'
   }

5. Add a resource in the XBlock, include a screenshot
6. See that the screenshot is displayed

Other information

Private-ref: https://tasks.opencraft.com/browse/BB-8077

[viadanna]

👍

• I tested this on a sandbox
• I read through the code
• Includes documentation