When the HDF5 ROS3 driver is invoked, only the region, access key ID, and secret key are currently passed. However, to access NASA Earthdata S3 buckets, a session token is also required. While the HDF5 ROS3 driver does support a session token, it is not currently being utilized.

It would be beneficial to:

• Add support for passing a session token to the ROS3 driver.

• Parse all potential sources of credentials (e.g., environment variables and AWS config files) to determine the most appropriate set of credentials for accessing multiple buckets.

• Add support for S3 URIs such as:
  s3://ob-cumulus-prod-public/PACE_OCI.20240411T000331.L1B.V3.nc

I’ve created a development branch to address this issue:
👉 https://github.com/alexandervladsemenov/netcdf-c/tree/temp_credentials

The code has been tested and is functional. However, I believe the current mechanism for parsing URLs/URIs in netCDF could benefit from a broader redesign. I'd like to get input from the netCDF development team before proceeding further.

I’ll submit a draft pull request to facilitate feedback and discussion.