[SOLR-16897] add support of OAuth 2.0/OIDC 'code with PKCE' flow (back-end)

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 9.4
• Assignee: Jan Høydahl
• Reporter: Lamine
• Created: 18/Jul/23 18:43
• Updated: 15/Oct/23 19:57
• Resolved: 03/Sep/23 15:50

Description

This is the "back-end" part of 'code with PKCE' contribution. 

The back-end code is mainly for configuration. This is where the different options are configured.

This PR adds tokenEndpoint and authorizationFlow options.

Issue Links

• links to: GitHub Pull Request #1792