1. Proposed title of this feature request

Support for OAuth 2.0 PKCE (Proof Key for Code Exchange) in Red Hat Build of Keycloak (RHBK) integrations for Quay

2. What is the nature and description of the request?

This RFE requests the enablement and full support for OAuth 2.0 PKCE (Proof Key for Code Exchange) in Red Hat Build of Keycloak (RHBK), specifically for use in authentication flows involving:

• Red Hat Quay

3. Why does the customer need this? (List the business requirements here)

Security Compliance

4. List any affected packages or components.

• Red Hat Quay (when used with OIDC-based login via RHBK)

More info : 

https://github.com/quay/quay/blob/2844bddbdaa5500e626f3e00e2409d2eb81bb0a5/oauth/base.py#L144

params = { "client_id": self.client_id(), "redirect_uri": redirect_uri, "scope": " ".join(scopes), "state": quote(csrf_token), "code_challenge": code_challenge, # < missing "code_challenge_method": "S256", # < missing }