This commit fixes two OAuth issues in the Astrolabe app:
1. **Always use PKCE (RFC 9207)**:
- PKCE is now used for all OAuth flows (public and confidential clients)
- Previous code only used PKCE for public clients, causing failures
- Confidential clients now use both PKCE + client_secret (defense in depth)
- Nextcloud OIDC provider requires PKCE, so token exchange was failing
2. **Add token_broker to oauth_context**:
- Token broker is now stored in oauth_context for management API access
- Fixes "Token broker not configured" error when revoking access
- Revoke endpoint needs token_broker to delete refresh tokens and invalidate cache
Changes:
- OAuthController.php: Always generate PKCE verifier/challenge for all clients
- OAuthController.php: Always include code_verifier in token exchange
- app.py: Store token_broker in oauth_context after creation
Fixes:
- Astrolabe OAuth flow now works with Nextcloud OIDC
- Revoke/disconnect functionality now works in Astrolabe settings
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Chris Coutinho