fix: Complete Keycloak external IdP integration with all tests passing
This commit completes the Keycloak external IdP integration for the MCP
server, implementing ADR-002 Tier 2 (External Identity Provider) with
full Bearer token authentication support.
Key Changes:
1. **Keycloak backchannel-dynamic configuration**
- Added --hostname-strict=false and --hostname-backchannel-dynamic=true
- Allows external issuer (localhost:8888) with internal endpoints (keycloak:8080)
- Solves Docker networking issue where containers can't reach localhost
2. **CORSMiddleware Bearer token patch**
- Created app-hooks/patches/cors-bearer-token.patch from upstream commit 8fb5e77db82
- Allows Bearer tokens to bypass CORS/CSRF checks (stateless authentication)
- Applied via post-installation hook 20-apply-cors-bearer-token-patch.sh
- Enables app-specific APIs (Notes, Calendar, etc.) to work with Bearer tokens
3. **Patch organization**
- Moved patches to app-hooks/patches/ directory
- Updated docker-compose.yml to mount entire app-hooks directory
- Consolidated patch management for better maintainability
4. **Test improvements**
- All 11 Keycloak integration tests passing
- Tests validate OAuth token acquisition, MCP connectivity, token validation,
tool execution, token persistence, user provisioning, scope filtering,
and error handling
Architecture:
- Keycloak acts as external OAuth/OIDC identity provider
- MCP server uses Keycloak tokens to access Nextcloud APIs
- Nextcloud user_oidc app validates Bearer tokens from Keycloak
- No admin credentials needed - all API access uses user's OAuth tokens
Cache Note:
- Discovery and JWKS caches must be cleared when switching Keycloak configurations
- Use: docker compose exec redis redis-cli DEL "<cache-key>"
- Or: docker compose exec app php occ user_oidc:provider keycloak --clientid nextcloud
Related:
- ADR-002: Vector sync background jobs authentication
- Validates external IdP integration pattern
- Demonstrates offline_access with refresh tokens (Tier 1 & 2)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Chris Coutinho
849c67c32a