Charon/docs/implementation/PHASE5_SUMMARY.md

Phase 5 Implementation Summary

Status: ✅ COMPLETE Coverage: 88.0% Date: 2026-01-06

What Was Implemented

1. Plugin System Core (10 phases)

• ✅ Plugin interface and registry (pre-existing, validated)
• ✅ 10 built-in DNS providers (Cloudflare, Route53, DigitalOcean, GCP, Azure, Namecheap, GoDaddy, Hetzner, Vultr, DNSimple)
• ✅ Secure plugin loader with SHA-256 verification
• ✅ Plugin database model and migrations
• ✅ Complete REST API for plugin management
• ✅ DNS provider service integration with registry
• ✅ Caddy config builder integration
• ✅ PowerDNS example plugin (compiles to 14MB .so)
• ✅ Comprehensive unit tests (88.0% coverage)
• ✅ Main.go and routes integration

2. Key Files Created

backend/pkg/dnsprovider/builtin/
├── cloudflare.go, route53.go, digitalocean.go
├── googleclouddns.go, azure.go, namecheap.go
├── godaddy.go, hetzner.go, vultr.go, dnsimple.go
├── init.go (auto-registration)
└── builtin_test.go (unit tests)

backend/internal/services/
├── plugin_loader.go (new)
└── plugin_loader_test.go (new)

backend/internal/api/handlers/
└── plugin_handler.go (new)

plugins/powerdns/
├── main.go (example plugin)
├── README.md
└── powerdns.so (compiled)

3. Files Modified

backend/internal/services/dns_provider_service.go
  - Removed hardcoded provider lists
  - Added GetSupportedProviderTypes()
  - Added GetProviderCredentialFields()

backend/internal/caddy/config.go
  - Uses provider.BuildCaddyConfig() from registry
  - Propagation timeout from provider

backend/cmd/api/main.go
  - Import builtin providers
  - Initialize plugin loader
  - AutoMigrate Plugin model

backend/internal/api/routes/routes.go
  - Added plugin API routes
  - AutoMigrate Plugin model

backend/internal/api/handlers/dns_provider_handler_test.go
  - Added mock methods for new service interface

Test Results

Coverage: 88.0% (Required: 85%+)
Status: ✅ PASS
All packages compile: ✅ YES
PowerDNS plugin builds: ✅ YES (14MB)

API Endpoints

GET    /admin/plugins          - List all plugins
GET    /admin/plugins/:id      - Get plugin details
POST   /admin/plugins/:id/enable   - Enable plugin
POST   /admin/plugins/:id/disable  - Disable plugin
POST   /admin/plugins/reload   - Reload all plugins

Build Commands

# Build backend
cd backend && go build -v ./...

# Build PowerDNS plugin
cd plugins/powerdns
CGO_ENABLED=1 go build -buildmode=plugin -o powerdns.so main.go

# Run tests with coverage
cd backend
go test -v -coverprofile=coverage.txt ./...

Security Features

• ✅ SHA-256 signature verification
• ✅ Directory permission validation (rejects world-writable)
• ✅ Windows platform rejection (Go plugin limitation)
• ✅ Usage checking (prevents disabling in-use plugins)

Known Limitations

• Linux/macOS only (Go plugin constraint)
• CGO required (CGO_ENABLED=1)
• Same Go version required for plugin and Charon
• No hot reload (requires application restart)
• ~14MB per plugin (Go runtime embedded)

Next Steps

Frontend implementation (Phase 6) - Plugin management UI

Documentation

See PHASE5_PLUGINS_COMPLETE.md for full details.