feat(09-11): add permissioned admin metadata and settings

cabana/contracts.go

@@ -75,7 +75,11 @@ type CompiledController struct {
 
 // Registry is the immutable controller map keyed by controller ID.
 type Registry struct {
-	byID map[string]*CompiledController
+	byID        map[string]*CompiledController
+	permissions map[string]pact.Permission
+	roleGrants  map[string]map[string]bool
+	navigation  []pact.NavigationItem
+	settings    map[string]*CompiledSetting
 }
 
 // Get returns the compiled controller for a D-09 id (vendor.plugin.controller).
@@ -87,6 +91,15 @@ func (r *Registry) Get(id string) (*CompiledController, bool) {
 	return cc, ok && cc != nil
 }
 
+// Setting returns one compiled singleton setting by stable code.
+func (r *Registry) Setting(code string) (*CompiledSetting, bool) {
+	if r == nil {
+		return nil, false
+	}
+	setting, ok := r.settings[code]
+	return setting, ok && setting != nil
+}
+
 // Allows reports whether principal satisfies every required permission code.
 // A nil principal fails. Superusers pass. An empty requirement list allows
 // any authenticated principal. Grants ending in ".*" match by prefix.