APIServer: Add wiring for audit backend and policy rule evaluator (#115212)

pkg/apiserver/auditing/noop.go

@@ -0,0 +1,29 @@
+package auditing
+
+import (
+	auditinternal "k8s.io/apiserver/pkg/apis/audit"
+	"k8s.io/apiserver/pkg/audit"
+	"k8s.io/apiserver/pkg/authorization/authorizer"
+)
+
+// NoopBackend is a no-op implementation of audit.Backend
+type NoopBackend struct{}
+
+func ProvideNoopBackend() audit.Backend { return &NoopBackend{} }
+
+func (b *NoopBackend) ProcessEvents(k8sEvents ...*auditinternal.Event) bool { return false }
+
+func (NoopBackend) Run(stopCh <-chan struct{}) error { return nil }
+
+func (NoopBackend) Shutdown() {}
+
+func (NoopBackend) String() string { return "" }
+
+// NoopPolicyRuleEvaluator is a no-op implementation of audit.PolicyRuleEvaluator
+type NoopPolicyRuleEvaluator struct{}
+
+func ProvideNoopPolicyRuleEvaluator() audit.PolicyRuleEvaluator { return &NoopPolicyRuleEvaluator{} }
+
+func (NoopPolicyRuleEvaluator) EvaluatePolicyRule(authorizer.Attributes) audit.RequestAuditConfig {
+	return audit.RequestAuditConfig{Level: auditinternal.LevelNone}
+}