feat: activity log backend foundation

internal/domain/audit/auditRecorder.go

@@ -0,0 +1,31 @@
+package audit
+
+import "context"
+
+type Recorder interface {
+	Record(ctx context.Context, event Event)
+}
+
+type discardRecorder struct{}
+
+func (discardRecorder) Record(context.Context, Event) {}
+
+var Discard Recorder = discardRecorder{}
+
+type Origin struct {
+	Actor     Actor
+	Source    Source
+	IP        string
+	UserAgent string
+}
+
+type originContextKey struct{}
+
+func WithOrigin(ctx context.Context, origin Origin) context.Context {
+	return context.WithValue(ctx, originContextKey{}, origin)
+}
+
+func OriginFrom(ctx context.Context) (Origin, bool) {
+	origin, ok := ctx.Value(originContextKey{}).(Origin)
+	return origin, ok
+}