khatru: AllowDeleting hook (falls back to just checking direct authorship).

khatru/deleting.go

@@ -65,7 +65,7 @@ func (rl *Relay) handleDeleteRequest(ctx context.Context, evt nostr.Event) error
 			errg, ctx := errgroup.WithContext(ctx)
 			for target := range rl.QueryStored(ctx, f) {
 				// got the event, now check if the user can delete it
-				if target.PubKey == evt.PubKey {
+				if rl.AllowDeleting == nil && target.PubKey == evt.PubKey || rl.AllowDeleting != nil && rl.AllowDeleting(ctx, target, evt) {
 					// delete it
 					errg.Go(func() error {
 						if err := rl.DeleteEvent(ctx, target.ID); err != nil {

khatru/relay.go

@@ -75,6 +75,7 @@ type Relay struct {
 	DeleteEvent               func(ctx context.Context, id nostr.ID) error
 	OnEventSaved              func(ctx context.Context, event nostr.Event)
 	OnEventDeleted            func(ctx context.Context, deleted nostr.Event)
+	AllowDeleting             func(ctx context.Context, target, deletion nostr.Event) bool
 	OnEphemeralEvent          func(ctx context.Context, event nostr.Event)
 	OnRequest                 func(ctx context.Context, filter nostr.Filter) (reject bool, msg string)
 	OnCount                   func(ctx context.Context, filter nostr.Filter) (reject bool, msg string)