OverwriteResponseEvent for optionally modifying events before sending them to client.

add-event.go

@@ -86,7 +86,11 @@ func (rl *Relay) AddEvent(ctx context.Context, evt *nostr.Event) error {
 		}
 	}
 
+	for _, ovw := range rl.OverwriteResponseEvent {
+		ovw(ctx, evt)
+	}
 	notifyListeners(evt)
+
 	return nil
 }
 

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/fasthttp/websocket v1.5.3
 	github.com/fiatjaf/eventstore v0.1.0
 	github.com/gobwas/ws v1.2.0
-	github.com/nbd-wtf/go-nostr v0.25.0
+	github.com/nbd-wtf/go-nostr v0.25.1
 	github.com/puzpuzpuz/xsync/v2 v2.5.1
 	github.com/rs/cors v1.7.0
 	golang.org/x/exp v0.0.0-20230425010034-47ecfdc1ba53

go.sum

@@ -90,8 +90,8 @@ github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJ
 github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/mattn/go-sqlite3 v1.14.17 h1:mCRHCLDUBXgpKAqIKsaAaAsrAlbkeomtRFKXh2L6YIM=
 github.com/mattn/go-sqlite3 v1.14.17/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
-github.com/nbd-wtf/go-nostr v0.25.0 h1:6ArnEX5NqjTaIBH6F5KYIJ0uw0uaKSWu8zjDb9za0Cg=
-github.com/nbd-wtf/go-nostr v0.25.0/go.mod h1:bkffJI+x914sPQWum9ZRUn66D7NpDnAoWo1yICvj3/0=
+github.com/nbd-wtf/go-nostr v0.25.1 h1:YTLTDUgngfzd3qQ0fWmQmq20flwnGtHH0g0Q8S3HlW4=
+github.com/nbd-wtf/go-nostr v0.25.1/go.mod h1:bkffJI+x914sPQWum9ZRUn66D7NpDnAoWo1yICvj3/0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

handlers.go

@@ -236,6 +236,9 @@ func (rl *Relay) HandleWebsocket(w http.ResponseWriter, r *http.Request) {
 
 							go func(ch chan *nostr.Event) {
 								for event := range ch {
+									for _, ovw := range rl.OverwriteResponseEvent {
+										ovw(ctx, event)
+									}
 									ws.WriteJSON(nostr.EventEnvelope{SubscriptionID: &id, Event: *event})
 								}
 								eose.Done()

relay.go

@@ -45,6 +45,7 @@ type Relay struct {
 	RejectFilter             []func(ctx context.Context, filter nostr.Filter) (reject bool, msg string)
 	RejectCountFilter        []func(ctx context.Context, filter nostr.Filter) (reject bool, msg string)
 	OverwriteDeletionOutcome []func(ctx context.Context, target *nostr.Event, deletion *nostr.Event) (acceptDeletion bool, msg string)
+	OverwriteResponseEvent   []func(ctx context.Context, event *nostr.Event)
 	StoreEvent               []func(ctx context.Context, event *nostr.Event) error
 	DeleteEvent              []func(ctx context.Context, event *nostr.Event) error
 	QueryEvents              []func(ctx context.Context, filter nostr.Filter) (chan *nostr.Event, error)