implement nip-11, relay information document.

handlers.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/fiatjaf/go-nostr"
+	"github.com/fiatjaf/go-nostr/nip11"
 	"github.com/gorilla/websocket"
 )
 
@@ -193,3 +194,25 @@ func handleWebsocket(relay Relay) func(http.ResponseWriter, *http.Request) {
 		}()
 	}
 }
+
+func handleNIP11(relay Relay) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+
+		info := nip11.RelayInformationDocument{
+			Name:          relay.Name(),
+			Description:   "relay powered by the relayer framework",
+			PubKey:        "~",
+			Contact:       "~",
+			SupportedNIPs: []int{9, 15, 16},
+			Software:      "https://github.com/fiatjaf/relayer",
+			Version:       "~",
+		}
+
+		if ifmer, ok := relay.(Informationer); ok {
+			info = ifmer.GetNIP11InformationDocument()
+		}
+
+		json.NewEncoder(w).Encode(info)
+	}
+}

interface.go

@@ -2,6 +2,7 @@ package relayer
 
 import (
 	"github.com/fiatjaf/go-nostr"
+	"github.com/fiatjaf/go-nostr/nip11"
 )
 
 var Log = log
@@ -16,3 +17,7 @@ type Relay interface {
 type Injector interface {
 	InjectEvents() chan nostr.Event
 }
+
+type Informationer interface {
+	GetNIP11InformationDocument() nip11.RelayInformationDocument
+}

start.go

@@ -16,8 +16,10 @@ type Settings struct {
 	Port string `envconfig:"PORT" default:"7447"`
 }
 
-var s Settings
-var log = zerolog.New(os.Stderr).Output(zerolog.ConsoleWriter{Out: os.Stderr})
+var (
+	s   Settings
+	log = zerolog.New(os.Stderr).Output(zerolog.ConsoleWriter{Out: os.Stderr})
+)
 
 var Router = mux.NewRouter()
 
@@ -33,6 +35,9 @@ func Start(relay Relay) {
 	// catch the websocket call before anything else
 	Router.Path("/").Headers("Upgrade", "websocket").HandlerFunc(handleWebsocket(relay))
 
+	// nip-11, relay information
+	Router.Path("/").Headers("Accept", "application/nostr+json").HandlerFunc(handleNIP11(relay))
+
 	// allow implementations to do initialization stuff
 	if err := relay.Init(); err != nil {
 		Log.Fatal().Err(err).Msg("failed to start")