update auth example on readme to v0.19

README.md

@@ -122,34 +122,16 @@ E.g., https://github.com/fiatjaf/relayer with a relay implementing the relayer.A
 func main() {
 	url := "ws://localhost:7447"
 
-	// Once the connection is initiated the server will send "AUTH" with the challenge string.
-	relay, err := nostr.RelayConnect(context.Background(), url)
+	sk := nostr.GeneratePrivateKey()
+
+	relay, err := nostr.RelayConnect(context.Background(), url,
+        nostr.WithAuthHandler(func(ctx context.Context, authEvent *Event) (ok bool) {
+            authEvent.Sign(sk)
+        }),
+    )
 	if err != nil {
 		panic(err)
 	}
-
-	// Initialize test user.
-	sk := nostr.GeneratePrivateKey()
-	pub, _ := nostr.GetPublicKey(sk)
-	npub, _ := nip19.EncodePublicKey(pub)
-
-	// Relay.Challenges channel will receive the "AUTH" command.
-	challenge := <-relay.Challenges
-
-	// Create the auth event to send back.
-	// The user will be authenticated as pub.
-	event := nip42.CreateUnsignedAuthEvent(challenge, pub, url)
-	event.Sign(sk)
-
-	// Set-up context with 3 second time out.
-	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
-	defer cancel()
-
-	// Send the event by calling relay.Auth.
-	// Returned status is either success, fail, or sent (if no reply given in the 3 second timeout).
-	auth_status, err := relay.Auth(ctx, event)
-
-	fmt.Printf("authenticated as %s: %s\n", npub, auth_status)
 }
 ```