ice-blockchain/nostr-dart

nostr_dart

A Dart Library for making Nostr clients.

Features

Add this library to your Dart app to:

• Connect to Nostr relays
• Start subscriptions using filters and get a handy Stream of decoded and verified messages
• Send Nostr events to relays
• Deal with Nostr Cryptography - sign and verify messages, generate private and public keys

Getting started

This lib is in beta. Please use with caution and file and potential issues you see on our issue tracker.

Usage

void main() async {
  setNostrLogLevel(NostrLogLevel.ALL);

  final NostrRelay relay = await NostrRelay.connect('wss://relay.damus.io');

  final RequestMessage requestMessage = RequestMessage()
      ..addFilter(const RequestFilter(kinds: [1], limit: 5))
      ..addFilter(
        RequestFilter(kinds: const [0], limit: 1, since: DateTime(2020)),
      );

  final NostrSubscription subscription = relay.subscribe(requestMessage);

  final StreamSubscription listener = subscription.messages.listen((event) {
    if (event is EoseMessage) {
      print('Stored events are received');
    }
  });

  await Future.delayed(const Duration(seconds: 2));

  relay.unsubscribe(subscription.id);
  listener.cancel();

  final KeyStore keyStore = KeyStore.generate();

  final EventMessage event = EventMessage.fromData(
    keyStore: keyStore,
    kind: 0,
    content: '{"name":"test"}',
  );

  final OkMessage result = await relay.sendEvent(event);

  print("Event is accepted - ${result.accepted} $result");
}