86 lines
2.2 KiB
Dart
86 lines
2.2 KiB
Dart
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import 'dart:convert';
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import 'dart:math';
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import 'package:actors/actors.dart';
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import 'package:bip340/bip340.dart' as bip340;
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import 'package:crypto/crypto.dart';
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sealed class SignerMessage {
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const SignerMessage();
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}
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final class SignEvent extends SignerMessage {
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final int kind;
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final List<List<String>> tags;
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final String content;
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final int? createdAt;
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const SignEvent({
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required this.kind,
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this.tags = const [],
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required this.content,
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this.createdAt,
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});
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}
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final class GetPublicKey extends SignerMessage {
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const GetPublicKey();
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}
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sealed class SignerResult {
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const SignerResult();
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}
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final class EventSigned extends SignerResult {
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final String event;
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const EventSigned(this.event);
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}
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final class PublicKeyResult extends SignerResult {
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final String publicKey;
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const PublicKeyResult(this.publicKey);
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}
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class NostrSignerActor with Handler<SignerMessage, SignerResult> {
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final String _privateKey;
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final String _publicKey;
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NostrSignerActor(String privateKey)
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: _privateKey = privateKey,
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_publicKey = bip340.getPublicKey(privateKey);
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@override
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Future<SignerResult> handle(SignerMessage message) => switch (message) {
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SignEvent(:final kind, :final tags, :final content, :final createdAt) =>
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Future.value(_signEvent(kind, tags, content, createdAt)),
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GetPublicKey() => Future.value(PublicKeyResult(_publicKey)),
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};
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EventSigned _signEvent(
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int kind,
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List<List<String>> tags,
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String content,
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int? createdAt,
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) {
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final ts = createdAt ?? DateTime.now().millisecondsSinceEpoch ~/ 1000;
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final ser = jsonEncode([0, _publicKey, ts, kind, tags, content]);
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final idBytes = sha256.convert(utf8.encode(ser)).bytes;
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final id = idBytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
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final rng = Random.secure();
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final auxBytes = List.generate(32, (_) => rng.nextInt(256));
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final aux = auxBytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
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final sig = bip340.sign(_privateKey, id, aux);
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return EventSigned(jsonEncode({
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'id': id,
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'pubkey': _publicKey,
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'created_at': ts,
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'kind': kind,
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'tags': tags,
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'content': content,
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'sig': sig,
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}));
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}
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}
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