dart_ndk 0.1.0-dev8

Dart Nostr Development Kit

example/lib/main.dart

import 'dart:convert';

import 'package:amberflutter/amberflutter.dart';
import 'package:dart_ndk/nips/nip01/acinq_event_verifier.dart';
import 'package:dart_ndk/nips/nip01/event.dart';
import 'package:dart_ndk/nips/nip19/nip19.dart';
import 'package:flutter/material.dart';

late bool amberAvailable;

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  var amber = Amberflutter();
  amberAvailable = await amber.isAppInstalled();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Dart NDK Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final amber = Amberflutter();
  String _npub = '';
  String _pubkeyHex = '';
  String _text = '';
  String _cipherText = '';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(
          'Dart NDK Demo',
        ),
      ),
      body: Center(
        child: !amberAvailable?
        const Text("Amber not available") : Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            FilledButton(
              onPressed: () async {
                amber.getPublicKey(
                  permissions: [
                    const Permission(
                      type: "nip04_encrypt",
                    ),
                    const Permission(
                      type: "nip04_decrypt",
                    ),
                  ],
                ).then((value) {
                  _npub = value['signature'] ?? '';
                  _pubkeyHex = Nip19.decode(_npub);
                  setState(() {
                    _text = '$value';
                  });
                });
              },
              child: const Text('Get Public Key'),
            ),
            FilledButton(
              onPressed: () {
                final eventJson = jsonEncode({
                  'id': '',
                  'pubkey': Nip19.decode(_npub),
                  'kind': 1,
                  'content': 'Hello from Amber Flutter!',
                  'created_at': (DateTime.now().millisecondsSinceEpoch / 1000).round(),
                  'tags': [],
                  'sig': '',
                });

                amber
                    .signEvent(
                  currentUser: _npub,
                  eventJson: eventJson,
                )
                    .then((value) {
                  setState(() {
                    _text = '$value';
                  });
                });
              },
              child: const Text('Sign Event'),
            ),
            FilledButton(
              onPressed: () async {
                final eventJson = jsonEncode({
                  'id': '',
                  'pubkey': Nip19.decode(_npub),
                  'kind': 1,
                  'content': 'Hello from Amber Flutter!',
                  'created_at': (DateTime.now().millisecondsSinceEpoch / 1000).round(),
                  'tags': [],
                  'sig': '',
                });

                var value = await amber
                    .signEvent(
                  currentUser: _npub,
                  eventJson: eventJson,
                );
                AcinqSecp256k1EventVerifier eventVerifier = AcinqSecp256k1EventVerifier();
                eventVerifier.verify(Nip01Event.fromJson(json.decode(value['event']))).then((valid) {
                  setState(() {
                    _text = '${valid?"✅ Valid":"❌ Invalid"}';
                  });
                });
              },
              child: const Text('Verify signature'),
            ),
            FilledButton(
              onPressed: () {
                amber
                    .nip04Encrypt(
                  plaintext: "Hello from Amber Flutter, Nip 04!",
                  currentUser: _npub,
                  pubKey: _pubkeyHex,
                )
                    .then((value) {
                  _cipherText = value['signature'] ?? '';
                  setState(() {
                    _text = '$value';
                  });
                });
              },
              child: const Text('Nip 04 Encrypt'),
            ),
            FilledButton(
              onPressed: () async {
                amber
                    .nip04Decrypt(
                  ciphertext: _cipherText,
                  currentUser: _npub,
                  pubKey: _pubkeyHex,
                )
                    .then((value) {
                  setState(() {
                    _text = '$value 1';
                  });
                });
                // ;
                amber
                    .nip04Decrypt(
                  ciphertext: _cipherText,
                  currentUser: _npub,
                  pubKey: _pubkeyHex,
                )
                    .then((value) {
                  setState(() {
                    _text = '$value 2';
                  });
                });
                //   ,
                amber
                    .nip04Decrypt(
                  ciphertext: _cipherText,
                  currentUser: _npub,
                  pubKey: _pubkeyHex,
                )
                    .then((value) {
                  setState(() {
                    _text = '$value 3';
                  });
                });
              },
              child: const Text('Nip 04 Decrypt'),
            ),
            FilledButton(
              onPressed: () {
                amber
                    .nip44Encrypt(
                  plaintext: "Hello from Amber Flutter, Nip 44!",
                  currentUser: _npub,
                  pubKey: _pubkeyHex,
                )
                    .then((value) {
                  _cipherText = value['signature'] ?? '';
                  setState(() {
                    _text = '$value';
                  });
                });
              },
              child: const Text('Nip 44 Encrypt'),
            ),
            FilledButton(
              onPressed: () {
                amber
                    .nip44Decrypt(
                  ciphertext: _cipherText,
                  currentUser: _npub,
                  pubKey: _pubkeyHex,
                )
                    .then((value) {
                  setState(() {
                    _text = '$value';
                  });
                });
              },
              child: const Text('Nip 44 Decrypt'),
            ),
            Text(_text),
          ],
        ),
      ),
    );
  }
}