nkn_sdk_flutter 0.6.2 
nkn_sdk_flutter: ^0.6.2 copied to clipboard
Published 19 months ago • 
nkn.org
nkn.orgFlutter NKN SDK. Send and receive data for free between any NKN clients regardless their network condition without setting up a server or relying on any third party services.
import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:nkn_sdk_flutter/client.dart';
import 'package:nkn_sdk_flutter/crypto.dart';
import 'package:nkn_sdk_flutter/utils/hash.dart';
import 'package:nkn_sdk_flutter/utils/hex.dart';
import 'package:nkn_sdk_flutter/wallet.dart';
void main() {
WidgetsFlutterBinding.ensureInitialized();
Wallet.install();
Client.install();
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
Client? _client1;
Client? _client2;
@override
void initState() {
super.initState();
initPlatformState();
}
// Platform messages are asynchronous, so we initialize in an async method.
Future<void> initPlatformState() async {
// If the widget was removed from the tree while the asynchronous platform
// message was in flight, we want to discard the reply rather than calling
// setState to update our non-existent appearance.
if (!mounted) return;
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Plugin example app'),
),
body: Container(
padding: const EdgeInsets.only(top: 10),
child: Column(
children: [
Text(
'Wallet',
style: TextStyle(fontSize: 16),
),
Wrap(
children: [
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.create(null, config: WalletConfig(password: '123'));
print(wallet.address);
print(wallet.seed);
print(wallet.publicKey);
print(wallet.keystore);
print(wallet.programHash);
},
child: Text('create'),
),
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.restore(
'{"Version":2,"IV":"d103adf904b4b2e8cca9659e88201e5d","MasterKey":"20042c80ccb809c72eb5cf4390b29b2ef0efb014b38f7229d48fb415ccf80668","SeedEncrypted":"3bcdca17d84dc7088c4b3f929cf1e96cf66c988f2b306f076fd181e04c5be187","Address":"NKNVgahGfYYxYaJdGZHZSxBg2QJpUhRH24M7","Scrypt":{"Salt":"a455be75074c2230","N":32768,"R":8,"P":1}}',
config: WalletConfig(password: '123'));
print(wallet.address);
print(wallet.seed);
print(wallet.publicKey);
print(wallet.keystore);
print(wallet.programHash);
},
child: Text('restore'),
),
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.restore(
'{"Version":2,"IV":"d103adf904b4b2e8cca9659e88201e5d","MasterKey":"20042c80ccb809c72eb5cf4390b29b2ef0efb014b38f7229d48fb415ccf80668","SeedEncrypted":"3bcdca17d84dc7088c4b3f929cf1e96cf66c988f2b306f076fd181e04c5be187","Address":"NKNVgahGfYYxYaJdGZHZSxBg2QJpUhRH24M7","Scrypt":{"Salt":"a455be75074c2230","N":32768,"R":8,"P":1}}',
config: WalletConfig(password: '123'));
print(await wallet.getBalance());
},
child: Text('getBalance'),
),
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.restore(
'{"Version":2,"IV":"d103adf904b4b2e8cca9659e88201e5d","MasterKey":"20042c80ccb809c72eb5cf4390b29b2ef0efb014b38f7229d48fb415ccf80668","SeedEncrypted":"3bcdca17d84dc7088c4b3f929cf1e96cf66c988f2b306f076fd181e04c5be187","Address":"NKNVgahGfYYxYaJdGZHZSxBg2QJpUhRH24M7","Scrypt":{"Salt":"a455be75074c2230","N":32768,"R":8,"P":1}}',
config: WalletConfig(password: '123'));
print(await wallet.getBalance());
String? hash = await wallet.transfer(wallet.address, '0');
print(hash);
},
child: Text('transfer'),
),
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.restore(
'{"Version":2,"IV":"d103adf904b4b2e8cca9659e88201e5d","MasterKey":"20042c80ccb809c72eb5cf4390b29b2ef0efb014b38f7229d48fb415ccf80668","SeedEncrypted":"3bcdca17d84dc7088c4b3f929cf1e96cf66c988f2b306f076fd181e04c5be187","Address":"NKNVgahGfYYxYaJdGZHZSxBg2QJpUhRH24M7","Scrypt":{"Salt":"a455be75074c2230","N":32768,"R":8,"P":1}}',
config: WalletConfig(password: '123'));
int? nonce = await wallet.getNonce();
print(nonce);
},
child: Text('getNonce'),
),
TextButton(
onPressed: () async {
int? height = await Wallet.getHeight();
print(height);
},
child: Text('getHeight'),
),
TextButton(
onPressed: () async {
int? nonce = await Wallet.getNonceByAddress('NKNVgahGfYYxYaJdGZHZSxBg2QJpUhRH24M7');
print(nonce);
},
child: Text('getNonceByAddress'),
),
],
),
Text(
'Client1',
style: TextStyle(fontSize: 16),
),
Wrap(
children: [
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.restore(
'{"Version":2,"IV":"d103adf904b4b2e8cca9659e88201e5d","MasterKey":"20042c80ccb809c72eb5cf4390b29b2ef0efb014b38f7229d48fb415ccf80668","SeedEncrypted":"3bcdca17d84dc7088c4b3f929cf1e96cf66c988f2b306f076fd181e04c5be187","Address":"NKNVgahGfYYxYaJdGZHZSxBg2QJpUhRH24M7","Scrypt":{"Salt":"a455be75074c2230","N":32768,"R":8,"P":1}}',
config: WalletConfig(password: '123'));
await _client1?.close();
_client1 = await Client.create(
wallet.seed,
config: ClientConfig(
dnsResolverConfig: [
DnsResolverConfig(
dnsServer: '8.8.8.8:53',
),
],
),
);
print('-------------_client1----------');
print(_client1?.address);
_client1?.onConnect.listen((event) {
print('------onConnect1-----');
print(event.node);
});
Map dic = Map();
_client1?.onMessage.listen((event) {
print('------onMessage1-----');
if (dic[event.src] == null) {
dic[event.src] = 1;
} else {
dic[event.src] += 1;
}
print(dic[event.src]);
// print(event.type);
// print(event.encrypted);
// print(event.messageId);
print(event.data);
// print(event.src);
print(event.noReply);
if (event.noReply != true) {
event.reply(jsonEncode({'id': DateTime.now().millisecondsSinceEpoch.toString(), 'contentType': 'text', 'content': 'reply'}));
}
});
},
child: Text('create'),
),
TextButton(
onPressed: () async {
_client1?.close();
},
child: Text('close'),
),
TextButton(
onPressed: () async {
await _client1?.reconnect();
},
child: Text('reconnect')),
TextButton(
onPressed: () async {
print(jsonEncode({'id': DateTime.now().millisecondsSinceEpoch.toString(), 'contentType': 'text', 'content': 'hi'}));
var res = await _client1
?.sendText([_client2!.address], jsonEncode({'id': DateTime.now().millisecondsSinceEpoch.toString(), 'contentType': 'text', 'content': 'hi'}));
print(res);
},
child: Text('sendText'),
),
TextButton(
onPressed: () async {
var res = await _client1?.subscribe(topic: genChannelId('ttest'));
print(res);
},
child: Text('subscribe'),
),
TextButton(
onPressed: () async {
var res = await _client1?.unsubscribe(topic: genChannelId('ttest'));
print(res);
},
child: Text('unsubscribe'),
),
TextButton(
onPressed: () async {
var res = await _client1?.getSubscribersCount(topic: genChannelId('ttest'));
print(res);
},
child: Text('getSubscribersCount'),
),
TextButton(
onPressed: () async {
var res = await _client1?.getSubscription(topic: genChannelId('ttest'), subscriber: _client1!.address);
print(res);
},
child: Text('getSubscription'),
),
TextButton(
onPressed: () async {
var res = await _client1?.getSubscribers(topic: genChannelId('ttest'));
print(res);
},
child: Text('getSubscribers'),
),
TextButton(
onPressed: () async {
var res = await _client1?.getHeight();
print(res);
},
child: Text('getHeight'),
),
TextButton(
onPressed: () async {
var res = await _client1?.getNonce();
print(res);
},
child: Text('getNonce'),
),
TextButton(
onPressed: () async {
var res = await _client1?.getNonceByAddress('NKNVgahGfYYxYaJdGZHZSxBg2QJpUhRH24M7');
print(res);
},
child: Text('getNonceByAddress'),
),
],
),
Text(
'Client2',
style: TextStyle(fontSize: 16),
),
Wrap(
children: [
TextButton(
onPressed: () async {
await _client2?.close();
_client2 = await Client.create(hexDecode('bd8bd3de4dd0f798fac5a0a56e536a8bacd5b7f46d0951d8665fd68d0a910996'));
_client2?.onConnect.listen((event) {
print('------onConnect2-----');
print(event.node);
});
_client2?.onMessage.listen((event) {
print('------onMessage2-----');
print(event.type);
print(event.encrypted);
print(event.messageId);
print(event.data);
print(event.src);
});
},
child: Text('create'),
),
TextButton(
onPressed: () async {
_client2?.close();
},
child: Text('close'),
),
TextButton(
onPressed: () async {
var res = await _client2?.sendText([_client1!.address], jsonEncode({'contentType': 'text', 'content': 'hi2'}), noReply: false);
print(res?.data);
},
child: Text('sendText'),
),
],
),
Text(
'Crypto',
style: TextStyle(fontSize: 16),
),
Wrap(
children: [
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.create(hexDecode('a2df9fafa747b4da6afa58cdee8e170f0a71815584c3ed3bfa52040c89d0bd61'), config: WalletConfig(password: '123'));
Uint8List privateKey = await Crypto.getPrivateKeyFromSeed(wallet.seed);
var res = await Crypto.sign(privateKey, Uint8List.fromList(utf8.encode('Hello, world!')));
print(hexEncode(res));
},
child: Text('sign'),
),
TextButton(
onPressed: () async {
Wallet wallet = await Wallet.create(hexDecode('a2df9fafa747b4da6afa58cdee8e170f0a71815584c3ed3bfa52040c89d0bd61'), config: WalletConfig(password: '123'));
bool verified = await Crypto.verify(wallet.publicKey, Uint8List.fromList(utf8.encode('Hello, world!')),
hexDecode('fc81c36aa9002bb973fb7db3b8d334ae52194edf5e051d4c5105d20fbbad7287cd5172aea0acac43d843bf3b692aa486d96e4dcfbed9b7dcfb6e7c385c070d0d'));
print(verified);
},
child: Text('verify'),
),
],
),
],
),
),
),
);
}
}Metadata
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Documentation
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Metadata
Flutter NKN SDK. Send and receive data for free between any NKN clients regardless their network condition without setting up a server or relying on any third party services.
Repository (GitHub)
View/report issues
License
Apache-2.0 (license)
Dependencies
convert, crypto, flutter, logger
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