dvote 0.4.0 dvote: ^0.4.0 copied to clipboard
Flutter plugin to allow native mobile apps to interact with Vocdoni decentralized votes.
import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:convert';
import 'package:flutter/services.dart';
import 'package:dvote/dvote.dart';
final vocGateway = "ws://gateway:2082/dvote";
final web3Gateway = "http://gateway:8545/web3";
final resolverAddress = "0x0dCA233CE5152d58c74E74693A3C496D01542244";
final entityId =
"0x180dd5765d9f7ecef810b565a2e5bd14a3ccd536c442b3de74867df552855e85";
final privKeyToSign =
"fad9c8855b740a0b7ed4c221dbad0f33a83a49cad6b3fe8d5817ac83d38b6a19";
final publicKey =
"0x049a7df67f79246283fdc93af76d4f8cdd62c4886e8cd870944e817dd0b97934fdd7719d0810951e03418205868a5c1b40b192451367f28e0088dd75e15de40c05";
final messageToSign = "hello";
final messageToEncrypt = 'This is the super secret text message';
final passphrase = "One key to rule them all";
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
String _mnemonic = '(mnemonic)';
String _privKey = '(priv key)';
String _pubKey = '(pub key)';
String _address = '(addr)';
String _signature = "-";
bool _validSignature = false;
String _cipherText = "-";
String _decryptedMessage = "-";
Entity _entityMeta;
String _error;
@override
void initState() {
super.initState();
initPlatformState();
}
// Platform messages are asynchronous, so we initialize in an async method.
Future<void> initPlatformState() async {
String mnemonic, privKey, pubKey, addr;
String signature;
bool valid;
String cipherText, decryptedText;
Entity entityMeta;
String error;
// Platform messages may fail, so we use a try/catch PlatformException.
try {
mnemonic = await Dvote.generateMnemonic(size: 192);
privKey = await Dvote.mnemonicToPrivateKey(mnemonic);
pubKey = await Dvote.mnemonicToPublicKey(mnemonic);
addr = await Dvote.mnemonicToAddress(mnemonic);
signature = await Dvote.signString(messageToSign, privKeyToSign);
valid = await Dvote.verifySignature(signature, messageToSign, publicKey);
cipherText = await Dvote.encryptString(messageToEncrypt, passphrase);
decryptedText = await Dvote.decryptString(cipherText, passphrase);
} on PlatformException catch (err) {
error = err.message;
} catch (err) {
error = err;
}
// 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;
if (error != null) {
setState(() {
_error = error;
});
return;
}
setState(() {
_mnemonic = mnemonic;
_privKey = privKey;
_pubKey = pubKey;
_address = addr;
_signature = signature;
_validSignature = valid ?? false;
_cipherText = cipherText;
_decryptedMessage = decryptedText;
});
try {
entityMeta = await fetchEntity(
entityId,
resolverAddress,
"1234", // network id
vocGateway,
web3Gateway,
);
} catch (err) {
error = err;
print(err);
}
setState(() {
_entityMeta = entityMeta;
_error = error;
});
}
@override
Widget build(BuildContext context) {
if (_error != null) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('DVote plugin example'),
),
body: Container(
child: Text("Error: " + _error),
),
),
);
}
final signingData =
"Signing '$messageToSign' with $privKeyToSign:\n\n$_signature\n\nThe signature is ${_validSignature ? "valid" : "not valid"}";
final encryptionData = '''Original message: \n > $messageToEncrypt\n
Encryption key: \n > $passphrase\n
Encrypted message: \n > $_cipherText\n
Decrypted message: \n > $_decryptedMessage''';
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('DVote plugin example'),
),
body: ListView(
children: <Widget>[
Padding(
padding: EdgeInsets.all(16),
child: Column(
children: <Widget>[
Text("HD WALLET:"),
SizedBox(height: 30),
Text('Mnemonic: \n$_mnemonic'),
SizedBox(height: 15),
Text('Private key: \n$_privKey'),
SizedBox(height: 15),
Text('Public key: \n$_pubKey'),
SizedBox(height: 15),
Text('Address: \n$_address'),
],
),
),
Divider(),
Padding(
padding: EdgeInsets.all(16),
child: Column(
children: <Widget>[
Text("SIGNING:"),
SizedBox(height: 30),
Text(signingData),
],
),
),
Divider(),
Padding(
padding: EdgeInsets.all(16),
child: Column(
children: <Widget>[
Text("ENCRYPTION:"),
SizedBox(height: 30),
Text(encryptionData),
],
),
),
Divider(),
Padding(
padding: EdgeInsets.all(16),
child: _entityMeta == null
? null
: Column(
children: <Widget>[
Text("ENTITY META:"),
SizedBox(height: 30),
Text(jsonEncode(_entityMeta.toJson())),
],
),
),
],
),
),
);
}
}