wallet_connect_v2 1.0.5 
wallet_connect_v2: ^1.0.5 copied to clipboard
Wallet Connect V2 for Flutter, available for both Wallet and DApp to interact easier
example/lib/main.dart
import 'dart:convert';
import 'package:bip32/bip32.dart' as bip32;
import 'package:bip39/bip39.dart' as bip39;
import 'package:eth_sig_util/eth_sig_util.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:hex/hex.dart';
import 'package:http/http.dart' hide Request;
import 'package:shared_preferences/shared_preferences.dart';
import 'package:url_launcher/url_launcher.dart';
import 'package:wallet_connect_v2/wallet_connect_v2.dart';
import 'package:web3dart/crypto.dart';
import 'package:web3dart/web3dart.dart';
void main() {
runApp(const MainApp());
}
class MainApp extends StatelessWidget {
const MainApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: HomeView(),
);
}
}
class HomeView extends StatefulWidget {
const HomeView({super.key});
@override
State<HomeView> createState() => _HomeViewState();
}
class _HomeViewState extends State<HomeView> with WidgetsBindingObserver {
static const projectId = '45caf086591c46efb6e9f19b6104d7e8';
static const _exampleMessage =
'0x4d7920656d61696c206973206a6f686e40646f652e636f6d202d2031363533333933373535313531';
final _walletConnectV2Plugin = WalletConnectV2();
final _walletMetadata = AppMetadata(
name: 'Flutter Wallet',
url: 'https://avacus.cc',
description: 'Flutter Wallet by Avacus',
icons: ['https://avacus.cc/apple-icon-180x180.png'],
redirect: 'wcexample');
final _uriController = TextEditingController();
final List<Session> _sessions = [];
late String _privateKey;
late String _address;
String? _dappTopic;
String? _tempDappTopic;
String? _uriDisplay;
bool _isLoading = false;
bool _isInitiated = false;
bool _isForeground = true;
@override
void initState() {
WidgetsBinding.instance.addObserver(this);
super.initState();
_walletConnectV2Plugin.onConnectionStatus = (isConnected) async {
debugPrint('---: CONNECTED: $isConnected');
if (_isInitiated) {
if (!isConnected && _isForeground) {
_walletConnectV2Plugin.connect();
}
} else {
if (isConnected) {
setState(() {
_isLoading = false;
_isInitiated = true;
});
_refreshSessions();
} else {
setState(() {
_isLoading = false;
});
}
}
};
_walletConnectV2Plugin.onSessionProposal = (proposal) async {
setState(() {
_isLoading = false;
});
if (proposal.namespaces.length != 1 ||
!proposal.namespaces.containsKey('eip155') ||
int.parse(
proposal.namespaces['eip155']!.chains.first.split(':')[1]) !=
5) {
_showDialog(
child: const Text('Please choose GOERLI testnet only to do test!'));
_walletConnectV2Plugin.rejectSession(proposalId: proposal.id);
return;
}
final isApprove = await _showDialog(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
const Text('Session Proposal'),
const SizedBox(height: 16),
Text(proposal.toJson().toString()),
const SizedBox(height: 16),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
TextButton(
onPressed: () {
Navigator.of(context).pop(false);
},
child: const Text('Reject')),
TextButton(
onPressed: () {
Navigator.of(context).pop(true);
},
child: const Text('Approve')),
],
)
],
));
if (isApprove == true) {
try {
_walletConnectV2Plugin.approveSession(
approval: SessionApproval(
id: proposal.id,
namespaces: proposal.namespaces.map((key, value) => MapEntry(
key,
SessionNamespace(
accounts:
value.chains.map((e) => '$e:$_address').toList(),
methods: value.methods,
events: value.events,
extensions: value.extensions)))));
} catch (e) {
_showDialog(child: Text('Approve session error: ${e.toString()}'));
}
} else {
try {
_walletConnectV2Plugin.rejectSession(proposalId: proposal.id);
} catch (e) {
_showDialog(child: Text('Reject session error: ${e.toString()}'));
}
}
};
_walletConnectV2Plugin.onSessionSettle = (session) async {
await _refreshSessions();
if (_tempDappTopic == null) return;
_dappTopic = session.topic;
_tempDappTopic = null;
setState(() {});
_setDappTopic(_dappTopic!);
};
_walletConnectV2Plugin.onSessionRejection = (topic) async {
await _refreshSessions();
if (_tempDappTopic == topic) {
_tempDappTopic = null;
setState(() {});
}
};
_walletConnectV2Plugin.onSessionResponse = (response) async {
_showDialog(
child: Text(
'Message: $_exampleMessage\n\n${response.results is String ? 'Signature' : 'Error'}: ${response.results}'));
};
_walletConnectV2Plugin.onSessionUpdate = (_) {
_refreshSessions();
};
_walletConnectV2Plugin.onSessionDelete = (_) {
_refreshSessions();
};
_walletConnectV2Plugin.onEventError = (code, message) {
_showDialog(child: Text('code: $code | message: $message'));
};
_walletConnectV2Plugin.onSessionRequest = (request) async {
final isApprove = await _showDialog(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
const Text('Session Request'),
const SizedBox(height: 16),
Text(request.toJson().toString()),
const SizedBox(height: 16),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
TextButton(
onPressed: () {
Navigator.of(context).pop(false);
},
child: const Text('Reject')),
TextButton(
onPressed: () {
Navigator.of(context).pop(true);
},
child: const Text('Approve')),
],
)
],
));
if (isApprove) {
switch (request.method) {
case 'eth_sendTransaction':
case 'eth_signTransaction':
try {
final object = request.params.first as Map;
final gasLimit = object['gasLimit'] != null
? BigInt.tryParse(object['gasLimit'])
: null;
final gasPrice = object['gasPrice'] != null
? EtherAmount.fromUnitAndValue(
EtherUnit.wei, object['gasPrice'])
: null;
final value = object['value'] != null
? EtherAmount.fromUnitAndValue(EtherUnit.wei, object['value'])
: null;
final from = object['from'] != null
? EthereumAddress.fromHex(object['from'])
: null;
final to = object['to'] != null
? EthereumAddress.fromHex(object['to'])
: null;
final data =
object['data'] != null ? hexToBytes(object['data']) : null;
final tx = Transaction(
from: from,
data: data,
value: value,
maxGas: gasLimit?.toInt(),
to: to,
gasPrice: gasPrice,
);
final client =
Web3Client('https://rpc.ankr.com/eth_goerli', Client());
final signature = await client.signTransaction(
EthPrivateKey.fromHex(_privateKey), tx);
await _walletConnectV2Plugin.approveRequest(
topic: request.topic,
requestId: request.id,
result: bytesToHex(signature, include0x: true));
} catch (e) {
_showDialog(child: Text('Sign error: ${e.toString()}'));
}
break;
case 'personal_sign':
case 'eth_sign':
try {
final message =
request.params.firstWhere((element) => element != _address);
final signature = EthSigUtil.signPersonalMessage(
message: hexToBytes(message), privateKey: _privateKey);
await _walletConnectV2Plugin.approveRequest(
topic: request.topic,
requestId: request.id,
result: signature);
} catch (e) {
_showDialog(child: Text('Approve error: ${e.toString()}'));
}
break;
case 'eth_signTypedData':
try {
final message =
request.params.firstWhere((element) => element != _address);
final jsonData = message is Map ? jsonEncode(message) : message;
final signature = EthSigUtil.signTypedData(
jsonData: jsonData.toString(),
privateKey: _privateKey,
version: TypedDataVersion.V4);
await _walletConnectV2Plugin.approveRequest(
topic: request.topic,
requestId: request.id,
result: signature);
} catch (e) {
_showDialog(
child: Text('Approve request error: ${e.toString()}'));
}
break;
default:
_showDialog(child: Text('Unhandled method ${request.method}'));
break;
}
} else {
try {
await _walletConnectV2Plugin.rejectRequest(
topic: request.topic, requestId: request.id);
} catch (e) {
_showDialog(child: Text('Reject request error: ${e.toString()}'));
}
}
};
}
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
appBar: AppBar(
title: const Text('Wallet Connect Flutter V2'),
),
body: SafeArea(
child: Center(
child: _isLoading
? const CupertinoActivityIndicator()
: _isInitiated
? _tempDappTopic != null
? Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Text('URI: $_uriDisplay'),
const SizedBox(height: 16),
TextButton(
onPressed: () {
Clipboard.setData(
ClipboardData(text: _uriDisplay));
},
child: const Text('Copy')),
TextButton(
onPressed: () {
setState(() {
_tempDappTopic = null;
});
},
child: const Text('Back'))
],
),
)
: Padding(
padding: const EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
_dappTopic == null
? TextButton(
child: const Text(
'Create Pair for Ethereum Mainnet'),
onPressed: () async {
final uri = await _walletConnectV2Plugin
.createPair(namespaces: {
'eip155': ProposalNamespace(chains: [
'eip155:1'
], methods: [
"eth_signTransaction",
"eth_sendTransaction",
"personal_sign",
"eth_signTypedData"
], events: [])
});
if (uri == null) return;
_uriDisplay = uri;
_tempDappTopic =
uri.split('@')[0].split(':')[1];
setState(() {});
})
: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text('Topic: $_dappTopic'),
Wrap(
children: [
TextButton(
child:
const Text('personal_sign'),
onPressed: () =>
onSendPersonalMessageTest()),
TextButton(
child: const Text(
'eth_signTransaction'),
onPressed: () =>
onSendTransactionTest()),
TextButton(
child: const Text('Disconnect'),
onPressed: () async {
await _walletConnectV2Plugin
.disconnectSession(
topic: _dappTopic!);
_refreshSessions();
})
],
),
],
),
Container(
width: double.infinity,
height: 1,
color: Colors.grey,
margin:
const EdgeInsets.symmetric(vertical: 16)),
const Text('Sessions:'),
Expanded(
child: _sessions.isEmpty
? const Center(
child: Text(
'No sessions\n\nPair wallet connect uri and approve to have session',
textAlign: TextAlign.center))
: ListView.separated(
padding: const EdgeInsets.symmetric(
vertical: 16),
itemBuilder: (_, index) {
final session = _sessions[index];
return Container(
padding: const EdgeInsets.all(16),
decoration: BoxDecoration(
borderRadius:
BorderRadius.circular(12),
border: Border.all(
width: 1,
color: Colors.grey)),
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Text(session
.toJson()
.toString()),
TextButton(
onPressed: () async {
await _walletConnectV2Plugin
.disconnectSession(
topic: session
.topic);
_refreshSessions();
},
child: const Text(
'Disconnect'))
],
),
);
},
separatorBuilder: (_, __) =>
const SizedBox(height: 16),
itemCount: _sessions.length)),
Container(
width: double.infinity,
height: 1,
color: Colors.grey,
margin:
const EdgeInsets.symmetric(vertical: 16)),
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text('Account:'),
const SizedBox(height: 8),
Text('Private Key: $_privateKey'),
const SizedBox(height: 8),
Text('Address: $_address'),
const SizedBox(height: 8),
const Text(
'PLEASE CHOOSE GOERLI NETWORK ONLY TO PAIR!',
style:
TextStyle(color: Colors.redAccent)),
const SizedBox(height: 8),
Container(
padding: const EdgeInsets.symmetric(
horizontal: 16),
width: double.infinity,
height: 56,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(12),
border: Border.all(
width: 1, color: Colors.grey)),
child: TextFormField(
controller: _uriController,
maxLines: 1,
maxLength: 512,
cursorWidth: 2,
cursorColor: Colors.grey,
decoration: const InputDecoration(
border: InputBorder.none,
hintText:
"Enter wallet connect URI",
counterText: '')),
),
const SizedBox(height: 8),
Row(
mainAxisAlignment:
MainAxisAlignment.spaceEvenly,
children: [
TextButton(
onPressed: () {
Clipboard.getData('text/plain')
.then((data) {
if (data?.text == null) return;
_uriController.text = data!.text!;
});
},
child: const Text('Paste')),
TextButton(
onPressed: () async {
try {
setState(() {
_isLoading = true;
});
final uri = _uriController.text;
if (uri.trim().isEmpty) {
_showDialog(
child: const Text(
'Please paste the WalletConnect V2 URI then do Pair'));
return;
}
_uriController.clear();
await _walletConnectV2Plugin.pair(
uri: uri);
} catch (e) {
_showDialog(
child: Text(
'Pair error: ${e.toString()}'));
} finally {
setState(() {
_isLoading = false;
});
}
},
child: const Text('Pair'))
],
)
],
),
],
),
)
: TextButton(
onPressed: () async {
setState(() {
_isLoading = true;
});
await _initDapp();
await _initWallet();
await _walletConnectV2Plugin.init(
projectId: projectId, appMetadata: _walletMetadata);
await _walletConnectV2Plugin.connect();
},
child: const Text('Init WalletConnect')),
),
),
);
}
void onSendPersonalMessageTest() async {
final session =
_sessions.firstWhere((element) => element.topic == _dappTopic!);
await _walletConnectV2Plugin.sendRequest(
request: Request(
method: 'personal_sign',
chainId: 'eip155:1',
topic: _dappTopic!,
params: [
_exampleMessage,
session.namespaces['eip155']!.accounts.first.split(':').last
]));
// TODO: don't forget to check if where is the source come from to determine launch or not
session.peer.redirect?.launch();
}
void onSendTransactionTest() async {
final session =
_sessions.firstWhere((element) => element.topic == _dappTopic!);
await _walletConnectV2Plugin.sendRequest(
request: Request(
method: 'eth_signTransaction',
chainId: 'eip155:1',
topic: _dappTopic!,
params: [
{
"from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
"to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
"gas": "0x76c0", // 30400
"gasPrice": "0x9184e72a000", // 10000000000000
"value": "0x9184e72a", // 2441406250
"data":
"0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
}
]));
// TODO: don't forget to check if where is the source come from to determine launch or not
session.peer.redirect?.launch();
}
Future _refreshSessions() async {
try {
final sessions = await _walletConnectV2Plugin.getActivatedSessions();
if (sessions
.where((element) => element.topic == _dappTopic)
.toList()
.isEmpty) {
_setDappTopic(_dappTopic = null);
}
_sessions.clear();
_sessions.addAll(sessions);
setState(() {});
} catch (e) {
_showDialog(child: Text('Refresh sessions error: ${e.toString()}'));
}
}
Future _showDialog({required Widget child}) {
return showDialog(
context: context,
builder: (context) {
return Dialog(
insetPadding: const EdgeInsets.symmetric(horizontal: 16),
backgroundColor: Colors.transparent,
child: Card(
clipBehavior: Clip.antiAlias,
color: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(12)),
child: Container(
padding: const EdgeInsets.all(16),
child: child,
),
),
);
});
}
Future _initWallet() async {
final sp = await SharedPreferences.getInstance();
final mnemonic = sp.getString('mnemonic') ?? bip39.generateMnemonic();
if (!sp.containsKey('mnemonic')) {
await sp.setString('mnemonic', mnemonic);
}
final seed = bip39.mnemonicToSeed(mnemonic);
final wallet = bip32.BIP32.fromSeed(seed);
final pathWallet = wallet.derivePath('''m/44'/60'/0'/0/0''');
_privateKey = HEX.encode(pathWallet.privateKey!);
final private = EthPrivateKey.fromHex(_privateKey);
_address = (await private.extractAddress()).hexEip55;
}
Future _initDapp() async {
final sp = await SharedPreferences.getInstance();
_dappTopic = sp.getString('dapp_topic');
}
Future _setDappTopic(String? topic) async {
final sp = await SharedPreferences.getInstance();
if (topic != null) {
return sp.setString('dapp_topic', topic);
}
return sp.remove('dapp_topic');
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
super.didChangeAppLifecycleState(state);
switch (state) {
case AppLifecycleState.resumed:
_isForeground = true;
debugPrint('---: DO CONNECT');
if (_isInitiated) {
_walletConnectV2Plugin.connect();
}
break;
case AppLifecycleState.paused:
_isForeground = false;
debugPrint('---: DO DISCONNECT');
if (_isInitiated) {
_walletConnectV2Plugin.disconnect();
}
break;
default:
break;
}
}
@override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
_walletConnectV2Plugin.dispose();
super.dispose();
}
}
extension StringExt on String {
Future launch({int delayInMillis = 500}) async {
try {
await Future.delayed(Duration(milliseconds: delayInMillis));
final uri = Uri.parse(contains(':') ? this : '$this:');
if (startsWith('http')) {
await _launchUniversalLink(uri);
} else {
await launchUrl(uri);
}
} catch (_) {}
}
Future _launchUniversalLink(Uri url) async {
try {
final bool nativeAppLaunchSucceeded = await launchUrl(
url,
mode: LaunchMode.externalNonBrowserApplication,
);
if (!nativeAppLaunchSucceeded) {
return await launchUrl(
url,
mode: LaunchMode.inAppWebView,
);
}
} catch (_) {}
}
}Metadata
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Publisher
unverified uploader
Weekly Downloads
Metadata
Wallet Connect V2 for Flutter, available for both Wallet and DApp to interact easier
Homepage
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
flutter, json_annotation, plugin_platform_interface
