hermez_sdk 1.0.0+3 
hermez_sdk: ^1.0.0+3 copied to clipboard
Published 3 years ago • 
hermez.io
hermez.ioHermez Flutter SDK (https://hermez.io). This plugin provides a cross-platform tool (iOS, Android) to communicate with the Hermez Network.
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:hermez_sdk/api.dart' as coordinatorApi;
import 'package:hermez_sdk/hermez_compressed_amount.dart';
import 'package:hermez_sdk/hermez_sdk.dart';
import 'package:hermez_sdk/hermez_wallet.dart';
import 'package:hermez_sdk/model/token.dart';
import 'package:hermez_sdk/model/tokens_response.dart';
import 'package:hermez_sdk/tx.dart' as tx;
import 'package:hermez_sdk/utils.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
String _response = '(please, wait)';
/*static const EXAMPLES_WEB3_CHAIN_ID = 4;
static const EXAMPLES_WEB3_URL = 'https://rinkeby.infura.io/v3/';
static const EXAMPLES_WEB3_RDP_URL = 'wss://rinkeby.infura.io/v3/';*/
static const EXAMPLES_WEB3_API_KEY = 'e2d8687b60b944d58adc96485cbab18c';
/*static const EXAMPLES_HERMEZ_API_URL = 'https://api.testnet.hermez.io';
static const EXAMPLES_HERMEZ_EXPLORER_URL =
'https://explorer.testnet.hermez.io';
static const EXAMPLES_HERMEZ_CONTRACT_ADDRESS =
'0x679b11E0229959C1D3D27C9d20529E4C5DF7997c';
static const EXAMPLES_HERMEZ_WDELAYER_ADDRESS =
'0xeFD96CFBaF1B0Dd24d3882B0D6b8D95F85634724';*/
static const EXAMPLES_PRIVATE_KEY1 =
'0x21a5e7321d0e2f3ca1cc6504396e6594a2211544b08c206847cdee96f832421a';
static const EXAMPLES_PRIVATE_KEY2 =
'0x3a9270c05ac169097808da4b02e8f9146be0f8a38cfad3dcfc0b398076381fdd';
static const EXAMPLES_PRIVATE_KEY3 =
'0x3d228fed4dc371f56b8f82f66ff17cd6bf1da7806d7eabb21810313dee819a53';
@override
void initState() {
super.initState();
initPlatformState();
//getHermezSupportedTokens();
//createHermezWallets();
//moveTokensFromEthereumToHermez();
//getTokenBalance();
//moveTokensFromHermezToEthereumStep1Exit();
//moveTokensFromHermezToEthereumStep1ForceExit();
//moveTokensFromHermezToEthereumStep2Withdraw();
//createAccountAuthorization();
//createInternalAccount();
}
void initPlatformState() {
HermezSDK.init("rinkeby", web3ApiKey: EXAMPLES_WEB3_API_KEY);
/*
// customized init
HermezSDK.init(
'custom',
envParams: EnvParams(
EXAMPLES_WEB3_CHAIN_ID,
{
ContractName.hermez: EXAMPLES_HERMEZ_ROLLUP_ADDRESS, // Hermez
ContractName.withdrawalDelayer:
EXAMPLES_HERMEZ_WDELAYER_ADDRESS, // WithdrawalDeFlayer
},
EXAMPLES_HERMEZ_API_URL,
EXAMPLES_HERMEZ_EXPLORER_URL,
EXAMPLES_WEB3_URL + EXAMPLES_WEB3_API_KEY,
EXAMPLES_WEB3_RDP_URL + EXAMPLES_WEB3_API_KEY),
);*/
}
void getHermezSupportedTokens() async {
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
setState(() {
_response = tokenERC20.toJson().toString();
});
}
void createHermezWallets() async {
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
//final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
// load second account
final wallet2 =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY2);
//final HermezWallet hermezWallet2 = wallet2[0];
final String hermezEthereumAddress2 = wallet2[1];
setState(() {
_response = 'hermez ethereum address 1: ' +
hermezEthereumAddress +
'\n'
'Hermez ethereum address 2: ' +
hermezEthereumAddress2;
});
}
void moveTokensFromEthereumToHermez() async {
await Future.delayed(Duration(seconds: 2));
// load ethereum token
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
// set amount to transfer
final amount = 0.0001;
final amountDeposit = getTokenAmountBigInt(amount, tokenERC20.decimals);
final compressedDepositAmount =
HermezCompressedAmount.compressAmount(amountDeposit.toDouble());
// perform deposit account 1
String txHash = await tx.deposit(
compressedDepositAmount,
hermezEthereumAddress,
tokenERC20,
hermezWallet.publicKeyCompressedHex,
EXAMPLES_PRIVATE_KEY1);
setState(() {
_response = txHash;
});
}
void getTokenBalance() async {
// load ethereum token
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
//final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
// load second account
final wallet2 =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY2);
//final HermezWallet hermezWallet2 = wallet2[0];
final String hermezEthereumAddress2 = wallet2[1];
// get sender account information
final accountSenderResponse = await coordinatorApi
.getAccounts(hermezEthereumAddress, [tokenERC20.id]);
final infoAccountSender = accountSenderResponse.accounts.length > 0
? accountSenderResponse.accounts[0]
: null;
// get receiver account information
final accountReceiverResponse = await coordinatorApi
.getAccounts(hermezEthereumAddress2, [tokenERC20.id]);
final infoAccountReceiver = accountReceiverResponse.accounts.length > 0
? accountReceiverResponse.accounts[0]
: null;
if (infoAccountSender != null) {
//final account1ByIdx =
// coordinatorApi.getAccount(infoAccountSender.accountIndex);
}
if (infoAccountReceiver != null) {
//final account2ByIdx =
// coordinatorApi.getAccount(infoAccountReceiver.accountIndex);
}
setState(() {
_response = 'account 1 balance: ' +
(infoAccountSender != null ? infoAccountSender.balance : '0') +
'\n'
'account 2 balance: ' +
(infoAccountReceiver != null ? infoAccountReceiver.balance : '0');
});
}
void moveTokensFromHermezToEthereumStep1Exit() async {
// load ethereum token
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
// get sender account information
final accountSenderResponse = await coordinatorApi
.getAccounts(hermezEthereumAddress, [tokenERC20.id]);
final infoAccountSender = accountSenderResponse.accounts.length > 0
? accountSenderResponse.accounts[0]
: null;
// set amount to exit
final amount = 0.0001;
final amountExit = getTokenAmountBigInt(amount, tokenERC20.decimals);
final compressedExitAmount =
HermezCompressedAmount.compressAmount(amountExit.toDouble());
// set fee in transaction
final state = await coordinatorApi.getState();
final userFee = state.recommendedFee.existingAccount;
// generate L2 transaction
final l2ExitTx = {
'type': 'Exit',
'from': infoAccountSender.accountIndex,
'amount': compressedExitAmount,
'fee': userFee
};
final exitResponse = await tx.generateAndSendL2Tx(
l2ExitTx, hermezWallet, infoAccountSender.token);
//final txExitPool =
// await coordinatorApi.getPoolTransaction(exitResponse['id']);
//final txExitConf =
// await coordinatorApi.getHistoryTransaction(txExitPool.id);
setState(() {
_response = exitResponse.toString();
});
}
void moveTokensFromHermezToEthereumStep1ForceExit() async {
// load ethereum token
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
//final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
// get sender account information
final accountSenderResponse = await coordinatorApi
.getAccounts(hermezEthereumAddress, [tokenERC20.id]);
final infoAccountSender = accountSenderResponse.accounts.length > 0
? accountSenderResponse.accounts[0]
: null;
// set amount to force exit
final amount = 0.0001;
final amountForceExit = getTokenAmountBigInt(amount, tokenERC20.decimals);
final compressedForceExitAmount =
HermezCompressedAmount.compressAmount(amountForceExit.toDouble());
String txHash = await tx.forceExit(compressedForceExitAmount,
infoAccountSender.accountIndex, tokenERC20, EXAMPLES_PRIVATE_KEY1);
setState(() {
_response = txHash;
});
}
void moveTokensFromHermezToEthereumStep2Withdraw() async {
// load ethereum token
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
final exitInfoN = (await coordinatorApi.getExits(
hermezEthereumAddress, true, tokenERC20.id))
.exits;
if (exitInfoN != null && exitInfoN.length > 0) {
final exitInfo = exitInfoN.last;
// set to perform instant withdraw
final isInstant = true;
String txHash = await tx.withdraw(
double.parse(exitInfo.balance),
exitInfo.accountIndex,
exitInfo.token,
hermezWallet.publicKeyCompressedHex,
exitInfo.batchNum,
exitInfo.merkleProof.siblings,
EXAMPLES_PRIVATE_KEY1,
isInstant: isInstant);
setState(() {
_response = txHash;
});
}
}
void createAccountAuthorization() async {
// load ethereum token
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
// get sender account information
final accountSenderResponse = await coordinatorApi
.getAccounts(hermezEthereumAddress, [tokenERC20.id]);
final infoAccountSender = accountSenderResponse.accounts.length > 0
? accountSenderResponse.accounts[0]
: null;
// load third account
final wallet3 =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY3);
final HermezWallet hermezWallet3 = wallet3[0];
//final String hermezEthereumAddress3 = wallet3[1];
final signature = await hermezWallet3
.signCreateAccountAuthorization(EXAMPLES_PRIVATE_KEY3);
await coordinatorApi.postCreateAccountAuthorization(
hermezWallet3.hermezEthereumAddress,
hermezWallet3.publicKeyBase64,
signature);
await coordinatorApi
.getCreateAccountAuthorization(hermezWallet3.hermezEthereumAddress);
// set amount to transfer
final amount = 0.0001;
final amountTransfer = getTokenAmountBigInt(amount, tokenERC20.decimals);
final compressedTransferAmount =
HermezCompressedAmount.compressAmount(amountTransfer.toDouble());
// fee computation
final state = await coordinatorApi.getState();
final fees = state.recommendedFee;
final usdTokenExchangeRate = tokenERC20.USD;
final fee = fees.createAccount / usdTokenExchangeRate;
// generate L2 transaction
final l2TransferTx = {
"from": infoAccountSender.accountIndex,
"to": hermezWallet3.hermezEthereumAddress,
"amount": compressedTransferAmount,
"fee": fee
};
final transferResponse = await tx.generateAndSendL2Tx(
l2TransferTx, hermezWallet, infoAccountSender.token);
setState(() {
_response = transferResponse.toString();
});
}
void createInternalAccount() async {
// load ethereum token
TokensResponse tokenResponse = await coordinatorApi.getTokens();
Token tokenERC20 = tokenResponse.tokens[0];
// load first account
final wallet =
await HermezWallet.createWalletFromPrivateKey(EXAMPLES_PRIVATE_KEY1);
//final HermezWallet hermezWallet = wallet[0];
final String hermezEthereumAddress = wallet[1];
// get sender account information
final accountSenderResponse = await coordinatorApi
.getAccounts(hermezEthereumAddress, [tokenERC20.id]);
final infoAccountSender = accountSenderResponse.accounts.length > 0
? accountSenderResponse.accounts[0]
: null;
// Create Internal Account
// create new bjj private key to receive user transactions
final Uint8List pvtBjjKey = Uint8List(32);
pvtBjjKey.fillRange(0, 32, 1);
// create rollup internal account from bjj private key
final wallet4 = await HermezWallet.createWalletFromBjjPvtKey(pvtBjjKey);
final hermezWallet4 = wallet4[0];
// fee computation
final state = await coordinatorApi.getState();
final fees = state.recommendedFee;
final usdTokenExchangeRate = tokenERC20.USD;
final fee = fees.createAccountInternal / usdTokenExchangeRate;
// set amount to transfer
final amount = 0.0001;
final amountTransferInternal =
getTokenAmountBigInt(amount, tokenERC20.decimals);
final compressedTransferInternalAmount =
HermezCompressedAmount.compressAmount(
amountTransferInternal.toDouble());
// generate L2 transaction
final transferToInternal = {
'from': infoAccountSender.accountIndex,
'to': hermezWallet4.publicKeyBase64,
'amount': compressedTransferInternalAmount,
'fee': fee
};
final internalAccountResponse = await tx.generateAndSendL2Tx(
transferToInternal, hermezWallet4, tokenERC20);
setState(() {
_response = internalAccountResponse.toString();
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Hermez SDK Example'),
),
body: Center(
child: Text(
'Response:\n$_response\n',
textAlign: TextAlign.center,
),
),
),
);
}
}Metadata
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Metadata
Hermez Flutter SDK (https://hermez.io). This plugin provides a cross-platform tool (iOS, Android) to communicate with the Hermez Network.
Homepage
Repository (GitHub)
View/report issues
Contributing
Documentation
License
Apache-2.0 (license)
Dependencies
bip39, ffi, flutter, hex, http, provider, shared_preferences, web3dart, web_socket_channel
