How--to-deploy-smart-contracts-on
The following smart contract code is only an example and is NOT to be used in Production systems.
pragma solidity ^0.4.11;
/**
* Math operations with safety checks
*/
library SafeMath {
function mul(uint a, uint b) internal pure returns (uint) {
uint c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint a, uint b) internal pure returns (uint) {
assert(b > 0);
uint c = a / b;
assert(a == b * c + a % b);
return c;
}
function sub(uint a, uint b) internal pure returns (uint) {
assert(b <= a);
return a - b;
}
function add(uint a, uint b) internal pure returns (uint) {
uint c = a + b;
assert(c >= a);
return c;
}
function max64(uint64 a, uint64 b) internal pure returns (uint64) {
return a >= b ? a : b;
}
function min64(uint64 a, uint64 b) internal pure returns (uint64) {
return a < b ? a : b;
}
function max256(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
function min256(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
}
contract ERC20Protocol {
/* This is a slight change to the ERC20 base standard.
function totalSupply() constant returns (uint supply);
is replaced with:
uint public totalSupply;
This automatically creates a getter function for the totalSupply.
This is moved to the base contract since public getter functions are not
currently recognised as an implementation of the matching abstract
function by the compiler.
*/
/// total amount of tokens
uint public totalSupply;
/// @param _owner The address from which the balance will be retrieved
/// @return The balance
function balanceOf(address _owner) public constant returns (uint balance);
/// @notice send `_value` token to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transfer(address _to, uint _value) public returns (bool success);
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
/// @param _from The address of the sender
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transferFrom(address _from, address _to, uint _value) public returns (bool success);
///if you want to use privacy transaction,you need to implement this function in your contract
/// @notice send `_value` token to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _toKey the ota pubkey
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function otatransfer(address _to, bytes _toKey, uint256 _value) public returns (string);
///check privacy transaction
/// @param _owner The address from which the ota balance will be retrieved
/// @return The balance
function otabalanceOf(address _owner) public constant returns (uint256 balance);
/// @notice `msg.sender` approves `_spender` to spend `_value` tokens
/// @param _spender The address of the account able to transfer the tokens
/// @param _value The amount of tokens to be approved for transfer
/// @return Whether the approval was successful or not
function approve(address _spender, uint _value) public returns (bool success);
/// @param _owner The address of the account owning tokens
/// @param _spender The address of the account able to transfer the tokens
/// @return Amount of remaining tokens allowed to spent
function allowance(address _owner, address _spender) public constant returns (uint remaining);
event Transfer(address indexed _from, address indexed _to, uint _value);
event Approval(address indexed _owner, address indexed _spender, uint _value);
}
//the contract implements ERC20Protocol interface with privacy transaction
contract StandardToken is ERC20Protocol {
using SafeMath for uint;
string public constant name = "WanToken-Beta";
string public constant symbol = "WanToken";
uint public constant decimals = 18;
function transfer(address _to, uint _value) public returns (bool success) {
if (balances[msg.sender] >= _value) {
balances[msg.sender] -= _value;
balances[_to] += _value;
Transfer(msg.sender, _to, _value);
return true;
} else { return false; }
}
function transferFrom(address _from, address _to, uint _value) public returns (bool success) {
if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value) {
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
} else { return false; }
}
function balanceOf(address _owner) public constant returns (uint balance) {
return balances[_owner];
}
function approve(address _spender, uint _value) public returns (bool success) {
assert((_value == 0) || (allowed[msg.sender][_spender] == 0));
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public constant returns (uint remaining) {
return allowed[_owner][_spender];
}
////////////////////////////////////////////////////////////////////////
mapping (address => uint) balances;
mapping (address => mapping (address => uint)) allowed;
// privacy balance, bytes for public key
mapping (address => uint256) public privacyBalance;
mapping (address => bytes) public otaKey;
//this only for initialize, only for test to mint token to one wan address
function initPrivacyAsset(address initialBase, bytes baseKeyBytes, uint256 value) public {
privacyBalance[initialBase] = value;
otaKey[initialBase] = baseKeyBytes;
}
// return string just for debug
function otatransfer(address _to, bytes _toKey, uint256 _value) public returns (string) {
if(privacyBalance[msg.sender] < _value) return "sender token too low";
privacyBalance[msg.sender] -= _value;
privacyBalance[_to] += _value;
otaKey[_to] = _toKey;
return "success";
}
//check privacy balance
function otabalanceOf(address _owner) public view returns (uint256 balance) {
return privacyBalance[_owner];
}
Note:
- Privacy transaction function is "otatransfer" in the ERC20 Protocol, the contract with privacy transaction need to implement ERC20 Protocol
- Privacy balance is stored in the map privacyBalance, function otabalanceOf can get this balance
How to compile and deploy:
Requirement:
1: a working Wanchain client, go to the github site, https://github.com/wanchain/go-wanchain, to get the latest version
2: remix https://remix.ethereum.org, which is an amazing online smart contract development IDE
3: your awesome Dapp consists of one or multiple smart contracts
Steps:
1: go to remix, copy and paste your smart contract code, make static syntax analysis, and compile it
2: click Details on the right panel of remix, copy all the code of WEB3DEPLOY section from the pop-up
3: copy the script and run it in gwan console
var erc20simple_contract = web3.eth.contract([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_toKey","type":"bytes"},{"name":"_value","type":"uint256"}],"name":"otatransfer","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"privacyBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"initialBase","type":"address"},{"name":"baseKeyBytes","type":"bytes"},{"name":"value","type":"uint256"}],"name":"initPrivacyAsset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"otabalanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"otaKey","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}]);
var erc20simple = erc20simple_contract.new(
{
from: web3.eth.accounts[1],
data: '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gas: '4700000'
}, function (e, contract){
console.log(e, contract);
if (typeof contract.address !== 'undefined') {
console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
}
})
4: the transaction id and contract address (hash values starting with '0x') will be printed out onto the console after few seconds
5: now, you can play with your Dapp
Note:
You can locate a demo WANCHAIN token contract and involved scripts under contracts/demo/ directory
How to invoke privacy transfer
After deployed above token contract on WANCHAIN,in the WANCHAIN console,you can invoke token privacy transaction according to following process:
Suppose there are at lease 3 accounts in your WANCHAIN node
- Define asset function and variable
var initPriBalance = 10000;
var priTranValue = 888;
var wanBalance = function(addr){
return web3.fromWin(web3.eth.getBalance(addr));
}
var wanUnlock = function(addr){
return personal.unlockAccount(addr,"wanglu",99999);
}
var sendWanFromUnlock = function (From, To , V){
eth.sendTransaction({from:From, to: To, value: web3.toWin(V)});
}
var wait = function (conditionFunc) {
var loopLimit = 130;
var loopTimes = 0;
while (!conditionFunc()) {
admin.sleep(2);
loopTimes++;
if(loopTimes>=loopLimit){
throw Error("wait timeout! conditionFunc:" + conditionFunc)
}
}
}
wanUnlock(eth.accounts[1])
wanUnlock(eth.accounts[2])
stampBalance = 0.09;
- buy stamp for token privacy transaction
abiDefStamp = [{"constant":false,"type":"function","stateMutability":"nonpayable","inputs":[{"name":"OtaAddr","type":"string"},{"name":"Value","type":"uint256"}],"name":"buyStamp","outputs":[{"name":"OtaAddr","type":"string"},{"name":"Value","type":"uint256"}]},{"constant":false,"type":"function","inputs":[{"name":"RingSignedData","type":"string"},{"name":"Value","type":"uint256"}],"name":"refundCoin","outputs":[{"name":"RingSignedData","type":"string"},{"name":"Value","type":"uint256"}]},{"constant":false,"type":"function","stateMutability":"nonpayable","inputs":[],"name":"getCoins","outputs":[{"name":"Value","type":"uint256"}]}];
contractDef = eth.contract(abiDefStamp);
stampContractAddr = "0x00000000000000000000000000000000000000c8";
stampContract = contractDef.at(stampContractAddr);
var wanAddr = wan.getWanAddress(eth.accounts[1]);
var otaAddrStamp = wan.generateOneTimeAddress(wanAddr);
txBuyData = stampContract.buyStamp.getData(otaAddrStamp, web3.toWin(stampBalance));
sendTx = eth.sendTransaction({from:eth.accounts[1], to:stampContractAddr, value:web3.toWin(stampBalance), data:txBuyData, gas: 1000000});
wait(function(){return eth.getTransaction(sendTx).blockNumber != null;});
keyPairs = wan.computeOTAPPKeys(eth.accounts[1], otaAddrStamp).split('+');
privateKeyStamp = keyPairs[0];
- get stamp mix set for ring sign
var mixStampAddresses = wan.getOTAMixSet(otaAddrStamp,2);
var mixSetWith0x = []
for (i = 0; i < mixStampAddresses.length; i++){
mixSetWith0x.push(mixStampAddresses[i])
}
- define token contract ABI
var erc20simple_contract = web3.eth.contract([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_toKey","type":"bytes"},{"name":"_value","type":"uint256"}],"name":"otatransfer","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"privacyBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"initialBase","type":"address"},{"name":"baseKeyBytes","type":"bytes"},{"name":"value","type":"uint256"}],"name":"initPrivacyAsset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"otabalanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"otaKey","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}]);
contractAddr = '0xa2e526a3632d225f15aa0592e00bed31a48c953d';
//this address should changed according to your contract deploy
erc20simple = erc20simple_contract.at(contractAddr)
- create one time address for account1
var wanAddr = wan.getWanAddress(eth.accounts[1]);
var otaAddrTokenHolder = wan.generateOneTimeAddress(wanAddr);
keyPairs = wan.computeOTAPPKeys(eth.accounts[1], otaAddrTokenHolder).split('+');
privateKeyTokenHolder = keyPairs[0];
addrTokenHolder = keyPairs[2];
sendTx = erc20simple.initPrivacyAsset.sendTransaction(addrTokenHolder, otaAddrTokenHolder, '0x' + initPriBalance.toString(16), {from:eth.accounts[1], gas:1000000});
wait(function(){return eth.getTransaction(sendTx).blockNumber != null;});
ota1Balance = erc20simple.privacyBalance(addrTokenHolder)
if (ota1Balance != initPriBalance) {
throw Error('ota1 balance wrong! balance:' + ota1Balance + ', except:' + initPriBalance)
}
- generate ring sign data
var hashMsg = addrTokenHolder
var ringSignData = personal.genRingSignData(hashMsg, privateKeyStamp, mixSetWith0x.join("+"))
- create one time address for account2
var wanAddr = wan.getWanAddress(eth.accounts[2]);
var otaAddr4Account2 = wan.generateOneTimeAddress(wanAddr);
keyPairs = wan.computeOTAPPKeys(eth.accounts[2], otaAddr4Account2).split('+');
privateKeyOtaAcc2 = keyPairs[0];
addrOTAAcc2 = keyPairs[2];
- generate token privacy transfer data
cxtInterfaceCallData = erc20simple.otatransfer.getData(addrOTAAcc2, otaAddr4Account2, priTranValue);
``
9. generate call token privacy transfer data
``C++
glueContractDef = eth.contract([{"constant":false,"type":"function","inputs":[{"name":"RingSignedData","type":"string"},{"name":"CxtCallParams","type":"bytes"}],"name":"combine","outputs":[{"name":"RingSignedData","type":"string"},{"name":"CxtCallParams","type":"bytes"}]}]);
glueContract = glueContractDef.at("0x0000000000000000000000000000000000000000")
combinedData = glueContract.combine.getData(ringSignData, cxtInterfaceCallData)
10.send privacy transaction
sendTx = personal.sendPrivacyCxtTransaction({from:addrTokenHolder, to:contractAddr, value:0, data: combinedData, gasprice:'0x' + (200000000000).toString(16)}, privateKeyTokenHolder)
wait(function(){return eth.getTransaction(sendTx).blockNumber != null;});
- check balance
ota2Balance = erc20simple.privacyBalance(addrOTAAcc2)
if (ota2Balance != priTranValue) {
throw Error("ota2 balance wrong. balance:" + ota2Balance + ", expect:" + priTranValue)
}
ota1Balance = erc20simple.privacyBalance(addrTokenHolder)
if (ota1Balance != initPriBalance - priTranValue) {
throw Error("ota2 balance wrong. balance:" + ota1Balance + ", expect:" + (initPriBalance - priTranValue))
}
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