pragma solidity 0.4.18;
// File: contracts/ERC20Interface.sol
// https://github.com/ethereum/EIPs/issues/20
interface ERC20 {
function totalSupply() public view returns (uint supply);
function balanceOf(address _owner) public view returns (uint balance);
function transfer(address _to, uint _value) public returns (bool success);
function transferFrom(address _from, address _to, uint _value) public returns (bool success);
function approve(address _spender, uint _value) public returns (bool success);
function allowance(address _owner, address _spender) public view returns (uint remaining);
function decimals() public view returns(uint digits);
event Approval(address indexed _owner, address indexed _spender, uint _value);
}
// File: contracts/FeeBurnerInterface.sol
interface FeeBurnerInterface {
function handleFees (uint tradeWeiAmount, address reserve, address wallet) public returns(bool);
}
// File: contracts/Utils.sol
/// @title Kyber constants contract
contract Utils {
ERC20 constant internal ETH_TOKEN_ADDRESS = ERC20(0x00eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee);
uint constant internal PRECISION = (10**18);
uint constant internal MAX_QTY = (10**28); // 10B tokens
uint constant internal MAX_RATE = (PRECISION * 10**6); // up to 1M tokens per ETH
uint constant internal MAX_DECIMALS = 18;
uint constant internal ETH_DECIMALS = 18;
mapping(address=>uint) internal decimals;
function setDecimals(ERC20 token) internal {
if (token == ETH_TOKEN_ADDRESS) decimals[token] = ETH_DECIMALS;
else decimals[token] = token.decimals();
}
function getDecimals(ERC20 token) internal view returns(uint) {
if (token == ETH_TOKEN_ADDRESS) return ETH_DECIMALS; // save storage access
uint tokenDecimals = decimals[token];
// technically, there might be token with decimals 0
// moreover, very possible that old tokens have decimals 0
// these tokens will just have higher gas fees.
if(tokenDecimals == 0) return token.decimals();
return tokenDecimals;
}
function calcDstQty(uint srcQty, uint srcDecimals, uint dstDecimals, uint rate) internal pure returns(uint) {
require(srcQty <= MAX_QTY);
require(rate <= MAX_RATE);
if (dstDecimals >= srcDecimals) {
require((dstDecimals - srcDecimals) <= MAX_DECIMALS);
return (srcQty * rate * (10**(dstDecimals - srcDecimals))) / PRECISION;
} else {
require((srcDecimals - dstDecimals) <= MAX_DECIMALS);
return (srcQty * rate) / (PRECISION * (10**(srcDecimals - dstDecimals)));
}
}
function calcSrcQty(uint dstQty, uint srcDecimals, uint dstDecimals, uint rate) internal pure returns(uint) {
require(dstQty <= MAX_QTY);
require(rate <= MAX_RATE);
//source quantity is rounded up. to avoid dest quantity being too low.
uint numerator;
uint denominator;
if (srcDecimals >= dstDecimals) {
require((srcDecimals - dstDecimals) <= MAX_DECIMALS);
numerator = (PRECISION * dstQty * (10**(srcDecimals - dstDecimals)));
denominator = rate;
} else {
require((dstDecimals - srcDecimals) <= MAX_DECIMALS);
numerator = (PRECISION * dstQty);
denominator = (rate * (10**(dstDecimals - srcDecimals)));
}
return (numerator + denominator - 1) / denominator; //avoid rounding down errors
}
}
// File: contracts/PermissionGroups.sol
contract PermissionGroups {
address public admin;
address public pendingAdmin;
mapping(address=>bool) internal operators;
mapping(address=>bool) internal alerters;
address[] internal operatorsGroup;
address[] internal alertersGroup;
uint constant internal MAX_GROUP_SIZE = 50;
function PermissionGroups() public {
admin = msg.sender;
}
modifier onlyAdmin() {
require(msg.sender == admin);
_;
}
modifier onlyOperator() {
require(operators[msg.sender]);
_;
}
modifier onlyAlerter() {
require(alerters[msg.sender]);
_;
}
function getOperators () external view returns(address[]) {
return operatorsGroup;
}
function getAlerters () external view returns(address[]) {
return alertersGroup;
}
event TransferAdminPending(address pendingAdmin);
/**
* @dev Allows the current admin to set the pendingAdmin address.
* @param newAdmin The address to transfer ownership to.
*/
function transferAdmin(address newAdmin) public onlyAdmin {
require(newAdmin != address(0));
TransferAdminPending(pendingAdmin);
pendingAdmin = newAdmin;
}
/**
* @dev Allows the current admin to set the admin in one tx. Useful initial deployment.
* @param newAdmin The address to transfer ownership to.
*/
function transferAdminQuickly(address newAdmin) public onlyAdmin {
require(newAdmin != address(0));
TransferAdminPending(newAdmin);
AdminClaimed(newAdmin, admin);
admin = newAdmin;
}
event AdminClaimed( address newAdmin, address previousAdmin);
/**
* @dev Allows the pendingAdmin address to finalize the change admin process.
*/
function claimAdmin() public {
require(pendingAdmin == msg.sender);
AdminClaimed(pendingAdmin, admin);
admin = pendingAdmin;
pendingAdmin = address(0);
}
event AlerterAdded (address newAlerter, bool isAdd);
function addAlerter(address newAlerter) public onlyAdmin {
require(!alerters[newAlerter]); // prevent duplicates.
require(alertersGroup.length < MAX_GROUP_SIZE);
AlerterAdded(newAlerter, true);
alerters[newAlerter] = true;
alertersGroup.push(newAlerter);
}
function removeAlerter (address alerter) public onlyAdmin {
require(alerters[alerter]);
alerters[alerter] = false;
for (uint i = 0; i < alertersGroup.length; ++i) {
if (alertersGroup[i] == alerter) {
alertersGroup[i] = alertersGroup[alertersGroup.length - 1];
alertersGroup.length--;
AlerterAdded(alerter, false);
break;
}
}
}
event OperatorAdded(address newOperator, bool isAdd);
function addOperator(address newOperator) public onlyAdmin {
require(!operators[newOperator]); // prevent duplicates.
require(operatorsGroup.length < MAX_GROUP_SIZE);
OperatorAdded(newOperator, true);
operators[newOperator] = true;
operatorsGroup.push(newOperator);
}
function removeOperator (address operator) public onlyAdmin {
require(operators[operator]);
operators[operator] = false;
for (uint i = 0; i < operatorsGroup.length; ++i) {
if (operatorsGroup[i] == operator) {
operatorsGroup[i] = operatorsGroup[operatorsGroup.length - 1];
operatorsGroup.length -= 1;
OperatorAdded(operator, false);
break;
}
}
}
}
// File: contracts/Withdrawable.sol
/**
* @title Contracts that should be able to recover tokens or ethers
* @author Ilan Doron
* @dev This allows to recover any tokens or Ethers received in a contract.
* This will prevent any accidental loss of tokens.
*/
contract Withdrawable is PermissionGroups {
event TokenWithdraw(ERC20 token, uint amount, address sendTo);
/**
* @dev Withdraw all ERC20 compatible tokens
* @param token ERC20 The address of the token contract
*/
function withdrawToken(ERC20 token, uint amount, address sendTo) external onlyAdmin {
require(token.transfer(sendTo, amount));
TokenWithdraw(token, amount, sendTo);
}
event EtherWithdraw(uint amount, address sendTo);
/**
* @dev Withdraw Ethers
*/
function withdrawEther(uint amount, address sendTo) external onlyAdmin {
sendTo.transfer(amount);
EtherWithdraw(amount, sendTo);
}
}
// File: contracts/FeeBurner.sol
interface BurnableToken {
function transferFrom(address _from, address _to, uint _value) public returns (bool);
function burnFrom(address _from, uint256 _value) public returns (bool);
}
contract FeeBurner is Withdrawable, FeeBurnerInterface, Utils {
mapping(address=>uint) public reserveFeesInBps;
mapping(address=>address) public reserveKNCWallet; //wallet holding knc per reserve. from here burn and send fees.
mapping(address=>uint) public walletFeesInBps; // wallet that is the source of tx is entitled so some fees.
mapping(address=>uint) public reserveFeeToBurn;
mapping(address=>uint) public feePayedPerReserve; // track burned fees and sent wallet fees per reserve.
mapping(address=>mapping(address=>uint)) public reserveFeeToWallet;
address public taxWallet;
uint public taxFeeBps = 0; // burned fees are taxed. % out of burned fees.
BurnableToken public knc;
address public kyberNetwork;
uint public kncPerETHRate = 300;
function FeeBurner(address _admin, BurnableToken kncToken, address _kyberNetwork) public {
require(_admin != address(0));
require(kncToken != address(0));
require(_kyberNetwork != address(0));
kyberNetwork = _kyberNetwork;
admin = _admin;
knc = kncToken;
}
function setReserveData(address reserve, uint feesInBps, address kncWallet) public onlyAdmin {
require(feesInBps < 100); // make sure it is always < 1%
require(kncWallet != address(0));
reserveFeesInBps[reserve] = feesInBps;
reserveKNCWallet[reserve] = kncWallet;
}
function setWalletFees(address wallet, uint feesInBps) public onlyAdmin {
require(feesInBps < 10000); // under 100%
walletFeesInBps[wallet] = feesInBps;
}
function setTaxInBps(uint _taxFeeBps) public onlyAdmin {
require(_taxFeeBps < 10000); // under 100%
taxFeeBps = _taxFeeBps;
}
function setTaxWallet(address _taxWallet) public onlyAdmin {
require(_taxWallet != address(0));
taxWallet = _taxWallet;
}
function setKNCRate(uint rate) public onlyAdmin {
require(rate <= MAX_RATE);
kncPerETHRate = rate;
}
event AssignFeeToWallet(address reserve, address wallet, uint walletFee);
event AssignBurnFees(address reserve, uint burnFee);
function handleFees(uint tradeWeiAmount, address reserve, address wallet) public returns(bool) {
require(msg.sender == kyberNetwork);
require(tradeWeiAmount <= MAX_QTY);
require(kncPerETHRate <= MAX_RATE);
uint kncAmount = tradeWeiAmount * kncPerETHRate;
uint fee = kncAmount * reserveFeesInBps[reserve] / 10000;
uint walletFee = fee * walletFeesInBps[wallet] / 10000;
require(fee >= walletFee);
uint feeToBurn = fee - walletFee;
if (walletFee > 0) {
reserveFeeToWallet[reserve][wallet] += walletFee;
AssignFeeToWallet(reserve, wallet, walletFee);
}
if (feeToBurn > 0) {
AssignBurnFees(reserve, feeToBurn);
reserveFeeToBurn[reserve] += feeToBurn;
}
return true;
}
// this function is callable by anyone
event BurnAssignedFees(address indexed reserve, address sender, uint quantity);
event SendTaxFee(address indexed reserve, address sender, address taxWallet, uint quantity);
function burnReserveFees(address reserve) public {
uint burnAmount = reserveFeeToBurn[reserve];
uint taxToSend = 0;
require(burnAmount > 2);
reserveFeeToBurn[reserve] = 1; // leave 1 twei to avoid spikes in gas fee
if (taxWallet != address(0) && taxFeeBps != 0) {
taxToSend = (burnAmount - 1) * taxFeeBps / 10000;
require(burnAmount - 1 > taxToSend);
burnAmount -= taxToSend;
if (taxToSend > 0) {
require (knc.transferFrom(reserveKNCWallet[reserve], taxWallet, taxToSend));
SendTaxFee(reserve, msg.sender, taxWallet, taxToSend);
}
}
require(knc.burnFrom(reserveKNCWallet[reserve], burnAmount - 1));
//update reserve "payments" so far
feePayedPerReserve[reserve] += (taxToSend + burnAmount - 1);
BurnAssignedFees(reserve, msg.sender, (burnAmount - 1));
}
event SendWalletFees(address indexed wallet, address reserve, address sender);
// this function is callable by anyone
function sendFeeToWallet(address wallet, address reserve) public {
uint feeAmount = reserveFeeToWallet[reserve][wallet];
require(feeAmount > 1);
reserveFeeToWallet[reserve][wallet] = 1; // leave 1 twei to avoid spikes in gas fee
require(knc.transferFrom(reserveKNCWallet[reserve], wallet, feeAmount - 1));
feePayedPerReserve[reserve] += (feeAmount - 1);
SendWalletFees(wallet, reserve, msg.sender);
}
}
{
"compilationTarget": {
"FeeBurner.sol": "FeeBurner"
},
"libraries": {},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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