diff --git a/contracts/protocols/InstaMaker.sol b/contracts/protocols/MakerDAO/InstaMaker.sol similarity index 100% rename from contracts/protocols/InstaMaker.sol rename to contracts/protocols/MakerDAO/InstaMaker.sol diff --git a/contracts/protocols/MakerDAO/MakerResolver.sol b/contracts/protocols/MakerDAO/MakerResolver.sol new file mode 100644 index 0000000..84b0afb --- /dev/null +++ b/contracts/protocols/MakerDAO/MakerResolver.sol @@ -0,0 +1,207 @@ +// Resolver to Wipe & Coll CDP + +pragma solidity 0.4.24; + + +library SafeMath { + + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + if (a == 0) { + return 0; + } + uint256 c = a * b; + require(c / a == b, "Assertion Failed"); + return c; + } + + function div(uint256 a, uint256 b) internal pure returns (uint256) { + require(b > 0, "Assertion Failed"); + uint256 c = a / b; + return c; + } + +} + +interface IERC20 { + function balanceOf(address who) external view returns (uint256); + function transfer(address to, uint256 value) external returns (bool); + function approve(address spender, uint256 value) external returns (bool); + function transferFrom(address from, address to, uint256 value) external returns (bool); +} + +interface AddressRegistry { + function getAddr(string name) external view returns(address); +} + +interface MakerCDP { + function join(uint wad) external; // Join PETH + function lock(bytes32 cup, uint wad) external; + function wipe(bytes32 cup, uint wad) external; + function per() external view returns (uint ray); +} + +interface PriceInterface { + function peek() external view returns (bytes32, bool); +} + +interface WETHFace { + function deposit() external payable; + function withdraw(uint wad) external; +} + +interface InstaKyber { + function executeTrade( + address src, + address dest, + uint srcAmt, + uint minConversionRate, + uint maxDestAmt + ) external payable returns (uint destAmt); + + function getExpectedPrice( + address src, + address dest, + uint srcAmt + ) external view returns (uint, uint); +} + + +contract Registry { + + address public addressRegistry; + modifier onlyAdmin() { + require( + msg.sender == getAddress("admin"), + "Permission Denied" + ); + _; + } + + function getAddress(string name) internal view returns(address) { + AddressRegistry addrReg = AddressRegistry(addressRegistry); + return addrReg.getAddr(name); + } + +} + + +contract Helper is Registry { + + using SafeMath for uint; + using SafeMath for uint256; + + address cdpAddr; // cups + + function pethPEReth(uint ethNum) public view returns (uint rPETH) { + MakerCDP loanMaster = MakerCDP(cdpAddr); + rPETH = (ethNum.mul(10 ** 27)).div(loanMaster.per()); + } + +} + + +contract Lock is Helper { + + event LockedETH(address lockedBy, uint lockETH, uint lockPETH); + + function lockETH(uint cdpNum) public payable { + MakerCDP loanMaster = MakerCDP(cdpAddr); + WETHFace wethTkn = WETHFace(getAddress("weth")); + wethTkn.deposit.value(msg.value)(); // ETH to WETH + uint pethToLock = pethPEReth(msg.value); + loanMaster.join(pethToLock); // WETH to PETH + loanMaster.lock(bytes32(cdpNum), pethToLock); // PETH to CDP + emit LockedETH(msg.sender, msg.value, pethToLock); + } + +} + + +contract Wipe is Lock { + + event WipedDAI(address wipedBy, uint daiWipe, uint mkrCharged); + + function wipeDAI(uint daiWipe, uint cdpNum) public payable { + address dai = getAddress("dai"); + address mkr = getAddress("mkr"); + address eth = getAddress("eth"); + + IERC20 daiTkn = IERC20(dai); + IERC20 mkrTkn = IERC20(mkr); + + uint contractMKR = mkrTkn.balanceOf(address(this)); // contract MKR balance before wiping + daiTkn.transferFrom(msg.sender, address(this), daiWipe); // get DAI to pay the debt + MakerCDP loanMaster = MakerCDP(cdpAddr); + loanMaster.wipe(bytes32(cdpNum), daiWipe); // wipe DAI + uint mkrCharged = contractMKR - mkrTkn.balanceOf(address(this)); // MKR fee = before wiping bal - after wiping bal + + // claiming paid MKR back + if (msg.value > 0) { // Interacting with Kyber to swap ETH with MKR + swapETHMKR( + eth, mkr, mkrCharged, msg.value + ); + } else { // take MKR directly from address + mkrTkn.transferFrom(msg.sender, address(this), mkrCharged); // user paying MKR fees + } + + emit WipedDAI(msg.sender, daiWipe, mkrCharged); + } + + function swapETHMKR( + address eth, + address mkr, + uint mkrCharged, + uint ethQty + ) internal + { + InstaKyber instak = InstaKyber(getAddress("InstaKyber")); + uint minRate; + (, minRate) = instak.getExpectedPrice(eth, mkr, ethQty); + uint mkrBought = instak.executeTrade.value(ethQty)( + eth, mkr, ethQty, minRate, mkrCharged + ); + require(mkrCharged == mkrBought, "ETH not sufficient to cover the MKR fees."); + if (address(this).balance > 0) { + msg.sender.transfer(address(this).balance); + } + } + +} + + +contract ApproveTkn is Wipe { + + function approveERC20() public { + IERC20 wethTkn = IERC20(getAddress("weth")); + wethTkn.approve(cdpAddr, 2**256 - 1); + IERC20 pethTkn = IERC20(getAddress("peth")); + pethTkn.approve(cdpAddr, 2**256 - 1); + IERC20 mkrTkn = IERC20(getAddress("mkr")); + mkrTkn.approve(cdpAddr, 2**256 - 1); + IERC20 daiTkn = IERC20(getAddress("dai")); + daiTkn.approve(cdpAddr, 2**256 - 1); + } + +} + + +contract MakerResolver is ApproveTkn { + + event MKRCollected(uint amount); + + constructor(address rAddr) public { + addressRegistry = rAddr; + cdpAddr = getAddress("cdp"); + approveERC20(); + } + + function () public payable {} + + // collecting MKR token kept as balance to pay fees + function collectMKR(uint amount) public onlyAdmin { + IERC20 mkrTkn = IERC20(getAddress("mkr")); + mkrTkn.transfer(msg.sender, amount); + emit MKRCollected(amount); + } + +} \ No newline at end of file