smart-contract/contracts/bridges/MakerCompound.sol
2019-06-12 14:33:00 +05:30

162 lines
6.0 KiB
Solidity

pragma solidity ^0.5.7;
interface RegistryInterface {
function proxies(address) external view returns (address);
}
interface CTokenInterface {
function mint(uint mintAmount) external returns (uint); // For ERC20
function repayBorrow(uint repayAmount) external returns (uint); // For ERC20
function repayBorrowBehalf(address borrower, uint repayAmount) external returns (uint); // For ERC20
function borrowBalanceCurrent(address account) external returns (uint);
function redeem(uint redeemTokens) external returns (uint);
function redeemUnderlying(uint redeemAmount) external returns (uint);
function borrow(uint borrowAmount) external returns (uint);
function liquidateBorrow(address borrower, uint repayAmount, address cTokenCollateral) external returns (uint);
function liquidateBorrow(address borrower, address cTokenCollateral) external payable;
function exchangeRateCurrent() external returns (uint);
function getCash() external view returns (uint);
function totalBorrowsCurrent() external returns (uint);
function borrowRatePerBlock() external view returns (uint);
function supplyRatePerBlock() external view returns (uint);
function totalReserves() external view returns (uint);
function reserveFactorMantissa() external view returns (uint);
function totalSupply() external view returns (uint256);
function balanceOf(address owner) external view returns (uint256 balance);
function allowance(address, address) external view returns (uint);
function approve(address, uint) external;
function transfer(address, uint) external returns (bool);
function transferFrom(address, address, uint) external returns (bool);
}
interface ERC20Interface {
function allowance(address, address) external view returns (uint);
function balanceOf(address) external view returns (uint);
function approve(address, uint) external;
function transfer(address, uint) external returns (bool);
function transferFrom(address, address, uint) external returns (bool);
}
contract DSMath {
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x, "math-not-safe");
}
function mul(uint x, uint y) internal pure returns (uint z) {
require(y == 0 || (z = x * y) / y == x, "math-not-safe");
}
uint constant WAD = 10 ** 18;
function wmul(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, y), WAD / 2) / WAD;
}
function wdiv(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, WAD), y / 2) / y;
}
}
contract Helper is DSMath {
address public daiAdd = 0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359;
address public cDaiAdd = 0xF5DCe57282A584D2746FaF1593d3121Fcac444dC;
address public registryAdd = 0xF5DCe57282A584D2746FaF1593d3121Fcac444dC;
mapping (address => uint) public deposited; // Amount of CToken deposited
mapping (address => bool) public isAdmin;
/**
* @dev setting allowance to compound for the "user proxy" if required
*/
function setApproval(address erc20, uint srcAmt, address to) public {
require(isAdmin[msg.sender] == true, "Not-Admin");
ERC20Interface erc20Contract = ERC20Interface(erc20);
uint tokenAllowance = erc20Contract.allowance(address(this), to);
if (srcAmt > tokenAllowance) {
erc20Contract.approve(to, 2**255);
}
}
}
contract Bridge is Helper {
function depositDAI(uint amt) public {
ERC20Interface(daiAdd).transferFrom(msg.sender, address(this), amt);
CTokenInterface cToken = CTokenInterface(cDaiAdd);
assert(cToken.mint(amt) == 0);
uint cDaiAmt = wdiv(amt, cToken.exchangeRateCurrent());
deposited[msg.sender] += cDaiAmt;
}
function withdrawDAI(uint amt) public {
CTokenInterface cToken = CTokenInterface(cDaiAdd);
uint withdrawAmt = wdiv(amt, cToken.exchangeRateCurrent());
uint daiAmt = amt;
if (withdrawAmt > deposited[msg.sender]) {
withdrawAmt = deposited[msg.sender];
daiAmt = wmul(withdrawAmt, cToken.exchangeRateCurrent());
}
require(cToken.redeem(withdrawAmt) == 0, "something went wrong");
ERC20Interface(daiAdd).transfer(msg.sender, daiAmt);
deposited[msg.sender] -= withdrawAmt;
}
function depositCDAI(uint amt) public {
CTokenInterface cToken = CTokenInterface(cDaiAdd);
cToken.transferFrom(msg.sender, address(this), amt);
deposited[msg.sender] += amt;
}
function withdrawCDAI(uint amt) public {
require(deposited[msg.sender] != 0, "something went wrong");
CTokenInterface cToken = CTokenInterface(cDaiAdd);
uint withdrawAmt = amt;
if (withdrawAmt > deposited[msg.sender]) {
withdrawAmt = deposited[msg.sender];
}
cToken.transfer(msg.sender, withdrawAmt);
deposited[msg.sender] -= withdrawAmt;
}
function transferDAI(uint amt) public {
require(RegistryInterface(registryAdd).proxies(msg.sender) != address(0), "Not-User-Wallet");
CTokenInterface cToken = CTokenInterface(cDaiAdd);
require(cToken.redeemUnderlying(amt) == 0, "something went wrong");
ERC20Interface(daiAdd).transfer(msg.sender, amt);
}
function transferBackDAI(uint amt) public {
require(RegistryInterface(registryAdd).proxies(msg.sender) != address(0), "Not-User-Wallet");
ERC20Interface tokenContract = ERC20Interface(daiAdd);
tokenContract.transferFrom(msg.sender, address(this), amt);
CTokenInterface cToken = CTokenInterface(cDaiAdd);
assert(cToken.mint(amt) == 0);
}
}
contract MakerCompBridge is Bridge {
uint public version;
/**
* @dev setting up variables on deployment
* 1...2...3 versioning in each subsequent deployments
*/
constructor(uint _version) public {
isAdmin[0x7284a8451d9a0e7Dc62B3a71C0593eA2eC5c5638] = true;
isAdmin[0xa7615CD307F323172331865181DC8b80a2834324] = true;
version = _version;
}
function() external payable {}
}