ERC-1155
Overview
Max Total Supply
0
Holders
4
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
WStakingRewards
Compiler Version
v0.6.12+commit.27d51765
Contract Source Code (Solidity Standard Json-Input format)
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/ERC1155.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/utils/ReentrancyGuard.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/IERC20Wrapper.sol'; import '../../interfaces/IStakingRewards.sol'; contract WStakingRewards is ERC1155('WStakingRewards'), ReentrancyGuard, IERC20Wrapper { using SafeMath for uint; using HomoraMath for uint; using SafeERC20 for IERC20; address public immutable staking; address public immutable underlying; address public immutable reward; constructor( address _staking, address _underlying, address _reward ) public { staking = _staking; underlying = _underlying; reward = _reward; IERC20(_underlying).approve(_staking, uint(-1)); } function getUnderlyingToken(uint) external view override returns (address) { return underlying; } function getUnderlyingRate(uint) external view override returns (uint) { return 2**112; } function mint(uint amount) external nonReentrant returns (uint) { IERC20(underlying).safeTransferFrom(msg.sender, address(this), amount); IStakingRewards(staking).stake(amount); uint rewardPerToken = IStakingRewards(staking).rewardPerToken(); _mint(msg.sender, rewardPerToken, amount, ''); return rewardPerToken; } function burn(uint id, uint amount) external nonReentrant returns (uint) { if (amount == uint(-1)) { amount = balanceOf(msg.sender, id); } _burn(msg.sender, id, amount); IStakingRewards(staking).withdraw(amount); IStakingRewards(staking).getReward(); IERC20(underlying).safeTransfer(msg.sender, amount); uint stRewardPerToken = id; uint enRewardPerToken = IStakingRewards(staking).rewardPerToken(); uint stReward = stRewardPerToken.mul(amount).divCeil(1e18); uint enReward = enRewardPerToken.mul(amount).div(1e18); if (enReward > stReward) { IERC20(reward).safeTransfer(msg.sender, enReward.sub(stReward)); } return enRewardPerToken; } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/ERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/cryptography/MerkleProof.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import 'OpenZeppelin/[email protected]/contracts/utils/ReentrancyGuard.sol'; import './Governable.sol'; import '../interfaces/ICErc20.sol'; contract SafeBox is Governable, ERC20, ReentrancyGuard { using SafeMath for uint; using SafeERC20 for IERC20; event Claim(address user, uint amount); ICErc20 public immutable cToken; IERC20 public immutable uToken; address public relayer; bytes32 public root; mapping(address => uint) public claimed; constructor( ICErc20 _cToken, string memory _name, string memory _symbol ) public ERC20(_name, _symbol) { IERC20 _uToken = IERC20(_cToken.underlying()); __Governable__init(); cToken = _cToken; uToken = _uToken; relayer = msg.sender; _uToken.approve(address(_cToken), uint(-1)); } function setRelayer(address _relayer) external onlyGov { relayer = _relayer; } function updateRoot(bytes32 _root) external { require(msg.sender == relayer || msg.sender == governor, '!relayer'); root = _root; } function deposit(uint amount) external nonReentrant { uint uBalanceBefore = uToken.balanceOf(address(this)); uToken.safeTransferFrom(msg.sender, address(this), amount); uint uBalanceAfter = uToken.balanceOf(address(this)); uint cBalanceBefore = cToken.balanceOf(address(this)); require(cToken.mint(uBalanceAfter.sub(uBalanceBefore)) == 0, '!mint'); uint cBalanceAfter = cToken.balanceOf(address(this)); _mint(msg.sender, cBalanceAfter.sub(cBalanceBefore)); } function withdraw(uint amount) public nonReentrant { _burn(msg.sender, amount); uint uBalanceBefore = uToken.balanceOf(address(this)); require(cToken.redeem(amount) == 0, '!redeem'); uint uBalanceAfter = uToken.balanceOf(address(this)); uToken.safeTransfer(msg.sender, uBalanceAfter.sub(uBalanceBefore)); } function claim(uint totalReward, bytes32[] memory proof) public nonReentrant { bytes32 leaf = keccak256(abi.encodePacked(msg.sender, totalReward)); require(MerkleProof.verify(proof, root, leaf), '!proof'); uint send = totalReward.sub(claimed[msg.sender]); claimed[msg.sender] = totalReward; uToken.safeTransfer(msg.sender, send); emit Claim(msg.sender, send); } function adminClaim(uint amount) external onlyGov { uToken.safeTransfer(msg.sender, amount); } function claimAndWithdraw( uint claimAmount, bytes32[] memory proof, uint withdrawAmount ) external { claim(claimAmount, proof); withdraw(withdrawAmount); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/proxy/Initializable.sol'; contract Governable is Initializable { address public governor; // The current governor. address public pendingGovernor; // The address pending to become the governor once accepted. modifier onlyGov() { require(msg.sender == governor, 'not the governor'); _; } /// @dev Initialize the bank smart contract, using msg.sender as the first governor. function __Governable__init() internal initializer { governor = msg.sender; pendingGovernor = address(0); } /// @dev Set the pending governor, which will be the governor once accepted. /// @param _pendingGovernor The address to become the pending governor. function setPendingGovernor(address _pendingGovernor) external onlyGov { pendingGovernor = _pendingGovernor; } /// @dev Accept to become the new governor. Must be called by the pending governor. function acceptGovernor() external { require(msg.sender == pendingGovernor, 'not the pending governor'); pendingGovernor = address(0); governor = msg.sender; } }
pragma solidity 0.6.12; interface ICErc20 { function underlying() external returns (address); function mint(uint mintAmount) external returns (uint); function redeem(uint redeemTokens) external returns (uint); function balanceOf(address user) external view returns (uint); function borrowBalanceCurrent(address account) external returns (uint); function borrowBalanceStored(address account) external view returns (uint); function borrow(uint borrowAmount) external returns (uint); function repayBorrow(uint repayAmount) external returns (uint); }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/ERC1155.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/utils/ReentrancyGuard.sol'; import '../../interfaces/IWERC20.sol'; contract WERC20 is ERC1155('WERC20'), ReentrancyGuard, IWERC20 { using SafeERC20 for IERC20; /// @dev Return the underlying ERC-20 for the given ERC-1155 token id. function getUnderlyingToken(uint id) external view override returns (address) { address token = address(id); require(uint(token) == id, 'id overflow'); return token; } /// @dev Return the conversion rate from ERC-1155 to ERC-20, multiplied by 2**112. function getUnderlyingRate(uint) external view override returns (uint) { return 2**112; } /// @dev Return the underlying ERC20 balance for the user. function balanceOfERC20(address token, address user) external view override returns (uint) { return balanceOf(user, uint(token)); } /// @dev Mint ERC1155 token for the given ERC20 token. function mint(address token, uint amount) external override nonReentrant { uint balanceBefore = IERC20(token).balanceOf(address(this)); IERC20(token).safeTransferFrom(msg.sender, address(this), amount); uint balanceAfter = IERC20(token).balanceOf(address(this)); _mint(msg.sender, uint(token), balanceAfter.sub(balanceBefore), ''); } /// @dev Burn ERC1155 token to redeem ERC20 token back. function burn(address token, uint amount) external override nonReentrant { _burn(msg.sender, uint(token), amount); IERC20(token).safeTransfer(msg.sender, amount); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/IERC1155.sol'; import './IERC20Wrapper.sol'; interface IWERC20 is IERC1155, IERC20Wrapper { /// @dev Return the underlying ERC20 balance for the user. function balanceOfERC20(address token, address user) external view returns (uint); /// @dev Mint ERC1155 token for the given ERC20 token. function mint(address token, uint amount) external; /// @dev Burn ERC1155 token to redeem ERC20 token back. function burn(address token, uint amount) external; }
pragma solidity 0.6.12; interface IERC20Wrapper { /// @dev Return the underlying ERC-20 for the given ERC-1155 token id. function getUnderlyingToken(uint id) external view returns (address); /// @dev Return the conversion rate from ERC-1155 to ERC-20, multiplied by 2**112. function getUnderlyingRate(uint id) external view returns (uint); }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; library HomoraMath { using SafeMath for uint; function divCeil(uint lhs, uint rhs) internal pure returns (uint) { return lhs.add(rhs).sub(1) / rhs; } function fmul(uint lhs, uint rhs) internal pure returns (uint) { return lhs.mul(rhs) / (2**112); } function fdiv(uint lhs, uint rhs) internal pure returns (uint) { return lhs.mul(2**112) / rhs; } function sqrt(uint x) internal pure returns (uint y) { uint z = (x + 1) / 2; y = x; while (z < y) { y = z; z = (x / z + z) / 2; } } }
pragma solidity 0.6.12; interface IStakingRewards { function rewardPerToken() external view returns (uint); function stake(uint amount) external; function withdraw(uint amount) external; function getReward() external; }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/ERC1155.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/utils/ReentrancyGuard.sol'; import '../Governable.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/IERC20Wrapper.sol'; import '../../interfaces/ICurveRegistry.sol'; import '../../interfaces/ILiquidityGauge.sol'; interface ILiquidityGaugeMinter { function mint(address gauge) external; } contract WLiquidityGauge is ERC1155('WLiquidityGauge'), ReentrancyGuard, IERC20Wrapper, Governable { using SafeMath for uint; using HomoraMath for uint; using SafeERC20 for IERC20; struct GaugeInfo { ILiquidityGauge impl; uint accCrvPerShare; } ICurveRegistry public immutable registry; IERC20 public immutable crv; mapping(uint => mapping(uint => GaugeInfo)) public gauges; constructor(ICurveRegistry _registry, IERC20 _crv) public { __Governable__init(); registry = _registry; crv = _crv; } function encodeId( uint pid, uint gid, uint crvPerShare ) public pure returns (uint id) { require(pid < (1 << 8), 'bad pid'); require(gid < (1 << 8), 'bad gid'); require(crvPerShare < (1 << 240), 'bad crv per share'); return (pid << 248) | (gid << 240) | crvPerShare; } function decodeId(uint id) public pure returns ( uint pid, uint gid, uint crvPerShare ) { pid = id >> 248; // First 8 bits gid = (id >> 240) & (255); // Next 8 bits crvPerShare = id & ((1 << 240) - 1); // Last 240 bits } function getUnderlyingToken(uint id) external view override returns (address) { (uint pid, uint gid, ) = decodeId(id); ILiquidityGauge impl = gauges[pid][gid].impl; require(address(impl) != address(0), 'no gauge'); return impl.lp_token(); } /// @dev Return the conversion rate from ERC-1155 to ERC-20, multiplied by 2**112. function getUnderlyingRate(uint) external view override returns (uint) { return 2**112; } function registerGauge(uint pid, uint gid) external onlyGov { require(address(gauges[pid][gid].impl) == address(0), 'gauge already exists'); address pool = registry.pool_list(pid); require(pool != address(0), 'no pool'); (address[10] memory _gauges, ) = registry.get_gauges(pool); address gauge = _gauges[gid]; require(gauge != address(0), 'no gauge'); IERC20 lpToken = IERC20(ILiquidityGauge(gauge).lp_token()); lpToken.approve(gauge, 0); lpToken.approve(gauge, uint(-1)); gauges[pid][gid] = GaugeInfo({impl: ILiquidityGauge(gauge), accCrvPerShare: 0}); } function mint( uint pid, uint gid, uint amount ) external nonReentrant returns (uint) { GaugeInfo storage gauge = gauges[pid][gid]; ILiquidityGauge impl = gauge.impl; require(address(impl) != address(0), 'gauge not registered'); mintCrv(gauge); IERC20 lpToken = IERC20(impl.lp_token()); lpToken.safeTransferFrom(msg.sender, address(this), amount); impl.deposit(amount); uint id = encodeId(pid, gid, gauge.accCrvPerShare); _mint(msg.sender, id, amount, ''); return id; } function burn(uint id, uint amount) external nonReentrant returns (uint) { if (amount == uint(-1)) { amount = balanceOf(msg.sender, id); } (uint pid, uint gid, uint stCrvPerShare) = decodeId(id); _burn(msg.sender, id, amount); GaugeInfo storage gauge = gauges[pid][gid]; ILiquidityGauge impl = gauge.impl; require(address(impl) != address(0), 'gauge not registered'); mintCrv(gauge); impl.withdraw(amount); IERC20(impl.lp_token()).safeTransfer(msg.sender, amount); uint stCrv = stCrvPerShare.mul(amount).divCeil(1e18); uint enCrv = gauge.accCrvPerShare.mul(amount).div(1e18); if (enCrv > stCrv) { crv.safeTransfer(msg.sender, enCrv.sub(stCrv)); } return pid; } function mintCrv(GaugeInfo storage gauge) internal { ILiquidityGauge impl = gauge.impl; uint balanceBefore = crv.balanceOf(address(this)); ILiquidityGaugeMinter(impl.minter()).mint(address(impl)); uint balanceAfter = crv.balanceOf(address(this)); uint gain = balanceAfter.sub(balanceBefore); uint supply = impl.balanceOf(address(this)); if (gain > 0 && supply > 0) { gauge.accCrvPerShare = gauge.accCrvPerShare.add(gain.mul(1e18).div(supply)); } } }
pragma solidity 0.6.12; interface ICurveRegistry { function get_n_coins(address lp) external view returns (uint); function pool_list(uint id) external view returns (address); function get_coins(address pool) external view returns (address[8] memory); function get_gauges(address pool) external view returns (address[10] memory, uint128[10] memory); function get_lp_token(address pool) external view returns (address); function get_pool_from_lp_token(address lp) external view returns (address); }
pragma solidity 0.6.12; interface ILiquidityGauge { function minter() external view returns (address); function crv_token() external view returns (address); function lp_token() external view returns (address); function balanceOf(address addr) external view returns (uint); function deposit(uint value) external; function withdraw(uint value) external; }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/ERC1155.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/utils/ReentrancyGuard.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/IERC20Wrapper.sol'; import '../../interfaces/IMasterChef.sol'; contract WMasterChef is ERC1155('WMasterChef'), ReentrancyGuard, IERC20Wrapper { using SafeMath for uint; using HomoraMath for uint; using SafeERC20 for IERC20; IMasterChef public immutable chef; IERC20 public immutable sushi; constructor(IMasterChef _chef) public { chef = _chef; sushi = IERC20(_chef.sushi()); } function encodeId(uint pid, uint sushiPerShare) public pure returns (uint id) { require(pid < (1 << 16), 'bad pid'); require(sushiPerShare < (1 << 240), 'bad sushi per share'); return (pid << 240) | sushiPerShare; } function decodeId(uint id) public pure returns (uint pid, uint sushiPerShare) { pid = id >> 240; // First 16 bits sushiPerShare = id & ((1 << 240) - 1); // Last 240 bits } /// @dev Return the underlying ERC-20 for the given ERC-1155 token id. function getUnderlyingToken(uint id) external view override returns (address) { (uint pid, ) = decodeId(id); (address lpToken, , , ) = chef.poolInfo(pid); return lpToken; } /// @dev Return the conversion rate from ERC-1155 to ERC-20, multiplied by 2**112. function getUnderlyingRate(uint) external view override returns (uint) { return 2**112; } /// @dev Mint ERC1155 token for the given pool id. /// @return The token id that got minted. function mint(uint pid, uint amount) external nonReentrant returns (uint) { (address lpToken, , , ) = chef.poolInfo(pid); IERC20(lpToken).safeTransferFrom(msg.sender, address(this), amount); if (IERC20(lpToken).allowance(address(this), address(chef)) != uint(-1)) { // We only need to do this once per pool, as LP token's allowance won't decrease if it's -1. IERC20(lpToken).approve(address(chef), uint(-1)); } chef.deposit(pid, amount); (, , , uint sushiPerShare) = chef.poolInfo(pid); uint id = encodeId(pid, sushiPerShare); _mint(msg.sender, id, amount, ''); return id; } /// @dev Burn ERC1155 token to redeem LP ERC20 token back plus SUSHI rewards. /// @return The pool id that that you received LP token back. function burn(uint id, uint amount) external nonReentrant returns (uint) { if (amount == uint(-1)) { amount = balanceOf(msg.sender, id); } (uint pid, uint stSushiPerShare) = decodeId(id); _burn(msg.sender, id, amount); chef.withdraw(pid, amount); (address lpToken, , , uint enSushiPerShare) = chef.poolInfo(pid); IERC20(lpToken).safeTransfer(msg.sender, amount); uint stSushi = stSushiPerShare.mul(amount).divCeil(1e12); uint enSushi = enSushiPerShare.mul(amount).div(1e12); if (enSushi > stSushi) { sushi.safeTransfer(msg.sender, enSushi.sub(stSushi)); } return pid; } /// @dev Burn ERC1155 token to redeem LP ERC20 token back without taking SUSHI rewards. /// @return The pool id that that you received LP token back. function emergencyBurn(uint id, uint amount) external nonReentrant returns (uint) { (uint pid, ) = decodeId(id); _burn(msg.sender, id, amount); chef.withdraw(pid, amount); (address lpToken, , , ) = chef.poolInfo(pid); IERC20(lpToken).safeTransfer(msg.sender, amount); return pid; } }
pragma solidity 0.6.12; interface IMasterChef { function sushi() external view returns (address); function poolInfo(uint pid) external view returns ( address lpToken, uint allocPoint, uint lastRewardBlock, uint accSushiPerShare ); function deposit(uint pid, uint amount) external; function withdraw(uint pid, uint amount) external; }
pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import './BasicSpell.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/IUniswapV2Factory.sol'; import '../../interfaces/IUniswapV2Router02.sol'; import '../../interfaces/IUniswapV2Pair.sol'; import '../../interfaces/IWStakingRewards.sol'; contract UniswapV2SpellV1 is BasicSpell { using SafeMath for uint; using HomoraMath for uint; IUniswapV2Factory public factory; IUniswapV2Router02 public router; mapping(address => mapping(address => address)) public pairs; constructor( IBank _bank, address _werc20, IUniswapV2Router02 _router ) public BasicSpell(_bank, _werc20, _router.WETH()) { router = _router; factory = IUniswapV2Factory(_router.factory()); } function getPair(address tokenA, address tokenB) public returns (address) { address lp = pairs[tokenA][tokenB]; if (lp == address(0)) { lp = factory.getPair(tokenA, tokenB); require(lp != address(0), 'no lp token'); ensureApprove(tokenA, address(router)); ensureApprove(tokenB, address(router)); ensureApprove(lp, address(router)); pairs[tokenA][tokenB] = lp; pairs[tokenB][tokenA] = lp; } return lp; } /// @dev Compute optimal deposit amount /// @param amtA amount of token A desired to deposit /// @param amtB amount of token B desired to deposit /// @param resA amount of token A in reserve /// @param resB amount of token B in reserve function optimalDeposit( uint amtA, uint amtB, uint resA, uint resB ) internal pure returns (uint swapAmt, bool isReversed) { if (amtA.mul(resB) >= amtB.mul(resA)) { swapAmt = _optimalDepositA(amtA, amtB, resA, resB); isReversed = false; } else { swapAmt = _optimalDepositA(amtB, amtA, resB, resA); isReversed = true; } } /// @dev Compute optimal deposit amount helper. /// @param amtA amount of token A desired to deposit /// @param amtB amount of token B desired to deposit /// @param resA amount of token A in reserve /// @param resB amount of token B in reserve /// Formula: https://blog.alphafinance.io/byot/ function _optimalDepositA( uint amtA, uint amtB, uint resA, uint resB ) internal pure returns (uint) { require(amtA.mul(resB) >= amtB.mul(resA), 'Reversed'); uint a = 997; uint b = uint(1997).mul(resA); uint _c = (amtA.mul(resB)).sub(amtB.mul(resA)); uint c = _c.mul(1000).div(amtB.add(resB)).mul(resA); uint d = a.mul(c).mul(4); uint e = HomoraMath.sqrt(b.mul(b).add(d)); uint numerator = e.sub(b); uint denominator = a.mul(2); return numerator.div(denominator); } struct Amounts { uint amtAUser; uint amtBUser; uint amtLPUser; uint amtABorrow; uint amtBBorrow; uint amtLPBorrow; uint amtAMin; uint amtBMin; } function addLiquidityInternal( address tokenA, address tokenB, Amounts calldata amt ) internal { address lp = getPair(tokenA, tokenB); // 1. Get user input amounts doTransmitETH(); doTransmit(tokenA, amt.amtAUser); doTransmit(tokenB, amt.amtBUser); doTransmit(lp, amt.amtLPUser); // 2. Borrow specified amounts doBorrow(tokenA, amt.amtABorrow); doBorrow(tokenB, amt.amtBBorrow); doBorrow(lp, amt.amtLPBorrow); // 3. Calculate optimal swap amount uint swapAmt; bool isReversed; { uint amtA = IERC20(tokenA).balanceOf(address(this)); uint amtB = IERC20(tokenB).balanceOf(address(this)); uint resA; uint resB; if (IUniswapV2Pair(lp).token0() == tokenA) { (resA, resB, ) = IUniswapV2Pair(lp).getReserves(); } else { (resB, resA, ) = IUniswapV2Pair(lp).getReserves(); } (swapAmt, isReversed) = optimalDeposit(amtA, amtB, resA, resB); } // 4. Swap optimal amount { address[] memory path = new address[](2); (path[0], path[1]) = isReversed ? (tokenB, tokenA) : (tokenA, tokenB); router.swapExactTokensForTokens(swapAmt, 0, path, address(this), now); } // 5. Add liquidity router.addLiquidity( tokenA, tokenB, IERC20(tokenA).balanceOf(address(this)), IERC20(tokenB).balanceOf(address(this)), amt.amtAMin, amt.amtBMin, address(this), now ); } function addLiquidityWERC20( address tokenA, address tokenB, Amounts calldata amt ) external payable { address lp = getPair(tokenA, tokenB); // 1-5. add liquidity addLiquidityInternal(tokenA, tokenB, amt); // 6. Put collateral doPutCollateral(lp, IERC20(lp).balanceOf(address(this))); // 7. Refund leftovers to users doRefundETH(); doRefund(tokenA); doRefund(tokenB); } function addLiquidityWStakingRewards( address tokenA, address tokenB, Amounts calldata amt, address wstaking ) external payable { address lp = getPair(tokenA, tokenB); address reward = IWStakingRewards(wstaking).reward(); // 1-5. add liquidity addLiquidityInternal(tokenA, tokenB, amt); // 6. Take out collateral uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, uint collSize) = bank.getPositionInfo(positionId); if (collSize > 0) { require(IWStakingRewards(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); bank.takeCollateral(wstaking, collId, collSize); IWStakingRewards(wstaking).burn(collId, collSize); } // 7. Put collateral ensureApprove(lp, wstaking); uint amount = IERC20(lp).balanceOf(address(this)); uint id = IWStakingRewards(wstaking).mint(amount); if (!IWStakingRewards(wstaking).isApprovedForAll(address(this), address(bank))) { IWStakingRewards(wstaking).setApprovalForAll(address(bank), true); } bank.putCollateral(address(wstaking), id, amount); // 8. Refund leftovers to users doRefundETH(); doRefund(tokenA); doRefund(tokenB); // 9. Refund reward doRefund(reward); } struct RepayAmounts { uint amtLPTake; uint amtLPWithdraw; uint amtARepay; uint amtBRepay; uint amtLPRepay; uint amtAMin; uint amtBMin; } function removeLiquidityInternal( address tokenA, address tokenB, RepayAmounts calldata amt ) internal { address lp = getPair(tokenA, tokenB); uint positionId = bank.POSITION_ID(); uint amtARepay = amt.amtARepay; uint amtBRepay = amt.amtBRepay; uint amtLPRepay = amt.amtLPRepay; // 2. Compute repay amount if MAX_INT is supplied (max debt) if (amtARepay == uint(-1)) { amtARepay = bank.borrowBalanceCurrent(positionId, tokenA); } if (amtBRepay == uint(-1)) { amtBRepay = bank.borrowBalanceCurrent(positionId, tokenB); } if (amtLPRepay == uint(-1)) { amtLPRepay = bank.borrowBalanceCurrent(positionId, lp); } // 3. Compute amount to actually remove uint amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amt.amtLPWithdraw); // 4. Remove liquidity (uint amtA, uint amtB) = router.removeLiquidity(tokenA, tokenB, amtLPToRemove, 0, 0, address(this), now); // 5. MinimizeTrading uint amtADesired = amtARepay.add(amt.amtAMin); uint amtBDesired = amtBRepay.add(amt.amtBMin); if (amtA < amtADesired && amtB >= amtBDesired) { address[] memory path = new address[](2); (path[0], path[1]) = (tokenB, tokenA); router.swapTokensForExactTokens( amtADesired.sub(amtA), amtB.sub(amtBDesired), path, address(this), now ); } else if (amtA >= amtADesired && amtB < amtBDesired) { address[] memory path = new address[](2); (path[0], path[1]) = (tokenA, tokenB); router.swapTokensForExactTokens( amtBDesired.sub(amtB), amtA.sub(amtADesired), path, address(this), now ); } // 6. Repay doRepay(tokenA, amtARepay); doRepay(tokenB, amtBRepay); doRepay(lp, amtLPRepay); // 7. Slippage control require(IERC20(tokenA).balanceOf(address(this)) >= amt.amtAMin); require(IERC20(tokenB).balanceOf(address(this)) >= amt.amtBMin); require(IERC20(lp).balanceOf(address(this)) >= amt.amtLPWithdraw); // 8. Refund leftover doRefundETH(); doRefund(tokenA); doRefund(tokenB); doRefund(lp); } function removeLiquidityWERC20( address tokenA, address tokenB, RepayAmounts calldata amt ) external { address lp = getPair(tokenA, tokenB); // 1. Take out collateral doTakeCollateral(lp, amt.amtLPTake); // 2-8. remove liquidity removeLiquidityInternal(tokenA, tokenB, amt); } function removeLiquidityWStakingRewards( address tokenA, address tokenB, RepayAmounts calldata amt, address wstaking ) external { address lp = getPair(tokenA, tokenB); uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, ) = bank.getPositionInfo(positionId); address reward = IWStakingRewards(wstaking).reward(); // 1. Take out collateral require(IWStakingRewards(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); bank.takeCollateral(wstaking, collId, amt.amtLPTake); IWStakingRewards(wstaking).burn(collId, amt.amtLPTake); // 2-8. remove liquidity removeLiquidityInternal(tokenA, tokenB, amt); // 9. Refund reward doRefund(reward); } function harvestWStakingRewards(address wstaking) external { address reward = IWStakingRewards(wstaking).reward(); uint positionId = bank.POSITION_ID(); (, , uint collId, ) = bank.getPositionInfo(positionId); address lp = IWStakingRewards(wstaking).getUnderlyingToken(collId); // 1. Take out collateral bank.takeCollateral(wstaking, collId, uint(-1)); IWStakingRewards(wstaking).burn(collId, uint(-1)); // 2. put collateral uint amount = IERC20(lp).balanceOf(address(this)); ensureApprove(lp, wstaking); uint id = IWStakingRewards(wstaking).mint(amount); bank.putCollateral(wstaking, id, amount); // 3. Refund reward doRefund(reward); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import '../utils/ERC1155NaiveReceiver.sol'; import '../../interfaces/IBank.sol'; import '../../interfaces/IWERC20.sol'; import '../../interfaces/IWETH.sol'; contract BasicSpell is ERC1155NaiveReceiver { using SafeERC20 for IERC20; IBank public immutable bank; IWERC20 public immutable werc20; address public immutable weth; mapping(address => mapping(address => bool)) public approved; constructor( IBank _bank, address _werc20, address _weth ) public { bank = _bank; werc20 = IWERC20(_werc20); weth = _weth; ensureApprove(_weth, address(_bank)); IWERC20(_werc20).setApprovalForAll(address(_bank), true); } /// @dev Ensure that the spell approve the given spender to spend all of its tokens. /// @param token The token to approve. /// @param spender The spender to allow spending. /// NOTE: This is safe because spell is never built to hold fund custody. function ensureApprove(address token, address spender) public { if (!approved[token][spender]) { IERC20(token).safeApprove(spender, uint(-1)); approved[token][spender] = true; } } /// @dev Internal call to convert msg.value ETH to WETH inside the contract. function doTransmitETH() internal { if (msg.value > 0) { IWETH(weth).deposit{value: msg.value}(); } } /// @dev Internal call to transmit tokens from the bank if amount is positive. /// @param token The token to perform the transmit action. /// @param amount The amount to transmit. function doTransmit(address token, uint amount) internal { if (amount > 0) { bank.transmit(token, amount); } } /// @dev Internal call to refund tokens to the current bank executor. /// @param token The token to perform the refund action. function doRefund(address token) internal { uint balance = IERC20(token).balanceOf(address(this)); if (balance > 0) { IERC20(token).safeTransfer(bank.EXECUTOR(), balance); } } /// @dev Internal call to refund all WETH to the current executor as native ETH. function doRefundETH() internal { uint balance = IWETH(weth).balanceOf(address(this)); if (balance > 0) { IWETH(weth).withdraw(balance); (bool success, ) = bank.EXECUTOR().call{value: balance}(new bytes(0)); require(success, 'refund ETH failed'); } } /// @dev Internal call to borrow tokens from the bank on behalf of the current executor. /// @param token The token to borrow from the bank. /// @param amount The amount to borrow. function doBorrow(address token, uint amount) internal { if (amount > 0) { bank.borrow(token, amount); } } /// @dev Internal call to repay tokens to the bank on behalf of the current executor. /// @param token The token to repay to the bank. /// @param amount The amount to repay. function doRepay(address token, uint amount) internal { if (amount > 0) { ensureApprove(token, address(bank)); bank.repay(token, amount); } } /// @dev Internal call to put collateral tokens to the bank. /// @param token The token to put to the bank. /// @param amount The amount to put to the bank. function doPutCollateral(address token, uint amount) internal { if (amount > 0) { ensureApprove(token, address(werc20)); werc20.mint(token, amount); bank.putCollateral(address(werc20), uint(token), amount); } } /// @dev Internal call to take collateral tokens from the bank. /// @param token The token to take back. /// @param amount The amount to take back. function doTakeCollateral(address token, uint amount) internal { if (amount > 0) { if (amount == uint(-1)) { (, , , amount) = bank.getPositionInfo(bank.POSITION_ID()); } bank.takeCollateral(address(werc20), uint(token), amount); werc20.burn(token, amount); } } receive() external payable { require(msg.sender == weth, 'ETH must come from WETH'); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/ERC1155Receiver.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/IERC1155Receiver.sol'; contract ERC1155NaiveReceiver is ERC1155Receiver { function onERC1155Received( address operator, address from, uint id, uint value, bytes calldata data ) external override returns (bytes4) { return this.onERC1155Received.selector; } function onERC1155BatchReceived( address operator, address from, uint[] calldata ids, uint[] calldata values, bytes calldata data ) external override returns (bytes4) { return this.onERC1155BatchReceived.selector; } }
pragma solidity 0.6.12; interface IBank { /// The governor adds a new bank gets added to the system. event AddBank(address token, address cToken); /// The governor upgrades the cToken address for the given bank. event SetCToken(address token, address cToken); /// The governor sets the address of the oracle smart contract. event SetOracle(address oracle); /// The governor sets the basis point fee of the bank. event SetFeeBps(uint feeBps); /// The governor withdraw tokens from the reserve of a bank. event WithdrawReserve(address user, address token, uint amount); /// Someone borrows tokens from a bank via a spell caller. event Borrow(uint positionId, address caller, address token, uint amount, uint share); /// Someone repays tokens to a bank via a spell caller. event Repay(uint positionId, address caller, address token, uint amount, uint share); /// Someone puts tokens as collateral via a spell caller. event PutCollateral(uint positionId, address caller, address token, uint id, uint amount); /// Someone takes tokens from collateral via a spell caller. event TakeCollateral(uint positionId, address caller, address token, uint id, uint amount); /// Someone calls liquidatation on a position, paying debt and taking collateral tokens. event Liquidate( uint positionId, address liquidator, address debtToken, uint amount, uint share, uint bounty ); /// @dev Return the current position while under execution. function POSITION_ID() external view returns (uint); /// @dev Return the current target while under execution. function SPELL() external view returns (address); /// @dev Return the current executor (the owner of the current position). function EXECUTOR() external view returns (address); /// @dev Return bank information for the given token. function getBankInfo(address token) external view returns ( bool isListed, address cToken, uint reserve, uint totalDebt, uint totalShare ); /// @dev Return position information for the given position id. function getPositionInfo(uint positionId) external view returns ( address owner, address collToken, uint collId, uint collateralSize ); /// @dev Return the borrow balance for given positon and token without trigger interest accrual. function borrowBalanceStored(uint positionId, address token) external view returns (uint); /// @dev Trigger interest accrual and return the current borrow balance. function borrowBalanceCurrent(uint positionId, address token) external returns (uint); /// @dev Borrow tokens from the bank. function borrow(address token, uint amount) external; /// @dev Repays tokens to the bank. function repay(address token, uint amountCall) external; /// @dev Transmit user assets to the spell. function transmit(address token, uint amount) external; /// @dev Put more collateral for users. function putCollateral( address collToken, uint collId, uint amountCall ) external; /// @dev Take some collateral back. function takeCollateral( address collToken, uint collId, uint amount ) external; /// @dev Liquidate a position. function liquidate( uint positionId, address debtToken, uint amountCall ) external; function getBorrowETHValue(uint positionId) external view returns (uint); function accrue(address token) external; function nextPositionId() external view returns (uint); }
pragma solidity 0.6.12; interface IWETH { function balanceOf(address user) external returns (uint); function approve(address to, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function deposit() external payable; function withdraw(uint) external; }
pragma solidity >=0.5.0; // https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/interfaces/IUniswapV2Factory.sol interface IUniswapV2Factory { event PairCreated(address indexed token0, address indexed token1, address pair, uint); function feeTo() external view returns (address); function feeToSetter() external view returns (address); function getPair(address tokenA, address tokenB) external view returns (address pair); function allPairs(uint) external view returns (address pair); function allPairsLength() external view returns (uint); function createPair(address tokenA, address tokenB) external returns (address pair); function setFeeTo(address) external; function setFeeToSetter(address) external; }
pragma solidity >=0.6.2; // https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/IUniswapV2Router02.sol import './IUniswapV2Router01.sol'; interface IUniswapV2Router02 is IUniswapV2Router01 { function removeLiquidityETHSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external returns (uint amountETH); function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountETH); function swapExactTokensForTokensSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external; function swapExactETHForTokensSupportingFeeOnTransferTokens( uint amountOutMin, address[] calldata path, address to, uint deadline ) external payable; function swapExactTokensForETHSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external; }
pragma solidity >=0.6.2; // https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/IUniswapV2Router01.sol interface IUniswapV2Router01 { function factory() external pure returns (address); function WETH() external pure returns (address); function addLiquidity( address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns ( uint amountA, uint amountB, uint liquidity ); function addLiquidityETH( address token, uint amountTokenDesired, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external payable returns ( uint amountToken, uint amountETH, uint liquidity ); function removeLiquidity( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns (uint amountA, uint amountB); function removeLiquidityETH( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external returns (uint amountToken, uint amountETH); function removeLiquidityWithPermit( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountA, uint amountB); function removeLiquidityETHWithPermit( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountToken, uint amountETH); function swapExactTokensForTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapTokensForExactTokens( uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapExactETHForTokens( uint amountOutMin, address[] calldata path, address to, uint deadline ) external payable returns (uint[] memory amounts); function swapTokensForExactETH( uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapExactTokensForETH( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapETHForExactTokens( uint amountOut, address[] calldata path, address to, uint deadline ) external payable returns (uint[] memory amounts); function quote( uint amountA, uint reserveA, uint reserveB ) external pure returns (uint amountB); function getAmountOut( uint amountIn, uint reserveIn, uint reserveOut ) external pure returns (uint amountOut); function getAmountIn( uint amountOut, uint reserveIn, uint reserveOut ) external pure returns (uint amountIn); function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts); function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts); }
pragma solidity >=0.5.0; // https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/interfaces/IUniswapV2Pair.sol interface IUniswapV2Pair { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external pure returns (string memory); function symbol() external pure returns (string memory); function decimals() external pure returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom( address from, address to, uint value ) external returns (bool); function DOMAIN_SEPARATOR() external view returns (bytes32); function PERMIT_TYPEHASH() external pure returns (bytes32); function nonces(address owner) external view returns (uint); function permit( address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s ) external; event Mint(address indexed sender, uint amount0, uint amount1); event Burn(address indexed sender, uint amount0, uint amount1, address indexed to); event Swap( address indexed sender, uint amount0In, uint amount1In, uint amount0Out, uint amount1Out, address indexed to ); event Sync(uint112 reserve0, uint112 reserve1); function MINIMUM_LIQUIDITY() external pure returns (uint); function factory() external view returns (address); function token0() external view returns (address); function token1() external view returns (address); function getReserves() external view returns ( uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast ); function price0CumulativeLast() external view returns (uint); function price1CumulativeLast() external view returns (uint); function kLast() external view returns (uint); function mint(address to) external returns (uint liquidity); function burn(address to) external returns (uint amount0, uint amount1); function swap( uint amount0Out, uint amount1Out, address to, bytes calldata data ) external; function skim(address to) external; function sync() external; function initialize(address, address) external; }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/IERC1155.sol'; import './IERC20Wrapper.sol'; interface IWStakingRewards is IERC1155, IERC20Wrapper { /// @dev Mint ERC1155 token for the given ERC20 token. function mint(uint amount) external returns (uint id); /// @dev Burn ERC1155 token to redeem ERC20 token back. function burn(uint id, uint amount) external returns (uint); function reward() external returns (address); }
pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import './BasicSpell.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/ICurvePool.sol'; import '../../interfaces/ICurveRegistry.sol'; import '../../interfaces/IWLiquidityGauge.sol'; import '../../interfaces/IWERC20.sol'; contract CurveSpellV1 is BasicSpell { using SafeMath for uint; using HomoraMath for uint; ICurveRegistry public immutable registry; IWLiquidityGauge public immutable wgauge; address public immutable crv; mapping(address => address[]) public ulTokens; // lpToken -> underlying token array mapping(address => address) public poolOf; // lpToken -> pool constructor( IBank _bank, address _werc20, address _weth, address _wgauge ) public BasicSpell(_bank, _werc20, _weth) { wgauge = IWLiquidityGauge(_wgauge); IWLiquidityGauge(_wgauge).setApprovalForAll(address(_bank), true); registry = IWLiquidityGauge(_wgauge).registry(); crv = address(IWLiquidityGauge(_wgauge).crv()); } /// @dev Return pool address given LP token and update pool info if not exist. /// @param lp LP token to find the corresponding pool. function getPool(address lp) public returns (address) { address pool = poolOf[lp]; if (pool == address(0)) { require(lp != address(0), 'no lp token'); pool = registry.get_pool_from_lp_token(lp); require(pool != address(0), 'no corresponding pool for lp token'); poolOf[lp] = pool; uint n = registry.get_n_coins(pool); address[8] memory tokens = registry.get_coins(pool); ulTokens[lp] = new address[](n); for (uint i = 0; i < n; i++) { ulTokens[lp][i] = tokens[i]; } } return pool; } function ensureApproveN(address lp, uint n) public { require(ulTokens[lp].length == n, 'incorrect pool length'); address pool = poolOf[lp]; address[] memory tokens = ulTokens[lp]; for (uint idx = 0; idx < n; idx++) { ensureApprove(tokens[idx], pool); } } /// @dev add liquidity for pools with 2 underlying tokens function addLiquidity2( address lp, uint[2] calldata amtsUser, uint amtLPUser, uint[2] calldata amtsBorrow, uint amtLPBorrow, uint minLPMint, uint pid, uint gid ) external payable { address pool = getPool(lp); require(ulTokens[lp].length == 2, 'incorrect pool length'); require(wgauge.getUnderlyingToken(wgauge.encodeId(pid, gid, 0)) == lp, 'incorrect underlying'); address[] memory tokens = ulTokens[lp]; // 0. Take out collateral uint positionId = bank.POSITION_ID(); (, , uint collId, uint collSize) = bank.getPositionInfo(positionId); if (collSize > 0) { (uint decodedPid, uint decodedGid, ) = wgauge.decodeId(collId); require(decodedPid == pid && decodedGid == gid, 'incorrect coll id'); bank.takeCollateral(address(wgauge), collId, collSize); wgauge.burn(collId, collSize); } // 1. Ensure approve 2 underlying tokens ensureApproveN(lp, 2); // 2. Get user input amounts for (uint i = 0; i < 2; i++) doTransmit(tokens[i], amtsUser[i]); doTransmit(lp, amtLPUser); // 3. Borrow specified amounts for (uint i = 0; i < 2; i++) doBorrow(tokens[i], amtsBorrow[i]); doBorrow(lp, amtLPBorrow); // 4. add liquidity uint[2] memory suppliedAmts; for (uint i = 0; i < 2; i++) { suppliedAmts[i] = IERC20(tokens[i]).balanceOf(address(this)); } ICurvePool(pool).add_liquidity(suppliedAmts, minLPMint); // 5. Put collateral uint amount = IERC20(lp).balanceOf(address(this)); ensureApprove(lp, address(wgauge)); uint id = wgauge.mint(pid, gid, amount); bank.putCollateral(address(wgauge), id, amount); // 6. Refund for (uint i = 0; i < 2; i++) doRefund(tokens[i]); // 7. Refund crv doRefund(crv); } /// @dev add liquidity for pools with 3 underlying tokens function addLiquidity3( address lp, uint[3] calldata amtsUser, uint amtLPUser, uint[3] calldata amtsBorrow, uint amtLPBorrow, uint minLPMint, uint pid, uint gid ) external payable { address pool = getPool(lp); require(ulTokens[lp].length == 3, 'incorrect pool length'); require(wgauge.getUnderlyingToken(wgauge.encodeId(pid, gid, 0)) == lp, 'incorrect underlying'); address[] memory tokens = ulTokens[lp]; // 0. take out collateral uint positionId = bank.POSITION_ID(); (, , uint collId, uint collSize) = bank.getPositionInfo(positionId); if (collSize > 0) { (uint decodedPid, uint decodedGid, ) = wgauge.decodeId(collId); require(decodedPid == pid && decodedGid == gid, 'incorrect coll id'); bank.takeCollateral(address(wgauge), collId, collSize); wgauge.burn(collId, collSize); } // 1. Ensure approve 3 underlying tokens ensureApproveN(lp, 3); // 2. Get user input amounts for (uint i = 0; i < 3; i++) doTransmit(tokens[i], amtsUser[i]); doTransmit(lp, amtLPUser); // 3. Borrow specified amounts for (uint i = 0; i < 3; i++) doBorrow(tokens[i], amtsBorrow[i]); doBorrow(lp, amtLPBorrow); // 4. add liquidity uint[3] memory suppliedAmts; for (uint i = 0; i < 3; i++) { suppliedAmts[i] = IERC20(tokens[i]).balanceOf(address(this)); } ICurvePool(pool).add_liquidity(suppliedAmts, minLPMint); // 5. put collateral uint amount = IERC20(lp).balanceOf(address(this)); ensureApprove(lp, address(wgauge)); uint id = wgauge.mint(pid, gid, amount); bank.putCollateral(address(wgauge), id, amount); // 6. Refund for (uint i = 0; i < 3; i++) doRefund(tokens[i]); // 7. Refund crv doRefund(crv); } /// @dev add liquidity for pools with 4 underlying tokens function addLiquidity4( address lp, uint[4] calldata amtsUser, uint amtLPUser, uint[4] calldata amtsBorrow, uint amtLPBorrow, uint minLPMint, uint pid, uint gid ) external payable { address pool = getPool(lp); require(ulTokens[lp].length == 4, 'incorrect pool length'); require(wgauge.getUnderlyingToken(wgauge.encodeId(pid, gid, 0)) == lp, 'incorrect underlying'); address[] memory tokens = ulTokens[lp]; // 0. Take out collateral uint positionId = bank.POSITION_ID(); (, , uint collId, uint collSize) = bank.getPositionInfo(positionId); if (collSize > 0) { (uint decodedPid, uint decodedGid, ) = wgauge.decodeId(collId); require(decodedPid == pid && decodedGid == gid, 'incorrect coll id'); bank.takeCollateral(address(wgauge), collId, collSize); wgauge.burn(collId, collSize); } // 1. Ensure approve 4 underlying tokens ensureApproveN(lp, 4); // 2. Get user input amounts for (uint i = 0; i < 4; i++) doTransmit(tokens[i], amtsUser[i]); doTransmit(lp, amtLPUser); // 3. Borrow specified amounts for (uint i = 0; i < 4; i++) doBorrow(tokens[i], amtsBorrow[i]); doBorrow(lp, amtLPBorrow); // 4. add liquidity uint[4] memory suppliedAmts; for (uint i = 0; i < 4; i++) { suppliedAmts[i] = IERC20(tokens[i]).balanceOf(address(this)); } ICurvePool(pool).add_liquidity(suppliedAmts, minLPMint); // 5. Put collateral uint amount = IERC20(lp).balanceOf(address(this)); ensureApprove(lp, address(wgauge)); uint id = wgauge.mint(pid, gid, amount); bank.putCollateral(address(wgauge), id, amount); // 6. Refund for (uint i = 0; i < 4; i++) doRefund(tokens[i]); // 7. Refund crv doRefund(crv); } function removeLiquidity2( address lp, uint amtLPTake, uint amtLPWithdraw, uint[2] calldata amtsRepay, uint amtLPRepay, uint[2] calldata amtsMin ) external payable { address pool = getPool(lp); uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, ) = bank.getPositionInfo(positionId); require(IWLiquidityGauge(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); address[] memory tokens = ulTokens[lp]; // 0. Ensure approve ensureApproveN(lp, 2); // 1. Compute repay amount if MAX_INT is supplied (max debt) uint[2] memory actualAmtsRepay; for (uint i = 0; i < 2; i++) { actualAmtsRepay[i] = amtsRepay[i] == uint(-1) ? bank.borrowBalanceCurrent(positionId, tokens[i]) : amtsRepay[i]; } uint[2] memory amtsDesired; for (uint i = 0; i < 2; i++) { amtsDesired[i] = actualAmtsRepay[i].add(amtsMin[i]); // repay amt + slippage control } // 2. Take out collateral bank.takeCollateral(address(wgauge), collId, amtLPTake); wgauge.burn(collId, amtLPTake); // 3. Compute amount to actually remove. Remove to repay just enough uint amtLPToRemove; if (amtsDesired[0] > 0 || amtsDesired[1] > 0) { amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amtLPWithdraw); ICurvePool(pool).remove_liquidity_imbalance(amtsDesired, amtLPToRemove); } // 4. Compute leftover amount to remove. Remove balancedly. amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amtLPWithdraw); uint[2] memory mins; ICurvePool(pool).remove_liquidity(amtLPToRemove, mins); // 5. Repay for (uint i = 0; i < 2; i++) { doRepay(tokens[i], actualAmtsRepay[i]); } doRepay(lp, amtLPRepay); // 6. Refund for (uint i = 0; i < 2; i++) { doRefund(tokens[i]); } doRefund(lp); // 7. Refund crv doRefund(crv); } function removeLiquidity3( address lp, uint amtLPTake, uint amtLPWithdraw, uint[3] calldata amtsRepay, uint amtLPRepay, uint[3] calldata amtsMin ) external payable { address pool = getPool(lp); uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, ) = bank.getPositionInfo(positionId); require(IWLiquidityGauge(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); address[] memory tokens = ulTokens[lp]; // 0. Ensure approve ensureApproveN(lp, 3); // 1. Compute repay amount if MAX_INT is supplied (max debt) uint[3] memory actualAmtsRepay; for (uint i = 0; i < 3; i++) { actualAmtsRepay[i] = amtsRepay[i] == uint(-1) ? bank.borrowBalanceCurrent(positionId, tokens[i]) : amtsRepay[i]; } uint[3] memory amtsDesired; for (uint i = 0; i < 3; i++) { amtsDesired[i] = actualAmtsRepay[i].add(amtsMin[i]); // repay amt + slippage control } // 2. Take out collateral bank.takeCollateral(address(wgauge), collId, amtLPTake); wgauge.burn(collId, amtLPTake); // 3. Compute amount to actually remove. Remove to repay just enough uint amtLPToRemove; if (amtsDesired[0] > 0 || amtsDesired[1] > 0 || amtsDesired[2] > 0) { amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amtLPWithdraw); ICurvePool(pool).remove_liquidity_imbalance(amtsDesired, amtLPToRemove); } // 4. Compute leftover amount to remove. Remove balancedly. amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amtLPWithdraw); uint[3] memory mins; ICurvePool(pool).remove_liquidity(amtLPToRemove, mins); // 5. Repay for (uint i = 0; i < 3; i++) { doRepay(tokens[i], actualAmtsRepay[i]); } doRepay(lp, amtLPRepay); // 6. Refund for (uint i = 0; i < 3; i++) { doRefund(tokens[i]); } doRefund(lp); // 7. Refund crv doRefund(crv); } function removeLiquidity4( address lp, uint amtLPTake, uint amtLPWithdraw, uint[4] calldata amtsRepay, uint amtLPRepay, uint[4] calldata amtsMin ) external payable { address pool = getPool(lp); uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, ) = bank.getPositionInfo(positionId); require(IWLiquidityGauge(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); address[] memory tokens = ulTokens[lp]; // 0. Ensure approve ensureApproveN(lp, 4); // 1. Compute repay amount if MAX_INT is supplied (max debt) uint[4] memory actualAmtsRepay; for (uint i = 0; i < 4; i++) { actualAmtsRepay[i] = amtsRepay[i] == uint(-1) ? bank.borrowBalanceCurrent(positionId, tokens[i]) : amtsRepay[i]; } uint[4] memory amtsDesired; for (uint i = 0; i < 4; i++) { amtsDesired[i] = actualAmtsRepay[i].add(amtsMin[i]); // repay amt + slippage control } // 2. Take out collateral bank.takeCollateral(address(wgauge), collId, amtLPTake); wgauge.burn(collId, amtLPTake); // 3. Compute amount to actually remove. Remove to repay just enough uint amtLPToRemove; if (amtsDesired[0] > 0 || amtsDesired[1] > 0 || amtsDesired[2] > 0 || amtsDesired[3] > 0) { amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amtLPWithdraw); ICurvePool(pool).remove_liquidity_imbalance(amtsDesired, amtLPToRemove); } // 4. Compute leftover amount to remove. Remove balancedly. amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amtLPWithdraw); uint[4] memory mins; ICurvePool(pool).remove_liquidity(amtLPToRemove, mins); // 5. Repay for (uint i = 0; i < 4; i++) { doRepay(tokens[i], actualAmtsRepay[i]); } doRepay(lp, amtLPRepay); // 6. Refund for (uint i = 0; i < 4; i++) { doRefund(tokens[i]); } doRefund(lp); // 7. Refund crv doRefund(crv); } function harvest() external { uint positionId = bank.POSITION_ID(); (, , uint collId, uint collSize) = bank.getPositionInfo(positionId); (uint pid, uint gid, ) = wgauge.decodeId(collId); address lp = wgauge.getUnderlyingToken(collId); // 1. Take out collateral bank.takeCollateral(address(wgauge), collId, collSize); wgauge.burn(collId, collSize); // 2. Put collateral uint amount = IERC20(lp).balanceOf(address(this)); ensureApprove(lp, address(wgauge)); uint id = wgauge.mint(pid, gid, amount); bank.putCollateral(address(wgauge), id, amount); // 3. Refund crv doRefund(crv); } }
pragma solidity 0.6.12; interface ICurvePool { function add_liquidity(uint[2] calldata, uint) external; function add_liquidity(uint[3] calldata, uint) external; function add_liquidity(uint[4] calldata, uint) external; function remove_liquidity(uint, uint[2] calldata) external; function remove_liquidity(uint, uint[3] calldata) external; function remove_liquidity(uint, uint[4] calldata) external; function remove_liquidity_imbalance(uint[2] calldata, uint) external; function remove_liquidity_imbalance(uint[3] calldata, uint) external; function remove_liquidity_imbalance(uint[4] calldata, uint) external; function remove_liquidity_one_coin( uint, int128, uint ) external; function get_virtual_price() external view returns (uint); }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/IERC1155.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import './IERC20Wrapper.sol'; import './ICurveRegistry.sol'; import './ILiquidityGauge.sol'; interface IWLiquidityGauge is IERC1155, IERC20Wrapper { /// @dev Mint ERC1155 token for the given ERC20 token. function mint( uint pid, uint gid, uint amount ) external returns (uint id); /// @dev Burn ERC1155 token to redeem ERC20 token back. function burn(uint id, uint amount) external returns (uint pid); function crv() external returns (IERC20); function registry() external returns (ICurveRegistry); function encodeId( uint, uint, uint ) external pure returns (uint); function decodeId(uint id) external pure returns ( uint, uint, uint ); }
pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import './BasicSpell.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/IUniswapV2Factory.sol'; import '../../interfaces/IUniswapV2Router02.sol'; import '../../interfaces/IUniswapV2Pair.sol'; import '../../interfaces/IWMasterChef.sol'; contract SushiswapSpellV1 is BasicSpell { using SafeMath for uint; using HomoraMath for uint; IUniswapV2Factory public factory; IUniswapV2Router02 public router; mapping(address => mapping(address => address)) public pairs; IWMasterChef public immutable wmasterchef; address public immutable sushi; constructor( IBank _bank, address _werc20, IUniswapV2Router02 _router, address _wmasterchef ) public BasicSpell(_bank, _werc20, _router.WETH()) { router = _router; factory = IUniswapV2Factory(_router.factory()); wmasterchef = IWMasterChef(_wmasterchef); IWMasterChef(_wmasterchef).setApprovalForAll(address(_bank), true); sushi = address(IWMasterChef(_wmasterchef).sushi()); } function getPair(address tokenA, address tokenB) public returns (address) { address lp = pairs[tokenA][tokenB]; if (lp == address(0)) { lp = factory.getPair(tokenA, tokenB); require(lp != address(0), 'no lp token'); ensureApprove(tokenA, address(router)); ensureApprove(tokenB, address(router)); ensureApprove(lp, address(router)); pairs[tokenA][tokenB] = lp; pairs[tokenB][tokenA] = lp; } return lp; } /// @dev Compute optimal deposit amount /// @param amtA amount of token A desired to deposit /// @param amtB amount of token B desired to deposit /// @param resA amount of token A in reserve /// @param resB amount of token B in reserve function optimalDeposit( uint amtA, uint amtB, uint resA, uint resB ) internal pure returns (uint swapAmt, bool isReversed) { if (amtA.mul(resB) >= amtB.mul(resA)) { swapAmt = _optimalDepositA(amtA, amtB, resA, resB); isReversed = false; } else { swapAmt = _optimalDepositA(amtB, amtA, resB, resA); isReversed = true; } } /// @dev Compute optimal deposit amount helper. /// @param amtA amount of token A desired to deposit /// @param amtB amount of token B desired to deposit /// @param resA amount of token A in reserve /// @param resB amount of token B in reserve /// Formula: https://blog.alphafinance.io/byot/ function _optimalDepositA( uint amtA, uint amtB, uint resA, uint resB ) internal pure returns (uint) { require(amtA.mul(resB) >= amtB.mul(resA), 'Reversed'); uint a = 997; uint b = uint(1997).mul(resA); uint _c = (amtA.mul(resB)).sub(amtB.mul(resA)); uint c = _c.mul(1000).div(amtB.add(resB)).mul(resA); uint d = a.mul(c).mul(4); uint e = HomoraMath.sqrt(b.mul(b).add(d)); uint numerator = e.sub(b); uint denominator = a.mul(2); return numerator.div(denominator); } struct Amounts { uint amtAUser; uint amtBUser; uint amtLPUser; uint amtABorrow; uint amtBBorrow; uint amtLPBorrow; uint amtAMin; uint amtBMin; } function addLiquidityInternal( address tokenA, address tokenB, Amounts calldata amt ) internal { address lp = getPair(tokenA, tokenB); // 1. Get user input amounts doTransmitETH(); doTransmit(tokenA, amt.amtAUser); doTransmit(tokenB, amt.amtBUser); doTransmit(lp, amt.amtLPUser); // 2. Borrow specified amounts doBorrow(tokenA, amt.amtABorrow); doBorrow(tokenB, amt.amtBBorrow); doBorrow(lp, amt.amtLPBorrow); // 3. Calculate optimal swap amount uint swapAmt; bool isReversed; { uint amtA = IERC20(tokenA).balanceOf(address(this)); uint amtB = IERC20(tokenB).balanceOf(address(this)); uint resA; uint resB; if (IUniswapV2Pair(lp).token0() == tokenA) { (resA, resB, ) = IUniswapV2Pair(lp).getReserves(); } else { (resB, resA, ) = IUniswapV2Pair(lp).getReserves(); } (swapAmt, isReversed) = optimalDeposit(amtA, amtB, resA, resB); } // 4. Swap optimal amount { address[] memory path = new address[](2); (path[0], path[1]) = isReversed ? (tokenB, tokenA) : (tokenA, tokenB); router.swapExactTokensForTokens(swapAmt, 0, path, address(this), now); } // 5. Add liquidity router.addLiquidity( tokenA, tokenB, IERC20(tokenA).balanceOf(address(this)), IERC20(tokenB).balanceOf(address(this)), amt.amtAMin, amt.amtBMin, address(this), now ); } function addLiquidityWERC20( address tokenA, address tokenB, Amounts calldata amt ) external payable { address lp = getPair(tokenA, tokenB); // 1-5. add liquidity addLiquidityInternal(tokenA, tokenB, amt); // 6. Put collateral doPutCollateral(lp, IERC20(lp).balanceOf(address(this))); // 7. Refund leftovers to users doRefundETH(); doRefund(tokenA); doRefund(tokenB); } function addLiquidityWMasterChef( address tokenA, address tokenB, Amounts calldata amt, uint pid ) external payable { address lp = getPair(tokenA, tokenB); (address lpToken, , , ) = wmasterchef.chef().poolInfo(pid); require(lpToken == lp, 'incorrect lp token'); // 1-5. add liquidity addLiquidityInternal(tokenA, tokenB, amt); // 6. Take out collateral uint positionId = bank.POSITION_ID(); (, , uint collId, uint collSize) = bank.getPositionInfo(positionId); if (collSize > 0) { (uint decodedPid, ) = wmasterchef.decodeId(collId); require(pid == decodedPid, 'incorrect pid'); bank.takeCollateral(address(wmasterchef), collId, collSize); wmasterchef.burn(collId, collSize); } // 7. Put collateral ensureApprove(lp, address(wmasterchef)); uint amount = IERC20(lp).balanceOf(address(this)); uint id = wmasterchef.mint(pid, amount); bank.putCollateral(address(wmasterchef), id, amount); // 8. Refund leftovers to users doRefundETH(); doRefund(tokenA); doRefund(tokenB); // 9. Refund sushi doRefund(sushi); } struct RepayAmounts { uint amtLPTake; uint amtLPWithdraw; uint amtARepay; uint amtBRepay; uint amtLPRepay; uint amtAMin; uint amtBMin; } function removeLiquidityInternal( address tokenA, address tokenB, RepayAmounts calldata amt ) internal { address lp = getPair(tokenA, tokenB); uint positionId = bank.POSITION_ID(); uint amtARepay = amt.amtARepay; uint amtBRepay = amt.amtBRepay; uint amtLPRepay = amt.amtLPRepay; // 2. Compute repay amount if MAX_INT is supplied (max debt) if (amtARepay == uint(-1)) { amtARepay = bank.borrowBalanceCurrent(positionId, tokenA); } if (amtBRepay == uint(-1)) { amtBRepay = bank.borrowBalanceCurrent(positionId, tokenB); } if (amtLPRepay == uint(-1)) { amtLPRepay = bank.borrowBalanceCurrent(positionId, lp); } // 3. Compute amount to actually remove uint amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amt.amtLPWithdraw); // 4. Remove liquidity (uint amtA, uint amtB) = router.removeLiquidity(tokenA, tokenB, amtLPToRemove, 0, 0, address(this), now); // 5. MinimizeTrading uint amtADesired = amtARepay.add(amt.amtAMin); uint amtBDesired = amtBRepay.add(amt.amtBMin); if (amtA < amtADesired && amtB >= amtBDesired) { address[] memory path = new address[](2); (path[0], path[1]) = (tokenB, tokenA); router.swapTokensForExactTokens( amtADesired.sub(amtA), amtB.sub(amtBDesired), path, address(this), now ); } else if (amtA >= amtADesired && amtB < amtBDesired) { address[] memory path = new address[](2); (path[0], path[1]) = (tokenA, tokenB); router.swapTokensForExactTokens( amtBDesired.sub(amtB), amtA.sub(amtADesired), path, address(this), now ); } // 6. Repay doRepay(tokenA, amtARepay); doRepay(tokenB, amtBRepay); doRepay(lp, amtLPRepay); // 7. Slippage control require(IERC20(tokenA).balanceOf(address(this)) >= amt.amtAMin); require(IERC20(tokenB).balanceOf(address(this)) >= amt.amtBMin); require(IERC20(lp).balanceOf(address(this)) >= amt.amtLPWithdraw); // 8. Refund leftover doRefundETH(); doRefund(tokenA); doRefund(tokenB); doRefund(lp); } function removeLiquidityWERC20( address tokenA, address tokenB, RepayAmounts calldata amt ) external { address lp = getPair(tokenA, tokenB); // 1. Take out collateral doTakeCollateral(lp, amt.amtLPTake); // 2-8. remove liquidity removeLiquidityInternal(tokenA, tokenB, amt); } function removeLiquidityWMasterChef( address tokenA, address tokenB, RepayAmounts calldata amt ) external { address lp = getPair(tokenA, tokenB); uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, ) = bank.getPositionInfo(positionId); require(IWMasterChef(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); // 1. Take out collateral bank.takeCollateral(address(wmasterchef), collId, amt.amtLPTake); wmasterchef.burn(collId, amt.amtLPTake); // 2-8. remove liquidity removeLiquidityInternal(tokenA, tokenB, amt); // 9. Refund sushi doRefund(sushi); } function harvestWMasterChef() external { uint positionId = bank.POSITION_ID(); (, , uint collId, ) = bank.getPositionInfo(positionId); (uint pid, ) = wmasterchef.decodeId(collId); address lp = wmasterchef.getUnderlyingToken(collId); // 1. Take out collateral bank.takeCollateral(address(wmasterchef), collId, uint(-1)); wmasterchef.burn(collId, uint(-1)); // 2. put collateral uint amount = IERC20(lp).balanceOf(address(this)); ensureApprove(lp, address(wmasterchef)); uint id = wmasterchef.mint(pid, amount); bank.putCollateral(address(wmasterchef), id, amount); // 3. Refund sushi doRefund(sushi); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/IERC1155.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import './IERC20Wrapper.sol'; import './IMasterChef.sol'; interface IWMasterChef is IERC1155, IERC20Wrapper { /// @dev Mint ERC1155 token for the given ERC20 token. function mint(uint pid, uint amount) external returns (uint id); /// @dev Burn ERC1155 token to redeem ERC20 token back. function burn(uint id, uint amount) external returns (uint pid); function sushi() external returns (IERC20); function decodeId(uint id) external pure returns (uint, uint); function chef() external view returns (IMasterChef); }
pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import './BasicSpell.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/IBalancerPool.sol'; import '../../interfaces/IWStakingRewards.sol'; contract BalancerSpellV1 is BasicSpell { using SafeMath for uint; using HomoraMath for uint; mapping(address => address[2]) pairs; // mapping from lp token to underlying token (only pairs) constructor( IBank _bank, address _werc20, address _weth ) public BasicSpell(_bank, _werc20, _weth) {} function getPair(address lp) public returns (address tokenA, address tokenB) { address[2] memory ulTokens = pairs[lp]; tokenA = ulTokens[0]; tokenB = ulTokens[1]; if (tokenA == address(0) || tokenB == address(0)) { address[] memory tokens = IBalancerPool(lp).getFinalTokens(); require(tokens.length == 2, 'underlying tokens not 2'); tokenA = tokens[0]; tokenB = tokens[1]; ensureApprove(tokenA, lp); ensureApprove(tokenB, lp); } } struct Amounts { uint amtAUser; uint amtBUser; uint amtLPUser; uint amtABorrow; uint amtBBorrow; uint amtLPBorrow; uint amtLPDesired; } function addLiquidityInternal(address lp, Amounts calldata amt) internal { (address tokenA, address tokenB) = getPair(lp); // 1. Get user input amounts doTransmitETH(); doTransmit(tokenA, amt.amtAUser); doTransmit(tokenB, amt.amtBUser); doTransmit(lp, amt.amtLPUser); // 2. Borrow specified amounts doBorrow(tokenA, amt.amtABorrow); doBorrow(tokenB, amt.amtBBorrow); doBorrow(lp, amt.amtLPBorrow); // 3.1 Add Liquidity using equal value two side to minimize swap fee uint[] memory maxAmountsIn = new uint[](2); maxAmountsIn[0] = amt.amtAUser.add(amt.amtABorrow); maxAmountsIn[1] = amt.amtBUser.add(amt.amtBBorrow); uint totalLPSupply = IBalancerPool(lp).totalSupply(); uint poolAmountFromA = maxAmountsIn[0].mul(1e18).div(IBalancerPool(lp).getBalance(tokenA)).mul(totalLPSupply).div( 1e18 ); // compute in reverse order of how Balancer's `joinPool` computes tokenAmountIn uint poolAmountFromB = maxAmountsIn[1].mul(1e18).div(IBalancerPool(lp).getBalance(tokenB)).mul(totalLPSupply).div( 1e18 ); // compute in reverse order of how Balancer's `joinPool` computes tokenAmountIn uint poolAmountOut = poolAmountFromA > poolAmountFromB ? poolAmountFromB : poolAmountFromA; if (poolAmountOut > 0) IBalancerPool(lp).joinPool(poolAmountOut, maxAmountsIn); // 3.2 Add Liquidity leftover for each token uint ABal = IERC20(tokenA).balanceOf(address(this)); uint BBal = IERC20(tokenB).balanceOf(address(this)); if (ABal > 0) IBalancerPool(lp).joinswapExternAmountIn(tokenA, ABal, 0); if (BBal > 0) IBalancerPool(lp).joinswapExternAmountIn(tokenB, BBal, 0); // 4. Slippage control uint lpBalance = IERC20(lp).balanceOf(address(this)); require(lpBalance >= amt.amtLPDesired, 'lp desired not met'); } /// @dev Add liquidity to Balancer pool (with 2 underlying tokens) function addLiquidityWERC20(address lp, Amounts calldata amt) external payable { // 1-4. add liquidity addLiquidityInternal(lp, amt); // 5. Put collateral doPutCollateral(lp, IERC20(lp).balanceOf(address(this))); // 6. Refund leftovers to users (address tokenA, address tokenB) = getPair(lp); doRefundETH(); doRefund(tokenA); doRefund(tokenB); } /// @dev Add liquidity to Balancer pool (with 2 underlying tokens) function addLiquidityWStakingRewards( address lp, Amounts calldata amt, address wstaking ) external payable { // 1-4. add liquidity addLiquidityInternal(lp, amt); // 5. Take out collateral uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, uint collSize) = bank.getPositionInfo(positionId); if (collSize > 0) { require(IWStakingRewards(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); bank.takeCollateral(wstaking, collId, collSize); IWStakingRewards(wstaking).burn(collId, collSize); } // 6. Put collateral ensureApprove(lp, wstaking); uint amount = IERC20(lp).balanceOf(address(this)); uint id = IWStakingRewards(wstaking).mint(amount); if (!IWStakingRewards(wstaking).isApprovedForAll(address(this), address(bank))) { IWStakingRewards(wstaking).setApprovalForAll(address(bank), true); } bank.putCollateral(address(wstaking), id, amount); // 7. Refund leftovers to users (address tokenA, address tokenB) = getPair(lp); doRefundETH(); doRefund(tokenA); doRefund(tokenB); // 8. Refund reward doRefund(IWStakingRewards(wstaking).reward()); } struct RepayAmounts { uint amtLPTake; uint amtLPWithdraw; uint amtARepay; uint amtBRepay; uint amtLPRepay; uint amtAMin; uint amtBMin; } function removeLiquidityInternal(address lp, RepayAmounts calldata amt) internal { (address tokenA, address tokenB) = getPair(lp); uint amtARepay = amt.amtARepay; uint amtBRepay = amt.amtBRepay; uint amtLPRepay = amt.amtLPRepay; // 2. Compute repay amount if MAX_INT is supplied (max debt) { uint positionId = bank.POSITION_ID(); if (amtARepay == uint(-1)) { amtARepay = bank.borrowBalanceCurrent(positionId, tokenA); } if (amtBRepay == uint(-1)) { amtBRepay = bank.borrowBalanceCurrent(positionId, tokenB); } if (amtLPRepay == uint(-1)) { amtLPRepay = bank.borrowBalanceCurrent(positionId, lp); } } // 3.1 Remove liquidity 2 sides uint amtLPToRemove = IERC20(lp).balanceOf(address(this)).sub(amt.amtLPWithdraw); uint[] memory minAmountsOut = new uint[](2); IBalancerPool(lp).exitPool(amtLPToRemove, minAmountsOut); // 3.2 Minimize trading uint amtADesired = amtARepay.add(amt.amtAMin); uint amtBDesired = amtBRepay.add(amt.amtBMin); uint amtA = IERC20(tokenA).balanceOf(address(this)); uint amtB = IERC20(tokenB).balanceOf(address(this)); if (amtA < amtADesired && amtB >= amtBDesired) { IBalancerPool(lp).swapExactAmountOut( tokenB, amtB.sub(amtBDesired), tokenA, amtADesired.sub(amtA), uint(-1) ); } else if (amtA >= amtADesired && amtB < amtBDesired) { IBalancerPool(lp).swapExactAmountOut( tokenA, amtA.sub(amtADesired), tokenB, amtBDesired.sub(amtB), uint(-1) ); } // 4. Repay doRepay(tokenA, amtARepay); doRepay(tokenB, amtBRepay); doRepay(lp, amtLPRepay); // 5. Slippage control require(IERC20(tokenA).balanceOf(address(this)) >= amt.amtAMin); require(IERC20(tokenB).balanceOf(address(this)) >= amt.amtBMin); require(IERC20(lp).balanceOf(address(this)) >= amt.amtLPWithdraw); // 6. Refund leftover doRefundETH(); doRefund(tokenA); doRefund(tokenB); doRefund(lp); } function removeLiquidityWERC20(address lp, RepayAmounts calldata amt) external { // 1. Take out collateral doTakeCollateral(lp, amt.amtLPTake); // 2-6. remove liquidity removeLiquidityInternal(lp, amt); } function removeLiquidityWStakingRewards( address lp, RepayAmounts calldata amt, address wstaking ) external { uint positionId = bank.POSITION_ID(); (, address collToken, uint collId, ) = bank.getPositionInfo(positionId); // 1. Take out collateral require(IWStakingRewards(collToken).getUnderlyingToken(collId) == lp, 'incorrect underlying'); bank.takeCollateral(wstaking, collId, amt.amtLPTake); IWStakingRewards(wstaking).burn(collId, amt.amtLPTake); // 2-6. remove liquidity removeLiquidityInternal(lp, amt); // 7. Refund reward doRefund(IWStakingRewards(wstaking).reward()); } function harvestWStakingRewards(address wstaking) external { uint positionId = bank.POSITION_ID(); (, , uint collId, ) = bank.getPositionInfo(positionId); address lp = IWStakingRewards(wstaking).getUnderlyingToken(collId); // 1. Take out collateral bank.takeCollateral(wstaking, collId, uint(-1)); IWStakingRewards(wstaking).burn(collId, uint(-1)); // 2. put collateral uint amount = IERC20(lp).balanceOf(address(this)); ensureApprove(lp, wstaking); uint id = IWStakingRewards(wstaking).mint(amount); bank.putCollateral(wstaking, id, amount); // 3. Refund reward doRefund(IWStakingRewards(wstaking).reward()); } }
pragma solidity 0.6.12; interface IBalancerPool { function getFinalTokens() external view returns (address[] memory); function getNormalizedWeight(address token) external view returns (uint); function getSwapFee() external view returns (uint); function getNumTokens() external view returns (uint); function getBalance(address token) external view returns (uint); function totalSupply() external view returns (uint); function joinPool(uint poolAmountOut, uint[] calldata maxAmountsIn) external; function swapExactAmountOut( address tokenIn, uint maxAmountIn, address tokenOut, uint tokenAmountOut, uint maxPrice ) external returns (uint tokenAmountIn, uint spotPriceAfter); function joinswapExternAmountIn( address tokenIn, uint tokenAmountIn, uint minPoolAmountOut ) external returns (uint poolAmountOut); function exitPool(uint poolAmoutnIn, uint[] calldata minAmountsOut) external; function exitswapExternAmountOut( address tokenOut, uint tokenAmountOut, uint maxPoolAmountIn ) external returns (uint poolAmountIn); }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import './BasicSpell.sol'; import '../../interfaces/IBank.sol'; import '../../interfaces/IWETH.sol'; contract HouseHoldSpell is BasicSpell { constructor( IBank _bank, address _werc20, address _weth ) public BasicSpell(_bank, _werc20, _weth) {} function borrowETH(uint amount) external { doBorrow(weth, amount); doRefundETH(); } function borrow(address token, uint amount) external { doBorrow(token, amount); doRefund(token); } function repayETH(uint amount) external payable { doTransmitETH(); doRepay(weth, amount); } function repay(address token, uint amount) external { doTransmit(token, amount); doRepay(token, IERC20(token).balanceOf(address(this))); } function putCollateral(address token, uint amount) external { doTransmit(token, amount); doPutCollateral(token, IERC20(token).balanceOf(address(this))); } function takeCollateral(address token, uint amount) external { doTakeCollateral(token, amount); doRefund(token); } }
pragma solidity 0.6.12; interface MockUniswapV2FactoryIUniswapV2Factory { event PairCreated(address indexed token0, address indexed token1, address pair, uint); function feeTo() external view returns (address); function feeToSetter() external view returns (address); function getPair(address tokenA, address tokenB) external view returns (address pair); function allPairs(uint) external view returns (address pair); function allPairsLength() external view returns (uint); function createPair(address tokenA, address tokenB) external returns (address pair); function setFeeTo(address) external; function setFeeToSetter(address) external; } interface MockUniswapV2FactoryIUniswapV2Pair { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external pure returns (string memory); function symbol() external pure returns (string memory); function decimals() external pure returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom( address from, address to, uint value ) external returns (bool); function DOMAIN_SEPARATOR() external view returns (bytes32); function PERMIT_TYPEHASH() external pure returns (bytes32); function nonces(address owner) external view returns (uint); function permit( address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s ) external; event Mint(address indexed sender, uint amount0, uint amount1); event Burn(address indexed sender, uint amount0, uint amount1, address indexed to); event Swap( address indexed sender, uint amount0In, uint amount1In, uint amount0Out, uint amount1Out, address indexed to ); event Sync(uint112 reserve0, uint112 reserve1); function MINIMUM_LIQUIDITY() external pure returns (uint); function factory() external view returns (address); function token0() external view returns (address); function token1() external view returns (address); function getReserves() external view returns ( uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast ); function price0CumulativeLast() external view returns (uint); function price1CumulativeLast() external view returns (uint); function kLast() external view returns (uint); function mint(address to) external returns (uint liquidity); function burn(address to) external returns (uint amount0, uint amount1); function swap( uint amount0Out, uint amount1Out, address to, bytes calldata data ) external; function skim(address to) external; function sync() external; function initialize(address, address) external; } interface MockUniswapV2FactoryIUniswapV2ERC20 { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external pure returns (string memory); function symbol() external pure returns (string memory); function decimals() external pure returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom( address from, address to, uint value ) external returns (bool); function DOMAIN_SEPARATOR() external view returns (bytes32); function PERMIT_TYPEHASH() external pure returns (bytes32); function nonces(address owner) external view returns (uint); function permit( address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s ) external; } interface MockUniswapV2FactoryIERC20 { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external view returns (string memory); function symbol() external view returns (string memory); function decimals() external view returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom( address from, address to, uint value ) external returns (bool); } interface IUniswapV2Callee { function uniswapV2Call( address sender, uint amount0, uint amount1, bytes calldata data ) external; } contract UniswapV2ERC20 { using MockUniswapV2FactorySafeMath for uint; string public constant name = 'Uniswap V2'; string public constant symbol = 'UNI-V2'; uint8 public constant decimals = 18; uint public totalSupply; mapping(address => uint) public balanceOf; mapping(address => mapping(address => uint)) public allowance; bytes32 public DOMAIN_SEPARATOR; // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; mapping(address => uint) public nonces; event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); constructor() public { uint chainId; assembly { chainId := chainid() } DOMAIN_SEPARATOR = keccak256( abi.encode( keccak256( 'EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)' ), keccak256(bytes(name)), keccak256(bytes('1')), chainId, address(this) ) ); } function _mint(address to, uint value) internal { totalSupply = totalSupply.add(value); balanceOf[to] = balanceOf[to].add(value); emit Transfer(address(0), to, value); } function _burn(address from, uint value) internal { balanceOf[from] = balanceOf[from].sub(value); totalSupply = totalSupply.sub(value); emit Transfer(from, address(0), value); } function _approve( address owner, address spender, uint value ) private { allowance[owner][spender] = value; emit Approval(owner, spender, value); } function _transfer( address from, address to, uint value ) private { balanceOf[from] = balanceOf[from].sub(value); balanceOf[to] = balanceOf[to].add(value); emit Transfer(from, to, value); } function approve(address spender, uint value) external returns (bool) { _approve(msg.sender, spender, value); return true; } function transfer(address to, uint value) external returns (bool) { _transfer(msg.sender, to, value); return true; } function transferFrom( address from, address to, uint value ) external returns (bool) { if (allowance[from][msg.sender] != uint(-1)) { allowance[from][msg.sender] = allowance[from][msg.sender].sub(value); } _transfer(from, to, value); return true; } function permit( address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s ) external { require(deadline >= block.timestamp, 'UniswapV2: EXPIRED'); bytes32 digest = keccak256( abi.encodePacked( '\x19\x01', DOMAIN_SEPARATOR, keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline)) ) ); address recoveredAddress = ecrecover(digest, v, r, s); require( recoveredAddress != address(0) && recoveredAddress == owner, 'UniswapV2: INVALID_SIGNATURE' ); _approve(owner, spender, value); } } contract MockUniswapV2FactoryUniswapV2Pair is UniswapV2ERC20 { using MockUniswapV2FactorySafeMath for uint; using UQ112x112 for uint224; uint public constant MINIMUM_LIQUIDITY = 10**3; bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)'))); address public factory; address public token0; address public token1; uint112 private reserve0; // uses single storage slot, accessible via getReserves uint112 private reserve1; // uses single storage slot, accessible via getReserves uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves uint public price0CumulativeLast; uint public price1CumulativeLast; uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event uint private unlocked = 1; modifier lock() { require(unlocked == 1, 'UniswapV2: LOCKED'); unlocked = 0; _; unlocked = 1; } function getReserves() public view returns ( uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast ) { _reserve0 = reserve0; _reserve1 = reserve1; _blockTimestampLast = blockTimestampLast; } function _safeTransfer( address token, address to, uint value ) private { (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'UniswapV2: TRANSFER_FAILED' ); } event Mint(address indexed sender, uint amount0, uint amount1); event Burn(address indexed sender, uint amount0, uint amount1, address indexed to); event Swap( address indexed sender, uint amount0In, uint amount1In, uint amount0Out, uint amount1Out, address indexed to ); event Sync(uint112 reserve0, uint112 reserve1); constructor() public { factory = msg.sender; } // called once by the factory at time of deployment function initialize(address _token0, address _token1) external { require(msg.sender == factory, 'UniswapV2: FORBIDDEN'); // sufficient check token0 = _token0; token1 = _token1; } // update reserves and, on the first call per block, price accumulators function _update( uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1 ) private { require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'UniswapV2: OVERFLOW'); uint32 blockTimestamp = uint32(block.timestamp % 2**32); uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) { // * never overflows, and + overflow is desired price0CumulativeLast += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed; price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed; } reserve0 = uint112(balance0); reserve1 = uint112(balance1); blockTimestampLast = blockTimestamp; emit Sync(reserve0, reserve1); } // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k) function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) { address feeTo = MockUniswapV2FactoryIUniswapV2Factory(factory).feeTo(); feeOn = feeTo != address(0); uint _kLast = kLast; // gas savings if (feeOn) { if (_kLast != 0) { uint rootK = MockUniswapV2FactoryMah.sqrt(uint(_reserve0).mul(_reserve1)); uint rootKLast = MockUniswapV2FactoryMah.sqrt(_kLast); if (rootK > rootKLast) { uint numerator = totalSupply.mul(rootK.sub(rootKLast)); uint denominator = rootK.mul(5).add(rootKLast); uint liquidity = numerator / denominator; if (liquidity > 0) _mint(feeTo, liquidity); } } } else if (_kLast != 0) { kLast = 0; } } // this low-level function should be called from a contract which performs important safety checks function mint(address to) external lock returns (uint liquidity) { (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings uint balance0 = MockUniswapV2FactoryIERC20(token0).balanceOf(address(this)); uint balance1 = MockUniswapV2FactoryIERC20(token1).balanceOf(address(this)); uint amount0 = balance0.sub(_reserve0); uint amount1 = balance1.sub(_reserve1); bool feeOn = _mintFee(_reserve0, _reserve1); uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee if (_totalSupply == 0) { liquidity = MockUniswapV2FactoryMah.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY); _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens } else { liquidity = MockUniswapV2FactoryMah.min( amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1 ); } require(liquidity > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED'); _mint(to, liquidity); _update(balance0, balance1, _reserve0, _reserve1); if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date emit Mint(msg.sender, amount0, amount1); } // this low-level function should be called from a contract which performs important safety checks function burn(address to) external lock returns (uint amount0, uint amount1) { (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings address _token0 = token0; // gas savings address _token1 = token1; // gas savings uint balance0 = MockUniswapV2FactoryIERC20(_token0).balanceOf(address(this)); uint balance1 = MockUniswapV2FactoryIERC20(_token1).balanceOf(address(this)); uint liquidity = balanceOf[address(this)]; bool feeOn = _mintFee(_reserve0, _reserve1); uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution require(amount0 > 0 && amount1 > 0, 'UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED'); _burn(address(this), liquidity); _safeTransfer(_token0, to, amount0); _safeTransfer(_token1, to, amount1); balance0 = MockUniswapV2FactoryIERC20(_token0).balanceOf(address(this)); balance1 = MockUniswapV2FactoryIERC20(_token1).balanceOf(address(this)); _update(balance0, balance1, _reserve0, _reserve1); if (feeOn) kLast = uint(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date emit Burn(msg.sender, amount0, amount1, to); } // this low-level function should be called from a contract which performs important safety checks function swap( uint amount0Out, uint amount1Out, address to, bytes calldata data ) external lock { require(amount0Out > 0 || amount1Out > 0, 'UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT'); (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings require(amount0Out < _reserve0 && amount1Out < _reserve1, 'UniswapV2: INSUFFICIENT_LIQUIDITY'); uint balance0; uint balance1; { // scope for _token{0,1}, avoids stack too deep errors address _token0 = token0; address _token1 = token1; require(to != _token0 && to != _token1, 'UniswapV2: INVALID_TO'); if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data); balance0 = MockUniswapV2FactoryIERC20(_token0).balanceOf(address(this)); balance1 = MockUniswapV2FactoryIERC20(_token1).balanceOf(address(this)); } uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0; uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0; require(amount0In > 0 || amount1In > 0, 'UniswapV2: INSUFFICIENT_INPUT_AMOUNT'); { // scope for reserve{0,1}Adjusted, avoids stack too deep errors uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3)); uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3)); require( balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'UniswapV2: K' ); } _update(balance0, balance1, _reserve0, _reserve1); emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to); } // force balances to match reserves function skim(address to) external lock { address _token0 = token0; // gas savings address _token1 = token1; // gas savings _safeTransfer( _token0, to, MockUniswapV2FactoryIERC20(_token0).balanceOf(address(this)).sub(reserve0) ); _safeTransfer( _token1, to, MockUniswapV2FactoryIERC20(_token1).balanceOf(address(this)).sub(reserve1) ); } // force reserves to match balances function sync() external lock { _update( MockUniswapV2FactoryIERC20(token0).balanceOf(address(this)), MockUniswapV2FactoryIERC20(token1).balanceOf(address(this)), reserve0, reserve1 ); } } contract MockUniswapV2Factory { address public feeTo; address public feeToSetter; mapping(address => mapping(address => address)) public getPair; address[] public allPairs; event PairCreated(address indexed token0, address indexed token1, address pair, uint); constructor(address _feeToSetter) public { feeToSetter = _feeToSetter; } function allPairsLength() external view returns (uint) { return allPairs.length; } function createPair(address tokenA, address tokenB) external returns (address pair) { require(tokenA != tokenB, 'UniswapV2: IDENTICAL_ADDRESSES'); (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA); require(token0 != address(0), 'UniswapV2: ZERO_ADDRESS'); require(getPair[token0][token1] == address(0), 'UniswapV2: PAIR_EXISTS'); // single check is sufficient bytes memory bytecode = type(MockUniswapV2FactoryUniswapV2Pair).creationCode; bytes32 salt = keccak256(abi.encodePacked(token0, token1)); assembly { pair := create2(0, add(bytecode, 32), mload(bytecode), salt) } MockUniswapV2FactoryIUniswapV2Pair(pair).initialize(token0, token1); getPair[token0][token1] = pair; getPair[token1][token0] = pair; // populate mapping in the reverse direction allPairs.push(pair); emit PairCreated(token0, token1, pair, allPairs.length); } function setFeeTo(address _feeTo) external { require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN'); feeTo = _feeTo; } function setFeeToSetter(address _feeToSetter) external { require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN'); feeToSetter = _feeToSetter; } } // a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math) library MockUniswapV2FactorySafeMath { function add(uint x, uint y) internal pure returns (uint z) { require((z = x + y) >= x, 'ds-math-add-overflow'); } function sub(uint x, uint y) internal pure returns (uint z) { require((z = x - y) <= x, 'ds-math-sub-underflow'); } function mul(uint x, uint y) internal pure returns (uint z) { require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow'); } } // a library for performing various math operations library MockUniswapV2FactoryMah { function min(uint x, uint y) internal pure returns (uint z) { z = x < y ? x : y; } // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) function sqrt(uint y) internal pure returns (uint z) { if (y > 3) { z = y; uint x = y / 2 + 1; while (x < z) { z = x; x = (y / x + x) / 2; } } else if (y != 0) { z = 1; } } } // a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format)) // range: [0, 2**112 - 1] // resolution: 1 / 2**112 library UQ112x112 { uint224 constant Q112 = 2**112; // encode a uint112 as a UQ112x112 function encode(uint112 y) internal pure returns (uint224 z) { z = uint224(y) * Q112; // never overflows } // divide a UQ112x112 by a uint112, returning a UQ112x112 function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) { z = x / uint224(y); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/ERC20.sol'; contract MockERC20 is ERC20 { constructor( string memory name, string memory symbol, uint8 decimals ) public ERC20(name, symbol) { _setupDecimals(decimals); } function mint(address to, uint amount) public { _mint(to, amount); } }
pragma solidity 0.6.12; // import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import '../../interfaces/ICErc20_2.sol'; contract MockCErc20_2 is ICErc20_2 { using SafeMath for uint; using SafeERC20 for IERC20; IERC20 public token; uint public mintRate = 1e18; uint public totalSupply = 0; mapping(address => uint) public override balanceOf; constructor(IERC20 _token) public { token = _token; } function setMintRate(uint _mintRate) external override { mintRate = _mintRate; } function underlying() external override returns (address) { return address(token); } function mint(uint mintAmount) external override returns (uint) { uint amountIn = mintAmount.mul(mintRate).div(1e18); IERC20(token).safeTransferFrom(msg.sender, address(this), amountIn); totalSupply = totalSupply.add(mintAmount); balanceOf[msg.sender] = balanceOf[msg.sender].add(mintAmount); return 0; } function redeem(uint redeemAmount) external override returns (uint) { uint amountOut = redeemAmount.mul(1e18).div(mintRate); IERC20(token).safeTransfer(msg.sender, amountOut); totalSupply = totalSupply.sub(redeemAmount); balanceOf[msg.sender] = balanceOf[msg.sender].sub(redeemAmount); return 0; } }
pragma solidity 0.6.12; interface ICErc20_2 { function underlying() external returns (address); function mint(uint mintAmount) external returns (uint); function redeem(uint redeemTokens) external returns (uint); function balanceOf(address user) external view returns (uint); function setMintRate(uint mintRate) external; }
pragma solidity 0.6.12; interface MockUniswapV2Router02IUniswapV2Factory { event PairCreated(address indexed token0, address indexed token1, address pair, uint); function feeTo() external view returns (address); function feeToSetter() external view returns (address); function getPair(address tokenA, address tokenB) external view returns (address pair); function allPairs(uint) external view returns (address pair); function allPairsLength() external view returns (uint); function createPair(address tokenA, address tokenB) external returns (address pair); function setFeeTo(address) external; function setFeeToSetter(address) external; } interface MockUniswapV2Router02IUniswapV2Pair { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external pure returns (string memory); function symbol() external pure returns (string memory); function decimals() external pure returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom( address from, address to, uint value ) external returns (bool); function DOMAIN_SEPARATOR() external view returns (bytes32); function PERMIT_TYPEHASH() external pure returns (bytes32); function nonces(address owner) external view returns (uint); function permit( address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s ) external; event Mint(address indexed sender, uint amount0, uint amount1); event Burn(address indexed sender, uint amount0, uint amount1, address indexed to); event Swap( address indexed sender, uint amount0In, uint amount1In, uint amount0Out, uint amount1Out, address indexed to ); event Sync(uint112 reserve0, uint112 reserve1); function MINIMUM_LIQUIDITY() external pure returns (uint); function factory() external view returns (address); function token0() external view returns (address); function token1() external view returns (address); function getReserves() external view returns ( uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast ); function price0CumulativeLast() external view returns (uint); function price1CumulativeLast() external view returns (uint); function kLast() external view returns (uint); function mint(address to) external returns (uint liquidity); function burn(address to) external returns (uint amount0, uint amount1); function swap( uint amount0Out, uint amount1Out, address to, bytes calldata data ) external; function skim(address to) external; function sync() external; function initialize(address, address) external; } interface MockUniswapV2Router02IUniswapV2Router01 { function factory() external pure returns (address); function WETH() external pure returns (address); function addLiquidity( address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns ( uint amountA, uint amountB, uint liquidity ); function addLiquidityETH( address token, uint amountTokenDesired, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external payable returns ( uint amountToken, uint amountETH, uint liquidity ); function removeLiquidity( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns (uint amountA, uint amountB); function removeLiquidityETH( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external returns (uint amountToken, uint amountETH); function removeLiquidityWithPermit( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountA, uint amountB); function removeLiquidityETHWithPermit( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountToken, uint amountETH); function swapExactTokensForTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapTokensForExactTokens( uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapExactETHForTokens( uint amountOutMin, address[] calldata path, address to, uint deadline ) external payable returns (uint[] memory amounts); function swapTokensForExactETH( uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapExactTokensForETH( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external returns (uint[] memory amounts); function swapETHForExactTokens( uint amountOut, address[] calldata path, address to, uint deadline ) external payable returns (uint[] memory amounts); function quote( uint amountA, uint reserveA, uint reserveB ) external pure returns (uint amountB); function getAmountOut( uint amountIn, uint reserveIn, uint reserveOut ) external pure returns (uint amountOut); function getAmountIn( uint amountOut, uint reserveIn, uint reserveOut ) external pure returns (uint amountIn); function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts); function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts); } interface MockUniswapV2Router02IUniswapV2Router02 is MockUniswapV2Router02IUniswapV2Router01 { function removeLiquidityETHSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external returns (uint amountETH); function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountETH); function swapExactTokensForTokensSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external; function swapExactETHForTokensSupportingFeeOnTransferTokens( uint amountOutMin, address[] calldata path, address to, uint deadline ) external payable; function swapExactTokensForETHSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external; } interface IERC20 { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value); function name() external view returns (string memory); function symbol() external view returns (string memory); function decimals() external view returns (uint8); function totalSupply() external view returns (uint); function balanceOf(address owner) external view returns (uint); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint value) external returns (bool); function transfer(address to, uint value) external returns (bool); function transferFrom( address from, address to, uint value ) external returns (bool); } interface MockUniswapV2Router02IWETH { function deposit() external payable; function transfer(address to, uint value) external returns (bool); function withdraw(uint) external; } contract MockUniswapV2Router02 is MockUniswapV2Router02IUniswapV2Router02 { using MockUniswapV2Router02SafeMath for uint; address public immutable override factory; address public immutable override WETH; modifier ensure(uint deadline) { require(deadline >= block.timestamp, 'UniswapV2Router: EXPIRED'); _; } constructor(address _factory, address _WETH) public { factory = _factory; WETH = _WETH; } receive() external payable { assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract } // **** ADD LIQUIDITY **** function _addLiquidity( address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin ) internal virtual returns (uint amountA, uint amountB) { // create the pair if it doesn't exist yet if (MockUniswapV2Router02IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) { MockUniswapV2Router02IUniswapV2Factory(factory).createPair(tokenA, tokenB); } (uint reserveA, uint reserveB) = MockUniswapV2Router02UniswapV2Library.getReserves(factory, tokenA, tokenB); if (reserveA == 0 && reserveB == 0) { (amountA, amountB) = (amountADesired, amountBDesired); } else { uint amountBOptimal = MockUniswapV2Router02UniswapV2Library.quote(amountADesired, reserveA, reserveB); if (amountBOptimal <= amountBDesired) { require(amountBOptimal >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT'); (amountA, amountB) = (amountADesired, amountBOptimal); } else { uint amountAOptimal = MockUniswapV2Router02UniswapV2Library.quote(amountBDesired, reserveB, reserveA); assert(amountAOptimal <= amountADesired); require(amountAOptimal >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT'); (amountA, amountB) = (amountAOptimal, amountBDesired); } } } function addLiquidity( address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin, address to, uint deadline ) external virtual override ensure(deadline) returns ( uint amountA, uint amountB, uint liquidity ) { (amountA, amountB) = _addLiquidity( tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin ); address pair = MockUniswapV2Router02UniswapV2Library.pairFor(factory, tokenA, tokenB); MockUniswapV2Router02TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA); MockUniswapV2Router02TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB); liquidity = MockUniswapV2Router02IUniswapV2Pair(pair).mint(to); } function addLiquidityETH( address token, uint amountTokenDesired, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external payable virtual override ensure(deadline) returns ( uint amountToken, uint amountETH, uint liquidity ) { (amountToken, amountETH) = _addLiquidity( token, WETH, amountTokenDesired, msg.value, amountTokenMin, amountETHMin ); address pair = MockUniswapV2Router02UniswapV2Library.pairFor(factory, token, WETH); MockUniswapV2Router02TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken); MockUniswapV2Router02IWETH(WETH).deposit{value: amountETH}(); assert(MockUniswapV2Router02IWETH(WETH).transfer(pair, amountETH)); liquidity = MockUniswapV2Router02IUniswapV2Pair(pair).mint(to); // refund dust eth, if any if (msg.value > amountETH) MockUniswapV2Router02TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH); } // **** REMOVE LIQUIDITY **** function removeLiquidity( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline ) public virtual override ensure(deadline) returns (uint amountA, uint amountB) { address pair = MockUniswapV2Router02UniswapV2Library.pairFor(factory, tokenA, tokenB); MockUniswapV2Router02IUniswapV2Pair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair (uint amount0, uint amount1) = MockUniswapV2Router02IUniswapV2Pair(pair).burn(to); (address token0, ) = MockUniswapV2Router02UniswapV2Library.sortTokens(tokenA, tokenB); (amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0); require(amountA >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT'); require(amountB >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT'); } function removeLiquidityETH( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) public virtual override ensure(deadline) returns (uint amountToken, uint amountETH) { (amountToken, amountETH) = removeLiquidity( token, WETH, liquidity, amountTokenMin, amountETHMin, address(this), deadline ); MockUniswapV2Router02TransferHelper.safeTransfer(token, to, amountToken); MockUniswapV2Router02IWETH(WETH).withdraw(amountETH); MockUniswapV2Router02TransferHelper.safeTransferETH(to, amountETH); } function removeLiquidityWithPermit( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external virtual override returns (uint amountA, uint amountB) { address pair = MockUniswapV2Router02UniswapV2Library.pairFor(factory, tokenA, tokenB); uint value = approveMax ? uint(-1) : liquidity; MockUniswapV2Router02IUniswapV2Pair(pair).permit( msg.sender, address(this), value, deadline, v, r, s ); (amountA, amountB) = removeLiquidity( tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline ); } function removeLiquidityETHWithPermit( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external virtual override returns (uint amountToken, uint amountETH) { address pair = MockUniswapV2Router02UniswapV2Library.pairFor(factory, token, WETH); uint value = approveMax ? uint(-1) : liquidity; MockUniswapV2Router02IUniswapV2Pair(pair).permit( msg.sender, address(this), value, deadline, v, r, s ); (amountToken, amountETH) = removeLiquidityETH( token, liquidity, amountTokenMin, amountETHMin, to, deadline ); } // **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) **** function removeLiquidityETHSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) public virtual override ensure(deadline) returns (uint amountETH) { (, amountETH) = removeLiquidity( token, WETH, liquidity, amountTokenMin, amountETHMin, address(this), deadline ); MockUniswapV2Router02TransferHelper.safeTransfer( token, to, IERC20(token).balanceOf(address(this)) ); MockUniswapV2Router02IWETH(WETH).withdraw(amountETH); MockUniswapV2Router02TransferHelper.safeTransferETH(to, amountETH); } function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external virtual override returns (uint amountETH) { address pair = MockUniswapV2Router02UniswapV2Library.pairFor(factory, token, WETH); uint value = approveMax ? uint(-1) : liquidity; MockUniswapV2Router02IUniswapV2Pair(pair).permit( msg.sender, address(this), value, deadline, v, r, s ); amountETH = removeLiquidityETHSupportingFeeOnTransferTokens( token, liquidity, amountTokenMin, amountETHMin, to, deadline ); } // **** SWAP **** // requires the initial amount to have already been sent to the first pair function _swap( uint[] memory amounts, address[] memory path, address _to ) internal virtual { for (uint i; i < path.length - 1; i++) { (address input, address output) = (path[i], path[i + 1]); (address token0, ) = MockUniswapV2Router02UniswapV2Library.sortTokens(input, output); uint amountOut = amounts[i + 1]; (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOut) : (amountOut, uint(0)); address to = i < path.length - 2 ? MockUniswapV2Router02UniswapV2Library.pairFor(factory, output, path[i + 2]) : _to; MockUniswapV2Router02IUniswapV2Pair( MockUniswapV2Router02UniswapV2Library.pairFor(factory, input, output) ) .swap(amount0Out, amount1Out, to, new bytes(0)); } } function swapExactTokensForTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external virtual override ensure(deadline) returns (uint[] memory amounts) { amounts = MockUniswapV2Router02UniswapV2Library.getAmountsOut(factory, amountIn, path); require( amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT' ); MockUniswapV2Router02TransferHelper.safeTransferFrom( path[0], msg.sender, MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0] ); _swap(amounts, path, to); } function swapTokensForExactTokens( uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline ) external virtual override ensure(deadline) returns (uint[] memory amounts) { amounts = MockUniswapV2Router02UniswapV2Library.getAmountsIn(factory, amountOut, path); require(amounts[0] <= amountInMax, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT'); MockUniswapV2Router02TransferHelper.safeTransferFrom( path[0], msg.sender, MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0] ); _swap(amounts, path, to); } function swapExactETHForTokens( uint amountOutMin, address[] calldata path, address to, uint deadline ) external payable virtual override ensure(deadline) returns (uint[] memory amounts) { require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH'); amounts = MockUniswapV2Router02UniswapV2Library.getAmountsOut(factory, msg.value, path); require( amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT' ); MockUniswapV2Router02IWETH(WETH).deposit{value: amounts[0]}(); assert( MockUniswapV2Router02IWETH(WETH).transfer( MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0] ) ); _swap(amounts, path, to); } function swapTokensForExactETH( uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline ) external virtual override ensure(deadline) returns (uint[] memory amounts) { require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH'); amounts = MockUniswapV2Router02UniswapV2Library.getAmountsIn(factory, amountOut, path); require(amounts[0] <= amountInMax, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT'); MockUniswapV2Router02TransferHelper.safeTransferFrom( path[0], msg.sender, MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0] ); _swap(amounts, path, address(this)); MockUniswapV2Router02IWETH(WETH).withdraw(amounts[amounts.length - 1]); MockUniswapV2Router02TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]); } function swapExactTokensForETH( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external virtual override ensure(deadline) returns (uint[] memory amounts) { require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH'); amounts = MockUniswapV2Router02UniswapV2Library.getAmountsOut(factory, amountIn, path); require( amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT' ); MockUniswapV2Router02TransferHelper.safeTransferFrom( path[0], msg.sender, MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0] ); _swap(amounts, path, address(this)); MockUniswapV2Router02IWETH(WETH).withdraw(amounts[amounts.length - 1]); MockUniswapV2Router02TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]); } function swapETHForExactTokens( uint amountOut, address[] calldata path, address to, uint deadline ) external payable virtual override ensure(deadline) returns (uint[] memory amounts) { require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH'); amounts = MockUniswapV2Router02UniswapV2Library.getAmountsIn(factory, amountOut, path); require(amounts[0] <= msg.value, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT'); MockUniswapV2Router02IWETH(WETH).deposit{value: amounts[0]}(); assert( MockUniswapV2Router02IWETH(WETH).transfer( MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0] ) ); _swap(amounts, path, to); // refund dust eth, if any if (msg.value > amounts[0]) MockUniswapV2Router02TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]); } // **** SWAP (supporting fee-on-transfer tokens) **** // requires the initial amount to have already been sent to the first pair function _swapSupportingFeeOnTransferTokens(address[] memory path, address _to) internal virtual { for (uint i; i < path.length - 1; i++) { (address input, address output) = (path[i], path[i + 1]); (address token0, ) = MockUniswapV2Router02UniswapV2Library.sortTokens(input, output); MockUniswapV2Router02IUniswapV2Pair pair = MockUniswapV2Router02IUniswapV2Pair( MockUniswapV2Router02UniswapV2Library.pairFor(factory, input, output) ); uint amountInput; uint amountOutput; { // scope to avoid stack too deep errors (uint reserve0, uint reserve1, ) = pair.getReserves(); (uint reserveInput, uint reserveOutput) = input == token0 ? (reserve0, reserve1) : (reserve1, reserve0); amountInput = IERC20(input).balanceOf(address(pair)).sub(reserveInput); amountOutput = MockUniswapV2Router02UniswapV2Library.getAmountOut( amountInput, reserveInput, reserveOutput ); } (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOutput) : (amountOutput, uint(0)); address to = i < path.length - 2 ? MockUniswapV2Router02UniswapV2Library.pairFor(factory, output, path[i + 2]) : _to; pair.swap(amount0Out, amount1Out, to, new bytes(0)); } } function swapExactTokensForTokensSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external virtual override ensure(deadline) { MockUniswapV2Router02TransferHelper.safeTransferFrom( path[0], msg.sender, MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn ); uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to); _swapSupportingFeeOnTransferTokens(path, to); require( IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT' ); } function swapExactETHForTokensSupportingFeeOnTransferTokens( uint amountOutMin, address[] calldata path, address to, uint deadline ) external payable virtual override ensure(deadline) { require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH'); uint amountIn = msg.value; MockUniswapV2Router02IWETH(WETH).deposit{value: amountIn}(); assert( MockUniswapV2Router02IWETH(WETH).transfer( MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn ) ); uint balanceBefore = IERC20(path[path.length - 1]).balanceOf(to); _swapSupportingFeeOnTransferTokens(path, to); require( IERC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT' ); } function swapExactTokensForETHSupportingFeeOnTransferTokens( uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline ) external virtual override ensure(deadline) { require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH'); MockUniswapV2Router02TransferHelper.safeTransferFrom( path[0], msg.sender, MockUniswapV2Router02UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn ); _swapSupportingFeeOnTransferTokens(path, address(this)); uint amountOut = IERC20(WETH).balanceOf(address(this)); require(amountOut >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT'); MockUniswapV2Router02IWETH(WETH).withdraw(amountOut); MockUniswapV2Router02TransferHelper.safeTransferETH(to, amountOut); } // **** LIBRARY FUNCTIONS **** function quote( uint amountA, uint reserveA, uint reserveB ) public pure virtual override returns (uint amountB) { return MockUniswapV2Router02UniswapV2Library.quote(amountA, reserveA, reserveB); } function getAmountOut( uint amountIn, uint reserveIn, uint reserveOut ) public pure virtual override returns (uint amountOut) { return MockUniswapV2Router02UniswapV2Library.getAmountOut(amountIn, reserveIn, reserveOut); } function getAmountIn( uint amountOut, uint reserveIn, uint reserveOut ) public pure virtual override returns (uint amountIn) { return MockUniswapV2Router02UniswapV2Library.getAmountIn(amountOut, reserveIn, reserveOut); } function getAmountsOut(uint amountIn, address[] memory path) public view virtual override returns (uint[] memory amounts) { return MockUniswapV2Router02UniswapV2Library.getAmountsOut(factory, amountIn, path); } function getAmountsIn(uint amountOut, address[] memory path) public view virtual override returns (uint[] memory amounts) { return MockUniswapV2Router02UniswapV2Library.getAmountsIn(factory, amountOut, path); } } // a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math) library MockUniswapV2Router02SafeMath { function add(uint x, uint y) internal pure returns (uint z) { require((z = x + y) >= x, 'ds-math-add-overflow'); } function sub(uint x, uint y) internal pure returns (uint z) { require((z = x - y) <= x, 'ds-math-sub-underflow'); } function mul(uint x, uint y) internal pure returns (uint z) { require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow'); } } library MockUniswapV2Router02UniswapV2Library { using MockUniswapV2Router02SafeMath for uint; // returns sorted token addresses, used to handle return values from pairs sorted in this order function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) { require(tokenA != tokenB, 'MockUniswapV2Router02UniswapV2Library: IDENTICAL_ADDRESSES'); (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA); require(token0 != address(0), 'MockUniswapV2Router02UniswapV2Library: ZERO_ADDRESS'); } // calculates the CREATE2 address for a pair without making any external calls function pairFor( address factory, address tokenA, address tokenB ) internal view returns (address pair) { return MockUniswapV2Router02IUniswapV2Factory(factory).getPair(tokenA, tokenB); } // fetches and sorts the reserves for a pair function getReserves( address factory, address tokenA, address tokenB ) internal view returns (uint reserveA, uint reserveB) { (address token0, ) = sortTokens(tokenA, tokenB); (uint reserve0, uint reserve1, ) = MockUniswapV2Router02IUniswapV2Pair(pairFor(factory, tokenA, tokenB)).getReserves(); (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0); } // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset function quote( uint amountA, uint reserveA, uint reserveB ) internal pure returns (uint amountB) { require(amountA > 0, 'MockUniswapV2Router02UniswapV2Library: INSUFFICIENT_AMOUNT'); require( reserveA > 0 && reserveB > 0, 'MockUniswapV2Router02UniswapV2Library: INSUFFICIENT_LIQUIDITY' ); amountB = amountA.mul(reserveB) / reserveA; } // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset function getAmountOut( uint amountIn, uint reserveIn, uint reserveOut ) internal pure returns (uint amountOut) { require(amountIn > 0, 'MockUniswapV2Router02UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT'); require( reserveIn > 0 && reserveOut > 0, 'MockUniswapV2Router02UniswapV2Library: INSUFFICIENT_LIQUIDITY' ); uint amountInWithFee = amountIn.mul(997); uint numerator = amountInWithFee.mul(reserveOut); uint denominator = reserveIn.mul(1000).add(amountInWithFee); amountOut = numerator / denominator; } // given an output amount of an asset and pair reserves, returns a required input amount of the other asset function getAmountIn( uint amountOut, uint reserveIn, uint reserveOut ) internal pure returns (uint amountIn) { require(amountOut > 0, 'MockUniswapV2Router02UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT'); require( reserveIn > 0 && reserveOut > 0, 'MockUniswapV2Router02UniswapV2Library: INSUFFICIENT_LIQUIDITY' ); uint numerator = reserveIn.mul(amountOut).mul(1000); uint denominator = reserveOut.sub(amountOut).mul(997); amountIn = (numerator / denominator).add(1); } // performs chained getAmountOut calculations on any number of pairs function getAmountsOut( address factory, uint amountIn, address[] memory path ) internal view returns (uint[] memory amounts) { require(path.length >= 2, 'MockUniswapV2Router02UniswapV2Library: INVALID_PATH'); amounts = new uint[](path.length); amounts[0] = amountIn; for (uint i; i < path.length - 1; i++) { (uint reserveIn, uint reserveOut) = getReserves(factory, path[i], path[i + 1]); amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut); } } // performs chained getAmountIn calculations on any number of pairs function getAmountsIn( address factory, uint amountOut, address[] memory path ) internal view returns (uint[] memory amounts) { require(path.length >= 2, 'MockUniswapV2Router02UniswapV2Library: INVALID_PATH'); amounts = new uint[](path.length); amounts[amounts.length - 1] = amountOut; for (uint i = path.length - 1; i > 0; i--) { (uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]); amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut); } } } // helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false library MockUniswapV2Router02TransferHelper { function safeApprove( address token, address to, uint value ) internal { // bytes4(keccak256(bytes('approve(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'MockUniswapV2Router02TransferHelper: APPROVE_FAILED' ); } function safeTransfer( address token, address to, uint value ) internal { // bytes4(keccak256(bytes('transfer(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'MockUniswapV2Router02TransferHelper: TRANSFER_FAILED' ); } function safeTransferFrom( address token, address from, address to, uint value ) internal { // bytes4(keccak256(bytes('transferFrom(address,address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'MockUniswapV2Router02TransferHelper: TRANSFER_FROM_FAILED' ); } function safeTransferETH(address to, uint value) internal { (bool success, ) = to.call{value: value}(new bytes(0)); require(success, 'MockUniswapV2Router02TransferHelper: ETH_TRANSFER_FAILED'); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import '../../interfaces/ICErc20.sol'; contract MockCErc20 is ICErc20 { using SafeMath for uint; IERC20 public token; uint public interestPerYear = 10e16; // 10% per year mapping(address => uint) public borrows; mapping(address => uint) public lastBlock; constructor(IERC20 _token) public { token = _token; } function underlying() external override returns (address) { return address(token); } function mint(uint mintAmount) external override returns (uint) { // Not implemented return 0; } function redeem(uint redeemTokens) external override returns (uint) { // Not implemented return 0; } function balanceOf(address user) external view override returns (uint) { // Not implemented return 0; } function borrowBalanceCurrent(address account) public override returns (uint) { uint timePast = now - lastBlock[account]; if (timePast > 0) { uint interest = borrows[account].mul(interestPerYear).div(100e16).mul(timePast).div(365 days); borrows[account] = borrows[account].add(interest); lastBlock[account] = now; } return borrows[account]; } function borrowBalanceStored(address account) external view override returns (uint) { return borrows[account]; } function borrow(uint borrowAmount) external override returns (uint) { borrowBalanceCurrent(msg.sender); token.transfer(msg.sender, borrowAmount); borrows[msg.sender] = borrows[msg.sender].add(borrowAmount); return 0; } function repayBorrow(uint repayAmount) external override returns (uint) { borrowBalanceCurrent(msg.sender); token.transferFrom(msg.sender, address(this), repayAmount); borrows[msg.sender] = borrows[msg.sender].sub(repayAmount); return 0; } }
pragma solidity 0.6.12; contract MockWETH { string public name = 'Wrapped Ether'; string public symbol = 'WETH'; uint8 public decimals = 18; event Approval(address indexed src, address indexed guy, uint wad); event Transfer(address indexed src, address indexed dst, uint wad); event Deposit(address indexed dst, uint wad); event Withdrawal(address indexed src, uint wad); mapping(address => uint) public balanceOf; mapping(address => mapping(address => uint)) public allowance; receive() external payable { deposit(); } function deposit() public payable { balanceOf[msg.sender] += msg.value; emit Deposit(msg.sender, msg.value); } function withdraw(uint wad) public { require(balanceOf[msg.sender] >= wad); balanceOf[msg.sender] -= wad; msg.sender.transfer(wad); emit Withdrawal(msg.sender, wad); } function totalSupply() public view returns (uint) { return address(this).balance; } function approve(address guy, uint wad) public returns (bool) { allowance[msg.sender][guy] = wad; emit Approval(msg.sender, guy, wad); return true; } function transfer(address dst, uint wad) public returns (bool) { return transferFrom(msg.sender, dst, wad); } function transferFrom( address src, address dst, uint wad ) public returns (bool) { require(balanceOf[src] >= wad); if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) { require(allowance[src][msg.sender] >= wad); allowance[src][msg.sender] -= wad; } balanceOf[src] -= wad; balanceOf[dst] += wad; emit Transfer(src, dst, wad); return true; } }
pragma solidity 0.6.12; import '../../interfaces/IBaseOracle.sol'; contract UsingBaseOracle { IBaseOracle public immutable base; constructor(IBaseOracle _base) public { base = _base; } }
pragma solidity 0.6.12; interface IBaseOracle { /// @dev Return the value of the given input as ETH per unit, multiplied by 2**112. /// @param token The ERC-20 token to check the value. function getETHPx(address token) external view returns (uint); }
pragma solidity 0.6.12; import '../Governable.sol'; import '../../interfaces/IBaseOracle.sol'; contract SimpleOracle is IBaseOracle, Governable { mapping(address => uint) public prices; // Mapping from token to price in ETH (times 2**112). /// The governor sets oracle price for a token. event SetETHPx(address token, uint px); /// @dev Create the contract and initialize the first governor. constructor() public { __Governable__init(); } /// @dev Return the value of the given input as ETH per unit, multiplied by 2**112. /// @param token The ERC-20 token to check the value. function getETHPx(address token) external view override returns (uint) { uint px = prices[token]; require(px != 0, 'no px'); return px; } /// @dev Set the prices of the given token addresses. /// @param tokens The token addresses to set the prices. /// @param pxs The price data points, representing token value in ETH times 2**112. function setETHPx(address[] memory tokens, uint[] memory pxs) external onlyGov { require(tokens.length == pxs.length, 'inconsistent length'); for (uint idx = 0; idx < tokens.length; idx++) { prices[tokens[idx]] = pxs[idx]; emit SetETHPx(tokens[idx], pxs[idx]); } } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import './UsingBaseOracle.sol'; import '../utils/HomoraMath.sol'; import '../../interfaces/IBaseOracle.sol'; import '../../interfaces/IUniswapV2Pair.sol'; contract UniswapV2Oracle is UsingBaseOracle, IBaseOracle { using SafeMath for uint; using HomoraMath for uint; constructor(IBaseOracle _base) public UsingBaseOracle(_base) {} /// @dev Return the value of the given input as ETH per unit, multiplied by 2**112. /// @param pair The Uniswap pair to check the value. function getETHPx(address pair) external view override returns (uint) { address token0 = IUniswapV2Pair(pair).token0(); address token1 = IUniswapV2Pair(pair).token1(); uint totalSupply = IUniswapV2Pair(pair).totalSupply(); (uint r0, uint r1, ) = IUniswapV2Pair(pair).getReserves(); uint sqrtK = HomoraMath.sqrt(r0.mul(r1)).fdiv(totalSupply); // in 2**112 uint px0 = base.getETHPx(token0); uint px1 = base.getETHPx(token1); return sqrtK.mul(2).mul(HomoraMath.sqrt(px0)).div(2**56).mul(HomoraMath.sqrt(px1)).div(2**56); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import './UsingBaseOracle.sol'; import '../utils/BNum.sol'; import '../../interfaces/IBaseOracle.sol'; import '../../interfaces/IBalancerPool.sol'; contract BalancerPairOracle is UsingBaseOracle, IBaseOracle, BNum { using SafeMath for uint; constructor(IBaseOracle _base) public UsingBaseOracle(_base) {} /// @dev Return fair reserve amounts given spot reserves, weights, and fair prices. /// @param resA Reserve of the first asset /// @param resB Reserev of the second asset /// @param wA Weight of the first asset /// @param wB Weight of the second asset /// @param pxA Fair price of the first asset /// @param pxB Fair price of the second asset function computeFairReserves( uint resA, uint resB, uint wA, uint wB, uint pxA, uint pxB ) internal pure returns (uint fairResA, uint fairResB) { uint r0 = bdiv(resA, resB); uint r1 = bdiv(bmul(wA, pxB), bmul(wB, pxA)); // fairResA = resA * (r1 / r0) ^ wB // fairResB = resB * (r0 / r1) ^ wA if (r0 > r1) { uint ratio = bdiv(r1, r0); fairResA = bmul(resA, bpow(ratio, wB)); fairResB = bdiv(resB, bpow(ratio, wA)); } else { uint ratio = bdiv(r0, r1); fairResA = bdiv(resA, bpow(ratio, wB)); fairResB = bmul(resB, bpow(ratio, wA)); } } /// @dev Return the value of the given input as ETH per unit, multiplied by 2**112. /// @param token The ERC-20 token to check the value. function getETHPx(address token) external view override returns (uint) { IBalancerPool pool = IBalancerPool(token); require(pool.getNumTokens() == 2, 'num tokens must be 2'); address[] memory tokens = pool.getFinalTokens(); address tokenA = tokens[0]; address tokenB = tokens[1]; uint pxA = base.getETHPx(tokenA); uint pxB = base.getETHPx(tokenB); (uint fairResA, uint fairResB) = computeFairReserves( pool.getBalance(tokenA), pool.getBalance(tokenB), pool.getNormalizedWeight(tokenA), pool.getNormalizedWeight(tokenB), pxA, pxB ); return fairResA.mul(pxA).add(fairResB.mul(pxB)).div(pool.totalSupply()); } }
// https://github.com/balancer-labs/balancer-core/blob/master/contracts/BNum.sol // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. pragma solidity 0.6.12; import './BConst.sol'; contract BNum is BConst { function btoi(uint a) internal pure returns (uint) { return a / BONE; } function bfloor(uint a) internal pure returns (uint) { return btoi(a) * BONE; } function badd(uint a, uint b) internal pure returns (uint) { uint c = a + b; require(c >= a, 'ERR_ADD_OVERFLOW'); return c; } function bsub(uint a, uint b) internal pure returns (uint) { (uint c, bool flag) = bsubSign(a, b); require(!flag, 'ERR_SUB_UNDERFLOW'); return c; } function bsubSign(uint a, uint b) internal pure returns (uint, bool) { if (a >= b) { return (a - b, false); } else { return (b - a, true); } } function bmul(uint a, uint b) internal pure returns (uint) { uint c0 = a * b; require(a == 0 || c0 / a == b, 'ERR_MUL_OVERFLOW'); uint c1 = c0 + (BONE / 2); require(c1 >= c0, 'ERR_MUL_OVERFLOW'); uint c2 = c1 / BONE; return c2; } function bdiv(uint a, uint b) internal pure returns (uint) { require(b != 0, 'ERR_DIV_ZERO'); uint c0 = a * BONE; require(a == 0 || c0 / a == BONE, 'ERR_DIV_INTERNAL'); // bmul overflow uint c1 = c0 + (b / 2); require(c1 >= c0, 'ERR_DIV_INTERNAL'); // badd require uint c2 = c1 / b; return c2; } // DSMath.wpow function bpowi(uint a, uint n) internal pure returns (uint) { uint z = n % 2 != 0 ? a : BONE; for (n /= 2; n != 0; n /= 2) { a = bmul(a, a); if (n % 2 != 0) { z = bmul(z, a); } } return z; } // Compute b^(e.w) by splitting it into (b^e)*(b^0.w). // Use `bpowi` for `b^e` and `bpowK` for k iterations // of approximation of b^0.w function bpow(uint base, uint exp) internal pure returns (uint) { require(base >= MIN_BPOW_BASE, 'ERR_BPOW_BASE_TOO_LOW'); require(base <= MAX_BPOW_BASE, 'ERR_BPOW_BASE_TOO_HIGH'); uint whole = bfloor(exp); uint remain = bsub(exp, whole); uint wholePow = bpowi(base, btoi(whole)); if (remain == 0) { return wholePow; } uint partialResult = bpowApprox(base, remain, BPOW_PRECISION); return bmul(wholePow, partialResult); } function bpowApprox( uint base, uint exp, uint precision ) internal pure returns (uint) { // term 0: uint a = exp; (uint x, bool xneg) = bsubSign(base, BONE); uint term = BONE; uint sum = term; bool negative = false; // term(k) = numer / denom // = (product(a - i - 1, i=1-->k) * x^k) / (k!) // each iteration, multiply previous term by (a-(k-1)) * x / k // continue until term is less than precision for (uint i = 1; term >= precision; i++) { uint bigK = i * BONE; (uint c, bool cneg) = bsubSign(a, bsub(bigK, BONE)); term = bmul(term, bmul(c, x)); term = bdiv(term, bigK); if (term == 0) break; if (xneg) negative = !negative; if (cneg) negative = !negative; if (negative) { sum = bsub(sum, term); } else { sum = badd(sum, term); } } return sum; } }
// https://github.com/balancer-labs/balancer-core/blob/master/contracts/BConst.sol // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. pragma solidity 0.6.12; contract BConst { uint public constant BONE = 10**18; uint public constant MIN_BOUND_TOKENS = 2; uint public constant MAX_BOUND_TOKENS = 8; uint public constant MIN_FEE = BONE / 10**6; uint public constant MAX_FEE = BONE / 10; uint public constant EXIT_FEE = 0; uint public constant MIN_WEIGHT = BONE; uint public constant MAX_WEIGHT = BONE * 50; uint public constant MAX_TOTAL_WEIGHT = BONE * 50; uint public constant MIN_BALANCE = BONE / 10**12; uint public constant INIT_POOL_SUPPLY = BONE * 100; uint public constant MIN_BPOW_BASE = 1 wei; uint public constant MAX_BPOW_BASE = (2 * BONE) - 1 wei; uint public constant BPOW_PRECISION = BONE / 10**10; uint public constant MAX_IN_RATIO = BONE / 2; uint public constant MAX_OUT_RATIO = (BONE / 3) + 1 wei; }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import './UsingBaseOracle.sol'; import '../../interfaces/IBaseOracle.sol'; import '../../interfaces/ICurvePool.sol'; import '../../interfaces/ICurveRegistry.sol'; interface IERC20Decimal { function decimals() external view returns (uint8); } contract CurveOracle is UsingBaseOracle, IBaseOracle { using SafeMath for uint; ICurveRegistry public immutable registry; struct UnderlyingToken { uint8 decimals; // token decimals address token; // token address } mapping(address => UnderlyingToken[]) public ulTokens; // lpToken -> underlying tokens array mapping(address => address) public poolOf; // lpToken -> pool constructor(IBaseOracle _base, ICurveRegistry _registry) public UsingBaseOracle(_base) { registry = _registry; } /// @dev Register the pool given LP token address and set the pool info. /// @param lp LP token to find the corresponding pool. function registerPool(address lp) external { address pool = poolOf[lp]; require(pool == address(0), 'lp is already registered'); pool = registry.get_pool_from_lp_token(lp); require(pool != address(0), 'no corresponding pool for lp token'); poolOf[lp] = pool; uint n = registry.get_n_coins(pool); address[8] memory tokens = registry.get_coins(pool); for (uint i = 0; i < n; i++) { ulTokens[lp].push( UnderlyingToken({token: tokens[i], decimals: IERC20Decimal(tokens[i]).decimals()}) ); } } /// @dev Return the value of the given input as ETH per unit, multiplied by 2**112. /// @param lp The ERC-20 LP token to check the value. function getETHPx(address lp) external view override returns (uint) { address pool = poolOf[lp]; require(pool != address(0), 'lp is not registered'); UnderlyingToken[] memory tokens = ulTokens[lp]; uint minPx = uint(-1); uint n = tokens.length; for (uint idx = 0; idx < n; idx++) { UnderlyingToken memory ulToken = tokens[idx]; uint tokenPx = base.getETHPx(ulToken.token); if (ulToken.decimals < 18) tokenPx = tokenPx.div(10**(18 - uint(ulToken.decimals))); if (ulToken.decimals > 18) tokenPx = tokenPx.mul(10**(uint(ulToken.decimals) - 18)); if (tokenPx < minPx) minPx = tokenPx; } require(minPx != uint(-1), 'no min px'); return minPx.mul(ICurvePool(pool).get_virtual_price()).div(1e18); } }
pragma solidity 0.6.12; import './BaseKP3ROracle.sol'; import '../../interfaces/IBaseOracle.sol'; import '../../interfaces/IKeep3rV1Oracle.sol'; import '../../interfaces/IUniswapV2Factory.sol'; contract ERC20KP3ROracle is IBaseOracle, BaseKP3ROracle { constructor(IKeep3rV1Oracle _kp3r) public BaseKP3ROracle(_kp3r) {} /// @dev Return the value of the given input as ETH per unit, multiplied by 2**112. /// @param token The ERC-20 token to check the value. function getETHPx(address token) external view override returns (uint) { if (token == weth || token == 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE) { return 2**112; } address pair = IUniswapV2Factory(factory).getPair(token, weth); if (token < weth) { return price0TWAP(pair); } else { return price1TWAP(pair); } } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/proxy/Initializable.sol'; import '../../interfaces/IKeep3rV1Oracle.sol'; import '../../interfaces/IUniswapV2Pair.sol'; contract BaseKP3ROracle is Initializable { uint public constant MIN_TWAP_TIME = 15 minutes; uint public constant MAX_TWAP_TIME = 60 minutes; IKeep3rV1Oracle public immutable kp3r; address public immutable factory; address public immutable weth; constructor(IKeep3rV1Oracle _kp3r) public { kp3r = _kp3r; factory = _kp3r.factory(); weth = _kp3r.WETH(); } /// @dev Return the TWAP value price0. Revert if TWAP time range is not within the threshold. /// @param pair The pair to query for price0. function price0TWAP(address pair) public view returns (uint) { uint length = kp3r.observationLength(pair); require(length > 0, 'no length-1 observation'); (uint lastTime, uint lastPx0Cumu, ) = kp3r.observations(pair, length - 1); if (lastTime > now - MIN_TWAP_TIME) { require(length > 1, 'no length-2 observation'); (lastTime, lastPx0Cumu, ) = kp3r.observations(pair, length - 2); } uint elapsedTime = now - lastTime; require(elapsedTime >= MIN_TWAP_TIME && elapsedTime <= MAX_TWAP_TIME, 'bad TWAP time'); uint currPx0Cumu = currentPx0Cumu(pair); return (currPx0Cumu - lastPx0Cumu) / (now - lastTime); // overflow is desired } /// @dev Return the TWAP value price1. Revert if TWAP time range is not within the threshold. /// @param pair The pair to query for price1. function price1TWAP(address pair) public view returns (uint) { uint length = kp3r.observationLength(pair); require(length > 0, 'no length-1 observation'); (uint lastTime, , uint lastPx1Cumu) = kp3r.observations(pair, length - 1); if (lastTime > now - MIN_TWAP_TIME) { require(length > 1, 'no length-2 observation'); (lastTime, , lastPx1Cumu) = kp3r.observations(pair, length - 2); } uint elapsedTime = now - lastTime; require(elapsedTime >= MIN_TWAP_TIME && elapsedTime <= MAX_TWAP_TIME, 'bad TWAP time'); uint currPx1Cumu = currentPx1Cumu(pair); return (currPx1Cumu - lastPx1Cumu) / (now - lastTime); // overflow is desired } /// @dev Return the current price0 cumulative value on uniswap. /// @param pair The uniswap pair to query for price0 cumulative value. function currentPx0Cumu(address pair) public view returns (uint px0Cumu) { uint32 currTime = uint32(now); px0Cumu = IUniswapV2Pair(pair).price0CumulativeLast(); (uint reserve0, uint reserve1, uint32 lastTime) = IUniswapV2Pair(pair).getReserves(); if (lastTime != now) { uint32 timeElapsed = currTime - lastTime; // overflow is desired px0Cumu += uint((reserve1 << 112) / reserve0) * timeElapsed; // overflow is desired } } /// @dev Return the current price1 cumulative value on uniswap. /// @param pair The uniswap pair to query for price1 cumulative value. function currentPx1Cumu(address pair) public view returns (uint px1Cumu) { uint32 currTime = uint32(now); px1Cumu = IUniswapV2Pair(pair).price1CumulativeLast(); (uint reserve0, uint reserve1, uint32 lastTime) = IUniswapV2Pair(pair).getReserves(); if (lastTime != currTime) { uint32 timeElapsed = currTime - lastTime; // overflow is desired px1Cumu += uint((reserve0 << 112) / reserve1) * timeElapsed; // overflow is desired } } }
pragma solidity 0.6.12; abstract contract IKeep3rV1Oracle { struct Observation { uint timestamp; uint price0Cumulative; uint price1Cumulative; } function WETH() external pure virtual returns (address); function factory() external pure virtual returns (address); mapping(address => Observation[]) public observations; function observationLength(address pair) external view virtual returns (uint); }
pragma solidity 0.6.12; pragma experimental ABIEncoderV2; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import '../Governable.sol'; import '../../interfaces/IOracle.sol'; import '../../interfaces/IBaseOracle.sol'; import '../../interfaces/IERC20Wrapper.sol'; contract ProxyOracle is IOracle, Governable { using SafeMath for uint; /// The governor sets oracle information for a token. event SetOracle(address token, Oracle info); /// The governor unsets oracle information for a token. event UnsetOracle(address token); /// The governor sets token whitelist for an ERC1155 token. event SetWhitelist(address token, bool ok); struct Oracle { uint16 borrowFactor; // The borrow factor for this token, multiplied by 1e4. uint16 collateralFactor; // The collateral factor for this token, multiplied by 1e4. uint16 liqIncentive; // The liquidation incentive, multiplied by 1e4. } IBaseOracle immutable source; mapping(address => Oracle) public oracles; // Mapping from token address to oracle info. mapping(address => bool) public whitelistERC1155; /// @dev Create the contract and initialize the first governor. constructor(IBaseOracle _source) public { source = _source; __Governable__init(); } /// @dev Set oracle information for the given list of token addresses. function setOracles(address[] memory tokens, Oracle[] memory info) external onlyGov { require(tokens.length == info.length, 'inconsistent length'); for (uint idx = 0; idx < tokens.length; idx++) { require(info[idx].borrowFactor >= 10000, 'borrow factor must be at least 100%'); require(info[idx].collateralFactor <= 10000, 'collateral factor must be at most 100%'); require(info[idx].liqIncentive >= 10000, 'incentive must be at least 100%'); require(info[idx].liqIncentive <= 20000, 'incentive must be at most 200%'); oracles[tokens[idx]] = info[idx]; emit SetOracle(tokens[idx], info[idx]); } } function unsetOracles(address[] memory tokens) external onlyGov { for (uint idx = 0; idx < tokens.length; idx++) { oracles[tokens[idx]] = Oracle(0, 0, 0); emit UnsetOracle(tokens[idx]); } } /// @dev Set whitelist status for the given list of token addresses. function setWhitelistERC1155(address[] memory tokens, bool ok) external onlyGov { for (uint idx = 0; idx < tokens.length; idx++) { whitelistERC1155[tokens[idx]] = ok; emit SetWhitelist(tokens[idx], ok); } } /// @dev Return whether the oracle supports evaluating collateral value of the given token. function support(address token, uint id) external view override returns (bool) { if (!whitelistERC1155[token]) return false; address tokenUnderlying = IERC20Wrapper(token).getUnderlyingToken(id); return oracles[tokenUnderlying].liqIncentive != 0; } /// @dev Return the amount of token out as liquidation reward for liquidating token in. function convertForLiquidation( address tokenIn, address tokenOut, uint tokenOutId, uint amountIn ) external view override returns (uint) { require(whitelistERC1155[tokenOut], 'bad token'); address tokenOutUnderlying = IERC20Wrapper(tokenOut).getUnderlyingToken(tokenOutId); uint rateUnderlying = IERC20Wrapper(tokenOut).getUnderlyingRate(tokenOutId); Oracle memory oracleIn = oracles[tokenIn]; Oracle memory oracleOut = oracles[tokenOutUnderlying]; require(oracleIn.liqIncentive != 0, 'bad underlying in'); require(oracleOut.liqIncentive != 0, 'bad underlying out'); uint pxIn = source.getETHPx(tokenIn); uint pxOut = source.getETHPx(tokenOutUnderlying); uint amountOut = amountIn.mul(pxIn).div(pxOut); amountOut = amountOut.mul(2**112).div(rateUnderlying); return amountOut.mul(oracleIn.liqIncentive).mul(oracleOut.liqIncentive).div(10000 * 10000); } /// @dev Return the value of the given input as ETH for collateral purpose. function asETHCollateral( address token, uint id, uint amount ) external view override returns (uint) { require(whitelistERC1155[token], 'bad token'); address tokenUnderlying = IERC20Wrapper(token).getUnderlyingToken(id); uint rateUnderlying = IERC20Wrapper(token).getUnderlyingRate(id); uint amountUnderlying = amount.mul(rateUnderlying).div(2**112); Oracle memory oracle = oracles[tokenUnderlying]; require(oracle.liqIncentive != 0, 'bad underlying collateral'); uint ethValue = source.getETHPx(tokenUnderlying).mul(amountUnderlying).div(2**112); return ethValue.mul(oracle.collateralFactor).div(10000); } /// @dev Return the value of the given input as ETH for borrow purpose. function asETHBorrow(address token, uint amount) external view override returns (uint) { Oracle memory oracle = oracles[token]; require(oracle.liqIncentive != 0, 'bad underlying borrow'); uint ethValue = source.getETHPx(token).mul(amount).div(2**112); return ethValue.mul(oracle.borrowFactor).div(10000); } }
pragma solidity 0.6.12; interface IOracle { /// @dev Return whether the oracle supports evaluating collateral value of the given address. /// @param token The ERC-1155 token to check the acceptence. /// @param id The token id to check the acceptance. function support(address token, uint id) external view returns (bool); /// @dev Return the amount of token out as liquidation reward for liquidating token in. /// @param tokenIn The ERC-20 token that gets liquidated. /// @param tokenOut The ERC-1155 token to pay as reward. /// @param tokenOutId The id of the token to pay as reward. /// @param amountIn The amount of liquidating tokens. function convertForLiquidation( address tokenIn, address tokenOut, uint tokenOutId, uint amountIn ) external view returns (uint); /// @dev Return the value of the given input as ETH for collateral purpose. /// @param token The ERC-1155 token to check the value. /// @param id The id of the token to check the value. /// @param amount The amount of tokens to check the value. function asETHCollateral( address token, uint id, uint amount ) external view returns (uint); /// @dev Return the value of the given input as ETH for borrow purpose. /// @param token The ERC-20 token to check the value. /// @param amount The amount of tokens to check the value. function asETHBorrow(address token, uint amount) external view returns (uint); }
pragma solidity 0.6.12; import '../../interfaces/IBaseOracle.sol'; import '../Governable.sol'; contract CoreOracle is IBaseOracle, Governable { event SetRoute(address token, address route); mapping(address => address) public routes; constructor() public { __Governable__init(); } function setRoute(address[] calldata tokens, address[] calldata targets) external onlyGov { require(tokens.length == targets.length, 'inconsistent length'); for (uint idx = 0; idx < tokens.length; idx++) { routes[tokens[idx]] = targets[idx]; emit SetRoute(tokens[idx], targets[idx]); } } function getETHPx(address token) external view override returns (uint) { uint px = IBaseOracle(routes[token]).getETHPx(token); require(px != 0, 'no px'); return px; } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/IERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/SafeERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/token/ERC1155/IERC1155.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import 'OpenZeppelin/[email protected]/contracts/math/Math.sol'; import 'OpenZeppelin/[email protected]/contracts/proxy/Initializable.sol'; import './Governable.sol'; import './utils/ERC1155NaiveReceiver.sol'; import '../interfaces/IBank.sol'; import '../interfaces/ICErc20.sol'; import '../interfaces/IOracle.sol'; contract HomoraCaster { /// @dev Call to the target using the given data. /// @param target The address target to call. /// @param data The data used in the call. function cast(address target, bytes calldata data) external payable { (bool ok, bytes memory returndata) = target.call{value: msg.value}(data); if (!ok) { if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert('bad cast call'); } } } } contract HomoraBank is Initializable, Governable, ERC1155NaiveReceiver, IBank { using SafeMath for uint; using SafeERC20 for IERC20; uint private constant _NOT_ENTERED = 1; uint private constant _ENTERED = 2; uint private constant _NO_ID = uint(-1); address private constant _NO_ADDRESS = address(1); struct Bank { bool isListed; // Whether this market exists. uint8 index; // Reverse look up index for this bank. address cToken; // The CToken to draw liquidity from. uint reserve; // The reserve portion allocated to Homora protocol. uint pendingReserve; // The pending reserve portion waiting to be resolve. uint totalDebt; // The last recorded total debt since last action. uint totalShare; // The total debt share count across all open positions. } struct Position { address owner; // The owner of this position. address collToken; // The ERC1155 token used as collateral for this position. uint collId; // The token id used as collateral. uint collateralSize; // The size of collateral token for this position. uint debtMap; // Bitmap of nonzero debt. i^th bit is set iff debt share of i^th bank is nonzero. mapping(address => uint) debtShareOf; // The debt share for each token. } uint public _GENERAL_LOCK; // TEMPORARY: re-entrancy lock guard. uint public _IN_EXEC_LOCK; // TEMPORARY: exec lock guard. uint public override POSITION_ID; // TEMPORARY: position ID currently under execution. address public override SPELL; // TEMPORARY: spell currently under execution. address public caster; // The caster address for untrusted execution. IOracle public oracle; // The oracle address for determining prices. uint public feeBps; // The fee collected as protocol reserve in basis point from interest. uint public override nextPositionId; // Next available position ID, starting from 1 (see initialize). address[] public allBanks; // The list of all listed banks. mapping(address => Bank) public banks; // Mapping from token to bank data. mapping(address => bool) public cTokenInBank; // Mapping from cToken to its existence in bank. mapping(uint => Position) public positions; // Mapping from position ID to position data. /// @dev Reentrancy lock guard. modifier lock() { require(_GENERAL_LOCK == _NOT_ENTERED, 'general lock'); _GENERAL_LOCK = _ENTERED; _; _GENERAL_LOCK = _NOT_ENTERED; } /// @dev Ensure that the function is called from within the execution scope. modifier inExec() { require(POSITION_ID != _NO_ID, 'not within execution'); require(SPELL == msg.sender, 'not from spell'); require(_IN_EXEC_LOCK == _NOT_ENTERED, 'in exec lock'); _IN_EXEC_LOCK = _ENTERED; _; _IN_EXEC_LOCK = _NOT_ENTERED; } /// @dev Ensure that the interest rate of the given token is accrued. modifier poke(address token) { accrue(token); _; } /// @dev Initialize the bank smart contract, using msg.sender as the first governor. /// @param _oracle The oracle smart contract address. /// @param _feeBps The fee collected to Homora bank. function initialize(IOracle _oracle, uint _feeBps) external initializer { __Governable__init(); _GENERAL_LOCK = _NOT_ENTERED; _IN_EXEC_LOCK = _NOT_ENTERED; POSITION_ID = _NO_ID; SPELL = _NO_ADDRESS; caster = address(new HomoraCaster()); oracle = _oracle; require(address(_oracle) != address(0), 'bad oracle address'); feeBps = _feeBps; nextPositionId = 1; emit SetOracle(address(_oracle)); emit SetFeeBps(_feeBps); } /// @dev Return the current executor (the owner of the current position). function EXECUTOR() external view override returns (address) { uint positionId = POSITION_ID; require(positionId != _NO_ID, 'not under execution'); return positions[positionId].owner; } /// @dev Trigger interest accrual for the given bank. /// @param token The underlying token to trigger the interest accrual. function accrue(address token) public override { Bank storage bank = banks[token]; require(bank.isListed, 'bank not exists'); uint totalDebt = bank.totalDebt; uint debt = ICErc20(bank.cToken).borrowBalanceCurrent(address(this)); if (debt > totalDebt) { uint fee = debt.sub(totalDebt).mul(feeBps).div(10000); bank.totalDebt = debt; bank.pendingReserve = bank.pendingReserve.add(fee); } else if (totalDebt != debt) { // We should never reach here because CREAMv2 does not support *repayBorrowBehalf* // functionality. We set bank.totalDebt = debt nonetheless to ensure consistency. But do // note that if *repayBorrowBehalf* exists, an attacker can maliciously deflate debt // share value and potentially make this contract stop working due to math overflow. bank.totalDebt = debt; } } /// @dev Convenient function to trigger interest accrual for a list of banks. /// @param tokens The list of banks to trigger interest accrual. function accrueAll(address[] memory tokens) external { for (uint idx = 0; idx < tokens.length; idx++) { accrue(tokens[idx]); } } /// @dev Trigger reserve resolve by borrowing the pending amount for reserve. /// @param token The underlying token to trigger reserve resolve. function resolveReserve(address token) public lock { Bank storage bank = banks[token]; require(bank.isListed, 'bank not exists'); uint pendingReserve = bank.pendingReserve; bank.pendingReserve = 0; bank.reserve = bank.reserve.add(doBorrow(token, pendingReserve)); } /// @dev Convenient function to trigger reserve resolve for the list of banks. /// @param tokens The list of banks to trigger reserve resolve. function resolveReserveAll(address[] memory tokens) external { for (uint idx = 0; idx < tokens.length; idx++) { resolveReserve(tokens[idx]); } } /// @dev Return the borrow balance for given positon and token without trigger interest accrual. /// @param positionId The position to query for borrow balance. /// @param token The token to query for borrow balance. function borrowBalanceStored(uint positionId, address token) public view override returns (uint) { uint totalDebt = banks[token].totalDebt; uint totalShare = banks[token].totalShare; uint share = positions[positionId].debtShareOf[token]; if (share == 0 || totalDebt == 0) { return 0; } else { return share.mul(totalDebt).div(totalShare); } } /// @dev Trigger interest accrual and return the current borrow balance. /// @param positionId The position to query for borrow balance. /// @param token The token to query for borrow balance. function borrowBalanceCurrent(uint positionId, address token) external override returns (uint) { accrue(token); return borrowBalanceStored(positionId, token); } /// @dev Return bank information for the given token. /// @param token The token address to query for bank information. function getBankInfo(address token) external view override returns ( bool isListed, address cToken, uint reserve, uint totalDebt, uint totalShare ) { Bank storage bank = banks[token]; return (bank.isListed, bank.cToken, bank.reserve, bank.totalDebt, bank.totalShare); } /// @dev Return position information for the given position id. /// @param positionId The position id to query for position information. function getPositionInfo(uint positionId) external view override returns ( address owner, address collToken, uint collId, uint collateralSize ) { Position storage pos = positions[positionId]; return (pos.owner, pos.collToken, pos.collId, pos.collateralSize); } /// @dev Return the debt share of the given bank token for the given position id. function getPositionDebtShareOf(uint positionId, address token) external view returns (uint) { return positions[positionId].debtShareOf[token]; } /// @dev Return the list of all debts for the given position id. function getPositionDebts(uint positionId) external view returns (address[] memory tokens, uint[] memory debts) { Position storage pos = positions[positionId]; uint count = 0; uint bitMap = pos.debtMap; while (bitMap > 0) { if ((bitMap & 1) != 0) { count++; } bitMap >>= 1; } tokens = new address[](count); debts = new uint[](count); bitMap = pos.debtMap; count = 0; uint idx = 0; while (bitMap > 0) { if ((bitMap & 1) != 0) { address token = allBanks[idx]; Bank storage bank = banks[token]; tokens[count] = token; debts[count] = pos.debtShareOf[token].mul(bank.totalDebt).div(bank.totalShare); count++; } idx++; bitMap >>= 1; } } /// @dev Return the total collateral value of the given position in ETH. /// @param positionId The position ID to query for the collateral value. function getCollateralETHValue(uint positionId) public view returns (uint) { Position storage pos = positions[positionId]; uint size = pos.collateralSize; if (size == 0) { return 0; } else { require(pos.collToken != address(0), 'bad collateral token'); return oracle.asETHCollateral(pos.collToken, pos.collId, size); } } /// @dev Return the total borrow value of the given position in ETH. /// @param positionId The position ID to query for the borrow value. function getBorrowETHValue(uint positionId) public view override returns (uint) { uint value = 0; Position storage pos = positions[positionId]; uint bitMap = pos.debtMap; uint idx = 0; while (bitMap > 0) { if ((bitMap & 1) != 0) { address token = allBanks[idx]; uint share = pos.debtShareOf[token]; Bank storage bank = banks[token]; uint debt = share.mul(bank.totalDebt).div(bank.totalShare); value = value.add(oracle.asETHBorrow(token, debt)); } idx++; bitMap >>= 1; } return value; } /// @dev Add a new bank to the ecosystem. /// @param token The underlying token for the bank. /// @param cToken The address of the cToken smart contract. function addBank(address token, address cToken) external onlyGov { Bank storage bank = banks[token]; require(!cTokenInBank[cToken], 'cToken already exists'); require(!bank.isListed, 'bank already exists'); cTokenInBank[cToken] = true; bank.isListed = true; require(allBanks.length < 256, 'reach bank limit'); bank.index = uint8(allBanks.length); bank.cToken = cToken; IERC20(token).safeApprove(cToken, 0); IERC20(token).safeApprove(cToken, uint(-1)); allBanks.push(token); emit AddBank(token, cToken); } /// @dev Upgrade cToken contract address to a new address. Must be used with care! /// @param token The underlying token for the bank. /// @param cToken The address of the cToken smart contract. function setCToken(address token, address cToken) external onlyGov { Bank storage bank = banks[token]; require(!cTokenInBank[cToken], 'cToken already exists'); require(bank.isListed, 'bank not exists'); cTokenInBank[bank.cToken] = false; cTokenInBank[cToken] = true; IERC20(bank.cToken).safeApprove(cToken, 0); IERC20(token).safeApprove(cToken, 0); IERC20(token).safeApprove(cToken, uint(-1)); bank.cToken = cToken; emit SetCToken(token, cToken); } /// @dev Set the oracle smart contract address. /// @param _oracle The new oracle smart contract address. function setOracle(IOracle _oracle) external onlyGov { oracle = _oracle; emit SetOracle(address(_oracle)); } /// @dev Set the fee bps value that Homora bank charges. /// @param _feeBps The new fee bps value. function setFeeBps(uint _feeBps) external onlyGov { require(_feeBps <= 10000, 'fee too high'); feeBps = _feeBps; emit SetFeeBps(_feeBps); } /// @dev Withdraw the reserve portion of the bank. /// @param amount The amount of tokens to withdraw. function withdrawReserve(address token, uint amount) external onlyGov lock { Bank storage bank = banks[token]; require(bank.isListed, 'bank not exists'); bank.reserve = bank.reserve.sub(amount); IERC20(token).safeTransfer(msg.sender, amount); emit WithdrawReserve(msg.sender, token, amount); } /// @dev Liquidate a position. Pay debt for its owner and take the collateral. /// @param positionId The position ID to liquidate. /// @param debtToken The debt token to repay. /// @param amountCall The amount to repay when doing transferFrom call. function liquidate( uint positionId, address debtToken, uint amountCall ) external override lock poke(debtToken) { uint collateralValue = getCollateralETHValue(positionId); uint borrowValue = getBorrowETHValue(positionId); require(collateralValue < borrowValue, 'position still healthy'); Position storage pos = positions[positionId]; (uint amountPaid, uint share) = repayInternal(positionId, debtToken, amountCall); require(pos.collToken != address(0), 'bad collateral token'); uint bounty = Math.min( oracle.convertForLiquidation(debtToken, pos.collToken, pos.collId, amountPaid), pos.collateralSize ); pos.collateralSize = pos.collateralSize.sub(bounty); IERC1155(pos.collToken).safeTransferFrom(address(this), msg.sender, pos.collId, bounty, ''); emit Liquidate(positionId, msg.sender, debtToken, amountPaid, share, bounty); } /// @dev Execute the action via HomoraCaster, calling its function with the supplied data. /// @param positionId The position ID to execute the action, or zero for new position. /// @param spell The target spell to invoke the execution via HomoraCaster. /// @param data Extra data to pass to the target for the execution. function execute( uint positionId, address spell, bytes memory data ) external payable lock returns (uint) { if (positionId == 0) { positionId = nextPositionId++; positions[positionId].owner = msg.sender; } else { require(positionId < nextPositionId, 'position id not exists'); require(msg.sender == positions[positionId].owner, 'not position owner'); } POSITION_ID = positionId; SPELL = spell; HomoraCaster(caster).cast{value: msg.value}(spell, data); uint collateralValue = getCollateralETHValue(positionId); uint borrowValue = getBorrowETHValue(positionId); require(collateralValue >= borrowValue, 'insufficient collateral'); POSITION_ID = _NO_ID; SPELL = _NO_ADDRESS; return positionId; } /// @dev Borrow tokens from that bank. Must only be called while under execution. /// @param token The token to borrow from the bank. /// @param amount The amount of tokens to borrow. function borrow(address token, uint amount) external override inExec poke(token) { Bank storage bank = banks[token]; require(bank.isListed, 'bank not exists'); Position storage pos = positions[POSITION_ID]; uint totalShare = bank.totalShare; uint totalDebt = bank.totalDebt; uint share = totalShare == 0 ? amount : amount.mul(totalShare).div(totalDebt); bank.totalShare = bank.totalShare.add(share); uint newShare = pos.debtShareOf[token].add(share); pos.debtShareOf[token] = newShare; if (newShare > 0) { pos.debtMap |= (1 << uint(bank.index)); } IERC20(token).safeTransfer(msg.sender, doBorrow(token, amount)); emit Borrow(POSITION_ID, msg.sender, token, amount, share); } /// @dev Repay tokens to the bank. Must only be called while under execution. /// @param token The token to repay to the bank. /// @param amountCall The amount of tokens to repay via transferFrom. function repay(address token, uint amountCall) external override inExec poke(token) { (uint amount, uint share) = repayInternal(POSITION_ID, token, amountCall); emit Repay(POSITION_ID, msg.sender, token, amount, share); } /// @dev Perform repay action. Return the amount actually taken and the debt share reduced. /// @param positionId The position ID to repay the debt. /// @param token The bank token to pay the debt. /// @param amountCall The amount to repay by calling transferFrom, or -1 for debt size. function repayInternal( uint positionId, address token, uint amountCall ) internal returns (uint, uint) { Bank storage bank = banks[token]; require(bank.isListed, 'bank not exists'); Position storage pos = positions[positionId]; uint totalShare = bank.totalShare; uint totalDebt = bank.totalDebt; uint oldShare = pos.debtShareOf[token]; uint oldDebt = oldShare.mul(totalDebt).div(totalShare); if (amountCall == uint(-1)) { amountCall = oldDebt; } uint paid = doRepay(token, doERC20TransferIn(token, amountCall)); require(paid <= oldDebt, 'paid exceeds debt'); // prevent share overflow attack uint lessShare = paid == oldDebt ? oldShare : paid.mul(totalShare).div(totalDebt); bank.totalShare = totalShare.sub(lessShare); uint newShare = oldShare.sub(lessShare); pos.debtShareOf[token] = newShare; if (newShare == 0) { pos.debtMap &= ~(1 << uint(bank.index)); } return (paid, lessShare); } /// @dev Transmit user assets to the caller, so users only need to approve Bank for spending. /// @param token The token to transfer from user to the caller. /// @param amount The amount to transfer. function transmit(address token, uint amount) external override inExec { Position storage pos = positions[POSITION_ID]; IERC20(token).safeTransferFrom(pos.owner, msg.sender, amount); } /// @dev Put more collateral for users. Must only be called during execution. /// @param collToken The ERC1155 token to collateral. /// @param collId The token id to collateral. /// @param amountCall The amount of tokens to put via transferFrom. function putCollateral( address collToken, uint collId, uint amountCall ) external override inExec { Position storage pos = positions[POSITION_ID]; if (pos.collToken != collToken || pos.collId != collId) { require(oracle.support(collToken, collId), 'collateral not supported'); require(pos.collateralSize == 0, 'another type of collateral already exists'); pos.collToken = collToken; pos.collId = collId; } uint amount = doERC1155TransferIn(collToken, collId, amountCall); pos.collateralSize = pos.collateralSize.add(amount); emit PutCollateral(POSITION_ID, msg.sender, collToken, collId, amount); } /// @dev Take some collateral back. Must only be called during execution. /// @param collToken The ERC1155 token to take back. /// @param collId The token id to take back. /// @param amount The amount of tokens to take back via transfer. function takeCollateral( address collToken, uint collId, uint amount ) external override inExec { Position storage pos = positions[POSITION_ID]; require(collToken == pos.collToken, 'invalid collateral token'); require(collId == pos.collId, 'invalid collateral token'); if (amount == uint(-1)) { amount = pos.collateralSize; } pos.collateralSize = pos.collateralSize.sub(amount); IERC1155(collToken).safeTransferFrom(address(this), msg.sender, collId, amount, ''); emit TakeCollateral(POSITION_ID, msg.sender, collToken, collId, amount); } /// @dev Internal function to perform borrow from the bank and return the amount received. /// @param token The token to perform borrow action. /// @param amountCall The amount use in the transferFrom call. /// NOTE: Caller must ensure that cToken interest was already accrued up to this block. function doBorrow(address token, uint amountCall) internal returns (uint) { Bank storage bank = banks[token]; // assume the input is already sanity checked. uint balanceBefore = IERC20(token).balanceOf(address(this)); require(ICErc20(bank.cToken).borrow(amountCall) == 0, 'bad borrow'); uint balanceAfter = IERC20(token).balanceOf(address(this)); bank.totalDebt = bank.totalDebt.add(amountCall); return balanceAfter.sub(balanceBefore); } /// @dev Internal function to perform repay to the bank and return the amount actually repaid. /// @param token The token to perform repay action. /// @param amountCall The amount to use in the repay call. /// NOTE: Caller must ensure that cToken interest was already accrued up to this block. function doRepay(address token, uint amountCall) internal returns (uint) { Bank storage bank = banks[token]; // assume the input is already sanity checked. ICErc20 cToken = ICErc20(bank.cToken); uint oldDebt = bank.totalDebt; require(cToken.repayBorrow(amountCall) == 0, 'bad repay'); uint newDebt = cToken.borrowBalanceStored(address(this)); bank.totalDebt = newDebt; return oldDebt.sub(newDebt); } /// @dev Internal function to perform ERC20 transfer in and return amount actually received. /// @param token The token to perform transferFrom action. /// @param amountCall The amount use in the transferFrom call. function doERC20TransferIn(address token, uint amountCall) internal returns (uint) { uint balanceBefore = IERC20(token).balanceOf(address(this)); IERC20(token).safeTransferFrom(msg.sender, address(this), amountCall); uint balanceAfter = IERC20(token).balanceOf(address(this)); return balanceAfter.sub(balanceBefore); } /// @dev Internal function to perform ERC1155 transfer in and return amount actually received. /// @param token The token to perform transferFrom action. /// @param id The id to perform transferFrom action. /// @param amountCall The amount use in the transferFrom call. function doERC1155TransferIn( address token, uint id, uint amountCall ) internal returns (uint) { uint balanceBefore = IERC1155(token).balanceOf(address(this), id); IERC1155(token).safeTransferFrom(msg.sender, address(this), id, amountCall, ''); uint balanceAfter = IERC1155(token).balanceOf(address(this), id); return balanceAfter.sub(balanceBefore); } }
pragma solidity 0.6.12; import 'OpenZeppelin/[email protected]/contracts/token/ERC20/ERC20.sol'; import 'OpenZeppelin/[email protected]/contracts/cryptography/MerkleProof.sol'; import 'OpenZeppelin/[email protected]/contracts/math/SafeMath.sol'; import 'OpenZeppelin/[email protected]/contracts/utils/ReentrancyGuard.sol'; import './Governable.sol'; import '../interfaces/ICErc20.sol'; import '../interfaces/IWETH.sol'; contract SafeBoxETH is Governable, ERC20, ReentrancyGuard { using SafeMath for uint; event Claim(address user, uint amount); ICErc20 public immutable cToken; IWETH public immutable weth; address public relayer; bytes32 public root; mapping(address => uint) public claimed; constructor( ICErc20 _cToken, string memory _name, string memory _symbol ) public ERC20(_name, _symbol) { IWETH _weth = IWETH(_cToken.underlying()); __Governable__init(); cToken = _cToken; weth = _weth; relayer = msg.sender; _weth.approve(address(_cToken), uint(-1)); } function setRelayer(address _relayer) external onlyGov { relayer = _relayer; } function updateRoot(bytes32 _root) external { require(msg.sender == relayer || msg.sender == governor, '!relayer'); root = _root; } function deposit() external payable nonReentrant { weth.deposit{value: msg.value}(); uint cBalanceBefore = cToken.balanceOf(address(this)); require(cToken.mint(msg.value) == 0, '!mint'); uint cBalanceAfter = cToken.balanceOf(address(this)); _mint(msg.sender, cBalanceAfter.sub(cBalanceBefore)); } function withdraw(uint amount) public nonReentrant { _burn(msg.sender, amount); uint wethBalanceBefore = weth.balanceOf(address(this)); require(cToken.redeem(amount) == 0, '!redeem'); uint wethBalanceAfter = weth.balanceOf(address(this)); uint wethAmount = wethBalanceAfter.sub(wethBalanceBefore); weth.withdraw(wethAmount); (bool success, ) = msg.sender.call{value: wethAmount}(new bytes(0)); require(success, '!withdraw'); } function claim(uint totalReward, bytes32[] memory proof) public nonReentrant { bytes32 leaf = keccak256(abi.encodePacked(msg.sender, totalReward)); require(MerkleProof.verify(proof, root, leaf), '!proof'); uint send = totalReward.sub(claimed[msg.sender]); claimed[msg.sender] = totalReward; weth.withdraw(send); (bool success, ) = msg.sender.call{value: send}(new bytes(0)); require(success, '!claim'); emit Claim(msg.sender, send); } function adminClaim(uint amount) external onlyGov { weth.withdraw(amount); (bool success, ) = msg.sender.call{value: amount}(new bytes(0)); require(success, '!adminClaim'); } function claimAndWithdraw( uint claimAmount, bytes32[] memory proof, uint withdrawAmount ) external { claim(claimAmount, proof); withdraw(withdrawAmount); } receive() external payable { require(msg.sender == address(weth), '!weth'); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "../../GSN/Context.sol"; import "./IERC20.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; using Address for address; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}; * * Requirements: * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies in extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return _functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./IERC20.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev These functions deal with verification of Merkle trees (hash trees), */ library MerkleProof { /** * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree * defined by `root`. For this, a `proof` must be provided, containing * sibling hashes on the branch from the leaf to the root of the tree. Each * pair of leaves and each pair of pre-images are assumed to be sorted. */ function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { bytes32 proofElement = proof[i]; if (computedHash <= proofElement) { // Hash(current computed hash + current element of the proof) computedHash = keccak256(abi.encodePacked(computedHash, proofElement)); } else { // Hash(current element of the proof + current computed hash) computedHash = keccak256(abi.encodePacked(proofElement, computedHash)); } } // Check if the computed hash (root) is equal to the provided root return computedHash == root; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor () internal { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.4.24 <0.7.0; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } /// @dev Returns true if and only if the function is running in the constructor function _isConstructor() private view returns (bool) { // extcodesize checks the size of the code stored in an address, and // address returns the current address. Since the code is still not // deployed when running a constructor, any checks on its code size will // yield zero, making it an effective way to detect if a contract is // under construction or not. address self = address(this); uint256 cs; // solhint-disable-next-line no-inline-assembly assembly { cs := extcodesize(self) } return cs == 0; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./IERC1155.sol"; import "./IERC1155MetadataURI.sol"; import "./IERC1155Receiver.sol"; import "../../GSN/Context.sol"; import "../../introspection/ERC165.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; /** * * @dev Implementation of the basic standard multi-token. * See https://eips.ethereum.org/EIPS/eip-1155 * Originally based on code by Enjin: https://github.com/enjin/erc-1155 * * _Available since v3.1._ */ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI { using SafeMath for uint256; using Address for address; // Mapping from token ID to account balances mapping (uint256 => mapping(address => uint256)) private _balances; // Mapping from account to operator approvals mapping (address => mapping(address => bool)) private _operatorApprovals; // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json string private _uri; /* * bytes4(keccak256('balanceOf(address,uint256)')) == 0x00fdd58e * bytes4(keccak256('balanceOfBatch(address[],uint256[])')) == 0x4e1273f4 * bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465 * bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5 * bytes4(keccak256('safeTransferFrom(address,address,uint256,uint256,bytes)')) == 0xf242432a * bytes4(keccak256('safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)')) == 0x2eb2c2d6 * * => 0x00fdd58e ^ 0x4e1273f4 ^ 0xa22cb465 ^ * 0xe985e9c5 ^ 0xf242432a ^ 0x2eb2c2d6 == 0xd9b67a26 */ bytes4 private constant _INTERFACE_ID_ERC1155 = 0xd9b67a26; /* * bytes4(keccak256('uri(uint256)')) == 0x0e89341c */ bytes4 private constant _INTERFACE_ID_ERC1155_METADATA_URI = 0x0e89341c; /** * @dev See {_setURI}. */ constructor (string memory uri) public { _setURI(uri); // register the supported interfaces to conform to ERC1155 via ERC165 _registerInterface(_INTERFACE_ID_ERC1155); // register the supported interfaces to conform to ERC1155MetadataURI via ERC165 _registerInterface(_INTERFACE_ID_ERC1155_METADATA_URI); } /** * @dev See {IERC1155MetadataURI-uri}. * * This implementation returns the same URI for *all* token types. It relies * on the token type ID substitution mechanism * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP]. * * Clients calling this function must replace the `\{id\}` substring with the * actual token type ID. */ function uri(uint256) external view override returns (string memory) { return _uri; } /** * @dev See {IERC1155-balanceOf}. * * Requirements: * * - `account` cannot be the zero address. */ function balanceOf(address account, uint256 id) public view override returns (uint256) { require(account != address(0), "ERC1155: balance query for the zero address"); return _balances[id][account]; } /** * @dev See {IERC1155-balanceOfBatch}. * * Requirements: * * - `accounts` and `ids` must have the same length. */ function balanceOfBatch( address[] memory accounts, uint256[] memory ids ) public view override returns (uint256[] memory) { require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch"); uint256[] memory batchBalances = new uint256[](accounts.length); for (uint256 i = 0; i < accounts.length; ++i) { require(accounts[i] != address(0), "ERC1155: batch balance query for the zero address"); batchBalances[i] = _balances[ids[i]][accounts[i]]; } return batchBalances; } /** * @dev See {IERC1155-setApprovalForAll}. */ function setApprovalForAll(address operator, bool approved) public virtual override { require(_msgSender() != operator, "ERC1155: setting approval status for self"); _operatorApprovals[_msgSender()][operator] = approved; emit ApprovalForAll(_msgSender(), operator, approved); } /** * @dev See {IERC1155-isApprovedForAll}. */ function isApprovedForAll(address account, address operator) public view override returns (bool) { return _operatorApprovals[account][operator]; } /** * @dev See {IERC1155-safeTransferFrom}. */ function safeTransferFrom( address from, address to, uint256 id, uint256 amount, bytes memory data ) public virtual override { require(to != address(0), "ERC1155: transfer to the zero address"); require( from == _msgSender() || isApprovedForAll(from, _msgSender()), "ERC1155: caller is not owner nor approved" ); address operator = _msgSender(); _beforeTokenTransfer(operator, from, to, _asSingletonArray(id), _asSingletonArray(amount), data); _balances[id][from] = _balances[id][from].sub(amount, "ERC1155: insufficient balance for transfer"); _balances[id][to] = _balances[id][to].add(amount); emit TransferSingle(operator, from, to, id, amount); _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data); } /** * @dev See {IERC1155-safeBatchTransferFrom}. */ function safeBatchTransferFrom( address from, address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data ) public virtual override { require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); require(to != address(0), "ERC1155: transfer to the zero address"); require( from == _msgSender() || isApprovedForAll(from, _msgSender()), "ERC1155: transfer caller is not owner nor approved" ); address operator = _msgSender(); _beforeTokenTransfer(operator, from, to, ids, amounts, data); for (uint256 i = 0; i < ids.length; ++i) { uint256 id = ids[i]; uint256 amount = amounts[i]; _balances[id][from] = _balances[id][from].sub( amount, "ERC1155: insufficient balance for transfer" ); _balances[id][to] = _balances[id][to].add(amount); } emit TransferBatch(operator, from, to, ids, amounts); _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data); } /** * @dev Sets a new URI for all token types, by relying on the token type ID * substitution mechanism * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP]. * * By this mechanism, any occurrence of the `\{id\}` substring in either the * URI or any of the amounts in the JSON file at said URI will be replaced by * clients with the token type ID. * * For example, the `https://token-cdn-domain/\{id\}.json` URI would be * interpreted by clients as * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json` * for token type ID 0x4cce0. * * See {uri}. * * Because these URIs cannot be meaningfully represented by the {URI} event, * this function emits no events. */ function _setURI(string memory newuri) internal virtual { _uri = newuri; } /** * @dev Creates `amount` tokens of token type `id`, and assigns them to `account`. * * Emits a {TransferSingle} event. * * Requirements: * * - `account` cannot be the zero address. * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the * acceptance magic value. */ function _mint(address account, uint256 id, uint256 amount, bytes memory data) internal virtual { require(account != address(0), "ERC1155: mint to the zero address"); address operator = _msgSender(); _beforeTokenTransfer(operator, address(0), account, _asSingletonArray(id), _asSingletonArray(amount), data); _balances[id][account] = _balances[id][account].add(amount); emit TransferSingle(operator, address(0), account, id, amount); _doSafeTransferAcceptanceCheck(operator, address(0), account, id, amount, data); } /** * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}. * * Requirements: * * - `ids` and `amounts` must have the same length. * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the * acceptance magic value. */ function _mintBatch(address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data) internal virtual { require(to != address(0), "ERC1155: mint to the zero address"); require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); address operator = _msgSender(); _beforeTokenTransfer(operator, address(0), to, ids, amounts, data); for (uint i = 0; i < ids.length; i++) { _balances[ids[i]][to] = amounts[i].add(_balances[ids[i]][to]); } emit TransferBatch(operator, address(0), to, ids, amounts); _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data); } /** * @dev Destroys `amount` tokens of token type `id` from `account` * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens of token type `id`. */ function _burn(address account, uint256 id, uint256 amount) internal virtual { require(account != address(0), "ERC1155: burn from the zero address"); address operator = _msgSender(); _beforeTokenTransfer(operator, account, address(0), _asSingletonArray(id), _asSingletonArray(amount), ""); _balances[id][account] = _balances[id][account].sub( amount, "ERC1155: burn amount exceeds balance" ); emit TransferSingle(operator, account, address(0), id, amount); } /** * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}. * * Requirements: * * - `ids` and `amounts` must have the same length. */ function _burnBatch(address account, uint256[] memory ids, uint256[] memory amounts) internal virtual { require(account != address(0), "ERC1155: burn from the zero address"); require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); address operator = _msgSender(); _beforeTokenTransfer(operator, account, address(0), ids, amounts, ""); for (uint i = 0; i < ids.length; i++) { _balances[ids[i]][account] = _balances[ids[i]][account].sub( amounts[i], "ERC1155: burn amount exceeds balance" ); } emit TransferBatch(operator, account, address(0), ids, amounts); } /** * @dev Hook that is called before any token transfer. This includes minting * and burning, as well as batched variants. * * The same hook is called on both single and batched variants. For single * transfers, the length of the `id` and `amount` arrays will be 1. * * Calling conditions (for each `id` and `amount` pair): * * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens * of token type `id` will be transferred to `to`. * - When `from` is zero, `amount` tokens of token type `id` will be minted * for `to`. * - when `to` is zero, `amount` of ``from``'s tokens of token type `id` * will be burned. * - `from` and `to` are never both zero. * - `ids` and `amounts` have the same, non-zero length. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address operator, address from, address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data ) internal virtual { } function _doSafeTransferAcceptanceCheck( address operator, address from, address to, uint256 id, uint256 amount, bytes memory data ) private { if (to.isContract()) { try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) { if (response != IERC1155Receiver(to).onERC1155Received.selector) { revert("ERC1155: ERC1155Receiver rejected tokens"); } } catch Error(string memory reason) { revert(reason); } catch { revert("ERC1155: transfer to non ERC1155Receiver implementer"); } } } function _doSafeBatchTransferAcceptanceCheck( address operator, address from, address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data ) private { if (to.isContract()) { try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (bytes4 response) { if (response != IERC1155Receiver(to).onERC1155BatchReceived.selector) { revert("ERC1155: ERC1155Receiver rejected tokens"); } } catch Error(string memory reason) { revert(reason); } catch { revert("ERC1155: transfer to non ERC1155Receiver implementer"); } } } function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) { uint256[] memory array = new uint256[](1); array[0] = element; return array; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; import "../../introspection/IERC165.sol"; /** * @dev Required interface of an ERC1155 compliant contract, as defined in the * https://eips.ethereum.org/EIPS/eip-1155[EIP]. * * _Available since v3.1._ */ interface IERC1155 is IERC165 { /** * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`. */ event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value); /** * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all * transfers. */ event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values); /** * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to * `approved`. */ event ApprovalForAll(address indexed account, address indexed operator, bool approved); /** * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI. * * If an {URI} event was emitted for `id`, the standard * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value * returned by {IERC1155MetadataURI-uri}. */ event URI(string value, uint256 indexed id); /** * @dev Returns the amount of tokens of token type `id` owned by `account`. * * Requirements: * * - `account` cannot be the zero address. */ function balanceOf(address account, uint256 id) external view returns (uint256); /** * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}. * * Requirements: * * - `accounts` and `ids` must have the same length. */ function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory); /** * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`, * * Emits an {ApprovalForAll} event. * * Requirements: * * - `operator` cannot be the caller. */ function setApprovalForAll(address operator, bool approved) external; /** * @dev Returns true if `operator` is approved to transfer ``account``'s tokens. * * See {setApprovalForAll}. */ function isApprovedForAll(address account, address operator) external view returns (bool); /** * @dev Transfers `amount` tokens of token type `id` from `from` to `to`. * * Emits a {TransferSingle} event. * * Requirements: * * - `to` cannot be the zero address. * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}. * - `from` must have a balance of tokens of type `id` of at least `amount`. * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the * acceptance magic value. */ function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external; /** * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}. * * Emits a {TransferBatch} event. * * Requirements: * * - `ids` and `amounts` must have the same length. * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the * acceptance magic value. */ function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; import "./IERC1155.sol"; /** * @dev Interface of the optional ERC1155MetadataExtension interface, as defined * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP]. * * _Available since v3.1._ */ interface IERC1155MetadataURI is IERC1155 { /** * @dev Returns the URI for token type `id`. * * If the `\{id\}` substring is present in the URI, it must be replaced by * clients with the actual token type ID. */ function uri(uint256 id) external view returns (string memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "../../introspection/IERC165.sol"; /** * _Available since v3.1._ */ interface IERC1155Receiver is IERC165 { /** @dev Handles the receipt of a single ERC1155 token type. This function is called at the end of a `safeTransferFrom` after the balance has been updated. To accept the transfer, this must return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` (i.e. 0xf23a6e61, or its own function selector). @param operator The address which initiated the transfer (i.e. msg.sender) @param from The address which previously owned the token @param id The ID of the token being transferred @param value The amount of tokens being transferred @param data Additional data with no specified format @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed */ function onERC1155Received( address operator, address from, uint256 id, uint256 value, bytes calldata data ) external returns(bytes4); /** @dev Handles the receipt of a multiple ERC1155 token types. This function is called at the end of a `safeBatchTransferFrom` after the balances have been updated. To accept the transfer(s), this must return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` (i.e. 0xbc197c81, or its own function selector). @param operator The address which initiated the batch transfer (i.e. msg.sender) @param from The address which previously owned the token @param ids An array containing ids of each token being transferred (order and length must match values array) @param values An array containing amounts of each token being transferred (order and length must match ids array) @param data Additional data with no specified format @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed */ function onERC1155BatchReceived( address operator, address from, uint256[] calldata ids, uint256[] calldata values, bytes calldata data ) external returns(bytes4); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts may inherit from this and call {_registerInterface} to declare * their support of an interface. */ contract ERC165 is IERC165 { /* * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 */ bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /** * @dev Mapping of interface ids to whether or not it's supported. */ mapping(bytes4 => bool) private _supportedInterfaces; constructor () internal { // Derived contracts need only register support for their own interfaces, // we register support for ERC165 itself here _registerInterface(_INTERFACE_ID_ERC165); } /** * @dev See {IERC165-supportsInterface}. * * Time complexity O(1), guaranteed to always use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) public view override returns (bool) { return _supportedInterfaces[interfaceId]; } /** * @dev Registers the contract as an implementer of the interface defined by * `interfaceId`. Support of the actual ERC165 interface is automatic and * registering its interface id is not required. * * See {IERC165-supportsInterface}. * * Requirements: * * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`). */ function _registerInterface(bytes4 interfaceId) internal virtual { require(interfaceId != 0xffffffff, "ERC165: invalid interface id"); _supportedInterfaces[interfaceId] = true; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./IERC1155Receiver.sol"; import "../../introspection/ERC165.sol"; /** * @dev _Available since v3.1._ */ abstract contract ERC1155Receiver is ERC165, IERC1155Receiver { constructor() public { _registerInterface( ERC1155Receiver(0).onERC1155Received.selector ^ ERC1155Receiver(0).onERC1155BatchReceived.selector ); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow, so we distribute return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2); } }
{ "metadata": { "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"address","name":"_staking","type":"address"},{"internalType":"address","name":"_underlying","type":"address"},{"internalType":"address","name":"_reward","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"ids","type":"uint256[]"},{"indexed":false,"internalType":"uint256[]","name":"values","type":"uint256[]"}],"name":"TransferBatch","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"id","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"TransferSingle","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"value","type":"string"},{"indexed":true,"internalType":"uint256","name":"id","type":"uint256"}],"name":"URI","type":"event"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"accounts","type":"address[]"},{"internalType":"uint256[]","name":"ids","type":"uint256[]"}],"name":"balanceOfBatch","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"getUnderlyingRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"getUnderlyingToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"reward","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256[]","name":"ids","type":"uint256[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeBatchTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"staking","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"uri","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000b9840a4a8a671f79de3df3b812feeb38047ce552000000000000000000000000f54025af2dc86809be1153c1f20d77adb7e8ecf4000000000000000000000000bc396689893d065f41bc2c6ecbee5e0085233447
-----Decoded View---------------
Arg [0] : _staking (address): 0xb9840A4A8a671f79DE3Df3b812fEEb38047CE552
Arg [1] : _underlying (address): 0xF54025aF2dc86809Be1153c1F20D77ADB7e8ecF4
Arg [2] : _reward (address): 0xbC396689893D065F41bc2C6EcbeE5e0085233447
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000b9840a4a8a671f79de3df3b812feeb38047ce552
Arg [1] : 000000000000000000000000f54025af2dc86809be1153c1f20d77adb7e8ecf4
Arg [2] : 000000000000000000000000bc396689893d065f41bc2c6ecbee5e0085233447
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://1567363968158a6b06519cb5b8e443aee1cb09cfa439e1e1ceea8b010e710abb
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