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Contract Name:
iToken
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "@openzeppelin/contracts-upgradeable/token/ERC20/SafeERC20Upgradeable.sol"; import "./TokenBase/Base.sol"; /** * @title dForce's Lending Protocol Contract. * @notice iTokens which wrap an EIP-20 underlying. * @author dForce Team. */ contract iToken is Base { using SafeERC20Upgradeable for IERC20Upgradeable; /** * @notice Expects to call only once to initialize a new market. * @param _underlyingToken The underlying token address. * @param _name Token name. * @param _symbol Token symbol. * @param _controller Core controller contract address. * @param _interestRateModel Token interest rate model contract address. */ function initialize( address _underlyingToken, string memory _name, string memory _symbol, IControllerInterface _controller, IInterestRateModelInterface _interestRateModel ) external initializer { _initialize( _name, _symbol, ERC20(_underlyingToken).decimals(), _controller, _interestRateModel ); underlying = IERC20Upgradeable(_underlyingToken); } /** * @notice In order to support deflationary token, returns the changed amount. * @dev Similar to EIP20 transfer, except it handles a False result from `transferFrom`. */ function _doTransferIn(address _spender, uint256 _amount) internal override returns (uint256) { uint256 _balanceBefore = underlying.balanceOf(address(this)); underlying.safeTransferFrom(_spender, address(this), _amount); return underlying.balanceOf(address(this)).sub(_balanceBefore); } /** * @dev Similar to EIP20 transfer, except it handles a False result from `transfer`. */ function _doTransferOut(address payable _recipient, uint256 _amount) internal override { underlying.safeTransfer(_recipient, _amount); } /** * @dev Gets balance of this contract in terms of the underlying */ function _getCurrentCash() internal view override returns (uint256) { return underlying.balanceOf(address(this)); } /** * @dev Caller deposits assets into the market and `_recipient` receives iToken in exchange. * @param _recipient The account that would receive the iToken. * @param _mintAmount The amount of the underlying token to deposit. */ function mint(address _recipient, uint256 _mintAmount) external nonReentrant settleInterest { _mintInternal(_recipient, _mintAmount); } /** * @dev Caller redeems specified iToken from `_from` to get underlying token. * @param _from The account that would burn the iToken. * @param _redeemiToken The number of iToken to redeem. */ function redeem(address _from, uint256 _redeemiToken) external nonReentrant settleInterest { _redeemInternal( _from, _redeemiToken, _redeemiToken.rmul(_exchangeRateInternal()) ); } /** * @dev Caller redeems specified underlying from `_from` to get underlying token. * @param _from The account that would burn the iToken. * @param _redeemUnderlying The number of underlying to redeem. */ function redeemUnderlying(address _from, uint256 _redeemUnderlying) external nonReentrant settleInterest { _redeemInternal( _from, _redeemUnderlying.rdivup(_exchangeRateInternal()), _redeemUnderlying ); } /** * @dev Caller borrows tokens from the protocol to their own address. * @param _borrowAmount The amount of the underlying token to borrow. */ function borrow(uint256 _borrowAmount) external nonReentrant settleInterest { _borrowInternal(msg.sender, _borrowAmount); } /** * @dev Caller repays their own borrow. * @param _repayAmount The amount to repay. */ function repayBorrow(uint256 _repayAmount) external nonReentrant settleInterest { _repayInternal(msg.sender, msg.sender, _repayAmount); } /** * @dev Caller repays a borrow belonging to borrower. * @param _borrower the account with the debt being payed off. * @param _repayAmount The amount to repay. */ function repayBorrowBehalf(address _borrower, uint256 _repayAmount) external nonReentrant settleInterest { _repayInternal(msg.sender, _borrower, _repayAmount); } /** * @dev The caller liquidates the borrowers collateral. * @param _borrower The account whose borrow should be liquidated. * @param _assetCollateral The market in which to seize collateral from the borrower. * @param _repayAmount The amount to repay. */ function liquidateBorrow( address _borrower, uint256 _repayAmount, address _assetCollateral ) external nonReentrant settleInterest { _liquidateBorrowInternal(_borrower, _repayAmount, _assetCollateral); } /** * @dev Transfers this tokens to the liquidator. * @param _liquidator The account receiving seized collateral. * @param _borrower The account having collateral seized. * @param _seizeTokens The number of iTokens to seize. */ function seize( address _liquidator, address _borrower, uint256 _seizeTokens ) external override nonReentrant { _seizeInternal(msg.sender, _liquidator, _borrower, _seizeTokens); } /** * @notice Calculates interest and update total borrows and reserves. * @dev Updates total borrows and reserves with any accumulated interest. */ function updateInterest() external override returns (bool) { _updateInterest(); return true; } /** * @dev Gets the newest exchange rate by accruing interest. */ function exchangeRateCurrent() external returns (uint256) { // Accrues interest. _updateInterest(); return _exchangeRateInternal(); } /** * @dev Calculates the exchange rate without accruing interest. */ function exchangeRateStored() external view override returns (uint256) { return _exchangeRateInternal(); } /** * @dev Gets the underlying balance of the `_account`. * @param _account The address of the account to query. */ function balanceOfUnderlying(address _account) external returns (uint256) { // Accrues interest. _updateInterest(); return _exchangeRateInternal().rmul(balanceOf[_account]); } /** * @dev Gets the user's borrow balance with the latest `borrowIndex`. */ function borrowBalanceCurrent(address _account) external nonReentrant returns (uint256) { // Accrues interest. _updateInterest(); return _borrowBalanceInternal(_account); } /** * @dev Gets the borrow balance of user without accruing interest. */ function borrowBalanceStored(address _account) external view override returns (uint256) { return _borrowBalanceInternal(_account); } /** * @dev Gets user borrowing information. */ function borrowSnapshot(address _account) external view returns (uint256, uint256) { return ( accountBorrows[_account].principal, accountBorrows[_account].interestIndex ); } /** * @dev Gets the current total borrows by accruing interest. */ function totalBorrowsCurrent() external returns (uint256) { // Accrues interest. _updateInterest(); return totalBorrows; } /** * @dev Returns the current per-block borrow interest rate. */ function borrowRatePerBlock() public view returns (uint256) { return interestRateModel.getBorrowRate( _getCurrentCash(), totalBorrows, totalReserves ); } /** * @dev Returns the current per-block supply interest rate. * Calculates the supply rate: * underlying = totalSupply × exchangeRate * borrowsPer = totalBorrows ÷ underlying * supplyRate = borrowRate × (1-reserveFactor) × borrowsPer */ function supplyRatePerBlock() external view returns (uint256) { // `_underlyingScaled` is scaled by 1e36. uint256 _underlyingScaled = totalSupply.mul(_exchangeRateInternal()); if (_underlyingScaled == 0) return 0; uint256 _totalBorrowsScaled = totalBorrows.mul(BASE); return borrowRatePerBlock().tmul( BASE.sub(reserveRatio), _totalBorrowsScaled.rdiv(_underlyingScaled) ); } /** * @dev Get cash balance of this iToken in the underlying token. */ function getCash() external view returns (uint256) { return _getCurrentCash(); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "./IERC20Upgradeable.sol"; import "../../math/SafeMathUpgradeable.sol"; import "../../utils/AddressUpgradeable.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 SafeERC20Upgradeable { using SafeMathUpgradeable for uint256; using AddressUpgradeable for address; function safeTransfer(IERC20Upgradeable token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20Upgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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(IERC20Upgradeable 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 0.6.12; import "../interface/IFlashloanExecutor.sol"; import "../library/SafeRatioMath.sol"; import "./TokenERC20.sol"; /** * @title dForce's lending Base Contract * @author dForce */ abstract contract Base is TokenERC20 { using SafeRatioMath for uint256; /** * @notice Expects to call only once to create a new lending market. * @param _name Token name. * @param _symbol Token symbol. * @param _controller Core controller contract address. * @param _interestRateModel Token interest rate model contract address. */ function _initialize( string memory _name, string memory _symbol, uint8 _decimals, IControllerInterface _controller, IInterestRateModelInterface _interestRateModel ) internal virtual { controller = _controller; interestRateModel = _interestRateModel; accrualBlockNumber = block.number; borrowIndex = BASE; flashloanFeeRatio = 0.0008e18; protocolFeeRatio = 0.25e18; __Ownable_init(); __ERC20_init(_name, _symbol, _decimals); __ReentrancyGuard_init(); uint256 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) ) ); } /*********************************/ /******** Security Check *********/ /*********************************/ /** * @notice Ensure this is a iToken contract. */ function isiToken() external pure returns (bool) { return true; } //---------------------------------- //******** Main calculation ******** //---------------------------------- struct InterestLocalVars { uint256 borrowRate; uint256 currentBlockNumber; uint256 currentCash; uint256 totalBorrows; uint256 totalReserves; uint256 borrowIndex; uint256 blockDelta; uint256 simpleInterestFactor; uint256 interestAccumulated; uint256 newTotalBorrows; uint256 newTotalReserves; uint256 newBorrowIndex; } /** * @notice Calculates interest and update total borrows and reserves. * @dev Updates total borrows and reserves with any accumulated interest. */ function _updateInterest() internal virtual override { InterestLocalVars memory _vars; _vars.currentCash = _getCurrentCash(); _vars.totalBorrows = totalBorrows; _vars.totalReserves = totalReserves; // Gets the current borrow interest rate. _vars.borrowRate = interestRateModel.getBorrowRate( _vars.currentCash, _vars.totalBorrows, _vars.totalReserves ); require( _vars.borrowRate <= maxBorrowRate, "_updateInterest: Borrow rate is too high!" ); // Records the current block number. _vars.currentBlockNumber = block.number; // Calculates the number of blocks elapsed since the last accrual. _vars.blockDelta = _vars.currentBlockNumber.sub(accrualBlockNumber); /** * Calculates the interest accumulated into borrows and reserves and the new index: * simpleInterestFactor = borrowRate * blockDelta * interestAccumulated = simpleInterestFactor * totalBorrows * newTotalBorrows = interestAccumulated + totalBorrows * newTotalReserves = interestAccumulated * reserveFactor + totalReserves * newBorrowIndex = simpleInterestFactor * borrowIndex + borrowIndex */ _vars.simpleInterestFactor = _vars.borrowRate.mul(_vars.blockDelta); _vars.interestAccumulated = _vars.simpleInterestFactor.rmul( _vars.totalBorrows ); _vars.newTotalBorrows = _vars.interestAccumulated.add( _vars.totalBorrows ); _vars.newTotalReserves = reserveRatio .rmul(_vars.interestAccumulated) .add(_vars.totalReserves); _vars.borrowIndex = borrowIndex; _vars.newBorrowIndex = _vars .simpleInterestFactor .rmul(_vars.borrowIndex) .add(_vars.borrowIndex); // Writes the previously calculated values into storage. accrualBlockNumber = _vars.currentBlockNumber; borrowIndex = _vars.newBorrowIndex; totalBorrows = _vars.newTotalBorrows; totalReserves = _vars.newTotalReserves; // Emits an `UpdateInterest` event. emit UpdateInterest( _vars.currentBlockNumber, _vars.interestAccumulated, _vars.newBorrowIndex, _vars.currentCash, _vars.newTotalBorrows, _vars.newTotalReserves ); } struct MintLocalVars { uint256 exchangeRate; uint256 mintTokens; uint256 actualMintAmout; } /** * @dev User deposits token into the market and `_recipient` gets iToken. * @param _recipient The address of the user to get iToken. * @param _mintAmount The amount of the underlying token to deposit. */ function _mintInternal(address _recipient, uint256 _mintAmount) internal virtual { controller.beforeMint(address(this), _recipient, _mintAmount); MintLocalVars memory _vars; /** * Gets the current exchange rate and calculate the number of iToken to be minted: * mintTokens = mintAmount / exchangeRate */ _vars.exchangeRate = _exchangeRateInternal(); // Transfers `_mintAmount` from caller to contract, and returns the actual amount the contract // get, cause some tokens may be charged. _vars.actualMintAmout = _doTransferIn(msg.sender, _mintAmount); // Supports deflationary tokens. _vars.mintTokens = _vars.actualMintAmout.rdiv(_vars.exchangeRate); // Mints `mintTokens` iToken to `_recipient`. _mint(_recipient, _vars.mintTokens); controller.afterMint( address(this), _recipient, _mintAmount, _vars.mintTokens ); emit Mint(msg.sender, _recipient, _mintAmount, _vars.mintTokens); } /** * @notice This is a common function to redeem, so only one of `_redeemiTokenAmount` or * `_redeemUnderlyingAmount` may be non-zero. * @dev Caller redeems undelying token based on the input amount of iToken or underlying token. * @param _from The address of the account which will spend underlying token. * @param _redeemiTokenAmount The number of iTokens to redeem into underlying. * @param _redeemUnderlyingAmount The number of underlying tokens to receive. */ function _redeemInternal( address _from, uint256 _redeemiTokenAmount, uint256 _redeemUnderlyingAmount ) internal virtual { require( _redeemiTokenAmount > 0, "_redeemInternal: Redeem iToken amount should be greater than zero!" ); controller.beforeRedeem(address(this), _from, _redeemiTokenAmount); if (msg.sender != _from) _approve( _from, msg.sender, allowance[_from][msg.sender].sub(_redeemiTokenAmount) ); _burn(_from, _redeemiTokenAmount); /** * Transfers `_redeemUnderlyingAmount` underlying token to caller. */ _doTransferOut(msg.sender, _redeemUnderlyingAmount); controller.afterRedeem( address(this), _from, _redeemiTokenAmount, _redeemUnderlyingAmount ); emit Redeem( _from, msg.sender, _redeemiTokenAmount, _redeemUnderlyingAmount ); } /** * @dev Caller borrows assets from the protocol. * @param _borrower The account that will borrow tokens. * @param _borrowAmount The amount of the underlying asset to borrow. */ function _borrowInternal(address payable _borrower, uint256 _borrowAmount) internal virtual { controller.beforeBorrow(address(this), _borrower, _borrowAmount); // Calculates the new borrower and total borrow balances: // newAccountBorrows = accountBorrows + borrowAmount // newTotalBorrows = totalBorrows + borrowAmount BorrowSnapshot storage borrowSnapshot = accountBorrows[_borrower]; borrowSnapshot.principal = _borrowBalanceInternal(_borrower).add( _borrowAmount ); borrowSnapshot.interestIndex = borrowIndex; totalBorrows = totalBorrows.add(_borrowAmount); // Transfers token to borrower. _doTransferOut(_borrower, _borrowAmount); controller.afterBorrow(address(this), _borrower, _borrowAmount); emit Borrow( _borrower, _borrowAmount, borrowSnapshot.principal, borrowSnapshot.interestIndex, totalBorrows ); } /** * @notice Please approve enough amount at first!!! If not, * maybe you will get an error: `SafeMath: subtraction overflow` * @dev `_payer` repays `_repayAmount` tokens for `_borrower`. * @param _payer The account to pay for the borrowed. * @param _borrower The account with the debt being payed off. * @param _repayAmount The amount to repay (or -1 for max). */ function _repayInternal( address _payer, address _borrower, uint256 _repayAmount ) internal virtual returns (uint256) { controller.beforeRepayBorrow( address(this), _payer, _borrower, _repayAmount ); // Calculates the latest borrowed amount by the new market borrowed index. uint256 _accountBorrows = _borrowBalanceInternal(_borrower); // Transfers the token into the market to repay. uint256 _actualRepayAmount = _doTransferIn( _payer, _repayAmount > _accountBorrows ? _accountBorrows : _repayAmount ); // Calculates the `_borrower` new borrow balance and total borrow balances: // accountBorrows[_borrower].principal = accountBorrows - actualRepayAmount // newTotalBorrows = totalBorrows - actualRepayAmount // Saves borrower updates. BorrowSnapshot storage borrowSnapshot = accountBorrows[_borrower]; borrowSnapshot.principal = _accountBorrows.sub(_actualRepayAmount); borrowSnapshot.interestIndex = borrowIndex; totalBorrows = totalBorrows < _actualRepayAmount ? 0 : totalBorrows.sub(_actualRepayAmount); // Defense hook. controller.afterRepayBorrow( address(this), _payer, _borrower, _actualRepayAmount ); emit RepayBorrow( _payer, _borrower, _actualRepayAmount, borrowSnapshot.principal, borrowSnapshot.interestIndex, totalBorrows ); return _actualRepayAmount; } /** * @dev The caller repays some of borrow and receive collateral. * @param _borrower The account whose borrow should be liquidated. * @param _repayAmount The amount to repay. * @param _assetCollateral The market in which to seize collateral from the borrower. */ function _liquidateBorrowInternal( address _borrower, uint256 _repayAmount, address _assetCollateral ) internal virtual { require( msg.sender != _borrower, "_liquidateBorrowInternal: Liquidator can not be borrower!" ); // According to the parameter `_repayAmount` to see what is the exact error. require( _repayAmount != 0, "_liquidateBorrowInternal: Liquidate amount should be greater than 0!" ); // Accrues interest for collateral asset. Base _dlCollateral = Base(_assetCollateral); _dlCollateral.updateInterest(); controller.beforeLiquidateBorrow( address(this), _assetCollateral, msg.sender, _borrower, _repayAmount ); require( _dlCollateral.accrualBlockNumber() == block.number, "_liquidateBorrowInternal: Failed to update block number in collateral asset!" ); uint256 _actualRepayAmount = _repayInternal(msg.sender, _borrower, _repayAmount); // Calculates the number of collateral tokens that will be seized uint256 _seizeTokens = controller.liquidateCalculateSeizeTokens( address(this), _assetCollateral, _actualRepayAmount ); // If this is also the collateral, calls seizeInternal to avoid re-entrancy, // otherwise make an external call. if (_assetCollateral == address(this)) { _seizeInternal(address(this), msg.sender, _borrower, _seizeTokens); } else { _dlCollateral.seize(msg.sender, _borrower, _seizeTokens); } controller.afterLiquidateBorrow( address(this), _assetCollateral, msg.sender, _borrower, _actualRepayAmount, _seizeTokens ); emit LiquidateBorrow( msg.sender, _borrower, _actualRepayAmount, _assetCollateral, _seizeTokens ); } /** * @dev Transfers this token to the liquidator. * @param _seizerToken The contract seizing the collateral. * @param _liquidator The account receiving seized collateral. * @param _borrower The account having collateral seized. * @param _seizeTokens The number of iTokens to seize. */ function _seizeInternal( address _seizerToken, address _liquidator, address _borrower, uint256 _seizeTokens ) internal virtual { require( _borrower != _liquidator, "seize: Liquidator can not be borrower!" ); controller.beforeSeize( address(this), _seizerToken, _liquidator, _borrower, _seizeTokens ); /** * Calculates the new _borrower and _liquidator token balances, * that is transfer `_seizeTokens` iToken from `_borrower` to `_liquidator`. */ _transfer(_borrower, _liquidator, _seizeTokens); // Hook checks. controller.afterSeize( address(this), _seizerToken, _liquidator, _borrower, _seizeTokens ); } /** * @param _account The address whose balance should be calculated. */ function _borrowBalanceInternal(address _account) internal view virtual returns (uint256) { // Gets stored borrowed data of the `_account`. BorrowSnapshot storage borrowSnapshot = accountBorrows[_account]; // If borrowBalance = 0, return 0 directly. if (borrowSnapshot.principal == 0 || borrowSnapshot.interestIndex == 0) return 0; // Calculate new borrow balance with market new borrow index: // recentBorrowBalance = borrower.borrowBalance * market.borrowIndex / borrower.borrowIndex return borrowSnapshot.principal.mul(borrowIndex).divup( borrowSnapshot.interestIndex ); } /** * @dev Calculates the exchange rate from the underlying token to the iToken. */ function _exchangeRateInternal() internal view virtual returns (uint256) { if (totalSupply == 0) { // This is the first time to mint, so current exchange rate is equal to initial exchange rate. return initialExchangeRate; } else { // exchangeRate = (totalCash + totalBorrows - totalReserves) / totalSupply return _getCurrentCash().add(totalBorrows).sub(totalReserves).rdiv( totalSupply ); } } function updateInterest() external virtual returns (bool); /** * @dev EIP2612 permit function. For more details, please look at here: * https://eips.ethereum.org/EIPS/eip-2612 * @param _owner The owner of the funds. * @param _spender The spender. * @param _value The amount. * @param _deadline The deadline timestamp, type(uint256).max for max deadline. * @param _v Signature param. * @param _s Signature param. * @param _r Signature param. */ function permit( address _owner, address _spender, uint256 _value, uint256 _deadline, uint8 _v, bytes32 _r, bytes32 _s ) external { require(_deadline >= block.timestamp, "permit: EXPIRED!"); uint256 _currentNonce = nonces[_owner]; bytes32 _digest = keccak256( abi.encodePacked( "\x19\x01", DOMAIN_SEPARATOR, keccak256( abi.encode( PERMIT_TYPEHASH, _owner, _spender, _value, _currentNonce, _deadline ) ) ) ); address _recoveredAddress = ecrecover(_digest, _v, _r, _s); require( _recoveredAddress != address(0) && _recoveredAddress == _owner, "permit: INVALID_SIGNATURE!" ); nonces[_owner] = _currentNonce.add(1); _approve(_owner, _spender, _value); } /** * @dev Transfers this tokens to the liquidator. * @param _liquidator The account receiving seized collateral. * @param _borrower The account having collateral seized. * @param _seizeTokens The number of iTokens to seize. */ function seize( address _liquidator, address _borrower, uint256 _seizeTokens ) external virtual; /** * @notice Users are expected to have enough allowance and balance before calling. * @dev Transfers asset in. */ function _doTransferIn(address _spender, uint256 _amount) internal virtual returns (uint256); function exchangeRateStored() external view virtual returns (uint256); function borrowBalanceStored(address _account) external view virtual returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20Upgradeable { /** * @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 <0.8.0; /** * @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 SafeMathUpgradeable { /** * @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 <0.8.0; /** * @dev Collection of functions related to the address type */ library AddressUpgradeable { /** * @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 on 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"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { 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 0.6.12; interface IFlashloanExecutor { function executeOperation( address reserve, uint256 amount, uint256 fee, bytes memory data ) external; }
//SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol"; library SafeRatioMath { using SafeMathUpgradeable for uint256; uint256 private constant BASE = 10**18; uint256 private constant DOUBLE = 10**36; function divup(uint256 x, uint256 y) internal pure returns (uint256 z) { z = x.add(y.sub(1)).div(y); } function rmul(uint256 x, uint256 y) internal pure returns (uint256 z) { z = x.mul(y).div(BASE); } function rdiv(uint256 x, uint256 y) internal pure returns (uint256 z) { z = x.mul(BASE).div(y); } function rdivup(uint256 x, uint256 y) internal pure returns (uint256 z) { z = x.mul(BASE).add(y.sub(1)).div(y); } function tmul( uint256 x, uint256 y, uint256 z ) internal pure returns (uint256 result) { result = x.mul(y).mul(z).div(DOUBLE); } function rpow( uint256 x, uint256 n, uint256 base ) internal pure returns (uint256 z) { assembly { switch x case 0 { switch n case 0 { z := base } default { z := 0 } } default { switch mod(n, 2) case 0 { z := base } default { z := x } let half := div(base, 2) // for rounding. for { n := div(n, 2) } n { n := div(n, 2) } { let xx := mul(x, x) if iszero(eq(div(xx, x), x)) { revert(0, 0) } let xxRound := add(xx, half) if lt(xxRound, xx) { revert(0, 0) } x := div(xxRound, base) if mod(n, 2) { let zx := mul(z, x) if and( iszero(iszero(x)), iszero(eq(div(zx, x), z)) ) { revert(0, 0) } let zxRound := add(zx, half) if lt(zxRound, zx) { revert(0, 0) } z := div(zxRound, base) } } } } } }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "./TokenAdmin.sol"; /** * @title dForce's lending Token ERC20 Contract * @author dForce */ abstract contract TokenERC20 is TokenAdmin { /** * @dev Transfers `_amount` tokens from `_spender` to `_recipient`. * @param _spender The address of the source account. * @param _recipient The address of the destination account. * @param _amount The number of tokens to transfer. */ function _transferTokens( address _spender, address _recipient, uint256 _amount ) internal returns (bool) { require( _spender != _recipient, "_transferTokens: Do not self-transfer!" ); controller.beforeTransfer( address(this), msg.sender, _recipient, _amount ); _transfer(_spender, _recipient, _amount); controller.afterTransfer(address(this), _spender, _recipient, _amount); return true; } //---------------------------------- //********* ERC20 Actions ********** //---------------------------------- /** * @notice Cause iToken is an ERC20 token, so users can `transfer` them, * but this action is only allowed when after transferring tokens, the caller * does not have a shortfall. * @dev Moves `_amount` tokens from caller to `_recipient`. * @param _recipient The address of the destination account. * @param _amount The number of tokens to transfer. */ function transfer(address _recipient, uint256 _amount) public virtual override nonReentrant returns (bool) { return _transferTokens(msg.sender, _recipient, _amount); } /** * @notice Cause iToken is an ERC20 token, so users can `transferFrom` them, * but this action is only allowed when after transferring tokens, the `_spender` * does not have a shortfall. * @dev Moves `_amount` tokens from `_spender` to `_recipient`. * @param _spender The address of the source account. * @param _recipient The address of the destination account. * @param _amount The number of tokens to transfer. */ function transferFrom( address _spender, address _recipient, uint256 _amount ) public virtual override nonReentrant returns (bool) { _approve( _spender, msg.sender, allowance[_spender][msg.sender].sub(_amount) ); return _transferTokens(_spender, _recipient, _amount); } }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "./TokenEvent.sol"; /** * @title dForce's lending Token admin Contract * @author dForce */ abstract contract TokenAdmin is TokenEvent { //---------------------------------- //********* Owner Actions ********** //---------------------------------- modifier settleInterest() { // Accrues interest. _updateInterest(); require( accrualBlockNumber == block.number, "settleInterest: Fail to accrue interest!" ); _; } /** * @dev Sets a new controller. */ function _setController(IControllerInterface _newController) external virtual onlyOwner { IControllerInterface _oldController = controller; // Ensures the input address is a controller contract. require( _newController.isController(), "_setController: This is not the controller contract!" ); // Sets to new controller. controller = _newController; emit NewController(_oldController, _newController); } /** * @dev Sets a new interest rate model. * @param _newInterestRateModel The new interest rate model. */ function _setInterestRateModel( IInterestRateModelInterface _newInterestRateModel ) external virtual onlyOwner settleInterest { // Gets current interest rate model. IInterestRateModelInterface _oldInterestRateModel = interestRateModel; // Ensures the input address is the interest model contract. require( _newInterestRateModel.isInterestRateModel(), "_setInterestRateModel: This is not the rate model contract!" ); // Set to the new interest rate model. interestRateModel = _newInterestRateModel; emit NewInterestRateModel(_oldInterestRateModel, _newInterestRateModel); } /** * @dev Sets a new reserve ratio. */ function _setNewReserveRatio(uint256 _newReserveRatio) external virtual onlyOwner settleInterest { require( _newReserveRatio <= maxReserveRatio, "_setNewReserveRatio: New reserve ratio too large!" ); // Gets current reserve ratio. uint256 _oldReserveRatio = reserveRatio; // Sets new reserve ratio. reserveRatio = _newReserveRatio; emit NewReserveRatio(_oldReserveRatio, _newReserveRatio); } /** * @dev Sets a new flashloan fee ratio. */ function _setNewFlashloanFeeRatio(uint256 _newFlashloanFeeRatio) external virtual onlyOwner settleInterest { require( _newFlashloanFeeRatio <= BASE, "setNewFlashloanFeeRatio: New flashloan ratio too large!" ); // Gets current reserve ratio. uint256 _oldFlashloanFeeRatio = flashloanFeeRatio; // Sets new reserve ratio. flashloanFeeRatio = _newFlashloanFeeRatio; emit NewFlashloanFeeRatio(_oldFlashloanFeeRatio, _newFlashloanFeeRatio); } /** * @dev Sets a new protocol fee ratio. */ function _setNewProtocolFeeRatio(uint256 _newProtocolFeeRatio) external virtual onlyOwner settleInterest // nonReentrant { require( _newProtocolFeeRatio <= BASE, "_setNewProtocolFeeRatio: New protocol ratio too large!" ); // Gets current reserve ratio. uint256 _oldProtocolFeeRatio = protocolFeeRatio; // Sets new reserve ratio. protocolFeeRatio = _newProtocolFeeRatio; emit NewProtocolFeeRatio(_oldProtocolFeeRatio, _newProtocolFeeRatio); } /** * @dev Admin withdraws `_withdrawAmount` of the iToken. * @param _withdrawAmount Amount of reserves to withdraw. */ function _withdrawReserves(uint256 _withdrawAmount) external virtual onlyOwner settleInterest // nonReentrant { require( _withdrawAmount <= totalReserves && _withdrawAmount <= _getCurrentCash(), "_withdrawReserves: Invalid withdraw amount and do not have enough cash!" ); uint256 _oldTotalReserves = totalReserves; // Updates total amount of the reserves. totalReserves = totalReserves.sub(_withdrawAmount); // Transfers reserve to the owner. _doTransferOut(owner, _withdrawAmount); emit ReservesWithdrawn( owner, _withdrawAmount, totalReserves, _oldTotalReserves ); } /** * @notice Calculates interest and update total borrows and reserves. * @dev Updates total borrows and reserves with any accumulated interest. */ function _updateInterest() internal virtual; /** * @dev Transfers underlying token out. */ function _doTransferOut(address payable _recipient, uint256 _amount) internal virtual; /** * @dev Total amount of reserves owned by this contract. */ function _getCurrentCash() internal view virtual returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "./TokenStorage.sol"; /** * @title dForce's lending Token event Contract * @author dForce */ contract TokenEvent is TokenStorage { //---------------------------------- //********** User Events *********** //---------------------------------- event UpdateInterest( uint256 currentBlockNumber, uint256 interestAccumulated, uint256 borrowIndex, uint256 cash, uint256 totalBorrows, uint256 totalReserves ); event Mint( address spender, address recipient, uint256 mintAmount, uint256 mintTokens ); event Redeem( address from, address recipient, uint256 redeemiTokenAmount, uint256 redeemUnderlyingAmount ); /** * @dev Emits when underlying is borrowed. */ event Borrow( address borrower, uint256 borrowAmount, uint256 accountBorrows, uint256 accountInterestIndex, uint256 totalBorrows ); event RepayBorrow( address payer, address borrower, uint256 repayAmount, uint256 accountBorrows, uint256 accountInterestIndex, uint256 totalBorrows ); event LiquidateBorrow( address liquidator, address borrower, uint256 repayAmount, address iTokenCollateral, uint256 seizeTokens ); event Flashloan( address loaner, uint256 loanAmount, uint256 flashloanFee, uint256 protocolFee, uint256 timestamp ); //---------------------------------- //********** Owner Events ********** //---------------------------------- event NewReserveRatio(uint256 oldReserveRatio, uint256 newReserveRatio); event NewFlashloanFeeRatio( uint256 oldFlashloanFeeRatio, uint256 newFlashloanFeeRatio ); event NewProtocolFeeRatio( uint256 oldProtocolFeeRatio, uint256 newProtocolFeeRatio ); event NewFlashloanFee( uint256 oldFlashloanFeeRatio, uint256 newFlashloanFeeRatio, uint256 oldProtocolFeeRatio, uint256 newProtocolFeeRatio ); event NewInterestRateModel( IInterestRateModelInterface oldInterestRateModel, IInterestRateModelInterface newInterestRateModel ); event NewController( IControllerInterface oldController, IControllerInterface newController ); event ReservesWithdrawn( address admin, uint256 amount, uint256 newTotalReserves, uint256 oldTotalReserves ); }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol"; import "../library/Initializable.sol"; import "../library/ReentrancyGuard.sol"; import "../library/Ownable.sol"; import "../library/ERC20.sol"; import "../interface/IInterestRateModelInterface.sol"; import "../interface/IControllerInterface.sol"; /** * @title dForce's lending Token storage Contract * @author dForce */ contract TokenStorage is Initializable, ReentrancyGuard, Ownable, ERC20 { //---------------------------------- //********* Token Storage ********** //---------------------------------- uint256 constant BASE = 1e18; /** * @dev Whether this token is supported in the market or not. */ bool public constant isSupported = true; /** * @dev Maximum borrow rate(0.1% per block, scaled by 1e18). */ uint256 constant maxBorrowRate = 0.001e18; /** * @dev Interest ratio set aside for reserves(scaled by 1e18). */ uint256 public reserveRatio; /** * @dev Maximum interest ratio that can be set aside for reserves(scaled by 1e18). */ uint256 constant maxReserveRatio = 1e18; /** * @notice This ratio is relative to the total flashloan fee. * @dev Flash loan fee rate(scaled by 1e18). */ uint256 public flashloanFeeRatio; /** * @notice This ratio is relative to the total flashloan fee. * @dev Protocol fee rate when a flashloan happens(scaled by 1e18); */ uint256 public protocolFeeRatio; /** * @dev Underlying token address. */ IERC20Upgradeable public underlying; /** * @dev Current interest rate model contract. */ IInterestRateModelInterface public interestRateModel; /** * @dev Core control of the contract. */ IControllerInterface public controller; /** * @dev Initial exchange rate(scaled by 1e18). */ uint256 constant initialExchangeRate = 1e18; /** * @dev The interest index for borrows of asset as of blockNumber. */ uint256 public borrowIndex; /** * @dev Block number that interest was last accrued at. */ uint256 public accrualBlockNumber; /** * @dev Total amount of this reserve borrowed. */ uint256 public totalBorrows; /** * @dev Total amount of this reserves accrued. */ uint256 public totalReserves; /** * @dev Container for user balance information written to storage. * @param principal User total balance with accrued interest after applying the user's most recent balance-changing action. * @param interestIndex The total interestIndex as calculated after applying the user's most recent balance-changing action. */ struct BorrowSnapshot { uint256 principal; uint256 interestIndex; } /** * @dev 2-level map: userAddress -> assetAddress -> balance for borrows. */ mapping(address => BorrowSnapshot) internal accountBorrows; bytes32 public DOMAIN_SEPARATOR; // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; mapping(address => uint256) public nonces; }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; /** * @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 Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { require( !_initialized, "Initializable: contract is already initialized" ); _; _initialized = true; } }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; /** * @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]. */ // abstract contract ReentrancyGuardUpgradeable is Initializable { abstract 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; function __ReentrancyGuard_init() 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; } uint256[49] private __gap; }
//SPDX-License-Identifier: MIT pragma solidity 0.6.12; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {_setPendingOwner} and {_acceptOwner}. */ contract Ownable { /** * @dev Returns the address of the current owner. */ address payable public owner; /** * @dev Returns the address of the current pending owner. */ address payable public pendingOwner; event NewOwner(address indexed previousOwner, address indexed newOwner); event NewPendingOwner( address indexed oldPendingOwner, address indexed newPendingOwner ); /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner == msg.sender, "onlyOwner: caller is not the owner"); _; } /** * @dev Initializes the contract setting the deployer as the initial owner. */ function __Ownable_init() internal { owner = msg.sender; emit NewOwner(address(0), msg.sender); } /** * @notice Base on the inputing parameter `newPendingOwner` to check the exact error reason. * @dev Transfer contract control to a new owner. The newPendingOwner must call `_acceptOwner` to finish the transfer. * @param newPendingOwner New pending owner. */ function _setPendingOwner(address payable newPendingOwner) external onlyOwner { require( newPendingOwner != address(0) && newPendingOwner != pendingOwner, "_setPendingOwner: New owenr can not be zero address and owner has been set!" ); // Gets current owner. address oldPendingOwner = pendingOwner; // Sets new pending owner. pendingOwner = newPendingOwner; emit NewPendingOwner(oldPendingOwner, newPendingOwner); } /** * @dev Accepts the admin rights, but only for pendingOwenr. */ function _acceptOwner() external { require( msg.sender == pendingOwner, "_acceptOwner: Only for pending owner!" ); // Gets current values for events. address oldOwner = owner; address oldPendingOwner = pendingOwner; // Set the new contract owner. owner = pendingOwner; // Clear the pendingOwner. pendingOwner = address(0); emit NewOwner(oldOwner, owner); emit NewPendingOwner(oldPendingOwner, pendingOwner); } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity 0.6.12; import "@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.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 { using SafeMathUpgradeable for uint256; mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) public allowance; uint256 public totalSupply; string public name; string public symbol; uint8 public decimals; /** * @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 ); /** * @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. */ function __ERC20_init( string memory name_, string memory symbol_, uint8 decimals_ ) internal { name = name_; symbol = symbol_; decimals = decimals_; } /** * @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 returns (bool) { _transfer(msg.sender, recipient, amount); return true; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual returns (bool) { _approve(msg.sender, 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 returns (bool) { _transfer(sender, recipient, amount); _approve(sender, msg.sender, allowance[sender][msg.sender].sub(amount)); 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( msg.sender, spender, allowance[msg.sender][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( msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue) ); 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"); balanceOf[sender] = balanceOf[sender].sub(amount); balanceOf[recipient] = balanceOf[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"); totalSupply = totalSupply.add(amount); balanceOf[account] = balanceOf[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"); balanceOf[account] = balanceOf[account].sub(amount); 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"); allowance[owner][spender] = amount; emit Approval(owner, spender, amount); } uint256[50] private __gap; }
//SPDX-License-Identifier: MIT pragma solidity 0.6.12; /** * @title dForce Lending Protocol's InterestRateModel Interface. * @author dForce Team. */ interface IInterestRateModelInterface { function isInterestRateModel() external view returns (bool); /** * @dev Calculates the current borrow interest rate per block. * @param cash The total amount of cash the market has. * @param borrows The total amount of borrows the market has. * @param reserves The total amnount of reserves the market has. * @return The borrow rate per block (as a percentage, and scaled by 1e18). */ function getBorrowRate( uint256 cash, uint256 borrows, uint256 reserves ) external view returns (uint256); /** * @dev Calculates the current supply interest rate per block. * @param cash The total amount of cash the market has. * @param borrows The total amount of borrows the market has. * @param reserves The total amnount of reserves the market has. * @param reserveRatio The current reserve factor the market has. * @return The supply rate per block (as a percentage, and scaled by 1e18). */ function getSupplyRate( uint256 cash, uint256 borrows, uint256 reserves, uint256 reserveRatio ) external view returns (uint256); }
//SPDX-License-Identifier: MIT pragma solidity 0.6.12; interface IControllerAdminInterface { /// @notice Emitted when an admin supports a market event MarketAdded( address iToken, uint256 collateralFactor, uint256 borrowFactor, uint256 supplyCapacity, uint256 borrowCapacity, uint256 distributionFactor ); function _addMarket( address _iToken, uint256 _collateralFactor, uint256 _borrowFactor, uint256 _supplyCapacity, uint256 _borrowCapacity, uint256 _distributionFactor ) external; /// @notice Emitted when new price oracle is set event NewPriceOracle(address oldPriceOracle, address newPriceOracle); function _setPriceOracle(address newOracle) external; /// @notice Emitted when close factor is changed by admin event NewCloseFactor( uint256 oldCloseFactorMantissa, uint256 newCloseFactorMantissa ); function _setCloseFactor(uint256 newCloseFactorMantissa) external; /// @notice Emitted when liquidation incentive is changed by admin event NewLiquidationIncentive( uint256 oldLiquidationIncentiveMantissa, uint256 newLiquidationIncentiveMantissa ); function _setLiquidationIncentive(uint256 newLiquidationIncentiveMantissa) external; /// @notice Emitted when iToken's collateral factor is changed by admin event NewCollateralFactor( address iToken, uint256 oldCollateralFactorMantissa, uint256 newCollateralFactorMantissa ); function _setCollateralFactor( address iToken, uint256 newCollateralFactorMantissa ) external; /// @notice Emitted when iToken's borrow factor is changed by admin event NewBorrowFactor( address iToken, uint256 oldBorrowFactorMantissa, uint256 newBorrowFactorMantissa ); function _setBorrowFactor(address iToken, uint256 newBorrowFactorMantissa) external; /// @notice Emitted when iToken's borrow capacity is changed by admin event NewBorrowCapacity( address iToken, uint256 oldBorrowCapacity, uint256 newBorrowCapacity ); function _setBorrowCapacity(address iToken, uint256 newBorrowCapacity) external; /// @notice Emitted when iToken's supply capacity is changed by admin event NewSupplyCapacity( address iToken, uint256 oldSupplyCapacity, uint256 newSupplyCapacity ); function _setSupplyCapacity(address iToken, uint256 newSupplyCapacity) external; /// @notice Emitted when pause guardian is changed by admin event NewPauseGuardian(address oldPauseGuardian, address newPauseGuardian); function _setPauseGuardian(address newPauseGuardian) external; /// @notice Emitted when mint is paused/unpaused by admin or pause guardian event MintPaused(address iToken, bool paused); function _setMintPaused(address iToken, bool paused) external; function _setAllMintPaused(bool paused) external; /// @notice Emitted when redeem is paused/unpaused by admin or pause guardian event RedeemPaused(address iToken, bool paused); function _setRedeemPaused(address iToken, bool paused) external; function _setAllRedeemPaused(bool paused) external; /// @notice Emitted when borrow is paused/unpaused by admin or pause guardian event BorrowPaused(address iToken, bool paused); function _setBorrowPaused(address iToken, bool paused) external; function _setAllBorrowPaused(bool paused) external; /// @notice Emitted when transfer is paused/unpaused by admin or pause guardian event TransferPaused(bool paused); function _setTransferPaused(bool paused) external; /// @notice Emitted when seize is paused/unpaused by admin or pause guardian event SeizePaused(bool paused); function _setSeizePaused(bool paused) external; function _setiTokenPaused(address iToken, bool paused) external; function _setProtocolPaused(bool paused) external; event NewRewardDistributor( address oldRewardDistributor, address _newRewardDistributor ); function _setRewardDistributor(address _newRewardDistributor) external; } interface IControllerPolicyInterface { function beforeMint( address iToken, address account, uint256 mintAmount ) external; function afterMint( address iToken, address minter, uint256 mintAmount, uint256 mintedAmount ) external; function beforeRedeem( address iToken, address redeemer, uint256 redeemAmount ) external; function afterRedeem( address iToken, address redeemer, uint256 redeemAmount, uint256 redeemedAmount ) external; function beforeBorrow( address iToken, address borrower, uint256 borrowAmount ) external; function afterBorrow( address iToken, address borrower, uint256 borrowedAmount ) external; function beforeRepayBorrow( address iToken, address payer, address borrower, uint256 repayAmount ) external; function afterRepayBorrow( address iToken, address payer, address borrower, uint256 repayAmount ) external; function beforeLiquidateBorrow( address iTokenBorrowed, address iTokenCollateral, address liquidator, address borrower, uint256 repayAmount ) external; function afterLiquidateBorrow( address iTokenBorrowed, address iTokenCollateral, address liquidator, address borrower, uint256 repaidAmount, uint256 seizedAmount ) external; function beforeSeize( address iTokenBorrowed, address iTokenCollateral, address liquidator, address borrower, uint256 seizeAmount ) external; function afterSeize( address iTokenBorrowed, address iTokenCollateral, address liquidator, address borrower, uint256 seizedAmount ) external; function beforeTransfer( address iToken, address from, address to, uint256 amount ) external; function afterTransfer( address iToken, address from, address to, uint256 amount ) external; function beforeFlashloan( address iToken, address to, uint256 amount ) external; function afterFlashloan( address iToken, address to, uint256 amount ) external; } interface IControllerAccountEquityInterface { function calcAccountEquity(address account) external view returns ( uint256, uint256, uint256, uint256 ); function liquidateCalculateSeizeTokens( address iTokenBorrowed, address iTokenCollateral, uint256 actualRepayAmount ) external view returns (uint256); } interface IControllerAccountInterface { function hasEnteredMarket(address account, address iToken) external view returns (bool); function getEnteredMarkets(address account) external view returns (address[] memory); /// @notice Emitted when an account enters a market event MarketEntered(address iToken, address account); function enterMarkets(address[] calldata iTokens) external returns (bool[] memory); /// @notice Emitted when an account exits a market event MarketExited(address iToken, address account); function exitMarkets(address[] calldata iTokens) external returns (bool[] memory); /// @notice Emitted when an account add a borrow asset event BorrowedAdded(address iToken, address account); /// @notice Emitted when an account remove a borrow asset event BorrowedRemoved(address iToken, address account); function hasBorrowed(address account, address iToken) external view returns (bool); function getBorrowedAssets(address account) external view returns (address[] memory); } interface IControllerInterface is IControllerAdminInterface, IControllerPolicyInterface, IControllerAccountEquityInterface, IControllerAccountInterface { /** * @notice Security checks when updating the comptroller of a market, always expect to return true. */ function isController() external view returns (bool); /** * @notice Return all of the iTokens * @return The list of iToken addresses */ function getAlliTokens() external view returns (address[] memory); /** * @notice Check whether a iToken is listed in controller * @param _iToken The iToken to check for * @return true if the iToken is listed otherwise false */ function hasiToken(address _iToken) external view returns (bool); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
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Contract Creation Code
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Multichain Portfolio | 26 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.