ERC-20
Overview
Max Total Supply
47.384657248822111907 fcrvUSD(yvCurve-FRAX-crvUSD-f)-3
Holders
2
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
47.38406276560939534 fcrvUSD(yvCurve-FRAX-crvUSD-f)-3Value
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x7578F31C...f9C990091 The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
SturdyPair
Compiler Version
v0.8.21+commit.d9974bed
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; // ========================== SturdyPair ============================ import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol"; import { SturdyPairCore } from "./SturdyPairCore.sol"; import { SafeERC20 } from "./libraries/SafeERC20.sol"; import { VaultAccount, VaultAccountingLibrary } from "./libraries/VaultAccount.sol"; import { IRateCalculatorV2 } from "./interfaces/IRateCalculatorV2.sol"; /// @title SturdyPair /// @author Drake Evans (Frax Finance) https://github.com/drakeevans /// @notice The SturdyPair is a lending pair that allows users to engage in lending and borrowing activities contract SturdyPair is IERC20Metadata, SturdyPairCore { using VaultAccountingLibrary for VaultAccount; using SafeERC20 for IERC20; using SafeCast for uint256; /// @param _configData abi.encode(address _asset, address _collateral, address _oracle, uint32 _maxOracleDeviation, address _rateContract, uint64 _fullUtilizationRate, uint256 _maxLTV, uint256 _cleanLiquidationFee, uint256 _dirtyLiquidationFee, uint256 _protocolLiquidationFee) /// @param _immutables abi.encode(address _circuitBreakerAddress, address _comptrollerAddress, address _timelockAddress) /// @param _customConfigData abi.encode(string memory _nameOfContract, string memory _symbolOfContract, uint8 _decimalsOfContract) constructor( bytes memory _configData, bytes memory _immutables, bytes memory _customConfigData ) SturdyPairCore(_configData, _immutables, _customConfigData) {} // ============================================================================================ // ERC20 Metadata // ============================================================================================ function name() public view override(ERC20, IERC20Metadata) returns (string memory) { return nameOfContract; } function symbol() public view override(ERC20, IERC20Metadata) returns (string memory) { return symbolOfContract; } function decimals() public view override(ERC20, IERC20Metadata) returns (uint8) { return decimalsOfContract; } // totalSupply for fToken ERC20 compatibility function totalSupply() public view override(ERC20, IERC20) returns (uint256) { return totalAsset.shares; } // ============================================================================================ // Functions: Helpers // ============================================================================================ function asset() external view returns (address) { return address(assetContract); } function getConstants() external pure returns ( uint256 _LTV_PRECISION, uint256 _LIQ_PRECISION, uint256 _UTIL_PREC, uint256 _FEE_PRECISION, uint256 _EXCHANGE_PRECISION, uint256 _DEVIATION_PRECISION, uint256 _RATE_PRECISION, uint256 _MAX_PROTOCOL_FEE ) { _LTV_PRECISION = LTV_PRECISION; _LIQ_PRECISION = LIQ_PRECISION; _UTIL_PREC = UTIL_PREC; _FEE_PRECISION = FEE_PRECISION; _EXCHANGE_PRECISION = EXCHANGE_PRECISION; _DEVIATION_PRECISION = DEVIATION_PRECISION; _RATE_PRECISION = RATE_PRECISION; _MAX_PROTOCOL_FEE = MAX_PROTOCOL_FEE; } /// @notice The ```getUserSnapshot``` function gets user level accounting data /// @param _address The user address /// @return _userAssetShares The user fToken balance /// @return _userBorrowShares The user borrow shares /// @return _userCollateralBalance The user collateral balance function getUserSnapshot( address _address ) external view returns (uint256 _userAssetShares, uint256 _userBorrowShares, uint256 _userCollateralBalance) { _userAssetShares = balanceOf(_address); _userBorrowShares = userBorrowShares[_address]; _userCollateralBalance = userCollateralBalance[_address]; } /// @notice The ```getPairAccounting``` function gets all pair level accounting numbers /// @return _totalAssetAmount Total assets deposited and interest accrued, total claims /// @return _totalAssetShares Total fTokens /// @return _totalBorrowAmount Total borrows /// @return _totalBorrowShares Total borrow shares /// @return _totalCollateral Total collateral function getPairAccounting() external view returns ( uint128 _totalAssetAmount, uint128 _totalAssetShares, uint128 _totalBorrowAmount, uint128 _totalBorrowShares, uint256 _totalCollateral ) { (, , , , VaultAccount memory _totalAsset, VaultAccount memory _totalBorrow) = previewAddInterest(); _totalAssetAmount = _totalAsset.amount; _totalAssetShares = _totalAsset.shares; _totalBorrowAmount = _totalBorrow.amount; _totalBorrowShares = _totalBorrow.shares; _totalCollateral = totalCollateral; } /// @notice The ```toBorrowShares``` function converts a given amount of borrow debt into the number of shares /// @param _amount Amount of borrow /// @param _roundUp Whether to roundup during division /// @param _previewInterest Whether to simulate interest accrual /// @return _shares The number of shares function toBorrowShares( uint256 _amount, bool _roundUp, bool _previewInterest ) external view returns (uint256 _shares) { if (_previewInterest) { (, , , , , VaultAccount memory _totalBorrow) = previewAddInterest(); _shares = _totalBorrow.toShares(_amount, _roundUp); } else { _shares = totalBorrow.toShares(_amount, _roundUp); } } /// @notice The ```toBorrowAmount``` function converts a given amount of borrow debt into the number of shares /// @param _shares Shares of borrow /// @param _roundUp Whether to roundup during division /// @param _previewInterest Whether to simulate interest accrual /// @return _amount The amount of asset function toBorrowAmount( uint256 _shares, bool _roundUp, bool _previewInterest ) external view returns (uint256 _amount) { if (_previewInterest) { (, , , , , VaultAccount memory _totalBorrow) = previewAddInterest(); _amount = _totalBorrow.toAmount(_shares, _roundUp); } else { _amount = totalBorrow.toAmount(_shares, _roundUp); } } /// @notice The ```toAssetAmount``` function converts a given number of shares to an asset amount /// @param _shares Shares of asset (fToken) /// @param _roundUp Whether to round up after division /// @param _previewInterest Whether to preview interest accrual before calculation /// @return _amount The amount of asset function toAssetAmount( uint256 _shares, bool _roundUp, bool _previewInterest ) public view returns (uint256 _amount) { if (_previewInterest) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); _amount = _totalAsset.toAmount(_shares, _roundUp); } else { _amount = totalAsset.toAmount(_shares, _roundUp); } } /// @notice The ```toAssetShares``` function converts a given asset amount to a number of asset shares (fTokens) /// @param _amount The amount of asset /// @param _roundUp Whether to round up after division /// @param _previewInterest Whether to preview interest accrual before calculation /// @return _shares The number of shares (fTokens) function toAssetShares( uint256 _amount, bool _roundUp, bool _previewInterest ) public view returns (uint256 _shares) { if (_previewInterest) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); _shares = _totalAsset.toShares(_amount, _roundUp); } else { _shares = totalAsset.toShares(_amount, _roundUp); } } function convertToAssets(uint256 _shares) external view returns (uint256 _assets) { _assets = toAssetAmount(_shares, false, true); } function convertToShares(uint256 _assets) external view returns (uint256 _shares) { _shares = toAssetShares(_assets, false, true); } function pricePerShare() external view returns (uint256 _amount) { _amount = toAssetAmount(1e18, false, true); } function totalAssets() external view returns (uint256) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); return _totalAsset.amount; } function maxDeposit(address _receiver) public view returns (uint256 _maxAssets) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); _maxAssets = _totalAsset.amount >= depositLimit ? 0 : depositLimit - _totalAsset.amount; } function maxMint(address _receiver) external view returns (uint256 _maxShares) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); uint256 _maxDeposit = _totalAsset.amount >= depositLimit ? 0 : depositLimit - _totalAsset.amount; _maxShares = _totalAsset.toShares(_maxDeposit, false); } function maxWithdraw(address _owner) external view returns (uint256 _maxAssets) { if (isWithdrawPaused) return 0; ( , , uint256 _feesShare, , VaultAccount memory _totalAsset, VaultAccount memory _totalBorrow ) = previewAddInterest(); // Get the owner balance and include the fees share if owner is this contract uint256 _ownerBalance = _owner == address(this) ? balanceOf(_owner) + _feesShare : balanceOf(_owner); // Return the lower of total assets in contract or total assets available to _owner uint256 _totalAssetsAvailable = _totalAssetAvailable(_totalAsset, _totalBorrow); uint256 _totalUserWithdraw = _totalAsset.toAmount(_ownerBalance, false); _maxAssets = _totalAssetsAvailable < _totalUserWithdraw ? _totalAssetsAvailable : _totalUserWithdraw; } function maxRedeem(address _owner) external view returns (uint256 _maxShares) { if (isWithdrawPaused) return 0; ( , , uint256 _feesShare, , VaultAccount memory _totalAsset, VaultAccount memory _totalBorrow ) = previewAddInterest(); // Calculate the total shares available uint256 _totalAssetsAvailable = _totalAssetAvailable(_totalAsset, _totalBorrow); uint256 _totalSharesAvailable = _totalAsset.toShares(_totalAssetsAvailable, false); // Get the owner balance and include the fees share if owner is this contract uint256 _ownerBalance = _owner == address(this) ? balanceOf(_owner) + _feesShare : balanceOf(_owner); _maxShares = _totalSharesAvailable < _ownerBalance ? _totalSharesAvailable : _ownerBalance; } // ============================================================================================ // Functions: Configuration // ============================================================================================ /// @notice The ```SetOracleInfo``` event is emitted when the oracle info (address and max deviation) is set /// @param oldOracle The old oracle address /// @param oldMaxOracleDeviation The old max oracle deviation /// @param newOracle The new oracle address /// @param newMaxOracleDeviation The new max oracle deviation event SetOracleInfo( address oldOracle, uint32 oldMaxOracleDeviation, address newOracle, uint32 newMaxOracleDeviation ); /// @notice The ```setOracleInfo``` function sets the oracle data /// @param _newOracle The new oracle address /// @param _newMaxOracleDeviation The new max oracle deviation function setOracle(address _newOracle, uint32 _newMaxOracleDeviation) external { _requireTimelock(); ExchangeRateInfo memory _exchangeRateInfo = exchangeRateInfo; emit SetOracleInfo( _exchangeRateInfo.oracle, _exchangeRateInfo.maxOracleDeviation, _newOracle, _newMaxOracleDeviation ); _exchangeRateInfo.oracle = _newOracle; _exchangeRateInfo.maxOracleDeviation = _newMaxOracleDeviation; exchangeRateInfo = _exchangeRateInfo; } bool public isMaxLTVSetterRevoked; /// @notice The ```RevokeMaxLTVSetter``` event is emitted when the max LTV setter is revoked event RevokeMaxLTVSetter(); /// @notice The ```revokeMaxLTVSetter``` function revokes the max LTV setter function revokeMaxLTVSetter() external { _requireTimelock(); isMaxLTVSetterRevoked = true; emit RevokeMaxLTVSetter(); } /// @notice The ```SetMaxLTV``` event is emitted when the max LTV is set /// @param oldMaxLTV The old max LTV /// @param newMaxLTV The new max LTV event SetMaxLTV(uint256 oldMaxLTV, uint256 newMaxLTV); /// @notice The ```setMaxLTV``` function sets the max LTV /// @param _newMaxLTV The new max LTV function setMaxLTV(uint256 _newMaxLTV) external { _requireTimelock(); if (isMaxLTVSetterRevoked) revert SetterRevoked(); emit SetMaxLTV(maxLTV, _newMaxLTV); maxLTV = _newMaxLTV; } /// @notice The ```SetRateContract``` event is emitted when the rate contract is set /// @param oldRateContract The old rate contract /// @param newRateContract The new rate contract event SetRateContract(address oldRateContract, address newRateContract); /// @notice The ```setRateContract``` function sets the rate contract address /// @param _newRateContract The new rate contract address function setRateContract(address _newRateContract) external { _requireTimelock(); emit SetRateContract(address(rateContract), _newRateContract); rateContract = IRateCalculatorV2(_newRateContract); } /// @notice The ```SetLiquidationFees``` event is emitted when the liquidation fees are set /// @param oldCleanLiquidationFee The old clean liquidation fee /// @param oldDirtyLiquidationFee The old dirty liquidation fee /// @param oldProtocolLiquidationFee The old protocol liquidation fee /// @param newCleanLiquidationFee The new clean liquidation fee /// @param newDirtyLiquidationFee The new dirty liquidation fee /// @param newProtocolLiquidationFee The new protocol liquidation fee event SetLiquidationFees( uint256 oldCleanLiquidationFee, uint256 oldDirtyLiquidationFee, uint256 oldProtocolLiquidationFee, uint256 newCleanLiquidationFee, uint256 newDirtyLiquidationFee, uint256 newProtocolLiquidationFee ); /// @notice The ```setLiquidationFees``` function sets the liquidation fees /// @param _newCleanLiquidationFee The new clean liquidation fee /// @param _newDirtyLiquidationFee The new dirty liquidation fee function setLiquidationFees( uint256 _newCleanLiquidationFee, uint256 _newDirtyLiquidationFee, uint256 _newProtocolLiquidationFee ) external { _requireTimelock(); emit SetLiquidationFees( cleanLiquidationFee, dirtyLiquidationFee, protocolLiquidationFee, _newCleanLiquidationFee, _newDirtyLiquidationFee, _newProtocolLiquidationFee ); cleanLiquidationFee = _newCleanLiquidationFee; dirtyLiquidationFee = _newDirtyLiquidationFee; protocolLiquidationFee = _newProtocolLiquidationFee; } /// @notice The ```ChangeFee``` event first when the fee is changed /// @param newFee The new fee event ChangeFee(uint32 newFee); /// @notice The ```changeFee``` function changes the protocol fee, max 50% /// @param _newFee The new fee function changeFee(uint32 _newFee) external { _requireTimelock(); if (isInterestPaused) revert InterestPaused(); if (_newFee > MAX_PROTOCOL_FEE) { revert BadProtocolFee(); } _addInterest(); currentRateInfo.feeToProtocolRate = _newFee; emit ChangeFee(_newFee); } /// @notice The ```WithdrawFees``` event fires when the fees are withdrawn /// @param shares Number of shares (fTokens) redeemed /// @param recipient To whom the assets were sent /// @param amountToTransfer The amount of fees redeemed event WithdrawFees(uint128 shares, address recipient, uint256 amountToTransfer, uint256 collateralAmount); /// @notice The ```withdrawFees``` function withdraws fees accumulated /// @param _shares Number of fTokens to redeem /// @param _recipient Address to send the assets /// @return _amountToTransfer Amount of assets sent to recipient function withdrawFees(uint128 _shares, address _recipient) external onlyOwner returns (uint256 _amountToTransfer) { if (_recipient == address(0)) revert InvalidReceiver(); // Grab some data from state to save gas VaultAccount memory _totalAsset = totalAsset; // Take all available if 0 value passed if (_shares == 0) _shares = uint128(balanceOf(address(this))); // We must calculate this before we subtract from _totalAsset or invoke _burn _amountToTransfer = _totalAsset.toAmount(_shares, true); _approve(address(this), msg.sender, _shares); _redeem(_totalAsset, _amountToTransfer.toUint128(), _shares, _recipient, address(this)); uint256 _collateralAmount = userCollateralBalance[address(this)]; _removeCollateral(_collateralAmount, _recipient, address(this)); emit WithdrawFees(_shares, _recipient, _amountToTransfer, _collateralAmount); } /// @notice The ```SetSwapper``` event fires whenever a swapper is black or whitelisted /// @param swapper The swapper address /// @param approval The approval event SetSwapper(address swapper, bool approval); /// @notice The ```setSwapper``` function is called to black or whitelist a given swapper address /// @dev /// @param _swapper The swapper address /// @param _approval The approval function setSwapper(address _swapper, bool _approval) external onlyOwner { swappers[_swapper] = _approval; emit SetSwapper(_swapper, _approval); } // ============================================================================================ // Functions: Access Control // ============================================================================================ /// @notice The ```pause``` function is called to pause all contract functionality function pause() external { _requireProtocolOrOwner(); _setBorrowLimit(0); _setDepositLimit(0); if (!isRepayAccessControlRevoked) _pauseRepay(true); if (!isWithdrawAccessControlRevoked) _pauseWithdraw(true); if (!isLiquidateAccessControlRevoked) _pauseLiquidate(true); _addInterest(); _pauseInterest(true); } /// @notice The ```unpause``` function is called to unpause all contract functionality function unpause() external { _requireTimelockOrOwner(); _setBorrowLimit(type(uint256).max); _setDepositLimit(type(uint256).max); if (!isRepayAccessControlRevoked) _pauseRepay(false); if (!isWithdrawAccessControlRevoked) _pauseWithdraw(false); if (!isLiquidateAccessControlRevoked) _pauseLiquidate(false); _addInterest(); _pauseInterest(false); } /// @notice The ```pauseBorrow``` function sets borrow limit to 0 function pauseBorrow() external { _requireProtocolOrOwner(); _setBorrowLimit(0); } /// @notice The ```setBorrowLimit``` function sets the borrow limit /// @param _limit The new borrow limit function setBorrowLimit(uint256 _limit) external { _requireTimelockOrOwner(); _setBorrowLimit(_limit); } /// @notice The ```pauseDeposit``` function pauses deposit functionality function pauseDeposit() external { _requireProtocolOrOwner(); _setDepositLimit(0); } /// @notice The ```setDepositLimit``` function sets the deposit limit /// @param _limit The new deposit limit function setDepositLimit(uint256 _limit) external { _requireTimelockOrOwner(); _setDepositLimit(_limit); } /// @notice The ```pauseRepay``` function pauses repay functionality /// @param _isPaused The new pause state function pauseRepay(bool _isPaused) external { if (_isPaused) { _requireProtocolOrOwner(); } else { _requireTimelockOrOwner(); } if (isRepayAccessControlRevoked) revert AccessControlRevoked(); _pauseRepay(_isPaused); } /// @notice The ```revokeRepayAccessControl``` function revokes repay access control function revokeRepayAccessControl() external { _requireTimelock(); _revokeRepayAccessControl(); } /// @notice The ```pauseWithdraw``` function pauses withdraw functionality /// @param _isPaused The new pause state function pauseWithdraw(bool _isPaused) external { if (_isPaused) { _requireProtocolOrOwner(); } else { _requireTimelockOrOwner(); } if (isWithdrawAccessControlRevoked) revert AccessControlRevoked(); _pauseWithdraw(_isPaused); } /// @notice The ```revokeWithdrawAccessControl``` function revokes withdraw access control function revokeWithdrawAccessControl() external { _requireTimelock(); _revokeWithdrawAccessControl(); } /// @notice The ```pauseLiquidate``` function pauses liquidate functionality /// @param _isPaused The new pause state function pauseLiquidate(bool _isPaused) external { if (_isPaused) { _requireProtocolOrOwner(); } else { _requireTimelockOrOwner(); } if (isLiquidateAccessControlRevoked) revert AccessControlRevoked(); _pauseLiquidate(_isPaused); } /// @notice The ```revokeLiquidateAccessControl``` function revokes liquidate access control function revokeLiquidateAccessControl() external { _requireTimelock(); _revokeLiquidateAccessControl(); } /// @notice The ```pauseInterest``` function pauses interest functionality /// @param _isPaused The new pause state function pauseInterest(bool _isPaused) external { if (_isPaused) { _requireProtocolOrOwner(); } else { _requireTimelockOrOwner(); } // Resets the lastTimestamp which has the effect of no interest accruing over the pause period _addInterest(); _pauseInterest(_isPaused); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.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.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * The default value of {decimals} is 18. To change this, you should override * this function so it returns a different value. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead 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, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override 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 default value returned by this function, unless * it's overridden. * * 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 virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, 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}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, 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}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, 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) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + 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) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This 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: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer(address from, address to, uint256 amount) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, 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: * * - `account` 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 += amount; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _balances[account] += amount; } emit Transfer(address(0), account, amount); _afterTokenTransfer(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); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); _afterTokenTransfer(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 Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance(address owner, address spender, uint256 amount) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @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 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 {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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 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 `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SafeCast.sol) // This file was procedurally generated from scripts/generate/templates/SafeCast.js. pragma solidity ^0.8.0; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such 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. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library SafeCast { /** * @dev Returns the downcasted uint248 from uint256, reverting on * overflow (when the input is greater than largest uint248). * * Counterpart to Solidity's `uint248` operator. * * Requirements: * * - input must fit into 248 bits * * _Available since v4.7._ */ function toUint248(uint256 value) internal pure returns (uint248) { require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits"); return uint248(value); } /** * @dev Returns the downcasted uint240 from uint256, reverting on * overflow (when the input is greater than largest uint240). * * Counterpart to Solidity's `uint240` operator. * * Requirements: * * - input must fit into 240 bits * * _Available since v4.7._ */ function toUint240(uint256 value) internal pure returns (uint240) { require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits"); return uint240(value); } /** * @dev Returns the downcasted uint232 from uint256, reverting on * overflow (when the input is greater than largest uint232). * * Counterpart to Solidity's `uint232` operator. * * Requirements: * * - input must fit into 232 bits * * _Available since v4.7._ */ function toUint232(uint256 value) internal pure returns (uint232) { require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits"); return uint232(value); } /** * @dev Returns the downcasted uint224 from uint256, reverting on * overflow (when the input is greater than largest uint224). * * Counterpart to Solidity's `uint224` operator. * * Requirements: * * - input must fit into 224 bits * * _Available since v4.2._ */ function toUint224(uint256 value) internal pure returns (uint224) { require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); return uint224(value); } /** * @dev Returns the downcasted uint216 from uint256, reverting on * overflow (when the input is greater than largest uint216). * * Counterpart to Solidity's `uint216` operator. * * Requirements: * * - input must fit into 216 bits * * _Available since v4.7._ */ function toUint216(uint256 value) internal pure returns (uint216) { require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits"); return uint216(value); } /** * @dev Returns the downcasted uint208 from uint256, reverting on * overflow (when the input is greater than largest uint208). * * Counterpart to Solidity's `uint208` operator. * * Requirements: * * - input must fit into 208 bits * * _Available since v4.7._ */ function toUint208(uint256 value) internal pure returns (uint208) { require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits"); return uint208(value); } /** * @dev Returns the downcasted uint200 from uint256, reverting on * overflow (when the input is greater than largest uint200). * * Counterpart to Solidity's `uint200` operator. * * Requirements: * * - input must fit into 200 bits * * _Available since v4.7._ */ function toUint200(uint256 value) internal pure returns (uint200) { require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits"); return uint200(value); } /** * @dev Returns the downcasted uint192 from uint256, reverting on * overflow (when the input is greater than largest uint192). * * Counterpart to Solidity's `uint192` operator. * * Requirements: * * - input must fit into 192 bits * * _Available since v4.7._ */ function toUint192(uint256 value) internal pure returns (uint192) { require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits"); return uint192(value); } /** * @dev Returns the downcasted uint184 from uint256, reverting on * overflow (when the input is greater than largest uint184). * * Counterpart to Solidity's `uint184` operator. * * Requirements: * * - input must fit into 184 bits * * _Available since v4.7._ */ function toUint184(uint256 value) internal pure returns (uint184) { require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits"); return uint184(value); } /** * @dev Returns the downcasted uint176 from uint256, reverting on * overflow (when the input is greater than largest uint176). * * Counterpart to Solidity's `uint176` operator. * * Requirements: * * - input must fit into 176 bits * * _Available since v4.7._ */ function toUint176(uint256 value) internal pure returns (uint176) { require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits"); return uint176(value); } /** * @dev Returns the downcasted uint168 from uint256, reverting on * overflow (when the input is greater than largest uint168). * * Counterpart to Solidity's `uint168` operator. * * Requirements: * * - input must fit into 168 bits * * _Available since v4.7._ */ function toUint168(uint256 value) internal pure returns (uint168) { require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits"); return uint168(value); } /** * @dev Returns the downcasted uint160 from uint256, reverting on * overflow (when the input is greater than largest uint160). * * Counterpart to Solidity's `uint160` operator. * * Requirements: * * - input must fit into 160 bits * * _Available since v4.7._ */ function toUint160(uint256 value) internal pure returns (uint160) { require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits"); return uint160(value); } /** * @dev Returns the downcasted uint152 from uint256, reverting on * overflow (when the input is greater than largest uint152). * * Counterpart to Solidity's `uint152` operator. * * Requirements: * * - input must fit into 152 bits * * _Available since v4.7._ */ function toUint152(uint256 value) internal pure returns (uint152) { require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits"); return uint152(value); } /** * @dev Returns the downcasted uint144 from uint256, reverting on * overflow (when the input is greater than largest uint144). * * Counterpart to Solidity's `uint144` operator. * * Requirements: * * - input must fit into 144 bits * * _Available since v4.7._ */ function toUint144(uint256 value) internal pure returns (uint144) { require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits"); return uint144(value); } /** * @dev Returns the downcasted uint136 from uint256, reverting on * overflow (when the input is greater than largest uint136). * * Counterpart to Solidity's `uint136` operator. * * Requirements: * * - input must fit into 136 bits * * _Available since v4.7._ */ function toUint136(uint256 value) internal pure returns (uint136) { require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits"); return uint136(value); } /** * @dev Returns the downcasted uint128 from uint256, reverting on * overflow (when the input is greater than largest uint128). * * Counterpart to Solidity's `uint128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v2.5._ */ function toUint128(uint256 value) internal pure returns (uint128) { require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits"); return uint128(value); } /** * @dev Returns the downcasted uint120 from uint256, reverting on * overflow (when the input is greater than largest uint120). * * Counterpart to Solidity's `uint120` operator. * * Requirements: * * - input must fit into 120 bits * * _Available since v4.7._ */ function toUint120(uint256 value) internal pure returns (uint120) { require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits"); return uint120(value); } /** * @dev Returns the downcasted uint112 from uint256, reverting on * overflow (when the input is greater than largest uint112). * * Counterpart to Solidity's `uint112` operator. * * Requirements: * * - input must fit into 112 bits * * _Available since v4.7._ */ function toUint112(uint256 value) internal pure returns (uint112) { require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits"); return uint112(value); } /** * @dev Returns the downcasted uint104 from uint256, reverting on * overflow (when the input is greater than largest uint104). * * Counterpart to Solidity's `uint104` operator. * * Requirements: * * - input must fit into 104 bits * * _Available since v4.7._ */ function toUint104(uint256 value) internal pure returns (uint104) { require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits"); return uint104(value); } /** * @dev Returns the downcasted uint96 from uint256, reverting on * overflow (when the input is greater than largest uint96). * * Counterpart to Solidity's `uint96` operator. * * Requirements: * * - input must fit into 96 bits * * _Available since v4.2._ */ function toUint96(uint256 value) internal pure returns (uint96) { require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits"); return uint96(value); } /** * @dev Returns the downcasted uint88 from uint256, reverting on * overflow (when the input is greater than largest uint88). * * Counterpart to Solidity's `uint88` operator. * * Requirements: * * - input must fit into 88 bits * * _Available since v4.7._ */ function toUint88(uint256 value) internal pure returns (uint88) { require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits"); return uint88(value); } /** * @dev Returns the downcasted uint80 from uint256, reverting on * overflow (when the input is greater than largest uint80). * * Counterpart to Solidity's `uint80` operator. * * Requirements: * * - input must fit into 80 bits * * _Available since v4.7._ */ function toUint80(uint256 value) internal pure returns (uint80) { require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits"); return uint80(value); } /** * @dev Returns the downcasted uint72 from uint256, reverting on * overflow (when the input is greater than largest uint72). * * Counterpart to Solidity's `uint72` operator. * * Requirements: * * - input must fit into 72 bits * * _Available since v4.7._ */ function toUint72(uint256 value) internal pure returns (uint72) { require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits"); return uint72(value); } /** * @dev Returns the downcasted uint64 from uint256, reverting on * overflow (when the input is greater than largest uint64). * * Counterpart to Solidity's `uint64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v2.5._ */ function toUint64(uint256 value) internal pure returns (uint64) { require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits"); return uint64(value); } /** * @dev Returns the downcasted uint56 from uint256, reverting on * overflow (when the input is greater than largest uint56). * * Counterpart to Solidity's `uint56` operator. * * Requirements: * * - input must fit into 56 bits * * _Available since v4.7._ */ function toUint56(uint256 value) internal pure returns (uint56) { require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits"); return uint56(value); } /** * @dev Returns the downcasted uint48 from uint256, reverting on * overflow (when the input is greater than largest uint48). * * Counterpart to Solidity's `uint48` operator. * * Requirements: * * - input must fit into 48 bits * * _Available since v4.7._ */ function toUint48(uint256 value) internal pure returns (uint48) { require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits"); return uint48(value); } /** * @dev Returns the downcasted uint40 from uint256, reverting on * overflow (when the input is greater than largest uint40). * * Counterpart to Solidity's `uint40` operator. * * Requirements: * * - input must fit into 40 bits * * _Available since v4.7._ */ function toUint40(uint256 value) internal pure returns (uint40) { require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits"); return uint40(value); } /** * @dev Returns the downcasted uint32 from uint256, reverting on * overflow (when the input is greater than largest uint32). * * Counterpart to Solidity's `uint32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v2.5._ */ function toUint32(uint256 value) internal pure returns (uint32) { require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits"); return uint32(value); } /** * @dev Returns the downcasted uint24 from uint256, reverting on * overflow (when the input is greater than largest uint24). * * Counterpart to Solidity's `uint24` operator. * * Requirements: * * - input must fit into 24 bits * * _Available since v4.7._ */ function toUint24(uint256 value) internal pure returns (uint24) { require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits"); return uint24(value); } /** * @dev Returns the downcasted uint16 from uint256, reverting on * overflow (when the input is greater than largest uint16). * * Counterpart to Solidity's `uint16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v2.5._ */ function toUint16(uint256 value) internal pure returns (uint16) { require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits"); return uint16(value); } /** * @dev Returns the downcasted uint8 from uint256, reverting on * overflow (when the input is greater than largest uint8). * * Counterpart to Solidity's `uint8` operator. * * Requirements: * * - input must fit into 8 bits * * _Available since v2.5._ */ function toUint8(uint256 value) internal pure returns (uint8) { require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits"); return uint8(value); } /** * @dev Converts a signed int256 into an unsigned uint256. * * Requirements: * * - input must be greater than or equal to 0. * * _Available since v3.0._ */ function toUint256(int256 value) internal pure returns (uint256) { require(value >= 0, "SafeCast: value must be positive"); return uint256(value); } /** * @dev Returns the downcasted int248 from int256, reverting on * overflow (when the input is less than smallest int248 or * greater than largest int248). * * Counterpart to Solidity's `int248` operator. * * Requirements: * * - input must fit into 248 bits * * _Available since v4.7._ */ function toInt248(int256 value) internal pure returns (int248 downcasted) { downcasted = int248(value); require(downcasted == value, "SafeCast: value doesn't fit in 248 bits"); } /** * @dev Returns the downcasted int240 from int256, reverting on * overflow (when the input is less than smallest int240 or * greater than largest int240). * * Counterpart to Solidity's `int240` operator. * * Requirements: * * - input must fit into 240 bits * * _Available since v4.7._ */ function toInt240(int256 value) internal pure returns (int240 downcasted) { downcasted = int240(value); require(downcasted == value, "SafeCast: value doesn't fit in 240 bits"); } /** * @dev Returns the downcasted int232 from int256, reverting on * overflow (when the input is less than smallest int232 or * greater than largest int232). * * Counterpart to Solidity's `int232` operator. * * Requirements: * * - input must fit into 232 bits * * _Available since v4.7._ */ function toInt232(int256 value) internal pure returns (int232 downcasted) { downcasted = int232(value); require(downcasted == value, "SafeCast: value doesn't fit in 232 bits"); } /** * @dev Returns the downcasted int224 from int256, reverting on * overflow (when the input is less than smallest int224 or * greater than largest int224). * * Counterpart to Solidity's `int224` operator. * * Requirements: * * - input must fit into 224 bits * * _Available since v4.7._ */ function toInt224(int256 value) internal pure returns (int224 downcasted) { downcasted = int224(value); require(downcasted == value, "SafeCast: value doesn't fit in 224 bits"); } /** * @dev Returns the downcasted int216 from int256, reverting on * overflow (when the input is less than smallest int216 or * greater than largest int216). * * Counterpart to Solidity's `int216` operator. * * Requirements: * * - input must fit into 216 bits * * _Available since v4.7._ */ function toInt216(int256 value) internal pure returns (int216 downcasted) { downcasted = int216(value); require(downcasted == value, "SafeCast: value doesn't fit in 216 bits"); } /** * @dev Returns the downcasted int208 from int256, reverting on * overflow (when the input is less than smallest int208 or * greater than largest int208). * * Counterpart to Solidity's `int208` operator. * * Requirements: * * - input must fit into 208 bits * * _Available since v4.7._ */ function toInt208(int256 value) internal pure returns (int208 downcasted) { downcasted = int208(value); require(downcasted == value, "SafeCast: value doesn't fit in 208 bits"); } /** * @dev Returns the downcasted int200 from int256, reverting on * overflow (when the input is less than smallest int200 or * greater than largest int200). * * Counterpart to Solidity's `int200` operator. * * Requirements: * * - input must fit into 200 bits * * _Available since v4.7._ */ function toInt200(int256 value) internal pure returns (int200 downcasted) { downcasted = int200(value); require(downcasted == value, "SafeCast: value doesn't fit in 200 bits"); } /** * @dev Returns the downcasted int192 from int256, reverting on * overflow (when the input is less than smallest int192 or * greater than largest int192). * * Counterpart to Solidity's `int192` operator. * * Requirements: * * - input must fit into 192 bits * * _Available since v4.7._ */ function toInt192(int256 value) internal pure returns (int192 downcasted) { downcasted = int192(value); require(downcasted == value, "SafeCast: value doesn't fit in 192 bits"); } /** * @dev Returns the downcasted int184 from int256, reverting on * overflow (when the input is less than smallest int184 or * greater than largest int184). * * Counterpart to Solidity's `int184` operator. * * Requirements: * * - input must fit into 184 bits * * _Available since v4.7._ */ function toInt184(int256 value) internal pure returns (int184 downcasted) { downcasted = int184(value); require(downcasted == value, "SafeCast: value doesn't fit in 184 bits"); } /** * @dev Returns the downcasted int176 from int256, reverting on * overflow (when the input is less than smallest int176 or * greater than largest int176). * * Counterpart to Solidity's `int176` operator. * * Requirements: * * - input must fit into 176 bits * * _Available since v4.7._ */ function toInt176(int256 value) internal pure returns (int176 downcasted) { downcasted = int176(value); require(downcasted == value, "SafeCast: value doesn't fit in 176 bits"); } /** * @dev Returns the downcasted int168 from int256, reverting on * overflow (when the input is less than smallest int168 or * greater than largest int168). * * Counterpart to Solidity's `int168` operator. * * Requirements: * * - input must fit into 168 bits * * _Available since v4.7._ */ function toInt168(int256 value) internal pure returns (int168 downcasted) { downcasted = int168(value); require(downcasted == value, "SafeCast: value doesn't fit in 168 bits"); } /** * @dev Returns the downcasted int160 from int256, reverting on * overflow (when the input is less than smallest int160 or * greater than largest int160). * * Counterpart to Solidity's `int160` operator. * * Requirements: * * - input must fit into 160 bits * * _Available since v4.7._ */ function toInt160(int256 value) internal pure returns (int160 downcasted) { downcasted = int160(value); require(downcasted == value, "SafeCast: value doesn't fit in 160 bits"); } /** * @dev Returns the downcasted int152 from int256, reverting on * overflow (when the input is less than smallest int152 or * greater than largest int152). * * Counterpart to Solidity's `int152` operator. * * Requirements: * * - input must fit into 152 bits * * _Available since v4.7._ */ function toInt152(int256 value) internal pure returns (int152 downcasted) { downcasted = int152(value); require(downcasted == value, "SafeCast: value doesn't fit in 152 bits"); } /** * @dev Returns the downcasted int144 from int256, reverting on * overflow (when the input is less than smallest int144 or * greater than largest int144). * * Counterpart to Solidity's `int144` operator. * * Requirements: * * - input must fit into 144 bits * * _Available since v4.7._ */ function toInt144(int256 value) internal pure returns (int144 downcasted) { downcasted = int144(value); require(downcasted == value, "SafeCast: value doesn't fit in 144 bits"); } /** * @dev Returns the downcasted int136 from int256, reverting on * overflow (when the input is less than smallest int136 or * greater than largest int136). * * Counterpart to Solidity's `int136` operator. * * Requirements: * * - input must fit into 136 bits * * _Available since v4.7._ */ function toInt136(int256 value) internal pure returns (int136 downcasted) { downcasted = int136(value); require(downcasted == value, "SafeCast: value doesn't fit in 136 bits"); } /** * @dev Returns the downcasted int128 from int256, reverting on * overflow (when the input is less than smallest int128 or * greater than largest int128). * * Counterpart to Solidity's `int128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v3.1._ */ function toInt128(int256 value) internal pure returns (int128 downcasted) { downcasted = int128(value); require(downcasted == value, "SafeCast: value doesn't fit in 128 bits"); } /** * @dev Returns the downcasted int120 from int256, reverting on * overflow (when the input is less than smallest int120 or * greater than largest int120). * * Counterpart to Solidity's `int120` operator. * * Requirements: * * - input must fit into 120 bits * * _Available since v4.7._ */ function toInt120(int256 value) internal pure returns (int120 downcasted) { downcasted = int120(value); require(downcasted == value, "SafeCast: value doesn't fit in 120 bits"); } /** * @dev Returns the downcasted int112 from int256, reverting on * overflow (when the input is less than smallest int112 or * greater than largest int112). * * Counterpart to Solidity's `int112` operator. * * Requirements: * * - input must fit into 112 bits * * _Available since v4.7._ */ function toInt112(int256 value) internal pure returns (int112 downcasted) { downcasted = int112(value); require(downcasted == value, "SafeCast: value doesn't fit in 112 bits"); } /** * @dev Returns the downcasted int104 from int256, reverting on * overflow (when the input is less than smallest int104 or * greater than largest int104). * * Counterpart to Solidity's `int104` operator. * * Requirements: * * - input must fit into 104 bits * * _Available since v4.7._ */ function toInt104(int256 value) internal pure returns (int104 downcasted) { downcasted = int104(value); require(downcasted == value, "SafeCast: value doesn't fit in 104 bits"); } /** * @dev Returns the downcasted int96 from int256, reverting on * overflow (when the input is less than smallest int96 or * greater than largest int96). * * Counterpart to Solidity's `int96` operator. * * Requirements: * * - input must fit into 96 bits * * _Available since v4.7._ */ function toInt96(int256 value) internal pure returns (int96 downcasted) { downcasted = int96(value); require(downcasted == value, "SafeCast: value doesn't fit in 96 bits"); } /** * @dev Returns the downcasted int88 from int256, reverting on * overflow (when the input is less than smallest int88 or * greater than largest int88). * * Counterpart to Solidity's `int88` operator. * * Requirements: * * - input must fit into 88 bits * * _Available since v4.7._ */ function toInt88(int256 value) internal pure returns (int88 downcasted) { downcasted = int88(value); require(downcasted == value, "SafeCast: value doesn't fit in 88 bits"); } /** * @dev Returns the downcasted int80 from int256, reverting on * overflow (when the input is less than smallest int80 or * greater than largest int80). * * Counterpart to Solidity's `int80` operator. * * Requirements: * * - input must fit into 80 bits * * _Available since v4.7._ */ function toInt80(int256 value) internal pure returns (int80 downcasted) { downcasted = int80(value); require(downcasted == value, "SafeCast: value doesn't fit in 80 bits"); } /** * @dev Returns the downcasted int72 from int256, reverting on * overflow (when the input is less than smallest int72 or * greater than largest int72). * * Counterpart to Solidity's `int72` operator. * * Requirements: * * - input must fit into 72 bits * * _Available since v4.7._ */ function toInt72(int256 value) internal pure returns (int72 downcasted) { downcasted = int72(value); require(downcasted == value, "SafeCast: value doesn't fit in 72 bits"); } /** * @dev Returns the downcasted int64 from int256, reverting on * overflow (when the input is less than smallest int64 or * greater than largest int64). * * Counterpart to Solidity's `int64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v3.1._ */ function toInt64(int256 value) internal pure returns (int64 downcasted) { downcasted = int64(value); require(downcasted == value, "SafeCast: value doesn't fit in 64 bits"); } /** * @dev Returns the downcasted int56 from int256, reverting on * overflow (when the input is less than smallest int56 or * greater than largest int56). * * Counterpart to Solidity's `int56` operator. * * Requirements: * * - input must fit into 56 bits * * _Available since v4.7._ */ function toInt56(int256 value) internal pure returns (int56 downcasted) { downcasted = int56(value); require(downcasted == value, "SafeCast: value doesn't fit in 56 bits"); } /** * @dev Returns the downcasted int48 from int256, reverting on * overflow (when the input is less than smallest int48 or * greater than largest int48). * * Counterpart to Solidity's `int48` operator. * * Requirements: * * - input must fit into 48 bits * * _Available since v4.7._ */ function toInt48(int256 value) internal pure returns (int48 downcasted) { downcasted = int48(value); require(downcasted == value, "SafeCast: value doesn't fit in 48 bits"); } /** * @dev Returns the downcasted int40 from int256, reverting on * overflow (when the input is less than smallest int40 or * greater than largest int40). * * Counterpart to Solidity's `int40` operator. * * Requirements: * * - input must fit into 40 bits * * _Available since v4.7._ */ function toInt40(int256 value) internal pure returns (int40 downcasted) { downcasted = int40(value); require(downcasted == value, "SafeCast: value doesn't fit in 40 bits"); } /** * @dev Returns the downcasted int32 from int256, reverting on * overflow (when the input is less than smallest int32 or * greater than largest int32). * * Counterpart to Solidity's `int32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v3.1._ */ function toInt32(int256 value) internal pure returns (int32 downcasted) { downcasted = int32(value); require(downcasted == value, "SafeCast: value doesn't fit in 32 bits"); } /** * @dev Returns the downcasted int24 from int256, reverting on * overflow (when the input is less than smallest int24 or * greater than largest int24). * * Counterpart to Solidity's `int24` operator. * * Requirements: * * - input must fit into 24 bits * * _Available since v4.7._ */ function toInt24(int256 value) internal pure returns (int24 downcasted) { downcasted = int24(value); require(downcasted == value, "SafeCast: value doesn't fit in 24 bits"); } /** * @dev Returns the downcasted int16 from int256, reverting on * overflow (when the input is less than smallest int16 or * greater than largest int16). * * Counterpart to Solidity's `int16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v3.1._ */ function toInt16(int256 value) internal pure returns (int16 downcasted) { downcasted = int16(value); require(downcasted == value, "SafeCast: value doesn't fit in 16 bits"); } /** * @dev Returns the downcasted int8 from int256, reverting on * overflow (when the input is less than smallest int8 or * greater than largest int8). * * Counterpart to Solidity's `int8` operator. * * Requirements: * * - input must fit into 8 bits * * _Available since v3.1._ */ function toInt8(int256 value) internal pure returns (int8 downcasted) { downcasted = int8(value); require(downcasted == value, "SafeCast: value doesn't fit in 8 bits"); } /** * @dev Converts an unsigned uint256 into a signed int256. * * Requirements: * * - input must be less than or equal to maxInt256. * * _Available since v3.0._ */ function toInt256(uint256 value) internal pure returns (int256) { // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256"); return int256(value); } }
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; // ========================= SturdyPairCore ========================= import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { ReentrancyGuard } from "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol"; import { SturdyPairAccessControl } from "./SturdyPairAccessControl.sol"; import { SturdyPairConstants } from "./SturdyPairConstants.sol"; import { VaultAccount, VaultAccountingLibrary } from "./libraries/VaultAccount.sol"; import { SafeERC20 } from "./libraries/SafeERC20.sol"; import { IDualOracle } from "./interfaces/IDualOracle.sol"; import { IRateCalculatorV2 } from "./interfaces/IRateCalculatorV2.sol"; import { ISwapper } from "./interfaces/ISwapper.sol"; /// @title SturdyPairCore /// @author Drake Evans (Frax Finance) https://github.com/drakeevans /// @notice An abstract contract which contains the core logic and storage for the SturdyPair abstract contract SturdyPairCore is SturdyPairAccessControl, SturdyPairConstants, ERC20, ReentrancyGuard { using VaultAccountingLibrary for VaultAccount; using SafeERC20 for IERC20; using SafeCast for uint256; function version() external pure returns (uint256 _major, uint256 _minor, uint256 _patch) { _major = 3; _minor = 0; _patch = 0; } // ============================================================================================ // Settings set by constructor() // ============================================================================================ // Asset and collateral contracts IERC20 internal immutable assetContract; IERC20 public immutable collateralContract; // LTV Settings /// @notice The maximum LTV allowed for this pair /// @dev 1e5 precision uint256 public maxLTV; // Liquidation Fees /// @notice The liquidation fee, given as a % of repayment amount, when all collateral is consumed in liquidation /// @dev 1e5 precision uint256 public cleanLiquidationFee; /// @notice The liquidation fee, given as % of repayment amount, when some collateral remains for borrower /// @dev 1e5 precision uint256 public dirtyLiquidationFee; /// @notice The portion of the liquidation fee given to protocol /// @dev 1e5 precision uint256 public protocolLiquidationFee; // Interest Rate Calculator Contract IRateCalculatorV2 public rateContract; // For complex rate calculations // Swapper mapping(address => bool) public swappers; // approved swapper addresses // ERC20 Metadata string internal nameOfContract; string internal symbolOfContract; uint8 internal immutable decimalsOfContract; // ============================================================================================ // Storage // ============================================================================================ /// @notice Stores information about the current interest rate /// @dev struct is packed to reduce SLOADs. feeToProtocolRate is 1e5 precision, ratePerSec & fullUtilizationRate is 1e18 precision CurrentRateInfo public currentRateInfo; struct CurrentRateInfo { uint32 lastBlock; uint32 feeToProtocolRate; // Fee amount 1e5 precision uint64 lastTimestamp; uint64 ratePerSec; uint64 fullUtilizationRate; } /// @notice Stores information about the current exchange rate. Collateral:Asset ratio /// @dev Struct packed to save SLOADs. Amount of Collateral Token to buy 1e18 Asset Token ExchangeRateInfo public exchangeRateInfo; struct ExchangeRateInfo { address oracle; uint32 maxOracleDeviation; // % of larger number, 1e5 precision uint184 lastTimestamp; uint256 lowExchangeRate; uint256 highExchangeRate; } // Contract Level Accounting VaultAccount public totalAsset; // amount = total amount of assets, shares = total shares outstanding VaultAccount public totalBorrow; // amount = total borrow amount with interest accrued, shares = total shares outstanding uint256 public totalCollateral; // total amount of collateral in contract // User Level Accounting /// @notice Stores the balance of collateral for each user mapping(address => uint256) public userCollateralBalance; // amount of collateral each user is backed /// @notice Stores the balance of borrow shares for each user mapping(address => uint256) public userBorrowShares; // represents the shares held by individuals /// @notice Stores the borrow allowance of the user mapping(address => mapping(address => uint256)) public userBorrowAllowances; // represent the borrowable amount on behalfof user /// @notice Stores the whitelisted delegators who call the removeCollateralFrom(), ex: Leverage contracts mapping(address => bool) public whitelistedDelegators; // represent the leverage contract who call the removeCollateralFrom() // NOTE: user shares of assets are represented as ERC-20 tokens and accessible via balanceOf() // ============================================================================================ // Constructor // ============================================================================================ /// @notice The ```constructor``` function is called on deployment /// @param _configData abi.encode(address _asset, address _collateral, address _oracle, uint32 _maxOracleDeviation, address _rateContract, uint64 _fullUtilizationRate, uint256 _maxLTV, uint256 _cleanLiquidationFee, uint256 _dirtyLiquidationFee, uint256 _protocolLiquidationFee) /// @param _immutables abi.encode(address _circuitBreakerAddress, address _comptrollerAddress, address _timelockAddress) /// @param _customConfigData abi.encode(string memory _nameOfContract, string memory _symbolOfContract, uint8 _decimalsOfContract) constructor( bytes memory _configData, bytes memory _immutables, bytes memory _customConfigData ) SturdyPairAccessControl(_immutables) ERC20("", "") { { ( address _asset, address _collateral, address _oracle, uint32 _maxOracleDeviation, address _rateContract, uint64 _fullUtilizationRate, uint256 _maxLTV, uint256 _liquidationFee, uint256 _protocolLiquidationFee ) = abi.decode( _configData, (address, address, address, uint32, address, uint64, uint256, uint256, uint256) ); // Pair Settings assetContract = IERC20(_asset); collateralContract = IERC20(_collateral); currentRateInfo.feeToProtocolRate = 0; currentRateInfo.fullUtilizationRate = _fullUtilizationRate; currentRateInfo.lastTimestamp = uint64(block.timestamp - 1); currentRateInfo.lastBlock = uint32(block.number - 1); exchangeRateInfo.oracle = _oracle; exchangeRateInfo.maxOracleDeviation = _maxOracleDeviation; rateContract = IRateCalculatorV2(_rateContract); //Liquidation Fee Settings cleanLiquidationFee = _liquidationFee; dirtyLiquidationFee = (_liquidationFee * 90_000) / LIQ_PRECISION; // 90% of clean fee protocolLiquidationFee = _protocolLiquidationFee; // set maxLTV maxLTV = _maxLTV; } { (string memory _nameOfContract, string memory _symbolOfContract, uint8 _decimalsOfContract) = abi.decode( _customConfigData, (string, string, uint8) ); // ERC20 Metadata nameOfContract = _nameOfContract; symbolOfContract = _symbolOfContract; decimalsOfContract = _decimalsOfContract; // Instantiate Interest _addInterest(); // Instantiate Exchange Rate _updateExchangeRate(); } } // ============================================================================================ // Internal Helpers // ============================================================================================ /// @notice The ```_totalAssetAvailable``` function returns the total balance of Asset Tokens in the contract /// @param _totalAsset VaultAccount struct which stores total amount and shares for assets /// @param _totalBorrow VaultAccount struct which stores total amount and shares for borrows /// @return The balance of Asset Tokens held by contract function _totalAssetAvailable( VaultAccount memory _totalAsset, VaultAccount memory _totalBorrow ) internal pure returns (uint256) { return _totalAsset.amount - _totalBorrow.amount; } /// @notice The ```_isSolvent``` function determines if a given borrower is solvent given an exchange rate /// @param _borrower The borrower address to check /// @param _exchangeRate The exchange rate, i.e. the amount of collateral to buy 1e18 asset /// @return Whether borrower is solvent function _isSolvent(address _borrower, uint256 _exchangeRate) internal view returns (bool) { if (maxLTV == 0) return true; uint256 _borrowerAmount = totalBorrow.toAmount(userBorrowShares[_borrower], true); if (_borrowerAmount == 0) return true; uint256 _collateralAmount = userCollateralBalance[_borrower]; if (_collateralAmount == 0) return false; uint256 _ltv = (((_borrowerAmount * _exchangeRate) / EXCHANGE_PRECISION) * LTV_PRECISION) / _collateralAmount; return _ltv <= maxLTV; } // ============================================================================================ // Modifiers // ============================================================================================ /// @notice Checks for solvency AFTER executing contract code /// @param _borrower The borrower whose solvency we will check modifier isSolvent(address _borrower) { _; ExchangeRateInfo memory _exchangeRateInfo = exchangeRateInfo; if (!_isSolvent(_borrower, exchangeRateInfo.highExchangeRate)) { revert Insolvent( totalBorrow.toAmount(userBorrowShares[_borrower], true), userCollateralBalance[_borrower], exchangeRateInfo.highExchangeRate ); } } // ============================================================================================ // Functions: Interest Accumulation and Adjustment // ============================================================================================ /// @notice The ```AddInterest``` event is emitted when interest is accrued by borrowers /// @param interestEarned The total interest accrued by all borrowers /// @param rate The interest rate used to calculate accrued interest /// @param feesAmount The amount of fees paid to protocol /// @param feesShare The amount of shares distributed to protocol event AddInterest(uint256 interestEarned, uint256 rate, uint256 feesAmount, uint256 feesShare); /// @notice The ```UpdateRate``` event is emitted when the interest rate is updated /// @param oldRatePerSec The old interest rate (per second) /// @param oldFullUtilizationRate The old full utilization rate /// @param newRatePerSec The new interest rate (per second) /// @param newFullUtilizationRate The new full utilization rate event UpdateRate( uint256 oldRatePerSec, uint256 oldFullUtilizationRate, uint256 newRatePerSec, uint256 newFullUtilizationRate ); /// @notice The ```addInterest``` function is a public implementation of _addInterest and allows 3rd parties to trigger interest accrual /// @return _interestEarned The amount of interest accrued by all borrowers /// @return _feesAmount The amount of fees paid to protocol /// @return _feesShare The amount of shares distributed to protocol /// @return _currentRateInfo The new rate info struct /// @return _totalAsset The new total asset struct /// @return _totalBorrow The new total borrow struct function addInterest( bool _returnAccounting ) external nonReentrant returns ( uint256 _interestEarned, uint256 _feesAmount, uint256 _feesShare, CurrentRateInfo memory _currentRateInfo, VaultAccount memory _totalAsset, VaultAccount memory _totalBorrow ) { (, _interestEarned, _feesAmount, _feesShare, _currentRateInfo) = _addInterest(); if (_returnAccounting) { _totalAsset = totalAsset; _totalBorrow = totalBorrow; } } /// @notice The ```previewAddInterest``` function /// @return _interestEarned The amount of interest accrued by all borrowers /// @return _feesAmount The amount of fees paid to protocol /// @return _feesShare The amount of shares distributed to protocol /// @return _newCurrentRateInfo The new rate info struct /// @return _totalAsset The new total asset struct /// @return _totalBorrow The new total borrow struct function previewAddInterest() public view returns ( uint256 _interestEarned, uint256 _feesAmount, uint256 _feesShare, CurrentRateInfo memory _newCurrentRateInfo, VaultAccount memory _totalAsset, VaultAccount memory _totalBorrow ) { _newCurrentRateInfo = currentRateInfo; // Write return values InterestCalculationResults memory _results = _calculateInterest(_newCurrentRateInfo); if (_results.isInterestUpdated) { _interestEarned = _results.interestEarned; _feesAmount = _results.feesAmount; _feesShare = _results.feesShare; _newCurrentRateInfo.ratePerSec = _results.newRate; _newCurrentRateInfo.fullUtilizationRate = _results.newFullUtilizationRate; _totalAsset = _results.totalAsset; _totalBorrow = _results.totalBorrow; } else { _totalAsset = totalAsset; _totalBorrow = totalBorrow; } } struct InterestCalculationResults { bool isInterestUpdated; uint64 newRate; uint64 newFullUtilizationRate; uint256 interestEarned; uint256 feesAmount; uint256 feesShare; VaultAccount totalAsset; VaultAccount totalBorrow; } /// @notice The ```_calculateInterest``` function calculates the interest to be accrued and the new interest rate info /// @param _currentRateInfo The current rate info /// @return _results The results of the interest calculation function _calculateInterest( CurrentRateInfo memory _currentRateInfo ) internal view returns (InterestCalculationResults memory _results) { // Short circuit if interest already calculated this block OR if interest is paused if (_currentRateInfo.lastTimestamp != block.timestamp && !isInterestPaused) { // Indicate that interest is updated and calculated _results.isInterestUpdated = true; // Write return values and use these to save gas _results.totalAsset = totalAsset; _results.totalBorrow = totalBorrow; // Time elapsed since last interest update uint256 _deltaTime = block.timestamp - _currentRateInfo.lastTimestamp; // Get the utilization rate uint256 _utilizationRate = _results.totalAsset.amount == 0 ? 0 : (UTIL_PREC * _results.totalBorrow.amount) / _results.totalAsset.amount; // Request new interest rate and full utilization rate from the rate calculator (_results.newRate, _results.newFullUtilizationRate) = IRateCalculatorV2(rateContract).getNewRate( _deltaTime, _utilizationRate, _currentRateInfo.fullUtilizationRate ); // Calculate interest accrued _results.interestEarned = (_deltaTime * _results.totalBorrow.amount * _results.newRate) / RATE_PRECISION; // Accrue interest (if any) and fees iff no overflow if ( _results.interestEarned > 0 && _results.interestEarned + _results.totalBorrow.amount <= type(uint128).max && _results.interestEarned + _results.totalAsset.amount <= type(uint128).max ) { // Increment totalBorrow and totalAsset by interestEarned _results.totalBorrow.amount += uint128(_results.interestEarned); _results.totalAsset.amount += uint128(_results.interestEarned); if (_currentRateInfo.feeToProtocolRate > 0) { _results.feesAmount = (_results.interestEarned * _currentRateInfo.feeToProtocolRate) / FEE_PRECISION; _results.feesShare = (_results.feesAmount * _results.totalAsset.shares) / (_results.totalAsset.amount - _results.feesAmount); // Effects: Give new shares to this contract, effectively diluting lenders an amount equal to the fees // We can safely cast because _feesShare < _feesAmount < interestEarned which is always less than uint128 _results.totalAsset.shares += uint128(_results.feesShare); } } } } /// @notice The ```_addInterest``` function is invoked prior to every external function and is used to accrue interest and update interest rate /// @dev Can only called once per block /// @return _isInterestUpdated True if interest was calculated /// @return _interestEarned The amount of interest accrued by all borrowers /// @return _feesAmount The amount of fees paid to protocol /// @return _feesShare The amount of shares distributed to protocol /// @return _currentRateInfo The new rate info struct function _addInterest() internal returns ( bool _isInterestUpdated, uint256 _interestEarned, uint256 _feesAmount, uint256 _feesShare, CurrentRateInfo memory _currentRateInfo ) { // Pull from storage and set default return values _currentRateInfo = currentRateInfo; // Calc interest InterestCalculationResults memory _results = _calculateInterest(_currentRateInfo); // Write return values only if interest was updated and calculated if (_results.isInterestUpdated) { _isInterestUpdated = _results.isInterestUpdated; _interestEarned = _results.interestEarned; _feesAmount = _results.feesAmount; _feesShare = _results.feesShare; // emit here so that we have access to the old values emit UpdateRate( _currentRateInfo.ratePerSec, _currentRateInfo.fullUtilizationRate, _results.newRate, _results.newFullUtilizationRate ); emit AddInterest(_interestEarned, _results.newRate, _feesAmount, _feesShare); // overwrite original values _currentRateInfo.ratePerSec = _results.newRate; _currentRateInfo.fullUtilizationRate = _results.newFullUtilizationRate; _currentRateInfo.lastTimestamp = uint64(block.timestamp); _currentRateInfo.lastBlock = uint32(block.number); // Effects: write to state currentRateInfo = _currentRateInfo; totalAsset = _results.totalAsset; totalBorrow = _results.totalBorrow; if (_feesShare > 0) _mint(address(this), _feesShare); } } // ============================================================================================ // Functions: ExchangeRate // ============================================================================================ /// @notice The ```UpdateExchangeRate``` event is emitted when the Collateral:Asset exchange rate is updated /// @param lowExchangeRate The low exchange rate /// @param highExchangeRate The high exchange rate event UpdateExchangeRate(uint256 lowExchangeRate, uint256 highExchangeRate); /// @notice The ```WarnOracleData``` event is emitted when one of the oracles has stale or otherwise problematic data /// @param oracle The oracle address event WarnOracleData(address oracle); /// @notice The ```updateExchangeRate``` function is the external implementation of _updateExchangeRate. /// @dev This function is invoked at most once per block as these queries can be expensive /// @return _isBorrowAllowed True if deviation is within bounds /// @return _lowExchangeRate The low exchange rate /// @return _highExchangeRate The high exchange rate function updateExchangeRate() external nonReentrant returns (bool _isBorrowAllowed, uint256 _lowExchangeRate, uint256 _highExchangeRate) { return _updateExchangeRate(); } /// @notice The ```_updateExchangeRate``` function retrieves the latest exchange rate. i.e how much collateral to buy 1e18 asset. /// @dev This function is invoked at most once per block as these queries can be expensive /// @return _isBorrowAllowed True if deviation is within bounds /// @return _lowExchangeRate The low exchange rate /// @return _highExchangeRate The high exchange rate function _updateExchangeRate() internal returns (bool _isBorrowAllowed, uint256 _lowExchangeRate, uint256 _highExchangeRate) { // Pull from storage to save gas and set default return values ExchangeRateInfo memory _exchangeRateInfo = exchangeRateInfo; // Short circuit if already updated this block if (_exchangeRateInfo.lastTimestamp != block.timestamp) { // Get the latest exchange rate from the dual oracle bool _oneOracleBad; (_oneOracleBad, _lowExchangeRate, _highExchangeRate) = IDualOracle(_exchangeRateInfo.oracle).getPrices(); // If one oracle is bad data, emit an event for off-chain monitoring if (_oneOracleBad) emit WarnOracleData(_exchangeRateInfo.oracle); // Effects: Bookkeeping and write to storage _exchangeRateInfo.lastTimestamp = uint184(block.timestamp); _exchangeRateInfo.lowExchangeRate = _lowExchangeRate; _exchangeRateInfo.highExchangeRate = _highExchangeRate; exchangeRateInfo = _exchangeRateInfo; emit UpdateExchangeRate(_lowExchangeRate, _highExchangeRate); } else { // Use default return values if already updated this block _lowExchangeRate = _exchangeRateInfo.lowExchangeRate; _highExchangeRate = _exchangeRateInfo.highExchangeRate; } uint256 _deviation = (DEVIATION_PRECISION * (_exchangeRateInfo.highExchangeRate - _exchangeRateInfo.lowExchangeRate)) / _exchangeRateInfo.highExchangeRate; if (_deviation <= _exchangeRateInfo.maxOracleDeviation) { _isBorrowAllowed = true; } } // ============================================================================================ // Functions: Lending // ============================================================================================ /// @notice The ```Deposit``` event fires when a user deposits assets to the pair /// @param caller the msg.sender /// @param owner the account the fTokens are sent to /// @param assets the amount of assets deposited /// @param shares the number of fTokens minted event Deposit(address indexed caller, address indexed owner, uint256 assets, uint256 shares); /// @notice The ```_deposit``` function is the internal implementation for lending assets /// @dev Caller must invoke ```ERC20.approve``` on the Asset Token contract prior to calling function /// @param _totalAsset An in memory VaultAccount struct representing the total amounts and shares for the Asset Token /// @param _amount The amount of Asset Token to be transferred /// @param _shares The amount of Asset Shares (fTokens) to be minted /// @param _receiver The address to receive the Asset Shares (fTokens) function _deposit(VaultAccount memory _totalAsset, uint128 _amount, uint128 _shares, address _receiver) internal { // Effects: bookkeeping _totalAsset.amount += _amount; _totalAsset.shares += _shares; // Effects: write back to storage _mint(_receiver, _shares); totalAsset = _totalAsset; // Interactions assetContract.safeTransferFrom(msg.sender, address(this), _amount); emit Deposit(msg.sender, _receiver, _amount, _shares); } function previewDeposit(uint256 _assets) external view returns (uint256 _sharesReceived) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); _sharesReceived = _totalAsset.toShares(_assets, false); } /// @notice The ```deposit``` function allows a user to Lend Assets by specifying the amount of Asset Tokens to lend /// @dev Caller must invoke ```ERC20.approve``` on the Asset Token contract prior to calling function /// @param _amount The amount of Asset Token to transfer to Pair /// @param _receiver The address to receive the Asset Shares (fTokens) /// @return _sharesReceived The number of fTokens received for the deposit function deposit(uint256 _amount, address _receiver) external nonReentrant returns (uint256 _sharesReceived) { if (_receiver == address(0)) revert InvalidReceiver(); // Accrue interest if necessary _addInterest(); // Pull from storage to save gas VaultAccount memory _totalAsset = totalAsset; // Check if this deposit will violate the deposit limit if (depositLimit < _totalAsset.amount + _amount) revert ExceedsDepositLimit(); // Calculate the number of fTokens to mint _sharesReceived = _totalAsset.toShares(_amount, false); // Execute the deposit effects _deposit(_totalAsset, _amount.toUint128(), _sharesReceived.toUint128(), _receiver); } function previewMint(uint256 _shares) external view returns (uint256 _amount) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); _amount = _totalAsset.toAmount(_shares, false); } function mint(uint256 _shares, address _receiver) external nonReentrant returns (uint256 _amount) { if (_receiver == address(0)) revert InvalidReceiver(); // Accrue interest if necessary _addInterest(); // Pull from storage to save gas VaultAccount memory _totalAsset = totalAsset; // Calculate the number of assets to transfer based on the shares to mint _amount = _totalAsset.toAmount(_shares, false); // Check if this deposit will violate the deposit limit if (depositLimit < _totalAsset.amount + _amount) revert ExceedsDepositLimit(); // Execute the deposit effects _deposit(_totalAsset, _amount.toUint128(), _shares.toUint128(), _receiver); } /// @notice The ```Withdraw``` event fires when a user redeems their fTokens for the underlying asset /// @param caller the msg.sender /// @param receiver The address to which the underlying asset will be transferred to /// @param owner The owner of the fTokens /// @param assets The assets transferred /// @param shares The number of fTokens burned event Withdraw( address indexed caller, address indexed receiver, address indexed owner, uint256 assets, uint256 shares ); /// @notice The ```_redeem``` function is an internal implementation which allows a Lender to pull their Asset Tokens out of the Pair /// @dev Caller must invoke ```ERC20.approve``` on the Asset Token contract prior to calling function /// @param _totalAsset An in-memory VaultAccount struct which holds the total amount of Asset Tokens and the total number of Asset Shares (fTokens) /// @param _amountToReturn The number of Asset Tokens to return /// @param _shares The number of Asset Shares (fTokens) to burn /// @param _receiver The address to which the Asset Tokens will be transferred /// @param _owner The owner of the Asset Shares (fTokens) function _redeem( VaultAccount memory _totalAsset, uint128 _amountToReturn, uint128 _shares, address _receiver, address _owner ) internal { // Check for sufficient allowance/approval if necessary if (msg.sender != _owner) { uint256 allowed = allowance(_owner, msg.sender); // NOTE: This will revert on underflow ensuring that allowance > shares if (allowed != type(uint256).max) _approve(_owner, msg.sender, allowed - _shares); } // Check for sufficient withdraw liquidity (not strictly necessary because balance will underflow) uint256 _assetsAvailable = _totalAssetAvailable(_totalAsset, totalBorrow); if (_assetsAvailable < _amountToReturn) { revert InsufficientAssetsInContract(_assetsAvailable, _amountToReturn); } // Effects: bookkeeping _totalAsset.amount -= _amountToReturn; _totalAsset.shares -= _shares; // Effects: write to storage totalAsset = _totalAsset; _burn(_owner, _shares); // Interactions assetContract.safeTransfer(_receiver, _amountToReturn); emit Withdraw(msg.sender, _receiver, _owner, _amountToReturn, _shares); } function previewRedeem(uint256 _shares) external view returns (uint256 _assets) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); _assets = _totalAsset.toAmount(_shares, false); } /// @notice The ```redeem``` function allows the caller to redeem their Asset Shares for Asset Tokens /// @param _shares The number of Asset Shares (fTokens) to burn for Asset Tokens /// @param _receiver The address to which the Asset Tokens will be transferred /// @param _owner The owner of the Asset Shares (fTokens) /// @return _amountToReturn The amount of Asset Tokens to be transferred function redeem( uint256 _shares, address _receiver, address _owner ) external nonReentrant returns (uint256 _amountToReturn) { if (_receiver == address(0)) revert InvalidReceiver(); // Check if withdraw is paused and revert if necessary if (isWithdrawPaused) revert WithdrawPaused(); // Accrue interest if necessary _addInterest(); // Pull from storage to save gas VaultAccount memory _totalAsset = totalAsset; // Calculate the number of assets to transfer based on the shares to burn _amountToReturn = _totalAsset.toAmount(_shares, false); // Execute the withdraw effects _redeem(_totalAsset, _amountToReturn.toUint128(), _shares.toUint128(), _receiver, _owner); } /// @notice The ```previewWithdraw``` function returns the number of Asset Shares (fTokens) that would be burned for a given amount of Asset Tokens /// @param _amount The amount of Asset Tokens to be withdrawn /// @return _sharesToBurn The number of shares that would be burned function previewWithdraw(uint256 _amount) external view returns (uint256 _sharesToBurn) { (, , , , VaultAccount memory _totalAsset, ) = previewAddInterest(); _sharesToBurn = _totalAsset.toShares(_amount, true); } /// @notice The ```withdraw``` function allows the caller to withdraw their Asset Tokens for a given amount of fTokens /// @param _amount The amount to withdraw /// @param _receiver The address to which the Asset Tokens will be transferred /// @param _owner The owner of the Asset Shares (fTokens) /// @return _sharesToBurn The number of shares (fTokens) that were burned function withdraw( uint256 _amount, address _receiver, address _owner ) external nonReentrant returns (uint256 _sharesToBurn) { if (_receiver == address(0)) revert InvalidReceiver(); // Check if withdraw is paused and revert if necessary if (isWithdrawPaused) revert WithdrawPaused(); // Accrue interest if necessary _addInterest(); // Pull from storage to save gas VaultAccount memory _totalAsset = totalAsset; // Calculate the number of shares to burn based on the amount to withdraw _sharesToBurn = _totalAsset.toShares(_amount, true); // Execute the withdraw effects _redeem(_totalAsset, _amount.toUint128(), _sharesToBurn.toUint128(), _receiver, _owner); } // ============================================================================================ // Functions: Borrowing // ============================================================================================ /// @notice The ```BorrowAsset``` event is emitted when a borrower increases their position /// @param _borrower The borrower whose account was debited /// @param _receiver The address to which the Asset Tokens were transferred /// @param _borrowAmount The amount of Asset Tokens transferred /// @param _sharesAdded The number of Borrow Shares the borrower was debited event BorrowAsset( address indexed _borrower, address indexed _receiver, uint256 _borrowAmount, uint256 _sharesAdded ); /// @notice The ```_borrowAsset``` function is the internal implementation for borrowing assets /// @param _borrowAmount The amount of the Asset Token to borrow /// @param _receiver The address to receive the Asset Tokens /// @return _sharesAdded The amount of borrow shares the msg.sender will be debited function _borrowAsset(uint128 _borrowAmount, address _receiver) internal returns (uint256 _sharesAdded) { // Get borrow accounting from storage to save gas VaultAccount memory _totalBorrow = totalBorrow; // Check available capital (not strictly necessary because balance will underflow, but better revert message) uint256 _assetsAvailable = _totalAssetAvailable(totalAsset, _totalBorrow); if (_assetsAvailable < _borrowAmount) { revert InsufficientAssetsInContract(_assetsAvailable, _borrowAmount); } // Calculate the number of shares to add based on the amount to borrow _sharesAdded = _totalBorrow.toShares(_borrowAmount, true); // Effects: Bookkeeping to add shares & amounts to total Borrow accounting _totalBorrow.amount += _borrowAmount; _totalBorrow.shares += uint128(_sharesAdded); // NOTE: we can safely cast here because shares are always less than amount and _borrowAmount is uint128 // Effects: write back to storage totalBorrow = _totalBorrow; userBorrowShares[msg.sender] += _sharesAdded; // Interactions if (_receiver != address(this)) { assetContract.safeTransfer(_receiver, _borrowAmount); } emit BorrowAsset(msg.sender, _receiver, _borrowAmount, _sharesAdded); } /// @notice The ```_borrowAssetOnBehalfOf``` function is the internal implementation for borrowing assets on behalf of borrower /// @dev msg.sender will receive the Asset Tokens /// @param _borrowAmount The amount of the Asset Token to borrow /// @param _onBehalfOf The address which will receive the debt. Should be the address of the borrower itself /// @return _sharesAdded The amount of borrow shares the _onBehalfOf will be debited function _borrowAssetOnBehalfOf(uint128 _borrowAmount, address _onBehalfOf) internal returns (uint256 _sharesAdded) { // Get borrow accounting from storage to save gas VaultAccount memory _totalBorrow = totalBorrow; // Check available capital (not strictly necessary because balance will underflow, but better revert message) uint256 _assetsAvailable = _totalAssetAvailable(totalAsset, _totalBorrow); if (_assetsAvailable < _borrowAmount) { revert InsufficientAssetsInContract(_assetsAvailable, _borrowAmount); } // decrease borrowAllowance (borrowing power) uint256 newAllowance = userBorrowAllowances[_onBehalfOf][msg.sender] - _borrowAmount; userBorrowAllowances[_onBehalfOf][msg.sender] = newAllowance; emit UserBorrowAllowanceDelegated(_onBehalfOf, msg.sender, newAllowance); // Calculate the number of shares to add based on the amount to borrow _sharesAdded = _totalBorrow.toShares(_borrowAmount, true); // Effects: Bookkeeping to add shares & amounts to total Borrow accounting _totalBorrow.amount += _borrowAmount; _totalBorrow.shares += uint128(_sharesAdded); // NOTE: we can safely cast here because shares are always less than amount and _borrowAmount is uint128 // Effects: write back to storage totalBorrow = _totalBorrow; userBorrowShares[_onBehalfOf] += _sharesAdded; // Interactions assetContract.safeTransfer(msg.sender, _borrowAmount); emit BorrowAsset(_onBehalfOf, msg.sender, _borrowAmount, _sharesAdded); } /// @notice The ```borrowAsset``` function allows a user to open/increase a borrow position /// @dev Borrower must call ```ERC20.approve``` on the Collateral Token contract if applicable /// @param _borrowAmount The amount of Asset Token to borrow /// @param _collateralAmount The amount of Collateral Token to transfer to Pair /// @param _receiver The address which will receive the Asset Tokens /// @return _shares The number of borrow Shares the msg.sender will be debited function borrowAsset( uint256 _borrowAmount, uint256 _collateralAmount, address _receiver ) external nonReentrant isSolvent(msg.sender) returns (uint256 _shares) { if (_receiver == address(0)) revert InvalidReceiver(); // Accrue interest if necessary _addInterest(); // Check if borrow will violate the borrow limit and revert if necessary if (borrowLimit < totalBorrow.amount + _borrowAmount) revert ExceedsBorrowLimit(); // Update _exchangeRate and check if borrow is allowed based on deviation (bool _isBorrowAllowed, , ) = _updateExchangeRate(); if (!_isBorrowAllowed) revert ExceedsMaxOracleDeviation(); // Only add collateral if necessary if (_collateralAmount > 0) { _addCollateral(msg.sender, _collateralAmount, msg.sender); } // Effects: Call internal borrow function _shares = _borrowAsset(_borrowAmount.toUint128(), _receiver); } /// @notice The ```borrowAssetOnBehalfOf``` function allows a user to open/increase a borrow position on behalf of borrower /// @dev msg.sender will receive the Asset Tokens /// @param _borrowAmount The amount of Asset Token to borrow /// @param _onBehalfOf The address which will receive the debt. Should be the address of the borrower itself /// @return _shares The number of borrow Shares the _onBehalfOf will be debited function borrowAssetOnBehalfOf( uint256 _borrowAmount, address _onBehalfOf ) external nonReentrant isSolvent(_onBehalfOf) returns (uint256 _shares) { if (_onBehalfOf == address(0) || msg.sender == _onBehalfOf) revert InvalidOnBehalfOf(); // Accrue interest if necessary _addInterest(); // Check if borrow will violate the borrow limit and revert if necessary if (borrowLimit < totalBorrow.amount + _borrowAmount) revert ExceedsBorrowLimit(); // Update _exchangeRate and check if borrow is allowed based on deviation (bool _isBorrowAllowed, , ) = _updateExchangeRate(); if (!_isBorrowAllowed) revert ExceedsMaxOracleDeviation(); // Effects: Call internal borrow function _shares = _borrowAssetOnBehalfOf(_borrowAmount.toUint128(), _onBehalfOf); } /// @notice The ```UserBorrowAllowanceDelegated``` event is emitted when a borrower delegates borrowing power to a user /// @param _fromUser The borrower who delegates borrowing power /// @param _toUser The user who receive the borrowing power from borrower /// @param _amount The max amount being delegated event UserBorrowAllowanceDelegated( address indexed _fromUser, address indexed _toUser, uint256 _amount ); /// @notice The ```approveBorrowDelegation``` function delegates borrowing power to a user /// @param _delegatee the address receiving the delegated borrowing power /// @param _amount the maximum amount being delegated. function approveBorrowDelegation(address _delegatee, uint256 _amount) external { // To change the approve amount you first have to reduce the addresses` // allowance to zero by calling `approveBorrowDelegation(_delegatee, 0)` if it is not // already 0 to mitigate the race condition described here: // https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 if ((_amount != 0) && (userBorrowAllowances[msg.sender][_delegatee] != 0)) { revert InvalidApproveBorrowDelegation(); } userBorrowAllowances[msg.sender][_delegatee] = _amount; emit UserBorrowAllowanceDelegated(msg.sender, _delegatee, _amount); } /// @notice The ```AddCollateral``` event is emitted when a borrower adds collateral to their position /// @param sender The source of funds for the new collateral /// @param borrower The borrower account for which the collateral should be credited /// @param collateralAmount The amount of Collateral Token to be transferred event AddCollateral(address indexed sender, address indexed borrower, uint256 collateralAmount); /// @notice The ```_addCollateral``` function is an internal implementation for adding collateral to a borrowers position /// @param _sender The source of funds for the new collateral /// @param _collateralAmount The amount of Collateral Token to be transferred /// @param _borrower The borrower account for which the collateral should be credited function _addCollateral(address _sender, uint256 _collateralAmount, address _borrower) internal { // Effects: write to state userCollateralBalance[_borrower] += _collateralAmount; totalCollateral += _collateralAmount; // Interactions if (_sender != address(this)) { collateralContract.safeTransferFrom(_sender, address(this), _collateralAmount); } emit AddCollateral(_sender, _borrower, _collateralAmount); } /// @notice The ```addCollateral``` function allows the caller to add Collateral Token to a borrowers position /// @dev msg.sender must call ERC20.approve() on the Collateral Token contract prior to invocation /// @param _collateralAmount The amount of Collateral Token to be added to borrower's position /// @param _borrower The account to be credited function addCollateral(uint256 _collateralAmount, address _borrower) external nonReentrant { if (_borrower == address(0)) revert InvalidReceiver(); _addInterest(); _addCollateral(msg.sender, _collateralAmount, _borrower); } /// @notice The ```RemoveCollateral``` event is emitted when collateral is removed from a borrower's position /// @param _sender The account from which funds are transferred /// @param _collateralAmount The amount of Collateral Token to be transferred /// @param _receiver The address to which Collateral Tokens will be transferred event RemoveCollateral( address indexed _sender, uint256 _collateralAmount, address indexed _receiver, address indexed _borrower ); /// @notice The ```_removeCollateral``` function is the internal implementation for removing collateral from a borrower's position /// @param _collateralAmount The amount of Collateral Token to remove from the borrower's position /// @param _receiver The address to receive the Collateral Token transferred /// @param _borrower The borrower whose account will be debited the Collateral amount function _removeCollateral(uint256 _collateralAmount, address _receiver, address _borrower) internal { // Effects: write to state // NOTE: Following line will revert on underflow if _collateralAmount > userCollateralBalance userCollateralBalance[_borrower] -= _collateralAmount; // NOTE: Following line will revert on underflow if totalCollateral < _collateralAmount totalCollateral -= _collateralAmount; // Interactions if (_receiver != address(this)) { collateralContract.safeTransfer(_receiver, _collateralAmount); } emit RemoveCollateral(msg.sender, _collateralAmount, _receiver, _borrower); } /// @notice The ```removeCollateral``` function is used to remove collateral from msg.sender's borrow position /// @dev msg.sender must be solvent after invocation or transaction will revert /// @param _collateralAmount The amount of Collateral Token to transfer /// @param _receiver The address to receive the transferred funds function removeCollateral( uint256 _collateralAmount, address _receiver ) external nonReentrant isSolvent(msg.sender) { if (_receiver == address(0)) revert InvalidReceiver(); _addInterest(); // Note: exchange rate is irrelevant when borrower has no debt shares if (userBorrowShares[msg.sender] > 0) { (bool _isBorrowAllowed, , ) = _updateExchangeRate(); if (!_isBorrowAllowed) revert ExceedsMaxOracleDeviation(); } _removeCollateral(_collateralAmount, _receiver, msg.sender); } /// @notice The ```SetWhitelistedDelegators``` event is emitted when admin enable/disable delegator who can call removeCollateralFrom() /// @param _delegator the address of contract who can call the removeCollateralFrom() /// @param _enabled the enable/disable flag. event SetWhitelistedDelegators( address indexed _delegator, bool _enabled ); /// @notice The ```setWhitelistedDelegators``` function enable/disable the delegators who can call the removeCollateralFrom() /// @param _delegator the address of contract who can call the removeCollateralFrom() /// @param _enabled the enable/disable flag. function setWhitelistedDelegators(address _delegator, bool _enabled) external payable onlyOwner { whitelistedDelegators[_delegator] = _enabled; emit SetWhitelistedDelegators(_delegator, _enabled); } /// @notice The ```removeCollateralFrom``` function is used to remove collateral from the borrower /// @dev caller must be delegator(ex: leverage contract) and borrower must be solvent after invocation or transaction will revert /// @param _collateralAmount The amount of Collateral Token to transfer /// @param _receiver The address to receive the transferred funds /// @param _borrower The address removing collateral from function removeCollateralFrom( uint256 _collateralAmount, address _receiver, address _borrower ) external payable nonReentrant isSolvent(_borrower) { if(whitelistedDelegators[msg.sender] == false) revert InvalidDelegator(); if (_receiver == address(0)) revert InvalidReceiver(); if (_borrower == address(0)) revert InvalidBorrower(); _addInterest(); // Note: exchange rate is irrelevant when borrower has no debt shares if (userBorrowShares[_borrower] > 0) { (bool _isBorrowAllowed, , ) = _updateExchangeRate(); if (!_isBorrowAllowed) revert ExceedsMaxOracleDeviation(); } _removeCollateral(_collateralAmount, _receiver, _borrower); } /// @notice The ```RepayAsset``` event is emitted whenever a debt position is repaid /// @param payer The address paying for the repayment /// @param borrower The borrower whose account will be credited /// @param amountToRepay The amount of Asset token to be transferred /// @param shares The amount of Borrow Shares which will be debited from the borrower after repayment event RepayAsset(address indexed payer, address indexed borrower, uint256 amountToRepay, uint256 shares); /// @notice The ```_repayAsset``` function is the internal implementation for repaying a borrow position /// @dev The payer must have called ERC20.approve() on the Asset Token contract prior to invocation /// @param _totalBorrow An in memory copy of the totalBorrow VaultAccount struct /// @param _amountToRepay The amount of Asset Token to transfer /// @param _shares The number of Borrow Shares the sender is repaying /// @param _payer The address from which funds will be transferred /// @param _borrower The borrower account which will be credited function _repayAsset( VaultAccount memory _totalBorrow, uint128 _amountToRepay, uint128 _shares, address _payer, address _borrower ) internal { // Effects: Bookkeeping _totalBorrow.amount -= _amountToRepay; _totalBorrow.shares -= _shares; // Effects: write to state userBorrowShares[_borrower] -= _shares; totalBorrow = _totalBorrow; // Interactions if (_payer != address(this)) { assetContract.safeTransferFrom(_payer, address(this), _amountToRepay); } emit RepayAsset(_payer, _borrower, _amountToRepay, _shares); } /// @notice The ```repayAsset``` function allows the caller to pay down the debt for a given borrower. /// @dev Caller must first invoke ```ERC20.approve()``` for the Asset Token contract /// @param _shares The number of Borrow Shares which will be repaid by the call /// @param _borrower The account for which the debt will be reduced /// @return _amountToRepay The amount of Asset Tokens which were transferred in order to repay the Borrow Shares function repayAsset(uint256 _shares, address _borrower) external nonReentrant returns (uint256 _amountToRepay) { if (_borrower == address(0)) revert InvalidReceiver(); // Check if repay is paused revert if necessary if (isRepayPaused) revert RepayPaused(); // Accrue interest if necessary _addInterest(); // Calculate amount to repay based on shares VaultAccount memory _totalBorrow = totalBorrow; _amountToRepay = _totalBorrow.toAmount(_shares, true); // Execute repayment effects _repayAsset(_totalBorrow, _amountToRepay.toUint128(), _shares.toUint128(), msg.sender, _borrower); } // ============================================================================================ // Functions: Liquidations // ============================================================================================ /// @notice The ```Liquidate``` event is emitted when a liquidation occurs /// @param _borrower The borrower account for which the liquidation occurred /// @param _collateralForLiquidator The amount of Collateral Token transferred to the liquidator /// @param _sharesToLiquidate The number of Borrow Shares the liquidator repaid on behalf of the borrower /// @param _sharesToAdjust The number of Borrow Shares that were adjusted on liabilities and assets (a writeoff) event Liquidate( address indexed _borrower, uint256 _collateralForLiquidator, uint256 _sharesToLiquidate, uint256 _amountLiquidatorToRepay, uint256 _feesAmount, uint256 _sharesToAdjust, uint256 _amountToAdjust ); /// @notice The ```liquidate``` function allows a third party to repay a borrower's debt if they have become insolvent /// @dev Caller must invoke ```ERC20.approve``` on the Asset Token contract prior to calling ```Liquidate()``` /// @param _sharesToLiquidate The number of Borrow Shares repaid by the liquidator /// @param _deadline The timestamp after which tx will revert /// @param _borrower The account for which the repayment is credited and from whom collateral will be taken /// @return _collateralForLiquidator The amount of Collateral Token transferred to the liquidator function liquidate( uint128 _sharesToLiquidate, uint256 _deadline, address _borrower ) external nonReentrant returns (uint256 _collateralForLiquidator) { if (_borrower == address(0)) revert InvalidReceiver(); // Check if liquidate is paused revert if necessary if (isLiquidatePaused) revert LiquidatePaused(); // Ensure deadline has not passed if (block.timestamp > _deadline) revert PastDeadline(block.timestamp, _deadline); // accrue interest if necessary _addInterest(); // Update exchange rate and use the lower rate for liquidations (, uint256 _exchangeRate, ) = _updateExchangeRate(); // Check if borrower is solvent, revert if they are if (_isSolvent(_borrower, _exchangeRate)) { revert BorrowerSolvent(); } // Read from state VaultAccount memory _totalBorrow = totalBorrow; uint256 _userCollateralBalance = userCollateralBalance[_borrower]; uint128 _borrowerShares = userBorrowShares[_borrower].toUint128(); // Prevent stack-too-deep int256 _leftoverCollateral; uint256 _feesAmount; { // Checks & Calculations // Determine the liquidation amount in collateral units (i.e. how much debt liquidator is going to repay) uint256 _liquidationAmountInCollateralUnits = ((_totalBorrow.toAmount(_sharesToLiquidate, false) * _exchangeRate) / EXCHANGE_PRECISION); // We first optimistically calculate the amount of collateral to give the liquidator based on the higher clean liquidation fee // This fee only applies if the liquidator does a full liquidation uint256 _optimisticCollateralForLiquidator = (_liquidationAmountInCollateralUnits * (LIQ_PRECISION + cleanLiquidationFee)) / LIQ_PRECISION; // Because interest accrues every block, _liquidationAmountInCollateralUnits from a few lines up is an ever increasing value // This means that leftoverCollateral can occasionally go negative by a few hundred wei (cleanLiqFee premium covers this for liquidator) _leftoverCollateral = (_userCollateralBalance.toInt256() - _optimisticCollateralForLiquidator.toInt256()); // If cleanLiquidation fee results in no leftover collateral, give liquidator all the collateral // This will only be true when there liquidator is cleaning out the position _collateralForLiquidator = _leftoverCollateral <= 0 ? _userCollateralBalance : (_liquidationAmountInCollateralUnits * (LIQ_PRECISION + dirtyLiquidationFee)) / LIQ_PRECISION; if (protocolLiquidationFee > 0) { _feesAmount = (protocolLiquidationFee * _collateralForLiquidator) / LIQ_PRECISION; _collateralForLiquidator = _collateralForLiquidator - _feesAmount; } } // Calculated here for use during repayment, grouped with other calcs before effects start uint128 _amountLiquidatorToRepay = (_totalBorrow.toAmount(_sharesToLiquidate, true)).toUint128(); // Determine if and how much debt to adjust uint128 _sharesToAdjust = 0; { uint128 _amountToAdjust = 0; if (_leftoverCollateral <= 0) { // Determine if we need to adjust any shares _sharesToAdjust = _borrowerShares - _sharesToLiquidate; if (_sharesToAdjust > 0) { // Write off bad debt _amountToAdjust = (_totalBorrow.toAmount(_sharesToAdjust, false)).toUint128(); // Note: Ensure this memory struct will be passed to _repayAsset for write to state _totalBorrow.amount -= _amountToAdjust; // Effects: write to state totalAsset.amount -= _amountToAdjust; } } emit Liquidate( _borrower, _collateralForLiquidator, _sharesToLiquidate, _amountLiquidatorToRepay, _feesAmount, _sharesToAdjust, _amountToAdjust ); } // Effects & Interactions // NOTE: reverts if _shares > userBorrowShares _repayAsset( _totalBorrow, _amountLiquidatorToRepay, _sharesToLiquidate + _sharesToAdjust, msg.sender, _borrower ); // liquidator repays shares on behalf of borrower // NOTE: reverts if _collateralForLiquidator > userCollateralBalance // Collateral is removed on behalf of borrower and sent to liquidator // NOTE: reverts if _collateralForLiquidator > userCollateralBalance _removeCollateral(_collateralForLiquidator, msg.sender, _borrower); // Adjust bookkeeping only (decreases collateral held by borrower) _removeCollateral(_feesAmount, address(this), _borrower); // Adjusts bookkeeping only (increases collateral held by protocol) _addCollateral(address(this), _feesAmount, address(this)); } // ============================================================================================ // Functions: Leverage // ============================================================================================ /// @notice The ```RepayAssetWithCollateral``` event is emitted whenever ```repayAssetWithCollateral()``` is invoked /// @param _borrower The borrower account for which the repayment is taking place /// @param _swapperAddress The address of the whitelisted swapper to use for token swaps /// @param _collateralToSwap The amount of Collateral Token to swap and use for repayment /// @param _amountAssetOut The amount of Asset Token which was repaid /// @param _sharesRepaid The number of Borrow Shares which were repaid event RepayAssetWithCollateral( address indexed _borrower, address _swapperAddress, uint256 _collateralToSwap, uint256 _amountAssetOut, uint256 _sharesRepaid ); /// @notice The ```repayAssetWithCollateral``` function allows a borrower to repay their debt using existing collateral in contract /// @param _swapperAddress The address of the whitelisted swapper to use for token swaps /// @param _collateralToSwap The amount of Collateral Tokens to swap for Asset Tokens /// @param _amountAssetOutMin The minimum amount of Asset Tokens to receive during the swap /// @param _path An array containing the addresses of ERC20 tokens to swap. Adheres to UniV2 style path params. /// @return _amountAssetOut The amount of Asset Tokens received for the Collateral Tokens, the amount the borrowers account was credited function repayAssetWithCollateral( address _swapperAddress, uint256 _collateralToSwap, uint256 _amountAssetOutMin, address[] calldata _path ) external nonReentrant isSolvent(msg.sender) returns (uint256 _amountAssetOut) { // Accrue interest if necessary _addInterest(); // Update exchange rate and check if borrow is allowed, revert if not (bool _isBorrowAllowed, , ) = _updateExchangeRate(); if (!_isBorrowAllowed) revert ExceedsMaxOracleDeviation(); IERC20 _assetContract = assetContract; IERC20 _collateralContract = collateralContract; if (!swappers[_swapperAddress]) { revert BadSwapper(); } if (_path[0] != address(_collateralContract)) { revert InvalidPath(address(_collateralContract), _path[0]); } if (_path[_path.length - 1] != address(_assetContract)) { revert InvalidPath(address(_assetContract), _path[_path.length - 1]); } // Effects: bookkeeping & write to state // Debit users collateral balance in preparation for swap, setting _recipient to address(this) means no transfer occurs _removeCollateral(_collateralToSwap, address(this), msg.sender); // Interactions _collateralContract.approve(_swapperAddress, _collateralToSwap); // Even though swappers are trusted, we verify the balance before and after swap uint256 _initialAssetBalance = _assetContract.balanceOf(address(this)); ISwapper(_swapperAddress).swapExactTokensForTokens( _collateralToSwap, _amountAssetOutMin, _path, address(this), block.timestamp ); uint256 _finalAssetBalance = _assetContract.balanceOf(address(this)); // Note: VIOLATES CHECKS-EFFECTS-INTERACTION pattern, make sure function is NONREENTRANT // Effects: bookkeeping _amountAssetOut = _finalAssetBalance - _initialAssetBalance; if (_amountAssetOut < _amountAssetOutMin) { revert SlippageTooHigh(_amountAssetOutMin, _amountAssetOut); } VaultAccount memory _totalBorrow = totalBorrow; uint256 _sharesToRepay = _totalBorrow.toShares(_amountAssetOut, false); // Effects: write to state // Note: setting _payer to address(this) means no actual transfer will occur. Contract already has funds _repayAsset(_totalBorrow, _amountAssetOut.toUint128(), _sharesToRepay.toUint128(), address(this), msg.sender); emit RepayAssetWithCollateral(msg.sender, _swapperAddress, _collateralToSwap, _amountAssetOut, _sharesToRepay); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @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]. */ 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; constructor() { _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 making it call a * `private` function that does the actual work. */ modifier nonReentrant() { _nonReentrantBefore(); _; _nonReentrantAfter(); } function _nonReentrantBefore() private { // On the first call to nonReentrant, _status will be _NOT_ENTERED require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; } function _nonReentrantAfter() private { // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } /** * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a * `nonReentrant` function in the call stack. */ function _reentrancyGuardEntered() internal view returns (bool) { return _status == _ENTERED; } }
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; // ==================== SturdyPairAccessControl ===================== import { Ownable2Step, Ownable } from "@openzeppelin/contracts/access/Ownable2Step.sol"; import { Timelock2Step } from "./Timelock2Step.sol"; import { SturdyPairAccessControlErrors } from "./SturdyPairAccessControlErrors.sol"; /// @title SturdyPairAccessControl /// @author Drake Evans (Frax Finance) https://github.com/drakeevans /// @notice An abstract contract which contains the access control logic for SturdyPair abstract contract SturdyPairAccessControl is Timelock2Step, Ownable2Step, SturdyPairAccessControlErrors { // Deployer address public immutable DEPLOYER_ADDRESS; // Admin contracts address public circuitBreakerAddress; // access control uint256 public borrowLimit = type(uint256).max; uint256 public depositLimit = type(uint256).max; bool public isRepayPaused; bool public isRepayAccessControlRevoked; bool public isWithdrawPaused; bool public isWithdrawAccessControlRevoked; bool public isLiquidatePaused; bool public isLiquidateAccessControlRevoked; bool public isInterestPaused; /// @param _immutables abi.encode(address _circuitBreakerAddress, address _comptrollerAddress, address _timelockAddress) constructor(bytes memory _immutables) Timelock2Step() Ownable2Step() { // Handle Immutables Configuration (address _circuitBreakerAddress, address _comptrollerAddress, address _timelockAddress) = abi.decode( _immutables, (address, address, address) ); _setTimelock(_timelockAddress); _transferOwnership(_comptrollerAddress); // Deployer contract DEPLOYER_ADDRESS = msg.sender; circuitBreakerAddress = _circuitBreakerAddress; } // ============================================================================================ // Functions: Access Control // ============================================================================================ function _requireProtocolOrOwner() internal view { if ( msg.sender != circuitBreakerAddress && msg.sender != owner() && msg.sender != DEPLOYER_ADDRESS && msg.sender != timelockAddress ) { revert OnlyProtocolOrOwner(); } } function _requireTimelockOrOwner() internal view { if (msg.sender != owner() && msg.sender != timelockAddress) { revert OnlyTimelockOrOwner(); } } /// @notice The ```SetBorrowLimit``` event is emitted when the borrow limit is set /// @param limit The new borrow limit event SetBorrowLimit(uint256 limit); function _setBorrowLimit(uint256 _limit) internal { borrowLimit = _limit; emit SetBorrowLimit(_limit); } /// @notice The ```SetDepositLimit``` event is emitted when the deposit limit is set /// @param limit The new deposit limit event SetDepositLimit(uint256 limit); function _setDepositLimit(uint256 _limit) internal { depositLimit = _limit; emit SetDepositLimit(_limit); } /// @notice The ```RevokeRepayAccessControl``` event is emitted when repay access control is revoked event RevokeRepayAccessControl(); function _revokeRepayAccessControl() internal { isRepayAccessControlRevoked = true; emit RevokeRepayAccessControl(); } /// @notice The ```PauseRepay``` event is emitted when repay is paused or unpaused /// @param isPaused The new paused state event PauseRepay(bool isPaused); function _pauseRepay(bool _isPaused) internal { isRepayPaused = _isPaused; emit PauseRepay(_isPaused); } /// @notice The ```RevokeWithdrawAccessControl``` event is emitted when withdraw access control is revoked event RevokeWithdrawAccessControl(); function _revokeWithdrawAccessControl() internal { isWithdrawAccessControlRevoked = true; emit RevokeWithdrawAccessControl(); } /// @notice The ```PauseWithdraw``` event is emitted when withdraw is paused or unpaused /// @param isPaused The new paused state event PauseWithdraw(bool isPaused); function _pauseWithdraw(bool _isPaused) internal { isWithdrawPaused = _isPaused; emit PauseWithdraw(_isPaused); } /// @notice The ```RevokeLiquidateAccessControl``` event is emitted when liquidate access control is revoked event RevokeLiquidateAccessControl(); function _revokeLiquidateAccessControl() internal { isLiquidateAccessControlRevoked = true; emit RevokeLiquidateAccessControl(); } /// @notice The ```PauseLiquidate``` event is emitted when liquidate is paused or unpaused /// @param isPaused The new paused state event PauseLiquidate(bool isPaused); function _pauseLiquidate(bool _isPaused) internal { isLiquidatePaused = _isPaused; emit PauseLiquidate(_isPaused); } /// @notice The ```PauseInterest``` event is emitted when interest is paused or unpaused /// @param isPaused The new paused state event PauseInterest(bool isPaused); function _pauseInterest(bool _isPaused) internal { isInterestPaused = _isPaused; emit PauseInterest(_isPaused); } /// @notice The ```SetCircuitBreaker``` event is emitted when the circuit breaker address is set /// @param oldCircuitBreaker The old circuit breaker address /// @param newCircuitBreaker The new circuit breaker address event SetCircuitBreaker(address oldCircuitBreaker, address newCircuitBreaker); /// @notice The ```_setCircuitBreaker``` function is called to set the circuit breaker address /// @param _newCircuitBreaker The new circuit breaker address function _setCircuitBreaker(address _newCircuitBreaker) internal { address oldCircuitBreaker = circuitBreakerAddress; circuitBreakerAddress = _newCircuitBreaker; emit SetCircuitBreaker(oldCircuitBreaker, _newCircuitBreaker); } /// @notice The ```setCircuitBreaker``` function is called to set the circuit breaker address /// @param _newCircuitBreaker The new circuit breaker address function setCircuitBreaker(address _newCircuitBreaker) external virtual { _requireTimelock(); _setCircuitBreaker(_newCircuitBreaker); } }
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; // ===================== SturdyPairConstants ======================== /// @title SturdyPairConstants /// @author Drake Evans (Frax Finance) https://github.com/drakeevans /// @notice An abstract contract which contains the errors and constants for the SturdyPair contract abstract contract SturdyPairConstants { // ============================================================================================ // Constants // ============================================================================================ // Precision settings uint256 internal constant LTV_PRECISION = 1e5; // 5 decimals uint256 internal constant LIQ_PRECISION = 1e5; uint256 internal constant UTIL_PREC = 1e5; uint256 internal constant FEE_PRECISION = 1e5; uint256 internal constant EXCHANGE_PRECISION = 1e18; uint256 internal constant DEVIATION_PRECISION = 1e5; uint256 internal constant RATE_PRECISION = 1e18; // Protocol Fee uint256 internal constant MAX_PROTOCOL_FEE = 5e4; // 50% 1e5 precision error Insolvent(uint256 _borrow, uint256 _collateral, uint256 _exchangeRate); error BorrowerSolvent(); error InsufficientAssetsInContract(uint256 _assets, uint256 _request); error SlippageTooHigh(uint256 _minOut, uint256 _actual); error BadSwapper(); error InvalidPath(address _expected, address _actual); error BadProtocolFee(); error PastDeadline(uint256 _blockTimestamp, uint256 _deadline); error SetterRevoked(); error ExceedsMaxOracleDeviation(); error InvalidReceiver(); error InvalidOnBehalfOf(); error InvalidApproveBorrowDelegation(); error InvalidBorrower(); error InvalidDelegator(); }
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; struct VaultAccount { uint128 amount; // Total amount, analogous to market cap uint128 shares; // Total shares, analogous to shares outstanding } /// @title VaultAccount Library /// @author Drake Evans (Frax Finance) github.com/drakeevans, modified from work by @Boring_Crypto github.com/boring_crypto /// @notice Provides a library for use with the VaultAccount struct, provides convenient math implementations /// @dev Uses uint128 to save on storage library VaultAccountingLibrary { /// @notice Calculates the shares value in relationship to `amount` and `total` /// @dev Given an amount, return the appropriate number of shares function toShares(VaultAccount memory total, uint256 amount, bool roundUp) internal pure returns (uint256 shares) { if (total.amount == 0) { shares = amount; } else { shares = (amount * total.shares) / total.amount; if (roundUp && (shares * total.amount) / total.shares < amount) { shares = shares + 1; } } } /// @notice Calculates the amount value in relationship to `shares` and `total` /// @dev Given a number of shares, returns the appropriate amount function toAmount(VaultAccount memory total, uint256 shares, bool roundUp) internal pure returns (uint256 amount) { if (total.shares == 0) { amount = shares; } else { amount = (shares * total.amount) / total.shares; if (roundUp && (amount * total.shares) / total.amount < shares) { amount = amount + 1; } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/IERC20Permit.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 Address for address; /** * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } /** * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful. */ 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' 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)); } /** * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 oldAllowance = token.allowance(address(this), spender); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value)); } /** * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value)); } } /** * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval * to be set to zero before setting it to a non-zero value, such as USDT. */ function forceApprove(IERC20 token, address spender, uint256 value) internal { bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value); if (!_callOptionalReturnBool(token, approvalCall)) { _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0)); _callOptionalReturn(token, approvalCall); } } /** * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`. * Revert on invalid signature. */ function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @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"); require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } /** * @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). * * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead. */ function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) { // 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 cannot use {Address-functionCall} here since this should return false // and not revert is the subcall reverts. (bool success, bytes memory returndata) = address(token).call(data); return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol) pragma solidity ^0.8.0; import "../token/ERC20/IERC20.sol";
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; import { IERC20 } from "@openzeppelin/contracts/interfaces/IERC20.sol"; import { SafeERC20 as OZSafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; // solhint-disable avoid-low-level-calls // solhint-disable max-line-length /// @title SafeERC20 provides helper functions for safe transfers as well as safe metadata access /// @author Library originally written by @Boring_Crypto github.com/boring_crypto, modified by Drake Evans (Frax Finance) github.com/drakeevans /// @dev original: https://github.com/boringcrypto/BoringSolidity/blob/fed25c5d43cb7ce20764cd0b838e21a02ea162e9/contracts/libraries/BoringERC20.sol library SafeERC20 { bytes4 private constant SIG_SYMBOL = 0x95d89b41; // symbol() bytes4 private constant SIG_NAME = 0x06fdde03; // name() bytes4 private constant SIG_DECIMALS = 0x313ce567; // decimals() function returnDataToString(bytes memory data) internal pure returns (string memory) { if (data.length >= 64) { return abi.decode(data, (string)); } else if (data.length == 32) { uint8 i = 0; while (i < 32 && data[i] != 0) { i++; } bytes memory bytesArray = new bytes(i); for (i = 0; i < 32 && data[i] != 0; i++) { bytesArray[i] = data[i]; } return string(bytesArray); } else { return "???"; } } /// @notice Provides a safe ERC20.symbol version which returns '???' as fallback string. /// @param token The address of the ERC-20 token contract. /// @return (string) Token symbol. function safeSymbol(IERC20 token) internal view returns (string memory) { (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(SIG_SYMBOL)); return success ? returnDataToString(data) : "???"; } /// @notice Provides a safe ERC20.name version which returns '???' as fallback string. /// @param token The address of the ERC-20 token contract. /// @return (string) Token name. function safeName(IERC20 token) internal view returns (string memory) { (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(SIG_NAME)); return success ? returnDataToString(data) : "???"; } /// @notice Provides a safe ERC20.decimals version which returns '18' as fallback value. /// @param token The address of the ERC-20 token contract. /// @return (uint8) Token decimals. function safeDecimals(IERC20 token) internal view returns (uint8) { (bool success, bytes memory data) = address(token).staticcall(abi.encodeWithSelector(SIG_DECIMALS)); return success && data.length == 32 ? abi.decode(data, (uint8)) : 18; } function safeTransfer(IERC20 token, address to, uint256 value) internal { OZSafeERC20.safeTransfer(token, to, value); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { OZSafeERC20.safeTransferFrom(token, from, to, value); } }
// SPDX-License-Identifier: UNLICENSED pragma solidity 0.8.21; import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol"; interface IDualOracle is IERC165 { function ORACLE_PRECISION() external view returns (uint256); function BASE_TOKEN_0() external view returns (address); function BASE_TOKEN_0_DECIMALS() external view returns (uint256); function BASE_TOKEN_1() external view returns (address); function BASE_TOKEN_1_DECIMALS() external view returns (uint256); function decimals() external view returns (uint8); function getPricesNormalized() external view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh); function getPrices() external view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh); function name() external view returns (string memory); function NORMALIZATION_0() external view returns (int256); function NORMALIZATION_1() external view returns (int256); function QUOTE_TOKEN_0() external view returns (address); function QUOTE_TOKEN_0_DECIMALS() external view returns (uint256); function QUOTE_TOKEN_1() external view returns (address); function QUOTE_TOKEN_1_DECIMALS() external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity >=0.8.21; interface ISwapper { function swapExactTokensForTokens( uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline ) external returns (uint256[] memory amounts); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol) pragma solidity ^0.8.0; import "./Ownable.sol"; /** * @dev Contract module which provides 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 {transferOwnership} and {acceptOwnership}. * * This module is used through inheritance. It will make available all functions * from parent (Ownable). */ abstract contract Ownable2Step is Ownable { address private _pendingOwner; event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner); /** * @dev Returns the address of the pending owner. */ function pendingOwner() public view virtual returns (address) { return _pendingOwner; } /** * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one. * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual override onlyOwner { _pendingOwner = newOwner; emit OwnershipTransferStarted(owner(), newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner. * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual override { delete _pendingOwner; super._transferOwnership(newOwner); } /** * @dev The new owner accepts the ownership transfer. */ function acceptOwnership() public virtual { address sender = _msgSender(); require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner"); _transferOwnership(sender); } }
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; // ========================== Timelock2Step =========================== /// @title Timelock2Step /// @author Drake Evans (Frax Finance) https://github.com/drakeevans /// @dev Inspired by the OpenZeppelin's Ownable2Step contract /// @notice An abstract contract which contains 2-step transfer and renounce logic for a timelock address abstract contract Timelock2Step { /// @notice The pending timelock address address public pendingTimelockAddress; /// @notice The current timelock address address public timelockAddress; constructor() { timelockAddress = msg.sender; } /// @notice Emitted when timelock is transferred error OnlyTimelock(); /// @notice Emitted when pending timelock is transferred error OnlyPendingTimelock(); /// @notice The ```TimelockTransferStarted``` event is emitted when the timelock transfer is initiated /// @param previousTimelock The address of the previous timelock /// @param newTimelock The address of the new timelock event TimelockTransferStarted(address indexed previousTimelock, address indexed newTimelock); /// @notice The ```TimelockTransferred``` event is emitted when the timelock transfer is completed /// @param previousTimelock The address of the previous timelock /// @param newTimelock The address of the new timelock event TimelockTransferred(address indexed previousTimelock, address indexed newTimelock); /// @notice The ```_isSenderTimelock``` function checks if msg.sender is current timelock address /// @return Whether or not msg.sender is current timelock address function _isSenderTimelock() internal view returns (bool) { return msg.sender == timelockAddress; } /// @notice The ```_requireTimelock``` function reverts if msg.sender is not current timelock address function _requireTimelock() internal view { if (msg.sender != timelockAddress) revert OnlyTimelock(); } /// @notice The ```_isSenderPendingTimelock``` function checks if msg.sender is pending timelock address /// @return Whether or not msg.sender is pending timelock address function _isSenderPendingTimelock() internal view returns (bool) { return msg.sender == pendingTimelockAddress; } /// @notice The ```_requirePendingTimelock``` function reverts if msg.sender is not pending timelock address function _requirePendingTimelock() internal view { if (msg.sender != pendingTimelockAddress) revert OnlyPendingTimelock(); } /// @notice The ```_transferTimelock``` function initiates the timelock transfer /// @dev This function is to be implemented by a public function /// @param _newTimelock The address of the nominated (pending) timelock function _transferTimelock(address _newTimelock) internal { pendingTimelockAddress = _newTimelock; emit TimelockTransferStarted(timelockAddress, _newTimelock); } /// @notice The ```_acceptTransferTimelock``` function completes the timelock transfer /// @dev This function is to be implemented by a public function function _acceptTransferTimelock() internal { pendingTimelockAddress = address(0); _setTimelock(msg.sender); } /// @notice The ```_setTimelock``` function sets the timelock address /// @dev This function is to be implemented by a public function /// @param _newTimelock The address of the new timelock function _setTimelock(address _newTimelock) internal { emit TimelockTransferred(timelockAddress, _newTimelock); timelockAddress = _newTimelock; } /// @notice The ```transferTimelock``` function initiates the timelock transfer /// @dev Must be called by the current timelock /// @param _newTimelock The address of the nominated (pending) timelock function transferTimelock(address _newTimelock) external virtual { _requireTimelock(); _transferTimelock(_newTimelock); } /// @notice The ```acceptTransferTimelock``` function completes the timelock transfer /// @dev Must be called by the pending timelock function acceptTransferTimelock() external virtual { _requirePendingTimelock(); _acceptTransferTimelock(); } /// @notice The ```renounceTimelock``` function renounces the timelock after setting pending timelock to current timelock /// @dev Pending timelock must be set to current timelock before renouncing, creating a 2-step renounce process function renounceTimelock() external virtual { _requireTimelock(); _requirePendingTimelock(); _transferTimelock(address(0)); _setTimelock(address(0)); } }
// SPDX-License-Identifier: AGPL-3.0 pragma solidity ^0.8.21; import { VaultAccount } from "../libraries/VaultAccount.sol"; interface ISturdyPair { struct CurrentRateInfo { uint32 lastBlock; uint32 feeToProtocolRate; // Fee amount 1e5 precision uint64 lastTimestamp; uint64 ratePerSec; uint64 fullUtilizationRate; } function CIRCUIT_BREAKER_ADDRESS() external view returns (address); function COMPTROLLER_ADDRESS() external view returns (address); function DEPLOYER_ADDRESS() external view returns (address); function FRAXLEND_WHITELIST_ADDRESS() external view returns (address); function timelockAddress() external view returns (address); function addCollateral(uint256 _collateralAmount, address _borrower) external; function addInterest( bool _returnAccounting ) external returns ( uint256 _interestEarned, uint256 _feesAmount, uint256 _feesShare, CurrentRateInfo memory _currentRateInfo, VaultAccount memory _totalAsset, VaultAccount memory _totalBorrow ); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 amount) external returns (bool); function approvedBorrowers(address) external view returns (bool); function approvedLenders(address) external view returns (bool); function approveBorrowDelegation(address _delegatee, uint256 _amount) external; function asset() external view returns (address); function balanceOf(address account) external view returns (uint256); function borrowAsset( uint256 _borrowAmount, uint256 _collateralAmount, address _receiver ) external returns (uint256 _shares); function borrowAssetOnBehalfOf( uint256 _borrowAmount, address _onBehalfOf ) external returns (uint256 _shares); function borrowerWhitelistActive() external view returns (bool); function changeFee(uint32 _newFee) external; function cleanLiquidationFee() external view returns (uint256); function collateralContract() external view returns (address); function currentRateInfo() external view returns ( uint32 lastBlock, uint32 feeToProtocolRate, uint64 lastTimestamp, uint64 ratePerSec, uint64 fullUtilizationRate ); function decimals() external view returns (uint8); function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool); function deposit(uint256 _amount, address _receiver) external returns (uint256 _sharesReceived); function dirtyLiquidationFee() external view returns (uint256); function exchangeRateInfo() external view returns (address oracle, uint32 maxOracleDeviation, uint184 lastTimestamp, uint256 lowExchangeRate, uint256 highExchangeRate); function getConstants() external pure returns ( uint256 _LTV_PRECISION, uint256 _LIQ_PRECISION, uint256 _UTIL_PREC, uint256 _FEE_PRECISION, uint256 _EXCHANGE_PRECISION, uint256 _DEVIATION_PRECISION, uint256 _RATE_PRECISION, uint256 _MAX_PROTOCOL_FEE ); function getImmutableAddressBool() external view returns ( address _assetContract, address _collateralContract, address _oracleMultiply, address _oracleDivide, address _rateContract, address _DEPLOYER_CONTRACT, address _COMPTROLLER_ADDRESS, address _FRAXLEND_WHITELIST, bool _borrowerWhitelistActive, bool _lenderWhitelistActive ); function getImmutableUint256() external view returns ( uint256 _oracleNormalization, uint256 _maxLTV, uint256 _cleanLiquidationFee, uint256 _maturityDate, uint256 _penaltyRate ); function getPairAccounting() external view returns ( uint128 _totalAssetAmount, uint128 _totalAssetShares, uint128 _totalBorrowAmount, uint128 _totalBorrowShares, uint256 _totalCollateral ); function getUserSnapshot( address _address ) external view returns (uint256 _userAssetShares, uint256 _userBorrowShares, uint256 _userCollateralBalance); function increaseAllowance(address spender, uint256 addedValue) external returns (bool); function lenderWhitelistActive() external view returns (bool); function leveragedPosition( address _swapperAddress, uint256 _borrowAmount, uint256 _initialCollateralAmount, uint256 _amountCollateralOutMin, address[] memory _path ) external returns (uint256 _totalCollateralBalance); function liquidate( uint128 _sharesToLiquidate, uint256 _deadline, address _borrower ) external returns (uint256 _collateralForLiquidator); function maturityDate() external view returns (uint256); function maxLTV() external view returns (uint256); function maxOracleDelay() external view returns (uint256); function name() external view returns (string memory); function oracleDivide() external view returns (address); function oracleMultiply() external view returns (address); function oracleNormalization() external view returns (uint256); function owner() external view returns (address); function pause() external; function paused() external view returns (bool); function penaltyRate() external view returns (uint256); function rateContract() external view returns (address); function redeem(uint256 _shares, address _receiver, address _owner) external returns (uint256 _amountToReturn); function removeCollateral(uint256 _collateralAmount, address _receiver) external; function removeCollateralFrom( uint256 _collateralAmount, address _receiver, address _borrower ) external; function setWhitelistedDelegators(address _delegator, bool _enabled) external; function renounceOwnership() external; function repayAsset(uint256 _shares, address _borrower) external returns (uint256 _amountToRepay); function repayAssetWithCollateral( address _swapperAddress, uint256 _collateralToSwap, uint256 _amountAssetOutMin, address[] memory _path ) external returns (uint256 _amountAssetOut); function setApprovedBorrowers(address[] memory _borrowers, bool _approval) external; function setApprovedLenders(address[] memory _lenders, bool _approval) external; function setMaxOracleDelay(uint256 _newDelay) external; function setSwapper(address _swapper, bool _approval) external; function setTimelock(address _newAddress) external; function swappers(address) external view returns (bool); function symbol() external view returns (string memory); function toAssetAmount( uint256 _shares, bool _roundUp, bool _previewInterest ) external view returns (uint256); function toAssetShares( uint256 _amount, bool _roundUp, bool _previewInterest ) external view returns (uint256); function toBorrowAmount( uint256 _shares, bool _roundUp, bool _previewInterest ) external view returns (uint256 _amount); function toBorrowShares( uint256 _amount, bool _roundUp, bool _previewInterest ) external view returns (uint256 _shares); function totalAsset() external view returns (uint128 amount, uint128 shares); function totalBorrow() external view returns (uint128 amount, uint128 shares); function totalCollateral() external view returns (uint256); function totalSupply() external view returns (uint256); function transfer(address to, uint256 amount) external returns (bool); function transferFrom(address from, address to, uint256 amount) external returns (bool); function transferOwnership(address newOwner) external; function unpause() external; function updateExchangeRate() external returns (bool _isBorrowAllowed, uint256 _lowExchangeRate, uint256 _highExchangeRate); function userBorrowShares(address) external view returns (uint256); function userCollateralBalance(address) external view returns (uint256); function version() external pure returns (uint256 _major, uint256 _minor, uint256 _patch); function withdrawFees(uint128 _shares, address _recipient) external returns (uint256 _amountToTransfer); function isInterestPaused() external view returns (bool); }
// SPDX-License-Identifier: ISC pragma solidity ^0.8.21; // ================ SturdyPairAccessControlErrors =================== /// @title SturdyPairAccessControlErrors /// @author Drake Evans (Frax Finance) https://github.com/drakeevans /// @notice An abstract contract which contains the errors for the Access Control contract abstract contract SturdyPairAccessControlErrors { error OnlyProtocolOrOwner(); error OnlyTimelockOrOwner(); error ExceedsBorrowLimit(); error AccessControlRevoked(); error RepayPaused(); error ExceedsDepositLimit(); error WithdrawPaused(); error LiquidatePaused(); error InterestPaused(); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @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 * * Furthermore, `isContract` will also return true if the target contract within * the same transaction is already scheduled for destruction by `SELFDESTRUCT`, * which only has an effect at the end of a transaction. * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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"); (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 functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // 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 /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) pragma solidity ^0.8.0; /** * @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: ISC pragma solidity ^0.8.21; interface IRateCalculatorV2 { function name() external view returns (string memory); function version() external view returns (uint256, uint256, uint256); function getNewRate( uint256 _deltaTime, uint256 _utilization, uint64 _maxInterest ) external view returns (uint64 _newRatePerSec, uint64 _newMaxInterest); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @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 {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby disabling any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @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 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) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
{ "viaIR": true, "optimizer": { "enabled": true, "runs": 1660 }, "evmVersion": "paris", "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "metadata": { "useLiteralContent": true } }
Contract Security Audit
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IRateCalculatorV2","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_owner","type":"address"}],"name":"redeem","outputs":[{"internalType":"uint256","name":"_amountToReturn","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_collateralAmount","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"}],"name":"removeCollateral","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_collateralAmount","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_borrower","type":"address"}],"name":"removeCollateralFrom","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceTimelock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"},{"internalType":"address","name":"_borrower","type":"address"}],"name":"repayAsset","outputs":[{"internalType":"uint256","name":"_amountToRepay","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_swapperAddress","type":"address"},{"internalType":"uint256","name":"_collateralToSwap","type":"uint256"},{"internalType":"uint256","name":"_amountAssetOutMin","type":"uint256"},{"internalType":"address[]","name":"_path","type":"address[]"}],"name":"repayAssetWithCollateral","outputs":[{"internalType":"uint256","name":"_amountAssetOut","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"revokeLiquidateAccessControl","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"revokeMaxLTVSetter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"revokeRepayAccessControl","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"revokeWithdrawAccessControl","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_limit","type":"uint256"}],"name":"setBorrowLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newCircuitBreaker","type":"address"}],"name":"setCircuitBreaker","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_limit","type":"uint256"}],"name":"setDepositLimit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newCleanLiquidationFee","type":"uint256"},{"internalType":"uint256","name":"_newDirtyLiquidationFee","type":"uint256"},{"internalType":"uint256","name":"_newProtocolLiquidationFee","type":"uint256"}],"name":"setLiquidationFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newMaxLTV","type":"uint256"}],"name":"setMaxLTV","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newOracle","type":"address"},{"internalType":"uint32","name":"_newMaxOracleDeviation","type":"uint32"}],"name":"setOracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newRateContract","type":"address"}],"name":"setRateContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_swapper","type":"address"},{"internalType":"bool","name":"_approval","type":"bool"}],"name":"setSwapper","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_delegator","type":"address"},{"internalType":"bool","name":"_enabled","type":"bool"}],"name":"setWhitelistedDelegators","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"swappers","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"timelockAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"},{"internalType":"bool","name":"_roundUp","type":"bool"},{"internalType":"bool","name":"_previewInterest","type":"bool"}],"name":"toAssetAmount","outputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bool","name":"_roundUp","type":"bool"},{"internalType":"bool","name":"_previewInterest","type":"bool"}],"name":"toAssetShares","outputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"},{"internalType":"bool","name":"_roundUp","type":"bool"},{"internalType":"bool","name":"_previewInterest","type":"bool"}],"name":"toBorrowAmount","outputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bool","name":"_roundUp","type":"bool"},{"internalType":"bool","name":"_previewInterest","type":"bool"}],"name":"toBorrowShares","outputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalAsset","outputs":[{"internalType":"uint128","name":"amount","type":"uint128"},{"internalType":"uint128","name":"shares","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalAssets","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalBorrow","outputs":[{"internalType":"uint128","name":"amount","type":"uint128"},{"internalType":"uint128","name":"shares","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalCollateral","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newTimelock","type":"address"}],"name":"transferTimelock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"updateExchangeRate","outputs":[{"internalType":"bool","name":"_isBorrowAllowed","type":"bool"},{"internalType":"uint256","name":"_lowExchangeRate","type":"uint256"},{"internalType":"uint256","name":"_highExchangeRate","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"userBorrowAllowances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userBorrowShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userCollateralBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"_major","type":"uint256"},{"internalType":"uint256","name":"_minor","type":"uint256"},{"internalType":"uint256","name":"_patch","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"whitelistedDelegators","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"address","name":"_owner","type":"address"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"_sharesToBurn","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint128","name":"_shares","type":"uint128"},{"internalType":"address","name":"_recipient","type":"address"}],"name":"withdrawFees","outputs":[{"internalType":"uint256","name":"_amountToTransfer","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Swarm Source
ipfs://b44a4cf0cc82bfb10e16be54cef4171545ce0dd9f626c3aeb5374de818ad0bb9
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