// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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
* ====
*
* [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://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(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/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;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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].
*
* 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}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* 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 value {ERC20} uses, unless this function is
* 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: ISC
pragma solidity ^0.8.18;
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ========================== FraxlendPair ============================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance
// Primary Author
// Drake Evans: https://github.com/DrakeEvans
// Reviewers
// Dennis: https://github.com/denett
// Sam Kazemian: https://github.com/samkazemian
// Travis Moore: https://github.com/FortisFortuna
// Jack Corddry: https://github.com/corddry
// Rich Gee: https://github.com/zer0blockchain
// ====================================================================
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./FraxlendPairConstants.sol";
import "./FraxlendPairCore.sol";
import "./libraries/VaultAccount.sol";
import "./interfaces/ISwapper.sol";
/// @title FraxlendPair
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @notice The FraxlendPair is a lending pair that allows users to engage in lending and borrowing activities
contract FraxlendPair is IERC20Metadata, FraxlendPairCore {
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
) FraxlendPairCore(_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 ? depositLimit : depositLimit - _totalAsset.amount;
}
function maxMint(address _receiver) external view returns (uint256 _maxShares) {
(, , , , VaultAccount memory _totalAsset, ) = previewAddInterest();
uint256 _maxDeposit = _totalAsset.amount < depositLimit ? depositLimit : 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
// ============================================================================================
bool public isOracleSetterRevoked;
/// @notice The ```RevokeOracleSetter``` event is emitted when the oracle setter is revoked
event RevokeOracleInfoSetter();
/// @notice The ```revokeOracleSetter``` function revokes the oracle setter
function revokeOracleInfoSetter() external {
_requireTimelock();
isOracleSetterRevoked = true;
emit RevokeOracleInfoSetter();
}
/// @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();
if (isOracleSetterRevoked) revert SetterRevoked();
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;
}
bool public isRateContractSetterRevoked;
/// @notice The ```RevokeRateContractSetter``` event is emitted when the rate contract setter is revoked
event RevokeRateContractSetter();
/// @notice The ```revokeRateContractSetter``` function revokes the rate contract setter
function revokeRateContractSetter() external {
_requireTimelock();
isRateContractSetterRevoked = true;
emit RevokeRateContractSetter();
}
/// @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();
if (isRateContractSetterRevoked) revert SetterRevoked();
emit SetRateContract(address(rateContract), _newRateContract);
rateContract = IRateCalculatorV2(_newRateContract);
}
bool public isLiquidationFeeSetterRevoked;
/// @notice The ```RevokeLiquidationFeeSetter``` event is emitted when the liquidation fee setter is revoked
event RevokeLiquidationFeeSetter();
/// @notice The ```revokeLiquidationFeeSetter``` function revokes the liquidation fee setter
function revokeLiquidationFeeSetter() external {
_requireTimelock();
isLiquidationFeeSetterRevoked = true;
emit RevokeLiquidationFeeSetter();
}
/// @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();
if (isLiquidationFeeSetterRevoked) revert SetterRevoked();
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();
if (!isBorrowAccessControlRevoked) _setBorrowLimit(0);
if (!isDepositAccessControlRevoked) _setDepositLimit(0);
if (!isRepayAccessControlRevoked) _pauseRepay(true);
if (!isWithdrawAccessControlRevoked) _pauseWithdraw(true);
if (!isLiquidateAccessControlRevoked) _pauseLiquidate(true);
if (!isInterestAccessControlRevoked) {
_addInterest();
_pauseInterest(true);
}
}
/// @notice The ```unpause``` function is called to unpause all contract functionality
function unpause() external {
_requireTimelockOrOwner();
if (!isBorrowAccessControlRevoked) _setBorrowLimit(type(uint256).max);
if (!isDepositAccessControlRevoked) _setDepositLimit(type(uint256).max);
if (!isRepayAccessControlRevoked) _pauseRepay(false);
if (!isWithdrawAccessControlRevoked) _pauseWithdraw(false);
if (!isLiquidateAccessControlRevoked) _pauseLiquidate(false);
if (!isInterestAccessControlRevoked) {
_addInterest();
_pauseInterest(false);
}
}
/// @notice The ```pauseBorrow``` function sets borrow limit to 0
function pauseBorrow() external {
_requireProtocolOrOwner();
if (isBorrowAccessControlRevoked) revert AccessControlRevoked();
_setBorrowLimit(0);
}
/// @notice The ```setBorrowLimit``` function sets the borrow limit
/// @param _limit The new borrow limit
function setBorrowLimit(uint256 _limit) external {
_requireTimelockOrOwner();
if (isBorrowAccessControlRevoked) revert AccessControlRevoked();
_setBorrowLimit(_limit);
}
/// @notice The ```revokeBorrowLimitAccessControl``` function revokes borrow limit access control
/// @param _borrowLimit The new borrow limit
function revokeBorrowLimitAccessControl(uint256 _borrowLimit) external {
_requireTimelock();
_revokeBorrowAccessControl(_borrowLimit);
}
/// @notice The ```pauseDeposit``` function pauses deposit functionality
function pauseDeposit() external {
_requireProtocolOrOwner();
if (isDepositAccessControlRevoked) revert AccessControlRevoked();
_setDepositLimit(0);
}
/// @notice The ```setDepositLimit``` function sets the deposit limit
/// @param _limit The new deposit limit
function setDepositLimit(uint256 _limit) external {
_requireTimelockOrOwner();
if (isDepositAccessControlRevoked) revert AccessControlRevoked();
_setDepositLimit(_limit);
}
/// @notice The ```revokeDepositLimitAccessControl``` function revokes deposit limit access control
/// @param _depositLimit The new deposit limit
function revokeDepositLimitAccessControl(uint256 _depositLimit) external {
_requireTimelock();
_revokeDepositAccessControl(_depositLimit);
}
/// @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();
}
if (isInterestAccessControlRevoked) revert AccessControlRevoked();
// Resets the lastTimestamp which has the effect of no interest accruing over the pause period
_addInterest();
_pauseInterest(_isPaused);
}
/// @notice The ```revokeInterestAccessControl``` function revokes interest access control
function revokeInterestAccessControl() external {
_requireTimelock();
_revokeInterestAccessControl();
}
}
// SPDX-License-Identifier: ISC
pragma solidity ^0.8.18;
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ==================== FraxlendPairAccessControl =====================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance
// Primary Author
// Drake Evans: https://github.com/DrakeEvans
// Reviewers
// Dennis: https://github.com/denett
// ====================================================================
import "@openzeppelin/contracts/access/Ownable2Step.sol";
import "./Timelock2Step.sol";
import "./FraxlendPairAccessControlErrors.sol";
/// @title FraxlendPairAccessControl
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @notice An abstract contract which contains the access control logic for FraxlendPair
abstract contract FraxlendPairAccessControl is Timelock2Step, Ownable2Step, FraxlendPairAccessControlErrors {
// Deployer
address public immutable DEPLOYER_ADDRESS;
// Admin contracts
address public circuitBreakerAddress;
// access control
uint256 public borrowLimit = type(uint256).max;
bool public isBorrowAccessControlRevoked;
uint256 public depositLimit = type(uint256).max;
bool public isDepositAccessControlRevoked;
bool public isRepayPaused;
bool public isRepayAccessControlRevoked;
bool public isWithdrawPaused;
bool public isWithdrawAccessControlRevoked;
bool public isLiquidatePaused;
bool public isLiquidateAccessControlRevoked;
bool public isInterestPaused;
bool public isInterestAccessControlRevoked;
/// @param _immutables abi.encode(address _circuitBreakerAddress, address _comptrollerAddress, address _timelockAddress)
constructor(bytes memory _immutables) Timelock2Step() Ownable() {
// 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 ```RevokeBorrowAccessControl``` event is emitted when access to borrow limit is revoked
/// @param borrowLimit The final permanent borrow limit
event RevokeBorrowAccessControl(uint256 borrowLimit);
function _revokeBorrowAccessControl(uint256 _borrowLimit) internal {
isBorrowAccessControlRevoked = true;
borrowLimit = _borrowLimit;
emit RevokeBorrowAccessControl(_borrowLimit);
}
/// @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 ```RevokeDepositAccessControl``` event is emitted when access to deposit limit is revoked
/// @param depositLimit The final permanent deposit limit
event RevokeDepositAccessControl(uint256 depositLimit);
function _revokeDepositAccessControl(uint256 _depositLimit) internal {
isDepositAccessControlRevoked = true;
depositLimit = _depositLimit;
emit RevokeDepositAccessControl(_depositLimit);
}
/// @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 ```RevokeInterestAccessControl``` event is emitted when interest access control is revoked
event RevokeInterestAccessControl();
function _revokeInterestAccessControl() internal {
isInterestAccessControlRevoked = true;
emit RevokeInterestAccessControl();
}
/// @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 ^0.8.18;
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ================ FraxlendPairAccessControlErrors ===================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance
// Primary Author
// Drake Evans: https://github.com/DrakeEvans
// Reviewers
// Dennis: https://github.com/denett
// ====================================================================
/// @title FraxlendPairAccessControlErrors
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @notice An abstract contract which contains the errors for the Access Control contract
abstract contract FraxlendPairAccessControlErrors {
error OnlyProtocolOrOwner();
error OnlyTimelockOrOwner();
error ExceedsBorrowLimit();
error AccessControlRevoked();
error RepayPaused();
error ExceedsDepositLimit();
error WithdrawPaused();
error LiquidatePaused();
error InterestPaused();
}
// SPDX-License-Identifier: ISC
pragma solidity ^0.8.18;
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ===================== FraxlendPairConstants ========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance
// Primary Author
// Drake Evans: https://github.com/DrakeEvans
// Reviewers
// Dennis: https://github.com/denett
// Sam Kazemian: https://github.com/samkazemian
// Travis Moore: https://github.com/FortisFortuna
// Jack Corddry: https://github.com/corddry
// Rich Gee: https://github.com/zer0blockchain
// ====================================================================
/// @title FraxlendPairConstants
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @notice An abstract contract which contains the errors and constants for the FraxlendPair contract
abstract contract FraxlendPairConstants {
// ============================================================================================
// Constants
// ============================================================================================
// Precision settings
uint256 public constant LTV_PRECISION = 1e5; // 5 decimals
uint256 public constant LIQ_PRECISION = 1e5;
uint256 public constant UTIL_PREC = 1e5;
uint256 public constant FEE_PRECISION = 1e5;
uint256 public constant EXCHANGE_PRECISION = 1e18;
uint256 public constant DEVIATION_PRECISION = 1e5;
uint256 public constant RATE_PRECISION = 1e18;
// Protocol Fee
uint256 public 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();
}
// SPDX-License-Identifier: ISC
pragma solidity ^0.8.18;
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ========================= FraxlendPairCore =========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance
// Primary Author
// Drake Evans: https://github.com/DrakeEvans
// Reviewers
// Dennis: https://github.com/denett
// Sam Kazemian: https://github.com/samkazemian
// Travis Moore: https://github.com/FortisFortuna
// Jack Corddry: https://github.com/corddry
// Rich Gee: https://github.com/zer0blockchain
// ====================================================================
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/math/SafeCast.sol";
import "./FraxlendPairAccessControl.sol";
import "./FraxlendPairConstants.sol";
import "./libraries/VaultAccount.sol";
import "./libraries/SafeERC20.sol";
import "./interfaces/IDualOracle.sol";
import "./interfaces/IRateCalculatorV2.sol";
import "./interfaces/ISwapper.sol";
/// @title FraxlendPairCore
/// @author Drake Evans (Frax Finance) https://github.com/drakeevans
/// @notice An abstract contract which contains the core logic and storage for the FraxlendPair
abstract contract FraxlendPairCore is FraxlendPairAccessControl, FraxlendPairConstants, 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
// 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
) FraxlendPairAccessControl(_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 ```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 ```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 ```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 ```LeveragedPosition``` event is emitted when a borrower takes out a new leveraged position
/// @param _borrower The account for which the debt is debited
/// @param _swapperAddress The address of the swapper which conforms the FraxSwap interface
/// @param _borrowAmount The amount of Asset Token to be borrowed to be borrowed
/// @param _borrowShares The number of Borrow Shares the borrower is credited
/// @param _initialCollateralAmount The amount of initial Collateral Tokens supplied by the borrower
/// @param _amountCollateralOut The amount of Collateral Token which was received for the Asset Tokens
event LeveragedPosition(
address indexed _borrower,
address _swapperAddress,
uint256 _borrowAmount,
uint256 _borrowShares,
uint256 _initialCollateralAmount,
uint256 _amountCollateralOut
);
/// @notice The ```leveragedPosition``` function allows a user to enter a leveraged borrow position with minimal upfront Collateral
/// @dev Caller must invoke ```ERC20.approve()``` on the Collateral Token contract prior to calling function
/// @param _swapperAddress The address of the whitelisted swapper to use to swap borrowed Asset Tokens for Collateral Tokens
/// @param _borrowAmount The amount of Asset Tokens borrowed
/// @param _initialCollateralAmount The initial amount of Collateral Tokens supplied by the borrower
/// @param _amountCollateralOutMin The minimum amount of Collateral Tokens to be received in exchange for the borrowed Asset Tokens
/// @param _path An array containing the addresses of ERC20 tokens to swap. Adheres to UniV2 style path params.
/// @return _totalCollateralBalance The total amount of Collateral Tokens added to a users account (initial + swap)
function leveragedPosition(
address _swapperAddress,
uint256 _borrowAmount,
uint256 _initialCollateralAmount,
uint256 _amountCollateralOutMin,
address[] memory _path
) external nonReentrant isSolvent(msg.sender) returns (uint256 _totalCollateralBalance) {
// 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(_assetContract)) {
revert InvalidPath(address(_assetContract), _path[0]);
}
if (_path[_path.length - 1] != address(_collateralContract)) {
revert InvalidPath(address(_collateralContract), _path[_path.length - 1]);
}
// Add initial collateral
if (_initialCollateralAmount > 0) {
_addCollateral(msg.sender, _initialCollateralAmount, msg.sender);
}
// Debit borrowers account
// setting recipient to address(this) means no transfer will happen
uint256 _borrowShares = _borrowAsset(_borrowAmount.toUint128(), address(this));
// Interactions
_assetContract.approve(_swapperAddress, _borrowAmount);
// Even though swappers are trusted, we verify the balance before and after swap
uint256 _initialCollateralBalance = _collateralContract.balanceOf(address(this));
ISwapper(_swapperAddress).swapExactTokensForTokens(
_borrowAmount,
_amountCollateralOutMin,
_path,
address(this),
block.timestamp
);
uint256 _finalCollateralBalance = _collateralContract.balanceOf(address(this));
// Note: VIOLATES CHECKS-EFFECTS-INTERACTION pattern, make sure function is NONREENTRANT
// Effects: bookkeeping & write to state
uint256 _amountCollateralOut = _finalCollateralBalance - _initialCollateralBalance;
if (_amountCollateralOut < _amountCollateralOutMin) {
revert SlippageTooHigh(_amountCollateralOutMin, _amountCollateralOut);
}
// address(this) as _sender means no transfer occurs as the pair has already received the collateral during swap
_addCollateral(address(this), _amountCollateralOut, msg.sender);
_totalCollateralBalance = _initialCollateralAmount + _amountCollateralOut;
emit LeveragedPosition(
msg.sender,
_swapperAddress,
_borrowAmount,
_borrowShares,
_initialCollateralAmount,
_amountCollateralOut
);
}
/// @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: ISC
pragma solidity >=0.8.18;
interface IDualOracle {
function getPrices() external view returns (bool _isBadData, uint256 _priceLow, uint256 _priceHigh);
function decimals() external view returns (uint8);
function oracleType() external view returns (uint256);
function name() external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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: ISC
pragma solidity ^0.8.18;
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
pragma solidity >=0.8.18;
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 v4.7.0) (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 anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing 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 (last updated v4.8.0) (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() external {
address sender = _msgSender();
require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
_transferOwnership(sender);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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;
}
}
// 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 ^0.8.18;
import "@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: ISC
pragma solidity ^0.8.18;
// ====================================================================
// | ______ _______ |
// | / _____________ __ __ / ____(_____ ____ _____ ________ |
// | / /_ / ___/ __ `| |/_/ / /_ / / __ \/ __ `/ __ \/ ___/ _ \ |
// | / __/ / / / /_/ _> < / __/ / / / / / /_/ / / / / /__/ __/ |
// | /_/ /_/ \__,_/_/|_| /_/ /_/_/ /_/\__,_/_/ /_/\___/\___/ |
// | |
// ====================================================================
// ========================== Timelock2Step ===========================
// ====================================================================
// Frax Finance: https://github.com/FraxFinance
// Primary Author
// Drake Evans: https://github.com/DrakeEvans
// Reviewers
// Dennis: https://github.com/denett
// ====================================================================
/// @title FraxlendPairCore
/// @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: ISC
pragma solidity ^0.8.18;
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 v4.4.1 (token/ERC20/extensions/draft-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);
}
{
"compilationTarget": {
"src/contracts/FraxlendPair.sol": "FraxlendPair"
},
"evmVersion": "paris",
"libraries": {},
"metadata": {
"bytecodeHash": "none"
},
"optimizer": {
"enabled": true,
"runs": 1660
},
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