Contract Name:
TxBuilderExtension
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "openzeppelin-contracts/contracts/access/Ownable2Step.sol";
import "openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";
import "openzeppelin-contracts/contracts/token/ERC20/IERC20.sol";
import "openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interfaces/IDeferLiquidityCheck.sol";
import "../interfaces/IApeFinance.sol";
import "../interfaces/IPToken.sol";
import "../interfaces/IWeth.sol";
contract TxBuilderExtension is ReentrancyGuard, Ownable2Step, IDeferLiquidityCheck {
using SafeERC20 for IERC20;
/// @notice The action for deferring liquidity check
bytes32 public constant ACTION_DEFER_LIQUIDITY_CHECK = "ACTION_DEFER_LIQUIDITY_CHECK";
/// @notice The action for supplying asset
bytes32 public constant ACTION_SUPPLY = "ACTION_SUPPLY";
/// @notice The action for borrowing asset
bytes32 public constant ACTION_BORROW = "ACTION_BORROW";
/// @notice The action for redeeming asset
bytes32 public constant ACTION_REDEEM = "ACTION_REDEEM";
/// @notice The action for repaying asset
bytes32 public constant ACTION_REPAY = "ACTION_REPAY";
/// @notice The action for supplying native token
bytes32 public constant ACTION_SUPPLY_NATIVE_TOKEN = "ACTION_SUPPLY_NATIVE_TOKEN";
/// @notice The action for borrowing native token
bytes32 public constant ACTION_BORROW_NATIVE_TOKEN = "ACTION_BORROW_NATIVE_TOKEN";
/// @notice The action for redeeming native token
bytes32 public constant ACTION_REDEEM_NATIVE_TOKEN = "ACTION_REDEEM_NATIVE_TOKEN";
/// @notice The action for repaying native token
bytes32 public constant ACTION_REPAY_NATIVE_TOKEN = "ACTION_REPAY_NATIVE_TOKEN";
/// @notice The action for supplying stEth
bytes32 public constant ACTION_SUPPLY_STETH = "ACTION_SUPPLY_STETH";
/// @notice The action for borrowing stEth
bytes32 public constant ACTION_BORROW_STETH = "ACTION_BORROW_STETH";
/// @notice The action for redeeming stEth
bytes32 public constant ACTION_REDEEM_STETH = "ACTION_REDEEM_STETH";
/// @notice The action for repaying stEth
bytes32 public constant ACTION_REPAY_STETH = "ACTION_REPAY_STETH";
/// @notice The action for supplying pToken
bytes32 public constant ACTION_SUPPLY_PTOKEN = "ACTION_SUPPLY_PTOKEN";
/// @notice The action for redeeming pToken
bytes32 public constant ACTION_REDEEM_PTOKEN = "ACTION_REDEEM_PTOKEN";
/// @dev Transient storage variable used for native token amount
uint256 private unusedNativeToken;
/// @notice The address of ApeFinance
IApeFinance public immutable apeFinance;
/// @notice The address of WAPE
address public immutable wape;
/**
* @notice Construct a new TxBuilderExtension contract
* @param apeFinance_ The ApeFinance contract
* @param wape_ The WAPE contract
*/
constructor(address apeFinance_, address wape_) {
apeFinance = IApeFinance(apeFinance_);
wape = wape_;
}
/* ========== MUTATIVE FUNCTIONS ========== */
struct Action {
bytes32 name;
bytes data;
}
/**
* @notice Execute a list of actions in order
* @param actions The list of actions
*/
function execute(Action[] calldata actions) external payable {
unusedNativeToken = msg.value;
executeInternal(msg.sender, actions, 0);
}
/// @inheritdoc IDeferLiquidityCheck
function onDeferredLiquidityCheck(bytes memory encodedData) external override {
require(msg.sender == address(apeFinance), "untrusted message sender");
(address initiator, Action[] memory actions, uint256 index) =
abi.decode(encodedData, (address, Action[], uint256));
executeInternal(initiator, actions, index);
}
/* ========== RESTRICTED FUNCTIONS ========== */
/**
* @notice Admin seizes the asset from the contract.
* @param recipient The recipient of the seized asset.
* @param asset The asset to seize.
*/
function seize(address recipient, address asset) external onlyOwner {
IERC20(asset).safeTransfer(recipient, IERC20(asset).balanceOf(address(this)));
}
/**
* @notice Admin seizes the native token from the contract.
* @param recipient The recipient of the seized native token.
*/
function seizeNative(address recipient) external onlyOwner {
(bool sent,) = recipient.call{value: address(this).balance}("");
require(sent, "failed to send native token");
}
/* ========== INTERNAL FUNCTIONS ========== */
/**
* @dev Execute a list of actions for user in order.
* @param user The address of the user
* @param actions The list of actions
* @param index The index of the action to start with
*/
function executeInternal(address user, Action[] memory actions, uint256 index) internal {
uint256 i = index;
while (i < actions.length) {
Action memory action = actions[i];
if (action.name == ACTION_DEFER_LIQUIDITY_CHECK) {
deferLiquidityCheck(user, abi.encode(user, actions, i + 1));
// Break the loop as we will re-enter the loop after the liquidity check is deferred.
break;
} else if (action.name == ACTION_SUPPLY) {
(address asset, uint256 amount) = abi.decode(action.data, (address, uint256));
supply(user, asset, amount);
} else if (action.name == ACTION_BORROW) {
(address asset, uint256 amount) = abi.decode(action.data, (address, uint256));
borrow(user, asset, amount);
} else if (action.name == ACTION_REDEEM) {
(address asset, uint256 amount) = abi.decode(action.data, (address, uint256));
redeem(user, asset, amount);
} else if (action.name == ACTION_REPAY) {
(address asset, uint256 amount) = abi.decode(action.data, (address, uint256));
repay(user, asset, amount);
} else if (action.name == ACTION_SUPPLY_NATIVE_TOKEN) {
uint256 supplyAmount = abi.decode(action.data, (uint256));
supplyNativeToken(user, supplyAmount);
unusedNativeToken -= supplyAmount;
} else if (action.name == ACTION_BORROW_NATIVE_TOKEN) {
uint256 borrowAmount = abi.decode(action.data, (uint256));
borrowNativeToken(user, borrowAmount);
} else if (action.name == ACTION_REDEEM_NATIVE_TOKEN) {
uint256 redeemAmount = abi.decode(action.data, (uint256));
redeemNativeToken(user, redeemAmount);
} else if (action.name == ACTION_REPAY_NATIVE_TOKEN) {
uint256 repayAmount = abi.decode(action.data, (uint256));
repayAmount = repayNativeToken(user, repayAmount);
unusedNativeToken -= repayAmount;
} else if (action.name == ACTION_SUPPLY_PTOKEN) {
(address pToken, uint256 amount) = abi.decode(action.data, (address, uint256));
supplyPToken(user, pToken, amount);
} else if (action.name == ACTION_REDEEM_PTOKEN) {
(address pToken, uint256 amount) = abi.decode(action.data, (address, uint256));
redeemPToken(user, pToken, amount);
} else {
revert("invalid action");
}
unchecked {
i++;
}
}
// Refund unused native token back to user if the action list is fully executed.
if (i == actions.length && unusedNativeToken > 0) {
(bool sent,) = user.call{value: unusedNativeToken}("");
require(sent, "failed to send native token");
unusedNativeToken = 0;
}
}
/**
* @dev Defers the liquidity check.
* @param user The address of the user
* @param data The encoded data
*/
function deferLiquidityCheck(address user, bytes memory data) internal {
apeFinance.deferLiquidityCheck(user, data);
}
/**
* @dev Supplies the asset to ApeFinance.
* @param user The address of the user
* @param asset The address of the asset to supply
* @param amount The amount of the asset to supply
*/
function supply(address user, address asset, uint256 amount) internal nonReentrant {
apeFinance.supply(user, user, asset, amount);
}
/**
* @dev Borrows the asset from ApeFinance.
* @param user The address of the user
* @param asset The address of the asset to borrow
* @param amount The amount of the asset to borrow
*/
function borrow(address user, address asset, uint256 amount) internal nonReentrant {
apeFinance.borrow(user, user, asset, amount);
}
/**
* @dev Redeems the asset to ApeFinance.
* @param user The address of the user
* @param asset The address of the asset to redeem
* @param amount The amount of the asset to redeem
*/
function redeem(address user, address asset, uint256 amount) internal nonReentrant {
apeFinance.redeem(user, user, asset, amount);
}
/**
* @dev Repays the asset to ApeFinance.
* @param user The address of the user
* @param asset The address of the asset to repay
* @param amount The amount of the asset to repay
*/
function repay(address user, address asset, uint256 amount) internal nonReentrant {
apeFinance.repay(user, user, asset, amount);
}
/**
* @dev Wraps the native token and supplies it to ApeFinance.
* @param user The address of the user
* @param supplyAmount The amount of the wrapped native token to supply
*/
function supplyNativeToken(address user, uint256 supplyAmount) internal nonReentrant {
IWeth(wape).deposit{value: supplyAmount}();
IERC20(wape).safeIncreaseAllowance(address(apeFinance), supplyAmount);
apeFinance.supply(address(this), user, wape, supplyAmount);
}
/**
* @dev Borrows the wrapped native token and unwraps it to the user.
* @param user The address of the user
* @param borrowAmount The amount of the wrapped native token to borrow
*/
function borrowNativeToken(address user, uint256 borrowAmount) internal nonReentrant {
apeFinance.borrow(user, address(this), wape, borrowAmount);
IWeth(wape).withdraw(borrowAmount);
(bool sent,) = user.call{value: borrowAmount}("");
require(sent, "failed to send native token");
}
/**
* @dev Redeems the wrapped native token and unwraps it to the user.
* @param user The address of the user
* @param redeemAmount The amount of the wrapped native token to redeem, -1 means redeem all
*/
function redeemNativeToken(address user, uint256 redeemAmount) internal nonReentrant {
redeemAmount = apeFinance.redeem(user, address(this), wape, redeemAmount);
IWeth(wape).withdraw(redeemAmount);
(bool sent,) = user.call{value: redeemAmount}("");
require(sent, "failed to send native token");
}
/**
* @dev Wraps the native token and repays it to ApeFinance.
* @param user The address of the user
* @param repayAmount The amount of the wrapped native token to repay, -1 means repay all
*/
function repayNativeToken(address user, uint256 repayAmount) internal nonReentrant returns (uint256) {
if (repayAmount == type(uint256).max) {
apeFinance.accrueInterest(wape);
repayAmount = apeFinance.getBorrowBalance(user, wape);
}
IWeth(wape).deposit{value: repayAmount}();
IERC20(wape).safeIncreaseAllowance(address(apeFinance), repayAmount);
apeFinance.repay(address(this), user, wape, repayAmount);
return repayAmount;
}
/**
* @dev Wraps the underlying and supplies the pToken to ApeFinance.
* @param user The address of the user
* @param pToken The address of the pToken
* @param amount The amount of the pToken to supply
*/
function supplyPToken(address user, address pToken, uint256 amount) internal nonReentrant {
address underlying = IPToken(pToken).getUnderlying();
IERC20(underlying).safeTransferFrom(user, pToken, amount);
IPToken(pToken).absorb(address(this));
IERC20(pToken).safeIncreaseAllowance(address(apeFinance), amount);
apeFinance.supply(address(this), user, pToken, amount);
}
/**
* @dev Redeems the pToken and unwraps the underlying to the user.
* @param user The address of the user
* @param pToken The address of the pToken
* @param amount The amount of the pToken to redeem
*/
function redeemPToken(address user, address pToken, uint256 amount) internal nonReentrant {
amount = apeFinance.redeem(user, address(this), pToken, amount);
IPToken(pToken).unwrap(amount);
address underlying = IPToken(pToken).getUnderlying();
IERC20(underlying).safeTransfer(user, amount);
}
receive() external payable {}
}
// 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 v4.6.0) (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 (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
// Return data is optional
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IDeferLiquidityCheck {
/**
* @dev The callback function that deferLiquidityCheck will invoke.
* @param data The arbitrary data that was passed in by the caller
*/
function onDeferredLiquidityCheck(bytes memory data) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../libraries/DataTypes.sol";
interface IApeFinance {
/* ========== USER INTERFACES ========== */
function accrueInterest(address market) external;
function supply(address from, address to, address market, uint256 amount) external;
function borrow(address from, address to, address asset, uint256 amount) external;
function redeem(address from, address to, address asset, uint256 amount) external returns (uint256);
function repay(address from, address to, address asset, uint256 amount) external returns (uint256);
function liquidate(
address liquidator,
address borrower,
address marketBorrow,
address marketCollateral,
uint256 repayAmount
) external returns (uint256, uint256);
function deferLiquidityCheck(address user, bytes memory data) external;
function getBorrowBalance(address user, address market) external view returns (uint256);
function getATokenBalance(address user, address market) external view returns (uint256);
function getSupplyBalance(address user, address market) external view returns (uint256);
function isMarketListed(address market) external view returns (bool);
function getExchangeRate(address market) external view returns (uint256);
function getTotalSupply(address market) external view returns (uint256);
function getTotalBorrow(address market) external view returns (uint256);
function getTotalCash(address market) external view returns (uint256);
function getTotalReserves(address market) external view returns (uint256);
function getAccountLiquidity(address user) external view returns (uint256, uint256, uint256);
function isAllowedExtension(address user, address extension) external view returns (bool);
function transferAToken(address market, address from, address to, uint256 amount) external;
function setSubAccountExtension(address primary, uint256 subAccountId, bool allowed) external;
/* ========== MARKET CONFIGURATOR INTERFACES ========== */
function getMarketConfiguration(address market) external view returns (DataTypes.MarketConfig memory);
function listMarket(address market, DataTypes.MarketConfig calldata config) external;
function delistMarket(address market) external;
function setMarketConfiguration(address market, DataTypes.MarketConfig calldata config) external;
/* ========== CREDIT LIMIT MANAGER INTERFACES ========== */
function getCreditLimit(address user, address market) external view returns (uint256);
function getUserCreditMarkets(address user) external view returns (address[] memory);
function isCreditAccount(address user) external view returns (bool);
function setCreditLimit(address user, address market, uint256 credit) external;
/* ========== RESERVE MANAGER INTERFACES ========== */
function absorbToReserves(address market) external;
function reduceReserves(address market, uint256 aTokenAmount, address recipient) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "openzeppelin-contracts/contracts/token/ERC20/IERC20.sol";
interface IPToken is IERC20 {
function getUnderlying() external view returns (address);
function wrap(uint256 amount) external;
function unwrap(uint256 amount) external;
function absorb(address user) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IWeth {
function deposit() external payable;
function withdraw(uint256 wad) external;
function balanceOf(address) external view returns (uint256);
}
// 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 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);
}
// 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
pragma solidity ^0.8.0;
library DataTypes {
struct UserBorrow {
uint256 borrowBalance;
uint256 borrowIndex;
}
struct MarketConfig {
// 1 + 1 + 2 + 2 + 2 + 2 + 1 + 1 = 12
bool isListed;
uint8 pauseFlags;
uint16 collateralFactor;
uint16 liquidationThreshold;
uint16 liquidationBonus;
uint16 reserveFactor;
bool isPToken;
bool isDelisted;
// 20 + 20 + 20 + 32 + 32 + 32
address aTokenAddress;
address debtTokenAddress;
address interestRateModelAddress;
uint256 supplyCap;
uint256 borrowCap;
uint256 initialExchangeRate;
}
struct Market {
MarketConfig config;
uint40 lastUpdateTimestamp;
uint256 totalCash;
uint256 totalBorrow;
uint256 totalSupply;
uint256 totalReserves;
uint256 borrowIndex;
mapping(address => UserBorrow) userBorrows;
mapping(address => uint256) userSupplies;
}
}
// 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;
}
}