Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
import "@1inch/solidity-utils/contracts/libraries/SafeERC20.sol";
import "./features/ContractOnlyEthRecipient.sol";
import "./interfaces/ISwapExecutor.sol";
import "./libs/TokenLibrary.sol";
import "./Errors.sol";
import "@openzeppelin/contracts/access/Ownable2Step.sol";
/**
* @title SwapFacade
* @notice This facade performs minReturn safety checks and holds all approves to ensure safety of all arbitrary calls
*/
contract SwapFacade is Ownable2Step {
using SafeERC20 for IERC20;
using TokenLibrary for IERC20;
/// @notice Performs tokens swap
/// @param executor Address of low level executor used to make actual swaps
/// @param amount Amount of source tokens user is willing to swap
/// @param targetToken Token that user is willing to get as result. This will be used for minReturn check to decide if swap executed successfully
/// @param minReturn Minimal amount of targetToken that user is willing to receive. If not reached transaction reverts
/// @param deadline Safety parameter against stalled transactions. If deadline reached swap reverts unconditionally
/// @param swapDescriptions Descriptions that describe how exactly swaps should be performed
/// @param permit Signed permit for spending `amount` of tokens. Optional. May be used instead of manually approving tokens before calling `swap`
function swap(
ISwapExecutor executor,
uint256 amount,
IERC20 targetToken,
uint256 minReturn,
address payable recipient,
uint256 deadline,
ISwapExecutor.SwapDescription[] calldata swapDescriptions,
bytes calldata permit
) external payable returns (uint256) {
{
// solhint-disable-next-line not-rely-on-time
if (deadline < block.timestamp) {
// solhint-disable-next-line not-rely-on-time
revert TransactionExpired(deadline, block.timestamp);
}
}
if (amount == 0) {
revert ZeroInput();
}
if (recipient == address(0)) {
revert ZeroRecipient();
}
if (swapDescriptions.length == 0) {
revert EmptySwap();
}
IERC20 sourceToken = swapDescriptions[0].sourceToken;
if (msg.value > 0) {
if (msg.value != amount) {
revert EthValueAmountMismatch();
} else if (permit.length > 0) {
revert PermitNotAllowedForEthSwap();
} else if (!TokenLibrary.isEth(sourceToken)) {
revert EthValueSourceTokenMismatch();
}
}
else {
uint256 currentBalance = sourceToken.balanceOf(address(executor));
if (currentBalance < amount)
{
if (permit.length > 0) {
SafeERC20.tryPermit(sourceToken, permit);
}
sourceToken.safeTransferFrom(msg.sender, address(executor), amount);
}
}
return _swap(executor, targetToken, minReturn, recipient, swapDescriptions);
}
/// @notice Performs tokens swap and validates swap success against minReturn value
function _swap(
ISwapExecutor executor,
IERC20 targetToken,
uint256 minReturn,
address payable recipient,
ISwapExecutor.SwapDescription[] calldata swapDescriptions
) private returns (uint256) {
uint256 balanceBeforeSwap = targetToken.universalBalanceOf(recipient);
executor.executeSwap{value: msg.value}(recipient, targetToken, swapDescriptions);
uint256 balanceAfterSwap = targetToken.universalBalanceOf(recipient);
uint256 totalSwappedAmount = balanceAfterSwap - balanceBeforeSwap;
if (totalSwappedAmount < minReturn) {
revert MinReturnError(totalSwappedAmount, minReturn);
}
return totalSwappedAmount;
}
function sweep(IERC20 token, address destination) external onlyOwner {
token.safeTransfer(destination, IERC20(token).balanceOf(address(this)));
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
pragma abicoder v1;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";
import "../interfaces/IDaiLikePermit.sol";
import "../interfaces/IPermit2.sol";
import "../interfaces/IWETH.sol";
import "../libraries/RevertReasonForwarder.sol";
/// @title Implements efficient safe methods for ERC20 interface.
library SafeERC20 {
error SafeTransferFailed();
error SafeTransferFromFailed();
error ForceApproveFailed();
error SafeIncreaseAllowanceFailed();
error SafeDecreaseAllowanceFailed();
error SafePermitBadLength();
address private constant _PERMIT2 = 0x000000000022D473030F116dDEE9F6B43aC78BA3;
bytes4 private constant _PERMIT_LENGHT_ERROR = 0x68275857; // SafePermitBadLength.selector
/// @dev Ensures method do not revert or return boolean `true`, admits call to non-smart-contract.
function safeTransferFromUniversal(
IERC20 token,
address from,
address to,
uint256 amount,
bool permit2
) internal {
if (permit2) {
safeTransferFromPermit2(token, from, to, uint160(amount));
} else {
safeTransferFrom(token, from, to, amount);
}
}
/// @dev Ensures method do not revert or return boolean `true`, admits call to non-smart-contract.
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 amount
) internal {
bytes4 selector = token.transferFrom.selector;
bool success;
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
let data := mload(0x40)
mstore(data, selector)
mstore(add(data, 0x04), from)
mstore(add(data, 0x24), to)
mstore(add(data, 0x44), amount)
success := call(gas(), token, 0, data, 100, 0x0, 0x20)
if success {
switch returndatasize()
case 0 {
success := gt(extcodesize(token), 0)
}
default {
success := and(gt(returndatasize(), 31), eq(mload(0), 1))
}
}
}
if (!success) revert SafeTransferFromFailed();
}
/// @dev Permit2 version of safeTransferFrom above.
function safeTransferFromPermit2(
IERC20 token,
address from,
address to,
uint160 amount
) internal {
bytes4 selector = IPermit2.transferFrom.selector;
bool success;
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
let data := mload(0x40)
mstore(data, selector)
mstore(add(data, 0x04), from)
mstore(add(data, 0x24), to)
mstore(add(data, 0x44), amount)
mstore(add(data, 0x64), token)
success := call(gas(), _PERMIT2, 0, data, 0x84, 0x0, 0x0)
if success {
success := gt(extcodesize(_PERMIT2), 0)
}
}
if (!success) revert SafeTransferFromFailed();
}
/// @dev Ensures method do not revert or return boolean `true`, admits call to non-smart-contract.
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
if (!_makeCall(token, token.transfer.selector, to, value)) {
revert SafeTransferFailed();
}
}
/// @dev If `approve(from, to, amount)` fails, try to `approve(from, to, 0)` before retry.
function forceApprove(
IERC20 token,
address spender,
uint256 value
) internal {
if (!_makeCall(token, token.approve.selector, spender, value)) {
if (
!_makeCall(token, token.approve.selector, spender, 0) ||
!_makeCall(token, token.approve.selector, spender, value)
) {
revert ForceApproveFailed();
}
}
}
/// @dev Allowance increase with safe math check.
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 allowance = token.allowance(address(this), spender);
if (value > type(uint256).max - allowance) revert SafeIncreaseAllowanceFailed();
forceApprove(token, spender, allowance + value);
}
/// @dev Allowance decrease with safe math check.
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 allowance = token.allowance(address(this), spender);
if (value > allowance) revert SafeDecreaseAllowanceFailed();
forceApprove(token, spender, allowance - value);
}
function safePermit(IERC20 token, bytes calldata permit) internal {
if (!tryPermit(token, msg.sender, address(this), permit)) RevertReasonForwarder.reRevert();
}
function safePermit(IERC20 token, address owner, address spender, bytes calldata permit) internal {
if (!tryPermit(token, owner, spender, permit)) RevertReasonForwarder.reRevert();
}
function tryPermit(IERC20 token, bytes calldata permit) internal returns(bool success) {
return tryPermit(token, msg.sender, address(this), permit);
}
function tryPermit(IERC20 token, address owner, address spender, bytes calldata permit) internal returns(bool success) {
bytes4 permitSelector = IERC20Permit.permit.selector;
bytes4 daiPermitSelector = IDaiLikePermit.permit.selector;
bytes4 permit2Selector = IPermit2.permit.selector;
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
let ptr := mload(0x40)
switch permit.length
case 100 {
mstore(ptr, permitSelector)
mstore(add(ptr, 0x04), owner)
mstore(add(ptr, 0x24), spender)
// Compact IERC20Permit.permit(uint256 value, uint32 deadline, uint256 r, uint256 vs)
{ // stack too deep
let deadline := shr(224, calldataload(add(permit.offset, 0x20)))
let vs := calldataload(add(permit.offset, 0x44))
calldatacopy(add(ptr, 0x44), permit.offset, 0x20) // value
mstore(add(ptr, 0x64), sub(deadline, 1))
mstore(add(ptr, 0x84), add(27, shr(255, vs)))
calldatacopy(add(ptr, 0xa4), add(permit.offset, 0x24), 0x20) // r
mstore(add(ptr, 0xc4), shr(1, shl(1, vs)))
}
// IERC20Permit.permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s)
success := call(gas(), token, 0, ptr, 0xe4, 0, 0)
}
case 72 {
mstore(ptr, daiPermitSelector)
mstore(add(ptr, 0x04), owner)
mstore(add(ptr, 0x24), spender)
// Compact IDaiLikePermit.permit(uint32 nonce, uint32 expiry, uint256 r, uint256 vs)
{ // stack too deep
let expiry := shr(224, calldataload(add(permit.offset, 0x04)))
let vs := calldataload(add(permit.offset, 0x28))
mstore(add(ptr, 0x44), shr(224, calldataload(permit.offset)))
mstore(add(ptr, 0x64), sub(expiry, 1))
mstore(add(ptr, 0x84), true)
mstore(add(ptr, 0xa4), add(27, shr(255, vs)))
calldatacopy(add(ptr, 0xc4), add(permit.offset, 0x08), 0x20) // r
mstore(add(ptr, 0xe4), shr(1, shl(1, vs)))
}
// IDaiLikePermit.permit(address holder, address spender, uint256 nonce, uint256 expiry, bool allowed, uint8 v, bytes32 r, bytes32 s)
success := call(gas(), token, 0, ptr, 0x104, 0, 0)
}
case 224 {
mstore(ptr, permitSelector)
calldatacopy(add(ptr, 0x04), permit.offset, permit.length)
// IERC20Permit.permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s)
success := call(gas(), token, 0, ptr, add(4, permit.length), 0, 0)
}
case 256 {
mstore(ptr, daiPermitSelector)
calldatacopy(add(ptr, 0x04), permit.offset, permit.length)
// IDaiLikePermit.permit(address holder, address spender, uint256 nonce, uint256 expiry, bool allowed, uint8 v, bytes32 r, bytes32 s)
success := call(gas(), token, 0, ptr, add(4, permit.length), 0, 0)
}
case 128 {
// Compact IPermit2.permit(address owner, PermitSingle calldata permitSingle, bytes calldata signature)
mstore(ptr, permit2Selector)
mstore(add(ptr, 0x04), owner)
mstore(add(ptr, 0x24), token)
calldatacopy(add(ptr, 0x50), permit.offset, 0x14) // amount
calldatacopy(add(ptr, 0x7e), add(permit.offset, 0x14), 0x06) // expiration
calldatacopy(add(ptr, 0x9e), add(permit.offset, 0x1a), 0x06) // nonce
mstore(add(ptr, 0xa4), spender)
calldatacopy(add(ptr, 0xc4), add(permit.offset, 0x20), 0x20) // sigDeadline
mstore(add(ptr, 0xe4), 0x100)
mstore(add(ptr, 0x104), 0x40)
calldatacopy(add(ptr, 0x124), add(permit.offset, 0x40), 0x20) // r
calldatacopy(add(ptr, 0x144), add(permit.offset, 0x60), 0x20) // vs
// IPermit2.permit(address owner, PermitSingle calldata permitSingle, bytes calldata signature)
success := call(gas(), _PERMIT2, 0, ptr, 388, 0, 0)
}
case 384 {
mstore(ptr, permit2Selector)
calldatacopy(add(ptr, 0x04), permit.offset, permit.length)
// IPermit2.permit(address owner, PermitSingle calldata permitSingle, bytes calldata signature)
success := call(gas(), _PERMIT2, 0, ptr, 388, 0, 0)
}
default {
mstore(ptr, _PERMIT_LENGHT_ERROR)
revert(ptr, 4)
}
}
}
function _makeCall(
IERC20 token,
bytes4 selector,
address to,
uint256 amount
) private returns (bool success) {
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
let data := mload(0x40)
mstore(data, selector)
mstore(add(data, 0x04), to)
mstore(add(data, 0x24), amount)
success := call(gas(), token, 0, data, 0x44, 0x0, 0x20)
if success {
switch returndatasize()
case 0 {
success := gt(extcodesize(token), 0)
}
default {
success := and(gt(returndatasize(), 31), eq(mload(0), 1))
}
}
}
}
function safeDeposit(IWETH weth, uint256 amount) internal {
if (amount > 0) {
bytes4 selector = IWETH.deposit.selector;
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
mstore(0, selector)
if iszero(call(gas(), weth, amount, 0, 4, 0, 0)) {
returndatacopy(0, 0, returndatasize())
revert(0, returndatasize())
}
}
}
}
function safeWithdraw(IWETH weth, uint256 amount) internal {
bytes4 selector = IWETH.withdraw.selector;
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
mstore(0, selector)
mstore(4, amount)
if iszero(call(gas(), weth, 0, 0, 0x24, 0, 0)) {
returndatacopy(0, 0, returndatasize())
revert(0, returndatasize())
}
}
}
function safeWithdrawTo(IWETH weth, uint256 amount, address to) internal {
safeWithdraw(weth, amount);
if (to != address(this)) {
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
if iszero(call(gas(), to, amount, 0, 0, 0, 0)) {
returndatacopy(0, 0, returndatasize())
revert(0, returndatasize())
}
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
pragma abicoder v1;
import "../Errors.sol";
/**
* @title ContractOnlyEthRecipient
* @notice Base contract that rejects any direct ethereum deposits. This is a failsafe against users who can accidentaly send ether
*/
abstract contract ContractOnlyEthRecipient {
receive() external payable {
// solhint-disable-next-line avoid-tx-origin
if (msg.sender == tx.origin) {
revert DirectEthDepositIsForbidden();
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
/**
* @title ISwapExecutor
* @notice Interface for executing low level swaps, including all relevant structs and enums
*/
interface ISwapExecutor {
struct TargetSwapDescription {
uint256 tokenRatio;
address target;
bytes data;
// uint8 callType; first 8 bits
// uint8 sourceInteraction; next 8 bits
// uint32 amountOffset; next 32 bits
// address sourceTokenInteractionTarget; last 160 bits
uint256 params;
}
struct SwapDescription {
IERC20 sourceToken;
TargetSwapDescription[] swaps;
}
function executeSwap(address payable recipient, IERC20 tokenToTransfer, SwapDescription[] calldata swapDescriptions) external payable;
}
uint8 constant CALL_TYPE_DIRECT = 0;
uint8 constant CALL_TYPE_CALCULATED = 1;
uint8 constant SOURCE_TOKEN_INTERACTION_NONE = 0;
uint8 constant SOURCE_TOKEN_INTERACTION_TRANSFER = 1;
uint8 constant SOURCE_TOKEN_INTERACTION_APPROVE = 2;
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
pragma abicoder v1;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@1inch/solidity-utils/contracts/libraries/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
/**
* @title TokenLibrary
* @notice Library for basic interactions with tokens (such as deposits, withdrawals, transfers)
*/
library TokenLibrary {
using SafeMath for uint256;
using SafeERC20 for IERC20;
function isEth(IERC20 token) internal pure returns(bool) {
return address(token) == address(0) || address(token) == address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
}
function universalBalanceOf(IERC20 token, address account) internal view returns (uint256) {
if (isEth(token)) {
return account.balance;
} else {
return token.balanceOf(account);
}
}
function universalTransfer(IERC20 token, address payable to, uint256 amount) internal {
if (amount == 0) {
return;
}
if (isEth(token)) {
to.transfer(amount);
} else {
token.safeTransfer(to, amount);
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
pragma abicoder v1;
enum EnumType {
SourceTokenInteraction,
TargetTokenInteraction,
CallType
}
enum UniswapV3LikeProtocol {
Uniswap,
Kyber
}
error EthValueAmountMismatch();
error EthValueSourceTokenMismatch();
error MinReturnError(uint256, uint256);
error EmptySwapOnExecutor();
error EmptySwap();
error ZeroInput();
error ZeroRecipient();
error TransactionExpired(uint256, uint256);
error PermitNotAllowedForEthSwap();
error SwapTotalAmountCannotBeZero();
error SwapAmountCannotBeZero();
error DirectEthDepositIsForbidden();
error MStableInvalidSwapType(uint256);
error AddressCannotBeZero();
error TransferFromNotAllowed();
error EnumOutOfRangeValue(EnumType, uint256);
error BadUniswapV3LikePool(UniswapV3LikeProtocol);
// 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 v4.6.0) (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/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
pragma solidity ^0.8.0;
pragma abicoder v1;
interface IDaiLikePermit {
function permit(
address holder,
address spender,
uint256 nonce,
uint256 expiry,
bool allowed,
uint8 v,
bytes32 r,
bytes32 s
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface IPermit2 {
struct PermitDetails {
// ERC20 token address
address token;
// the maximum amount allowed to spend
uint160 amount;
// timestamp at which a spender's token allowances become invalid
uint48 expiration;
// an incrementing value indexed per owner,token,and spender for each signature
uint48 nonce;
}
/// @notice The permit message signed for a single token allownce
struct PermitSingle {
// the permit data for a single token alownce
PermitDetails details;
// address permissioned on the allowed tokens
address spender;
// deadline on the permit signature
uint256 sigDeadline;
}
/// @notice Packed allowance
struct PackedAllowance {
// amount allowed
uint160 amount;
// permission expiry
uint48 expiration;
// an incrementing value indexed per owner,token,and spender for each signature
uint48 nonce;
}
function transferFrom(address user, address spender, uint160 amount, address token) external;
function permit(address owner, PermitSingle memory permitSingle, bytes calldata signature) external;
function allowance(address user, address token, address spender) external view returns (PackedAllowance memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
pragma abicoder v1;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IWETH is IERC20 {
function deposit() external payable;
function withdraw(uint256 amount) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
pragma abicoder v1;
/// @title Revert reason forwarder.
library RevertReasonForwarder {
/// @dev Forwards latest externall call revert.
function reRevert() internal pure {
// bubble up revert reason from latest external call
/// @solidity memory-safe-assembly
assembly { // solhint-disable-line no-inline-assembly
let ptr := mload(0x40)
returndatacopy(ptr, 0, returndatasize())
revert(ptr, returndatasize())
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the subtraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// 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 (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;
}
}