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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.21;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable2Step.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./lib/DexExecutor.sol";
import "./lib/Helper.sol";

// Be careful this contract contains unsafe call !.
// Do not approve token or just approve the right amount before call it.
// Clear approve in the same transaction if calling failed.
contract SwapAdapter is Ownable2Step, ReentrancyGuard {
    using Address for address;
    using SafeERC20 for IERC20;

    struct Param {
        address srcToken;
        address dstToken;
        address receiver;
        address leftReceiver;
        uint256 minAmount;
        SwapData[] swaps;
    }

    struct SwapData {
        uint8 dexType;
        address callTo;
        address approveTo;
        uint256 fromAmount;
        bytes callData;
    }

    event SwapComplete(
        address indexed from,
        address indexed srcToken,
        uint256 indexed inputAmount,
        address outToken,
        uint256 outAmount,
        address receiver
    );

    constructor(address _owner) {
        require(_owner != Helper.ZERO_ADDRESS, "ButterAgg: zero addr");
        _transferOwnership(_owner);
    }

    // Not recommended for EOA call with token approve
    // Approve the amount you want to trade.
    // DexType 0 - AGG, 1 - UNIV2, 2 - UNIV3, 3 - CURVE
    function swap(Param calldata params) external payable nonReentrant returns (uint256 outAmount) {
        require(params.swaps.length > 0, "ButterAgg: empty swap data");

        (uint256 amount, uint256 initInputTokenBalance) = _depositToken(params.srcToken);
        uint256 finalTokenAmount = Helper._getBalance(params.dstToken, address(this));
        (uint256 amountAdjust, uint256 firstAdjust, bool isUp) = _reBuildSwaps(amount, params.swaps);
        bool isFirst = true;
        SwapData[] memory _swaps = params.swaps;
        for (uint256 i = 0; i < _swaps.length; i++) {
            if (_swaps[i].dexType > 0 && amountAdjust > 0) {
                if (isFirst) {
                    isUp ? _swaps[i].fromAmount += firstAdjust : _swaps[i].fromAmount -= firstAdjust;
                    isFirst = false;
                } else {
                    isUp ? _swaps[i].fromAmount += amountAdjust : _swaps[i].fromAmount -= amountAdjust;
                }
            }
            bool isNative = Helper._isNative(params.srcToken);
            if (!isNative) {
                IERC20(params.srcToken).safeApprove(_swaps[i].approveTo, 0);
                IERC20(params.srcToken).safeApprove(_swaps[i].approveTo, _swaps[i].fromAmount);
            }
            DexExecutor.execute(
                _swaps[i].dexType,
                _swaps[i].callTo,
                params.srcToken,
                params.dstToken,
                _swaps[i].fromAmount,
                _swaps[i].callData
            );
            if (!isNative) {
                IERC20(params.srcToken).safeApprove(_swaps[i].approveTo, 0);
            }
        }
        outAmount = Helper._getBalance(params.dstToken, address(this)) - finalTokenAmount;
        require(outAmount >= params.minAmount, "ButterAgg: swap received too low");
        uint256 left = Helper._getBalance(params.srcToken, address(this)) - initInputTokenBalance;
        if (left > 0) {
            Helper._transfer(params.srcToken, params.leftReceiver, left);
        }
        address receiver = params.receiver == address(0) ? msg.sender : params.receiver;
        Helper._transfer(params.dstToken, receiver, outAmount);
        emit SwapComplete(msg.sender, params.srcToken, amount, params.dstToken, outAmount, receiver);
    }

    function _depositToken(address _token) private returns (uint256 amount, uint256 initInputTokenBalance) {
        initInputTokenBalance = Helper._getBalance(_token, address(this));
        if (Helper._isNative(_token)) {
            initInputTokenBalance -= msg.value;
            amount = msg.value;
        } else {
            amount = IERC20(_token).allowance(msg.sender, address(this));
            SafeERC20.safeTransferFrom(IERC20(_token), msg.sender, address(this), amount);
        }
        require(amount > 0, "ButterAgg: zero input");
    }

    function _reBuildSwaps(
        uint256 _amount,
        SwapData[] memory _swaps
    ) private pure returns (uint256 amountAdjust, uint256 firstAdjust, bool isUp) {
        uint256 total = 0;
        uint256 count = 0;
        for (uint256 i = 0; i < _swaps.length; i++) {
            total += _swaps[i].fromAmount;
            if (_swaps[i].dexType > 0) {
                count++;
            }
        }
        if (total > _amount) {
            require(count > 0, "ButterAgg: cannot adjust");
            isUp = false;
            uint256 margin = total - _amount;
            amountAdjust = margin / count;
            firstAdjust = amountAdjust + (margin - amountAdjust * count);
        } else if (total < _amount) {
            if (count > 0) {
                isUp = true;
                uint256 margin = _amount - total;
                amountAdjust = margin / count;
                firstAdjust = amountAdjust + (margin - amountAdjust * count);
            }
        }
    }

    function rescueFunds(address _token, address _receiver, uint256 _amount) external onlyOwner {
        require(_receiver != address(0));
        Helper._transfer(_token, _receiver, _amount);
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

// EIP-2612 is Final as of 2022-11-01. This file is deprecated.

import "./IERC20Permit.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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 v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/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
pragma solidity 0.8.21;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "./Helper.sol";

library DexExecutor {
    using SafeERC20 for IERC20;

    enum DexType {
        AGG,
        UNIV2,
        UNIV3,
        CURVE,
        FILL,
        MIX
    }

    function execute(
        uint8 _dexType,
        address _router,
        address _srcToken,
        address _dstToken,
        uint256 _amount,
        bytes memory _swap
    ) internal {
        bool _result;
        bool _isNative = Helper._isNative(_srcToken);
        DexType dexType = DexType(_dexType);
        if (dexType == DexType.AGG) {
            (_result) = _makeAggSwap(_router, _amount, _isNative, _swap);
        } else if (dexType == DexType.UNIV2) {
            (_result) = _makeUniV2Swap(_router, _dstToken, _amount, _isNative, _swap);
        } else if (dexType == DexType.UNIV3) {
            (_result) = _makeUniV3Swap(_router, _dstToken, _amount, _isNative, _swap);
        } else if (dexType == DexType.CURVE) {
            (_result) = _makeCurveSwap(_router, _amount, _isNative, _swap);
        } else if (dexType == DexType.FILL) {
            (_result) = _makeAggFill(_router, _amount, _isNative, _swap);
        } else if (dexType == DexType.MIX) {
            (_result) = _makeMixSwap(_srcToken, _amount, _swap);
        } else {
            require(false, "DexExecutor: unsupported dex type");
        }
        require(_result, "DexExecutor: swap fail");
    }

    struct MixSwap {
        uint256 offset;
        address srcToken;
        address callTo;
        address approveTo;
        bytes callData;
    }

    function _makeMixSwap(address _srcToken, uint256 _amount, bytes memory _swap) internal returns (bool _result) {
        MixSwap[] memory mixSwaps = abi.decode(_swap, (MixSwap[]));
        for (uint256 i = 0; i < mixSwaps.length; i++) {
            if (i != 0) {
                _amount = Helper._getBalance(mixSwaps[i].srcToken, address(this));
                _srcToken = mixSwaps[i].srcToken;
            }
            bytes memory callDatas = mixSwaps[i].callData;
            uint256 offset = mixSwaps[i].offset;
            if (offset != 0) {
                assembly {
                    mstore(add(callDatas, offset), _amount)
                }
            }
            if (Helper._isNative(_srcToken)) {
                (_result, ) = mixSwaps[i].callTo.call{value: _amount}(callDatas);
            } else {
                if (i != 0) {
                    IERC20(_srcToken).safeIncreaseAllowance(mixSwaps[i].approveTo, _amount);
                }

                (_result, ) = mixSwaps[i].callTo.call(callDatas);

                if (i != 0) {
                    IERC20(_srcToken).safeApprove(mixSwaps[i].approveTo, 0);
                }
            }
            if (!_result) {
                break;
            }
        }
    }

    function _makeAggSwap(
        address _router,
        uint256 _amount,
        bool _isNative,
        bytes memory _swap
    ) internal returns (bool _result) {
        if (_isNative) {
            (_result, ) = _router.call{value: _amount}(_swap);
        } else {
            (_result, ) = _router.call(_swap);
        }
    }

    function _makeAggFill(
        address _router,
        uint256 _amount,
        bool _isNative,
        bytes memory _swap
    ) internal returns (bool _result) {
        (uint256 offset, bytes memory callDatas) = abi.decode(_swap, (uint256, bytes));
        assembly {
            mstore(add(callDatas, offset), _amount)
        }
        if (_isNative) {
            (_result, ) = _router.call{value: _amount}(callDatas);
        } else {
            (_result, ) = _router.call(callDatas);
        }
    }

    function _makeUniV2Swap(
        address _router,
        address _dstToken,
        uint256 _amount,
        bool _isNative,
        bytes memory _swap
    ) internal returns (bool _result) {
        (uint256 amountOutMin, address[] memory path) = abi.decode(_swap, (uint256, address[]));
        if (_isNative) {
            (_result, ) = _router.call{value: _amount}(
                abi.encodeWithSignature(
                    "swapExactETHForTokens(uint256,address[],address,uint256)",
                    amountOutMin,
                    path,
                    address(this),
                    block.timestamp + 100
                )
            );
        } else if (Helper._isNative(_dstToken)) {
            (_result, ) = _router.call(
                abi.encodeWithSignature(
                    "swapExactTokensForETH(uint256,uint256,address[],address,uint256)",
                    _amount,
                    amountOutMin,
                    path,
                    address(this),
                    block.timestamp + 100
                )
            );
        } else {
            (_result, ) = _router.call(
                abi.encodeWithSignature(
                    "swapExactTokensForTokens(uint256,uint256,address[],address,uint256)",
                    _amount,
                    amountOutMin,
                    path,
                    address(this),
                    block.timestamp + 100
                )
            );
        }
    }

    struct ExactInputParams {
        bytes path;
        address recipient;
        uint256 amountIn;
        uint256 amountOutMinimum;
    }

    function _makeUniV3Swap(
        address _router,
        address _dstToken,
        uint256 _amount,
        bool _isNative,
        bytes memory _swap
    ) internal returns (bool _result) {
        (uint256 amountOutMin, bytes memory path) = abi.decode(_swap, (uint256, bytes));

        address receiver = Helper._isNative(_dstToken) ? _router : address(this);
        ExactInputParams memory params = ExactInputParams(path, receiver, _amount, amountOutMin);
        bytes memory swapData = abi.encodeWithSignature("exactInput((bytes,address,uint256,uint256))", params);
        uint256 value = _isNative ? _amount : 0;
        if (Helper._isNative(_dstToken)) {
            bytes[] memory c = new bytes[](2);
            c[0] = swapData;
            c[1] = abi.encodeWithSignature("unwrapWETH9(uint256,address)", amountOutMin, address(this));
            (_result, ) = _router.call{value: value}(abi.encodeWithSignature("multicall(bytes[])", c));
        } else {
            (_result, ) = _router.call{value: value}(swapData);
        }
    }

    function _makeCurveSwap(
        address _router,
        uint256 _amount,
        bool _isNative,
        bytes memory _swap
    ) internal returns (bool _result) {
        (uint256 expected, address[9] memory routes, uint256[3][4] memory swap_params, address[4] memory pools) = abi
            .decode(_swap, (uint256, address[9], uint256[3][4], address[4]));
        uint256 value = _isNative ? _amount : 0;

        (_result, ) = _router.call{value: value}(
            abi.encodeWithSignature(
                "exchange_multiple(address[9],uint256[3][4],uint256,uint256,address[4],address)",
                routes,
                swap_params,
                _amount,
                expected,
                pools,
                address(this)
            )
        );
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.21;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";

library Helper {
    using SafeERC20 for IERC20;
    address internal constant ZERO_ADDRESS = address(0);
    address internal constant NATIVE_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    struct CallbackParam {
        address target;
        address approveTo;
        uint256 offset;
        uint256 extraNativeAmount;
        address receiver;
        bytes data;
    }

    struct SwapParam {
        uint8 dexType;
        address executor;
        address approveTo;
        address receiver;
        address dstToken;
        uint256 minReturnAmount;
        bytes data;
    }

    function _isNative(address token) internal pure returns (bool) {
        return (token == ZERO_ADDRESS || token == NATIVE_ADDRESS);
    }

    function _getBalance(address _token, address _account) internal view returns (uint256) {
        if (_isNative(_token)) {
            return _account.balance;
        } else {
            return IERC20(_token).balanceOf(_account);
        }
    }

    function _transfer(address _token, address _to, uint256 _amount) internal {
        if (_isNative(_token)) {
            Address.sendValue(payable(_to), _amount);
        } else {
            IERC20(_token).safeTransfer(_to, _amount);
        }
    }

    function _safeWithdraw(address _wToken, uint _value) internal returns (bool) {
        (bool success, bytes memory data) = _wToken.call(abi.encodeWithSelector(0x2e1a7d4d, _value));
        return (success && (data.length == 0 || abi.decode(data, (bool))));
    }

    function _getFirst4Bytes(bytes memory data) internal pure returns (bytes4 outBytes4) {
        if (data.length == 0) {
            return 0x0;
        }
        assembly {
            outBytes4 := mload(add(data, 32))
        }
    }

    function _makeSwap(
        uint256 _amount,
        address _srcToken,
        SwapParam memory _swap
    ) internal returns (bool _result, address _dstToken, uint256 _returnAmount) {
        _dstToken = _swap.dstToken;
        uint256 nativeValue = 0;
        bool isNative = Helper._isNative(_srcToken);
        if (isNative) {
            nativeValue = _amount;
        } else {
            IERC20(_srcToken).safeApprove(_swap.approveTo, 0);
            IERC20(_srcToken).safeApprove(_swap.approveTo, _amount);
        }
        _returnAmount = Helper._getBalance(_dstToken, address(this));

        (_result, ) = _swap.executor.call{value: nativeValue}(_swap.data);

        _returnAmount = Helper._getBalance(_dstToken, address(this)) - _returnAmount;

        if (!isNative) {
            IERC20(_srcToken).safeApprove(_swap.approveTo, 0);
        }
    }

    function _callBack(
        uint256 _amount,
        address _token,
        CallbackParam memory _callParam
    ) internal returns (bool _result, uint256 _callAmount) {
        _callAmount = Helper._getBalance(_token, address(this));
        uint256 offset = _callParam.offset;
        bytes memory callDatas = _callParam.data;
        if (offset != 0) {
            assembly {
                mstore(add(callDatas, offset), _amount)
            }
        }
        if (Helper._isNative(_token)) {
            (_result, ) = _callParam.target.call{value: _amount}(callDatas);
        } else {
            if (_amount != 0) IERC20(_token).safeIncreaseAllowance(_callParam.approveTo, _amount);
            // this contract not save money make sure send value can cover this
            (_result, ) = _callParam.target.call{value: _callParam.extraNativeAmount}(callDatas);
            if (_amount != 0) IERC20(_token).safeApprove(_callParam.approveTo, 0);
        }
        _callAmount = _callAmount - Helper._getBalance(_token, address(this));
    }

    function _permit(bytes memory _data) internal {
        (
            address token,
            address owner,
            address spender,
            uint256 value,
            uint256 deadline,
            uint8 v,
            bytes32 r,
            bytes32 s
        ) = abi.decode(_data, (address, address, address, uint256, uint256, uint8, bytes32, bytes32));

        SafeERC20.safePermit(IERC20Permit(token), owner, spender, value, deadline, v, r, s);
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"srcToken","type":"address"},{"indexed":true,"internalType":"uint256","name":"inputAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"outToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"outAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"receiver","type":"address"}],"name":"SwapComplete","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"rescueFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"srcToken","type":"address"},{"internalType":"address","name":"dstToken","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"address","name":"leftReceiver","type":"address"},{"internalType":"uint256","name":"minAmount","type":"uint256"},{"components":[{"internalType":"uint8","name":"dexType","type":"uint8"},{"internalType":"address","name":"callTo","type":"address"},{"internalType":"address","name":"approveTo","type":"address"},{"internalType":"uint256","name":"fromAmount","type":"uint256"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct SwapAdapter.SwapData[]","name":"swaps","type":"tuple[]"}],"internalType":"struct SwapAdapter.Param","name":"params","type":"tuple"}],"name":"swap","outputs":[{"internalType":"uint256","name":"outAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000df3f1ee5baf55055980887aad79f6fe6e3302d93

-----Decoded View---------------
Arg [0] : _owner (address): 0xdf3f1Ee5BAF55055980887AaD79F6fE6e3302D93

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000df3f1ee5baf55055980887aad79f6fe6e3302d93