// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                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 {
    /**
     * @notice This function returns the address of the sender of the message.
     * @dev This function is an internal view function that returns the address of the sender of the message.
     */
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    /**
     * @notice _msgData() is an internal view function that returns the calldata of the message.
     * @dev This function is used to access the calldata of the message.
     */
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;
import "@openzeppelin/contracts-0.8/access/Ownable.sol";
import { IERC20 } from "@openzeppelin/contracts-0.8/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts-0.8/token/ERC20/utils/SafeERC20.sol";
import { Multicall3 } from "./Multicall3.sol";

/**
 *  @title KeeperMulticall3
 *  @notice Aggregate results from multiple function calls
 *  @dev Aggregate methods are marked `payable` to save 24 gas per call
 *  @author Aura Finance
 */
contract KeeperMulticall3 is Multicall3, Ownable {
    using SafeERC20 for IERC20;

    mapping(address => bool) public authorizedKeepers;

    constructor(address _owner) {
        _transferOwnership(_owner);
    }

    /// @notice Adds or remove an address from the harvesters' whitelist
    /// @param _harvester address of the authorized harvester
    /// @param _authorized Whether to add or remove harvester
    function updateAuthorizedKeepers(address _harvester, bool _authorized) external onlyOwner {
        authorizedKeepers[_harvester] = _authorized;
    }

    /* -------------------------------------------------------------------
       Modifiers 
    ------------------------------------------------------------------- */

    modifier onlyKeeper() {
        require(authorizedKeepers[msg.sender], "!keeper");
        _;
    }

    /// @notice Aggregate calls, ensuring each returns success if required
    /// @param calls An array of Call3 structs
    /// @return returnData An array of Result structs
    function aggregate3(Call3[] calldata calls)
        public
        payable
        virtual
        override
        onlyKeeper
        returns (Result[] memory returnData)
    {
        return super.aggregate3(calls);
    }

    /// @notice Aggregate calls with a msg value
    /// @notice Reverts if msg.value is less than the sum of the call values
    /// @param calls An array of Call3Value structs
    /// @return returnData An array of Result structs
    function aggregate3Value(Call3Value[] calldata calls)
        public
        payable
        virtual
        override
        onlyKeeper
        returns (Result[] memory returnData)
    {
        return super.aggregate3Value(calls);
    }

    /// @notice Aggregate calls with a msg value previously funded
    /// @notice It requires to fund this contract previous to any call.
    /// @param calls An array of Call3Value structs
    /// @return returnData An array of Result structs
    function aggregate3Funded(Call3Value[] calldata calls)
        public
        payable
        virtual
        override
        onlyKeeper
        returns (Result[] memory returnData)
    {
        return super.aggregate3Funded(calls);
    }

    function recoverEthBalance() external onlyOwner {
        address addr = address(this);
        (bool sent, ) = payable(owner()).call{ value: getEthBalance(addr) }("");
        require(sent, "!refund");
    }

    function recoverERC20(address _tokenAddress, uint256 _tokenAmount) external onlyOwner {
        IERC20(_tokenAddress).safeTransfer(owner(), _tokenAmount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;

/**
 *  @title Multicall3
 *  @notice Aggregate results from multiple function calls
 *  @dev Aggregate methods are marked `payable` to save 24 gas per call
 *  @dev Original implementation https://raw.githubusercontent.com/mds1/multicall/main/src/Multicall3.sol
 *  @dev Aura fork removes all backwards-compatible methods and add funded functions.
 *  @author Michael Elliot <mike@makerdao.com>
 *  @author Joshua Levine <joshua@makerdao.com>
 *  @author Nick Johnson <arachnid@notdot.net>
 *  @author Andreas Bigger <andreas@nascent.xyz>
 *  @author Matt Solomon <matt@mattsolomon.dev>
 */
contract Multicall3 {
    /* ==========     STRUCTS     ========== */

    struct Call3 {
        address target;
        bool allowFailure;
        bytes callData;
    }

    struct Call3Value {
        address target;
        bool allowFailure;
        uint256 value;
        bytes callData;
    }

    struct Result {
        bool success;
        bytes returnData;
    }

    /// @notice Aggregate calls, ensuring each returns success if required
    /// @param calls An array of Call3 structs
    /// @return returnData An array of Result structs
    function aggregate3(Call3[] calldata calls) public payable virtual returns (Result[] memory returnData) {
        uint256 length = calls.length;
        returnData = new Result[](length);
        Call3 calldata calli;
        for (uint256 i = 0; i < length; ) {
            Result memory result = returnData[i];
            calli = calls[i];
            (result.success, result.returnData) = calli.target.call(calli.callData);
            assembly {
                // Revert if the call fails and failure is not allowed
                // `allowFailure := calldataload(add(calli, 0x20))` and `success := mload(result)`
                if iszero(or(calldataload(add(calli, 0x20)), mload(result))) {
                    // set "Error(string)" signature: bytes32(bytes4(keccak256("Error(string)")))
                    mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
                    // set data offset
                    mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)
                    // set length of revert string
                    mstore(0x24, 0x0000000000000000000000000000000000000000000000000000000000000017)
                    // set revert string: bytes32(abi.encodePacked("Multicall3: call failed"))
                    mstore(0x44, 0x4d756c746963616c6c333a2063616c6c206661696c6564000000000000000000)
                    revert(0x00, 0x64)
                }
            }
            unchecked {
                ++i;
            }
        }
    }

    /// @notice Aggregate calls with a msg value
    /// @notice Reverts if msg.value is less than the sum of the call values
    /// @param calls An array of Call3Value structs
    /// @return returnData An array of Result structs
    function aggregate3Value(Call3Value[] calldata calls) public payable virtual returns (Result[] memory returnData) {
        uint256 valAccumulator;
        uint256 length = calls.length;
        returnData = new Result[](length);
        Call3Value calldata calli;
        for (uint256 i = 0; i < length; ) {
            Result memory result = returnData[i];
            calli = calls[i];
            uint256 val = calli.value;
            // Humanity will be a Type V Kardashev Civilization before this overflows - andreas
            // ~ 10^25 Wei in existence << ~ 10^76 size uint fits in a uint256
            unchecked {
                valAccumulator += val;
            }
            (result.success, result.returnData) = calli.target.call{ value: val }(calli.callData);
            assembly {
                // Revert if the call fails and failure is not allowed
                // `allowFailure := calldataload(add(calli, 0x20))` and `success := mload(result)`
                if iszero(or(calldataload(add(calli, 0x20)), mload(result))) {
                    // set "Error(string)" signature: bytes32(bytes4(keccak256("Error(string)")))
                    mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
                    // set data offset
                    mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)
                    // set length of revert string
                    mstore(0x24, 0x0000000000000000000000000000000000000000000000000000000000000017)
                    // set revert string: bytes32(abi.encodePacked("Multicall3: call failed"))
                    mstore(0x44, 0x4d756c746963616c6c333a2063616c6c206661696c6564000000000000000000)
                    revert(0x00, 0x84)
                }
            }
            unchecked {
                ++i;
            }
        }
        // Finally, make sure the msg.value = SUM(call[0...i].value)
        require(msg.value == valAccumulator, "Multicall3: value mismatch");
    }

    /// @notice Aggregate calls with a msg value previously funded
    /// @notice It requires to fund this contract previous to any call.
    /// @param calls An array of Call3Value structs
    /// @return returnData An array of Result structs
    function aggregate3Funded(Call3Value[] calldata calls) public payable virtual returns (Result[] memory returnData) {
        uint256 valAccumulator;
        uint256 length = calls.length;
        returnData = new Result[](length);
        Call3Value calldata calli;
        for (uint256 i = 0; i < length; ) {
            Result memory result = returnData[i];
            calli = calls[i];
            uint256 val = calli.value;
            // Humanity will be a Type V Kardashev Civilization before this overflows - andreas
            // ~ 10^25 Wei in existence << ~ 10^76 size uint fits in a uint256
            unchecked {
                valAccumulator += val;
            }
            (result.success, result.returnData) = calli.target.call{ value: val }(calli.callData);
            assembly {
                // Revert if the call fails and failure is not allowed
                // `allowFailure := calldataload(add(calli, 0x20))` and `success := mload(result)`
                if iszero(or(calldataload(add(calli, 0x20)), mload(result))) {
                    // set "Error(string)" signature: bytes32(bytes4(keccak256("Error(string)")))
                    mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
                    // set data offset
                    mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)
                    // set length of revert string
                    mstore(0x24, 0x0000000000000000000000000000000000000000000000000000000000000017)
                    // set revert string: bytes32(abi.encodePacked("Multicall3: call failed"))
                    mstore(0x44, 0x4d756c746963616c6c333a2063616c6c206661696c6564000000000000000000)
                    revert(0x00, 0x84)
                }
            }
            unchecked {
                ++i;
            }
        }
    }

    /// @notice Returns the block hash for the given block number
    /// @param blockNumber The block number
    function getBlockHash(uint256 blockNumber) public view returns (bytes32 blockHash) {
        blockHash = blockhash(blockNumber);
    }

    /// @notice Returns the block number
    function getBlockNumber() public view returns (uint256 blockNumber) {
        blockNumber = block.number;
    }

    /// @notice Returns the block coinbase
    function getCurrentBlockCoinbase() public view returns (address coinbase) {
        coinbase = block.coinbase;
    }

    /// @notice Returns the block difficulty
    function getCurrentBlockDifficulty() public view returns (uint256 difficulty) {
        difficulty = block.difficulty;
    }

    /// @notice Returns the block gas limit
    function getCurrentBlockGasLimit() public view returns (uint256 gaslimit) {
        gaslimit = block.gaslimit;
    }

    /// @notice Returns the block timestamp
    function getCurrentBlockTimestamp() public view returns (uint256 timestamp) {
        timestamp = block.timestamp;
    }

    /// @notice Returns the (ETH) balance of a given address
    function getEthBalance(address addr) public view returns (uint256 balance) {
        balance = addr.balance;
    }

    /// @notice Returns the block hash of the last block
    function getLastBlockHash() public view returns (bytes32 blockHash) {
        unchecked {
            blockHash = blockhash(block.number - 1);
        }
    }

    /// @notice Gets the base fee of the given block
    /// @notice Can revert if the BASEFEE opcode is not implemented by the given chain
    function getBasefee() public view returns (uint256 basefee) {
        basefee = block.basefee;
    }

    /// @notice Returns the chain id
    function getChainId() public view returns (uint256 chainid) {
        chainid = block.chainid;
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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));
        }
    }

    /**
     * @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");
        }
    }
}

{
  "compilationTarget": {
    "contracts/peripheral/KeeperMulticall3.sol": "KeeperMulticall3"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "remappings": []
}