Contract 0x7F974c1E969c8201c08273b958dA646fe5d536AA 7

// SPDX-License-Identifier: MIT

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 ^0.8.0;

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");
        }
    }
}

// SPDX-License-Identifier: MIT

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

pragma solidity ^0.8.0;

contract Config {
    // function signature of "postProcess()"
    bytes4 public constant POSTPROCESS_SIG = 0xc2722916;

    // The base amount of percentage function
    uint256 public constant PERCENTAGE_BASE = 1 ether;

    // Handler post-process type. Others should not happen now.
    enum HandlerType {
        Token,
        Custom,
        Others
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./lib/LibCache.sol";
import "./lib/LibStack.sol";

/// @notice A cache structure composed by a bytes32 array
contract Storage {
    using LibCache for mapping(bytes32 => bytes32);
    using LibStack for bytes32[];

    bytes32[] public stack;
    mapping(bytes32 => bytes32) public cache;

    // keccak256 hash of "msg.sender"
    // prettier-ignore
    bytes32 public constant MSG_SENDER_KEY = 0xb2f2618cecbbb6e7468cc0f2aa43858ad8d153e0280b22285e28e853bb9d453a;

    modifier isStackEmpty() {
        require(stack.length == 0, "Stack not empty");
        _;
    }

    modifier isInitialized() {
        require(_getSender() != address(0), "Sender is not initialized");
        _;
    }

    modifier isNotInitialized() {
        require(_getSender() == address(0), "Sender is initialized");
        _;
    }

    function _setSender() internal isNotInitialized {
        cache.setAddress(MSG_SENDER_KEY, msg.sender);
    }

    function _resetSender() internal {
        cache.setAddress(MSG_SENDER_KEY, address(0));
    }

    function _getSender() internal view returns (address) {
        return cache.getAddress(MSG_SENDER_KEY);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interface/IERC20Usdt.sol";

import "../Config.sol";
import "../Storage.sol";

abstract contract HandlerBase is Storage, Config {
    using SafeERC20 for IERC20;
    using LibStack for bytes32[];

    address public constant NATIVE_TOKEN_ADDRESS =
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    function postProcess() external payable virtual {
        revert("Invalid post process");
        /* Implementation template
        bytes4 sig = stack.getSig();
        if (sig == bytes4(keccak256(bytes("handlerFunction_1()")))) {
            // Do something
        } else if (sig == bytes4(keccak256(bytes("handlerFunction_2()")))) {
            bytes32 temp = stack.get();
            // Do something
        } else revert("Invalid post process");
        */
    }

    function _updateToken(address token) internal {
        stack.setAddress(token);
        // Ignore token type to fit old handlers
        // stack.setHandlerType(uint256(HandlerType.Token));
    }

    function _updatePostProcess(bytes32[] memory params) internal {
        for (uint256 i = params.length; i > 0; i--) {
            stack.set(params[i - 1]);
        }
        stack.set(msg.sig);
        stack.setHandlerType(HandlerType.Custom);
    }

    function getContractName() public pure virtual returns (string memory);

    function _revertMsg(
        string memory functionName,
        string memory reason
    ) internal pure {
        revert(
            string(
                abi.encodePacked(
                    getContractName(),
                    "_",
                    functionName,
                    ": ",
                    reason
                )
            )
        );
    }

    function _revertMsg(string memory functionName) internal pure {
        _revertMsg(functionName, "Unspecified");
    }

    function _requireMsg(
        bool condition,
        string memory functionName,
        string memory reason
    ) internal pure {
        if (!condition) _revertMsg(functionName, reason);
    }

    function _uint2String(uint256 n) internal pure returns (string memory) {
        if (n == 0) {
            return "0";
        } else {
            uint256 len = 0;
            for (uint256 temp = n; temp > 0; temp /= 10) {
                len++;
            }
            bytes memory str = new bytes(len);
            for (uint256 i = len; i > 0; i--) {
                str[i - 1] = bytes1(uint8(48 + (n % 10)));
                n /= 10;
            }
            return string(str);
        }
    }

    function _getBalance(
        address token,
        uint256 amount
    ) internal view returns (uint256) {
        if (amount != type(uint256).max) {
            return amount;
        }

        // ETH case
        if (token == address(0) || token == NATIVE_TOKEN_ADDRESS) {
            return address(this).balance;
        }
        // ERC20 token case
        return IERC20(token).balanceOf(address(this));
    }

    function _tokenApprove(
        address token,
        address spender,
        uint256 amount
    ) internal {
        try IERC20Usdt(token).approve(spender, amount) {} catch {
            IERC20(token).safeApprove(spender, 0);
            IERC20(token).safeApprove(spender, amount);
        }
    }

    function _tokenApproveZero(address token, address spender) internal {
        if (IERC20Usdt(token).allowance(address(this), spender) > 0) {
            try IERC20Usdt(token).approve(spender, 0) {} catch {
                IERC20Usdt(token).approve(spender, 1);
            }
        }
    }

    function _isNotNativeToken(address token) internal pure returns (bool) {
        return (token != address(0) && token != NATIVE_TOKEN_ADDRESS);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.10;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../../lib/LibFeeStorage.sol";
import "../HandlerBase.sol";

contract HFunds is HandlerBase {
    using SafeERC20 for IERC20;
    using LibFeeStorage for mapping(bytes32 => bytes32);

    event ChargeFee(address indexed tokenIn, uint256 feeAmount);

    function getContractName() public pure override returns (string memory) {
        return "HFunds";
    }

    function updateTokens(
        address[] calldata tokens
    ) external payable returns (uint256[] memory) {
        uint256[] memory balances = new uint256[](tokens.length);
        for (uint256 i = 0; i < tokens.length; ) {
            address token = tokens[i];
            if (token != address(0) && token != NATIVE_TOKEN_ADDRESS) {
                // Update involved token
                _updateToken(token);
            }
            balances[i] = _getBalance(token, type(uint256).max);
            unchecked {
                ++i;
            }
        }
        return balances;
    }

    function inject(
        address[] calldata tokens,
        uint256[] calldata amounts
    ) external payable returns (uint256[] memory) {
        return _inject(tokens, amounts);
    }

    // Same as inject() and just to make another interface for different use case
    function addFunds(
        address[] calldata tokens,
        uint256[] calldata amounts
    ) external payable returns (uint256[] memory) {
        return _inject(tokens, amounts);
    }

    function sendTokens(
        address[] calldata tokens,
        uint256[] calldata amounts,
        address payable receiver
    ) external payable {
        for (uint256 i = 0; i < tokens.length; ) {
            uint256 amount = _getBalance(tokens[i], amounts[i]);
            if (amount > 0) {
                // ETH case
                if (
                    tokens[i] == address(0) || tokens[i] == NATIVE_TOKEN_ADDRESS
                ) {
                    (bool success, ) = receiver.call{value: amount}("");
                    _requireMsg(success, "sendTokens", "failed to send Ether");
                } else {
                    IERC20(tokens[i]).safeTransfer(receiver, amount);
                }
            }
            unchecked {
                ++i;
            }
        }
    }

    function sendTokenToAddresses(
        address token,
        uint256[] calldata amounts,
        address payable[] calldata receivers
    ) external payable {
        _requireMsg(
            amounts.length == receivers.length,
            "sendTokenToAddresses",
            "amount and receiver does not match"
        );
        if (_isNotNativeToken(token)) {
            for (uint256 i = 0; i < amounts.length; ) {
                if (amounts[i] > 0) {
                    IERC20(token).safeTransfer(receivers[i], amounts[i]);
                }
                unchecked {
                    ++i;
                }
            }
        } else {
            for (uint256 i = 0; i < amounts.length; ) {
                if (amounts[i] > 0) {
                    (bool success, ) = receivers[i].call{value: amounts[i]}("");
                    _requireMsg(
                        success,
                        "sendTokenToAddresses",
                        "failed to send Ether"
                    );
                }
                unchecked {
                    ++i;
                }
            }
        }
    }

    function send(uint256 amount, address payable receiver) external payable {
        amount = _getBalance(address(0), amount);
        if (amount > 0) {
            (bool success, ) = receiver.call{value: amount}("");
            _requireMsg(success, "send", "failed to send Ether");
        }
    }

    function sendToken(
        address token,
        uint256 amount,
        address receiver
    ) external payable {
        amount = _getBalance(token, amount);
        if (amount > 0) {
            IERC20(token).safeTransfer(receiver, amount);
        }
    }

    /// @notice Send ether to block miner.
    /// @dev Transfer with built-in 2300 gas cap is safer and acceptable for most miners.
    /// @param amount The ether amount.
    function sendEtherToMiner(uint256 amount) external payable {
        if (amount > 0) {
            (bool success, ) = block.coinbase.call{value: amount}("");
            _requireMsg(success, "sendEtherToMiner", "failed to send Ether");
        }
    }

    function checkSlippage(
        address[] calldata tokens,
        uint256[] calldata amounts
    ) external payable {
        _requireMsg(
            tokens.length == amounts.length,
            "checkSlippage",
            "token and amount do not match"
        );

        for (uint256 i = 0; i < tokens.length; ) {
            if (tokens[i] == address(0)) {
                if (address(this).balance < amounts[i]) {
                    string memory errMsg = string(
                        abi.encodePacked(
                            "error: ",
                            _uint2String(i),
                            "_",
                            _uint2String(address(this).balance)
                        )
                    );
                    _revertMsg("checkSlippage", errMsg);
                }
            } else if (
                IERC20(tokens[i]).balanceOf(address(this)) < amounts[i]
            ) {
                string memory errMsg = string(
                    abi.encodePacked(
                        "error: ",
                        _uint2String(i),
                        "_",
                        _uint2String(IERC20(tokens[i]).balanceOf(address(this)))
                    )
                );

                _revertMsg("checkSlippage", errMsg);
            }
            unchecked {
                ++i;
            }
        }
    }

    function getBalance(address token) external payable returns (uint256) {
        return _getBalance(token, type(uint256).max);
    }

    function _inject(
        address[] calldata tokens,
        uint256[] calldata amounts
    ) internal returns (uint256[] memory) {
        _requireMsg(
            tokens.length == amounts.length,
            "inject",
            "token and amount does not match"
        );
        address sender = _getSender();
        uint256 feeRate = cache._getFeeRate();
        address collector = cache._getFeeCollector();
        uint256[] memory amountsInProxy = new uint256[](amounts.length);

        for (uint256 i = 0; i < tokens.length; ) {
            IERC20(tokens[i]).safeTransferFrom(
                sender,
                address(this),
                amounts[i]
            );
            if (feeRate > 0) {
                uint256 fee = _calFee(amounts[i], feeRate);
                IERC20(tokens[i]).safeTransfer(collector, fee);
                amountsInProxy[i] = amounts[i] - fee;
                emit ChargeFee(tokens[i], fee);
            } else {
                amountsInProxy[i] = amounts[i];
            }

            // Update involved token
            _updateToken(tokens[i]);

            unchecked {
                ++i;
            }
        }
        return amountsInProxy;
    }

    function _calFee(
        uint256 amount,
        uint256 feeRate
    ) internal pure returns (uint256) {
        return (amount * feeRate) / PERCENTAGE_BASE;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IERC20Usdt {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external;

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external;

    function transferFrom(address sender, address recipient, uint256 amount) external;

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

library LibCache {
    function set(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key,
        bytes32 _value
    ) internal {
        _cache[_key] = _value;
    }

    function setAddress(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key,
        address _value
    ) internal {
        _cache[_key] = bytes32(uint256(uint160(_value)));
    }

    function setUint256(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key,
        uint256 _value
    ) internal {
        _cache[_key] = bytes32(_value);
    }

    function getAddress(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key
    ) internal view returns (address ret) {
        ret = address(uint160(uint256(_cache[_key])));
    }

    function getUint256(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key
    ) internal view returns (uint256 ret) {
        ret = uint256(_cache[_key]);
    }

    function get(
        mapping(bytes32 => bytes32) storage _cache,
        bytes32 _key
    ) internal view returns (bytes32 ret) {
        ret = _cache[_key];
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./LibCache.sol";
import "../Storage.sol";

library LibFeeStorage {
    using LibCache for mapping(bytes32 => bytes32);

    // keccak256 hash of "furucombo.fee.rate"
    // prettier-ignore
    bytes32 public constant FEE_RATE_KEY = 0x142183525227cae0e4300fd0fc77d7f3b08ceb0fd9cb2a6c5488668fa0ea5ffa;

    // keccak256 hash of "furucombo.fee.collector"
    // prettier-ignore
    bytes32 public constant FEE_COLLECTOR_KEY = 0x60d7a7cc0a45d852bd613e4f527aaa2e4b81fff918a69a2aab88b6458751d614;

    function _setFeeRate(
        mapping(bytes32 => bytes32) storage _cache,
        uint256 _feeRate
    ) internal {
        require(_getFeeRate(_cache) == 0, "Fee rate not zero");
        _cache.setUint256(FEE_RATE_KEY, _feeRate);
    }

    function _resetFeeRate(
        mapping(bytes32 => bytes32) storage _cache
    ) internal {
        _cache.setUint256(FEE_RATE_KEY, 0);
    }

    function _getFeeRate(
        mapping(bytes32 => bytes32) storage _cache
    ) internal view returns (uint256) {
        return _cache.getUint256(FEE_RATE_KEY);
    }

    function _setFeeCollector(
        mapping(bytes32 => bytes32) storage _cache,
        address _collector
    ) internal {
        require(
            _getFeeCollector(_cache) == address(0),
            "Fee collector is initialized"
        );
        _cache.setAddress(FEE_COLLECTOR_KEY, _collector);
    }

    function _resetFeeCollector(
        mapping(bytes32 => bytes32) storage _cache
    ) internal {
        _cache.setAddress(FEE_COLLECTOR_KEY, address(0));
    }

    function _getFeeCollector(
        mapping(bytes32 => bytes32) storage _cache
    ) internal view returns (address) {
        return _cache.getAddress(FEE_COLLECTOR_KEY);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../Config.sol";

library LibStack {
    function setAddress(bytes32[] storage _stack, address _input) internal {
        _stack.push(bytes32(uint256(uint160(_input))));
    }

    function set(bytes32[] storage _stack, bytes32 _input) internal {
        _stack.push(_input);
    }

    function setHandlerType(
        bytes32[] storage _stack,
        Config.HandlerType _input
    ) internal {
        _stack.push(bytes12(uint96(_input)));
    }

    function getAddress(
        bytes32[] storage _stack
    ) internal returns (address ret) {
        ret = address(uint160(uint256(peek(_stack))));
        _stack.pop();
    }

    function getSig(bytes32[] storage _stack) internal returns (bytes4 ret) {
        ret = bytes4(peek(_stack));
        _stack.pop();
    }

    function get(bytes32[] storage _stack) internal returns (bytes32 ret) {
        ret = peek(_stack);
        _stack.pop();
    }

    function peek(
        bytes32[] storage _stack
    ) internal view returns (bytes32 ret) {
        uint256 length = _stack.length;
        require(length > 0, "stack empty");
        ret = _stack[length - 1];
    }

    function peek(
        bytes32[] storage _stack,
        uint256 _index
    ) internal view returns (bytes32 ret) {
        uint256 length = _stack.length;
        require(length > 0, "stack empty");
        require(length > _index, "not enough elements in stack");
        ret = _stack[length - _index - 1];
    }
}

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

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"tokenIn","type":"address"},{"indexed":false,"internalType":"uint256","name":"feeAmount","type":"uint256"}],"name":"ChargeFee","type":"event"},{"inputs":[],"name":"MSG_SENDER_KEY","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"NATIVE_TOKEN_ADDRESS","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERCENTAGE_BASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"POSTPROCESS_SIG","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"addFunds","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"cache","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"checkSlippage","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"getBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"getContractName","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"inject","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"postProcess","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address payable","name":"receiver","type":"address"}],"name":"send","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"sendEtherToMiner","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"receiver","type":"address"}],"name":"sendToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"address payable[]","name":"receivers","type":"address[]"}],"name":"sendTokenToAddresses","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address[]","name":"tokens","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"address payable","name":"receiver","type":"address"}],"name":"sendTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stack","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"tokens","type":"address[]"}],"name":"updateTokens","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"payable","type":"function"}]

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