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// SPDX-License-Identifier: MIT

pragma solidity 0.8.10;

import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "./interface/IProxy.sol";
import "./interface/IRegistry.sol";
import "./interface/IFeeRuleRegistry.sol";
import "./Config.sol";
import "./Storage.sol";
import "./lib/LibParam.sol";
import "./lib/LibFeeStorage.sol";

/**
 * @title The entrance of Furucombo
 * @author Ben Huang
 */
contract Proxy is IProxy, Storage, Config {
    using Address for address;
    using SafeERC20 for IERC20;
    using LibParam for bytes32;
    using LibStack for bytes32[];
    using Strings for uint256;
    using LibFeeStorage for mapping(bytes32 => bytes32);

    event LogBegin(
        address indexed handler,
        bytes4 indexed selector,
        bytes payload
    );
    event LogEnd(
        address indexed handler,
        bytes4 indexed selector,
        bytes result
    );
    event ChargeFee(address indexed tokenIn, uint256 feeAmount);

    modifier isNotBanned() {
        require(registry.bannedAgents(address(this)) == 0, "Banned");
        _;
    }

    modifier isNotHalted() {
        require(registry.fHalt() == false, "Halted");
        _;
    }

    address private constant NATIVE_TOKEN =
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    IRegistry public immutable registry;
    IFeeRuleRegistry public immutable feeRuleRegistry;

    constructor(address registry_, address feeRuleRegistry_) {
        registry = IRegistry(registry_);
        feeRuleRegistry = IFeeRuleRegistry(feeRuleRegistry_);
    }

    /**
     * @notice Direct transfer from EOA should be reverted.
     * @dev Callback function will be handled here.
     */
    fallback() external payable isNotHalted isNotBanned isInitialized {
        // If triggered by a function call, caller should be registered in
        // registry.
        // The function call will then be forwarded to the location registered
        // in registry.
        require(_isValidCaller(msg.sender), "Invalid caller");

        address target = address(bytes20(registry.callers(msg.sender)));
        bytes memory result = _exec(target, msg.data, type(uint256).max);

        // return result for aave v2 flashloan()
        uint256 size = result.length;
        assembly {
            let loc := add(result, 0x20)
            return(loc, size)
        }
    }

    /**
     * @notice Direct transfer from EOA should be reverted.
     */
    receive() external payable {
        require(Address.isContract(msg.sender), "Not allowed from EOA");
    }

    /**
     * @notice Combo execution function. Including three phases: pre-process,
     * exection and post-process.
     * @param tos The handlers of combo.
     * @param configs The configurations of executing cubes.
     * @param datas The combo datas.
     * @param ruleIndexes The indexes of rules.
     */
    function batchExec(
        address[] calldata tos,
        bytes32[] calldata configs,
        bytes[] memory datas,
        uint256[] calldata ruleIndexes
    ) external payable override isNotHalted isNotBanned {
        _preProcess(ruleIndexes);
        _execs(tos, configs, datas);
        _postProcess();
    }

    /**
     * @notice The execution interface for callback function to be executed.
     * @dev This function can only be called through the handler, which makes
     * the caller become proxy itself.
     */
    function execs(
        address[] calldata tos,
        bytes32[] calldata configs,
        bytes[] memory datas
    ) external payable override isNotHalted isNotBanned isInitialized {
        require(msg.sender == address(this), "Does not allow external calls");
        _execs(tos, configs, datas);
    }

    /**
     * @notice The execution phase.
     * @param tos The handlers of combo.
     * @param configs The configurations of executing cubes.
     * @param datas The combo datas.
     */
    function _execs(
        address[] memory tos,
        bytes32[] memory configs,
        bytes[] memory datas
    ) internal {
        bytes32[256] memory localStack;
        uint256 index;
        uint256 counter;

        require(
            tos.length == datas.length,
            "Tos and datas length inconsistent"
        );
        require(
            tos.length == configs.length,
            "Tos and configs length inconsistent"
        );
        for (uint256 i = 0; i < tos.length; i++) {
            address to = tos[i];
            bytes32 config = configs[i];
            bytes memory data = datas[i];
            // Check if the data contains dynamic parameter
            if (!config.isStatic()) {
                // If so, trim the exectution data base on the configuration and stack content
                _trim(data, config, localStack, index);
            }
            // Emit the execution log before call
            bytes4 selector = _getSelector(data);
            emit LogBegin(to, selector, data);

            // Check if the output will be referenced afterwards
            bytes memory result = _exec(to, data, counter);
            counter++;

            // Emit the execution log after call
            emit LogEnd(to, selector, result);

            if (config.isReferenced()) {
                // If so, parse the output and place it into local stack
                uint256 num = config.getReturnNum();
                uint256 newIndex = _parse(localStack, result, index);
                require(
                    newIndex == index + num,
                    "Return num and parsed return num not matched"
                );
                index = newIndex;
            }

            // Setup the process to be triggered in the post-process phase
            _setPostProcess(to);
        }
    }

    /**
     * @notice Trimming the execution data.
     * @param data The execution data.
     * @param config The configuration.
     * @param localStack The stack the be referenced.
     * @param index Current element count of localStack.
     */
    function _trim(
        bytes memory data,
        bytes32 config,
        bytes32[256] memory localStack,
        uint256 index
    ) internal pure {
        // Fetch the parameter configuration from config
        (uint256[] memory refs, uint256[] memory params) = config.getParams();
        // Trim the data with the reference and parameters
        for (uint256 i = 0; i < refs.length; i++) {
            require(refs[i] < index, "Reference to out of localStack");
            bytes32 ref = localStack[refs[i]];
            uint256 offset = params[i];
            uint256 base = PERCENTAGE_BASE;
            assembly {
                let loc := add(add(data, 0x20), offset)
                let m := mload(loc)
                // Adjust the value by multiplier if a dynamic parameter is not zero
                if iszero(iszero(m)) {
                    // Assert no overflow first
                    let p := mul(m, ref)
                    if iszero(eq(div(p, m), ref)) {
                        revert(0, 0)
                    } // require(p / m == ref)
                    ref := div(p, base)
                }
                mstore(loc, ref)
            }
        }
    }

    /**
     * @notice Parse the return data to the local stack.
     * @param localStack The local stack to place the return values.
     * @param ret The return data.
     * @param index The current tail.
     */
    function _parse(
        bytes32[256] memory localStack,
        bytes memory ret,
        uint256 index
    ) internal pure returns (uint256 newIndex) {
        uint256 len = ret.length;
        // The return value should be multiple of 32-bytes to be parsed.
        require(len % 32 == 0, "illegal length for _parse");
        // Estimate the tail after the process.
        newIndex = index + len / 32;
        require(newIndex <= 256, "stack overflow");
        assembly {
            let offset := shl(5, index)
            // Store the data into localStack
            for {
                let i := 0
            } lt(i, len) {
                i := add(i, 0x20)
            } {
                mstore(
                    add(localStack, add(i, offset)),
                    mload(add(add(ret, i), 0x20))
                )
            }
        }
    }

    /**
     * @notice The execution of a single cube.
     * @param to_ The handler of cube.
     * @param data_ The cube execution data.
     * @param counter_ The current counter of the cube.
     */
    function _exec(
        address to_,
        bytes memory data_,
        uint256 counter_
    ) internal returns (bytes memory result) {
        require(_isValidHandler(to_), "Invalid handler");
        bool success;
        assembly {
            success := delegatecall(
                sub(gas(), 5000),
                to_,
                add(data_, 0x20),
                mload(data_),
                0,
                0
            )
            let size := returndatasize()

            result := mload(0x40)
            mstore(
                0x40,
                add(result, and(add(add(size, 0x20), 0x1f), not(0x1f)))
            )
            mstore(result, size)
            returndatacopy(add(result, 0x20), 0, size)
        }

        if (!success) {
            if (result.length < 68) revert("_exec");
            assembly {
                result := add(result, 0x04)
            }

            if (counter_ == type(uint256).max) {
                revert(abi.decode(result, (string))); // Don't prepend counter
            } else {
                revert(
                    string(
                        abi.encodePacked(
                            counter_.toString(),
                            "_",
                            abi.decode(result, (string))
                        )
                    )
                );
            }
        }
    }

    /**
     * @notice Setup the post-process.
     * @param to_ The handler of post-process.
     */
    function _setPostProcess(address to_) internal {
        // If the stack length equals 0, just skip
        // If the top is a custom post-process, replace it with the handler
        // address.
        if (stack.length == 0) {
            return;
        } else if (
            stack.peek() == bytes32(bytes12(uint96(HandlerType.Custom))) &&
            bytes4(stack.peek(1)) != 0x00000000
        ) {
            stack.pop();
            stack.setAddress(to_);
            stack.setHandlerType(HandlerType.Custom);
        }
    }

    /// @notice The pre-process phase.
    function _preProcess(uint256[] memory ruleIndexes_)
        internal
        virtual
        isStackEmpty
    {
        // Set the sender.
        _setSender();
        // Set the fee collector
        cache._setFeeCollector(feeRuleRegistry.feeCollector());

        // Calculate fee
        uint256 feeRate =
            feeRuleRegistry.calFeeRateMulti(_getSender(), ruleIndexes_);
        require(feeRate <= PERCENTAGE_BASE, "fee rate out of range");
        cache._setFeeRate(feeRate);
        if (msg.value > 0 && feeRate > 0) {
            // Process ether fee
            uint256 feeEth = _calFee(msg.value, feeRate);

            // It will fail if fee collector is gnosis contract, because .transfer() will only consume 2300 gas limit.
            // Replacing .transfer() with .call('') to avoid out of gas
            address collector = cache._getFeeCollector();
            (bool success, ) = collector.call{value: feeEth}("");
            require(success, "Send fee to collector failed");
            emit ChargeFee(NATIVE_TOKEN, feeEth);
        }
    }

    /// @notice The post-process phase.
    function _postProcess() internal {
        // Handler type will be parsed at the beginning. Will send the token back to
        // user if the handler type is "Token". Will get the handler address and
        // execute the customized post-process if handler type is "Custom".
        while (stack.length > 0) {
            bytes32 top = stack.get();
            // Get handler type
            HandlerType handlerType = HandlerType(uint96(bytes12(top)));
            if (handlerType == HandlerType.Token) {
                address addr = address(uint160(uint256(top)));
                uint256 tokenAmount = IERC20(addr).balanceOf(address(this));
                if (tokenAmount > 0)
                    IERC20(addr).safeTransfer(msg.sender, tokenAmount);
            } else if (handlerType == HandlerType.Custom) {
                address addr = stack.getAddress();
                _exec(
                    addr,
                    abi.encodeWithSelector(POSTPROCESS_SIG),
                    type(uint256).max
                );
            } else {
                revert("Invalid handler type");
            }
        }

        // Balance should also be returned to user
        uint256 amount = address(this).balance;
        if (amount > 0) payable(msg.sender).transfer(amount);
        // Reset cached datas
        cache._resetFeeCollector();
        cache._resetFeeRate();
        _resetSender();
    }

    /// @notice Check if the handler is valid in registry.
    function _isValidHandler(address handler) internal view returns (bool) {
        return registry.isValidHandler(handler);
    }

    /// @notice Check if the caller is valid in registry.
    function _isValidCaller(address caller) internal view returns (bool) {
        return registry.isValidCaller(caller);
    }

    /// @notice Get payload function selector.
    function _getSelector(bytes memory payload)
        internal
        pure
        returns (bytes4 selector)
    {
        selector =
            payload[0] |
            (bytes4(payload[1]) >> 8) |
            (bytes4(payload[2]) >> 16) |
            (bytes4(payload[3]) >> 24);
    }

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

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

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

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

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

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return 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
                /// @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 (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IProxy {
    function batchExec(address[] calldata tos, bytes32[] calldata configs, bytes[] memory datas, uint256[] calldata ruleIndexes) external payable;
    function execs(address[] calldata tos, bytes32[] calldata configs, bytes[] memory datas) external payable;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IRegistry {
    function handlers(address) external view returns (bytes32);
    function callers(address) external view returns (bytes32);
    function bannedAgents(address) external view returns (uint256);
    function fHalt() external view returns (bool);
    function isValidHandler(address handler) external view returns (bool);
    function isValidCaller(address handler) external view returns (bool);
}

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

interface IFeeRuleRegistry {
    /* State Variables Getter */
    function rules(uint256) external view returns (address);
    function counter() external view returns (uint256);
    function basisFeeRate() external view returns (uint256);
    function feeCollector() external view returns (address);
    function BASE() external view returns (uint256);

    /* Restricted Functions */
    function setBasisFeeRate(uint256) external;
    function setFeeCollector(address) external;
    function registerRule(address rule) external;
    function unregisterRule(uint256 ruleIndex) external;

    /* View Functions */
    function calFeeRateMulti(address usr, uint256[] calldata ruleIndexes) external view returns (uint256 scaledRate);
    function calFeeRate(address usr, uint256 ruleIndex) external view returns (uint256 scaledRate);
    function calFeeRateMultiWithoutBasis(address usr, uint256[] calldata ruleIndexes) external view returns (uint256 scaledRate);
    function calFeeRateWithoutBasis(address usr, uint256 ruleIndex) external view returns (uint256 scaledRate);
}

// 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;

library LibParam {
    bytes32 private constant STATIC_MASK =
        0x0100000000000000000000000000000000000000000000000000000000000000;
    bytes32 private constant PARAMS_MASK =
        0x0000000000000000000000000000000000000000000000000000000000000001;
    bytes32 private constant REFS_MASK =
        0x00000000000000000000000000000000000000000000000000000000000000FF;
    bytes32 private constant RETURN_NUM_MASK =
        0x00FF000000000000000000000000000000000000000000000000000000000000;

    uint256 private constant REFS_LIMIT = 22;
    uint256 private constant PARAMS_SIZE_LIMIT = 64;
    uint256 private constant RETURN_NUM_OFFSET = 240;

    function isStatic(bytes32 conf) internal pure returns (bool) {
        if (conf & STATIC_MASK == 0) return true;
        else return false;
    }

    function isReferenced(bytes32 conf) internal pure returns (bool) {
        if (getReturnNum(conf) == 0) return false;
        else return true;
    }

    function getReturnNum(bytes32 conf) internal pure returns (uint256 num) {
        bytes32 temp = (conf & RETURN_NUM_MASK) >> RETURN_NUM_OFFSET;
        num = uint256(temp);
    }

    function getParams(bytes32 conf)
        internal
        pure
        returns (uint256[] memory refs, uint256[] memory params)
    {
        require(!isStatic(conf), "Static params");
        uint256 n = REFS_LIMIT;
        while (conf & REFS_MASK == REFS_MASK && n > 0) {
            n--;
            conf = conf >> 8;
        }
        require(n > 0, "No dynamic param");
        refs = new uint256[](n);
        params = new uint256[](n);
        for (uint256 i = 0; i < n; i++) {
            refs[i] = uint256(conf & REFS_MASK);
            conf = conf >> 8;
        }
        uint256 locCount = 0;
        for (uint256 k = 0; k < PARAMS_SIZE_LIMIT; k++) {
            if (conf & PARAMS_MASK != 0) {
                require(locCount < n, "Location count exceeds ref count");
                params[locCount] = k * 32 + 4;
                locCount++;
            }
            conf = conf >> 1;
        }
        require(locCount == n, "Location count less than ref count");
    }
}

// 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
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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 "../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];
    }
}

{
  "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":"registry_","type":"address"},{"internalType":"address","name":"feeRuleRegistry_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"tokenIn","type":"address"},{"indexed":false,"internalType":"uint256","name":"feeAmount","type":"uint256"}],"name":"ChargeFee","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"handler","type":"address"},{"indexed":true,"internalType":"bytes4","name":"selector","type":"bytes4"},{"indexed":false,"internalType":"bytes","name":"payload","type":"bytes"}],"name":"LogBegin","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"handler","type":"address"},{"indexed":true,"internalType":"bytes4","name":"selector","type":"bytes4"},{"indexed":false,"internalType":"bytes","name":"result","type":"bytes"}],"name":"LogEnd","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"MSG_SENDER_KEY","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"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":"tos","type":"address[]"},{"internalType":"bytes32[]","name":"configs","type":"bytes32[]"},{"internalType":"bytes[]","name":"datas","type":"bytes[]"},{"internalType":"uint256[]","name":"ruleIndexes","type":"uint256[]"}],"name":"batchExec","outputs":[],"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":"tos","type":"address[]"},{"internalType":"bytes32[]","name":"configs","type":"bytes32[]"},{"internalType":"bytes[]","name":"datas","type":"bytes[]"}],"name":"execs","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"feeRuleRegistry","outputs":[{"internalType":"contract IFeeRuleRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"registry","outputs":[{"internalType":"contract IRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stack","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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00000000000000000000000084faf5b559f58d651e51300c5a7d078cb964e6910000000000000000000000005be4b07ed69a4904cfe1a6d6b3e000fe070bdfcb

-----Decoded View---------------
Arg [0] : registry_ (address): 0x84Faf5b559f58d651E51300C5a7D078cb964E691
Arg [1] : feeRuleRegistry_ (address): 0x5be4B07ED69A4904CFe1a6D6B3e000fe070bdfcb

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000084faf5b559f58d651e51300c5a7d078cb964e691
Arg [1] : 0000000000000000000000005be4b07ed69a4904cfe1a6d6b3e000fe070bdfcb