Contract 0xb67f86850d3ee15f3e844d5e987da5712cb589d3 11

 
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0x43e8d5e5faacc8bf246940a4ebece68f30436bf48f84e6066be633464192352b0x60806040314747942022-10-21 8:04:53524 days 1 hr ago0xbcb909975715dc8fde643ee44b89e3fd6a35a259 IN  Create: HFunds0 ETH0.0006591 0.1
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0xb69027c2a768b44c36f28c7181a33d59a70235d26c0416f5869697181dfb4940667856902023-03-04 20:07:12389 days 13 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x22e13bcdfc5af3362cf07e406e0aa141f9b626a66f70898a8599813c693ca7ab667852292023-03-04 20:04:59389 days 13 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x4da463bb5753707d72f55060ae1422a0c67018e59ec7ccf98e23bb8c3d437509666916442023-03-04 12:50:25389 days 20 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xd6a422fbec324304c95207b2f73ecb984ebfb8cff690bd2d524f83cdac2bc2a7666906972023-03-04 12:46:09389 days 20 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x44525c606be779c03b2f2cf30ded807c7c60b2244511e538b29690fd9dd0fc50666895482023-03-04 12:40:58389 days 20 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x70a814c9eed76248434d18bd43e3c555054998414303395212a9543037e911f2662349842023-03-03 2:16:43391 days 7 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x70a814c9eed76248434d18bd43e3c555054998414303395212a9543037e911f2662349842023-03-03 2:16:43391 days 7 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x79e255717fc52fbe73bba0b9f5f4623f0504a9956d1def6e55cc6c11a0d8e62b659059722023-03-02 1:31:04392 days 7 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x06c6bd26c6b57b291126e878d8079c44d086ed27aee0f4f40bd331f3e08f9bc5655085642023-02-28 19:25:44393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x4a267fd2f1f194fe7d9bdd41fdd9d08115b3c8883d1b699cb6feca8b96cb5425655064532023-02-28 19:16:08393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x4a267fd2f1f194fe7d9bdd41fdd9d08115b3c8883d1b699cb6feca8b96cb5425655064532023-02-28 19:16:08393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x4a267fd2f1f194fe7d9bdd41fdd9d08115b3c8883d1b699cb6feca8b96cb5425655064532023-02-28 19:16:08393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xfa39918aed1d98e6442aaa6e1cba45a4381a106679108ef0da859a6eb485d8a2655012432023-02-28 18:51:30393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xd59dc1ea92c483f8cac14ddd2003e545309b768d3508bdc55aa50dbcf9380d7b655003192023-02-28 18:47:12393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xd59dc1ea92c483f8cac14ddd2003e545309b768d3508bdc55aa50dbcf9380d7b655003192023-02-28 18:47:12393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xd59dc1ea92c483f8cac14ddd2003e545309b768d3508bdc55aa50dbcf9380d7b655003192023-02-28 18:47:12393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x8df8a1aec870632cf4997ab4e7a7d63c0659941306a04a2a858097087cfe7092654975202023-02-28 18:34:22393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x8df8a1aec870632cf4997ab4e7a7d63c0659941306a04a2a858097087cfe7092654975202023-02-28 18:34:22393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x8df8a1aec870632cf4997ab4e7a7d63c0659941306a04a2a858097087cfe7092654975202023-02-28 18:34:22393 days 14 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xc2f6f6d5f037ba86342b0dbc1e0701a4b3077bffad398cd9075ba94b6b942369644114182023-02-25 10:51:17396 days 22 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xc2f6f6d5f037ba86342b0dbc1e0701a4b3077bffad398cd9075ba94b6b942369644114182023-02-25 10:51:17396 days 22 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x30cd46b73e716137c59489aede0ddcb6321d736b1de512415e18c29dcf7acdd2640095622023-02-24 5:44:08398 days 3 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x30cd46b73e716137c59489aede0ddcb6321d736b1de512415e18c29dcf7acdd2640095622023-02-24 5:44:08398 days 3 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0xabdb4070fe85499847d63420b96b0b6eb465e98ad3299b16a40e0d788e722a0e640093592023-02-24 5:43:16398 days 3 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
0x213d1d25886af8f93a8f968d399681ede120163a0f135017ae8d808064526314638449822023-02-23 17:18:42398 days 16 hrs ago Furucombo: Proxy V2.2.0 Furucombo: Funds Handlers0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
HFunds

Compiler Version
v0.8.10+commit.fc410830

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 11 : HFunds.sol
// 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; i++) {
            address token = tokens[i];
            if (token != address(0) && token != NATIVE_TOKEN_ADDRESS) {
                // Update involved token
                _updateToken(token);
            }
            balances[i] = _getBalance(token, type(uint256).max);
        }
        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; i++) {
            uint256 amount = _getBalance(tokens[i], amounts[i]);
            if (amount > 0) {
                // ETH case
                if (
                    tokens[i] == address(0) || tokens[i] == NATIVE_TOKEN_ADDRESS
                ) {
                    receiver.transfer(amount);
                } else {
                    IERC20(tokens[i]).safeTransfer(receiver, amount);
                }
            }
        }
    }

    function send(uint256 amount, address payable receiver) external payable {
        amount = _getBalance(address(0), amount);
        if (amount > 0) {
            receiver.transfer(amount);
        }
    }

    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) {
            block.coinbase.transfer(amount);
        }
    }

    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; i++) {
            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);
            }
        }
    }

    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; i++) {
            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]);
        }
        return amountsInProxy;
    }

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

File 2 of 11 : SafeERC20.sol
// 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");
        }
    }
}

File 3 of 11 : LibFeeStorage.sol
// 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);
    }
}

File 4 of 11 : HandlerBase.sol
// 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);
    }
}

File 5 of 11 : IERC20.sol
// 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);
}

File 6 of 11 : Address.sol
// 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);
            }
        }
    }
}

File 7 of 11 : LibCache.sol
// 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];
    }
}

File 8 of 11 : Storage.sol
// 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);
    }
}

File 9 of 11 : LibStack.sol
// 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];
    }
}

File 10 of 11 : Config.sol
// 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}
}

File 11 of 11 : IERC20Usdt.sol
// 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);
}

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

Contract 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":"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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