Contract Address Details

// Copyright (C) 2021  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.3;

import "./BaseFilter.sol";

/**
 * @title GroWithdrawFilter
 * @notice Filter used for withdrawals from Gro Protocol
 * @author Olivier VDB - <olivier@argent.xyz>
 */
contract GroWithdrawFilter is BaseFilter {

    bytes4 private constant WITHDRAW1 = bytes4(keccak256("withdrawByStablecoin(bool,uint256,uint256,uint256)"));
    bytes4 private constant WITHDRAW2 = bytes4(keccak256("withdrawByLPToken(bool,uint256,uint256[])"));
    bytes4 private constant WITHDRAW_ALL1 = bytes4(keccak256("withdrawAllSingle(bool,uint256,uint256)"));
    bytes4 private constant WITHDRAW_ALL2 = bytes4(keccak256("withdrawAllBalanced(bool,uint256[])"));

    function isValid(address /*_wallet*/, address _spender, address _to, bytes calldata _data) external view override returns (bool valid) {
        // disable ETH transfer
        if (_data.length < 4) {
            return false;
        }

        bytes4 methodId = getMethod(_data);
        return (_spender == _to && (methodId == WITHDRAW1 || methodId == WITHDRAW_ALL1 || methodId == WITHDRAW2 || methodId == WITHDRAW_ALL2));
    }
}
        

// Copyright (C) 2021  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.3;

import "./IFilter.sol";

abstract contract BaseFilter is IFilter {
    function getMethod(bytes memory _data) internal pure returns (bytes4 method) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            method := mload(add(_data, 0x20))
        }
    }
}
          

// Copyright (C) 2021  Argent Labs Ltd. <https://argent.xyz>

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.3;

interface IFilter {
    function isValid(address _wallet, address _spender, address _to, bytes calldata _data) external view returns (bool valid);
}