tornado-contracts/contracts/Governance/v4-exploit-patch/AdminUpgradeableProxy.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { TransparentUpgradeableProxy } from '@openzeppelin/contracts-v3/proxy/TransparentUpgradeableProxy.sol';

/**
 * @dev TransparentUpgradeableProxy where admin is allowed to call implementation methods.
 */
contract AdminUpgradeableProxy is TransparentUpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy backed by the implementation at `_logic`.
     */
    constructor(
        address _logic,
        address _admin,
        bytes memory _data
    ) public payable TransparentUpgradeableProxy(_logic, _admin, _data) {}

    /**
     * @dev Override to allow admin access the fallback function.
     */
    function _beforeFallback() internal override {}
}