OwnableMulticall.sol

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.13;

// ============ External Imports ============

import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {Call} from "./Call.sol";

function _call(Call[] memory calls, bytes[] memory callbacks)
    returns (bytes[] memory resolveCalls)
{
    resolveCalls = new bytes[](callbacks.length);
    for (uint256 i = 0; i < calls.length; i++) {
        (bool success, bytes memory returnData) = calls[i].to.call(
            calls[i].data
        );
        require(success, "Multicall: call failed");
        resolveCalls[i] = bytes.concat(callbacks[i], returnData);
    }
}

// TODO: deduplicate
function _proxyCallBatch(address to, bytes[] memory calls) {
    for (uint256 i = 0; i < calls.length; i += 1) {
        (bool success, bytes memory returnData) = to.call(calls[i]);
        if (!success) {
            assembly {
                revert(add(returnData, 32), returnData)
            }
        }
    }
}

/*
 * @title OwnableMulticall
 * @dev Allows only only address to execute calls to other contracts
 */
contract OwnableMulticall is OwnableUpgradeable {
    constructor() {
        _transferOwnership(msg.sender);
    }

    function initialize() external initializer {
        __Ownable_init();
    }

    function proxyCalls(Call[] calldata calls) external onlyOwner {
        for (uint256 i = 0; i < calls.length; i += 1) {
            (bool success, bytes memory returnData) = calls[i].to.call(
                calls[i].data
            );
            if (!success) {
                assembly {
                    revert(add(returnData, 32), returnData)
                }
            }
        }
    }
}