gistfile1.txt

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

// Interface to access storage of Safe contracts
interface IStorageAccessible {
    function getStorageAt(uint256 offset, uint256 length) external view returns (bytes memory);
}

library GuardReader {
    // Storage slot for the guard address in a Gnosis Safe contract (from GuardManager.sol)
    bytes32 constant GUARD_STORAGE_SLOT = 0x4a204f620c8c5ccdca3fd54d003badd85ba500436a431f0cbda4f558c93c34c8;

    /**
     * @notice Reads the guard address directly from a Safe's storage.
     * @dev This is necessary for Safe v1.4.1 which does not have a public `getGuard()` function.
     * @param safeAddress The address of the Gnosis Safe contract.
     * @return guardAddress The address of the guard, or the zero address if none is set or if the call fails.
     */
    function getGuard(address safeAddress) internal view returns (address guardAddress) {
        try IStorageAccessible(safeAddress).getStorageAt(uint256(GUARD_STORAGE_SLOT), 1) returns (bytes memory guardBytes) {
            if (guardBytes.length == 32) {
                assembly {
                    guardAddress := mload(add(guardBytes, 32))
                }
            }
        } catch {
            // If the call fails for any reason, return the zero address.
            return address(0);
        }
    }
}