从DelegateCall读取值

Question

我想用openzeppelin的AccessControl实现一个白名单。假设我有以下设置：

合同A:它正在做一些事情，但只对那些被白名单的用户。

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract ContractA is ERC20, Ownable {
address _whitelist;

constructor(
    address whitelist,
) ERC20("ContractA", "CTRCT") {
    _whitelist = whitelist;
    ...
}

function checkRoleWithDelegateCall(address someUser) public returns (bool) {
    (bool success, bytes memory result) = _whitelist.delegatecall(abi.encodeWithSignature("hasRole(bytes32,address)", "ROLE_WHITELIST", someUser));
    return abi.decode(result, (bool));
} 


function doSomething(address[] memory someUsers) public onlyOwner {
    // Abort the transaction if a chosen user is not on the whitelist.
    for(uint256 i = 0; i < recipients.length; i++) {
        require(checkRoleWithDelegateCall(recipients[i]), "At least one recipient is not on the whitelist");
    }
     <<some irrelevant code >>   
}}

合同白名单:它管理白名单，也就是说，它存储用户是否在白名单上：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/access/Ownable.sol";


contract Whitelist is AccessControl, Ownable {

// Create a new role that allows accounts with that role to trade bonds
bytes32 public constant ROLE_WHITELIST = keccak256("ROLE_WHITELISTE");

constructor() {
    _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
}

function grantWhitelistingRole(address[] memory someUsers) public onlyRole(DEFAULT_ADMIN_ROLE) {
    bytes32 role = BOND_WHITELISTED_ROLE;
    for (uint i=0; i<accounts.length; i++) {
        grantRole(role, accounts[i]);
    }
}}

我首先部署白名单契约，并将其地址传递给ContractA的部署。然后，我将ROLE_WHITELIST授予userA，它根据我所做的测试工作。但是，当我用硬帽子测试doSomething函数时，它就不起作用了:契约A不将userA解释为拥有ROLE_WHITELIST，并从require语句返回“至少有一个收件人不在白名单上”。

可以这样做吗？如果没有，那么更好的方法是什么呢？

提前感谢！

Answer 1

问题在于Keccak-256散列: ROLE_WHITELIST必须作为ROLE_WHITELIST =keccak256("ROLE_WHITELIST")在checkRoleWithDelegateCall中使用。