Eth CTF Helpers

ctfHelpers.sol

pragma solidity ^0.4.24;


contract _useful {
    mapping (address => bool) public owners;
    
    address[] deployed;
    
    event Deployed(address d);
    event SD();
    
    modifier oo {
        require(owners[msg.sender]);
        _;
    }
    
    constructor() public payable {
        owners[msg.sender] = true;
    }
    
    function() payable public {}
    
    function addOwner(address o) external oo {
        owners[o] = true;
    }
    
    function deploy(bytes _code) public oo returns (address d) {
        assembly {
            d := create(0, add(_code, 0x20), mload(_code))
            if iszero(extcodesize(d)) { revert(0x00, 0x00) }
        }
        
        // bytes4 addOwnerSig = mkSig("addOwner(address)");
        // let's only deploy _useful contracts
        _useful(d).addOwner(msg.sender);
        deployed.push(d);
        emit Deployed(d);
    }
    
    function destroy() external oo {
        bytes4 dSig = mkSig("destroy()");
        for (uint i = 0; i < deployed.length; i++) {
            deployed[i].call(dSig);
        }
        sd();
    }
    
    function sd() public oo {
        emit SD();
        selfdestruct(msg.sender);
    }
    
    function mkSig(string s) internal returns (bytes4) {
        return bytes4(keccak256(abi.encodePacked(s)));
    }
    
    function amIOwner() external view returns (bool) {
        return owners[msg.sender];
    }
}

contract Root is _useful {
    function deployForBaseGame(address baseGame, bytes _code) external oo returns (address) {
        address d = deploy(_code);
        BaseGame(baseGame).addAuthorizedWallet(d);
    }
}

contract BaseGame{
    uint256 public contractBalance;
    function addAuthorizedWallet(address _wallet) external;
}