通过CREATE2获得合约地址：解决交易所充值账号

内容简介：本文巧妙的利用 CREATE2 为用户生成一个还为创建的合约作为充值地址，并在需要归集代币时，同时完成创建合约、转移代币及销毁合约，通过同时完成创建和销毁可以归集费用。本文参与登链社区写作激励计划 ，好文好收益，欢迎正在阅读的你也加入。

transfer()

keccak256 (0xff ++ address ++ salt ++ keccak256 (init_code)) [12:]

constructor () {
    address hotWallet = 0x …;
    address token = 0x …;
    token.transfer (hotWallet, token.balanceOf (address(this)));
    selfdestruct (address (0));
}

keccak256 (0xff ++ fabric_addr ++ hash (user_id) ++ keccak256 (wallet_init_code)) [12:]

function deployWallet (uint256 salt) {
    bytes memory walletBytecode = …;
    // 用充值钱包合约的字节码及 salt 调用 CREATE2 
}

// Note that this is not the production code
pragma solidity 0.5.6;

import "./IERC20.sol";

contract Wallet {
    address internal token = 0x123...<hot_wallet_addr>;
    address internal hotWallet = 0x321...<hot_wallet_addr>;

    constructor() public {
        // send all tokens from this contract to hotwallet
        IERC20(token).transfer(
            hotWallet,
            IERC20(token).balanceOf(address(this))
        );
        // selfdestruct to receive gas refund and reset nonce to 0
        selfdestruct(address(0x0));
    }
}

contract Fabric {
    function createContract(uint256 salt) public {
        // get wallet init_code
        bytes memory bytecode = type(Wallet).creationCode;
        assembly {
            let codeSize := mload(bytecode) // get size of init_bytecode
            let newAddr := create2(
                0, // 0 wei
                add(bytecode, 32), // the bytecode itself starts at the second slot. The first slot contains array length
                codeSize, // size of init_code
                salt // salt from function arguments
            )
        }
    }
}

transfer()

keccak256 (0xff ++ address ++ salt ++ keccak256 (init_code)) [12:]

constructor () {
    address hotWallet = 0x …;
    address token = 0x …;
    token.transfer (hotWallet, token.balanceOf (address(this)));
    selfdestruct (address (0));
}

keccak256 (0xff ++ fabric_addr ++ hash (user_id) ++ keccak256 (wallet_init_code)) [12:]

function deployWallet (uint256 salt) {
    bytes memory walletBytecode = …;
    // 用充值钱包合约的字节码及 salt 调用 CREATE2 
}

// Note that this is not the production code
pragma solidity 0.5.6;

import "./IERC20.sol";

contract Wallet {
    address internal token = 0x123...<hot_wallet_addr>;
    address internal hotWallet = 0x321...<hot_wallet_addr>;

    constructor() public {
        // send all tokens from this contract to hotwallet
        IERC20(token).transfer(
            hotWallet,
            IERC20(token).balanceOf(address(this))
        );
        // selfdestruct to receive gas refund and reset nonce to 0
        selfdestruct(address(0x0));
    }
}

contract Fabric {
    function createContract(uint256 salt) public {
        // get wallet init_code
        bytes memory bytecode = type(Wallet).creationCode;
        assembly {
            let codeSize := mload(bytecode) // get size of init_bytecode
            let newAddr := create2(
                0, // 0 wei
                add(bytecode, 32), // the bytecode itself starts at the second slot. The first slot contains array length
                codeSize, // size of init_code
                salt // salt from function arguments
            )
        }
    }
}

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