用户自行领取空投的合约功能模块使用说明、部署及开源

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所属分类：币安BSC

一、说明

1. 合约可以针对指定的币种做提现设置，设置允许提现的最大及最小数量，提现手续费，是否关闭提现币种，set接口为changeConfig

2. 如果是提现BNB，可以针对不同的用户设置提现批次，不同的批次设置最大提现比例，同时可以设置是否启用关闭该批次，set接口为setMine

3. 提供增加用户余额接口，用户充值时调用该接口，增加用户针对特定币种的余额，余额数据直接保存到链上

4. 领取代币空投的方法为claim，可以支持领取WETH及任意ERC20币种。但是领取之前要对需要领取的币种有余额，即合约中tokenAmount[currency][msg.sender]要有余额值

5. 可以设置冻结账号，一旦账号被冻结，无法提现任何币种

6. 合约预留了相关的查询接口：

a. 提现的WETH币种

b. 提现的币种配置情况

c. 用户持有的提现币种余额

d. 用户所属的提现批次

7. 可以使用该合约的claim功能，让用户自主领取空投，用户自行承担交易gas费用。

8. 该合约可以作为代币充提的接口使用，由用户自行承担提现手续费，避免了dapp中的签名验签的复杂校验

二、合约部署及开源

1、设置编译器相关的参数

设置编译器版本：0818

启用优化，默认200级别优化

2、部署合约

a. 选择metamask钱包，显示当前连接的链ID，及部署合约的钱包地址和持有的BNB余额

b. 选择要部署的目标合约，此处选择BabMine

合约部署完成后，根据控制台的输出hash值，链上确认合约部署状态，同时查询合约地址，执行后续的开源操作

3、开源合约

选择单文件方式开源：single file

选择与编译时参数一致的配置，完成合约开源即可，开源后效果如下：

三、核心代码如下

1、合约所有权控制模块：

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).将合同所有权转移到新帐户（`newOwner`）。
     * Can only be called by the current owner.只能由当前所有者调用。
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

2、ETH安全转账模块

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

3、封装WETH功能模块

interface IWETH {

    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
    function balanceOf(address account) external view returns (uint256);
}

四、完整版本的合约代码如下