444 lines
17 KiB
Solidity
444 lines
17 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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/**
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* @title XICPresale
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* @notice NAC XIC Token Presale Contract — 购买即时发放版本 v2
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* @dev 用户支付 USDT 后，XIC 代币在同一笔交易内立即转入用户钱包
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*
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* 核心参数：
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* - 预售总量：2,500,000,000 XIC（25亿）
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* - 价格：$0.02 USDT / XIC
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* - 预售硬顶：$50,000,000 USDT（5000万）
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* - 无最小/最大单笔限制
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* - 预售时长：180天（半年），到期自动停止
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* - 预售结束后未售出 XIC 可由 Owner 回收
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* - 支持 USDT 和 BNB 两种支付方式
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*
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* 合约关联：
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* - XIC Token: 0x59FF34dD59680a7125782b1f6df2A86ed46F5A24
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* - BSC USDT: 0x55d398326f99059fF775485246999027B3197955
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*/
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interface IERC20 {
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function transfer(address to, uint256 amount) external returns (bool);
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function transferFrom(address from, address to, uint256 amount) external returns (bool);
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function balanceOf(address account) external view returns (uint256);
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function allowance(address owner, address spender) external view returns (uint256);
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function decimals() external view returns (uint8);
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}
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interface IPriceOracle {
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function getBNBPrice() external view returns (uint256); // BNB/USD price, 18 decimals
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}
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contract XICPresale {
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// ─── Constants ─────────────────────────────────────────────────────────────
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uint256 public constant PRESALE_DURATION = 180 days; // 预售时长：半年
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// ─── State Variables ───────────────────────────────────────────────────────
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address public owner;
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address public wallet; // USDT/BNB 收款钱包地址
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IERC20 public immutable xicToken; // XIC 代币合约
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IERC20 public immutable usdt; // BSC USDT 合约
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// 价格：$0.02 USDT per XIC（18 decimals 精度）
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uint256 public tokenPrice = 2e16; // 0.02 * 1e18
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// 预售总量：25亿 XIC
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uint256 public hardCap = 2_500_000_000 * 1e18;
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// 预售时间
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uint256 public presaleStartTime; // 预售开始时间（Unix 时间戳）
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uint256 public presaleEndTime; // 预售结束时间（= startTime + 180 days）
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bool public presaleStarted; // 是否已启动
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// 预售状态（Owner 可手动暂停/恢复）
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bool public presalePaused = false;
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// 统计
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uint256 public totalTokensSold; // 已售 XIC 总量（18 decimals）
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uint256 public totalRaised; // 已筹 USDT 总量（6 decimals）
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// 用户购买记录
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mapping(address => uint256) public userPurchases; // 用户购买的 XIC 总量
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mapping(address => uint256) public userSpent; // 用户花费的 USDT 总量
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// BNB 价格预言机
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address public priceOracle;
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// ─── Events ────────────────────────────────────────────────────────────────
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event PresaleStarted(uint256 startTime, uint256 endTime);
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event PresalePaused(bool paused);
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event PresaleEnded(uint256 totalSold, uint256 totalRaised);
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event TokensPurchased(
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address indexed buyer,
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uint256 usdtAmount,
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uint256 tokenAmount,
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string paymentMethod
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);
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event UnsoldTokensRecovered(uint256 amount);
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event WalletChanged(address newWallet);
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event TokenPriceChanged(uint256 newPrice);
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event HardCapChanged(uint256 newHardCap);
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event EmergencyWithdraw(address token, uint256 amount);
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// ─── Modifiers ─────────────────────────────────────────────────────────────
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modifier onlyOwner() {
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require(msg.sender == owner, "Presale: caller is not owner");
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_;
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}
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modifier whenActive() {
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require(presaleStarted, "Presale: not started yet");
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require(!presalePaused, "Presale: presale is paused");
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require(block.timestamp <= presaleEndTime, "Presale: presale has ended");
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require(totalTokensSold < hardCap, "Presale: hard cap reached");
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_;
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}
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modifier afterPresale() {
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require(
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presaleStarted && (block.timestamp > presaleEndTime || totalTokensSold >= hardCap),
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"Presale: presale still active"
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);
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_;
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}
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// ─── Constructor ───────────────────────────────────────────────────────────
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/**
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* @param _xicToken XIC 代币合约地址
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* @param _usdt BSC USDT 合约地址
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* @param _wallet 收款钱包地址（接收 USDT 和 BNB）
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* @param _oracle BNB 价格预言机地址（可为 address(0) 表示不支持 BNB 购买）
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*/
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constructor(
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address _xicToken,
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address _usdt,
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address _wallet,
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address _oracle
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) {
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require(_xicToken != address(0), "Invalid XIC token address");
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require(_usdt != address(0), "Invalid USDT address");
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require(_wallet != address(0), "Invalid wallet address");
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owner = msg.sender;
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xicToken = IERC20(_xicToken);
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usdt = IERC20(_usdt);
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wallet = _wallet;
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priceOracle = _oracle;
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}
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// ─── Owner: Start Presale ──────────────────────────────────────────────────
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/**
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* @notice 启动预售（Owner 调用一次，之后自动计时 180 天）
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* @dev 调用前请确保合约已持有足够的 XIC（至少 25亿 XIC）
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*/
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function startPresale() external onlyOwner {
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require(!presaleStarted, "Presale: already started");
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uint256 xicBalance = xicToken.balanceOf(address(this));
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require(xicBalance >= hardCap, "Presale: insufficient XIC in contract");
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presaleStarted = true;
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presaleStartTime = block.timestamp;
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presaleEndTime = block.timestamp + PRESALE_DURATION;
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emit PresaleStarted(presaleStartTime, presaleEndTime);
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}
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/**
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* @notice 暂停 / 恢复预售（紧急情况使用）
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*/
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function setPaused(bool _paused) external onlyOwner {
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presalePaused = _paused;
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emit PresalePaused(_paused);
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}
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// ─── Core Purchase Functions ───────────────────────────────────────────────
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/**
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* @notice 用 USDT 购买 XIC（即时发放）
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* @param usdtAmount USDT 数量（6 decimals，例如 100 USDT = 100_000_000）
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*
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* 购买流程：
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* 1. 用户调用 USDT.approve(presaleAddress, usdtAmount)
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* 2. 调用此函数
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* 3. 合约将 USDT 从用户转入 wallet
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* 4. 合约立即将 XIC 转入用户钱包
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*/
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function buyWithUSDT(uint256 usdtAmount) external whenActive {
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require(usdtAmount > 0, "Presale: amount must be > 0");
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// 将 USDT (6d) 转换为 18d 精度，再计算 XIC 数量
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// XIC = usdtAmount * 1e12 * 1e18 / tokenPrice
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uint256 tokenAmount = (usdtAmount * 1e12 * 1e18) / tokenPrice;
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require(tokenAmount > 0, "Presale: token amount too small");
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require(
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totalTokensSold + tokenAmount <= hardCap,
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"Presale: exceeds hard cap"
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);
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// 检查合约 XIC 余额
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require(
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xicToken.balanceOf(address(this)) >= tokenAmount,
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"Presale: insufficient XIC in contract"
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);
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// 检查用户 USDT 授权和余额
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require(
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usdt.allowance(msg.sender, address(this)) >= usdtAmount,
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"Presale: insufficient USDT allowance"
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);
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require(
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usdt.balanceOf(msg.sender) >= usdtAmount,
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"Presale: insufficient USDT balance"
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);
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// 1. 收取 USDT → wallet
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require(
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usdt.transferFrom(msg.sender, wallet, usdtAmount),
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"Presale: USDT transfer failed"
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);
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// 2. 立即发放 XIC → 买家
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require(
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xicToken.transfer(msg.sender, tokenAmount),
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"Presale: XIC transfer failed"
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);
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// 更新统计
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totalTokensSold += tokenAmount;
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totalRaised += usdtAmount;
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userPurchases[msg.sender] += tokenAmount;
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userSpent[msg.sender] += usdtAmount;
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emit TokensPurchased(msg.sender, usdtAmount, tokenAmount, "USDT");
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}
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/**
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* @notice 用 BNB 购买 XIC（即时发放）
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* @dev 需要价格预言机，直接发送 BNB 到合约地址也可触发
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*/
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function buyWithBNB() external payable whenActive {
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require(msg.value > 0, "Presale: BNB amount must be > 0");
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require(priceOracle != address(0), "Presale: BNB purchase not supported");
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uint256 bnbPriceUSD = IPriceOracle(priceOracle).getBNBPrice();
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require(bnbPriceUSD > 0, "Presale: invalid BNB price");
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// BNB 价值（18d）→ XIC 数量
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uint256 usdValue18 = (msg.value * bnbPriceUSD) / 1e18;
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uint256 tokenAmount = (usdValue18 * 1e18) / tokenPrice;
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require(tokenAmount > 0, "Presale: token amount too small");
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require(
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totalTokensSold + tokenAmount <= hardCap,
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"Presale: exceeds hard cap"
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);
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require(
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xicToken.balanceOf(address(this)) >= tokenAmount,
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"Presale: insufficient XIC in contract"
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);
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// 1. 转发 BNB → wallet
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(bool bnbOk, ) = wallet.call{value: msg.value}("");
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require(bnbOk, "Presale: BNB transfer to wallet failed");
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// 2. 立即发放 XIC → 买家
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require(
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xicToken.transfer(msg.sender, tokenAmount),
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"Presale: XIC transfer failed"
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);
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// 等值 USDT（6d）用于统计
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uint256 usdtEquiv = usdValue18 / 1e12;
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totalTokensSold += tokenAmount;
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totalRaised += usdtEquiv;
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userPurchases[msg.sender] += tokenAmount;
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userSpent[msg.sender] += usdtEquiv;
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emit TokensPurchased(msg.sender, usdtEquiv, tokenAmount, "BNB");
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}
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// ─── Post-Presale: Recover Unsold Tokens ──────────────────────────────────
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/**
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* @notice 预售结束后，Owner 回收合约内未售出的 XIC
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* @dev 只能在预售结束后（超时或售罄）调用
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*/
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function recoverUnsoldTokens() external onlyOwner afterPresale {
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uint256 remaining = xicToken.balanceOf(address(this));
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require(remaining > 0, "Presale: no unsold tokens to recover");
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require(
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xicToken.transfer(owner, remaining),
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"Presale: recovery transfer failed"
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);
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emit UnsoldTokensRecovered(remaining);
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emit PresaleEnded(totalTokensSold, totalRaised);
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}
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// ─── View Functions ────────────────────────────────────────────────────────
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/**
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* @notice 计算指定 USDT 金额可购买的 XIC 数量
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* @param usdtAmount USDT 金额（6 decimals）
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*/
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function calculateTokenAmount(uint256 usdtAmount) external view returns (uint256) {
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return (usdtAmount * 1e12 * 1e18) / tokenPrice;
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}
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/**
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* @notice 计算指定 BNB 金额可购买的 XIC 数量
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*/
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function calculateTokenAmountForBNB(uint256 bnbAmount) external view returns (uint256) {
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if (priceOracle == address(0)) return 0;
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uint256 bnbPriceUSD = IPriceOracle(priceOracle).getBNBPrice();
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if (bnbPriceUSD == 0) return 0;
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uint256 usdValue18 = (bnbAmount * bnbPriceUSD) / 1e18;
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return (usdValue18 * 1e18) / tokenPrice;
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}
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/**
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* @notice 合约当前持有的 XIC 余额（可售量）
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*/
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function availableXIC() external view returns (uint256) {
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return xicToken.balanceOf(address(this));
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}
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/**
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* @notice 预售进度（已售 / 硬顶，basis points 0-10000）
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*/
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function presaleProgress() external view returns (
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uint256 sold,
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uint256 cap,
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uint256 progressBps
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) {
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sold = totalTokensSold;
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cap = hardCap;
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progressBps = cap > 0 ? (sold * 10000) / cap : 0;
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}
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/**
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* @notice 预售剩余时间（秒）
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*/
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function timeRemaining() external view returns (uint256) {
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if (!presaleStarted || block.timestamp >= presaleEndTime) return 0;
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return presaleEndTime - block.timestamp;
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}
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/**
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* @notice 预售是否当前可购买
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*/
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function isPresaleActive() external view returns (bool) {
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return presaleStarted
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&& !presalePaused
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&& block.timestamp <= presaleEndTime
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&& totalTokensSold < hardCap;
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}
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/**
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* @notice 获取 BNB 当前价格（USD，18 decimals）
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*/
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function getBNBPrice() external view returns (uint256) {
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if (priceOracle == address(0)) return 0;
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return IPriceOracle(priceOracle).getBNBPrice();
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}
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// ─── Owner Admin Functions ─────────────────────────────────────────────────
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function setWallet(address _wallet) external onlyOwner {
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require(_wallet != address(0), "Invalid wallet address");
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wallet = _wallet;
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emit WalletChanged(_wallet);
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}
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function setTokenPrice(uint256 _tokenPrice) external onlyOwner {
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require(_tokenPrice > 0, "Invalid token price");
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tokenPrice = _tokenPrice;
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emit TokenPriceChanged(_tokenPrice);
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}
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function setHardCap(uint256 _hardCap) external onlyOwner {
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require(_hardCap >= totalTokensSold, "Hard cap below sold amount");
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hardCap = _hardCap;
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emit HardCapChanged(_hardCap);
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}
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function setPriceOracle(address _oracle) external onlyOwner {
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priceOracle = _oracle;
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}
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function transferOwnership(address newOwner) external onlyOwner {
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require(newOwner != address(0), "Invalid owner address");
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owner = newOwner;
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}
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/**
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* @notice 紧急提取合约内的任意代币（误转入的情况）
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* @dev 不可在预售进行中提取 XIC，防止影响购买
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*/
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function emergencyWithdraw(address token, uint256 amount) external onlyOwner {
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// 预售进行中，禁止提取 XIC（防止合约无法发放）
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if (
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token == address(xicToken)
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&& presaleStarted
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&& block.timestamp <= presaleEndTime
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&& totalTokensSold < hardCap
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) {
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revert("Presale: cannot withdraw XIC during active presale");
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}
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IERC20 tokenContract = IERC20(token);
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require(tokenContract.balanceOf(address(this)) >= amount, "Insufficient balance");
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require(tokenContract.transfer(owner, amount), "Transfer failed");
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emit EmergencyWithdraw(token, amount);
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}
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/**
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* @notice 提取合约内误转入的 BNB
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*/
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function withdrawBNB() external onlyOwner {
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uint256 balance = address(this).balance;
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require(balance > 0, "No BNB to withdraw");
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(bool ok, ) = owner.call{value: balance}("");
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require(ok, "BNB withdrawal failed");
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}
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// ─── Receive ───────────────────────────────────────────────────────────────
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receive() external payable {
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if (presaleStarted && !presalePaused && priceOracle != address(0)) {
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// 直接发送 BNB 触发购买
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require(msg.value > 0, "No BNB sent");
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uint256 bnbPriceUSD = IPriceOracle(priceOracle).getBNBPrice();
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require(bnbPriceUSD > 0, "Invalid BNB price");
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uint256 usdValue18 = (msg.value * bnbPriceUSD) / 1e18;
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uint256 tokenAmount = (usdValue18 * 1e18) / tokenPrice;
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require(tokenAmount > 0, "Token amount too small");
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require(totalTokensSold + tokenAmount <= hardCap, "Hard cap reached");
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require(xicToken.balanceOf(address(this)) >= tokenAmount, "Insufficient XIC");
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(bool bnbOk, ) = wallet.call{value: msg.value}("");
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require(bnbOk, "BNB transfer failed");
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require(xicToken.transfer(msg.sender, tokenAmount), "XIC transfer failed");
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uint256 usdtEquiv = usdValue18 / 1e12;
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totalTokensSold += tokenAmount;
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totalRaised += usdtEquiv;
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userPurchases[msg.sender] += tokenAmount;
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userSpent[msg.sender] += usdtEquiv;
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emit TokensPurchased(msg.sender, usdtEquiv, tokenAmount, "BNB");
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}
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}
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}
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