376 lines
12 KiB
Solidity
376 lines
12 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
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import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
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import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
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import "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";
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import "@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol";
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import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
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/**
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* @title YTAssetVault
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* @notice 基于价格的资产金库，用户根据WUSD和YT代币价格进行兑换
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* @dev UUPS可升级合约，YT是份额代币
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*/
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contract YTAssetVault is
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Initializable,
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ERC20Upgradeable,
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UUPSUpgradeable,
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ReentrancyGuardUpgradeable,
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PausableUpgradeable
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{
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using SafeERC20 for IERC20;
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error Forbidden();
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error HardCapExceeded();
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error InvalidAmount();
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error InvalidHardCap();
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error InvalidPrice();
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error InsufficientWUSD();
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error InsufficientYTA();
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error StillInLockPeriod();
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/// @notice 工厂合约地址
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address public factory;
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/// @notice 管理员地址
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address public manager;
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/// @notice YT代币硬顶（最大可铸造的YT数量）
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uint256 public hardCap;
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/// @notice 已提取用于管理的WUSD数量
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uint256 public managedAssets;
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/// @notice WUSD代币地址
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address public wusdAddress;
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/// @notice WUSD价格（精度1e30）
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uint256 public wusdPrice;
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/// @notice YT价格（精度1e30）
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uint256 public ytPrice;
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/// @notice 价格精度
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uint256 public constant PRICE_PRECISION = 1e30;
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/// @notice 下一个赎回开放时间（所有用户统一）
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uint256 public nextRedemptionTime;
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event HardCapSet(uint256 newHardCap);
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event ManagerSet(address indexed newManager);
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event AssetsWithdrawn(address indexed to, uint256 amount);
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event AssetsDeposited(uint256 amount);
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event PriceUpdated(uint256 wusdPrice, uint256 ytPrice, uint256 timestamp);
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event Buy(address indexed user, uint256 wusdAmount, uint256 ytAmount);
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event Sell(address indexed user, uint256 ytAmount, uint256 wusdAmount);
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event NextRedemptionTimeSet(uint256 newRedemptionTime);
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modifier onlyFactory() {
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if (msg.sender != factory) revert Forbidden();
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_;
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}
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modifier onlyManager() {
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if (msg.sender != manager) revert Forbidden();
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_;
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}
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/**
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* @notice 初始化金库
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* @param _name YT代币名称
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* @param _symbol YT代币符号
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* @param _manager 管理员地址
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* @param _hardCap 硬顶限制
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* @param _wusd WUSD代币地址（可选，传0则使用默认地址）
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* @param _redemptionTime 赎回时间（Unix时间戳）
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* @param _initialWusdPrice 初始WUSD价格（精度1e30，传0则使用默认值1.0）
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* @param _initialYtPrice 初始YT价格（精度1e30，传0则使用默认值1.0）
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*
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* @dev 价格精度为1e30
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*/
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function initialize(
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string memory _name,
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string memory _symbol,
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address _manager,
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uint256 _hardCap,
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address _wusd,
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uint256 _redemptionTime,
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uint256 _initialWusdPrice,
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uint256 _initialYtPrice
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) external initializer {
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wusdAddress = _wusd == address(0)
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? 0x7Cd017ca5ddb86861FA983a34b5F495C6F898c41
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: _wusd;
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__ERC20_init(_name, _symbol);
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__UUPSUpgradeable_init();
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__ReentrancyGuard_init();
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__Pausable_init();
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factory = msg.sender;
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manager = _manager;
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hardCap = _hardCap;
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// 使用传入的初始价格，如果为0则使用默认值1.0
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wusdPrice = _initialWusdPrice == 0 ? PRICE_PRECISION : _initialWusdPrice;
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ytPrice = _initialYtPrice == 0 ? PRICE_PRECISION : _initialYtPrice;
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// 设置赎回时间
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nextRedemptionTime = _redemptionTime;
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}
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/**
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* @notice 授权升级（仅factory可调用）
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* @param newImplementation 新实现合约地址
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*/
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function _authorizeUpgrade(address newImplementation) internal override onlyFactory {}
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/**
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* @notice 设置硬顶
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* @param _hardCap 新的硬顶值
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*/
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function setHardCap(uint256 _hardCap) external onlyFactory {
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if (_hardCap < totalSupply()) revert InvalidHardCap();
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hardCap = _hardCap;
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emit HardCapSet(_hardCap);
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}
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/**
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* @notice 设置管理员
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* @param _manager 新管理员地址
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*/
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function setManager(address _manager) external onlyFactory {
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manager = _manager;
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emit ManagerSet(_manager);
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}
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/**
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* @notice 暂停合约（仅factory可调用）
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* @dev 暂停后，所有资金流动操作将被禁止
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*/
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function pause() external onlyFactory {
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_pause();
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}
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/**
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* @notice 恢复合约（仅factory可调用）
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*/
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function unpause() external onlyFactory {
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_unpause();
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}
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/**
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* @notice 设置下一个赎回开放时间（仅factory可调用）
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* @param _nextRedemptionTime 下一个赎回时间（Unix时间戳）
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* @dev 所有用户统一在此时间后才能赎回，类似基金的赎回日
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*/
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function setNextRedemptionTime(uint256 _nextRedemptionTime) external onlyFactory {
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nextRedemptionTime = _nextRedemptionTime;
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emit NextRedemptionTimeSet(_nextRedemptionTime);
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}
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/**
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* @notice 更新价格（仅manager可调用）
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* @param _wusdPrice WUSD价格（精度1e30）
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* @param _ytPrice YT价格（精度1e30）
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*/
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function updatePrices(uint256 _wusdPrice, uint256 _ytPrice) external onlyFactory {
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if (_wusdPrice == 0 || _ytPrice == 0) revert InvalidPrice();
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wusdPrice = _wusdPrice;
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ytPrice = _ytPrice;
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emit PriceUpdated(_wusdPrice, _ytPrice, block.timestamp);
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}
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/**
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* @notice 用WUSD购买YT
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* @param _wusdAmount 支付的WUSD数量
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* @return ytAmount 实际获得的YT数量
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* @dev 首次购买时，YT价格 = WUSD价格（1:1兑换）
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*/
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function depositYT(uint256 _wusdAmount)
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external
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nonReentrant
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whenNotPaused
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returns (uint256 ytAmount)
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{
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if (_wusdAmount == 0) revert InvalidAmount();
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// 计算可以购买的YT数量
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ytAmount = (_wusdAmount * wusdPrice) / ytPrice;
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// 检查硬顶
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if (hardCap > 0 && totalSupply() + ytAmount > hardCap) {
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revert HardCapExceeded();
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}
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// 转入WUSD
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IERC20(wusdAddress).safeTransferFrom(msg.sender, address(this), _wusdAmount);
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// 铸造YT
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_mint(msg.sender, ytAmount);
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emit Buy(msg.sender, _wusdAmount, ytAmount);
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}
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/**
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* @notice 卖出YT换取WUSD（需要等到统一赎回时间）
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* @param _ytAmount 卖出的YT数量
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* @return wusdAmount 实际获得的WUSD数量
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*/
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function withdrawYT(uint256 _ytAmount)
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external
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nonReentrant
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whenNotPaused
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returns (uint256 wusdAmount)
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{
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if (_ytAmount == 0) revert InvalidAmount();
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if (balanceOf(msg.sender) < _ytAmount) revert InsufficientYTA();
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// 检查是否到达统一赎回时间
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if (block.timestamp < nextRedemptionTime) {
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revert StillInLockPeriod();
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}
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// 计算可以换取的WUSD数量
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wusdAmount = (_ytAmount * ytPrice) / wusdPrice;
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// 检查合约是否有足够的WUSD
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uint256 availableWUSD = IERC20(wusdAddress).balanceOf(address(this));
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if (wusdAmount > availableWUSD) revert InsufficientWUSD();
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// 销毁YT
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_burn(msg.sender, _ytAmount);
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// 转出WUSD
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IERC20(wusdAddress).safeTransfer(msg.sender, wusdAmount);
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emit Sell(msg.sender, _ytAmount, wusdAmount);
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}
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/**
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* @notice 查询距离下次赎回开放还需等待多久
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* @return remainingTime 剩余时间（秒），0表示可以赎回
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*/
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function getTimeUntilNextRedemption() external view returns (uint256 remainingTime) {
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if (block.timestamp >= nextRedemptionTime) {
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return 0;
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}
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return nextRedemptionTime - block.timestamp;
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}
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/**
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* @notice 检查当前是否可以赎回
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* @return 是否可以赎回
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*/
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function canRedeemNow() external view returns (bool) {
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return block.timestamp >= nextRedemptionTime;
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}
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/**
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* @notice 提取WUSD用于外部投资
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* @param _to 接收地址
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* @param _amount 提取数量
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*/
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function withdrawForManagement(address _to, uint256 _amount) external onlyManager nonReentrant whenNotPaused {
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if (_amount == 0) revert InvalidAmount();
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uint256 availableAssets = IERC20(wusdAddress).balanceOf(address(this));
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if (_amount > availableAssets) revert InvalidAmount();
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managedAssets += _amount;
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IERC20(wusdAddress).safeTransfer(_to, _amount);
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emit AssetsWithdrawn(_to, _amount);
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}
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/**
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* @notice 将管理的资产归还到金库（可以归还更多，产生收益）
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* @param _amount 归还数量
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*/
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function depositManagedAssets(uint256 _amount) external onlyManager nonReentrant whenNotPaused {
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if (_amount == 0) revert InvalidAmount();
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// 先更新状态（遵循CEI模式）
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if (_amount >= managedAssets) {
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// 归还金额 >= 已管理资产，managedAssets归零，多余部分是收益
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managedAssets = 0;
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} else {
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// 归还金额 < 已管理资产，部分归还
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managedAssets -= _amount;
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}
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// 从manager转入WUSD到合约
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IERC20(wusdAddress).safeTransferFrom(msg.sender, address(this), _amount);
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emit AssetsDeposited(_amount);
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}
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/**
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* @notice 获取总资产（包含被管理的资产）
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* @return 总资产 = 合约余额 + 被管理的资产
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*/
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function totalAssets() public view returns (uint256) {
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return IERC20(wusdAddress).balanceOf(address(this)) + managedAssets;
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}
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/**
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* @notice 获取空闲资产（可用于提取的资产）
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* @return 合约中实际持有的WUSD数量
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*/
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function idleAssets() public view returns (uint256) {
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return IERC20(wusdAddress).balanceOf(address(this));
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}
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/**
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* @notice 预览购买：计算支付指定WUSD可获得的YT数量
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* @param _wusdAmount 支付的WUSD数量
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* @return ytAmount 可获得的YT数量
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*/
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function previewBuy(uint256 _wusdAmount) external view returns (uint256 ytAmount) {
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ytAmount = (_wusdAmount * wusdPrice) / ytPrice;
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}
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/**
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* @notice 预览卖出：计算卖出指定YT可获得的WUSD数量
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* @param _ytAmount 卖出的YT数量
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* @return wusdAmount 可获得的WUSD数量
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*/
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function previewSell(uint256 _ytAmount) external view returns (uint256 wusdAmount) {
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wusdAmount = (_ytAmount * ytPrice) / wusdPrice;
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}
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/**
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* @notice 获取金库信息
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*/
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function getVaultInfo() external view returns (
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uint256 _totalAssets,
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uint256 _idleAssets,
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uint256 _managedAssets,
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uint256 _totalSupply,
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uint256 _hardCap,
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uint256 _wusdPrice,
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uint256 _ytPrice,
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uint256 _nextRedemptionTime
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) {
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_totalAssets = totalAssets();
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_idleAssets = idleAssets();
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_managedAssets = managedAssets;
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_totalSupply = totalSupply();
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_hardCap = hardCap;
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_wusdPrice = wusdPrice;
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_ytPrice = ytPrice;
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_nextRedemptionTime = nextRedemptionTime;
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}
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/**
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* @dev 预留存储空间，用于未来升级时添加新的状态变量
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* 50个slot = 50 * 32 bytes = 1600 bytes
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*/
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uint256[50] private __gap;
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}
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