143 lines
5.1 KiB
Solidity
143 lines
5.1 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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/**
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* @title TestUSDT (Flattened)
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* @dev 测试网专用 USDT，可直接在 Remix 部署，无需额外依赖
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*
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* 部署网络:
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* - BSC Testnet: Chain ID 97, RPC: https://data-seed-prebsc-1-s1.binance.org:8545
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* - KAVA Testnet: Chain ID 2221, RPC: https://evm.testnet.kava.io
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*/
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abstract contract Context {
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function _msgSender() internal view virtual returns (address) {
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return msg.sender;
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}
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}
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interface IERC20 {
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event Transfer(address indexed from, address indexed to, uint256 value);
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event Approval(address indexed owner, address indexed spender, uint256 value);
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function totalSupply() external view returns (uint256);
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function balanceOf(address account) external view returns (uint256);
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function transfer(address to, uint256 value) external returns (bool);
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function allowance(address owner, address spender) external view returns (uint256);
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function approve(address spender, uint256 value) external returns (bool);
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function transferFrom(address from, address to, uint256 value) external returns (bool);
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}
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interface IERC20Metadata is IERC20 {
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function name() external view returns (string memory);
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function symbol() external view returns (string memory);
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function decimals() external view returns (uint8);
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}
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abstract contract ERC20 is Context, IERC20, IERC20Metadata {
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mapping(address => uint256) private _balances;
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mapping(address => mapping(address => uint256)) private _allowances;
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uint256 private _totalSupply;
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string private _name;
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string private _symbol;
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constructor(string memory name_, string memory symbol_) {
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_name = name_;
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_symbol = symbol_;
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}
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function name() public view virtual returns (string memory) { return _name; }
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function symbol() public view virtual returns (string memory) { return _symbol; }
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function decimals() public view virtual returns (uint8) { return 18; }
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function totalSupply() public view virtual returns (uint256) { return _totalSupply; }
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function balanceOf(address account) public view virtual returns (uint256) { return _balances[account]; }
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function transfer(address to, uint256 value) public virtual returns (bool) {
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_transfer(_msgSender(), to, value);
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return true;
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}
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function allowance(address owner, address spender) public view virtual returns (uint256) {
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return _allowances[owner][spender];
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}
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function approve(address spender, uint256 value) public virtual returns (bool) {
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_approve(_msgSender(), spender, value);
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return true;
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}
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function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
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address spender = _msgSender();
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uint256 currentAllowance = allowance(from, spender);
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if (currentAllowance != type(uint256).max) {
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require(currentAllowance >= value, "ERC20: insufficient allowance");
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unchecked { _approve(from, spender, currentAllowance - value); }
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}
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_transfer(from, to, value);
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return true;
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}
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function _transfer(address from, address to, uint256 value) internal {
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require(from != address(0), "ERC20: transfer from zero address");
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require(to != address(0), "ERC20: transfer to zero address");
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uint256 fromBalance = _balances[from];
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require(fromBalance >= value, "ERC20: insufficient balance");
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unchecked {
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_balances[from] = fromBalance - value;
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_balances[to] += value;
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}
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emit Transfer(from, to, value);
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}
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function _mint(address account, uint256 value) internal {
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require(account != address(0), "ERC20: mint to zero address");
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_totalSupply += value;
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unchecked { _balances[account] += value; }
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emit Transfer(address(0), account, value);
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}
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function _approve(address owner, address spender, uint256 value) internal {
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require(owner != address(0) && spender != address(0), "ERC20: zero address");
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_allowances[owner][spender] = value;
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emit Approval(owner, spender, value);
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}
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}
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contract TestUSDT is ERC20 {
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uint8 private constant _decimals = 6;
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address public owner;
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modifier onlyOwner() {
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require(msg.sender == owner, "Not owner");
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_;
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}
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constructor() ERC20("Test USDT", "USDT") {
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owner = msg.sender;
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_mint(msg.sender, 1_000_000 * 10 ** _decimals);
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}
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function decimals() public pure override returns (uint8) {
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return _decimals;
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}
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/// @dev 任何人可以 mint (测试网专用)
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function mint(uint256 amount) external {
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_mint(msg.sender, amount);
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}
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/// @dev 便捷函数: 输入 USDT 数量，自动处理精度
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function mintUsdt(uint256 usdtAmount) external {
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_mint(msg.sender, usdtAmount * 10 ** _decimals);
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}
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/// @dev Owner 给任意地址 mint
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function mintTo(address to, uint256 amount) external onlyOwner {
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_mint(to, amount);
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}
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/// @dev 水龙头: 一次领 10000 USDT
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function faucet() external {
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_mint(msg.sender, 10_000 * 10 ** _decimals);
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}
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}
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