文件 1 的 4:Context.sol
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
文件 2 的 4:IVUSD.sol
pragma solidity 0.8.9;
interface IVUSD {
function burn(address _account, uint256 _amount) external;
function mint(address _account, uint256 _amount) external;
function balanceOf(address _account) external view returns (uint256);
}
文件 3 的 4:Ownable.sol
pragma solidity ^0.8.0;
import "../utils/Context.sol";
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_transferOwnership(_msgSender());
}
function owner() public view virtual returns (address) {
return _owner;
}
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
文件 4 的 4:VUSD.sol
pragma solidity 0.8.9;
import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/IVUSD.sol";
contract VUSD is IVUSD, Ownable {
uint8 public constant decimals = 30;
string public name;
string public symbol;
uint256 public totalSupply;
mapping(address => uint256) public balances;
event Burn(address indexed account, uint256 value);
event Mint(address indexed beneficiary, uint256 value);
constructor(string memory _name, string memory _symbol, uint256 _initialSupply) {
name = _name;
symbol = _symbol;
_mint(msg.sender, _initialSupply);
}
function burn(address _account, uint256 _amount) external override onlyOwner {
_burn(_account, _amount);
}
function mint(address _account, uint256 _amount) external override onlyOwner {
_mint(_account, _amount);
}
function setInfo(string memory _name, string memory _symbol) external onlyOwner {
name = _name;
symbol = _symbol;
}
function balanceOf(address _account) external view override returns (uint256) {
return balances[_account];
}
function _burn(address _account, uint256 _amount) internal {
require(_account != address(0), "VUSD: burn from the zero address");
require(balances[_account] >= _amount, "VUSD: burn amount exceeds balance");
balances[_account] -= _amount;
totalSupply -= _amount;
emit Burn(_account, _amount);
}
function _mint(address _account, uint256 _amount) internal {
require(_account != address(0), "VUSD: mint to the zero address");
totalSupply += _amount;
balances[_account] += _amount;
emit Mint(_account, _amount);
}
}
{
"compilationTarget": {
"contracts/tokens/VUSD.sol": "VUSD"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint256","name":"_initialSupply","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"}],"name":"setInfo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]