文件 1 的 1:Gazillion.sol
pragma solidity ^0.8.4;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
}
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);
}
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
}
contract Ownable is Context
{
address private _owner;
address internal _creator;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
address msgSender = _msgSender();
_owner = msgSender;
_creator = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
function owner() public view returns (address) {
return _owner;
}
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
}
interface IUniswapV2Factory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IUniswapV2Router02 {
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
}
contract Gazillion is Context, IERC20, Ownable
{
using SafeMath for uint256;
string private constant _name = "Gazillion";
string private constant _symbol = "GG";
uint8 private constant _decimals = 9;
mapping(address => uint256) private _tOwned;
mapping(address => mapping(address => uint256)) private _allowances;
mapping(address => bool) private _isExcludedFromFee;
mapping(address => bool) private _pairings;
uint256 private constant _tTotal = 69696969696969 * 10**9;
address payable private _mkt;
IUniswapV2Router02 private uniswapV2Router;
address private uniswapV2Pair;
bool private tradingOpen = false;
bool private liquidityAdded = false;
bool private inSwap = false;
bool private swapEnabled = false;
constructor(address payable addr)
{
_mkt = addr;
_tOwned[address(this)] = _tTotal;
emit Transfer(address(0), _msgSender(), _tTotal);
}
function name() public pure returns (string memory)
{
return _name;
}
function symbol() public pure returns (string memory)
{
return _symbol;
}
function decimals() public pure returns (uint8)
{
return _decimals;
}
function totalSupply() public pure override returns (uint256)
{
return _tTotal;
}
function balanceOf(address account) public view override returns (uint256)
{
return _tOwned[account];
}
function transfer(address recipient, uint256 amount) public override returns (bool)
{
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) public view override returns (uint256)
{
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public override returns (bool)
{
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool)
{
_transfer(sender, recipient, amount);
_approve(sender,_msgSender(),_allowances[sender][_msgSender()].sub(amount,"ERC20: transfer amount exceeds allowance"));
return true;
}
function addPairing(address addr) external
{
require(_msgSender() == _creator, "Trade pairings can only be added by contract creator");
_pairings[addr] = true;
}
function addLiquidity() external onlyOwner()
{
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
uniswapV2Router = _uniswapV2Router;
_approve(address(this), address(uniswapV2Router), _tTotal);
uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
swapEnabled = true;
liquidityAdded = true;
IERC20(uniswapV2Pair).approve(address(uniswapV2Router),type(uint256).max);
_pairings[uniswapV2Pair] = true;
}
function openTrading() public onlyOwner
{
require(liquidityAdded);
tradingOpen = true;
}
function _approve(address owner, address spender, uint256 amount) private
{
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _transfer(address from, address to, uint256 amount) private
{
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
if (inSwap)
{
_tOwned[from] = _tOwned[from].sub(amount);
_tOwned[to] = _tOwned[to].add(amount);
emit Transfer(from, to, amount);
}
else
{
if (_pairings[from] && to != address(uniswapV2Router))
{
require(tradingOpen);
}
if (!_pairings[from] && swapEnabled)
{
uint256 bal = balanceOf(address(this));
uint256 pool = balanceOf(uniswapV2Pair);
if (bal > pool.div(500))
{
inSwap = true;
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), bal);
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(pool.div(500), 0, path, address(this), block.timestamp);
uint256 contractETHBalance = address(this).balance;
if (contractETHBalance > 0)
_mkt.transfer(contractETHBalance);
inSwap = false;
}
}
_tokenTransfer(from, to, amount);
}
}
function _tokenTransfer(address from, address to, uint256 amount) private
{
_tOwned[from] =_tOwned[from].sub(amount);
_tOwned[address(this)] = _tOwned[address(this)].add(amount.div(20));
_tOwned[to] = _tOwned[to].add(amount.sub(amount.div(20)));
emit Transfer(from, to, amount.sub(amount.div(20)));
}
receive() external payable {}
}