Contract Name:
ERC20BABYUSH1
Contract Source Code:
// SPDX-License-Identifier: MIT
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// Is an improved fork token with
// the function of a passive staking protocol
// on the Ethereum network Mainnet,
// which is launched for the purpose
// of Continue the BULLISH trend
// https://babyushi.com/
// https://twitter.com/babyushieth
// https://t.me/babyushiengchat
// https://t.me/babyushieng
// Rewards 8%
// BuyBack 3%
// AutoLp 1%
// Marketing 8%
pragma solidity ^0.8.14;
import './interfaces/RewardsTracker.sol';
import './interfaces/Ownable.sol';
import './interfaces/IDex.sol';
import './interfaces/IERC20.sol';
import './interfaces/ERC20.sol';
library Address {
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 ERC20BABYUSH1 is ERC20, Ownable, RewardsTracker {
using Address for address payable;
IRouter public router;
address public pair;
bool private swapping;
bool public antiBotSystem;
bool public swapEnabled = true;
address public marketingWallet = 0xdE747aeF6E223601352aD01A9115D34b7a333c04;
address public buybackWallet = 0x5e901ca79A5CDe2804772910Fa3eC7eAC651F147;
uint256 public swapTokensAtAmount = 10_000_000 * 10**18;
uint256 public maxWalletAmount = 105_000_000 * 10**18;
uint256 public gasLimit = 300_000;
uint256 public goldenHourStart;
struct Taxes {
uint64 rewards;
uint64 marketing;
uint64 buyback;
uint64 lp;
}
Taxes public buyTaxes = Taxes(8, 8, 3, 1);
Taxes public sellTaxes = Taxes(8, 8, 3, 1);
uint256 public totalBuyTax = 20;
uint256 public totalSellTax = 20;
mapping(address => bool) public _isExcludedFromFees;
mapping(address => bool) public antiBot;
mapping(address => bool) public isPair;
///////////////
// Events //
///////////////
event ExcludeFromFees(address indexed account, bool isExcluded);
event ExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded);
event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
event GasForProcessingUpdated(uint256 indexed newValue, uint256 indexed oldValue);
event SendDividends(uint256 tokensSwapped, uint256 amount);
event ProcessedDividendTracker(
uint256 iterations,
uint256 claims,
uint256 lastProcessedIndex,
bool indexed automatic,
uint256 gas,
address indexed processor
);
constructor(address _router, address _rewardToken) ERC20('BUSHI', 'BUSHI') RewardsTracker(_router, _rewardToken) {
router = IRouter(_router);
pair = IFactory(router.factory()).createPair(address(this), router.WETH());
isPair[pair] = true;
minBalanceForRewards = 210_000 * 10**18;
claimDelay = 1 hours;
// exclude from receiving dividends
excludedFromDividends[address(this)] = true;
excludedFromDividends[owner()] = true;
excludedFromDividends[address(0xdead)] = true;
excludedFromDividends[address(_router)] = true;
excludedFromDividends[address(pair)] = true;
// exclude from paying fees or having max transaction amount
_isExcludedFromFees[owner()] = true;
_isExcludedFromFees[address(this)] = true;
_isExcludedFromFees[marketingWallet] = true;
_isExcludedFromFees[buybackWallet] = true;
antiBotSystem = true;
antiBot[address(this)] = true;
antiBot[owner()] = true;
antiBot[marketingWallet] = true;
antiBot[buybackWallet] = true;
// _mint is an internal function in ERC20.sol that is only called here,
// and CANNOT be called ever again
_mint(owner(), 21e9 * (10**18));
}
receive() external payable {}
/// @notice Manual claim the dividends
function claim() external {
super._processAccount(payable(msg.sender));
}
function rescueERC20(address tokenAddress, uint256 amount) external onlyOwner {
IERC20(tokenAddress).transfer(owner(), amount);
}
function rescueETH() external onlyOwner {
uint256 ETHbalance = address(this).balance;
payable(owner()).sendValue(ETHbalance);
}
function updateRouter(address newRouter) external onlyOwner {
router = IRouter(newRouter);
}
/////////////////////////////////
// Exclude / Include functions //
/////////////////////////////////
function excludeFromFees(address account, bool excluded) public onlyOwner {
_isExcludedFromFees[account] = excluded;
emit ExcludeFromFees(account, excluded);
}
function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner {
for (uint256 i = 0; i < accounts.length; i++) {
_isExcludedFromFees[accounts[i]] = excluded;
}
emit ExcludeMultipleAccountsFromFees(accounts, excluded);
}
///////////////////////
// Setter Functions //
///////////////////////
function setRewardToken(address newToken) external onlyOwner {
super._setRewardToken(newToken);
}
function startGoldenHour() external onlyOwner {
goldenHourStart = block.timestamp;
}
function setMarketingWallet(address newWallet) external onlyOwner {
marketingWallet = newWallet;
}
function setBuybackWallet(address newWallet) external onlyOwner {
buybackWallet = newWallet;
}
function setClaimDelay(uint256 amountInSeconds) external onlyOwner {
claimDelay = amountInSeconds;
}
function setSwapTokensAtAmount(uint256 amount) external onlyOwner {
swapTokensAtAmount = amount * 10**18;
}
function setBuyTaxes(
uint64 _rewards,
uint64 _marketing,
uint64 _buyback,
uint64 _lp
) external onlyOwner {
buyTaxes = Taxes(_rewards, _marketing, _buyback, _lp);
totalBuyTax = _rewards + _marketing + _buyback + _lp;
}
function setSellTaxes(
uint64 _rewards,
uint64 _marketing,
uint64 _buyback,
uint64 _lp
) external onlyOwner {
sellTaxes = Taxes(_rewards, _marketing, _buyback, _lp);
totalSellTax = _rewards + _marketing + _buyback + _lp;
}
function setMaxWallet(uint256 maxWalletPercentage) external onlyOwner {
maxWalletAmount = (maxWalletPercentage * totalSupply()) / 1000;
}
function setGasLimit(uint256 newGasLimit) external onlyOwner {
gasLimit = newGasLimit;
//QWxsIHJpZ2h0cyBiZWxvbmcgdG8gQkFZVVNISS4gQ29weWluZyBhIGNvbnRyYWN0IGlzIGEgdmlvbGF0aW9uIGFuZCBzdWdnZXN0cyB0aGF0IHdob2V2ZXIgZGlkIGl0IGhhcyBzbW9vdGhpZXMgaW5zdGVhZCBvZiBicmFpbnMu
}
function setSwapEnabled(bool _enabled) external onlyOwner {
swapEnabled = _enabled;
}
function setMinBalanceForRewards(uint256 minBalance) external onlyOwner {
minBalanceForRewards = minBalance * 10**18;
}
function setAntiBotStatus(bool value) external onlyOwner {
_setAntiBotStatus(value);
}
function _setAntiBotStatus(bool value) internal {
antiBotSystem = value;
}
function addAntiBot(address _address) external onlyOwner {
_addAntiBot(_address);
}
function addMultipleAntiBot(address[] memory _addresses) external onlyOwner {
for (uint256 i = 0; i < _addresses.length; i++) {
_addAntiBot(_addresses[i]);
}
}
function _addAntiBot(address _address) internal {
antiBot[_address] = true;
}
function removeMultipleAntiBot(address[] memory _addresses) external onlyOwner {
for (uint256 i = 0; i < _addresses.length; i++) {
_removeAntiBot(_addresses[i]);
}
}
function _removeAntiBot(address _address) internal {
antiBot[_address] = false;
}
/// @dev Set new pairs created due to listing in new DEX
function setPair(address newPair, bool value) external onlyOwner {
_setPair(newPair, value);
}
function _setPair(address newPair, bool value) private {
isPair[newPair] = value;
if (value) {
excludedFromDividends[newPair] = true;
}
}
////////////////////////
// Transfer Functions //
////////////////////////
function _transfer(
address from,
address to,
uint256 amount
) internal override {
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 (antiBotSystem) {
require(antiBot[tx.origin], 'Address is bot');
}
if (!_isExcludedFromFees[from] && !_isExcludedFromFees[to] && !swapping) {
if (!isPair[to]) {
require(balanceOf(to) + amount <= maxWalletAmount, 'You are exceeding maxWallet');
}
}
uint256 contractTokenBalance = balanceOf(address(this));
bool canSwap = contractTokenBalance >= swapTokensAtAmount;
if (
canSwap &&
!swapping &&
swapEnabled &&
!isPair[from] &&
!_isExcludedFromFees[from] &&
!_isExcludedFromFees[to] &&
totalSellTax > 0
) {
swapping = true;
swapAndLiquify(swapTokensAtAmount);
swapping = false;
}
bool takeFee = !swapping;
if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
takeFee = false;
}
if (!isPair[to] && !isPair[from]) takeFee = false;
if (takeFee) {
uint256 feeAmt;
if (isPair[to]) feeAmt = (amount * totalSellTax) / 100;
else if (isPair[from]) {
if (block.timestamp < goldenHourStart + 1 hours)
feeAmt = (amount * (buyTaxes.lp + buyTaxes.buyback)) / 100;
else feeAmt = (amount * totalBuyTax) / 100;
}
amount = amount - feeAmt;
super._transfer(from, address(this), feeAmt);
}
super._transfer(from, to, amount);
super.setBalance(from, balanceOf(from));
super.setBalance(to, balanceOf(to));
if (!swapping) {
super.autoDistribute(gasLimit);
}
}
function swapAndLiquify(uint256 tokens) private {
// Split the contract balance into halves
uint256 denominator = totalSellTax * 2;
uint256 tokensToAddLiquidityWith = (tokens * sellTaxes.lp) / denominator;
uint256 toSwap = tokens - tokensToAddLiquidityWith;
uint256 initialBalance = address(this).balance;
swapTokensForETH(toSwap);
uint256 deltaBalance = address(this).balance - initialBalance;
uint256 unitBalance = deltaBalance / (denominator - sellTaxes.lp);
uint256 bnbToAddLiquidityWith = unitBalance * sellTaxes.lp;
if (bnbToAddLiquidityWith > 0) {
// Add liquidity to pancake
addLiquidity(tokensToAddLiquidityWith, bnbToAddLiquidityWith);
}
// Send ETH to marketing
uint256 marketingAmt = unitBalance * 2 * sellTaxes.marketing;
if (marketingAmt > 0) {
payable(marketingWallet).sendValue(marketingAmt);
}
// Send ETH to buyback
uint256 buybackAmt = unitBalance * 2 * sellTaxes.buyback;
if (buybackAmt > 0) {
payable(buybackWallet).sendValue(buybackAmt);
}
// Send ETH to rewards
uint256 dividends = unitBalance * 2 * sellTaxes.rewards;
if (dividends > 0) super._distributeDividends(dividends);
}
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(router), tokenAmount);
// add the liquidity
router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
owner(),
block.timestamp
);
}
function swapTokensForETH(uint256 tokenAmount) private {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();
_approve(address(this), address(router), tokenAmount);
// make the swap
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path, // QWxsIHJpZ2h0cyBiZWxvbmcgdG8gQkFZVVNISS4gQ29weWluZyBhIGNvbnRyYWN0IGlzIGEgdmlvbGF0aW9uIGFuZCBzdWdnZXN0cyB0aGF0IHdob2V2ZXIgZGlkIGl0IGhhcyBzbW9vdGhpZXMgaW5zdGVhZCBvZiBicmFpbnMu
address(this),
block.timestamp
);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "./Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;
import "./Ownable.sol";
import "./IDex.sol";
import "./IERC20.sol";
/// @title RewardsTracker
/// @author FreezyEx (https://github.com/FreezyEx)
/// @dev A contract that allows anyone to pay and distribute ethers to users as shares.
/// @notice This contract is based on erc1726 by Roger-Wu (https://github.com/Roger-Wu/erc1726-dividend-paying-token)
contract RewardsTracker is Ownable {
mapping(address => uint256) public userShares;
mapping(address => int256) internal magnifiedDividendCorrections;
mapping(address => uint256) internal withdrawnDividends;
mapping(address => bool) public excludedFromDividends;
mapping(address => uint256) public lastClaimTime;
mapping(address => uint256) public elegibleUsersIndex;
mapping(address => bool ) public isElegible;
address[] elegibleUsers;
IRouter public rewardRouter;
address public rewardToken;
uint256 constant internal magnitude = 2**128;
uint256 internal magnifiedDividendPerShare;
uint256 public totalDividends;
uint256 public totalDividendsWithdrawn;
uint256 public totalShares;
uint256 public minBalanceForRewards;
uint256 public claimDelay;
uint256 public currentIndex;
event ExcludeFromDividends(address indexed account, bool value);
event Claim(address indexed account, uint256 amount);
event DividendWithdrawn(address indexed to, uint256 weiAmount);
constructor(address _router, address _rewardToken) {
rewardRouter = IRouter(_router);
rewardToken = _rewardToken;
}
function excludeFromDividends(address account, bool value) external onlyOwner {
require(excludedFromDividends[account] != value);
excludedFromDividends[account] = value;
if(value == true){
_setBalance(account, 0);
}
else{
_setBalance(account, userShares[account]);
}
emit ExcludeFromDividends(account, value);
}
function _setRewardToken(address newToken) internal{
rewardToken = newToken;
}
function getAccount(address account) public view returns (uint256 withdrawableUserDividends, uint256 totalUserDividends, uint256 lastUserClaimTime, uint256 withdrawnUserDividends) {
withdrawableUserDividends = withdrawableDividendOf(account);
totalUserDividends = accumulativeDividendOf(account);
lastUserClaimTime = lastClaimTime[account];
withdrawnUserDividends = withdrawnDividends[account];
}
function setBalance(address account, uint256 newBalance) internal {
if(excludedFromDividends[account]) {
return;
}
_setBalance(account, newBalance);
}
function _setMinBalanceForRewards(uint256 newMinBalance) internal {
minBalanceForRewards = newMinBalance;
}
function autoDistribute(uint256 gasAvailable) public {
uint256 size = elegibleUsers.length;
if(size == 0) return;
uint256 gasSpent = 0;
uint256 gasLeft = gasleft();
uint256 lastIndex = currentIndex;
uint256 iterations = 0;
while(gasSpent < gasAvailable && iterations < size){
if(lastIndex >= size){
lastIndex = 0;
}
address account = elegibleUsers[lastIndex];
if(lastClaimTime[account] + claimDelay < block.timestamp){
_processAccount(account);
}
lastIndex++;
iterations++;
gasSpent += gasLeft - gasleft();
gasLeft = gasleft();
}
currentIndex = lastIndex;
}
function _processAccount(address account) internal returns(bool){
uint256 amount = _withdrawDividendOfUser(account);
if(amount > 0) {
lastClaimTime[account] = block.timestamp;
emit Claim(account, amount);
return true;
}
return false;
}
function distributeDividends() external payable {
if (msg.value > 0) {
_distributeDividends(msg.value);
}
}
function _distributeDividends(uint256 amount) internal {
require(totalShares > 0);
magnifiedDividendPerShare = magnifiedDividendPerShare + (amount * magnitude / totalShares);
totalDividends= totalDividends + amount;
}
function _withdrawDividendOfUser(address user) internal returns (uint256) {
uint256 _withdrawableDividend = withdrawableDividendOf(user);
if (_withdrawableDividend > 0) {
withdrawnDividends[user] += _withdrawableDividend;
totalDividendsWithdrawn += _withdrawableDividend;
emit DividendWithdrawn(user, _withdrawableDividend);
(bool success) = swapEthForCustomToken(user, _withdrawableDividend);
if(!success) {
(bool secondSuccess,) = payable(user).call{value: _withdrawableDividend, gas: 3000}("");
if(!secondSuccess) {
withdrawnDividends[user] -= _withdrawableDividend;
totalDividendsWithdrawn -= _withdrawableDividend;
return 0;
}
}
return _withdrawableDividend;
}
return 0;
}
function swapEthForCustomToken(address user, uint256 amt) internal returns (bool) {
address[] memory path = new address[](2);
path[0] = rewardRouter.WETH();
path[1] = rewardToken;
try rewardRouter.swapExactETHForTokensSupportingFeeOnTransferTokens{value: amt}(0, path, user, block.timestamp) {
return true;
} catch {
return false;
}
}
function dividendOf(address _owner) public view returns(uint256) {
return withdrawableDividendOf(_owner);
}
function withdrawableDividendOf(address _owner) public view returns(uint256) {
return accumulativeDividendOf(_owner) - withdrawnDividends[_owner];
}
function withdrawnDividendOf(address _owner) public view returns(uint256) {
return withdrawnDividends[_owner];
}
function accumulativeDividendOf(address _owner) public view returns(uint256) {
return uint256(int256(magnifiedDividendPerShare * userShares[_owner]) + magnifiedDividendCorrections[_owner]) / magnitude;
}
function addShares(address account, uint256 value) internal {
userShares[account] += value;
totalShares += value;
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account] - int256(magnifiedDividendPerShare * value);
}
function removeShares(address account, uint256 value) internal {
userShares[account] -= value;
totalShares -= value;
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account] + int256(magnifiedDividendPerShare * value);
}
function _setBalance(address account, uint256 newBalance) internal {
uint256 currentBalance = userShares[account];
if(currentBalance > 0) {
_processAccount(account);
}
if(newBalance < minBalanceForRewards && isElegible[account]){
isElegible[account] = false;
elegibleUsers[elegibleUsersIndex[account]] = elegibleUsers[elegibleUsers.length - 1];
elegibleUsersIndex[elegibleUsers[elegibleUsers.length - 1]] = elegibleUsersIndex[account];
elegibleUsers.pop();
removeShares(account, currentBalance);
}
else{
if(userShares[account] == 0){
isElegible[account] = true;
elegibleUsersIndex[account] = elegibleUsers.length;
elegibleUsers.push(account);
}
if(newBalance > currentBalance) {
uint256 mintAmount = newBalance - currentBalance;
addShares(account, mintAmount);
} else if(newBalance < currentBalance) {
uint256 burnAmount = currentBalance - newBalance;
removeShares(account, burnAmount);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
interface IFactory{
function createPair(address tokenA, address tokenB) external returns (address pair);
function getPair(address tokenA, address tokenB) external view returns (address pair);
}
interface IRouter {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./Context.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC20
* applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(
address from,
address to,
uint256 amount
) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
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);
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}