// SPDX-License-Identifier: MITpragmasolidity >=0.6.0 <0.8.0;/**
* @dev Collection of functions related to the address type
*/libraryAddress{
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/functionisContract(address account) internalviewreturns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in// construction, since the code is only stored at the end of the// constructor execution.uint256 size;
// solhint-disable-next-line no-inline-assemblyassembly { size :=extcodesize(account) }
return size >0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/functionsendValue(addresspayable recipient, uint256 amount) internal{
require(address(this).balance>= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/functionfunctionCall(address target, bytesmemory data) internalreturns (bytesmemory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/functionfunctionCall(address target, bytesmemory data, stringmemory errorMessage) internalreturns (bytesmemory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/functionfunctionCallWithValue(address target, bytesmemory data, uint256 value) internalreturns (bytesmemory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/functionfunctionCallWithValue(address target, bytesmemory data, uint256 value, stringmemory errorMessage) internalreturns (bytesmemory) {
require(address(this).balance>= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytesmemory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/functionfunctionStaticCall(address target, bytesmemory data) internalviewreturns (bytesmemory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/functionfunctionStaticCall(address target, bytesmemory data, stringmemory errorMessage) internalviewreturns (bytesmemory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytesmemory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/functionfunctionDelegateCall(address target, bytesmemory data) internalreturns (bytesmemory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/functionfunctionDelegateCall(address target, bytesmemory data, stringmemory errorMessage) internalreturns (bytesmemory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytesmemory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function_verifyCallResult(bool success, bytesmemory returndata, stringmemory errorMessage) privatepurereturns(bytesmemory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if presentif (returndata.length>0) {
// The easiest way to bubble the revert reason is using memory via assembly// solhint-disable-next-line no-inline-assemblyassembly {
let returndata_size :=mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
Contract Source Code
File 2 of 10: CinoV3.sol
// File contracts/CinoV3.solpragmasolidity ^0.6.12;// SPDX-License-Identifier: UNLICENSED/*
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*//*
💰 BE THE HOUSE 💰
CINO Token - Cino is a Token that Rewards Holders with profits from our online casino!
💝 Stake your Cino and get your share of the gross operating profits!
🤖 Telegram https://t.me/Cino_Games
📈 Decentralized Finance meets the casino industry!
🔥 Tokenomics - 10% Tax | 4% To marketing | 6% To the Team
💰 80% of Casino profits back to the stakers!
💫 Virtually no fees after Cardano Block Chain Smart Contract release!
⭐️ Token will be bridged to Cardano and BSC with casino integrations on Cardano!
🔒 42% of Token Supply locked on Unicrypt!
🗣 Community Driven Project and Economy
*/import"@openzeppelin/contracts/GSN/Context.sol";
import"@openzeppelin/contracts/token/ERC20/IERC20.sol";
import"@openzeppelin/contracts/math/SafeMath.sol";
import"@openzeppelin/contracts/utils/Address.sol";
import"@openzeppelin/contracts/access/Ownable.sol";
import"./external/IUniswapV2Router02.sol";
import"./external/IUniswapV2Factory.sol";
import"./external/IUniswapV2Pair.sol";
abstractcontractV1{
functionbalanceOf(address account) publicviewvirtualreturns (uint256);
}
// Contract implementationcontractCinoV3isContext, IERC20, Ownable{
usingSafeMathforuint256;
usingAddressforaddress;
mapping(address=>uint256) private _tOwned;
mapping(address=>mapping(address=>uint256)) private _allowances;
mapping(address=>bool) private _isExcludedFromFee;
mapping(address=>bool) private _isExcluded;
address[] private _excluded;
mapping(address=>bool) private _isBlackListedBot;
address[] private _blackListedBots;
eventExcludeFromFee(addressindexed account, bool isExcluded);
eventExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded);
uint256private _tTotal; //Determined by prior balancesuint256private _tFeeTotal;
stringprivate _name ="Cino Games";
stringprivate _symbol ="CINO";
uint8private _decimals =18;
uint256private launchTime;
addresspayable paymentContractAddress =payable(0xF2FBB896DA2e53Ce7C1391cA003FD8A3277c55aB);
// Tax fees will start at 0 so we don't have a big impact when deploying to Uniswapaddresspayable _tokenTaxWallet =payable(0xE55F6397A171eA6cA1c16cB6811f431bB4422ae0);
uint256public _taxFee =10;
uint256private _previousTaxFee = _taxFee;
addresspayablepublic _taxWalletAddress;
addresspublic _bridgeAdminAddress;
IUniswapV2Router02 publicimmutable uniswapV2Router;
addresspublicimmutable uniswapV2Pair;
bool inSwap =false;
boolpublic swapEnabled =true;
boolpublic autoSwapEnabled =true;
uint256public _maxTxAmount =100000000000*10**18; //no max tx limit rnuint256private _numOfTokensToExchange =10000*10**18;
boolpublic enforceMaxTx =true;
uint256 dropped =0;
eventMinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
eventSwapEnabledUpdated(bool enabled);
modifierlockTheSwap() {
inSwap =true;
_;
inSwap =false;
}
constructor() public{
// Unirouter = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D// PancakeRouter = 0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
); // UniswapV2 for Ethereum network// Create a uniswap pair for this new token
uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
.createPair(address(this), _uniswapV2Router.WETH());
// set the rest of the contract variables
uniswapV2Router = _uniswapV2Router;
// Exclude owner and this contract from fee
_isExcludedFromFee[owner()] =true;
_isExcludedFromFee[address(this)] =true;
_isExcludedFromFee[
address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D)
] =true;
_isExcludedFromFee[address(0xf49b13eCef3C4edd3d1C037C62455988E426aD64)] =true;
launchTime =block.timestamp;
_taxWalletAddress = paymentContractAddress;
_bridgeAdminAddress =0xf49b13eCef3C4edd3d1C037C62455988E426aD64;
uint256 total =100000000000*10**18;
_tTotal = _tTotal.add(total);
_tOwned[_msgSender()] = _tTotal;
// Transferring the equivalent of V1 CINO in the current Liquidity Pool into the dev wallet to provide initial liquidity for V2 as to maintain the market statusemit Transfer(address(0), _msgSender(), _tTotal);
}
functionchangePaymentContract(address newContractAddress) externalonlyOwner{
_taxWalletAddress =payable(newContractAddress);
}
functionchangeTokenTaxWallet(address newTaxWalletAddress) externalonlyOwner{
_tokenTaxWallet =payable(newTaxWalletAddress);
}
function_mint(address account, uint256 amount) internalvirtual{
require(account !=address(0), "ERC20: mint to the zero address");
_tTotal = _tTotal.add(amount);
_tOwned[account] = _tOwned[account].add(amount);
emit Transfer(address(0), account, amount);
}
functionmint(address to, uint256 amount) external{
require(msg.sender== _bridgeAdminAddress, "Only Bridge Administrator");
_mint(to, amount);
}
function_burn(address account, uint256 amount) internalvirtual{
require(account !=address(0), "ERC20: burn from the zero address");
_tOwned[account] = _tOwned[account].sub(
amount,
"ERC20: burn amount exceeds balance"
);
_tTotal = _tTotal.sub(amount);
emit Transfer(account, address(0), amount);
}
functionburn(address owner, uint256 amount) external{
require(msg.sender== _bridgeAdminAddress, "Only Bridge Administrator");
_burn(owner, amount);
}
functionname() publicviewreturns (stringmemory) {
return _name;
}
functionsymbol() publicviewreturns (stringmemory) {
return _symbol;
}
functiondecimals() publicviewreturns (uint8) {
return _decimals;
}
functiontotalSupply() publicviewoverridereturns (uint256) {
return _tTotal;
}
functionbalanceOf(address account) publicviewoverridereturns (uint256) {
return _tOwned[account];
}
functiontransfer(address recipient, uint256 amount)
publicoverridereturns (bool)
{
_transfer(_msgSender(), recipient, amount);
returntrue;
}
functionallowance(address owner, address spender)
publicviewoverridereturns (uint256)
{
return _allowances[owner][spender];
}
functionapprove(address spender, uint256 amount)
publicoverridereturns (bool)
{
_approve(_msgSender(), spender, amount);
returntrue;
}
functiontransferFrom(address sender,
address recipient,
uint256 amount
) publicoverridereturns (bool) {
_transfer(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()].sub(
amount,
"ERC20: transfer amount exceeds allowance"
)
);
returntrue;
}
functionincreaseAllowance(address spender, uint256 addedValue)
publicvirtualreturns (bool)
{
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].add(addedValue)
);
returntrue;
}
functiondecreaseAllowance(address spender, uint256 subtractedValue)
publicvirtualreturns (bool)
{
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].sub(
subtractedValue,
"ERC20: decreased allowance below zero"
)
);
returntrue;
}
functionisExcluded(address account) publicviewreturns (bool) {
return _isExcluded[account];
}
functionisBlackListed(address account) publicviewreturns (bool) {
return _isBlackListedBot[account];
}
functionsetExcludeFromFee(address account, bool excluded)
externalonlyOwner{
_isExcludedFromFee[account] = excluded;
}
functionsetBridgeAdminAddress(address bridgeAddress) externalonlyOwner{
_bridgeAdminAddress = bridgeAddress;
}
functionexcludeMultipleAccountsFromFees(address[] calldata accounts,
bool excluded
) publiconlyOwner{
for (uint256 i =0; i < accounts.length; i++) {
_isExcludedFromFee[accounts[i]] = excluded;
}
emit ExcludeMultipleAccountsFromFees(accounts, excluded);
}
functionsetMaxTxEnforced(bool isMaxTxEnforced)
publiconlyOwnerreturns (bool maxTxEnforced)
{
enforceMaxTx = isMaxTxEnforced;
return enforceMaxTx;
}
functiontotalFees() publicviewreturns (uint256) {
return _tFeeTotal;
}
functionexcludeAccount(address account) externalonlyOwner{
require(
account !=0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D,
"We can not exclude Uniswap router."
);
require(!_isExcluded[account], "Account is already excluded");
_isExcluded[account] =true;
_excluded.push(account);
}
functionincludeAccount(address account) externalonlyOwner{
require(_isExcluded[account], "Account is already excluded");
for (uint256 i =0; i < _excluded.length; i++) {
if (_excluded[i] == account) {
_excluded[i] = _excluded[_excluded.length-1];
_tOwned[account] =0;
_isExcluded[account] =false;
_excluded.pop();
break;
}
}
}
functionaddBotToBlackList(address account) externalonlyOwner{
require(
account !=0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D,
"We can not blacklist Uniswap router."
);
require(!_isBlackListedBot[account], "Account is already blacklisted");
_isBlackListedBot[account] =true;
_blackListedBots.push(account);
}
functionremoveBotFromBlackList(address account) externalonlyOwner{
require(_isBlackListedBot[account], "Account is not blacklisted");
for (uint256 i =0; i < _blackListedBots.length; i++) {
if (_blackListedBots[i] == account) {
_blackListedBots[i] = _blackListedBots[
_blackListedBots.length-1
];
_isBlackListedBot[account] =false;
_blackListedBots.pop();
break;
}
}
}
functionremoveAllFee() private{
if (_taxFee ==0) return;
_previousTaxFee = _taxFee;
_taxFee =0;
}
functionrestoreAllFee() private{
_taxFee = _previousTaxFee;
}
functionisExcludedFromFee(address account) publicviewreturns (bool) {
return _isExcludedFromFee[account];
}
functionsetMaxTxLimit(uint256 maxTxLimit) externalonlyOwner{
_maxTxAmount = maxTxLimit *10**18;
}
functionsetAutoSwapEnabled(bool _autoSwapEnabled) externalonlyOwner{
autoSwapEnabled = _autoSwapEnabled;
}
functionsetNumofTokensForExchange(uint256 numOfTokensToExchange)
externalonlyOwner{
_numOfTokensToExchange = numOfTokensToExchange;
}
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 sender,
address recipient,
uint256 amount
) private{
if (
block.timestamp== launchTime &&
sender != owner() &&
sender !=address(this)
) {
_isBlackListedBot[recipient] =true;
_blackListedBots.push(recipient);
}
require(sender !=address(0), "ERC20: transfer from the zero address");
require(recipient !=address(0), "ERC20: transfer to the zero address");
require(amount >0, "Transfer amount must be greater than zero");
require(!_isBlackListedBot[sender], "You have no power here!");
require(!_isBlackListedBot[recipient], "You have no power here!");
if (sender != owner() && recipient != owner() && enforceMaxTx)
require(
amount <= _maxTxAmount,
"Transfer amount exceeds the maxTxAmount."
);
uint256 contractTokenBalance = balanceOf(address(this));
if (contractTokenBalance >= _maxTxAmount) {
_maxTxAmount = contractTokenBalance;
}
bool overMinTokenBalance = contractTokenBalance >=
_numOfTokensToExchange;
if (
!inSwap &&
swapEnabled &&
overMinTokenBalance &&
sender != uniswapV2Pair &&
autoSwapEnabled
) {
// We need to swap the current tokens to ETH and send to the marketing wallet
swapTokensForEth(contractTokenBalance);
uint256 contractETHBalance =payable(address(this)).balance;
if (contractETHBalance >0) {
sendETHToTaxes(payable(address(this)).balance);
}
} elseif (
!inSwap &&
swapEnabled &&
overMinTokenBalance &&
sender != uniswapV2Pair &&!autoSwapEnabled
) {
_tokenTransfer(
address(this),
_tokenTaxWallet,
contractTokenBalance,
false
);
}
//indicates if fee should be deducted from transferbool takeFee =true;
//if any account belongs to _isExcludedFromFee account then remove the feeif (_isExcludedFromFee[sender] || _isExcludedFromFee[recipient]) {
takeFee =false;
}
//transfer amount, it will take tax fee
_tokenTransfer(sender, recipient, amount, takeFee);
}
functionswapTokensForEth(uint256 tokenAmount) privatelockTheSwap{
//generate the uniswap pair path of CINO -> wETHaddress[] memory path =newaddress[](2);
path[0] =address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), tokenAmount);
// make the swap
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
_taxWalletAddress,
block.timestamp
);
}
functionsendETHToTaxes(uint256 amount) private{
_taxWalletAddress.call.value(amount)("");
}
// We are exposing these functions to be able to manual swap and send// in case the token is highly valued and 5M becomes too muchfunctionmanualSwap() externalonlyOwner{
uint256 contractBalance = balanceOf(address(this));
if (autoSwapEnabled) {
swapTokensForEth(contractBalance);
} else {
_tokenTransfer(
address(this),
_tokenTaxWallet,
contractBalance,
false
);
}
}
functionmanualSend() externalonlyOwner{
uint256 contractETHBalance =payable(address(this)).balance;
sendETHToTaxes(contractETHBalance);
}
functionsetSwapEnabled(bool enabled) externalonlyOwner{
swapEnabled = enabled;
}
function_tokenTransfer(address sender,
address recipient,
uint256 amount,
bool takeFee
) private{
if (!takeFee) removeAllFee();
if (_isExcluded[sender] &&!_isExcluded[recipient]) {
_transferFromExcluded(sender, recipient, amount);
} elseif (!_isExcluded[sender] && _isExcluded[recipient]) {
_transferToExcluded(sender, recipient, amount);
} elseif (!_isExcluded[sender] &&!_isExcluded[recipient]) {
_transferStandard(sender, recipient, amount);
} elseif (_isExcluded[sender] && _isExcluded[recipient]) {
_transferBothExcluded(sender, recipient, amount);
} else {
_transferStandard(sender, recipient, amount);
}
if (!takeFee) restoreAllFee();
}
function_transferStandard(address sender,
address recipient,
uint256 tAmount
) private{
(uint256 tTransferAmount, uint256 tFee) = _getValues(tAmount);
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
_takeTaxes(tFee);
emit Transfer(sender, recipient, tTransferAmount);
}
function_transferToExcluded(address sender,
address recipient,
uint256 tAmount
) private{
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_tOwned[recipient] = _tOwned[recipient].add(tAmount);
emit Transfer(sender, recipient, tAmount);
}
function_transferFromExcluded(address sender,
address recipient,
uint256 tAmount
) private{
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_tOwned[recipient] = _tOwned[recipient].add(tAmount);
emit Transfer(sender, recipient, tAmount);
}
function_transferBothExcluded(address sender,
address recipient,
uint256 tAmount
) private{
_tOwned[sender] = _tOwned[sender].sub(tAmount);
_tOwned[recipient] = _tOwned[recipient].add(tAmount);
emit Transfer(sender, recipient, tAmount);
}
function_takeTaxes(uint256 tTotal) private{
_tOwned[address(this)] = _tOwned[address(this)].add(tTotal);
}
functioncalculateTaxFee(uint256 _amount) privateviewreturns (uint256) {
return _amount.mul(_taxFee).div(10**2);
}
function_reflectFee(uint256 tFee) private{
_tFeeTotal = _tFeeTotal.add(tFee);
}
//to recieve ETH from uniswapV2Router when swappingreceive() externalpayable{}
function_getValues(uint256 tAmount)
privateviewreturns (uint256, uint256)
{
(uint256 tTransferAmount, uint256 tFee) = _getTValues(tAmount);
return (tTransferAmount, tFee);
}
function_getTValues(uint256 tAmount)
privateviewreturns (uint256, uint256)
{
uint256 tFee = calculateTaxFee(tAmount);
uint256 tTransferAmount = tAmount.sub(tFee);
return (tTransferAmount, tFee);
}
function_getTaxFee() privateviewreturns (uint256) {
return _taxFee;
}
function_getMaxTxAmount() privateviewreturns (uint256) {
return _maxTxAmount;
}
function_getETHBalance() publicviewreturns (uint256 balance) {
returnaddress(this).balance;
}
function_setTaxFee(uint256 taxFee) externalonlyOwner{
require(taxFee >=0&& taxFee <=500, "taxFee should be in 1 - 50");
_taxFee = taxFee.div(10);
}
}
// SPDX-License-Identifier: MITpragmasolidity >=0.6.0 <0.8.0;/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/interfaceIERC20{
/**
* @dev Returns the amount of tokens in existence.
*/functiontotalSupply() externalviewreturns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/functionbalanceOf(address account) externalviewreturns (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.
*/functiontransfer(address recipient, uint256 amount) externalreturns (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.
*/functionallowance(address owner, address spender) externalviewreturns (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.
*/functionapprove(address spender, uint256 amount) externalreturns (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.
*/functiontransferFrom(address sender, address recipient, uint256 amount) externalreturns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/eventTransfer(addressindexedfrom, addressindexed 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.
*/eventApproval(addressindexed owner, addressindexed spender, uint256 value);
}
// SPDX-License-Identifier: MITpragmasolidity >=0.6.0 < 0.8.0;import"../utils/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.
*/abstractcontractOwnableisContext{
addressprivate _owner;
eventOwnershipTransferred(addressindexed previousOwner, addressindexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/constructor () internal{
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/functionowner() publicviewvirtualreturns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/modifieronlyOwner() {
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.
*/functionrenounceOwnership() publicvirtualonlyOwner{
emit OwnershipTransferred(_owner, address(0));
_owner =address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/functiontransferOwnership(address newOwner) publicvirtualonlyOwner{
require(newOwner !=address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
Contract Source Code
File 10 of 10: SafeMath.sol
// SPDX-License-Identifier: MITpragmasolidity >=0.6.0 <0.8.0;/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/librarySafeMath{
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/functiontryAdd(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/functiontrySub(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/functiontryMul(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the// benefit is lost if 'b' is also tested.// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522if (a ==0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/functiontryDiv(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
if (b ==0) return (false, 0);
return (true, a / b);
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/functiontryMod(uint256 a, uint256 b) internalpurereturns (bool, uint256) {
if (b ==0) return (false, 0);
return (true, a % b);
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/functionadd(uint256 a, uint256 b) internalpurereturns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/functionsub(uint256 a, uint256 b) internalpurereturns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/functionmul(uint256 a, uint256 b) internalpurereturns (uint256) {
if (a ==0) return0;
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/functiondiv(uint256 a, uint256 b) internalpurereturns (uint256) {
require(b >0, "SafeMath: division by zero");
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/functionmod(uint256 a, uint256 b) internalpurereturns (uint256) {
require(b >0, "SafeMath: modulo by zero");
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/functionsub(uint256 a, uint256 b, stringmemory errorMessage) internalpurereturns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/functiondiv(uint256 a, uint256 b, stringmemory errorMessage) internalpurereturns (uint256) {
require(b >0, errorMessage);
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/functionmod(uint256 a, uint256 b, stringmemory errorMessage) internalpurereturns (uint256) {
require(b >0, errorMessage);
return a % b;
}
}