Contract Source Code:
pragma solidity ^0.6.12;
import "./libraries/ReflectToken.sol";
import "./libraries/Percent.sol";
import "./libraries/Set.sol";
import "./interfaces/IUniswapV2Factory.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./interfaces/IUniswapV2Router02.sol";
import "./interfaces/ILedgity.sol";
import "./interfaces/IReserve.sol";
import "./interfaces/ILedgityPriceOracle.sol";
// SPDX-License-Identifier: Unlicensed
contract Ledgity is ILedgity, ReflectToken {
using SafeMath for uint256;
using Percent for Percent.Percent;
using Set for Set.AddressSet;
uint256 public constant initialTotalSupply = 2760000000 * 10**18;
uint256 public numTokensToSwap;
bool public inSwapAndLiquify;
enum FeeDestination {
Liquify,
Collect
}
FeeDestination public feeDestination = FeeDestination.Liquify;
Percent.Percent public sellAccumulationFee = Percent.encode(6, 100);
Percent.Percent public initialSellAccumulationFee = sellAccumulationFee;
Percent.Percent public sellAtSmallPriceAccumulationFee = Percent.encode(6 + 15, 100);
Percent.Percent public initialSellAtSmallPriceAccumulationFee = sellAtSmallPriceAccumulationFee;
Percent.Percent public sellReflectionFee = Percent.encode(4, 100);
Percent.Percent public initialSellReflectionFee = sellReflectionFee;
Percent.Percent public buyAccumulationFee = Percent.encode(4, 100);
Percent.Percent public initialBuyAccumulationFee = buyAccumulationFee;
Set.AddressSet private _dexes;
Set.AddressSet private _excludedFromDexFee;
Set.AddressSet private _excludedFromLimits;
mapping(address => uint256) public soldPerPeriod;
mapping(address => uint256) public firstSellAt;
Percent.Percent public maxTransactionSizePercent = Percent.encode(5, 10000);
IUniswapV2Pair public uniswapV2Pair;
IReserve public reserve;
ILedgityPriceOracle public priceOracle;
uint256 public initialPrice;
constructor() public ReflectToken("Ledgity", "LTY", initialTotalSupply) {
numTokensToSwap = totalSupply().mul(15).div(10000);
setIsExcludedFromDexFee(owner(), true);
setIsExcludedFromDexFee(address(this), true);
setIsExcludedFromLimits(owner(), true);
setIsExcludedFromLimits(address(this), true);
excludeAccount(address(this));
}
modifier lockTheSwap {
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
}
function initializeReserve(address reserveAddress) external onlyOwner {
reserve = IReserve(reserveAddress);
setIsExcludedFromDexFee(address(reserve), true);
setIsExcludedFromLimits(address(reserve), true);
excludeAccount(address(reserve));
uniswapV2Pair = reserve.uniswapV2Pair();
setDex(address(uniswapV2Pair), true);
}
function initializePriceOracle(address priceOracleAddress) external onlyOwner {
priceOracle = ILedgityPriceOracle(priceOracleAddress);
if (initialPrice == 0) {
initialPrice = _getPrice();
}
}
function totalBurn() external view returns (uint256) {
return initialTotalSupply - totalSupply();
}
function setDex(address target, bool dex) public onlyOwner {
if (dex) {
_dexes.add(target);
if (!isExcluded(target)) {
excludeAccount(target);
}
} else {
_dexes.remove(target);
if (isExcluded(target)) {
includeAccount(target);
}
}
}
function setFeeDestination(FeeDestination fd) public onlyOwner {
feeDestination = fd;
}
function setIsExcludedFromDexFee(address account, bool isExcluded) public onlyOwner {
if (isExcluded) {
_excludedFromDexFee.add(account);
} else {
_excludedFromDexFee.remove(account);
}
}
function setIsExcludedFromLimits(address account, bool isExcluded) public onlyOwner {
if (isExcluded) {
_excludedFromLimits.add(account);
} else {
_excludedFromLimits.remove(account);
}
}
function setNumTokensToSwap(uint256 _numTokensToSwap) external onlyOwner {
numTokensToSwap = _numTokensToSwap;
}
function setMaxTransactionSizePercent(uint128 numerator, uint128 denominator) external onlyOwner {
maxTransactionSizePercent = Percent.encode(numerator, denominator);
}
function setSellAccumulationFee(uint128 numerator, uint128 denominator) external onlyOwner {
sellAccumulationFee = Percent.encode(numerator, denominator);
require(sellAccumulationFee.lte(initialSellAccumulationFee), "Ledgity: fee too high");
}
function setSellAtSmallPriceAccumulationFee(uint128 numerator, uint128 denominator) external onlyOwner {
sellAtSmallPriceAccumulationFee = Percent.encode(numerator, denominator);
require(sellAtSmallPriceAccumulationFee.lte(initialSellAtSmallPriceAccumulationFee), "Ledgity: fee too high");
}
function setSellReflectionFee(uint128 numerator, uint128 denominator) external onlyOwner {
sellReflectionFee = Percent.encode(numerator, denominator);
require(sellReflectionFee.lte(initialSellReflectionFee), "Ledgity: fee too high");
}
function setBuyAccumulationFee(uint128 numerator, uint128 denominator) external onlyOwner {
buyAccumulationFee = Percent.encode(numerator, denominator);
require(buyAccumulationFee.lte(initialBuyAccumulationFee), "Ledgity: fee too high");
}
function burn(uint256 amount) external override returns (bool) {
_burn(_msgSender(), amount);
return true;
}
function getDexes() external view returns (address[] memory) {
return _dexes.values;
}
function getExcludedFromDexFee() external view returns (address[] memory) {
return _excludedFromDexFee.values;
}
function getExcludedFromLimits() external view returns (address[] memory) {
return _excludedFromLimits.values;
}
function isDex(address account) public view returns (bool) {
return _dexes.has(account);
}
function isExcludedFromDexFee(address account) public view returns (bool) {
return _excludedFromDexFee.has(account);
}
function isExcludedFromLimits(address account) public view returns (bool) {
return _excludedFromLimits.has(account);
}
function _calculateReflectionFee(address sender, address recipient, uint256 amount) internal override view returns (uint256) {
if (isDex(recipient) && !isExcludedFromDexFee(sender)) {
return sellReflectionFee.mul(amount);
}
return 0;
}
function _calculateAccumulationFee(address sender, address recipient, uint256 amount) internal override view returns (uint256) {
if (isDex(sender) && !isExcludedFromDexFee(recipient)) {
return buyAccumulationFee.mul(amount);
}
if (isDex(recipient) && !isExcludedFromDexFee(sender)) {
if (_getPrice() >= initialPrice.mul(10)) {
return sellAccumulationFee.mul(amount);
} else {
return sellAtSmallPriceAccumulationFee.mul(amount);
}
}
return 0;
}
function _swapAndLiquifyOrCollect(uint256 contractTokenBalance) private lockTheSwap {
_transfer(address(this), address(reserve), contractTokenBalance);
if (feeDestination == FeeDestination.Liquify) {
reserve.swapAndLiquify(contractTokenBalance);
} else if (feeDestination == FeeDestination.Collect) {
reserve.swapAndCollect(contractTokenBalance);
} else {
revert("Ledgity: invalid feeDestination");
}
}
function _transfer(address sender, address recipient, uint256 amount) internal override {
if (!isExcludedFromLimits(sender) && isDex(recipient)) {
uint256 _sold;
if (block.timestamp.sub(firstSellAt[sender]) > 10 minutes) {
// _sold = 0; // is already 0
firstSellAt[sender] = block.timestamp;
} else {
_sold = soldPerPeriod[sender];
}
_sold = _sold.add(amount);
require(_sold <= maxTransactionSize());
soldPerPeriod[sender] = _sold;
}
if (address(priceOracle) != address(0)) {
priceOracle.tryUpdate();
}
uint256 contractTokenBalance = balanceOf(address(this));
uint256 _numTokensToSwap = numTokensToSwap;
if (
contractTokenBalance >= _numTokensToSwap &&
!inSwapAndLiquify &&
sender != address(uniswapV2Pair)
) {
if (contractTokenBalance > _numTokensToSwap) {
contractTokenBalance = _numTokensToSwap;
}
_swapAndLiquifyOrCollect(contractTokenBalance);
}
super._transfer(sender, recipient, amount);
}
function _getPrice() private view returns (uint256) {
if (address(priceOracle) == address(0)) {
return 0;
}
return priceOracle.consult(address(this), 1e18);
}
function maxTransactionSize() public view returns (uint256) {
return maxTransactionSizePercent.mul(totalSupply());
}
}
pragma solidity ^0.6.12;
import "./Context.sol";
import "./SafeMath.sol";
import "./Ownable.sol";
import "../interfaces/IERC20.sol";
abstract contract ReflectToken is Context, IERC20, Ownable {
using SafeMath for uint256;
mapping (address => uint256) private _rOwned;
mapping (address => uint256) private _tOwned;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private _isExcluded;
address[] private _excluded;
uint8 private constant _decimals = 18;
uint256 private _tTotal;
uint256 private _rTotal;
uint256 private _tFeeTotal;
string private _name;
string private _symbol;
constructor (string memory name_, string memory symbol_, uint256 tTotal_) public {
_name = name_;
_symbol = symbol_;
_tTotal = tTotal_;
uint256 MAX = type(uint256).max;
_rTotal = (MAX - (MAX % _tTotal));
_rOwned[_msgSender()] = _rTotal;
emit Transfer(address(0), _msgSender(), _tTotal);
}
/**
* @dev Amount of tokens to be charged as a reflection fee. Must be in range 0..amount.
*/
function _calculateReflectionFee(address sender, address recipient, uint256 amount) internal virtual view returns (uint256);
/**
* @dev Amount of tokens to be charged and stored in this contract. Must be in range 0..amount.
*/
function _calculateAccumulationFee(address sender, address recipient, uint256 amount) internal virtual view returns (uint256);
function name() external view returns (string memory) {
return _name;
}
function symbol() external view returns (string memory) {
return _symbol;
}
function decimals() external view returns (uint8) {
return _decimals;
}
function totalSupply() public view override returns (uint256) {
return _tTotal;
}
function balanceOf(address account) public view override returns (uint256) {
if (_isExcluded[account]) return _tOwned[account];
return tokenFromReflection(_rOwned[account]);
}
function transfer(address recipient, uint256 amount) external override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) external view override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) external override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ReflectToken: transfer amount exceeds allowance"));
return true;
}
function increaseAllowance(address spender, uint256 addedValue) external virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) external virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ReflectToken: decreased allowance below zero"));
return true;
}
function getExcluded() external view returns (address[] memory) {
return _excluded;
}
function isExcluded(address account) public view returns (bool) {
return _isExcluded[account];
}
function totalFees() external view returns (uint256) {
return _tFeeTotal;
}
function reflect(uint256 tAmount) external {
address sender = _msgSender();
require(!_isExcluded[sender], "ReflectToken: excluded addresses cannot call this function");
(uint256 rAmount,,,,,,) = _getValues(sender, address(0), tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
_rTotal = _rTotal.sub(rAmount);
_tFeeTotal = _tFeeTotal.add(tAmount);
}
function reflectionFromToken(uint256 tAmount, bool deductTransferFee) external view returns(uint256) {
require(tAmount <= _tTotal, "ReflectToken: amount must be less than supply");
address sender = _msgSender();
if (!deductTransferFee) {
(uint256 rAmount,,,,,,) = _getValues(sender, address(0), tAmount);
return rAmount;
} else {
(,uint256 rTransferAmount,,,,,) = _getValues(sender, address(0), tAmount);
return rTransferAmount;
}
}
function tokenFromReflection(uint256 rAmount) public view returns(uint256) {
require(rAmount <= _rTotal, "ReflectToken: amount must be less than total reflections");
uint256 currentRate = _getRate();
return rAmount.div(currentRate);
}
function excludeAccount(address account) public onlyOwner() {
require(!_isExcluded[account], "ReflectToken: account is already excluded");
if(_rOwned[account] > 0) {
_tOwned[account] = tokenFromReflection(_rOwned[account]);
}
_isExcluded[account] = true;
_excluded.push(account);
}
function includeAccount(address account) public onlyOwner() {
require(_isExcluded[account], "ReflectToken: account is already included");
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;
}
}
}
function _approve(address owner, address spender, uint256 amount) private {
require(owner != address(0), "ReflectToken: approve from the zero address");
require(spender != address(0), "ReflectToken: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _burn(address from, uint256 tAmount) internal {
uint256 rAmount = tAmount.mul(_getRate());
_rOwned[from] = _rOwned[from].sub(rAmount, "ReflectToken: burn amount is more than the balance");
if (_isExcluded[from]) {
_tOwned[from] = _tOwned[from].sub(tAmount, "ReflectToken: burn amount is more than the balance");
}
_rTotal = _rTotal.sub(rAmount);
_tTotal = _tTotal.sub(tAmount);
emit Transfer(_msgSender(), address(0), tAmount);
}
function _transfer(address sender, address recipient, uint256 tAmount) internal virtual {
require(sender != address(0), "ReflectToken: transfer from the zero address");
require(recipient != address(0), "ReflectToken: transfer to the zero address");
require(tAmount > 0, "ReflectToken: transfer amount must be greater than zero");
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 rAccumulation, uint256 tTransferAmount, uint256 tFee, uint256 tAccumulation) = _getValues(sender, recipient, tAmount);
_rOwned[sender] = _rOwned[sender].sub(rAmount);
if (_isExcluded[sender]) {
_tOwned[sender] = _tOwned[sender].sub(tAmount);
}
_rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);
if (_isExcluded[recipient]) {
_tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);
}
if (tFee != 0) {
_reflectFee(rFee, tFee);
}
if (tAccumulation != 0) {
_accumulateFee(rAccumulation, tAccumulation);
}
emit Transfer(sender, recipient, tTransferAmount);
}
function _reflectFee(uint256 rFee, uint256 tFee) private {
_rTotal = _rTotal.sub(rFee);
_tFeeTotal = _tFeeTotal.add(tFee);
}
function _accumulateFee(uint256 rAccumulation, uint256 tAccumulation) private {
_rOwned[address(this)] = _rOwned[address(this)].add(rAccumulation);
if(_isExcluded[address(this)]) {
_tOwned[address(this)] = _tOwned[address(this)].add(tAccumulation);
}
}
function _getValues(address sender, address recipient, uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256, uint256) {
(uint256 tTransferAmount, uint256 tFee, uint256 tAccumulation) = _getTValues(sender, recipient, tAmount);
(uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 rAccumulation) = _getRValues(tAmount, tFee, tAccumulation);
return (rAmount, rTransferAmount, rFee, rAccumulation, tTransferAmount, tFee, tAccumulation);
}
function _getTValues(address sender, address recipient, uint256 tAmount) private view returns (uint256, uint256, uint256) {
uint256 tFee = _calculateReflectionFee(sender, recipient, tAmount);
uint256 tAccumulation = _calculateAccumulationFee(sender, recipient, tAmount);
uint256 tTransferAmount = tAmount.sub(tFee).sub(tAccumulation);
return (tTransferAmount, tFee, tAccumulation);
}
function _getRValues(uint256 tAmount, uint256 tFee, uint256 tAccumulation) private view returns (uint256, uint256, uint256, uint256) {
uint256 currentRate = _getRate();
uint256 rAmount = tAmount.mul(currentRate);
uint256 rFee = tFee.mul(currentRate);
uint256 rAccumulation = tAccumulation.mul(currentRate);
uint256 rTransferAmount = rAmount.sub(rFee).sub(rAccumulation);
return (rAmount, rTransferAmount, rFee, rAccumulation);
}
function _getRate() private view returns(uint256) {
(uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
return rSupply.div(tSupply);
}
function _getCurrentSupply() private view returns(uint256, uint256) {
uint256 rSupply = _rTotal;
uint256 tSupply = _tTotal;
uint256 len = _excluded.length;
for (uint256 i = 0; i < len; i++) {
address account = _excluded[i];
uint256 rBalance = _rOwned[account];
uint256 tBalance = _tOwned[account];
if (rBalance > rSupply || tBalance > tSupply) return (_rTotal, _tTotal);
rSupply = rSupply.sub(rBalance);
tSupply = tSupply.sub(tBalance);
}
if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);
return (rSupply, tSupply);
}
}
pragma solidity ^0.6.12;
import "./SafeMath.sol";
library Percent {
using SafeMath for uint256;
struct Percent {
uint128 numerator;
uint128 denominator;
}
function encode(uint128 numerator, uint128 denominator) internal pure returns (Percent memory) {
require(numerator <= denominator, "Percent: invalid percentage");
return Percent(numerator, denominator);
}
function mul(Percent memory self, uint256 value) internal pure returns (uint256) {
return value.mul(uint256(self.numerator)).div(uint256(self.denominator));
}
function lte(Percent memory self, Percent memory other) internal pure returns (bool) {
return uint256(self.numerator).mul(other.denominator) <= uint256(other.numerator).mul(self.denominator);
}
}
pragma solidity ^0.6.12;
library Set {
/// @title Set data structure
/// @dev Supports `add`, `remove` and `has` methods. Use `values` property to iterate over values. Do not edit properties directly.
struct AddressSet {
address[] values;
mapping(address => uint256) _valueIndexPlusOne;
}
/// @dev Adds a value to the set.
/// @return `true` if the value was successfully added; `false` if the value was already in the set.
function add(AddressSet storage set, address value) internal returns (bool) {
if (set._valueIndexPlusOne[value] != 0) {
return false;
}
set.values.push(value);
set._valueIndexPlusOne[value] = set.values.length; // length == last_index + 1
return true;
}
/// @dev Removes a value from the set.
/// @return `true` if value was successfully removed; `false` if the value was not in the set.
function remove(AddressSet storage set, address value) internal returns (bool) {
if (set._valueIndexPlusOne[value] == 0) {
return false;
}
uint256 valueToRemoveIndexPlusOne = set._valueIndexPlusOne[value];
uint256 lastValueIndex = set.values.length - 1;
// Swap indices
set._valueIndexPlusOne[set.values[lastValueIndex]] = valueToRemoveIndexPlusOne;
delete set._valueIndexPlusOne[value];
// Move the last value to the deleted spot
set.values[valueToRemoveIndexPlusOne - 1] = set.values[lastValueIndex];
// Delete the duplicated last value
set.values.pop();
return true;
}
/// @dev Checks if a value is in the set.
/// @return `true` if the value is in the set; `false` if the value is not in the set.
function has(AddressSet storage set, address value) internal view returns (bool) {
return set._valueIndexPlusOne[value] != 0;
}
}
pragma solidity ^0.6.12;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
pragma solidity ^0.6.12;
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
pragma solidity ^0.6.12;
import "./IUniswapV2Router01.sol";
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
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;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
pragma solidity ^0.6.12;
import "./IERC20.sol";
interface ILedgity is IERC20 {
function burn(uint256 amount) external returns (bool);
}
pragma solidity ^0.6.12;
import "./IUniswapV2Pair.sol";
interface IReserve {
function uniswapV2Pair() external returns (IUniswapV2Pair);
/**
* @dev Returns the amount of tokens in existence.
*/
function swapAndCollect(uint256 tokenAmount) external;
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function swapAndLiquify(uint256 tokenAmount) external;
/**
* @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 buyAndBurn(uint256 usdcAmount) external;
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event BuyAndBurn(uint256 tokenAmount, uint256 usdcAmount);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event SwapAndCollect(uint256 tokenAmount, uint256 usdcAmount);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event SwapAndLiquify(
uint256 tokenSwapped,
uint256 usdcReceived,
uint256 tokensIntoLiqudity
);
}
pragma solidity ^0.6.12;
interface ILedgityPriceOracle {
/**
* @dev Update average price.
* @return `true` if update successful; `false` if period has not yet elapsed.
*/
function tryUpdate() external returns (bool);
/**
* @dev Update average price. Reverts if period has not yet elapsed.
*/
function update() external;
/**
* @dev Returns the price of tokens.
*/
function consult(address token, uint amountIn) external view returns (uint amountOut);
}
pragma solidity ^0.6.12;
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
pragma solidity ^0.6.12;
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (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.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (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/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message 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.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
}
pragma solidity ^0.6.12;
import "./Context.sol";
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 () public {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
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() external virtual onlyOwner {
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.
*/
function transferOwnership(address newOwner) external virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
pragma solidity ^0.6.12;
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);
}
pragma solidity ^0.6.12;
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}