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// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.
//猫に小判
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address to, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(
address from,
address to,
uint256 amount
) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
interface IERC20Metadata is IERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
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;
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
function name() public view virtual override returns (string memory) {
return _name;
}
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
function decimals() public view virtual override returns (uint8) {
return 18;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
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;
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, _allowances[owner][spender] + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = _allowances[owner][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
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;
}
_balances[to] += amount;
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
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;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
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;
}
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _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);
}
}
}
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
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;
}
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;
}
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);
}
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;
}
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_transferOwnership(_msgSender());
}
function owner() public view virtual returns (address) {
return _owner;
}
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
library SafeMath {
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// 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 (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
contract GoldCoin is ERC20, Ownable {
using SafeMath for uint256;
IUniswapV2Router02 private uniswapV2Router;
address private uniswapV2Pair;
bool private _swapping;
address private _swapFeeReceiver;
uint256 public maxTransactionAmount;
uint256 public maxWallet;
uint256 public swapTokensThreshold;
bool public limitsInEffect = true;
uint256 public totalFees;
uint256 private _marketingFee;
uint256 private _liquidityFee;
uint256 private _protocolFee;
uint256 private _tokensForMarketing;
uint256 private _tokensForLiquidity;
uint256 private _tokensForStaking;
// staking pool vars
uint256 public totalStaked;
address public stakingToken;
address public rewardToken;
uint256 [] public apr;
bool public stakingEnabled = false;
uint256 public totalClaimed;
struct Staking {
uint256 creationTime;
uint256 staked;
}
struct Staker {
address staker;
uint256 start;
uint256 staked;
uint256 earned;
}
struct ClaimHistory {
uint256[] dates;
uint256[] amounts;
}
// exlcude from fees and max transaction amount
mapping (address => bool) private _isExcludedFromFees;
mapping (address => bool) private _isExcludedMaxTransactionAmount;
// store addresses that a automatic market maker pairs. Any transfer *to* these addresses
// could be subject to a maximum transfer amount
mapping (address => bool) private _automatedMarketMakerPairs;
// to stop bot spam buys and sells on launch
mapping(address => uint256) private _holderLastTransferBlock;
// stake data
mapping(address => mapping(uint256 => Staker)) private _stakers;
mapping(address => ClaimHistory) private _claimHistory;
Staking[] public stakings;
/**
* @dev Throws if called by any account other than the _swapFeeReceiver
*/
modifier teamOROwner() {
require(_swapFeeReceiver == _msgSender() || owner() == _msgSender(), "Caller is not the _swapFeeReceiver address nor owner.");
_;
}
modifier isStakingEnabled() {
require(stakingEnabled, "Staking is not enabled.");
_;
}
constructor() ERC20(unicode"Gold Coin - 猫に小判", "GC") payable {
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
_isExcludedMaxTransactionAmount[address(_uniswapV2Router)] = true;
uniswapV2Router = _uniswapV2Router;
uint256 marketingFee = 0;
uint256 liquidityFee = 0;
uint256 protocolFee = 0;
uint256 totalSupply = 5e11 * 1e18;
maxTransactionAmount = totalSupply * 1 / 100;
maxWallet = totalSupply * 2 / 100;
swapTokensThreshold = totalSupply * 1 / 1000;
_marketingFee = marketingFee;
_liquidityFee = liquidityFee;
_protocolFee = protocolFee;
totalFees = _marketingFee + _liquidityFee + _protocolFee;
_swapFeeReceiver = owner();
// exclude from paying fees or having max transaction amount
excludeFromFees(owner(), true);
excludeFromFees(address(this), true);
excludeFromFees(address(0xdead), true);
_isExcludedMaxTransactionAmount[owner()] = true;
_isExcludedMaxTransactionAmount[address(this)] = true;
_isExcludedMaxTransactionAmount[address(0xdead)] = true;
stakingToken = address(this);
rewardToken = address(this);
apr.push(77);
_mint(address(this), totalSupply);
}
/**
* @dev Once live, can never be switched off
*/
function startTrading() external teamOROwner {
uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
_isExcludedMaxTransactionAmount[address(uniswapV2Pair)] = true;
_automatedMarketMakerPairs[address(uniswapV2Pair)] = true;
_approve(address(this), address(uniswapV2Router), balanceOf(address(this)));
uniswapV2Router.addLiquidityETH{value: address(this).balance} (
address(this),
balanceOf(address(this)),
0,
0,
owner(),
block.timestamp
);
}
/**
* @dev Remove limits after token is somewhat stable
*/
function removeLimits() external teamOROwner {
limitsInEffect = false;
}
/**
* @dev Exclude from fee calculation
*/
function excludeFromFees(address account, bool excluded) public teamOROwner {
_isExcludedFromFees[account] = excluded;
}
/**
* @dev Update token fees (max set to initial fee)
*/
function updateFees(uint256 marketingFee, uint256 liquidityFee, uint256 protocolFee) external onlyOwner {
_marketingFee = marketingFee;
_liquidityFee = liquidityFee;
_protocolFee = protocolFee;
totalFees = _marketingFee + _liquidityFee + _protocolFee;
require(totalFees <= 10, "Must keep fees at 10% or less");
}
function addStakingAPR(uint256 _apr) external onlyOwner {
require (_apr != 0, "can not update apr to zero!");
apr.push(_apr);
}
function decreaseStakingAPR() external onlyOwner {
apr.pop();
}
function updateStakingAPR (uint256 _apr, uint256 _index) external onlyOwner {
require (apr[_index] != _apr, "can not update apr to same value!");
apr[_index] = _apr;
}
/**
* @dev Update wallet that receives fees and newly added LP
*/
function updateFeeReceiver(address newWallet) external teamOROwner {
_swapFeeReceiver = newWallet;
}
/**
* @dev Very important function.
* Updates the threshold of how many tokens that must be in the contract calculation for fees to be taken
*/
function updateSwapTokensThreshold(uint256 newThreshold) external teamOROwner returns (bool) {
require(newThreshold >= totalSupply() * 1 / 100000, "Swap threshold cannot be lower than 0.001% total supply.");
require(newThreshold <= totalSupply() * 5 / 1000, "Swap threshold cannot be higher than 0.5% total supply.");
swapTokensThreshold = newThreshold;
return true;
}
/**
* @dev Check if an address is excluded from the fee calculation
*/
function isExcludedFromFees(address account) external view returns(bool) {
return _isExcludedFromFees[account];
}
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");
if (amount == 0) {
super._transfer(from, to, 0);
return;
}
// all to secure a smooth launch
if (limitsInEffect) {
if (
from != owner() &&
to != owner() &&
to != address(0xdead) &&
!_swapping
) {
if (to != owner() && to != address(uniswapV2Router) && to != address(uniswapV2Pair)){
require(_holderLastTransferBlock[tx.origin] < block.number, "_transfer:: Transfer Delay enabled. Only one purchase per block allowed.");
_holderLastTransferBlock[tx.origin] = block.number;
}
// on buy
if (_automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
require(amount <= maxTransactionAmount, "_transfer:: Buy transfer amount exceeds the maxTransactionAmount.");
require(amount + balanceOf(to) <= maxWallet, "_transfer:: Max wallet exceeded");
}
// on sell
else if (_automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
require(amount <= maxTransactionAmount, "_transfer:: Sell transfer amount exceeds the maxTransactionAmount.");
}
else if (!_isExcludedMaxTransactionAmount[to]) {
require(amount + balanceOf(to) <= maxWallet, "_transfer:: Max wallet exceeded");
}
}
}
uint256 contractTokenBalance = balanceOf(address(this));
bool canSwap = contractTokenBalance >= swapTokensThreshold;
if (
canSwap &&
!_swapping &&
!_automatedMarketMakerPairs[from] &&
!_isExcludedFromFees[from] &&
!_isExcludedFromFees[to]
) {
_swapping = true;
swapBack();
_swapping = false;
}
bool takeFee = !_swapping;
// if any addy belongs to _isExcludedFromFee or isn't a swap then remove the fee
if (
_isExcludedFromFees[from] ||
_isExcludedFromFees[to] ||
(!_automatedMarketMakerPairs[from] && !_automatedMarketMakerPairs[to])
) takeFee = false;
uint256 fees = 0;
if (takeFee) {
fees = amount.mul(totalFees).div(100);
_tokensForLiquidity += fees * _liquidityFee / totalFees;
_tokensForStaking += fees * _protocolFee / totalFees;
_tokensForMarketing += fees * _marketingFee / totalFees;
if (fees > 0) {
super._transfer(from, address(this), fees);
}
amount -= fees;
}
super._transfer(from, to, amount);
}
function _swapTokensForEth(uint256 tokenAmount) internal {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), tokenAmount);
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0,
path,
address(this),
block.timestamp
);
}
function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) internal {
_approve(address(this), address(uniswapV2Router), tokenAmount);
uniswapV2Router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0,
0,
_swapFeeReceiver,
block.timestamp
);
}
function swapBack() internal {
uint256 contractBalance = balanceOf(address(this));
uint256 totalTokensToSwap = _tokensForLiquidity + _tokensForMarketing + _tokensForStaking;
if (contractBalance == 0 || totalTokensToSwap == 0) return;
if (contractBalance > swapTokensThreshold) contractBalance = swapTokensThreshold;
// half of the amount of liquidity tokens
uint256 liquidityTokens = contractBalance * _tokensForLiquidity / totalTokensToSwap / 2;
uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens);
uint256 initialETHBalance = address(this).balance;
_swapTokensForEth(amountToSwapForETH);
uint256 ethBalance = address(this).balance.sub(initialETHBalance);
uint256 ethForMarketing = ethBalance.mul(_tokensForMarketing).div(totalTokensToSwap);
uint256 ethForStaking = ethBalance.mul(_tokensForStaking).div(totalTokensToSwap);
uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForStaking;
_tokensForLiquidity = 0;
_tokensForMarketing = 0;
_tokensForStaking = 0;
payable(_swapFeeReceiver).transfer(ethForMarketing.add(ethForStaking));
if (liquidityTokens > 0 && ethForLiquidity > 0) {
_addLiquidity(liquidityTokens, ethForLiquidity);
}
}
/**
* @dev Transfer eth stuck in contract to _swapFeeReceiver
*/
function withdrawContractETH() external {
payable(_swapFeeReceiver).transfer(address(this).balance);
}
/**
* @dev In case swap wont do it and sells/buys might be blocked
*/
function forceSwap() external teamOROwner {
_swapTokensForEth(balanceOf(address(this)));
}
/**
*
* @dev Staking part starts here
*
*/
/**
* @dev Checks if holder is staking
*/
function isStaking(address stakerAddr, uint256 staking) public view returns (bool) {
return _stakers[stakerAddr][staking].staker == stakerAddr;
}
/**
* @dev Returns how much staker is staking
*/
function userStaked(address staker, uint256 staking) public view returns (uint256) {
return _stakers[staker][staking].staked;
}
/**
* @dev Returns how much staker has claimed over time
*/
function userClaimHistory(address staker) public view returns (ClaimHistory memory) {
return _claimHistory[staker];
}
/**
* @dev Returns how much staker has earned
*/
function userEarned(address staker, uint256 staking) public view returns (uint256) {
uint256 currentlyEarned = _userEarned(staker, staking);
uint256 previouslyEarned = _stakers[msg.sender][staking].earned;
if (previouslyEarned > 0) return currentlyEarned.add(previouslyEarned);
return currentlyEarned;
}
function _userEarned(address staker, uint256 staking) private view returns (uint256) {
require(isStaking(staker, staking), "User is not staking.");
uint256 staked = userStaked(staker, staking);
uint256 stakersStartInSeconds = _stakers[staker][staking].start.div(1 seconds);
uint256 blockTimestampInSeconds = block.timestamp.div(1 seconds);
uint256 secondsStaked = blockTimestampInSeconds.sub(stakersStartInSeconds);
uint256 earn = staked.mul(apr[staking]).div(100);
uint256 rewardPerSec = earn.div(365).div(24).div(60).div(60);
uint256 earned = rewardPerSec.mul(secondsStaked);
return earned;
}
/**
* @dev Stake tokens in staking
*/
function stake(uint256 stakeAmount, uint256 staking) external isStakingEnabled {
// Check user is registered as staker
if (isStaking(msg.sender, staking)) {
_stakers[msg.sender][staking].staked += stakeAmount;
_stakers[msg.sender][staking].earned += _userEarned(msg.sender, staking);
_stakers[msg.sender][staking].start = block.timestamp;
} else {
_stakers[msg.sender][staking] = Staker(msg.sender, block.timestamp, stakeAmount, 0);
}
stakings[staking].staked += stakeAmount;
totalStaked += stakeAmount;
_burn(msg.sender, stakeAmount);
}
/**
* @dev Claim earned tokens from stake in staking
*/
function claim(uint256 staking) external isStakingEnabled {
require(isStaking(msg.sender, staking), "You are not staking!?");
uint256 reward = userEarned(msg.sender, staking);
_claimHistory[msg.sender].dates.push(block.timestamp);
_claimHistory[msg.sender].amounts.push(reward);
totalClaimed += reward;
_mint(msg.sender, reward);
_stakers[msg.sender][staking].start = block.timestamp;
_stakers[msg.sender][staking].earned = 0;
}
/**
* @dev Claim earned and staked tokens from staking
*/
function unstake(uint256 staking) external {
require(isStaking(msg.sender, staking), "You are not staking!?");
uint256 reward = userEarned(msg.sender, staking);
if (stakingEnabled) {
_claimHistory[msg.sender].dates.push(block.timestamp);
_claimHistory[msg.sender].amounts.push(reward);
totalClaimed += reward;
_mint(msg.sender, _stakers[msg.sender][staking].staked.add(reward));
} else {
_mint(msg.sender, _stakers[msg.sender][staking].staked);
}
stakings[staking].staked -= _stakers[msg.sender][staking].staked;
totalStaked -= _stakers[msg.sender][staking].staked;
delete _stakers[msg.sender][staking];
}
/**
* @dev Creates staking
*/
function createStaking() external teamOROwner {
Staking memory staking = Staking(block.timestamp, 0);
stakings.push(staking);
}
/**
* @dev Returns amount of stakings
*/
function amountOfStakings() public view returns (uint256) {
return stakings.length;
}
/**
* @dev Enables/disables staking
*/
function setStakingState(bool onoff) external teamOROwner {
stakingEnabled = onoff;
}
receive() external payable {}
} |