Contract Name:
ArcadiumToken
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./libs/ERC20.sol";
import "./libs/IERC20.sol";
import "./libs/SafeERC20.sol";
import "./libs/IWETH.sol";
import "./libs/AddLiquidityHelper.sol";
import "./libs/RHCPToolBox.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
// ArcadiumToken.
contract ArcadiumToken is ERC20("ARCADIUM", "ARCADIUM") {
using SafeERC20 for IERC20;
// Transfer tax rate in basis points. (default 6.66%)
uint16 public transferTaxRate = 666;
// Extra transfer tax rate in basis points. (default 2.00%)
uint16 public extraTransferTaxRate = 200;
// Burn rate % of transfer tax. (default 54.95% x 6.66% = 3.660336% of total amount).
uint32 public constant burnRate = 549549549;
// Max transfer tax rate: 10.01%.
uint16 public constant MAXIMUM_TRANSFER_TAX_RATE = 1001;
// Burn address
address public constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;
address public constant usdcCurrencyAddress = 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174;
uint256 public constant usdcSwapThreshold = 20 * (10 ** 6);
// Automatic swap and liquify enabled
bool public swapAndLiquifyEnabled = true;
// Min amount to liquify. (default 40 ARCADIUMs)
uint256 public constant minArcadiumAmountToLiquify = 40 * (10 ** 18);
// Min amount to liquify. (default 100 MATIC)
uint256 public constant minMaticAmountToLiquify = 100 * (10 ** 18);
IUniswapV2Router02 public arcadiumSwapRouter;
// The trading pair
address public arcadiumSwapPair;
// In swap and liquify
bool private _inSwapAndLiquify;
AddLiquidityHelper public immutable addLiquidityHelper;
RHCPToolBox public immutable arcadiumToolBox;
IERC20 public immutable usdcRewardCurrency;
address public immutable myFriends;
bool public ownershipIsTransferred = false;
mapping(address => bool) public excludeFromMap;
mapping(address => bool) public excludeToMap;
mapping(address => bool) public extraFromMap;
mapping(address => bool) public extraToMap;
event SetSwapAndLiquifyEnabled(bool swapAndLiquifyEnabled);
event TransferFeeChanged(uint256 txnFee, uint256 extraTxnFee);
event UpdateFeeMaps(address _contract, bool fromExcluded, bool toExcluded, bool fromHasExtra, bool toHasExtra);
event SetArcadiumRouter(address arcadiumSwapRouter, address arcadiumSwapPair);
event SetOperator(address operator);
// The operator can only update the transfer tax rate
address private _operator;
modifier onlyOperator() {
require(_operator == msg.sender, "!operator");
_;
}
modifier lockTheSwap {
_inSwapAndLiquify = true;
_;
_inSwapAndLiquify = false;
}
modifier transferTaxFree {
uint16 _transferTaxRate = transferTaxRate;
uint16 _extraTransferTaxRate = extraTransferTaxRate;
transferTaxRate = 0;
extraTransferTaxRate = 0;
_;
transferTaxRate = _transferTaxRate;
extraTransferTaxRate = _extraTransferTaxRate;
}
/**
* @notice Constructs the ArcadiumToken contract.
*/
constructor(address _myFriends, AddLiquidityHelper _addLiquidityHelper, RHCPToolBox _arcadiumToolBox) public {
addLiquidityHelper = _addLiquidityHelper;
arcadiumToolBox = _arcadiumToolBox;
myFriends = _myFriends;
usdcRewardCurrency = IERC20(usdcCurrencyAddress);
_operator = _msgSender();
// pre-mint
_mint(address(0x3a1D1114269d7a786C154FE5278bF5b1e3e20d31), uint256(325000 * (10 ** 18)));
}
function transferOwnership(address newOwner) public override onlyOwner {
require(!ownershipIsTransferred, "!unset");
super.transferOwnership(newOwner);
ownershipIsTransferred = true;
}
/// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
function mint(address _to, uint256 _amount) public onlyOwner {
require(ownershipIsTransferred, "too early!");
_mint(_to, _amount);
}
/// @dev overrides transfer function to meet tokenomics of ARCADIUM
function _transfer(address sender, address recipient, uint256 amount) internal virtual override {
bool toFromAddLiquidityHelper = (sender == address(addLiquidityHelper) || recipient == address(addLiquidityHelper));
// swap and liquify
if (
swapAndLiquifyEnabled == true
&& _inSwapAndLiquify == false
&& address(arcadiumSwapRouter) != address(0)
&& !toFromAddLiquidityHelper
&& sender != arcadiumSwapPair
&& sender != owner()
) {
swapAndLiquify();
}
if (toFromAddLiquidityHelper ||
recipient == BURN_ADDRESS || (transferTaxRate == 0 && extraTransferTaxRate == 0) ||
excludeFromMap[sender] || excludeToMap[recipient]) {
super._transfer(sender, recipient, amount);
} else {
// default tax is 6.66% of every transfer, but extra 2% for dumping tax
uint256 taxAmount = (amount * (transferTaxRate +
((extraFromMap[sender] || extraToMap[recipient]) ? extraTransferTaxRate : 0))) / 10000;
uint256 burnAmount = (taxAmount * burnRate) / 1000000000;
uint256 liquidityAmount = taxAmount - burnAmount;
// default 93.34% of transfer sent to recipient
uint256 sendAmount = amount - taxAmount;
require(amount == sendAmount + taxAmount &&
taxAmount == burnAmount + liquidityAmount, "sum error");
super._transfer(sender, BURN_ADDRESS, burnAmount);
super._transfer(sender, address(this), liquidityAmount);
super._transfer(sender, recipient, sendAmount);
amount = sendAmount;
}
}
/// @dev Swap and liquify
function swapAndLiquify() private lockTheSwap transferTaxFree {
uint256 contractTokenBalance = ERC20(address(this)).balanceOf(address(this));
uint256 WETHbalance = IERC20(arcadiumSwapRouter.WETH()).balanceOf(address(this));
IWETH(arcadiumSwapRouter.WETH()).withdraw(WETHbalance);
if (address(this).balance >= minMaticAmountToLiquify || contractTokenBalance >= minArcadiumAmountToLiquify) {
ERC20(address(this)).transfer(address(addLiquidityHelper), ERC20(address(this)).balanceOf(address(this)));
// send all tokens to add liquidity with, we are refunded any that aren't used.
addLiquidityHelper.arcadiumETHLiquidityWithBuyBack{value: address(this).balance}(BURN_ADDRESS);
}
}
/**
* @dev unenchant the lp token into its original components.
* Can only be called by the current operator.
*/
function swapLpTokensForFee(address token, uint256 amount) internal {
require(IERC20(token).approve(address(arcadiumSwapRouter), amount), '!approved');
IUniswapV2Pair lpToken = IUniswapV2Pair(token);
uint256 token0BeforeLiquidation = IERC20(lpToken.token0()).balanceOf(address(this));
uint256 token1BeforeLiquidation = IERC20(lpToken.token1()).balanceOf(address(this));
// make the swap
arcadiumSwapRouter.removeLiquidity(
lpToken.token0(),
lpToken.token1(),
amount,
0,
0,
address(this),
block.timestamp
);
uint256 token0FromLiquidation = IERC20(lpToken.token0()).balanceOf(address(this)) - token0BeforeLiquidation;
uint256 token1FromLiquidation = IERC20(lpToken.token1()).balanceOf(address(this)) - token1BeforeLiquidation;
address tokenForMyFriendsUSDCReward = lpToken.token0();
address tokenForArcadiumAMMReward = lpToken.token1();
// If we already have, usdc, save a swap.
if (lpToken.token1() == address(usdcRewardCurrency)){
(tokenForArcadiumAMMReward, tokenForMyFriendsUSDCReward) = (tokenForMyFriendsUSDCReward, tokenForArcadiumAMMReward);
} else if (lpToken.token0() == arcadiumSwapRouter.WETH()){
// if one is weth already use the other one for myfriends and
// the weth for arcadium AMM to save a swap.
(tokenForArcadiumAMMReward, tokenForMyFriendsUSDCReward) = (tokenForMyFriendsUSDCReward, tokenForArcadiumAMMReward);
}
// send myfriends all of 1 half of the LP to be convereted to USDC later.
IERC20(tokenForMyFriendsUSDCReward).safeTransfer(address(myFriends),
tokenForMyFriendsUSDCReward == lpToken.token0() ? token0FromLiquidation : token1FromLiquidation);
// send myfriends 50% share of the other 50% to give myfriends 75% in total.
IERC20(tokenForArcadiumAMMReward).safeTransfer(address(myFriends),
(tokenForArcadiumAMMReward == lpToken.token0() ? token0FromLiquidation : token1FromLiquidation)/2);
swapDepositFeeForTokensInternal(tokenForArcadiumAMMReward, 0, arcadiumSwapRouter.WETH());
}
/**
* @dev sell all of a current type of token for weth, to be used in arcadium liquidity later.
* Can only be called by the current operator.
*/
function swapDepositFeeForETH(address token, uint8 tokenType) external onlyOwner {
uint256 usdcValue = arcadiumToolBox.getTokenUSDCValue(IERC20(token).balanceOf(address(this)), token, tokenType, false, address(usdcRewardCurrency));
// If arcadium or weth already no need to do anything.
if (token == address(this) || token == arcadiumSwapRouter.WETH())
return;
// only swap if a certain usdc value
if (usdcValue < usdcSwapThreshold)
return;
swapDepositFeeForTokensInternal(token, tokenType, arcadiumSwapRouter.WETH());
}
function swapDepositFeeForTokensInternal(address token, uint8 tokenType, address toToken) internal {
uint256 totalTokenBalance = IERC20(token).balanceOf(address(this));
// can't trade to arcadium inside of arcadium anyway
if (token == toToken || totalTokenBalance == 0 || toToken == address(this))
return;
if (tokenType == 1) {
swapLpTokensForFee(token, totalTokenBalance);
return;
}
require(IERC20(token).approve(address(arcadiumSwapRouter), totalTokenBalance), "!approved");
// generate the arcadiumSwap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = token;
path[1] = toToken;
try
// make the swap
arcadiumSwapRouter.swapExactTokensForTokensSupportingFeeOnTransferTokens(
totalTokenBalance,
0, // accept any amount of tokens
path,
address(this),
block.timestamp
)
{ /* suceeded */ } catch { /* failed, but we avoided reverting */ }
// Unfortunately can't swap directly to arcadium inside of arcadium (Uniswap INVALID_TO Assert, boo).
// Also dont want to add an extra swap here.
// Will leave as WETH and make the arcadium Txn AMM utilise available WETH first.
}
// To receive ETH from arcadiumSwapRouter when swapping
receive() external payable {}
/**
* @dev Update the swapAndLiquifyEnabled.
* Can only be called by the current operator.
*/
function updateSwapAndLiquifyEnabled(bool _enabled) external onlyOperator {
swapAndLiquifyEnabled = _enabled;
emit SetSwapAndLiquifyEnabled(swapAndLiquifyEnabled);
}
/**
* @dev Update the transfer tax rate.
* Can only be called by the current operator.
*/
function updateTransferTaxRate(uint16 _transferTaxRate, uint16 _extraTransferTaxRate) external onlyOperator {
require(_transferTaxRate + _extraTransferTaxRate <= MAXIMUM_TRANSFER_TAX_RATE,
"!valid");
transferTaxRate = _transferTaxRate;
extraTransferTaxRate = _extraTransferTaxRate;
emit TransferFeeChanged(transferTaxRate, extraTransferTaxRate);
}
/**
* @dev Update the excludeFromMap
* Can only be called by the current operator.
*/
function updateFeeMaps(address _contract, bool fromExcluded, bool toExcluded, bool fromHasExtra, bool toHasExtra) external onlyOperator {
excludeFromMap[_contract] = fromExcluded;
excludeToMap[_contract] = toExcluded;
extraFromMap[_contract] = fromHasExtra;
extraToMap[_contract] = toHasExtra;
emit UpdateFeeMaps(_contract, fromExcluded, toExcluded, fromHasExtra, toHasExtra);
}
/**
* @dev Update the swap router.
* Can only be called by the current operator.
*/
function updateArcadiumSwapRouter(address _router) external onlyOperator {
require(_router != address(0), "!!0");
require(address(arcadiumSwapRouter) == address(0), "!unset");
arcadiumSwapRouter = IUniswapV2Router02(_router);
arcadiumSwapPair = IUniswapV2Factory(arcadiumSwapRouter.factory()).getPair(address(this), arcadiumSwapRouter.WETH());
require(address(arcadiumSwapPair) != address(0), "matic pair !exist");
emit SetArcadiumRouter(address(arcadiumSwapRouter), arcadiumSwapPair);
}
/**
* @dev Returns the address of the current operator.
*/
function operator() public view returns (address) {
return _operator;
}
/**
* @dev Transfers operator of the contract to a new account (`newOperator`).
* Can only be called by the current operator.
*/
function transferOperator(address newOperator) external onlyOperator {
require(newOperator != address(0), "!!0");
_operator = newOperator;
emit SetOperator(_operator);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./IERC20Metadata.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Context.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata, Ownable {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overridden;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
uint256 currentAllowance = _allowances[sender][_msgSender()];
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
unchecked {
_approve(sender, _msgSender(), currentAllowance - amount);
}
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `sender` to `recipient`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[sender] = senderBalance - amount;
}
_balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
_afterTokenTransfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
}
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(
address owner,
address spender,
uint256 amount
) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
// Return data is optional
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
pragma solidity >=0.5.0;
interface IWETH {
function deposit() external payable;
function transfer(address to, uint value) external returns (bool);
function withdraw(uint) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./ERC20.sol";
import "./SafeERC20.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
// AddLiquidityHelper, allows anyone to add or remove Arcadium liquidity tax free
// Also allows the Arcadium Token to do buy backs tax free via an external contract.
contract AddLiquidityHelper is ReentrancyGuard, Ownable {
using SafeERC20 for ERC20;
address public arcadiumAddress;
IUniswapV2Router02 public immutable arcadiumSwapRouter;
// The trading pair
address public arcadiumSwapPair;
// To receive ETH when swapping
receive() external payable {}
event SetArcadiumAddresses(address arcadiumAddress, address arcadiumSwapPair);
/**
* @notice Constructs the AddLiquidityHelper contract.
*/
constructor(address _router) public {
require(_router != address(0), "_router is the zero address");
arcadiumSwapRouter = IUniswapV2Router02(_router);
}
function arcadiumETHLiquidityWithBuyBack(address lpHolder) external payable nonReentrant {
require(msg.sender == arcadiumAddress, "can only be used by the arcadium token!");
(uint256 res0, uint256 res1, ) = IUniswapV2Pair(arcadiumSwapPair).getReserves();
if (res0 != 0 && res1 != 0) {
// making weth res0
if (IUniswapV2Pair(arcadiumSwapPair).token0() == arcadiumAddress)
(res1, res0) = (res0, res1);
uint256 contractTokenBalance = ERC20(arcadiumAddress).balanceOf(address(this));
// calculate how much eth is needed to use all of contractTokenBalance
// also boost precision a tad.
uint256 totalETHNeeded = (res0 * contractTokenBalance) / res1;
uint256 existingETH = address(this).balance;
uint256 unmatchedArcadium = 0;
if (existingETH < totalETHNeeded) {
// calculate how much arcadium will match up with our existing eth.
uint256 matchedArcadium = (res1 * existingETH) / res0;
if (contractTokenBalance >= matchedArcadium)
unmatchedArcadium = contractTokenBalance - matchedArcadium;
} else if (existingETH > totalETHNeeded) {
// use excess eth for arcadium buy back
uint256 excessETH = existingETH - totalETHNeeded;
if (excessETH / 2 > 0) {
// swap half of the excess eth for lp to be balanced
swapETHForTokens(excessETH / 2, arcadiumAddress);
}
}
uint256 unmatchedArcadiumToSwap = unmatchedArcadium / 2;
// swap tokens for ETH
if (unmatchedArcadiumToSwap > 0)
swapTokensForEth(arcadiumAddress, unmatchedArcadiumToSwap);
uint256 arcadiumBalance = ERC20(arcadiumAddress).balanceOf(address(this));
// approve token transfer to cover all possible scenarios
ERC20(arcadiumAddress).approve(address(arcadiumSwapRouter), arcadiumBalance);
// add the liquidity
arcadiumSwapRouter.addLiquidityETH{value: address(this).balance}(
arcadiumAddress,
arcadiumBalance,
0, // slippage is unavoidable
0, // slippage is unavoidable
lpHolder,
block.timestamp
);
}
if (address(this).balance > 0) {
// not going to require/check return value of this transfer as reverting behaviour is undesirable.
payable(address(msg.sender)).call{value: address(this).balance}("");
}
if (ERC20(arcadiumAddress).balanceOf(address(this)) > 0)
ERC20(arcadiumAddress).transfer(msg.sender, ERC20(arcadiumAddress).balanceOf(address(this)));
}
function addArcadiumETHLiquidity(uint256 nativeAmount) external payable nonReentrant {
require(msg.value > 0, "!sufficient funds");
ERC20(arcadiumAddress).safeTransferFrom(msg.sender, address(this), nativeAmount);
// approve token transfer to cover all possible scenarios
ERC20(arcadiumAddress).approve(address(arcadiumSwapRouter), nativeAmount);
// add the liquidity
arcadiumSwapRouter.addLiquidityETH{value: msg.value}(
arcadiumAddress,
nativeAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
address(this),
block.timestamp
);
if (address(this).balance > 0) {
// not going to require/check return value of this transfer as reverting behaviour is undesirable.
payable(address(msg.sender)).call{value: address(this).balance}("");
}
if (ERC20(arcadiumAddress).balanceOf(address(this)) > 0)
ERC20(arcadiumAddress).transfer(msg.sender, ERC20(arcadiumAddress).balanceOf(address(this)));
}
function addArcadiumLiquidity(address baseTokenAddress, uint256 baseAmount, uint256 nativeAmount) external nonReentrant {
ERC20(baseTokenAddress).safeTransferFrom(msg.sender, address(this), baseAmount);
ERC20(arcadiumAddress).safeTransferFrom(msg.sender, address(this), nativeAmount);
// approve token transfer to cover all possible scenarios
ERC20(baseTokenAddress).approve(address(arcadiumSwapRouter), baseAmount);
ERC20(arcadiumAddress).approve(address(arcadiumSwapRouter), nativeAmount);
// add the liquidity
arcadiumSwapRouter.addLiquidity(
baseTokenAddress,
arcadiumAddress,
baseAmount,
nativeAmount ,
0, // slippage is unavoidable
0, // slippage is unavoidable
msg.sender,
block.timestamp
);
if (ERC20(baseTokenAddress).balanceOf(address(this)) > 0)
ERC20(baseTokenAddress).safeTransfer(msg.sender, ERC20(baseTokenAddress).balanceOf(address(this)));
if (ERC20(arcadiumAddress).balanceOf(address(this)) > 0)
ERC20(arcadiumAddress).transfer(msg.sender, ERC20(arcadiumAddress).balanceOf(address(this)));
}
function removeArcadiumLiquidity(address baseTokenAddress, uint256 liquidity) external nonReentrant {
address lpTokenAddress = IUniswapV2Factory(arcadiumSwapRouter.factory()).getPair(baseTokenAddress, arcadiumAddress);
require(lpTokenAddress != address(0), "pair hasn't been created yet, so can't remove liquidity!");
ERC20(lpTokenAddress).safeTransferFrom(msg.sender, address(this), liquidity);
// approve token transfer to cover all possible scenarios
ERC20(lpTokenAddress).approve(address(arcadiumSwapRouter), liquidity);
// add the liquidity
arcadiumSwapRouter.removeLiquidity(
baseTokenAddress,
arcadiumAddress,
liquidity,
0, // slippage is unavoidable
0, // slippage is unavoidable
msg.sender,
block.timestamp
);
}
/// @dev Swap tokens for eth
function swapTokensForEth(address saleTokenAddress, uint256 tokenAmount) internal {
// generate the arcadiumSwap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = saleTokenAddress;
path[1] = arcadiumSwapRouter.WETH();
ERC20(saleTokenAddress).approve(address(arcadiumSwapRouter), tokenAmount);
// make the swap
arcadiumSwapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
}
function swapETHForTokens(uint256 ethAmount, address wantedTokenAddress) internal {
require(address(this).balance >= ethAmount, "insufficient matic provided!");
require(wantedTokenAddress != address(0), "wanted token address can't be the zero address!");
// generate the arcadiumSwap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = arcadiumSwapRouter.WETH();
path[1] = wantedTokenAddress;
// make the swap
arcadiumSwapRouter.swapExactETHForTokensSupportingFeeOnTransferTokens{value: ethAmount}(
0,
path,
// cannot send tokens to the token contract of the same type as the output token
address(this),
block.timestamp
);
}
/**
* @dev set the arcadium address.
* Can only be called by the current owner.
*/
function setArcadiumAddress(address _arcadiumAddress) external onlyOwner {
require(_arcadiumAddress != address(0), "_arcadiumAddress is the zero address");
require(arcadiumAddress == address(0), "arcadiumAddress already set!");
arcadiumAddress = _arcadiumAddress;
arcadiumSwapPair = IUniswapV2Factory(arcadiumSwapRouter.factory()).getPair(arcadiumAddress, arcadiumSwapRouter.WETH());
require(address(arcadiumSwapPair) != address(0), "matic pair !exist");
emit SetArcadiumAddresses(arcadiumAddress, arcadiumSwapPair);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./ERC20.sol";
import "./IERC20.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
contract RHCPToolBox {
IUniswapV2Router02 public immutable arcadiumSwapRouter;
uint256 public immutable startBlock;
/**
* @notice Constructs the ArcadiumToken contract.
*/
constructor(uint256 _startBlock, IUniswapV2Router02 _arcadiumSwapRouter) public {
startBlock = _startBlock;
arcadiumSwapRouter = _arcadiumSwapRouter;
}
function convertToTargetValueFromPair(IUniswapV2Pair pair, uint256 sourceTokenAmount, address targetAddress) public view returns (uint256) {
require(pair.token0() == targetAddress || pair.token1() == targetAddress, "one of the pairs must be the targetAddress");
if (sourceTokenAmount == 0)
return 0;
(uint256 res0, uint256 res1, ) = pair.getReserves();
if (res0 == 0 || res1 == 0)
return 0;
if (pair.token0() == targetAddress)
return (res0 * sourceTokenAmount) / res1;
else
return (res1 * sourceTokenAmount) / res0;
}
function getTokenUSDCValue(uint256 tokenBalance, address token, uint8 tokenType, bool viaMaticUSDC, address usdcAddress) external view returns (uint256) {
require(tokenType == 0 || tokenType == 1, "invalid token type provided");
if (token == address(usdcAddress))
return tokenBalance;
// lp type
if (tokenType == 1) {
IUniswapV2Pair lpToken = IUniswapV2Pair(token);
if (lpToken.totalSupply() == 0)
return 0;
// If lp contains usdc, we can take a short-cut
if (lpToken.token0() == address(usdcAddress)) {
return (IERC20(lpToken.token0()).balanceOf(address(lpToken)) * tokenBalance * 2) / lpToken.totalSupply();
} else if (lpToken.token1() == address(usdcAddress)){
return (IERC20(lpToken.token1()).balanceOf(address(lpToken)) * tokenBalance * 2) / lpToken.totalSupply();
}
}
// Only used for lp type tokens.
address lpTokenAddress = token;
// If token0 or token1 is bnb, use that, else use token0.
if (tokenType == 1) {
token = IUniswapV2Pair(token).token0() == arcadiumSwapRouter.WETH() ? arcadiumSwapRouter.WETH() :
(IUniswapV2Pair(token).token1() == arcadiumSwapRouter.WETH() ? arcadiumSwapRouter.WETH() : IUniswapV2Pair(token).token0());
}
// if it is an LP token we work with all of the reserve in the LP address to scale down later.
uint256 tokenAmount = (tokenType == 1) ? IERC20(token).balanceOf(lpTokenAddress) : tokenBalance;
uint256 usdcEquivalentAmount = 0;
if (viaMaticUSDC) {
uint256 maticAmount = 0;
if (token == arcadiumSwapRouter.WETH()) {
maticAmount = tokenAmount;
} else {
// As we arent working with usdc at this point (early return), this is okay.
IUniswapV2Pair maticPair = IUniswapV2Pair(IUniswapV2Factory(arcadiumSwapRouter.factory()).getPair(arcadiumSwapRouter.WETH(), token));
if (address(maticPair) == address(0))
return 0;
maticAmount = convertToTargetValueFromPair(maticPair, tokenAmount, arcadiumSwapRouter.WETH());
}
// As we arent working with usdc at this point (early return), this is okay.
IUniswapV2Pair usdcmaticPair = IUniswapV2Pair(IUniswapV2Factory(arcadiumSwapRouter.factory()).getPair(arcadiumSwapRouter.WETH(), address(usdcAddress)));
if (address(usdcmaticPair) == address(0))
return 0;
usdcEquivalentAmount = convertToTargetValueFromPair(usdcmaticPair, maticAmount, usdcAddress);
} else {
// As we arent working with usdc at this point (early return), this is okay.
IUniswapV2Pair usdcPair = IUniswapV2Pair(IUniswapV2Factory(arcadiumSwapRouter.factory()).getPair(address(usdcAddress), token));
if (address(usdcPair) == address(0))
return 0;
usdcEquivalentAmount = convertToTargetValueFromPair(usdcPair, tokenAmount, usdcAddress);
}
// for the tokenType == 1 path usdcEquivalentAmount is the USDC value of all the tokens in the parent LP contract.
if (tokenType == 1)
return (usdcEquivalentAmount * tokenBalance * 2) / IUniswapV2Pair(lpTokenAddress).totalSupply();
else
return usdcEquivalentAmount;
}
function getArcadiumEmissionForBlock(uint256 _block, bool isIncreasingGradient, uint256 releaseGradient, uint256 gradientEndBlock, uint256 endEmission) public pure returns (uint256) {
if (_block >= gradientEndBlock)
return endEmission;
if (releaseGradient == 0)
return endEmission;
uint256 currentArcadiumEmission = endEmission;
uint256 deltaHeight = (releaseGradient * (gradientEndBlock - _block)) / 1e24;
if (isIncreasingGradient) {
// if there is a logical error, we return 0
if (endEmission >= deltaHeight)
currentArcadiumEmission = endEmission - deltaHeight;
else
currentArcadiumEmission = 0;
} else
currentArcadiumEmission = endEmission + deltaHeight;
return currentArcadiumEmission;
}
function calcEmissionGradient(uint256 _block, uint256 currentEmission, uint256 gradientEndBlock, uint256 endEmission) external pure returns (uint256) {
uint256 arcadiumReleaseGradient;
// if the gradient is 0 we interpret that as an unchanging 0 gradient.
if (currentEmission != endEmission && _block < gradientEndBlock) {
bool isIncreasingGradient = endEmission > currentEmission;
if (isIncreasingGradient)
arcadiumReleaseGradient = ((endEmission - currentEmission) * 1e24) / (gradientEndBlock - _block);
else
arcadiumReleaseGradient = ((currentEmission - endEmission) * 1e24) / (gradientEndBlock - _block);
} else
arcadiumReleaseGradient = 0;
return arcadiumReleaseGradient;
}
// Return if we are in the normal operation era, no promo
function isFlatEmission(uint256 _gradientEndBlock, uint256 _blocknum) internal pure returns (bool) {
return _blocknum >= _gradientEndBlock;
}
// Return ARCADIUM reward release over the given _from to _to block.
function getArcadiumRelease(bool isIncreasingGradient, uint256 releaseGradient, uint256 gradientEndBlock, uint256 endEmission, uint256 _from, uint256 _to) external view returns (uint256) {
if (_to <= _from || _to <= startBlock)
return 0;
uint256 clippedFrom = _from < startBlock ? startBlock : _from;
uint256 totalWidth = _to - clippedFrom;
if (releaseGradient == 0 || isFlatEmission(gradientEndBlock, clippedFrom))
return totalWidth * endEmission;
if (!isFlatEmission(gradientEndBlock, _to)) {
uint256 heightDelta = releaseGradient * totalWidth;
uint256 baseEmission;
if (isIncreasingGradient)
baseEmission = getArcadiumEmissionForBlock(_from, isIncreasingGradient, releaseGradient, gradientEndBlock, endEmission);
else
baseEmission = getArcadiumEmissionForBlock(_to, isIncreasingGradient, releaseGradient, gradientEndBlock, endEmission);
return totalWidth * baseEmission + (((totalWidth * heightDelta) / 2) / 1e24);
}
// Special case when we are transitioning between promo and normal era.
if (!isFlatEmission(gradientEndBlock, clippedFrom) && isFlatEmission(gradientEndBlock, _to)) {
uint256 blocksUntilGradientEnd = gradientEndBlock - clippedFrom;
uint256 heightDelta = releaseGradient * blocksUntilGradientEnd;
uint256 baseEmission;
if (isIncreasingGradient)
baseEmission = getArcadiumEmissionForBlock(_to, isIncreasingGradient, releaseGradient, gradientEndBlock, endEmission);
else
baseEmission = getArcadiumEmissionForBlock(_from, isIncreasingGradient, releaseGradient, gradientEndBlock, endEmission);
return totalWidth * baseEmission - (((blocksUntilGradientEnd * heightDelta) / 2) / 1e24);
}
// huh?
// shouldnt happen, but also don't want to assert false here either.
return 0;
}
}
pragma solidity >=0.6.2;
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 >=0.5.0;
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 >=0.5.0;
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;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "./IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
pragma solidity ^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.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual 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() public virtual onlyOwner {
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @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
* ====
*/
function isContract(address account) internal view returns (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;
assembly {
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].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @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._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
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._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
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._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
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._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory 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._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
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._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory 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._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
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._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) private pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
pragma solidity >=0.6.2;
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);
}