Contract Name:
IslandToken
Contract Source Code:
File 1 of 1 : IslandToken
pragma solidity 0.8.0;
// SPDX-License-Identifier: Unlicensed
/*
* @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) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @dev 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 () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), 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 {
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) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
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);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
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);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @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 a - b;
}
/**
* @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) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* 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) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
/**
* @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;
// solhint-disable-next-line no-inline-assembly
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");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(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
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
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;
}
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;
}
contract IslandToken is Context, Ownable, IERC20 {
// Libraries
using SafeMath for uint256;
using Address for address;
// Attributes for ERC-20 token
string private _name = "Island";
string private _symbol = "ISLE";
uint8 private _decimals = 9;
mapping (address => uint256) private _balance;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _total = 690000000 * 10**6 * 10**9;
uint256 private maxTxAmount = 3450000 * 10**6 * 10**9;
uint256 private numTokensSellToAddToLiquidity = 345000 * 10**6 * 10**9;
uint256 private minHoldingThreshold = 100 * 10**6 * 10**9;
// Island attributes
uint8 public sandTax = 5;
uint8 public burnableFundRate = 5;
uint8 public operationalFundRate = 1;
uint256 public sandFund;
uint256 public burnableFund;
uint256 public operationalFund;
uint256 private largePrizeTotal = 0;
uint256 private mediumPrizeTotal = 0;
uint256 private smallPrizeTotal = 0;
bool inSwapAndLiquify;
bool public swapAndLiquifyEnabled = true;
IUniswapV2Router02 public immutable uniSwapV2Router;
address public immutable uniswapV2Pair;
struct Entity {
address _key;
bool _isValid;
uint256 _createdAt;
}
mapping (address => uint256) private addressToIndex;
mapping (uint256 => Entity) private indexToEntity;
uint256 private lastIndexUsed = 0;
uint256 private lastEntryAllowed = 0;
uint32 public perBatchSize = 100;
event GrandPrizeReceivedAddresses (
address addressReceived,
uint256 amount
);
event MediumPrizeReceivedAddresses (
address[] addressesReceived,
uint256 amount
);
event SmallPrizePayoutComplete (
uint256 amount
);
event SwapAndLiquifyEnabledUpdated(bool enabled);
event SwapAndLiquify(
uint256 tokensSwapped,
uint256 ethReceived,
uint256 tokensIntoLiqudity
);
event OperationalFundWithdrawn(
uint256 amount,
address recepient,
string reason
);
event StartSand (
uint256 largePrizeTotal,
uint256 mediumPrizeTotal,
uint256 lowPrizeTotal
);
constructor () {
_balance[_msgSender()] = _total;
addEntity(_msgSender());
sandFund = 0;
burnableFund = 0;
operationalFund = 0;
inSwapAndLiquify = false;
IUniswapV2Router02 _UniSwapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
uniswapV2Pair = IUniswapV2Factory(_UniSwapV2Router.factory())
.createPair(address(this), _UniSwapV2Router.WETH());
uniSwapV2Router = _UniSwapV2Router;
emit Transfer(address(0), _msgSender(), _total);
}
modifier lockTheSwap {
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
}
// --- section 1 --- : Standard ERC 20 functions
function name() public view returns (string memory) {
return _name;
}
function symbol() public view returns (string memory) {
return _symbol;
}
function decimals() public view returns (uint8) {
return _decimals;
}
function totalSupply() public view override returns (uint256) {
return _total;
}
function balanceOf(address account) public view override returns (uint256) {
return _balance[account];
}
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
// --- section 2 --- : Island specific logics
function burnToken(uint256 amount) public onlyOwner virtual {
require(amount <= _balance[address(this)], "Cannot burn more than avilable balancec");
require(amount <= burnableFund, "Cannot burn more than burn fund");
_balance[address(this)] = _balance[address(this)].sub(amount);
_total = _total.sub(amount);
burnableFund = burnableFund.sub(amount);
emit Transfer(address(this), address(0), amount);
}
function getCommunityIslandFund() public view returns (uint256) {
uint256 communityFund = burnableFund.add(sandFund).add(operationalFund);
return communityFund;
}
function getminHoldingThreshold() public view returns (uint256) {
return minHoldingThreshold;
}
function getMaxTxnAmount() public view returns (uint256) {
return maxTxAmount;
}
function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {
swapAndLiquifyEnabled = _enabled;
emit SwapAndLiquifyEnabledUpdated(_enabled);
}
function setminHoldingThreshold(uint256 amount) public onlyOwner {
minHoldingThreshold = amount;
}
function setMaxTxnAmount(uint256 amount) public onlyOwner {
maxTxAmount = amount;
}
function setBatchSize(uint32 newSize) public onlyOwner {
perBatchSize = newSize;
}
function withdrawOperationFund(uint256 amount, address walletAddress, string memory reason) public onlyOwner() {
require(amount < operationalFund, "You cannot withdraw more funds that you have in island fund");
require(amount <= _balance[address(this)], "You cannot withdraw more funds that you have in operation fund");
// track operation fund after withdrawal
operationalFund = operationalFund.sub(amount);
_balance[address(this)] = _balance[address(this)].sub(amount);
_balance[walletAddress] = _balance[walletAddress].add(amount);
emit OperationalFundWithdrawn(amount, walletAddress, reason);
}
function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {
uint256 half = contractTokenBalance.div(2);
uint256 otherHalf = contractTokenBalance.sub(half);
uint256 initialBalance = address(this).balance;
swapTokensForEth(half);
uint256 newBalance = address(this).balance.sub(initialBalance);
addLiquidity(otherHalf, newBalance);
emit SwapAndLiquify(half, newBalance, otherHalf);
}
function swapTokensForEth(uint256 tokenAmount) private {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniSwapV2Router.WETH();
_approve(address(this), address(uniSwapV2Router), tokenAmount);
// make the swap
uniSwapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
}
//to recieve WETH from Uniswap when swaping
receive() external payable {}
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(uniSwapV2Router), tokenAmount);
// add the liquidity
uniSwapV2Router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
owner(),
block.timestamp
);
}
// --- section 3 --- : Executions
function _approve(address owner, address spender, uint256 amount) private {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _transfer(address fromAddress, address toAddress, uint256 amount) private {
require(fromAddress != address(0) && toAddress != address(0), "ERC20: transfer from/to the zero address");
require(amount > 0 && amount <= _balance[fromAddress], "Transfer amount invalid");
if(fromAddress != owner() && toAddress != owner())
require(amount <= maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
// This is contract's balance without any reserved funds such as island Fund
uint256 contractTokenBalance = balanceOf(address(this)).sub(getCommunityIslandFund());
bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;
// Dynamically hydrate LP. Standard practice in recent altcoin
if (
overMinTokenBalance &&
!inSwapAndLiquify &&
fromAddress != uniswapV2Pair &&
swapAndLiquifyEnabled
) {
contractTokenBalance = numTokensSellToAddToLiquidity;
swapAndLiquify(contractTokenBalance);
}
_balance[fromAddress] = _balance[fromAddress].sub(amount);
uint256 transactionTokenAmount = _getValues(amount);
_balance[toAddress] = _balance[toAddress].add(transactionTokenAmount);
// Add and remove wallet address from SAND eligibility
if (_balance[toAddress] >= minHoldingThreshold && toAddress != address(this)){
addEntity(toAddress);
}
if (_balance[fromAddress] < minHoldingThreshold && fromAddress != address(this)) {
removeEntity(fromAddress);
}
shuffleEntities(amount, transactionTokenAmount);
emit Transfer(fromAddress, toAddress, transactionTokenAmount);
}
function _getValues(uint256 amount) private returns (uint256) {
uint256 sandTaxFee = _extractSandFund(amount);
uint256 operationalTax = _extractOperationalFund(amount);
uint256 burnableFundTax = _extractBurnableFund(amount);
uint256 businessTax = operationalTax.add(burnableFundTax).add(sandTaxFee);
uint256 transactionAmount = amount.sub(businessTax);
return transactionAmount;
}
function _extractSandFund(uint256 amount) private returns (uint256) {
uint256 sandFundContribution = _getExtractableFund(amount, sandTax);
sandFund = sandFund.add(sandFundContribution);
_balance[address(this)] = _balance[address(this)].add(sandFundContribution);
return sandFundContribution;
}
function _extractOperationalFund(uint256 amount) private returns (uint256) {
(uint256 operationalFundContribution) = _getExtractableFund(amount, operationalFundRate);
operationalFund = operationalFund.add(operationalFundContribution);
_balance[address(this)] = _balance[address(this)].add(operationalFundContribution);
return operationalFundContribution;
}
function _extractBurnableFund(uint256 amount) private returns (uint256) {
(uint256 burnableFundContribution) = _getExtractableFund(amount, burnableFundRate);
burnableFund = burnableFund.add(burnableFundContribution);
_balance[address(this)] = _balance[address(this)].add(burnableFundContribution);
return burnableFundContribution;
}
function _getExtractableFund(uint256 amount, uint8 rate) private pure returns (uint256) {
return amount.mul(rate).div(10**2);
}
// --- Section 4 --- : SAND functions.
// Off-chain bot calls payoutLargeRedistribution, payoutMediumRedistribution, payoutSmallRedistribution in order
function startSand() public onlyOwner returns (bool success) {
require (sandFund > 0, "fund too small");
largePrizeTotal = sandFund.div(4);
mediumPrizeTotal = sandFund.div(2);
smallPrizeTotal = sandFund.sub(largePrizeTotal).sub(mediumPrizeTotal);
lastEntryAllowed = lastIndexUsed;
emit StartSand(largePrizeTotal, mediumPrizeTotal, smallPrizeTotal);
return true;
}
function payoutLargeRedistribution() public onlyOwner() returns (bool success) {
require (lastEntryAllowed != 0, "SAND must be initiated before this function can be called.");
uint256 seed = 69;
uint256 largePrize = largePrizeTotal;
// Uses random number generator from timestamp. However, nobody should know what order addresses are stored due to shffle
uint randNum = uint(keccak256(abi.encodePacked(block.timestamp, msg.sender, seed))) % lastEntryAllowed;
Entity memory bigPrizeEligibleEntity = getEntity(randNum, false);
while (bigPrizeEligibleEntity._isValid != true) {
// Uses random number generator from timestamp. However, nobody should know what order addresses are stored due to shffle
randNum = uint(keccak256(abi.encodePacked(block.timestamp, msg.sender, seed))) % lastEntryAllowed;
bigPrizeEligibleEntity = getEntity(randNum, false);
}
address bigPrizeEligibleAddress = bigPrizeEligibleEntity._key;
sandFund = sandFund.sub(largePrize);
_balance[bigPrizeEligibleAddress] = _balance[bigPrizeEligibleAddress].add(largePrize);
_balance[address(this)] = _balance[address(this)].sub(largePrize);
largePrizeTotal = 0;
emit GrandPrizeReceivedAddresses(bigPrizeEligibleAddress, largePrize);
return true;
}
function payoutMediumRedistribution() public onlyOwner() returns (bool success) {
require (lastEntryAllowed != 0, "SAND must be initiated before this function can be called.");
// Should be executed after grand prize is received
uint256 mediumPrize = mediumPrizeTotal;
uint256 eligibleHolderCount = 100;
uint256 totalDisbursed = 0;
uint256 seed = 69;
address[] memory eligibleAddresses = new address[](100);
uint8 counter = 0;
// Not likely scenarios where there are less than 100 eligible accounts
if (lastEntryAllowed <= 100) {
// If eligible acccount counts are less than 100, evenly split
eligibleHolderCount = lastEntryAllowed;
mediumPrize = mediumPrize.div(eligibleHolderCount);
while (counter < eligibleHolderCount) {
if (indexToEntity[counter + 1]._isValid) {
eligibleAddresses[counter] = indexToEntity[counter + 1]._key;
totalDisbursed = totalDisbursed.add(mediumPrize);
_balance[indexToEntity[counter + 1]._key] = _balance[indexToEntity[counter + 1]._key].add(mediumPrize);
counter++;
}
seed = seed.add(1);
}
sandFund = sandFund.sub(totalDisbursed);
_balance[address(this)] = _balance[address(this)].sub(totalDisbursed);
// This may be different from totalDisbursed depending on number of eligible accounts.
// The primary use of this attribute is more of a flag to indicate the medium prize is disbursed fully.
mediumPrizeTotal = 0;
emit MediumPrizeReceivedAddresses(eligibleAddresses, mediumPrize);
return true;
}
mediumPrize = mediumPrize.div(eligibleHolderCount);
// Max iteration should never be comparably larger than 100 due to how the addresses and indexes are used.
while (counter < eligibleHolderCount) {
// Uses random number generator from timestamp. However, nobody should know what order addresses are stored due to shffle
uint randNum = uint(keccak256(abi.encodePacked(block.timestamp, msg.sender, seed))) % lastEntryAllowed;
if (indexToEntity[randNum]._isValid) {
eligibleAddresses[counter] = indexToEntity[randNum]._key;
totalDisbursed = totalDisbursed.add(mediumPrize);
_balance[indexToEntity[randNum]._key] = _balance[indexToEntity[randNum]._key].add(mediumPrize);
counter++;
}
seed = seed.add(1);
}
sandFund = sandFund.sub(totalDisbursed);
_balance[address(this)] = _balance[address(this)].sub(totalDisbursed);
// This may be different from totalDisbursed depending on number of eligible accounts.
// The primary use of this attribute is more of a flag to indicate the medium prize is disbursed fully.
mediumPrizeTotal = 0;
emit MediumPrizeReceivedAddresses(eligibleAddresses, mediumPrize);
return true;
}
function payoutSmallRedistribution(uint256 startIndex) public onlyOwner() returns (bool success) {
require (lastEntryAllowed != 0 && startIndex > 0, "Medium prize must be disbursed before this one");
uint256 rewardAmount = smallPrizeTotal.div(lastEntryAllowed);
uint256 totalDisbursed = 0;
for (uint256 i = startIndex; i < startIndex + perBatchSize; i++) {
if (sandFund < rewardAmount) {
break;
}
// Timestamp being used to prevent duplicate rewards
if (indexToEntity[i]._isValid == true) {
_balance[indexToEntity[i]._key] = _balance[indexToEntity[i]._key].add(rewardAmount);
totalDisbursed = totalDisbursed.add(rewardAmount);
}
if (i == lastEntryAllowed) {
emit SmallPrizePayoutComplete(rewardAmount);
smallPrizeTotal = 0;
break;
}
}
sandFund = sandFund.sub(totalDisbursed);
_balance[address(this)] = _balance[address(this)].sub(totalDisbursed);
return true;
}
function EndSand() public onlyOwner returns (bool success) {
// Checking this equates to ALL redistribution events are completed.
require (lastEntryAllowed != 0, "All prizes must be disbursed before being able to close SAND");
smallPrizeTotal = 0;
mediumPrizeTotal = 0;
largePrizeTotal = 0;
lastEntryAllowed = 0;
return true;
}
// --- Section 5 ---
function addEntity (address walletAddress) private {
if (addressToIndex[walletAddress] != 0) {
return;
}
uint256 index = lastIndexUsed.add(1);
indexToEntity[index] = Entity({
_key: walletAddress,
_isValid: true,
_createdAt: block.timestamp
});
addressToIndex[walletAddress] = index;
lastIndexUsed = index;
}
function removeEntity (address walletAddress) private {
if (addressToIndex[walletAddress] == 0) {
return;
}
uint256 index = addressToIndex[walletAddress];
addressToIndex[walletAddress] = 0;
if (index != lastIndexUsed) {
indexToEntity[index] = indexToEntity[lastIndexUsed];
addressToIndex[indexToEntity[lastIndexUsed]._key] = index;
}
indexToEntity[lastIndexUsed]._isValid = false;
lastIndexUsed = lastIndexUsed.sub(1);
}
function shuffleEntities(uint256 intA, uint256 intB) private {
// Interval of 1 to lastIndexUsed - 1
intA = intA.mod(lastIndexUsed - 1) + 1;
intB = intB.mod(lastIndexUsed - 1) + 1;
Entity memory entityA = indexToEntity[intA];
Entity memory entityB = indexToEntity[intB];
if (entityA._isValid && entityB._isValid) {
addressToIndex[entityA._key] = intB;
addressToIndex[entityB._key] = intA;
indexToEntity[intA] = entityB;
indexToEntity[intB] = entityA;
}
}
function getEntityListLength () public view returns (uint256) {
return lastIndexUsed;
}
function getEntity (uint256 index, bool shouldReject) private view returns (Entity memory) {
if (shouldReject == true) {
require(index <= getEntityListLength(), "Index out of range");
}
return indexToEntity[index];
}
function getEntityTimeStamp (address walletAddress) public view returns (uint256) {
require (addressToIndex[walletAddress] != 0, "Empty!");
return indexToEntity[addressToIndex[walletAddress]]._createdAt;
}
}