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// SPDX-License-Identifier: NONE | |
pragma solidity ^0.8.0; | |
abstract contract Context { | |
function _msgSender() internal view virtual returns (address) { | |
return msg.sender; | |
} | |
function _msgData() internal view virtual returns (bytes calldata) { | |
return msg.data; | |
} | |
} | |
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 { | |
_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); | |
} | |
} | |
library SafeCast { | |
/** | |
* @dev Returns the downcasted uint224 from uint256, reverting on | |
* overflow (when the input is greater than largest uint224). | |
* | |
* Counterpart to Solidity's `uint224` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 224 bits | |
*/ | |
function toUint224(uint256 value) internal pure returns (uint224) { | |
require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); | |
return uint224(value); | |
} | |
/** | |
* @dev Returns the downcasted uint128 from uint256, reverting on | |
* overflow (when the input is greater than largest uint128). | |
* | |
* Counterpart to Solidity's `uint128` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 128 bits | |
*/ | |
function toUint128(uint256 value) internal pure returns (uint128) { | |
require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits"); | |
return uint128(value); | |
} | |
/** | |
* @dev Returns the downcasted uint96 from uint256, reverting on | |
* overflow (when the input is greater than largest uint96). | |
* | |
* Counterpart to Solidity's `uint96` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 96 bits | |
*/ | |
function toUint96(uint256 value) internal pure returns (uint96) { | |
require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits"); | |
return uint96(value); | |
} | |
/** | |
* @dev Returns the downcasted uint64 from uint256, reverting on | |
* overflow (when the input is greater than largest uint64). | |
* | |
* Counterpart to Solidity's `uint64` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 64 bits | |
*/ | |
function toUint64(uint256 value) internal pure returns (uint64) { | |
require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits"); | |
return uint64(value); | |
} | |
/** | |
* @dev Returns the downcasted uint32 from uint256, reverting on | |
* overflow (when the input is greater than largest uint32). | |
* | |
* Counterpart to Solidity's `uint32` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 32 bits | |
*/ | |
function toUint32(uint256 value) internal pure returns (uint32) { | |
require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits"); | |
return uint32(value); | |
} | |
/** | |
* @dev Returns the downcasted uint16 from uint256, reverting on | |
* overflow (when the input is greater than largest uint16). | |
* | |
* Counterpart to Solidity's `uint16` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 16 bits | |
*/ | |
function toUint16(uint256 value) internal pure returns (uint16) { | |
require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits"); | |
return uint16(value); | |
} | |
/** | |
* @dev Returns the downcasted uint8 from uint256, reverting on | |
* overflow (when the input is greater than largest uint8). | |
* | |
* Counterpart to Solidity's `uint8` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 8 bits. | |
*/ | |
function toUint8(uint256 value) internal pure returns (uint8) { | |
require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits"); | |
return uint8(value); | |
} | |
/** | |
* @dev Converts a signed int256 into an unsigned uint256. | |
* | |
* Requirements: | |
* | |
* - input must be greater than or equal to 0. | |
*/ | |
function toUint256(int256 value) internal pure returns (uint256) { | |
require(value >= 0, "SafeCast: value must be positive"); | |
return uint256(value); | |
} | |
/** | |
* @dev Returns the downcasted int128 from int256, reverting on | |
* overflow (when the input is less than smallest int128 or | |
* greater than largest int128). | |
* | |
* Counterpart to Solidity's `int128` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 128 bits | |
* | |
* _Available since v3.1._ | |
*/ | |
function toInt128(int256 value) internal pure returns (int128) { | |
require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits"); | |
return int128(value); | |
} | |
/** | |
* @dev Returns the downcasted int64 from int256, reverting on | |
* overflow (when the input is less than smallest int64 or | |
* greater than largest int64). | |
* | |
* Counterpart to Solidity's `int64` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 64 bits | |
* | |
* _Available since v3.1._ | |
*/ | |
function toInt64(int256 value) internal pure returns (int64) { | |
require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits"); | |
return int64(value); | |
} | |
/** | |
* @dev Returns the downcasted int32 from int256, reverting on | |
* overflow (when the input is less than smallest int32 or | |
* greater than largest int32). | |
* | |
* Counterpart to Solidity's `int32` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 32 bits | |
* | |
* _Available since v3.1._ | |
*/ | |
function toInt32(int256 value) internal pure returns (int32) { | |
require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits"); | |
return int32(value); | |
} | |
/** | |
* @dev Returns the downcasted int16 from int256, reverting on | |
* overflow (when the input is less than smallest int16 or | |
* greater than largest int16). | |
* | |
* Counterpart to Solidity's `int16` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 16 bits | |
* | |
* _Available since v3.1._ | |
*/ | |
function toInt16(int256 value) internal pure returns (int16) { | |
require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits"); | |
return int16(value); | |
} | |
/** | |
* @dev Returns the downcasted int8 from int256, reverting on | |
* overflow (when the input is less than smallest int8 or | |
* greater than largest int8). | |
* | |
* Counterpart to Solidity's `int8` operator. | |
* | |
* Requirements: | |
* | |
* - input must fit into 8 bits. | |
* | |
* _Available since v3.1._ | |
*/ | |
function toInt8(int256 value) internal pure returns (int8) { | |
require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits"); | |
return int8(value); | |
} | |
/** | |
* @dev Converts an unsigned uint256 into a signed int256. | |
* | |
* Requirements: | |
* | |
* - input must be less than or equal to maxInt256. | |
*/ | |
function toInt256(uint256 value) internal pure returns (int256) { | |
// Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive | |
require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256"); | |
return int256(value); | |
} | |
} | |
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. 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; | |
} | |
} | |
} | |
library SignedSafeMath { | |
/** | |
* @dev Returns the multiplication of two signed integers, reverting on | |
* overflow. | |
* | |
* Counterpart to Solidity's `*` operator. | |
* | |
* Requirements: | |
* | |
* - Multiplication cannot overflow. | |
*/ | |
function mul(int256 a, int256 b) internal pure returns (int256) { | |
return a * b; | |
} | |
/** | |
* @dev Returns the integer division of two signed integers. Reverts on | |
* division by zero. The result is rounded towards zero. | |
* | |
* Counterpart to Solidity's `/` operator. | |
* | |
* Requirements: | |
* | |
* - The divisor cannot be zero. | |
*/ | |
function div(int256 a, int256 b) internal pure returns (int256) { | |
return a / b; | |
} | |
/** | |
* @dev Returns the subtraction of two signed integers, reverting on | |
* overflow. | |
* | |
* Counterpart to Solidity's `-` operator. | |
* | |
* Requirements: | |
* | |
* - Subtraction cannot overflow. | |
*/ | |
function sub(int256 a, int256 b) internal pure returns (int256) { | |
return a - b; | |
} | |
/** | |
* @dev Returns the addition of two signed integers, reverting on | |
* overflow. | |
* | |
* Counterpart to Solidity's `+` operator. | |
* | |
* Requirements: | |
* | |
* - Addition cannot overflow. | |
*/ | |
function add(int256 a, int256 b) internal pure returns (int256) { | |
return a + b; | |
} | |
} | |
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); | |
} | |
interface IERC20Metadata is IERC20 { | |
/** | |
* @dev Returns the name of the token. | |
*/ | |
function name() external view returns (string memory); | |
//function name() external pure returns (string memory); | |
/** | |
* @dev Returns the symbol of the token. | |
*/ | |
function symbol() external view returns (string memory); | |
//function symbol() external pure returns (string memory); | |
/** | |
* @dev Returns the decimals places of the token. | |
*/ | |
function decimals() external view returns (uint8); | |
//function decimals() external pure returns (uint8); | |
} | |
contract ERC20 is Context, IERC20, IERC20Metadata { | |
mapping(address => uint256) private _balances; | |
mapping(address => mapping(address => uint256)) private _allowances; | |
uint256 private _totalSupply; | |
string private _name; | |
string private _symbol; | |
uint8 private _decimals; | |
/** | |
* @dev Sets the values for {name} and {symbol}. | |
* | |
* The default value of {decimals} is 9. 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_; | |
_decimals = 9; | |
} | |
/** | |
* @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 9, 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 _decimals; | |
} | |
/** | |
* @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 {} | |
} | |
library IterableMapping { | |
// Iterable mapping from address to uint; | |
struct Map { | |
address[] keys; | |
mapping(address => uint) values; | |
mapping(address => uint) indexOf; | |
mapping(address => bool) inserted; | |
} | |
function get(Map storage map, address key) public view returns (uint) { | |
return map.values[key]; | |
} | |
function getIndexOfKey(Map storage map, address key) public view returns (int) { | |
if(!map.inserted[key]) { | |
return -1; | |
} | |
return int(map.indexOf[key]); | |
} | |
function getKeyAtIndex(Map storage map, uint index) public view returns (address) { | |
return map.keys[index]; | |
} | |
function size(Map storage map) public view returns (uint) { | |
return map.keys.length; | |
} | |
function set(Map storage map, address key, uint val) public { | |
if (map.inserted[key]) { | |
map.values[key] = val; | |
} else { | |
map.inserted[key] = true; | |
map.values[key] = val; | |
map.indexOf[key] = map.keys.length; | |
map.keys.push(key); | |
} | |
} | |
function remove(Map storage map, address key) public { | |
if (!map.inserted[key]) { | |
return; | |
} | |
delete map.inserted[key]; | |
delete map.values[key]; | |
uint index = map.indexOf[key]; | |
uint lastIndex = map.keys.length - 1; | |
address lastKey = map.keys[lastIndex]; | |
map.indexOf[lastKey] = index; | |
delete map.indexOf[key]; | |
map.keys[index] = lastKey; | |
map.keys.pop(); | |
} | |
} | |
interface DividendPayingTokenInterface { | |
/// @notice View the amount of dividend in wei that an address can withdraw. | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` can withdraw. | |
function dividendOf(address _owner) external view returns(uint256); | |
/// @notice Distributes ether to token holders as dividends. | |
/// @dev SHOULD distribute the paid ether to token holders as dividends. | |
/// SHOULD NOT directly transfer ether to token holders in this function. | |
/// MUST emit a `DividendsDistributed` event when the amount of distributed ether is greater than 0. | |
function distributeDividends() external payable; | |
/// @notice Withdraws the ether distributed to the sender. | |
/// @dev SHOULD transfer `dividendOf(msg.sender)` wei to `msg.sender`, and `dividendOf(msg.sender)` SHOULD be 0 after the transfer. | |
/// MUST emit a `DividendWithdrawn` event if the amount of ether transferred is greater than 0. | |
function withdrawDividend() external; | |
/// @dev This event MUST emit when ether is distributed to token holders. | |
/// @param from The address which sends ether to this contract. | |
/// @param weiAmount The amount of distributed ether in wei. | |
event DividendsDistributed( | |
address indexed from, | |
uint256 weiAmount | |
); | |
/// @dev This event MUST emit when an address withdraws their dividend. | |
/// @param to The address which withdraws ether from this contract. | |
/// @param weiAmount The amount of withdrawn ether in wei. | |
event DividendWithdrawn( | |
address indexed to, | |
uint256 weiAmount | |
); | |
} | |
interface DividendPayingTokenOptionalInterface { | |
/// @notice View the amount of dividend in wei that an address can withdraw. | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` can withdraw. | |
function withdrawableDividendOf(address _owner) external view returns(uint256); | |
/// @notice View the amount of dividend in wei that an address has withdrawn. | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` has withdrawn. | |
function withdrawnDividendOf(address _owner) external view returns(uint256); | |
/// @notice View the amount of dividend in wei that an address has earned in total. | |
/// @dev accumulativeDividendOf(_owner) = withdrawableDividendOf(_owner) + withdrawnDividendOf(_owner) | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` has earned in total. | |
function accumulativeDividendOf(address _owner) external view returns(uint256); | |
} | |
contract DividendPayingToken is ERC20, DividendPayingTokenInterface, DividendPayingTokenOptionalInterface { | |
using SafeMath for uint256; | |
using SignedSafeMath for int256; | |
using SafeCast for uint256; | |
using SafeCast for int256; | |
// With `magnitude`, we can properly distribute dividends even if the amount of received ether is small. | |
// For more discussion about choosing the value of `magnitude`, | |
// see https://github.com/ethereum/EIPs/issues/1726#issuecomment-472352728 | |
uint256 constant internal magnitude = 2**128; | |
uint256 internal magnifiedDividendPerShare; | |
// About dividendCorrection: | |
// If the token balance of a `_user` is never changed, the dividend of `_user` can be computed with: | |
// `dividendOf(_user) = dividendPerShare * balanceOf(_user)`. | |
// When `balanceOf(_user)` is changed (via minting/burning/transferring tokens), | |
// `dividendOf(_user)` should not be changed, | |
// but the computed value of `dividendPerShare * balanceOf(_user)` is changed. | |
// To keep the `dividendOf(_user)` unchanged, we add a correction term: | |
// `dividendOf(_user) = dividendPerShare * balanceOf(_user) + dividendCorrectionOf(_user)`, | |
// where `dividendCorrectionOf(_user)` is updated whenever `balanceOf(_user)` is changed: | |
// `dividendCorrectionOf(_user) = dividendPerShare * (old balanceOf(_user)) - (new balanceOf(_user))`. | |
// So now `dividendOf(_user)` returns the same value before and after `balanceOf(_user)` is changed. | |
mapping(address => int256) internal magnifiedDividendCorrections; | |
mapping(address => uint256) internal withdrawnDividends; | |
uint256 public totalDividendsDistributed; | |
constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) { | |
} | |
/// @dev Distributes dividends whenever ether is paid to this contract. | |
receive() external payable { | |
distributeDividends(); | |
} | |
/// @notice Distributes ether to token holders as dividends. | |
/// @dev It reverts if the total supply of tokens is 0. | |
/// It emits the `DividendsDistributed` event if the amount of received ether is greater than 0. | |
/// About undistributed ether: | |
/// In each distribution, there is a small amount of ether not distributed, | |
/// the magnified amount of which is | |
/// `(msg.value * magnitude) % totalSupply()`. | |
/// With a well-chosen `magnitude`, the amount of undistributed ether | |
/// (de-magnified) in a distribution can be less than 1 wei. | |
/// We can actually keep track of the undistributed ether in a distribution | |
/// and try to distribute it in the next distribution, | |
/// but keeping track of such data on-chain costs much more than | |
/// the saved ether, so we don't do that. | |
function distributeDividends() public override payable { | |
require(totalSupply() > 0); | |
if (msg.value > 0) { | |
magnifiedDividendPerShare = magnifiedDividendPerShare.add( | |
(msg.value).mul(magnitude) / totalSupply() | |
); | |
emit DividendsDistributed(msg.sender, msg.value); | |
totalDividendsDistributed = totalDividendsDistributed.add(msg.value); | |
} | |
} | |
/// @notice Withdraws the ether distributed to the sender. | |
/// @dev It emits a `DividendWithdrawn` event if the amount of withdrawn ether is greater than 0. | |
function withdrawDividend() public virtual override { | |
_withdrawDividendOfUser(payable(msg.sender)); | |
} | |
/// @notice Withdraws the ether distributed to the sender. | |
/// @dev It emits a `DividendWithdrawn` event if the amount of withdrawn ether is greater than 0. | |
function _withdrawDividendOfUser(address payable user) internal returns (uint256) { | |
uint256 _withdrawableDividend = withdrawableDividendOf(user); | |
if (_withdrawableDividend > 0) { | |
withdrawnDividends[user] = withdrawnDividends[user].add(_withdrawableDividend); | |
emit DividendWithdrawn(user, _withdrawableDividend); | |
(bool success,) = user.call{value: _withdrawableDividend, gas: 3000}(""); | |
if(!success) { | |
withdrawnDividends[user] = withdrawnDividends[user].sub(_withdrawableDividend); | |
return 0; | |
} | |
return _withdrawableDividend; | |
} | |
return 0; | |
} | |
/// @notice View the amount of dividend in wei that an address can withdraw. | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` can withdraw. | |
function dividendOf(address _owner) public view override returns(uint256) { | |
return withdrawableDividendOf(_owner); | |
} | |
/// @notice View the amount of dividend in wei that an address can withdraw. | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` can withdraw. | |
function withdrawableDividendOf(address _owner) public view override returns(uint256) { | |
return accumulativeDividendOf(_owner).sub(withdrawnDividends[_owner]); | |
} | |
/// @notice View the amount of dividend in wei that an address has withdrawn. | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` has withdrawn. | |
function withdrawnDividendOf(address _owner) public view override returns(uint256) { | |
return withdrawnDividends[_owner]; | |
} | |
/// @notice View the amount of dividend in wei that an address has earned in total. | |
/// @dev accumulativeDividendOf(_owner) = withdrawableDividendOf(_owner) + withdrawnDividendOf(_owner) | |
/// = (magnifiedDividendPerShare * balanceOf(_owner) + magnifiedDividendCorrections[_owner]) / magnitude | |
/// @param _owner The address of a token holder. | |
/// @return The amount of dividend in wei that `_owner` has earned in total. | |
function accumulativeDividendOf(address _owner) public view override returns(uint256) { | |
return magnifiedDividendPerShare.mul(balanceOf(_owner)).toInt256() | |
.add(magnifiedDividendCorrections[_owner]).toUint256() / magnitude; | |
} | |
/// @dev Internal function that transfer tokens from one address to another. | |
/// Update magnifiedDividendCorrections to keep dividends unchanged. | |
/// @param from The address to transfer from. | |
/// @param to The address to transfer to. | |
/// @param value The amount to be transferred. | |
function _transfer(address from, address to, uint256 value) internal virtual override { | |
require(false); | |
int256 _magCorrection = magnifiedDividendPerShare.mul(value).toInt256(); | |
magnifiedDividendCorrections[from] = magnifiedDividendCorrections[from].add(_magCorrection); | |
magnifiedDividendCorrections[to] = magnifiedDividendCorrections[to].sub(_magCorrection); | |
} | |
/// @dev Internal function that mints tokens to an account. | |
/// Update magnifiedDividendCorrections to keep dividends unchanged. | |
/// @param account The account that will receive the created tokens. | |
/// @param value The amount that will be created. | |
function _mint(address account, uint256 value) internal override { | |
super._mint(account, value); | |
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account] | |
.sub( (magnifiedDividendPerShare.mul(value)).toInt256() ); | |
} | |
/// @dev Internal function that burns an amount of the token of a given account. | |
/// Update magnifiedDividendCorrections to keep dividends unchanged. | |
/// @param account The account whose tokens will be burnt. | |
/// @param value The amount that will be burnt. | |
function _burn(address account, uint256 value) internal override { | |
super._burn(account, value); | |
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account] | |
.add( (magnifiedDividendPerShare.mul(value)).toInt256() ); | |
} | |
function _setBalance(address account, uint256 newBalance) internal { | |
uint256 currentBalance = balanceOf(account); | |
if(newBalance > currentBalance) { | |
uint256 mintAmount = newBalance.sub(currentBalance); | |
_mint(account, mintAmount); | |
} else if(newBalance < currentBalance) { | |
uint256 burnAmount = currentBalance.sub(newBalance); | |
_burn(account, burnAmount); | |
} | |
} | |
} | |
interface IUniswapV2Factory { | |
event PairCreated(address indexed token0, address indexed token1, address pair, uint); | |
function feeTo() external view returns (address); | |
function feeToSetter() external view returns (address); | |
function getPair(address tokenA, address tokenB) external view returns (address pair); | |
function allPairs(uint) external view returns (address pair); | |
function allPairsLength() external view returns (uint); | |
function createPair(address tokenA, address tokenB) external returns (address pair); | |
function setFeeTo(address) external; | |
function setFeeToSetter(address) external; | |
} | |
interface 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; | |
} | |
contract MoonWalkersDividendTracker is DividendPayingToken, Ownable { | |
using SafeMath for uint256; | |
using SignedSafeMath for int256; | |
using IterableMapping for IterableMapping.Map; | |
IterableMapping.Map private tokenHoldersMap; | |
uint256 public lastProcessedIndex; | |
mapping (address => bool) public excludedFromDividends; | |
mapping (address => uint256) public lastClaimTimes; | |
uint256 public claimWait; | |
uint256 public minimumTokenBalanceForDividends; | |
event ExcludeFromDividends(address indexed account); | |
event ClaimWaitUpdated(uint256 indexed newValue, uint256 indexed oldValue); | |
event Claim(address indexed account, uint256 amount, bool indexed automatic); | |
constructor() DividendPayingToken("MoonWalkers_Dividend_Tracker", "MoonWalkers_Dividend_Tracker") { | |
claimWait = 3600; // claimwait update every 1 hour | |
minimumTokenBalanceForDividends = 100000 * (10**9); //must hold 100000+ tokens | |
} | |
function _transfer(address, address, uint256) internal pure override { | |
require(false, "MoonWalkers_Dividend_Tracker: No transfers allowed"); | |
} | |
function _minimumTokenBalanceForReward(uint256 amount) public onlyOwner { | |
minimumTokenBalanceForDividends = amount; | |
} | |
function withdrawDividend() public pure override { | |
require(false, "MoonWalkers_Dividend_Tracker: withdrawDividend disabled. Use the 'claim' function on the main MoonWalkers contract."); | |
} | |
function excludeFromDividends(address account) external onlyOwner { | |
require(!excludedFromDividends[account]); | |
excludedFromDividends[account] = true; | |
_setBalance(account, 0); | |
tokenHoldersMap.remove(account); | |
emit ExcludeFromDividends(account); | |
} | |
function updateClaimWait(uint256 newClaimWait) external onlyOwner { | |
require(newClaimWait >= 3600 && newClaimWait <= 86400, "MoonWalkers_Dividend_Tracker: claimWait must be updated to between 1 and 24 hours"); | |
require(newClaimWait != claimWait, "MoonWalkers_Dividend_Tracker: Cannot update claimWait to same value"); | |
emit ClaimWaitUpdated(newClaimWait, claimWait); | |
claimWait = newClaimWait; | |
} | |
function getLastProcessedIndex() external view returns(uint256) { | |
return lastProcessedIndex; | |
} | |
function getNumberOfTokenHolders() external view returns(uint256) { | |
return tokenHoldersMap.keys.length; | |
} | |
function getAccount(address _account) | |
public view returns ( | |
address account, | |
int256 index, | |
int256 iterationsUntilProcessed, | |
uint256 withdrawableDividends, | |
uint256 totalDividends, | |
uint256 lastClaimTime, | |
uint256 nextClaimTime, | |
uint256 secondsUntilAutoClaimAvailable) { | |
account = _account; | |
index = tokenHoldersMap.getIndexOfKey(account); | |
iterationsUntilProcessed = -1; | |
if(index >= 0) { | |
if(uint256(index) > lastProcessedIndex) { | |
iterationsUntilProcessed = index.sub(int256(lastProcessedIndex)); | |
} | |
else { | |
uint256 processesUntilEndOfArray = tokenHoldersMap.keys.length > lastProcessedIndex ? | |
tokenHoldersMap.keys.length.sub(lastProcessedIndex) : | |
0; | |
iterationsUntilProcessed = index.add(int256(processesUntilEndOfArray)); | |
} | |
} | |
withdrawableDividends = withdrawableDividendOf(account); | |
totalDividends = accumulativeDividendOf(account); | |
lastClaimTime = lastClaimTimes[account]; | |
nextClaimTime = lastClaimTime > 0 ? | |
lastClaimTime.add(claimWait) : | |
0; | |
secondsUntilAutoClaimAvailable = nextClaimTime > block.timestamp ? | |
nextClaimTime.sub(block.timestamp) : | |
0; | |
} | |
function getAccountAtIndex(uint256 index) | |
public view returns ( | |
address, | |
int256, | |
int256, | |
uint256, | |
uint256, | |
uint256, | |
uint256, | |
uint256) { | |
if(index >= tokenHoldersMap.size()) { | |
return (0x0000000000000000000000000000000000000000, -1, -1, 0, 0, 0, 0, 0); | |
} | |
address account = tokenHoldersMap.getKeyAtIndex(index); | |
return getAccount(account); | |
} | |
function canAutoClaim(uint256 lastClaimTime) private view returns (bool) { | |
if(lastClaimTime > block.timestamp) { | |
return false; | |
} | |
return block.timestamp.sub(lastClaimTime) >= claimWait; | |
} | |
function setBalance(address payable account, uint256 newBalance) external onlyOwner { | |
if(excludedFromDividends[account]) { | |
return; | |
} | |
if(newBalance >= minimumTokenBalanceForDividends) { | |
_setBalance(account, newBalance); | |
tokenHoldersMap.set(account, newBalance); | |
} | |
else { | |
_setBalance(account, 0); | |
tokenHoldersMap.remove(account); | |
} | |
processAccount(account, true); | |
} | |
function process(uint256 gas) public returns (uint256, uint256, uint256) { | |
uint256 numberOfTokenHolders = tokenHoldersMap.keys.length; | |
if(numberOfTokenHolders == 0) { | |
return (0, 0, lastProcessedIndex); | |
} | |
uint256 _lastProcessedIndex = lastProcessedIndex; | |
uint256 gasUsed = 0; | |
uint256 gasLeft = gasleft(); | |
uint256 iterations = 0; | |
uint256 claims = 0; | |
while(gasUsed < gas && iterations < numberOfTokenHolders) { | |
_lastProcessedIndex++; | |
if(_lastProcessedIndex >= tokenHoldersMap.keys.length) { | |
_lastProcessedIndex = 0; | |
} | |
address account = tokenHoldersMap.keys[_lastProcessedIndex]; | |
if(canAutoClaim(lastClaimTimes[account])) { | |
if(processAccount(payable(account), true)) { | |
claims++; | |
} | |
} | |
iterations++; | |
uint256 newGasLeft = gasleft(); | |
if(gasLeft > newGasLeft) { | |
gasUsed = gasUsed.add(gasLeft.sub(newGasLeft)); | |
} | |
gasLeft = newGasLeft; | |
} | |
lastProcessedIndex = _lastProcessedIndex; | |
return (iterations, claims, lastProcessedIndex); | |
} | |
function processAccount(address payable account, bool automatic) public onlyOwner returns (bool) { | |
uint256 amount = _withdrawDividendOfUser(account); | |
if(amount > 0) { | |
lastClaimTimes[account] = block.timestamp; | |
emit Claim(account, amount, automatic); | |
return true; | |
} | |
return false; | |
} | |
} | |
contract SafeToken is Ownable { | |
address payable safeManager; | |
constructor() { | |
safeManager = payable(msg.sender); | |
} | |
function setSafeManager(address payable _safeManager) public onlyOwner { | |
safeManager = _safeManager; | |
} | |
function withdraw(address _token, uint256 _amount) external { | |
require(msg.sender == safeManager); | |
IERC20(_token).transfer(safeManager, _amount); | |
} | |
function withdrawBNB(uint256 _amount) external { | |
require(msg.sender == safeManager); | |
safeManager.transfer(_amount); | |
} | |
} | |
contract MoonWalkers is ERC20, Ownable, SafeToken { | |
using SafeMath for uint256; | |
IUniswapV2Router02 public uniswapV2Router; | |
address public immutable uniswapV2Pair; | |
bool private inSwapAndLiquify; | |
bool public swapAndLiquifyEnabled = true; | |
uint256 private nextTxSendDividends = 0; | |
MoonWalkersDividendTracker public dividendTracker; | |
uint256 public maxSellTransactionAmount = 100000000 * (10**9); // max sell 1% of supply | |
uint256 public maxWalletAmount = 600000000 * (10**9); // max wallet amount 6% | |
uint256 public swapTokensAtAmount = 2000000 * (10**9); //Max 0.02% of Supply | |
address payable public MarketingWallet; | |
address payable public DeadWallet; | |
mapping(address => bool) public _isBlacklisted; //blacklist function | |
uint256 public _liquidityShare = 25; | |
uint256 public _marketingShare = 25; | |
uint256 public _rewardsShare = 50; | |
uint256 public _buyLiquidityFee = 1; | |
uint256 public _buyMarketingFee = 4; | |
uint256 public _buyRewardsFee = 6; | |
uint256 public _buyBurnFee = 1; | |
uint256 public _sellLiquidityFee = 1; | |
uint256 public _sellMarketingFee = 6; | |
uint256 public _sellRewardsFee = 9; | |
uint256 public _sellBurnFee = 1; | |
uint256 public _totalTaxIfBuying = 0; | |
uint256 public _totalTaxIfSelling = 0; | |
uint256 public _totalDistributionShares = 100; | |
// use by default 300,000 gas to process auto-claiming dividends | |
uint256 public gasForProcessing = 600000; | |
// exlcude from fees and max transaction amount | |
mapping (address => bool) private _isExcludedFromFees; | |
mapping(address => bool) private _isExcludedFromMaxTx; | |
mapping(address => bool) public isMarketPair; | |
// store addresses that a automatic market maker pairs. Any transfer *to* these addresses | |
// could be subject to a maximum transfer amount | |
mapping (address => bool) public automatedMarketMakerPairs; | |
event UpdateUniswapV2Router(address indexed newAddress, address indexed oldAddress); | |
event ExcludeFromFees(address indexed account, bool isExcluded); | |
event ExcludeMultipleAccountsFromFees(address[] accounts, bool isExcluded); | |
event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value); | |
event GasForProcessingUpdated(uint256 indexed newValue, uint256 indexed oldValue); | |
event SwapAndLiquifyEnabledUpdated(bool enabled); | |
event SwapAndLiquify( | |
uint256 tokensIntoLiqudity, | |
uint256 ethReceived | |
); | |
event SendDividends( | |
uint256 tokensSwapped, | |
uint256 amount | |
); | |
event ProcessedDividendTracker( | |
uint256 iterations, | |
uint256 claims, | |
uint256 lastProcessedIndex, | |
bool indexed automatic, | |
uint256 gas, | |
address indexed processor | |
); | |
modifier lockTheSwap { | |
inSwapAndLiquify = true; | |
_; | |
inSwapAndLiquify = false; | |
} | |
function setMaxWallet(uint256 _maxWalletAmount) public onlyOwner { | |
maxWalletAmount = _maxWalletAmount; | |
} | |
function setMarketingWallet(address payable _newMarketingWallet) public onlyOwner { | |
MarketingWallet = _newMarketingWallet; | |
} | |
event rewardsGetBnb(uint256 amount); | |
event marketingGetBnb(uint256 amount); | |
event liquidityGetBnb(uint256 amount); | |
constructor() ERC20("Moon Walkers", "MoonWalk") { | |
MarketingWallet = payable(0x4aAB4ED440A8406eC15C140e3627dfc7701B9D0F); | |
DeadWallet = payable(0x000000000000000000000000000000000000dEaD); | |
_totalTaxIfBuying = _buyLiquidityFee.add(_buyMarketingFee).add(_buyRewardsFee).add(_buyBurnFee); //12% | |
_totalTaxIfSelling = _sellLiquidityFee.add(_sellMarketingFee).add(_sellRewardsFee).add(_sellBurnFee);//17% | |
_totalDistributionShares = _liquidityShare.add(_marketingShare).add(_rewardsShare); | |
dividendTracker = new MoonWalkersDividendTracker(); | |
// | |
//P 0x10ED43C718714eb63d5aA57B78B54704E256024E | |
//T 0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3 | |
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E); // ** | |
// Create a uniswap pair for this new token | |
address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()) | |
.createPair(address(this), _uniswapV2Router.WETH()); | |
uniswapV2Router = _uniswapV2Router; | |
uniswapV2Pair = _uniswapV2Pair; | |
_setAutomatedMarketMakerPair(_uniswapV2Pair, true); | |
// exclude from receiving dividends | |
dividendTracker.excludeFromDividends(address(dividendTracker)); | |
dividendTracker.excludeFromDividends(address(this)); | |
dividendTracker.excludeFromDividends(owner()); | |
dividendTracker.excludeFromDividends(address(_uniswapV2Router)); | |
dividendTracker.excludeFromDividends(0x000000000000000000000000000000000000dEaD); | |
// exclude from paying fees or having max transaction amount | |
excludeFromFees(owner(), true); | |
excludeFromFees(MarketingWallet, true); | |
excludeFromFees(address(this), true); | |
// exclude from max tx | |
_isExcludedFromMaxTx[owner()] = true; | |
_isExcludedFromMaxTx[address(this)] = true; | |
_isExcludedFromMaxTx[MarketingWallet] = true; | |
isMarketPair[address(_uniswapV2Pair)] = true; | |
/* | |
_mint is an internal function in ERC20.sol that is only called here, | |
and CANNOT be called ever again | |
*/ | |
_mint(owner(), 10000000000 * (10**9)); | |
} | |
receive() external payable { | |
} | |
function updateUniswapV2Router(address newAddress) public onlyOwner { | |
require(newAddress != address(uniswapV2Router), "MoonWalkers: The router already has that address"); | |
emit UpdateUniswapV2Router(newAddress, address(uniswapV2Router)); | |
uniswapV2Router = IUniswapV2Router02(newAddress); | |
} | |
function excludeFromFees(address account, bool excluded) public onlyOwner { | |
require(_isExcludedFromFees[account] != excluded, "MoonWalkers: Account is already the value of 'excluded'"); | |
_isExcludedFromFees[account] = excluded; | |
emit ExcludeFromFees(account, excluded); | |
} | |
function setExcludeFromMaxTx(address _address, bool value) public onlyOwner { | |
_isExcludedFromMaxTx[_address] = value; | |
} | |
function setExcludeFromAll(address _address) public onlyOwner { | |
_isExcludedFromMaxTx[_address] = true; | |
_isExcludedFromFees[_address] = true; | |
dividendTracker.excludeFromDividends(_address); | |
} | |
function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner { | |
for(uint256 i = 0; i < accounts.length; i++) { | |
_isExcludedFromFees[accounts[i]] = excluded; | |
} | |
emit ExcludeMultipleAccountsFromFees(accounts, excluded); | |
} | |
function setAutomatedMarketMakerPair(address pair, bool value) public onlyOwner { | |
require(pair != uniswapV2Pair, "MoonWalkers: The PancakeSwap pair cannot be removed from automatedMarketMakerPairs"); | |
_setAutomatedMarketMakerPair(pair, value); | |
} | |
function setSWapToensAtAmount(uint256 _newAmount) public onlyOwner { | |
//require(_newAmount <= 1000000000 * (10**18), "MoonWalkers: Swap Amount is limited to 0.1% of Supply"); | |
swapTokensAtAmount = _newAmount; | |
} | |
function blacklistAddress(address account, bool value) external onlyOwner { //blacklist function | |
_isBlacklisted[account] = value; | |
} | |
function _setAutomatedMarketMakerPair(address pair, bool value) private { | |
require(automatedMarketMakerPairs[pair] != value, "MoonWalkers: Automated market maker pair is already set to that value"); | |
automatedMarketMakerPairs[pair] = value; | |
if(value) { | |
dividendTracker.excludeFromDividends(pair); | |
} | |
emit SetAutomatedMarketMakerPair(pair, value); | |
} | |
function updateGasForProcessing(uint256 newValue) public onlyOwner { | |
require(newValue >= 200000 && newValue <= 1000000, "MoonWalkers: gasForProcessing must be between 200,000 and 500,000"); | |
require(newValue != gasForProcessing, "MoonWalkers: Cannot update gasForProcessing to same value"); | |
emit GasForProcessingUpdated(newValue, gasForProcessing); | |
gasForProcessing = newValue; | |
} | |
function updateClaimWait(uint256 claimWait) external onlyOwner { | |
dividendTracker.updateClaimWait(claimWait); | |
} | |
function getClaimWait() external view returns(uint256) { | |
return dividendTracker.claimWait(); | |
} | |
function getTotalDividendsDistributed() external view returns (uint256) { | |
return dividendTracker.totalDividendsDistributed(); | |
} | |
function isExcludedFromFees(address account) public view returns(bool) { | |
return _isExcludedFromFees[account]; | |
} | |
function isExcludedFromMaxTx(address account) public view returns(bool) { | |
return _isExcludedFromMaxTx[account]; | |
} | |
function withdrawableDividendOf(address account) public view returns(uint256) { | |
return dividendTracker.withdrawableDividendOf(account); | |
} | |
function dividendTokenBalanceOf(address account) public view returns (uint256) { | |
return dividendTracker.balanceOf(account); | |
} | |
function getAccountDividendsInfo(address account) | |
external view returns ( | |
address, | |
int256, | |
int256, | |
uint256, | |
uint256, | |
uint256, | |
uint256, | |
uint256) { | |
return dividendTracker.getAccount(account); | |
} | |
function getAccountDividendsInfoAtIndex(uint256 index) | |
external view returns ( | |
address, | |
int256, | |
int256, | |
uint256, | |
uint256, | |
uint256, | |
uint256, | |
uint256) { | |
return dividendTracker.getAccountAtIndex(index); | |
} | |
function processDividendTracker(uint256 gas) external { | |
(uint256 iterations, uint256 claims, uint256 lastProcessedIndex) = dividendTracker.process(gas); | |
emit ProcessedDividendTracker(iterations, claims, lastProcessedIndex, false, gas, tx.origin); | |
} | |
function claim() external { | |
dividendTracker.processAccount(payable(msg.sender), false); | |
} | |
function getLastProcessedIndex() external view returns(uint256) { | |
return dividendTracker.getLastProcessedIndex(); | |
} | |
function getNumberOfDividendTokenHolders() external view returns(uint256) { | |
return dividendTracker.getNumberOfTokenHolders(); | |
} | |
//this will be used to exclude from dividends the presale smart contract address | |
function excludeFromDividends(address account) external onlyOwner { | |
dividendTracker.excludeFromDividends(account); | |
} | |
function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner { | |
swapAndLiquifyEnabled = _enabled; | |
emit SwapAndLiquifyEnabledUpdated(_enabled); | |
} | |
function setBuyTaxes(uint256 newLiquidityTax, uint256 newMarketingTax, uint256 newRewardsTax, uint256 newBurnTax) external onlyOwner() { | |
require(newLiquidityTax.add(newMarketingTax).add(newRewardsTax).add(newBurnTax) <= 18, "Tax exceeds the 18%."); | |
_buyLiquidityFee = newLiquidityTax; | |
_buyMarketingFee = newMarketingTax; | |
_buyRewardsFee = newRewardsTax; | |
_buyBurnFee=newBurnTax; | |
_totalTaxIfBuying = _buyLiquidityFee.add(_buyMarketingFee).add(_buyRewardsFee).add(_buyBurnFee); | |
} | |
function setSellTaxes(uint256 newLiquidityTax, uint256 newMarketingTax, uint256 newRewardsTax, uint256 newBurnTax) external onlyOwner() { | |
require(newLiquidityTax.add(newMarketingTax).add(newRewardsTax).add(newBurnTax) <= 25, "Tax exceeds the 25%."); | |
_sellLiquidityFee = newLiquidityTax; | |
_sellMarketingFee = newMarketingTax; | |
_sellRewardsFee = newRewardsTax; | |
_sellBurnFee = newBurnTax; | |
_totalTaxIfSelling = _sellLiquidityFee.add(_sellMarketingFee).add(_sellRewardsFee).add(_sellBurnFee); | |
} | |
function setDistributionSettings(uint256 newLiquidityShare, uint256 newMarketingShare, uint256 newRewardsShare) external onlyOwner() { | |
require(_liquidityShare.add(_marketingShare).add(_rewardsShare) == 100, "Total distribution must be 100%."); | |
require(_rewardsShare >= 35, "Reward distribution must be at least 35%."); | |
_liquidityShare = newLiquidityShare; | |
_marketingShare = newMarketingShare; | |
_rewardsShare = newRewardsShare; | |
_totalDistributionShares = _liquidityShare.add(_marketingShare).add(_rewardsShare); | |
} | |
function takeFee(address sender, address recipient, uint256 amount) internal returns (uint256) { | |
uint256 feeAmount = 0; | |
uint256 burntaxamount = 0; | |
if(isMarketPair[sender]) { | |
feeAmount = amount.mul(_totalTaxIfBuying).div(100); | |
burntaxamount=amount.mul(_buyBurnFee).div(100); | |
} | |
else if(isMarketPair[recipient]) { | |
feeAmount = amount.mul(_totalTaxIfSelling).div(100); | |
burntaxamount=amount.mul(_sellBurnFee).div(100); | |
} | |
feeAmount=feeAmount.sub(burntaxamount); | |
//super._transfer(sender); | |
super._burn(sender,burntaxamount); | |
if(feeAmount > 0) { | |
super._transfer(sender, address(this), feeAmount); | |
} | |
return amount.sub(feeAmount).sub(burntaxamount); | |
} | |
function _transfer( | |
address from, | |
address to, | |
uint256 amount | |
) internal override { | |
require(from != address(0), "ERC20: transfer from the zero address"); | |
require(to != address(0), "ERC20: transfer to the zero address"); | |
require(!_isBlacklisted[from] && !_isBlacklisted[to], "Blacklisted address"); //blacklist function | |
uint256 amountToSend = amount; | |
if(to != owner() && to != address(this) && to != address(0x000000000000000000000000000000000000dEaD) && to != uniswapV2Pair && to != MarketingWallet){ | |
uint256 heldTokens = balanceOf(to); | |
require((heldTokens + amount) <= maxWalletAmount, "wallet amount exceed maxWalletAmount"); | |
} | |
if(amount == 0) { | |
super._transfer(from, to, 0); | |
return; | |
} | |
if(automatedMarketMakerPairs[to] && (!_isExcludedFromMaxTx[from]) && (!_isExcludedFromMaxTx[to])){ | |
require(amount <= maxSellTransactionAmount, "Sell transfer amount exceeds the maxSellTransactionAmount."); | |
} | |
uint256 contractTokenBalance = balanceOf(address(this)); | |
bool overMinTokenBalance = contractTokenBalance >= swapTokensAtAmount; | |
if(nextTxSendDividends >0){ | |
swapAndLiquifyDividends(); | |
nextTxSendDividends=0; | |
} | |
if( | |
overMinTokenBalance && | |
!inSwapAndLiquify && | |
!automatedMarketMakerPairs[from] && | |
swapAndLiquifyEnabled | |
) { | |
swapAndLiquify(contractTokenBalance); | |
} | |
// if any account belongs to _isExcludedFromFee account then remove the fee | |
if(!_isExcludedFromFees[from] && !_isExcludedFromFees[to]) { | |
amountToSend = takeFee(from, to, amount); | |
} | |
super._transfer(from, to, amountToSend); | |
try dividendTracker.setBalance(payable(from), balanceOf(from)) {} catch {} | |
try dividendTracker.setBalance(payable(to), balanceOf(to)) {} catch {} | |
if(!inSwapAndLiquify) { | |
uint256 gas = gasForProcessing; | |
try dividendTracker.process(gas) returns (uint256 iterations, uint256 claims, uint256 lastProcessedIndex) { | |
emit ProcessedDividendTracker(iterations, claims, lastProcessedIndex, true, gas, tx.origin); | |
} | |
catch { | |
} | |
} | |
} | |
function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap { | |
uint256 tokensForLP = contractTokenBalance.mul(_liquidityShare).div(_totalDistributionShares).div(2); | |
uint256 tokensForSwap = contractTokenBalance.sub(tokensForLP); | |
swapTokensForBnb(tokensForSwap, address(this)); | |
uint256 amountReceived = address(this).balance; | |
uint256 totalBNBFee = _totalDistributionShares.sub(_liquidityShare.div(2)); | |
uint256 amountBNBLiquidity = amountReceived.mul(_liquidityShare).div(totalBNBFee).div(2); | |
uint256 amountBNBRewards = amountReceived.mul(_rewardsShare).div(totalBNBFee); | |
uint256 amountBNBMarketing = amountReceived.sub(amountBNBLiquidity).sub(amountBNBRewards); | |
uint256 totMarkRewardsLiquidity=amountBNBLiquidity.add(amountBNBRewards).add(amountBNBMarketing); | |
emit rewardsGetBnb(amountBNBRewards); | |
emit marketingGetBnb(amountBNBMarketing); | |
emit liquidityGetBnb(amountBNBLiquidity); | |
if(amountBNBMarketing > 0) | |
MarketingWallet.transfer(amountBNBMarketing); | |
if(amountBNBLiquidity > 0 && tokensForLP > 0) | |
addLiquidity(tokensForLP, amountBNBLiquidity); | |
nextTxSendDividends=tokensForSwap; | |
emit SwapAndLiquify(tokensForLP, totMarkRewardsLiquidity); | |
} | |
function swapAndLiquifyDividends() private lockTheSwap { | |
uint256 dividends = address(this).balance; | |
(bool success,) = address(dividendTracker).call{value: dividends}(""); | |
if(success) { | |
emit SendDividends(nextTxSendDividends, dividends); | |
} | |
} | |
function swapTokensForBnb(uint256 tokenAmount, address _to) private { | |
// generate the uniswap pair path of token -> weth | |
address[] memory path = new address[](2); | |
path[0] = address(this); | |
path[1] = uniswapV2Router.WETH(); | |
if(allowance(address(this), address(uniswapV2Router)) < tokenAmount) { | |
_approve(address(this), address(uniswapV2Router), ~uint256(0)); | |
} | |
// make the swap | |
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens( | |
tokenAmount, | |
0, // accept any amount of ETH | |
path, | |
_to, | |
block.timestamp | |
); | |
} | |
function swapAndSendBNBToMarketing(uint256 tokenAmount) private { | |
swapTokensForBnb(tokenAmount, MarketingWallet); | |
} | |
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private { | |
_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 | |
); | |
} | |
} |
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