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Overview
ETH Balance
0 ETH
Eth Value
$0.00Token Holdings
More Info
Private Name Tags
ContractCreator
TokenTracker
Latest 25 from a total of 46 transactions
| Transaction Hash |
Method
|
Block
|
From
|
To
|
|||||
|---|---|---|---|---|---|---|---|---|---|
| Approve | 20748491 | 20 days ago | IN | 0 ETH | 0.00010725 | ||||
| Approve | 20742132 | 20 days ago | IN | 0 ETH | 0.00013561 | ||||
| Batch Process Cl... | 20742093 | 20 days ago | IN | 0 ETH | 0.00023973 | ||||
| Claim Pending | 20741976 | 20 days ago | IN | 0 ETH | 0.00008593 | ||||
| Approve | 20674467 | 30 days ago | IN | 0 ETH | 0.00008551 | ||||
| Approve | 20494865 | 55 days ago | IN | 0 ETH | 0.00006814 | ||||
| Approve | 20489150 | 56 days ago | IN | 0 ETH | 0.00009224 | ||||
| Approve | 20488525 | 56 days ago | IN | 0 ETH | 0.00010046 | ||||
| Approve | 20438931 | 63 days ago | IN | 0 ETH | 0.00010974 | ||||
| Approve | 20419262 | 65 days ago | IN | 0 ETH | 0.00039916 | ||||
| Set Sell Tax | 20414009 | 66 days ago | IN | 0 ETH | 0.00011426 | ||||
| Set Buy Tax | 20414007 | 66 days ago | IN | 0 ETH | 0.00010963 | ||||
| Set Tax Active | 20414002 | 66 days ago | IN | 0 ETH | 0.00012977 | ||||
| Approve | 20408249 | 67 days ago | IN | 0 ETH | 0.00009772 | ||||
| Set Pair | 20408175 | 67 days ago | IN | 0 ETH | 0.00007733 | ||||
| Claim Pending | 20408103 | 67 days ago | IN | 0 ETH | 0.00005315 | ||||
| Approve | 20408073 | 67 days ago | IN | 0 ETH | 0.00010126 | ||||
| Process Reserves | 20407839 | 67 days ago | IN | 0 ETH | 0.00007052 | ||||
| Exclude From Rew... | 20407835 | 67 days ago | IN | 0 ETH | 0.00013247 | ||||
| Approve | 20407754 | 67 days ago | IN | 0 ETH | 0.00007277 | ||||
| Approve | 20407379 | 67 days ago | IN | 0 ETH | 0.00122923 | ||||
| Set Pair | 20407372 | 67 days ago | IN | 0 ETH | 0.00011238 | ||||
| Approve | 20407191 | 67 days ago | IN | 0 ETH | 0.00014601 | ||||
| Transfer | 20407183 | 67 days ago | IN | 0 ETH | 0.0008813 | ||||
| Approve | 20407098 | 67 days ago | IN | 0 ETH | 0.00013445 |
Latest 3 internal transactions
Advanced mode:
| Parent Transaction Hash | Block | From | To | |||
|---|---|---|---|---|---|---|
| 20379886 | 71 days ago | Contract Creation | 0 ETH | |||
| 20379886 | 71 days ago | Contract Creation | 0 ETH | |||
| 20296986 | 83 days ago | Contract Creation | 0 ETH |
Loading...
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Contract Name:
DividendsTokenCustomSimple
Compiler Version
v0.8.19+commit.7dd6d404
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2024-07-25
*/
pragma solidity ^0.8.18;
//
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}
//
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
//
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* The default value of {decimals} is 18. To change this, you should override
* this function so it returns a different value.
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC20
* applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the default value returned by this function, unless
* it's overridden.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, 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}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, 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}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/**
* @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) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, 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) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* 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:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(address from, address to, uint256 amount) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, 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;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_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;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_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 Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @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 {}
}
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 IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
interface 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;
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since 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 subtraction 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;
}
}
}
//
abstract contract Ownable is Context {
address _owner;
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
constructor(address _ownerAddress) {
_transferOwnership(_ownerAddress);
}
modifier onlyOwner() {
_checkOwner();
_;
}
function owner() public view virtual returns (address) {
return _owner;
}
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(
newOwner != address(0),
"Ownable: new owner is the zero address"
);
_transferOwnership(newOwner);
}
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)
/**
* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*/
interface IERC20Permit {
/**
* @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
* given ``owner``'s signed approval.
*
* IMPORTANT: The same issues {IERC20-approve} has related to transaction
* ordering also apply here.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `deadline` must be a timestamp in the future.
* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
* over the EIP712-formatted function arguments.
* - the signature must use ``owner``'s current nonce (see {nonces}).
*
* For more information on the signature format, see the
* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
* section].
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the current nonce for `owner`. This value must be
* included whenever a signature is generated for {permit}.
*
* Every successful call to {permit} increases ``owner``'s nonce by one. This
* prevents a signature from being used multiple times.
*/
function nonces(address owner) external view returns (uint256);
/**
* @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view returns (bytes32);
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
/**
* @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
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
//
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
* Revert on invalid signature.
*/
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*
* This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
// and not revert is the subcall reverts.
(bool success, bytes memory returndata) = address(token).call(data);
return
success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
enum Rounding {
Down, // Toward negative infinity
Up, // Toward infinity
Zero // Toward zero
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
* with further edits by Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod0 := mul(x, y)
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
require(denominator > prod1, "Math: mulDiv overflow");
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
// See https://cs.stackexchange.com/q/138556/92363.
// Does not overflow because the denominator cannot be zero at this stage in the function.
uint256 twos = denominator & (~denominator + 1);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
// in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256, rounded down, of a positive value.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
}
}
}
//
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
/**
* @dev Standard signed math utilities missing in the Solidity language.
*/
library SignedMath {
/**
* @dev Returns the largest of two signed numbers.
*/
function max(int256 a, int256 b) internal pure returns (int256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two signed numbers.
*/
function min(int256 a, int256 b) internal pure returns (int256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two signed numbers without overflow.
* The result is rounded towards zero.
*/
function average(int256 a, int256 b) internal pure returns (int256) {
// Formula from the book "Hacker's Delight"
int256 x = (a & b) + ((a ^ b) >> 1);
return x + (int256(uint256(x) >> 255) & (a ^ b));
}
/**
* @dev Returns the absolute unsigned value of a signed value.
*/
function abs(int256 n) internal pure returns (uint256) {
unchecked {
// must be unchecked in order to support `n = type(int256).min`
return uint256(n >= 0 ? n : -n);
}
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
unchecked {
uint256 length = Math.log10(value) + 1;
string memory buffer = new string(length);
uint256 ptr;
/// @solidity memory-safe-assembly
assembly {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
/// @solidity memory-safe-assembly
assembly {
mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
}
value /= 10;
if (value == 0) break;
}
return buffer;
}
}
/**
* @dev Converts a `int256` to its ASCII `string` decimal representation.
*/
function toString(int256 value) internal pure returns (string memory) {
return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
unchecked {
return toHexString(value, Math.log256(value) + 1);
}
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
/**
* @dev Returns true if the two strings are equal.
*/
function equal(string memory a, string memory b) internal pure returns (bool) {
return keccak256(bytes(a)) == keccak256(bytes(b));
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/ECDSA.sol)
/**
* @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
*
* These functions can be used to verify that a message was signed by the holder
* of the private keys of a given address.
*/
library ECDSA {
enum RecoverError {
NoError,
InvalidSignature,
InvalidSignatureLength,
InvalidSignatureS,
InvalidSignatureV // Deprecated in v4.8
}
function _throwError(RecoverError error) private pure {
if (error == RecoverError.NoError) {
return; // no error: do nothing
} else if (error == RecoverError.InvalidSignature) {
revert("ECDSA: invalid signature");
} else if (error == RecoverError.InvalidSignatureLength) {
revert("ECDSA: invalid signature length");
} else if (error == RecoverError.InvalidSignatureS) {
revert("ECDSA: invalid signature 's' value");
}
}
/**
* @dev Returns the address that signed a hashed message (`hash`) with
* `signature` or error string. This address can then be used for verification purposes.
*
* The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {toEthSignedMessageHash} on it.
*
* Documentation for signature generation:
* - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
* - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
*
* _Available since v4.3._
*/
function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
if (signature.length == 65) {
bytes32 r;
bytes32 s;
uint8 v;
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
/// @solidity memory-safe-assembly
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
return tryRecover(hash, v, r, s);
} else {
return (address(0), RecoverError.InvalidSignatureLength);
}
}
/**
* @dev Returns the address that signed a hashed message (`hash`) with
* `signature`. This address can then be used for verification purposes.
*
* The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {toEthSignedMessageHash} on it.
*/
function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, signature);
_throwError(error);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
*
* See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
*
* _Available since v4.3._
*/
function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {
bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
uint8 v = uint8((uint256(vs) >> 255) + 27);
return tryRecover(hash, v, r, s);
}
/**
* @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
*
* _Available since v4.2._
*/
function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, r, vs);
_throwError(error);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `v`,
* `r` and `s` signature fields separately.
*
* _Available since v4.3._
*/
function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) {
// EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
// unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
// the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
// signatures from current libraries generate a unique signature with an s-value in the lower half order.
//
// If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
// with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
// vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
// these malleable signatures as well.
if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
return (address(0), RecoverError.InvalidSignatureS);
}
// If the signature is valid (and not malleable), return the signer address
address signer = ecrecover(hash, v, r, s);
if (signer == address(0)) {
return (address(0), RecoverError.InvalidSignature);
}
return (signer, RecoverError.NoError);
}
/**
* @dev Overload of {ECDSA-recover} that receives the `v`,
* `r` and `s` signature fields separately.
*/
function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
(address recovered, RecoverError error) = tryRecover(hash, v, r, s);
_throwError(error);
return recovered;
}
/**
* @dev Returns an Ethereum Signed Message, created from a `hash`. This
* produces hash corresponding to the one signed with the
* https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
* JSON-RPC method as part of EIP-191.
*
* See {recover}.
*/
function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {
// 32 is the length in bytes of hash,
// enforced by the type signature above
/// @solidity memory-safe-assembly
assembly {
mstore(0x00, "\x19Ethereum Signed Message:\n32")
mstore(0x1c, hash)
message := keccak256(0x00, 0x3c)
}
}
/**
* @dev Returns an Ethereum Signed Message, created from `s`. This
* produces hash corresponding to the one signed with the
* https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
* JSON-RPC method as part of EIP-191.
*
* See {recover}.
*/
function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
}
/**
* @dev Returns an Ethereum Signed Typed Data, created from a
* `domainSeparator` and a `structHash`. This produces hash corresponding
* to the one signed with the
* https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
* JSON-RPC method as part of EIP-712.
*
* See {recover}.
*/
function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
/// @solidity memory-safe-assembly
assembly {
let ptr := mload(0x40)
mstore(ptr, "\x19\x01")
mstore(add(ptr, 0x02), domainSeparator)
mstore(add(ptr, 0x22), structHash)
data := keccak256(ptr, 0x42)
}
}
/**
* @dev Returns an Ethereum Signed Data with intended validator, created from a
* `validator` and `data` according to the version 0 of EIP-191.
*
* See {recover}.
*/
function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
return keccak256(abi.encodePacked("\x19\x00", validator, data));
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.
/**
* @dev Library for reading and writing primitive types to specific storage slots.
*
* Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
* This library helps with reading and writing to such slots without the need for inline assembly.
*
* The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
*
* Example usage to set ERC1967 implementation slot:
* ```solidity
* contract ERC1967 {
* bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
*
* function _getImplementation() internal view returns (address) {
* return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
* }
*
* function _setImplementation(address newImplementation) internal {
* require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
* StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
* }
* }
* ```
*
* _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._
* _Available since v4.9 for `string`, `bytes`._
*/
library StorageSlot {
struct AddressSlot {
address value;
}
struct BooleanSlot {
bool value;
}
struct Bytes32Slot {
bytes32 value;
}
struct Uint256Slot {
uint256 value;
}
struct StringSlot {
string value;
}
struct BytesSlot {
bytes value;
}
/**
* @dev Returns an `AddressSlot` with member `value` located at `slot`.
*/
function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `BooleanSlot` with member `value` located at `slot`.
*/
function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
*/
function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `Uint256Slot` with member `value` located at `slot`.
*/
function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `StringSlot` with member `value` located at `slot`.
*/
function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `StringSlot` representation of the string storage pointer `store`.
*/
function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := store.slot
}
}
/**
* @dev Returns an `BytesSlot` with member `value` located at `slot`.
*/
function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := slot
}
}
/**
* @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
*/
function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
/// @solidity memory-safe-assembly
assembly {
r.slot := store.slot
}
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/ShortStrings.sol)
// | string | 0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA |
// | length | 0x BB |
type ShortString is bytes32;
/**
* @dev This library provides functions to convert short memory strings
* into a `ShortString` type that can be used as an immutable variable.
*
* Strings of arbitrary length can be optimized using this library if
* they are short enough (up to 31 bytes) by packing them with their
* length (1 byte) in a single EVM word (32 bytes). Additionally, a
* fallback mechanism can be used for every other case.
*
* Usage example:
*
* ```solidity
* contract Named {
* using ShortStrings for *;
*
* ShortString private immutable _name;
* string private _nameFallback;
*
* constructor(string memory contractName) {
* _name = contractName.toShortStringWithFallback(_nameFallback);
* }
*
* function name() external view returns (string memory) {
* return _name.toStringWithFallback(_nameFallback);
* }
* }
* ```
*/
library ShortStrings {
// Used as an identifier for strings longer than 31 bytes.
bytes32 private constant _FALLBACK_SENTINEL = 0x00000000000000000000000000000000000000000000000000000000000000FF;
error StringTooLong(string str);
error InvalidShortString();
/**
* @dev Encode a string of at most 31 chars into a `ShortString`.
*
* This will trigger a `StringTooLong` error is the input string is too long.
*/
function toShortString(string memory str) internal pure returns (ShortString) {
bytes memory bstr = bytes(str);
if (bstr.length > 31) {
revert StringTooLong(str);
}
return ShortString.wrap(bytes32(uint256(bytes32(bstr)) | bstr.length));
}
/**
* @dev Decode a `ShortString` back to a "normal" string.
*/
function toString(ShortString sstr) internal pure returns (string memory) {
uint256 len = byteLength(sstr);
// using `new string(len)` would work locally but is not memory safe.
string memory str = new string(32);
/// @solidity memory-safe-assembly
assembly {
mstore(str, len)
mstore(add(str, 0x20), sstr)
}
return str;
}
/**
* @dev Return the length of a `ShortString`.
*/
function byteLength(ShortString sstr) internal pure returns (uint256) {
uint256 result = uint256(ShortString.unwrap(sstr)) & 0xFF;
if (result > 31) {
revert InvalidShortString();
}
return result;
}
/**
* @dev Encode a string into a `ShortString`, or write it to storage if it is too long.
*/
function toShortStringWithFallback(string memory value, string storage store) internal returns (ShortString) {
if (bytes(value).length < 32) {
return toShortString(value);
} else {
StorageSlot.getStringSlot(store).value = value;
return ShortString.wrap(_FALLBACK_SENTINEL);
}
}
/**
* @dev Decode a string that was encoded to `ShortString` or written to storage using {setWithFallback}.
*/
function toStringWithFallback(ShortString value, string storage store) internal pure returns (string memory) {
if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) {
return toString(value);
} else {
return store;
}
}
/**
* @dev Return the length of a string that was encoded to `ShortString` or written to storage using {setWithFallback}.
*
* WARNING: This will return the "byte length" of the string. This may not reflect the actual length in terms of
* actual characters as the UTF-8 encoding of a single character can span over multiple bytes.
*/
function byteLengthWithFallback(ShortString value, string storage store) internal view returns (uint256) {
if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) {
return byteLength(value);
} else {
return bytes(store).length;
}
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC5267.sol)
interface IERC5267 {
/**
* @dev MAY be emitted to signal that the domain could have changed.
*/
event EIP712DomainChanged();
/**
* @dev returns the fields and values that describe the domain separator used by this contract for EIP-712
* signature.
*/
function eip712Domain()
external
view
returns (
bytes1 fields,
string memory name,
string memory version,
uint256 chainId,
address verifyingContract,
bytes32 salt,
uint256[] memory extensions
);
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/EIP712.sol)
/**
* @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
*
* The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
* thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
* they need in their contracts using a combination of `abi.encode` and `keccak256`.
*
* This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
* scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
* ({_hashTypedDataV4}).
*
* The implementation of the domain separator was designed to be as efficient as possible while still properly updating
* the chain id to protect against replay attacks on an eventual fork of the chain.
*
* NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
* https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
*
* NOTE: In the upgradeable version of this contract, the cached values will correspond to the address, and the domain
* separator of the implementation contract. This will cause the `_domainSeparatorV4` function to always rebuild the
* separator from the immutable values, which is cheaper than accessing a cached version in cold storage.
*
* _Available since v3.4._
*
* @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
*/
abstract contract EIP712 is IERC5267 {
using ShortStrings for *;
bytes32 private constant _TYPE_HASH =
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
// Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
// invalidate the cached domain separator if the chain id changes.
bytes32 private immutable _cachedDomainSeparator;
uint256 private immutable _cachedChainId;
address private immutable _cachedThis;
bytes32 private immutable _hashedName;
bytes32 private immutable _hashedVersion;
ShortString private immutable _name;
ShortString private immutable _version;
string private _nameFallback;
string private _versionFallback;
/**
* @dev Initializes the domain separator and parameter caches.
*
* The meaning of `name` and `version` is specified in
* https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
*
* - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
* - `version`: the current major version of the signing domain.
*
* NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
* contract upgrade].
*/
constructor(string memory name, string memory version) {
_name = name.toShortStringWithFallback(_nameFallback);
_version = version.toShortStringWithFallback(_versionFallback);
_hashedName = keccak256(bytes(name));
_hashedVersion = keccak256(bytes(version));
_cachedChainId = block.chainid;
_cachedDomainSeparator = _buildDomainSeparator();
_cachedThis = address(this);
}
/**
* @dev Returns the domain separator for the current chain.
*/
function _domainSeparatorV4() internal view returns (bytes32) {
if (address(this) == _cachedThis && block.chainid == _cachedChainId) {
return _cachedDomainSeparator;
} else {
return _buildDomainSeparator();
}
}
function _buildDomainSeparator() private view returns (bytes32) {
return keccak256(abi.encode(_TYPE_HASH, _hashedName, _hashedVersion, block.chainid, address(this)));
}
/**
* @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
* function returns the hash of the fully encoded EIP712 message for this domain.
*
* This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
*
* ```solidity
* bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
* keccak256("Mail(address to,string contents)"),
* mailTo,
* keccak256(bytes(mailContents))
* )));
* address signer = ECDSA.recover(digest, signature);
* ```
*/
function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
}
/**
* @dev See {EIP-5267}.
*
* _Available since v4.9._
*/
function eip712Domain()
public
view
virtual
override
returns (
bytes1 fields,
string memory name,
string memory version,
uint256 chainId,
address verifyingContract,
bytes32 salt,
uint256[] memory extensions
)
{
return (
hex"0f", // 01111
_name.toStringWithFallback(_nameFallback),
_version.toStringWithFallback(_versionFallback),
block.chainid,
address(this),
bytes32(0),
new uint256[](0)
);
}
}
//
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
*/
library Counters {
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
unchecked {
counter._value += 1;
}
}
function decrement(Counter storage counter) internal {
uint256 value = counter._value;
require(value > 0, "Counter: decrement overflow");
unchecked {
counter._value = value - 1;
}
}
function reset(Counter storage counter) internal {
counter._value = 0;
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/ERC20Permit.sol)
/**
* @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*
* _Available since v3.4._
*/
abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {
using Counters for Counters.Counter;
mapping(address => Counters.Counter) private _nonces;
// solhint-disable-next-line var-name-mixedcase
bytes32 private constant _PERMIT_TYPEHASH =
keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
/**
* @dev In previous versions `_PERMIT_TYPEHASH` was declared as `immutable`.
* However, to ensure consistency with the upgradeable transpiler, we will continue
* to reserve a slot.
* @custom:oz-renamed-from _PERMIT_TYPEHASH
*/
// solhint-disable-next-line var-name-mixedcase
bytes32 private _PERMIT_TYPEHASH_DEPRECATED_SLOT;
/**
* @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
*
* It's a good idea to use the same `name` that is defined as the ERC20 token name.
*/
constructor(string memory name) EIP712(name, "1") {}
/**
* @dev See {IERC20Permit-permit}.
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public virtual override {
require(block.timestamp <= deadline, "ERC20Permit: expired deadline");
bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));
bytes32 hash = _hashTypedDataV4(structHash);
address signer = ECDSA.recover(hash, v, r, s);
require(signer == owner, "ERC20Permit: invalid signature");
_approve(owner, spender, value);
}
/**
* @dev See {IERC20Permit-nonces}.
*/
function nonces(address owner) public view virtual override returns (uint256) {
return _nonces[owner].current();
}
/**
* @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view override returns (bytes32) {
return _domainSeparatorV4();
}
/**
* @dev "Consume a nonce": return the current value and increment.
*
* _Available since v4.1._
*/
function _useNonce(address owner) internal virtual returns (uint256 current) {
Counters.Counter storage nonce = _nonces[owner];
current = nonce.current();
nonce.increment();
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (governance/utils/IVotes.sol)
/**
* @dev Common interface for {ERC20Votes}, {ERC721Votes}, and other {Votes}-enabled contracts.
*
* _Available since v4.5._
*/
interface IVotes {
/**
* @dev Emitted when an account changes their delegate.
*/
event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);
/**
* @dev Emitted when a token transfer or delegate change results in changes to a delegate's number of votes.
*/
event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);
/**
* @dev Returns the current amount of votes that `account` has.
*/
function getVotes(address account) external view returns (uint256);
/**
* @dev Returns the amount of votes that `account` had at a specific moment in the past. If the `clock()` is
* configured to use block numbers, this will return the value at the end of the corresponding block.
*/
function getPastVotes(address account, uint256 timepoint) external view returns (uint256);
/**
* @dev Returns the total supply of votes available at a specific moment in the past. If the `clock()` is
* configured to use block numbers, this will return the value at the end of the corresponding block.
*
* NOTE: This value is the sum of all available votes, which is not necessarily the sum of all delegated votes.
* Votes that have not been delegated are still part of total supply, even though they would not participate in a
* vote.
*/
function getPastTotalSupply(uint256 timepoint) external view returns (uint256);
/**
* @dev Returns the delegate that `account` has chosen.
*/
function delegates(address account) external view returns (address);
/**
* @dev Delegates votes from the sender to `delegatee`.
*/
function delegate(address delegatee) external;
/**
* @dev Delegates votes from signer to `delegatee`.
*/
function delegateBySig(address delegatee, uint256 nonce, uint256 expiry, uint8 v, bytes32 r, bytes32 s) external;
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC6372.sol)
interface IERC6372 {
/**
* @dev Clock used for flagging checkpoints. Can be overridden to implement timestamp based checkpoints (and voting).
*/
function clock() external view returns (uint48);
/**
* @dev Description of the clock
*/
// solhint-disable-next-line func-name-mixedcase
function CLOCK_MODE() external view returns (string memory);
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC5805.sol)
interface IERC5805 is IERC6372, IVotes {}
//
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SafeCast.sol)
// This file was procedurally generated from scripts/generate/templates/SafeCast.js.
/**
* @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
* checks.
*
* Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
* easily result in undesired exploitation or bugs, since developers usually
* assume that overflows raise errors. `SafeCast` restores this intuition by
* reverting the transaction when such an operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*
* Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
* all math on `uint256` and `int256` and then downcasting.
*/
library SafeCast {
/**
* @dev Returns the downcasted uint248 from uint256, reverting on
* overflow (when the input is greater than largest uint248).
*
* Counterpart to Solidity's `uint248` operator.
*
* Requirements:
*
* - input must fit into 248 bits
*
* _Available since v4.7._
*/
function toUint248(uint256 value) internal pure returns (uint248) {
require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits");
return uint248(value);
}
/**
* @dev Returns the downcasted uint240 from uint256, reverting on
* overflow (when the input is greater than largest uint240).
*
* Counterpart to Solidity's `uint240` operator.
*
* Requirements:
*
* - input must fit into 240 bits
*
* _Available since v4.7._
*/
function toUint240(uint256 value) internal pure returns (uint240) {
require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits");
return uint240(value);
}
/**
* @dev Returns the downcasted uint232 from uint256, reverting on
* overflow (when the input is greater than largest uint232).
*
* Counterpart to Solidity's `uint232` operator.
*
* Requirements:
*
* - input must fit into 232 bits
*
* _Available since v4.7._
*/
function toUint232(uint256 value) internal pure returns (uint232) {
require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits");
return uint232(value);
}
/**
* @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
*
* _Available since v4.2._
*/
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 uint216 from uint256, reverting on
* overflow (when the input is greater than largest uint216).
*
* Counterpart to Solidity's `uint216` operator.
*
* Requirements:
*
* - input must fit into 216 bits
*
* _Available since v4.7._
*/
function toUint216(uint256 value) internal pure returns (uint216) {
require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits");
return uint216(value);
}
/**
* @dev Returns the downcasted uint208 from uint256, reverting on
* overflow (when the input is greater than largest uint208).
*
* Counterpart to Solidity's `uint208` operator.
*
* Requirements:
*
* - input must fit into 208 bits
*
* _Available since v4.7._
*/
function toUint208(uint256 value) internal pure returns (uint208) {
require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits");
return uint208(value);
}
/**
* @dev Returns the downcasted uint200 from uint256, reverting on
* overflow (when the input is greater than largest uint200).
*
* Counterpart to Solidity's `uint200` operator.
*
* Requirements:
*
* - input must fit into 200 bits
*
* _Available since v4.7._
*/
function toUint200(uint256 value) internal pure returns (uint200) {
require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits");
return uint200(value);
}
/**
* @dev Returns the downcasted uint192 from uint256, reverting on
* overflow (when the input is greater than largest uint192).
*
* Counterpart to Solidity's `uint192` operator.
*
* Requirements:
*
* - input must fit into 192 bits
*
* _Available since v4.7._
*/
function toUint192(uint256 value) internal pure returns (uint192) {
require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits");
return uint192(value);
}
/**
* @dev Returns the downcasted uint184 from uint256, reverting on
* overflow (when the input is greater than largest uint184).
*
* Counterpart to Solidity's `uint184` operator.
*
* Requirements:
*
* - input must fit into 184 bits
*
* _Available since v4.7._
*/
function toUint184(uint256 value) internal pure returns (uint184) {
require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits");
return uint184(value);
}
/**
* @dev Returns the downcasted uint176 from uint256, reverting on
* overflow (when the input is greater than largest uint176).
*
* Counterpart to Solidity's `uint176` operator.
*
* Requirements:
*
* - input must fit into 176 bits
*
* _Available since v4.7._
*/
function toUint176(uint256 value) internal pure returns (uint176) {
require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits");
return uint176(value);
}
/**
* @dev Returns the downcasted uint168 from uint256, reverting on
* overflow (when the input is greater than largest uint168).
*
* Counterpart to Solidity's `uint168` operator.
*
* Requirements:
*
* - input must fit into 168 bits
*
* _Available since v4.7._
*/
function toUint168(uint256 value) internal pure returns (uint168) {
require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits");
return uint168(value);
}
/**
* @dev Returns the downcasted uint160 from uint256, reverting on
* overflow (when the input is greater than largest uint160).
*
* Counterpart to Solidity's `uint160` operator.
*
* Requirements:
*
* - input must fit into 160 bits
*
* _Available since v4.7._
*/
function toUint160(uint256 value) internal pure returns (uint160) {
require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits");
return uint160(value);
}
/**
* @dev Returns the downcasted uint152 from uint256, reverting on
* overflow (when the input is greater than largest uint152).
*
* Counterpart to Solidity's `uint152` operator.
*
* Requirements:
*
* - input must fit into 152 bits
*
* _Available since v4.7._
*/
function toUint152(uint256 value) internal pure returns (uint152) {
require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits");
return uint152(value);
}
/**
* @dev Returns the downcasted uint144 from uint256, reverting on
* overflow (when the input is greater than largest uint144).
*
* Counterpart to Solidity's `uint144` operator.
*
* Requirements:
*
* - input must fit into 144 bits
*
* _Available since v4.7._
*/
function toUint144(uint256 value) internal pure returns (uint144) {
require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits");
return uint144(value);
}
/**
* @dev Returns the downcasted uint136 from uint256, reverting on
* overflow (when the input is greater than largest uint136).
*
* Counterpart to Solidity's `uint136` operator.
*
* Requirements:
*
* - input must fit into 136 bits
*
* _Available since v4.7._
*/
function toUint136(uint256 value) internal pure returns (uint136) {
require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits");
return uint136(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
*
* _Available since v2.5._
*/
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 uint120 from uint256, reverting on
* overflow (when the input is greater than largest uint120).
*
* Counterpart to Solidity's `uint120` operator.
*
* Requirements:
*
* - input must fit into 120 bits
*
* _Available since v4.7._
*/
function toUint120(uint256 value) internal pure returns (uint120) {
require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits");
return uint120(value);
}
/**
* @dev Returns the downcasted uint112 from uint256, reverting on
* overflow (when the input is greater than largest uint112).
*
* Counterpart to Solidity's `uint112` operator.
*
* Requirements:
*
* - input must fit into 112 bits
*
* _Available since v4.7._
*/
function toUint112(uint256 value) internal pure returns (uint112) {
require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits");
return uint112(value);
}
/**
* @dev Returns the downcasted uint104 from uint256, reverting on
* overflow (when the input is greater than largest uint104).
*
* Counterpart to Solidity's `uint104` operator.
*
* Requirements:
*
* - input must fit into 104 bits
*
* _Available since v4.7._
*/
function toUint104(uint256 value) internal pure returns (uint104) {
require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits");
return uint104(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
*
* _Available since v4.2._
*/
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 uint88 from uint256, reverting on
* overflow (when the input is greater than largest uint88).
*
* Counterpart to Solidity's `uint88` operator.
*
* Requirements:
*
* - input must fit into 88 bits
*
* _Available since v4.7._
*/
function toUint88(uint256 value) internal pure returns (uint88) {
require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits");
return uint88(value);
}
/**
* @dev Returns the downcasted uint80 from uint256, reverting on
* overflow (when the input is greater than largest uint80).
*
* Counterpart to Solidity's `uint80` operator.
*
* Requirements:
*
* - input must fit into 80 bits
*
* _Available since v4.7._
*/
function toUint80(uint256 value) internal pure returns (uint80) {
require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits");
return uint80(value);
}
/**
* @dev Returns the downcasted uint72 from uint256, reverting on
* overflow (when the input is greater than largest uint72).
*
* Counterpart to Solidity's `uint72` operator.
*
* Requirements:
*
* - input must fit into 72 bits
*
* _Available since v4.7._
*/
function toUint72(uint256 value) internal pure returns (uint72) {
require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits");
return uint72(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
*
* _Available since v2.5._
*/
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 uint56 from uint256, reverting on
* overflow (when the input is greater than largest uint56).
*
* Counterpart to Solidity's `uint56` operator.
*
* Requirements:
*
* - input must fit into 56 bits
*
* _Available since v4.7._
*/
function toUint56(uint256 value) internal pure returns (uint56) {
require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits");
return uint56(value);
}
/**
* @dev Returns the downcasted uint48 from uint256, reverting on
* overflow (when the input is greater than largest uint48).
*
* Counterpart to Solidity's `uint48` operator.
*
* Requirements:
*
* - input must fit into 48 bits
*
* _Available since v4.7._
*/
function toUint48(uint256 value) internal pure returns (uint48) {
require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits");
return uint48(value);
}
/**
* @dev Returns the downcasted uint40 from uint256, reverting on
* overflow (when the input is greater than largest uint40).
*
* Counterpart to Solidity's `uint40` operator.
*
* Requirements:
*
* - input must fit into 40 bits
*
* _Available since v4.7._
*/
function toUint40(uint256 value) internal pure returns (uint40) {
require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits");
return uint40(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
*
* _Available since v2.5._
*/
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 uint24 from uint256, reverting on
* overflow (when the input is greater than largest uint24).
*
* Counterpart to Solidity's `uint24` operator.
*
* Requirements:
*
* - input must fit into 24 bits
*
* _Available since v4.7._
*/
function toUint24(uint256 value) internal pure returns (uint24) {
require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits");
return uint24(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
*
* _Available since v2.5._
*/
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
*
* _Available since v2.5._
*/
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.
*
* _Available since v3.0._
*/
function toUint256(int256 value) internal pure returns (uint256) {
require(value >= 0, "SafeCast: value must be positive");
return uint256(value);
}
/**
* @dev Returns the downcasted int248 from int256, reverting on
* overflow (when the input is less than smallest int248 or
* greater than largest int248).
*
* Counterpart to Solidity's `int248` operator.
*
* Requirements:
*
* - input must fit into 248 bits
*
* _Available since v4.7._
*/
function toInt248(int256 value) internal pure returns (int248 downcasted) {
downcasted = int248(value);
require(downcasted == value, "SafeCast: value doesn't fit in 248 bits");
}
/**
* @dev Returns the downcasted int240 from int256, reverting on
* overflow (when the input is less than smallest int240 or
* greater than largest int240).
*
* Counterpart to Solidity's `int240` operator.
*
* Requirements:
*
* - input must fit into 240 bits
*
* _Available since v4.7._
*/
function toInt240(int256 value) internal pure returns (int240 downcasted) {
downcasted = int240(value);
require(downcasted == value, "SafeCast: value doesn't fit in 240 bits");
}
/**
* @dev Returns the downcasted int232 from int256, reverting on
* overflow (when the input is less than smallest int232 or
* greater than largest int232).
*
* Counterpart to Solidity's `int232` operator.
*
* Requirements:
*
* - input must fit into 232 bits
*
* _Available since v4.7._
*/
function toInt232(int256 value) internal pure returns (int232 downcasted) {
downcasted = int232(value);
require(downcasted == value, "SafeCast: value doesn't fit in 232 bits");
}
/**
* @dev Returns the downcasted int224 from int256, reverting on
* overflow (when the input is less than smallest int224 or
* greater than largest int224).
*
* Counterpart to Solidity's `int224` operator.
*
* Requirements:
*
* - input must fit into 224 bits
*
* _Available since v4.7._
*/
function toInt224(int256 value) internal pure returns (int224 downcasted) {
downcasted = int224(value);
require(downcasted == value, "SafeCast: value doesn't fit in 224 bits");
}
/**
* @dev Returns the downcasted int216 from int256, reverting on
* overflow (when the input is less than smallest int216 or
* greater than largest int216).
*
* Counterpart to Solidity's `int216` operator.
*
* Requirements:
*
* - input must fit into 216 bits
*
* _Available since v4.7._
*/
function toInt216(int256 value) internal pure returns (int216 downcasted) {
downcasted = int216(value);
require(downcasted == value, "SafeCast: value doesn't fit in 216 bits");
}
/**
* @dev Returns the downcasted int208 from int256, reverting on
* overflow (when the input is less than smallest int208 or
* greater than largest int208).
*
* Counterpart to Solidity's `int208` operator.
*
* Requirements:
*
* - input must fit into 208 bits
*
* _Available since v4.7._
*/
function toInt208(int256 value) internal pure returns (int208 downcasted) {
downcasted = int208(value);
require(downcasted == value, "SafeCast: value doesn't fit in 208 bits");
}
/**
* @dev Returns the downcasted int200 from int256, reverting on
* overflow (when the input is less than smallest int200 or
* greater than largest int200).
*
* Counterpart to Solidity's `int200` operator.
*
* Requirements:
*
* - input must fit into 200 bits
*
* _Available since v4.7._
*/
function toInt200(int256 value) internal pure returns (int200 downcasted) {
downcasted = int200(value);
require(downcasted == value, "SafeCast: value doesn't fit in 200 bits");
}
/**
* @dev Returns the downcasted int192 from int256, reverting on
* overflow (when the input is less than smallest int192 or
* greater than largest int192).
*
* Counterpart to Solidity's `int192` operator.
*
* Requirements:
*
* - input must fit into 192 bits
*
* _Available since v4.7._
*/
function toInt192(int256 value) internal pure returns (int192 downcasted) {
downcasted = int192(value);
require(downcasted == value, "SafeCast: value doesn't fit in 192 bits");
}
/**
* @dev Returns the downcasted int184 from int256, reverting on
* overflow (when the input is less than smallest int184 or
* greater than largest int184).
*
* Counterpart to Solidity's `int184` operator.
*
* Requirements:
*
* - input must fit into 184 bits
*
* _Available since v4.7._
*/
function toInt184(int256 value) internal pure returns (int184 downcasted) {
downcasted = int184(value);
require(downcasted == value, "SafeCast: value doesn't fit in 184 bits");
}
/**
* @dev Returns the downcasted int176 from int256, reverting on
* overflow (when the input is less than smallest int176 or
* greater than largest int176).
*
* Counterpart to Solidity's `int176` operator.
*
* Requirements:
*
* - input must fit into 176 bits
*
* _Available since v4.7._
*/
function toInt176(int256 value) internal pure returns (int176 downcasted) {
downcasted = int176(value);
require(downcasted == value, "SafeCast: value doesn't fit in 176 bits");
}
/**
* @dev Returns the downcasted int168 from int256, reverting on
* overflow (when the input is less than smallest int168 or
* greater than largest int168).
*
* Counterpart to Solidity's `int168` operator.
*
* Requirements:
*
* - input must fit into 168 bits
*
* _Available since v4.7._
*/
function toInt168(int256 value) internal pure returns (int168 downcasted) {
downcasted = int168(value);
require(downcasted == value, "SafeCast: value doesn't fit in 168 bits");
}
/**
* @dev Returns the downcasted int160 from int256, reverting on
* overflow (when the input is less than smallest int160 or
* greater than largest int160).
*
* Counterpart to Solidity's `int160` operator.
*
* Requirements:
*
* - input must fit into 160 bits
*
* _Available since v4.7._
*/
function toInt160(int256 value) internal pure returns (int160 downcasted) {
downcasted = int160(value);
require(downcasted == value, "SafeCast: value doesn't fit in 160 bits");
}
/**
* @dev Returns the downcasted int152 from int256, reverting on
* overflow (when the input is less than smallest int152 or
* greater than largest int152).
*
* Counterpart to Solidity's `int152` operator.
*
* Requirements:
*
* - input must fit into 152 bits
*
* _Available since v4.7._
*/
function toInt152(int256 value) internal pure returns (int152 downcasted) {
downcasted = int152(value);
require(downcasted == value, "SafeCast: value doesn't fit in 152 bits");
}
/**
* @dev Returns the downcasted int144 from int256, reverting on
* overflow (when the input is less than smallest int144 or
* greater than largest int144).
*
* Counterpart to Solidity's `int144` operator.
*
* Requirements:
*
* - input must fit into 144 bits
*
* _Available since v4.7._
*/
function toInt144(int256 value) internal pure returns (int144 downcasted) {
downcasted = int144(value);
require(downcasted == value, "SafeCast: value doesn't fit in 144 bits");
}
/**
* @dev Returns the downcasted int136 from int256, reverting on
* overflow (when the input is less than smallest int136 or
* greater than largest int136).
*
* Counterpart to Solidity's `int136` operator.
*
* Requirements:
*
* - input must fit into 136 bits
*
* _Available since v4.7._
*/
function toInt136(int256 value) internal pure returns (int136 downcasted) {
downcasted = int136(value);
require(downcasted == value, "SafeCast: value doesn't fit in 136 bits");
}
/**
* @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 downcasted) {
downcasted = int128(value);
require(downcasted == value, "SafeCast: value doesn't fit in 128 bits");
}
/**
* @dev Returns the downcasted int120 from int256, reverting on
* overflow (when the input is less than smallest int120 or
* greater than largest int120).
*
* Counterpart to Solidity's `int120` operator.
*
* Requirements:
*
* - input must fit into 120 bits
*
* _Available since v4.7._
*/
function toInt120(int256 value) internal pure returns (int120 downcasted) {
downcasted = int120(value);
require(downcasted == value, "SafeCast: value doesn't fit in 120 bits");
}
/**
* @dev Returns the downcasted int112 from int256, reverting on
* overflow (when the input is less than smallest int112 or
* greater than largest int112).
*
* Counterpart to Solidity's `int112` operator.
*
* Requirements:
*
* - input must fit into 112 bits
*
* _Available since v4.7._
*/
function toInt112(int256 value) internal pure returns (int112 downcasted) {
downcasted = int112(value);
require(downcasted == value, "SafeCast: value doesn't fit in 112 bits");
}
/**
* @dev Returns the downcasted int104 from int256, reverting on
* overflow (when the input is less than smallest int104 or
* greater than largest int104).
*
* Counterpart to Solidity's `int104` operator.
*
* Requirements:
*
* - input must fit into 104 bits
*
* _Available since v4.7._
*/
function toInt104(int256 value) internal pure returns (int104 downcasted) {
downcasted = int104(value);
require(downcasted == value, "SafeCast: value doesn't fit in 104 bits");
}
/**
* @dev Returns the downcasted int96 from int256, reverting on
* overflow (when the input is less than smallest int96 or
* greater than largest int96).
*
* Counterpart to Solidity's `int96` operator.
*
* Requirements:
*
* - input must fit into 96 bits
*
* _Available since v4.7._
*/
function toInt96(int256 value) internal pure returns (int96 downcasted) {
downcasted = int96(value);
require(downcasted == value, "SafeCast: value doesn't fit in 96 bits");
}
/**
* @dev Returns the downcasted int88 from int256, reverting on
* overflow (when the input is less than smallest int88 or
* greater than largest int88).
*
* Counterpart to Solidity's `int88` operator.
*
* Requirements:
*
* - input must fit into 88 bits
*
* _Available since v4.7._
*/
function toInt88(int256 value) internal pure returns (int88 downcasted) {
downcasted = int88(value);
require(downcasted == value, "SafeCast: value doesn't fit in 88 bits");
}
/**
* @dev Returns the downcasted int80 from int256, reverting on
* overflow (when the input is less than smallest int80 or
* greater than largest int80).
*
* Counterpart to Solidity's `int80` operator.
*
* Requirements:
*
* - input must fit into 80 bits
*
* _Available since v4.7._
*/
function toInt80(int256 value) internal pure returns (int80 downcasted) {
downcasted = int80(value);
require(downcasted == value, "SafeCast: value doesn't fit in 80 bits");
}
/**
* @dev Returns the downcasted int72 from int256, reverting on
* overflow (when the input is less than smallest int72 or
* greater than largest int72).
*
* Counterpart to Solidity's `int72` operator.
*
* Requirements:
*
* - input must fit into 72 bits
*
* _Available since v4.7._
*/
function toInt72(int256 value) internal pure returns (int72 downcasted) {
downcasted = int72(value);
require(downcasted == value, "SafeCast: value doesn't fit in 72 bits");
}
/**
* @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 downcasted) {
downcasted = int64(value);
require(downcasted == value, "SafeCast: value doesn't fit in 64 bits");
}
/**
* @dev Returns the downcasted int56 from int256, reverting on
* overflow (when the input is less than smallest int56 or
* greater than largest int56).
*
* Counterpart to Solidity's `int56` operator.
*
* Requirements:
*
* - input must fit into 56 bits
*
* _Available since v4.7._
*/
function toInt56(int256 value) internal pure returns (int56 downcasted) {
downcasted = int56(value);
require(downcasted == value, "SafeCast: value doesn't fit in 56 bits");
}
/**
* @dev Returns the downcasted int48 from int256, reverting on
* overflow (when the input is less than smallest int48 or
* greater than largest int48).
*
* Counterpart to Solidity's `int48` operator.
*
* Requirements:
*
* - input must fit into 48 bits
*
* _Available since v4.7._
*/
function toInt48(int256 value) internal pure returns (int48 downcasted) {
downcasted = int48(value);
require(downcasted == value, "SafeCast: value doesn't fit in 48 bits");
}
/**
* @dev Returns the downcasted int40 from int256, reverting on
* overflow (when the input is less than smallest int40 or
* greater than largest int40).
*
* Counterpart to Solidity's `int40` operator.
*
* Requirements:
*
* - input must fit into 40 bits
*
* _Available since v4.7._
*/
function toInt40(int256 value) internal pure returns (int40 downcasted) {
downcasted = int40(value);
require(downcasted == value, "SafeCast: value doesn't fit in 40 bits");
}
/**
* @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 downcasted) {
downcasted = int32(value);
require(downcasted == value, "SafeCast: value doesn't fit in 32 bits");
}
/**
* @dev Returns the downcasted int24 from int256, reverting on
* overflow (when the input is less than smallest int24 or
* greater than largest int24).
*
* Counterpart to Solidity's `int24` operator.
*
* Requirements:
*
* - input must fit into 24 bits
*
* _Available since v4.7._
*/
function toInt24(int256 value) internal pure returns (int24 downcasted) {
downcasted = int24(value);
require(downcasted == value, "SafeCast: value doesn't fit in 24 bits");
}
/**
* @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 downcasted) {
downcasted = int16(value);
require(downcasted == value, "SafeCast: value doesn't fit in 16 bits");
}
/**
* @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 downcasted) {
downcasted = int8(value);
require(downcasted == value, "SafeCast: value doesn't fit in 8 bits");
}
/**
* @dev Converts an unsigned uint256 into a signed int256.
*
* Requirements:
*
* - input must be less than or equal to maxInt256.
*
* _Available since v3.0._
*/
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);
}
}
//
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/ERC20Votes.sol)
/**
* @dev Extension of ERC20 to support Compound-like voting and delegation. This version is more generic than Compound's,
* and supports token supply up to 2^224^ - 1, while COMP is limited to 2^96^ - 1.
*
* NOTE: If exact COMP compatibility is required, use the {ERC20VotesComp} variant of this module.
*
* This extension keeps a history (checkpoints) of each account's vote power. Vote power can be delegated either
* by calling the {delegate} function directly, or by providing a signature to be used with {delegateBySig}. Voting
* power can be queried through the public accessors {getVotes} and {getPastVotes}.
*
* By default, token balance does not account for voting power. This makes transfers cheaper. The downside is that it
* requires users to delegate to themselves in order to activate checkpoints and have their voting power tracked.
*
* _Available since v4.2._
*/
abstract contract ERC20Votes is ERC20Permit, IERC5805 {
struct Checkpoint {
uint32 fromBlock;
uint224 votes;
}
bytes32 private constant _DELEGATION_TYPEHASH =
keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
mapping(address => address) private _delegates;
mapping(address => Checkpoint[]) private _checkpoints;
Checkpoint[] private _totalSupplyCheckpoints;
/**
* @dev Clock used for flagging checkpoints. Can be overridden to implement timestamp based checkpoints (and voting).
*/
function clock() public view virtual override returns (uint48) {
return SafeCast.toUint48(block.number);
}
/**
* @dev Description of the clock
*/
// solhint-disable-next-line func-name-mixedcase
function CLOCK_MODE() public view virtual override returns (string memory) {
// Check that the clock was not modified
require(clock() == block.number, "ERC20Votes: broken clock mode");
return "mode=blocknumber&from=default";
}
/**
* @dev Get the `pos`-th checkpoint for `account`.
*/
function checkpoints(address account, uint32 pos) public view virtual returns (Checkpoint memory) {
return _checkpoints[account][pos];
}
/**
* @dev Get number of checkpoints for `account`.
*/
function numCheckpoints(address account) public view virtual returns (uint32) {
return SafeCast.toUint32(_checkpoints[account].length);
}
/**
* @dev Get the address `account` is currently delegating to.
*/
function delegates(address account) public view virtual override returns (address) {
return _delegates[account];
}
/**
* @dev Gets the current votes balance for `account`
*/
function getVotes(address account) public view virtual override returns (uint256) {
uint256 pos = _checkpoints[account].length;
unchecked {
return pos == 0 ? 0 : _checkpoints[account][pos - 1].votes;
}
}
/**
* @dev Retrieve the number of votes for `account` at the end of `timepoint`.
*
* Requirements:
*
* - `timepoint` must be in the past
*/
function getPastVotes(address account, uint256 timepoint) public view virtual override returns (uint256) {
require(timepoint < clock(), "ERC20Votes: future lookup");
return _checkpointsLookup(_checkpoints[account], timepoint);
}
/**
* @dev Retrieve the `totalSupply` at the end of `timepoint`. Note, this value is the sum of all balances.
* It is NOT the sum of all the delegated votes!
*
* Requirements:
*
* - `timepoint` must be in the past
*/
function getPastTotalSupply(uint256 timepoint) public view virtual override returns (uint256) {
require(timepoint < clock(), "ERC20Votes: future lookup");
return _checkpointsLookup(_totalSupplyCheckpoints, timepoint);
}
/**
* @dev Lookup a value in a list of (sorted) checkpoints.
*/
function _checkpointsLookup(Checkpoint[] storage ckpts, uint256 timepoint) private view returns (uint256) {
// We run a binary search to look for the last (most recent) checkpoint taken before (or at) `timepoint`.
//
// Initially we check if the block is recent to narrow the search range.
// During the loop, the index of the wanted checkpoint remains in the range [low-1, high).
// With each iteration, either `low` or `high` is moved towards the middle of the range to maintain the invariant.
// - If the middle checkpoint is after `timepoint`, we look in [low, mid)
// - If the middle checkpoint is before or equal to `timepoint`, we look in [mid+1, high)
// Once we reach a single value (when low == high), we've found the right checkpoint at the index high-1, if not
// out of bounds (in which case we're looking too far in the past and the result is 0).
// Note that if the latest checkpoint available is exactly for `timepoint`, we end up with an index that is
// past the end of the array, so we technically don't find a checkpoint after `timepoint`, but it works out
// the same.
uint256 length = ckpts.length;
uint256 low = 0;
uint256 high = length;
if (length > 5) {
uint256 mid = length - Math.sqrt(length);
if (_unsafeAccess(ckpts, mid).fromBlock > timepoint) {
high = mid;
} else {
low = mid + 1;
}
}
while (low < high) {
uint256 mid = Math.average(low, high);
if (_unsafeAccess(ckpts, mid).fromBlock > timepoint) {
high = mid;
} else {
low = mid + 1;
}
}
unchecked {
return high == 0 ? 0 : _unsafeAccess(ckpts, high - 1).votes;
}
}
/**
* @dev Delegate votes from the sender to `delegatee`.
*/
function delegate(address delegatee) public virtual override {
_delegate(_msgSender(), delegatee);
}
/**
* @dev Delegates votes from signer to `delegatee`
*/
function delegateBySig(
address delegatee,
uint256 nonce,
uint256 expiry,
uint8 v,
bytes32 r,
bytes32 s
) public virtual override {
require(block.timestamp <= expiry, "ERC20Votes: signature expired");
address signer = ECDSA.recover(
_hashTypedDataV4(keccak256(abi.encode(_DELEGATION_TYPEHASH, delegatee, nonce, expiry))),
v,
r,
s
);
require(nonce == _useNonce(signer), "ERC20Votes: invalid nonce");
_delegate(signer, delegatee);
}
/**
* @dev Maximum token supply. Defaults to `type(uint224).max` (2^224^ - 1).
*/
function _maxSupply() internal view virtual returns (uint224) {
return type(uint224).max;
}
/**
* @dev Snapshots the totalSupply after it has been increased.
*/
function _mint(address account, uint256 amount) internal virtual override {
super._mint(account, amount);
require(totalSupply() <= _maxSupply(), "ERC20Votes: total supply risks overflowing votes");
_writeCheckpoint(_totalSupplyCheckpoints, _add, amount);
}
/**
* @dev Snapshots the totalSupply after it has been decreased.
*/
function _burn(address account, uint256 amount) internal virtual override {
super._burn(account, amount);
_writeCheckpoint(_totalSupplyCheckpoints, _subtract, amount);
}
/**
* @dev Move voting power when tokens are transferred.
*
* Emits a {IVotes-DelegateVotesChanged} event.
*/
function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual override {
super._afterTokenTransfer(from, to, amount);
_moveVotingPower(delegates(from), delegates(to), amount);
}
/**
* @dev Change delegation for `delegator` to `delegatee`.
*
* Emits events {IVotes-DelegateChanged} and {IVotes-DelegateVotesChanged}.
*/
function _delegate(address delegator, address delegatee) internal virtual {
address currentDelegate = delegates(delegator);
uint256 delegatorBalance = balanceOf(delegator);
_delegates[delegator] = delegatee;
emit DelegateChanged(delegator, currentDelegate, delegatee);
_moveVotingPower(currentDelegate, delegatee, delegatorBalance);
}
function _moveVotingPower(address src, address dst, uint256 amount) private {
if (src != dst && amount > 0) {
if (src != address(0)) {
(uint256 oldWeight, uint256 newWeight) = _writeCheckpoint(_checkpoints[src], _subtract, amount);
emit DelegateVotesChanged(src, oldWeight, newWeight);
}
if (dst != address(0)) {
(uint256 oldWeight, uint256 newWeight) = _writeCheckpoint(_checkpoints[dst], _add, amount);
emit DelegateVotesChanged(dst, oldWeight, newWeight);
}
}
}
function _writeCheckpoint(
Checkpoint[] storage ckpts,
function(uint256, uint256) view returns (uint256) op,
uint256 delta
) private returns (uint256 oldWeight, uint256 newWeight) {
uint256 pos = ckpts.length;
unchecked {
Checkpoint memory oldCkpt = pos == 0 ? Checkpoint(0, 0) : _unsafeAccess(ckpts, pos - 1);
oldWeight = oldCkpt.votes;
newWeight = op(oldWeight, delta);
if (pos > 0 && oldCkpt.fromBlock == clock()) {
_unsafeAccess(ckpts, pos - 1).votes = SafeCast.toUint224(newWeight);
} else {
ckpts.push(Checkpoint({fromBlock: SafeCast.toUint32(clock()), votes: SafeCast.toUint224(newWeight)}));
}
}
}
function _add(uint256 a, uint256 b) private pure returns (uint256) {
return a + b;
}
function _subtract(uint256 a, uint256 b) private pure returns (uint256) {
return a - b;
}
/**
* @dev Access an element of the array without performing bounds check. The position is assumed to be within bounds.
*/
function _unsafeAccess(Checkpoint[] storage ckpts, uint256 pos) private pure returns (Checkpoint storage result) {
assembly {
mstore(0, ckpts.slot)
result.slot := add(keccak256(0, 0x20), pos)
}
}
}
//
abstract contract ERC20Decimals is ERC20 {
uint8 private immutable _decimals;
constructor(uint8 decimals_) {
_decimals = decimals_;
}
function decimals() public view virtual override returns (uint8) {
return _decimals;
}
}
abstract contract ERC20VotesDecimals is ERC20Votes {
uint8 private immutable _decimals;
constructor(uint8 decimals_) {
_decimals = decimals_;
}
function decimals() public view virtual override returns (uint8) {
return _decimals;
}
function _afterTokenTransfer(
address _from,
address _to,
uint256 _amount
) internal virtual override {
ERC20Votes._afterTokenTransfer(_from, _to, _amount);
}
}
//
struct ShareHolder {
uint256 shares;
uint256 rewardDebt;
uint256 claimed;
uint256 pending;
}
struct TaxInfo {
uint64 charity;
uint64 autoLiquidity;
uint64 marketing;
uint64 reflection;
}
struct DividendConstructorArgs {
address uniswapFactory;
IUniswapV2Router02 uniswapV2Router;
address mainLPToken;
address charityAddress;
address marketingAddress;
address autoLiquidityAddress;
TaxInfo transferTaxInfo;
TaxInfo buyTaxInfo;
TaxInfo sellTaxInfo;
bool swapTaxes;
uint256 minShareForRewards;
bool sameTokenForRewards;
}
contract ERC20TempHolder {
address immutable owner;
constructor() {
owner = msg.sender;
}
function transfer(address token, address to, uint256 amount) external {
require(msg.sender == owner, "Only owner");
IERC20(token).transfer(to, amount);
}
}
abstract contract DividendsTokenCustom is ERC20Decimals, Ownable {
/* Universal distributor */
using SafeMath for uint256;
using SafeERC20 for IERC20;
uint256 public minShareForRewards;
uint256 public maxAutoProcessGas = 500000;
bool public autoDistribute = true;
uint256 public accPerShare; // Accumulated per share, times 1e36.
uint256 public totalShares; // total number of shares
uint256 public totalClaimed; // total amount claimed
uint256 public totalRewardsDebt; // total amount claimed
// use getShare-holderInfo function to get this data
mapping(address => ShareHolder) shareHolders;
address[] public allShareHolders;
mapping(address => uint256) public indexOfShareHolders;
uint256 private _lastProccessedIndex = 1;
mapping(address => bool) public excludedFromRewards;
// events
event Claimed(address indexed claimer, uint256 indexed amount);
event RewardsAdded(uint256 indexed amount);
event ShareUpdated(
address indexed shareHolder,
uint256 indexed sharesAmount
);
event IncludedInRewards(address indexed shareHolder);
event ExcludedFromRewards(address indexed shareHolder);
address public immutable weth;
address public immutable rewardToken;
bool immutable isWethRewardToken;
/** */
uint256 public constant PERCENT_DENOMINATOR = 1000;
uint256 public constant MAX_TAX = 200; // 20%
IUniswapV2Router02 public immutable uniswapV2Router;
address public immutable uniswapV2Pair;
address public immutable wrappedNativeAddress;
address public immutable mainLPToken;
ERC20TempHolder public immutable tempHolder = new ERC20TempHolder();
bool public immutable sameTokenForRewards;
address public charityAddress;
address public marketingAddress;
address public autoLiquidityAddress;
TaxInfo public transferTax;
TaxInfo public buyTax;
TaxInfo public sellTax;
bool public isTaxActive;
bool public swapAndLiquifyActive = true;
uint256 public minTokensBeforeSwap; // 1 token
mapping(address => bool) public isExcludedFromFee;
mapping(address => bool) public isPair;
uint256 public charityReserves;
uint256 public marketingReserves;
uint256 public autoLiquidityReserves;
uint256 public reflectionReserves;
bool public swapTaxes;
function setSwapTaxes(bool _swapTaxes) external onlyOwner {
swapTaxes = _swapTaxes;
}
constructor(DividendConstructorArgs memory _args) {
minTokensBeforeSwap = (1 * 10) ** (decimals() - 1);
uniswapV2Router = _args.uniswapV2Router;
address __weth = _args.uniswapV2Router.WETH();
wrappedNativeAddress = __weth;
uniswapV2Pair = IUniswapV2Factory(_args.uniswapFactory).createPair(
address(this),
_args.mainLPToken
);
isPair[uniswapV2Pair] = true;
mainLPToken = _args.mainLPToken;
allShareHolders.push(address(0)); // use the index zero for address zero
weth = __weth;
rewardToken = _args.sameTokenForRewards
? address(this)
: _args.mainLPToken;
isWethRewardToken =
!_args.sameTokenForRewards &&
__weth == _args.mainLPToken;
charityAddress = _args.charityAddress;
marketingAddress = _args.marketingAddress;
autoLiquidityAddress = _args.autoLiquidityAddress;
isExcludedFromFee[owner()] = true;
isExcludedFromFee[address(this)] = true;
isExcludedFromFee[charityAddress] = true;
isExcludedFromFee[marketingAddress] = true;
isExcludedFromFee[address(tempHolder)] = true;
transferTax = _args.transferTaxInfo;
buyTax = _args.buyTaxInfo;
sellTax = _args.sellTaxInfo;
excludedFromRewards[uniswapV2Pair] = true;
excludedFromRewards[address(this)] = true;
excludedFromRewards[address(_args.uniswapV2Router)] = true;
excludedFromRewards[address(tempHolder)] = true;
excludedFromRewards[owner()] = true;
// approve max uint for router
_approve(address(this), address(uniswapV2Router), type(uint256).max);
// approve max int mainLPToken for router
IERC20(_args.mainLPToken).approve(
address(uniswapV2Router),
type(uint256).max
);
swapTaxes = _args.swapTaxes;
minShareForRewards = _args.minShareForRewards;
sameTokenForRewards = _args.sameTokenForRewards;
}
function transfer(
address recipient,
uint256 amount
) public virtual override returns (bool) {
_customTransfer(_msgSender(), recipient, amount);
return true;
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
require(
amount <= allowance(sender, _msgSender()),
"Transfer amount exceeds allowance"
);
_customTransfer(sender, recipient, amount);
unchecked {
_approve(
sender,
_msgSender(),
allowance(sender, _msgSender()) - amount
);
}
return true;
}
bool inSwap = false;
function _customTransfer(
address from,
address to,
uint256 amount
) internal virtual {
if (from == address(this) || to == address(this)) {
_transfer(from, to, amount);
return;
}
// TODO: implement taxes
if (from != uniswapV2Pair && swapAndLiquifyActive) {
processReserves();
}
// if excluded then do normal transfer
if (
!isTaxActive ||
inSwap ||
isExcludedFromFee[from] ||
isExcludedFromFee[to] ||
amount == 0
) {
_transfer(from, to, amount);
return;
}
// if not excluded then apply tax
TaxInfo memory taxInfo;
uint64 totalTax;
uint256 taxAmount;
if (!isPair[from] && !isPair[to]) {
taxInfo = transferTax;
} else if (isPair[from] && !isPair[to]) {
taxInfo = buyTax;
} else {
taxInfo = sellTax;
}
unchecked {
totalTax =
taxInfo.charity +
taxInfo.autoLiquidity +
taxInfo.marketing +
taxInfo.reflection;
taxAmount = (amount * totalTax) / PERCENT_DENOMINATOR;
}
if (taxAmount > 0) _transfer(from, address(this), taxAmount);
_transfer(from, to, amount - taxAmount);
// prevent div by zero
if (totalTax == 0) return;
unchecked {
// charity
charityReserves += (taxAmount * taxInfo.charity) / totalTax;
// auto liquidity
autoLiquidityReserves +=
(taxAmount * taxInfo.autoLiquidity) /
totalTax;
// marketing
marketingReserves += (taxAmount * taxInfo.marketing) / totalTax;
// reflection
reflectionReserves += (taxAmount * taxInfo.reflection) / totalTax;
}
}
// setters
function setCharityAddress(address _charityAddress) external onlyOwner {
charityAddress = _charityAddress;
}
function setMarketingAddress(address _marketingAddress) external onlyOwner {
marketingAddress = _marketingAddress;
}
function setAutoLiquidityAddress(
address _autoLiquidityAddress
) external onlyOwner {
autoLiquidityAddress = _autoLiquidityAddress;
}
function setTransferTax(
uint64 _charity,
uint64 _autoLiquidity,
uint64 _marketing,
uint64 _holdersRewards
) external onlyOwner {
require(
_charity + _autoLiquidity + _marketing + _holdersRewards <= MAX_TAX,
"Transfer tax too high"
);
transferTax = TaxInfo(
_charity,
_autoLiquidity,
_marketing,
_holdersRewards
);
}
function setBuyTax(
uint64 _charity,
uint64 _autoLiquidity,
uint64 _marketing,
uint64 _holdersRewards
) external onlyOwner {
require(
_charity + _autoLiquidity + _marketing + _holdersRewards <= MAX_TAX,
"Buy tax too high"
);
buyTax = TaxInfo(_charity, _autoLiquidity, _marketing, _holdersRewards);
}
function setSellTax(
uint64 _charity,
uint64 _autoLiquidity,
uint64 _marketing,
uint64 _holdersRewards
) external onlyOwner {
require(
_charity + _autoLiquidity + _marketing + _holdersRewards <= MAX_TAX,
"Sell tax too high"
);
sellTax = TaxInfo(
_charity,
_autoLiquidity,
_marketing,
_holdersRewards
);
}
function setExcludedFromFee(
address account,
bool excluded
) external onlyOwner {
isExcludedFromFee[account] = excluded;
}
function setPair(address pair, bool value) external onlyOwner {
require(pair != uniswapV2Pair, "Cannot change pair");
isPair[pair] = value;
}
function setTaxActive(bool value) external onlyOwner {
isTaxActive = value;
}
function setSwapAndLiquifyActive(
bool _swapAndLiquifyActive
) external onlyOwner {
swapAndLiquifyActive = _swapAndLiquifyActive;
}
function setMinTokensBeforeSwap(
uint256 _minTokensBeforeSwap
) external onlyOwner {
minTokensBeforeSwap = _minTokensBeforeSwap;
}
function processReserves() public {
if (inSwap) return;
inSwap = true;
if (
charityReserves > minTokensBeforeSwap &&
charityAddress != address(0)
) {
if (swapTaxes) {
if (mainLPToken == wrappedNativeAddress) {
swapForETH(charityReserves, charityAddress);
} else {
swapForERC20(charityReserves, charityAddress);
}
} else _transfer(address(this), charityAddress, charityReserves);
delete charityReserves;
}
if (marketingReserves > minTokensBeforeSwap) {
if (swapTaxes) {
if (mainLPToken == wrappedNativeAddress) {
swapForETH(marketingReserves, marketingAddress);
} else {
swapForERC20(marketingReserves, marketingAddress);
}
} else
_transfer(address(this), marketingAddress, marketingReserves);
delete marketingReserves;
}
if (reflectionReserves > minTokensBeforeSwap && !sameTokenForRewards) {
if (mainLPToken == wrappedNativeAddress) {
uint256 initialBalance = address(this).balance;
swapForETH(reflectionReserves, address(this));
uint256 balanceAfter = address(this).balance - initialBalance;
_updateGlobalShares(balanceAfter);
} else {
swapForERC20(reflectionReserves, address(tempHolder));
uint256 balanceAfter = IERC20(mainLPToken).balanceOf(
address(tempHolder)
);
tempHolder.transfer(mainLPToken, address(this), balanceAfter);
_updateGlobalShares(balanceAfter);
}
delete reflectionReserves;
} else if (sameTokenForRewards) {
_updateGlobalShares(reflectionReserves);
delete reflectionReserves;
}
if (
autoLiquidityReserves > minTokensBeforeSwap &&
autoLiquidityAddress != address(0)
) {
autoLiquidityReserves = swapAndLiquify(autoLiquidityReserves);
}
inSwap = false;
}
function swapAndLiquify(uint256 _amount) internal returns (uint256) {
uint256 half = _amount / 2;
uint256 otherHalf = _amount - half;
uint256 leftOver;
if (mainLPToken == wrappedNativeAddress) {
uint256 initialBalance = address(this).balance;
swapForETH(half, address(this));
uint256 newBalance = address(this).balance - initialBalance;
(uint amountToken, , ) = addLiquidityETH(otherHalf, newBalance);
leftOver = otherHalf - amountToken;
} else {
swapForERC20(half, address(tempHolder));
uint256 newBalance = IERC20(mainLPToken).balanceOf(
address(tempHolder)
);
tempHolder.transfer(mainLPToken, address(this), newBalance);
(uint amountToken, , ) = addLiquidityERC20(otherHalf, newBalance);
leftOver = otherHalf - amountToken;
}
return leftOver;
}
function addLiquidityETH(
uint256 _tokenAmount,
uint256 _NativeAmount
) private returns (uint, uint, uint) {
return
uniswapV2Router.addLiquidityETH{value: _NativeAmount}(
address(this),
_tokenAmount,
0,
0,
autoLiquidityAddress,
block.timestamp
);
}
function addLiquidityERC20(
uint256 _tokenAmount,
uint256 _counterPartAmount
) private returns (uint, uint, uint) {
return
uniswapV2Router.addLiquidity(
address(this),
mainLPToken,
_tokenAmount,
_counterPartAmount,
0,
0,
autoLiquidityAddress,
block.timestamp
);
}
function swapForETH(uint256 _amount, address _to) internal {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = wrappedNativeAddress;
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
_amount,
0,
path,
_to,
block.timestamp
);
}
function swapForERC20(uint256 _amount, address _to) internal {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = mainLPToken;
uniswapV2Router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
_amount,
0,
path,
_to,
block.timestamp
);
}
receive() external payable {
// only receive from router
require(msg.sender == address(uniswapV2Router), "Invalid sender");
}
function _afterTokenTransfer(
address from_,
address to_,
uint256
) internal virtual override {
_updateShare(from_);
_updateShare(to_);
if (!inSwap) _massProcess();
}
function _massProcess() internal {
if (autoDistribute)
batchProcessClaims(
gasleft() > maxAutoProcessGas
? maxAutoProcessGas
: (gasleft() * 80) / 100
);
}
function _updateShare(address wallet) internal {
if (!excludedFromRewards[wallet])
_setShare(
wallet,
balanceOf(wallet) > minShareForRewards ? balanceOf(wallet) : 0
);
}
function includeInRewards(
address shareHolderToBeIncluded_
) external onlyOwner {
require(
excludedFromRewards[shareHolderToBeIncluded_],
"HODLRewardsDistributor: not excluded"
);
_updateUserShares(
shareHolderToBeIncluded_,
balanceOf(shareHolderToBeIncluded_)
);
excludedFromRewards[shareHolderToBeIncluded_] = false;
emit IncludedInRewards(shareHolderToBeIncluded_);
}
function setProcessingGasLimit(uint256 maxAmount_) external onlyOwner {
maxAutoProcessGas = maxAmount_;
}
function setMinSharePerRewards(
uint256 _minSharePerRewards
) external onlyOwner {
minShareForRewards = _minSharePerRewards;
}
function setAutoDistribute(bool _autoDistribute) external onlyOwner {
autoDistribute = _autoDistribute;
}
/**
retruns the pending rewards amount
*/
function pending(
address sharholderAddress_
) public view returns (uint256 pendingAmount) {
ShareHolder storage user = shareHolders[sharholderAddress_];
pendingAmount = user.shares.mul(accPerShare).div(1e36).sub(
user.rewardDebt
);
}
function totalPending() public view returns (uint256) {
return accPerShare.mul(totalShares).div(1e36).sub(totalRewardsDebt);
}
/**
returns information about the share holder
*/
function shareHolderInfo(
address shareHoldr_
) external view returns (ShareHolder memory) {
ShareHolder storage user = shareHolders[shareHoldr_];
return
ShareHolder(
user.shares, // How many tokens the user is holding.
user.rewardDebt, // see @masterChef contract for more details
user.claimed,
pending(shareHoldr_)
);
}
function holders() external view returns (uint256) {
return allShareHolders.length;
}
function _setShare(address sharholderAddress_, uint256 amount_) internal {
ShareHolder storage user = shareHolders[sharholderAddress_];
// pay any pending rewards
if (user.shares > 0) claimPending(sharholderAddress_);
// update total shares
_updateUserShares(sharholderAddress_, amount_);
}
/*
excludes shareHolderToBeExcluded_ from participating in rewards
Will distribute what ever pending rewards he has to all other shareholders
This is needed in case a contract that can't claim needs to be excluded
If owner wants the excluded to receive their pending rewards he can call claimPending on their behalf before calling this function
*/
function excludeFromRewards(
address shareHolderToBeExcluded_
) external onlyOwner {
_excludeFromRewards(shareHolderToBeExcluded_);
}
function _excludeFromRewards(address shareHolderToBeExcluded_) internal {
if (excludedFromRewards[shareHolderToBeExcluded_]) return;
uint256 amountPending = pending(shareHolderToBeExcluded_);
// update this user's shares to 0
_updateUserShares(shareHolderToBeExcluded_, 0);
// distribute his pending share to all shareholders
if (amountPending > 0) _updateGlobalShares(amountPending);
excludedFromRewards[shareHolderToBeExcluded_] = true;
emit ExcludedFromRewards(shareHolderToBeExcluded_);
}
/**
@dev
claim pending rewards for sharholderAddress_
can be called by anyone but only sharholderAddress_
can receive the reward
*/
function claimPending(address sharholderAddress_) public {
ShareHolder storage user = shareHolders[sharholderAddress_];
uint256 pendingAmount = user.shares.mul(accPerShare).div(1e36).sub(
user.rewardDebt
);
if (pendingAmount <= 0) return;
totalRewardsDebt = totalRewardsDebt.sub(user.rewardDebt);
user.rewardDebt = user.shares.mul(accPerShare).div(1e36);
totalRewardsDebt = totalRewardsDebt.add(user.rewardDebt);
bool sent;
if (isWethRewardToken) {
(sent, ) = payable(sharholderAddress_).call{value: pendingAmount}(
""
);
//if !sent means probably the receiver is a non payable address
if (!sent) {
// add pending amount to global shares to prevent loss of ETH
_updateGlobalShares(pendingAmount);
}
} else {
IERC20(rewardToken).transfer(sharholderAddress_, pendingAmount);
sent = true;
}
if (sent) {
emit Claimed(sharholderAddress_, pendingAmount);
user.claimed = user.claimed.add(pendingAmount);
totalClaimed = totalClaimed.add(pendingAmount);
}
}
bool private _inBatchProcess;
function batchProcessClaims(uint256 gas) public {
if (gasleft() < gas || _inBatchProcess) return;
_inBatchProcess = true;
uint256 gasUsed = 0;
uint256 gasLeft = gasleft();
uint256 iterations = 1; // index 0 is ocupied by address(0)
uint256 index = _lastProccessedIndex;
// we
while (gasUsed < gas && iterations < allShareHolders.length) {
claimPending(allShareHolders[index]);
gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
gasLeft = gasleft();
index = _incrementLastProccessed(index);
iterations++;
}
_lastProccessedIndex = index;
_inBatchProcess = false;
}
/**
updates the accumulatedPerShare amount based on the new amount and total shares
*/
uint256 reserved = 0;
function _updateGlobalShares(uint256 amount_) internal {
if (totalShares == 0) {
reserved = reserved.add(amount_);
return;
}
accPerShare = accPerShare.add(amount_.mul(1e36).div(totalShares)).add(
reserved.mul(1e36).div(totalShares)
);
reserved = 0;
emit RewardsAdded(amount_);
}
function updateGlobalShares(uint256 amount_) external onlyOwner {
_updateGlobalShares(amount_);
}
/**
updates a user share
*/
function _updateUserShares(
address sharholderAddress_,
uint256 newAmount_
) internal {
ShareHolder storage user = shareHolders[sharholderAddress_];
totalShares = totalShares.sub(user.shares).add(newAmount_);
totalRewardsDebt = totalRewardsDebt.sub(user.rewardDebt);
user.shares = newAmount_;
user.rewardDebt = user.shares.mul(accPerShare).div(1e36);
totalRewardsDebt = totalRewardsDebt.add(user.rewardDebt);
if (user.shares > 0 && indexOfShareHolders[sharholderAddress_] == 0) {
// add this shareHolder to array
allShareHolders.push(sharholderAddress_);
indexOfShareHolders[sharholderAddress_] =
allShareHolders.length -
1;
} else if (
user.shares == 0 && indexOfShareHolders[sharholderAddress_] != 0
) {
// remove this share holder from array
uint256 index = indexOfShareHolders[sharholderAddress_];
allShareHolders[index] = allShareHolders[
allShareHolders.length - 1
];
indexOfShareHolders[
allShareHolders[allShareHolders.length - 1]
] = index;
allShareHolders.pop();
indexOfShareHolders[sharholderAddress_] = 0;
}
emit ShareUpdated(sharholderAddress_, newAmount_);
}
function _incrementLastProccessed(
uint256 _index
) internal view returns (uint256) {
_index++;
if (_index >= allShareHolders.length) _index = 1;
return _index;
}
}
abstract contract DividendsTokenCustomVotes is ERC20VotesDecimals, Ownable {
/* Universal distributor */
using SafeMath for uint256;
using SafeERC20 for IERC20;
uint256 public minShareForRewards;
uint256 public maxAutoProcessGas = 500000;
bool public autoDistribute = true;
uint256 public accPerShare; // Accumulated per share, times 1e36.
uint256 public totalShares; // total number of shares
uint256 public totalClaimed; // total amount claimed
uint256 public totalRewardsDebt; // total amount claimed
// use getShare-holderInfo function to get this data
mapping(address => ShareHolder) shareHolders;
address[] public allShareHolders;
mapping(address => uint256) public indexOfShareHolders;
uint256 private _lastProccessedIndex = 1;
mapping(address => bool) public excludedFromRewards;
// events
event Claimed(address indexed claimer, uint256 indexed amount);
event RewardsAdded(uint256 indexed amount);
event ShareUpdated(
address indexed shareHolder,
uint256 indexed sharesAmount
);
event IncludedInRewards(address indexed shareHolder);
event ExcludedFromRewards(address indexed shareHolder);
address public immutable weth;
address public immutable rewardToken;
bool immutable isWethRewardToken;
/** */
uint256 public constant PERCENT_DENOMINATOR = 1000;
uint256 public constant MAX_TAX = 200; // 20%
IUniswapV2Router02 public immutable uniswapV2Router;
address public immutable uniswapV2Pair;
address public immutable wrappedNativeAddress;
address public immutable mainLPToken;
ERC20TempHolder public immutable tempHolder = new ERC20TempHolder();
bool public immutable sameTokenForRewards;
address public charityAddress;
address public marketingAddress;
address public autoLiquidityAddress;
TaxInfo public transferTax;
TaxInfo public buyTax;
TaxInfo public sellTax;
bool public isTaxActive;
bool public swapAndLiquifyActive = true;
uint256 public minTokensBeforeSwap; // 1 token
mapping(address => bool) public isExcludedFromFee;
mapping(address => bool) public isPair;
uint256 public charityReserves;
uint256 public marketingReserves;
uint256 public autoLiquidityReserves;
uint256 public reflectionReserves;
bool public swapTaxes;
function setSwapTaxes(bool _swapTaxes) external onlyOwner {
swapTaxes = _swapTaxes;
}
constructor(DividendConstructorArgs memory _args) {
minTokensBeforeSwap = (1 * 10) ** (decimals() - 1);
uniswapV2Router = _args.uniswapV2Router;
address __weth = _args.uniswapV2Router.WETH();
wrappedNativeAddress = __weth;
uniswapV2Pair = IUniswapV2Factory(_args.uniswapFactory).createPair(
address(this),
_args.mainLPToken
);
isPair[uniswapV2Pair] = true;
mainLPToken = _args.mainLPToken;
allShareHolders.push(address(0)); // use the index zero for address zero
weth = __weth;
rewardToken = _args.sameTokenForRewards
? address(this)
: _args.mainLPToken;
isWethRewardToken =
!_args.sameTokenForRewards &&
__weth == _args.mainLPToken;
charityAddress = _args.charityAddress;
marketingAddress = _args.marketingAddress;
autoLiquidityAddress = _args.autoLiquidityAddress;
isExcludedFromFee[owner()] = true;
isExcludedFromFee[address(this)] = true;
isExcludedFromFee[charityAddress] = true;
isExcludedFromFee[marketingAddress] = true;
isExcludedFromFee[address(tempHolder)] = true;
transferTax = _args.transferTaxInfo;
buyTax = _args.buyTaxInfo;
sellTax = _args.sellTaxInfo;
excludedFromRewards[uniswapV2Pair] = true;
excludedFromRewards[address(this)] = true;
excludedFromRewards[address(_args.uniswapV2Router)] = true;
excludedFromRewards[address(tempHolder)] = true;
excludedFromRewards[owner()] = true;
// approve max uint for router
_approve(address(this), address(uniswapV2Router), type(uint256).max);
// approve max int mainLPToken for router
IERC20(_args.mainLPToken).approve(
address(uniswapV2Router),
type(uint256).max
);
swapTaxes = _args.swapTaxes;
minShareForRewards = _args.minShareForRewards;
sameTokenForRewards = _args.sameTokenForRewards;
}
function transfer(
address recipient,
uint256 amount
) public virtual override returns (bool) {
_customTransfer(_msgSender(), recipient, amount);
return true;
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
require(
amount <= allowance(sender, _msgSender()),
"Transfer amount exceeds allowance"
);
_customTransfer(sender, recipient, amount);
unchecked {
_approve(
sender,
_msgSender(),
allowance(sender, _msgSender()) - amount
);
}
return true;
}
bool inSwap = false;
function _customTransfer(
address from,
address to,
uint256 amount
) internal virtual {
if (from == address(this) || to == address(this)) {
_transfer(from, to, amount);
return;
}
// TODO: implement taxes
if (from != uniswapV2Pair && swapAndLiquifyActive) {
processReserves();
}
// if excluded then do normal transfer
if (
!isTaxActive ||
inSwap ||
isExcludedFromFee[from] ||
isExcludedFromFee[to] ||
amount == 0
) {
_transfer(from, to, amount);
return;
}
// if not excluded then apply tax
TaxInfo memory taxInfo;
uint64 totalTax;
uint256 taxAmount;
if (!isPair[from] && !isPair[to]) {
taxInfo = transferTax;
} else if (isPair[from] && !isPair[to]) {
taxInfo = buyTax;
} else {
taxInfo = sellTax;
}
unchecked {
totalTax =
taxInfo.charity +
taxInfo.autoLiquidity +
taxInfo.marketing +
taxInfo.reflection;
taxAmount = (amount * totalTax) / PERCENT_DENOMINATOR;
}
if (taxAmount > 0) _transfer(from, address(this), taxAmount);
_transfer(from, to, amount - taxAmount);
// prevent div by zero
if (totalTax == 0) return;
unchecked {
// charity
charityReserves += (taxAmount * taxInfo.charity) / totalTax;
// auto liquidity
autoLiquidityReserves +=
(taxAmount * taxInfo.autoLiquidity) /
totalTax;
// marketing
marketingReserves += (taxAmount * taxInfo.marketing) / totalTax;
// reflection
reflectionReserves += (taxAmount * taxInfo.reflection) / totalTax;
}
}
// setters
function setCharityAddress(address _charityAddress) external onlyOwner {
charityAddress = _charityAddress;
}
function setMarketingAddress(address _marketingAddress) external onlyOwner {
marketingAddress = _marketingAddress;
}
function setAutoLiquidityAddress(
address _autoLiquidityAddress
) external onlyOwner {
autoLiquidityAddress = _autoLiquidityAddress;
}
function setTransferTax(
uint64 _charity,
uint64 _autoLiquidity,
uint64 _marketing,
uint64 _holdersRewards
) external onlyOwner {
require(
_charity + _autoLiquidity + _marketing + _holdersRewards <= MAX_TAX,
"Transfer tax too high"
);
transferTax = TaxInfo(
_charity,
_autoLiquidity,
_marketing,
_holdersRewards
);
}
function setBuyTax(
uint64 _charity,
uint64 _autoLiquidity,
uint64 _marketing,
uint64 _holdersRewards
) external onlyOwner {
require(
_charity + _autoLiquidity + _marketing + _holdersRewards <= MAX_TAX,
"Buy tax too high"
);
buyTax = TaxInfo(_charity, _autoLiquidity, _marketing, _holdersRewards);
}
function setSellTax(
uint64 _charity,
uint64 _autoLiquidity,
uint64 _marketing,
uint64 _holdersRewards
) external onlyOwner {
require(
_charity + _autoLiquidity + _marketing + _holdersRewards <= MAX_TAX,
"Sell tax too high"
);
sellTax = TaxInfo(
_charity,
_autoLiquidity,
_marketing,
_holdersRewards
);
}
function setExcludedFromFee(
address account,
bool excluded
) external onlyOwner {
isExcludedFromFee[account] = excluded;
}
function setPair(address pair, bool value) external onlyOwner {
require(pair != uniswapV2Pair, "Cannot change pair");
isPair[pair] = value;
}
function setTaxActive(bool value) external onlyOwner {
isTaxActive = value;
}
function setSwapAndLiquifyActive(
bool _swapAndLiquifyActive
) external onlyOwner {
swapAndLiquifyActive = _swapAndLiquifyActive;
}
function setMinTokensBeforeSwap(
uint256 _minTokensBeforeSwap
) external onlyOwner {
minTokensBeforeSwap = _minTokensBeforeSwap;
}
function processReserves() public {
if (inSwap) return;
inSwap = true;
if (
charityReserves > minTokensBeforeSwap &&
charityAddress != address(0)
) {
if (swapTaxes) {
if (mainLPToken == wrappedNativeAddress) {
swapForETH(charityReserves, charityAddress);
} else {
swapForERC20(charityReserves, charityAddress);
}
} else _transfer(address(this), charityAddress, charityReserves);
delete charityReserves;
}
if (marketingReserves > minTokensBeforeSwap) {
if (swapTaxes) {
if (mainLPToken == wrappedNativeAddress) {
swapForETH(marketingReserves, marketingAddress);
} else {
swapForERC20(marketingReserves, marketingAddress);
}
} else
_transfer(address(this), marketingAddress, marketingReserves);
delete marketingReserves;
}
if (reflectionReserves > minTokensBeforeSwap && !sameTokenForRewards) {
if (mainLPToken == wrappedNativeAddress) {
uint256 initialBalance = address(this).balance;
swapForETH(reflectionReserves, address(this));
uint256 balanceAfter = address(this).balance - initialBalance;
_updateGlobalShares(balanceAfter);
} else {
swapForERC20(reflectionReserves, address(tempHolder));
uint256 balanceAfter = IERC20(mainLPToken).balanceOf(
address(tempHolder)
);
tempHolder.transfer(mainLPToken, address(this), balanceAfter);
_updateGlobalShares(balanceAfter);
}
delete reflectionReserves;
} else if (sameTokenForRewards) {
_updateGlobalShares(reflectionReserves);
delete reflectionReserves;
}
if (
autoLiquidityReserves / 2 > minTokensBeforeSwap &&
autoLiquidityAddress != address(0)
) {
autoLiquidityReserves = swapAndLiquify(autoLiquidityReserves);
}
inSwap = false;
}
function swapAndLiquify(uint256 _amount) internal returns (uint256) {
uint256 half = _amount / 2;
uint256 otherHalf = _amount - half;
uint256 leftOver;
if (mainLPToken == wrappedNativeAddress) {
uint256 initialBalance = address(this).balance;
swapForETH(half, address(this));
uint256 newBalance = address(this).balance - initialBalance;
(uint amountToken, , ) = addLiquidityETH(otherHalf, newBalance);
leftOver = otherHalf - amountToken;
} else {
swapForERC20(half, address(tempHolder));
uint256 newBalance = IERC20(mainLPToken).balanceOf(
address(tempHolder)
);
tempHolder.transfer(mainLPToken, address(this), newBalance);
(uint amountToken, , ) = addLiquidityERC20(otherHalf, newBalance);
leftOver = otherHalf - amountToken;
}
return leftOver;
}
function addLiquidityETH(
uint256 _tokenAmount,
uint256 _NativeAmount
) private returns (uint, uint, uint) {
return
uniswapV2Router.addLiquidityETH{value: _NativeAmount}(
address(this),
_tokenAmount,
0,
0,
autoLiquidityAddress,
block.timestamp
);
}
function addLiquidityERC20(
uint256 _tokenAmount,
uint256 _counterPartAmount
) private returns (uint, uint, uint) {
return
uniswapV2Router.addLiquidity(
address(this),
mainLPToken,
_tokenAmount,
_counterPartAmount,
0,
0,
autoLiquidityAddress,
block.timestamp
);
}
function swapForETH(uint256 _amount, address _to) internal {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = wrappedNativeAddress;
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
_amount,
0,
path,
_to,
block.timestamp
);
}
function swapForERC20(uint256 _amount, address _to) internal {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = mainLPToken;
uniswapV2Router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
_amount,
0,
path,
_to,
block.timestamp
);
}
receive() external payable {
// only receive from router
require(msg.sender == address(uniswapV2Router), "Invalid sender");
}
function _afterTokenTransfer(
address from_,
address to_,
uint256
) internal virtual override {
_updateShare(from_);
_updateShare(to_);
if (!inSwap) _massProcess();
}
function _massProcess() internal {
if (autoDistribute)
batchProcessClaims(
gasleft() > maxAutoProcessGas
? maxAutoProcessGas
: (gasleft() * 80) / 100
);
}
function _updateShare(address wallet) internal {
if (!excludedFromRewards[wallet])
_setShare(
wallet,
balanceOf(wallet) > minShareForRewards ? balanceOf(wallet) : 0
);
}
function includeInRewards(
address shareHolderToBeIncluded_
) external onlyOwner {
require(
excludedFromRewards[shareHolderToBeIncluded_],
"HODLRewardsDistributor: not excluded"
);
_updateUserShares(
shareHolderToBeIncluded_,
balanceOf(shareHolderToBeIncluded_)
);
excludedFromRewards[shareHolderToBeIncluded_] = false;
emit IncludedInRewards(shareHolderToBeIncluded_);
}
function setProcessingGasLimit(uint256 maxAmount_) external onlyOwner {
maxAutoProcessGas = maxAmount_;
}
function setMinSharePerRewards(
uint256 _minSharePerRewards
) external onlyOwner {
minShareForRewards = _minSharePerRewards;
}
function setAutoDistribute(bool _autoDistribute) external onlyOwner {
autoDistribute = _autoDistribute;
}
/**
retruns the pending rewards amount
*/
function pending(
address sharholderAddress_
) public view returns (uint256 pendingAmount) {
ShareHolder storage user = shareHolders[sharholderAddress_];
pendingAmount = user.shares.mul(accPerShare).div(1e36).sub(
user.rewardDebt
);
}
function totalPending() public view returns (uint256) {
return accPerShare.mul(totalShares).div(1e36).sub(totalRewardsDebt);
}
/**
returns information about the share holder
*/
function shareHolderInfo(
address shareHoldr_
) external view returns (ShareHolder memory) {
ShareHolder storage user = shareHolders[shareHoldr_];
return
ShareHolder(
user.shares, // How many tokens the user is holding.
user.rewardDebt, // see @masterChef contract for more details
user.claimed,
pending(shareHoldr_)
);
}
function holders() external view returns (uint256) {
return allShareHolders.length;
}
function _setShare(address sharholderAddress_, uint256 amount_) internal {
ShareHolder storage user = shareHolders[sharholderAddress_];
// pay any pending rewards
if (user.shares > 0) claimPending(sharholderAddress_);
// update total shares
_updateUserShares(sharholderAddress_, amount_);
}
/*
excludes shareHolderToBeExcluded_ from participating in rewards
Will distribute what ever pending rewards he has to all other shareholders
This is needed in case a contract that can't claim needs to be excluded
If owner wants the excluded to receive their pending rewards he can call claimPending on their behalf before calling this function
*/
function excludeFromRewards(
address shareHolderToBeExcluded_
) external onlyOwner {
_excludeFromRewards(shareHolderToBeExcluded_);
}
function _excludeFromRewards(address shareHolderToBeExcluded_) internal {
if (excludedFromRewards[shareHolderToBeExcluded_]) return;
uint256 amountPending = pending(shareHolderToBeExcluded_);
// update this user's shares to 0
_updateUserShares(shareHolderToBeExcluded_, 0);
// distribute his pending share to all shareholders
if (amountPending > 0) _updateGlobalShares(amountPending);
excludedFromRewards[shareHolderToBeExcluded_] = true;
emit ExcludedFromRewards(shareHolderToBeExcluded_);
}
/**
@dev
claim pending rewards for sharholderAddress_
can be called by anyone but only sharholderAddress_
can receive the reward
*/
function claimPending(address sharholderAddress_) public {
ShareHolder storage user = shareHolders[sharholderAddress_];
uint256 pendingAmount = user.shares.mul(accPerShare).div(1e36).sub(
user.rewardDebt
);
if (pendingAmount <= 0) return;
totalRewardsDebt = totalRewardsDebt.sub(user.rewardDebt);
user.rewardDebt = user.shares.mul(accPerShare).div(1e36);
totalRewardsDebt = totalRewardsDebt.add(user.rewardDebt);
bool sent;
if (isWethRewardToken) {
(sent, ) = payable(sharholderAddress_).call{value: pendingAmount}(
""
);
//if !sent means probably the receiver is a non payable address
if (!sent) {
// add pending amount to global shares to prevent loss of ETH
_updateGlobalShares(pendingAmount);
}
} else {
IERC20(rewardToken).transfer(sharholderAddress_, pendingAmount);
sent = true;
}
if (sent) {
emit Claimed(sharholderAddress_, pendingAmount);
user.claimed = user.claimed.add(pendingAmount);
totalClaimed = totalClaimed.add(pendingAmount);
}
}
bool private _inBatchProcess;
function batchProcessClaims(uint256 gas) public {
if (gasleft() < gas || _inBatchProcess) return;
_inBatchProcess = true;
uint256 gasUsed = 0;
uint256 gasLeft = gasleft();
uint256 iterations = 1; // index 0 is ocupied by address(0)
uint256 index = _lastProccessedIndex;
// we
while (gasUsed < gas && iterations < allShareHolders.length) {
claimPending(allShareHolders[index]);
gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
gasLeft = gasleft();
index = _incrementLastProccessed(index);
iterations++;
}
_lastProccessedIndex = index;
_inBatchProcess = false;
}
/**
updates the accumulatedPerShare amount based on the new amount and total shares
*/
uint256 reserved = 0;
function _updateGlobalShares(uint256 amount_) internal {
if (totalShares == 0) {
reserved = reserved.add(amount_);
return;
}
accPerShare = accPerShare.add(amount_.mul(1e36).div(totalShares)).add(
reserved.mul(1e36).div(totalShares)
);
reserved = 0;
emit RewardsAdded(amount_);
}
function updateGlobalShares(uint256 amount_) external onlyOwner {
_updateGlobalShares(amount_);
}
/**
updates a user share
*/
function _updateUserShares(
address sharholderAddress_,
uint256 newAmount_
) internal {
ShareHolder storage user = shareHolders[sharholderAddress_];
totalShares = totalShares.sub(user.shares).add(newAmount_);
totalRewardsDebt = totalRewardsDebt.sub(user.rewardDebt);
user.shares = newAmount_;
user.rewardDebt = user.shares.mul(accPerShare).div(1e36);
totalRewardsDebt = totalRewardsDebt.add(user.rewardDebt);
if (user.shares > 0 && indexOfShareHolders[sharholderAddress_] == 0) {
// add this shareHolder to array
allShareHolders.push(sharholderAddress_);
indexOfShareHolders[sharholderAddress_] =
allShareHolders.length -
1;
} else if (
user.shares == 0 && indexOfShareHolders[sharholderAddress_] != 0
) {
// remove this share holder from array
uint256 index = indexOfShareHolders[sharholderAddress_];
allShareHolders[index] = allShareHolders[
allShareHolders.length - 1
];
indexOfShareHolders[
allShareHolders[allShareHolders.length - 1]
] = index;
allShareHolders.pop();
indexOfShareHolders[sharholderAddress_] = 0;
}
emit ShareUpdated(sharholderAddress_, newAmount_);
}
function _incrementLastProccessed(
uint256 _index
) internal view returns (uint256) {
_index++;
if (_index >= allShareHolders.length) _index = 1;
return _index;
}
}
//
contract DividendsTokenCustomSimple is DividendsTokenCustom {
constructor(
uint256 _initialSupply,
uint8 _decimals,
string memory _name,
string memory _symbol,
address _owner,
DividendConstructorArgs memory _args
)
ERC20(_name, _symbol)
ERC20Decimals(_decimals)
Ownable(_owner)
DividendsTokenCustom(_args)
{
_mint(_owner, _initialSupply);
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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IUniswapV2Router02","name":"uniswapV2Router","type":"address"},{"internalType":"address","name":"mainLPToken","type":"address"},{"internalType":"address","name":"charityAddress","type":"address"},{"internalType":"address","name":"marketingAddress","type":"address"},{"internalType":"address","name":"autoLiquidityAddress","type":"address"},{"components":[{"internalType":"uint64","name":"charity","type":"uint64"},{"internalType":"uint64","name":"autoLiquidity","type":"uint64"},{"internalType":"uint64","name":"marketing","type":"uint64"},{"internalType":"uint64","name":"reflection","type":"uint64"}],"internalType":"struct TaxInfo","name":"transferTaxInfo","type":"tuple"},{"components":[{"internalType":"uint64","name":"charity","type":"uint64"},{"internalType":"uint64","name":"autoLiquidity","type":"uint64"},{"internalType":"uint64","name":"marketing","type":"uint64"},{"internalType":"uint64","name":"reflection","type":"uint64"}],"internalType":"struct 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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : _initialSupply (uint256): 100000000000000000000000000
Arg [1] : _decimals (uint8): 18
Arg [2] : _name (string): Inverse NFAI
Arg [3] : _symbol (string): IAFN
Arg [4] : _owner (address): 0xe0E12603979EDeF915aCbfb090c31F046b672c5d
Arg [5] : _args (tuple): System.Collections.Generic.List`1[Nethereum.ABI.FunctionEncoding.ParameterOutput]
-----Encoded View---------------
30 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000052b7d2dcc80cd2e4000000
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000340
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000380
Arg [4] : 000000000000000000000000e0e12603979edef915acbfb090c31f046b672c5d
Arg [5] : 0000000000000000000000005c69bee701ef814a2b6a3edd4b1652cb9cc5aa6f
Arg [6] : 0000000000000000000000007a250d5630b4cf539739df2c5dacb4c659f2488d
Arg [7] : 00000000000000000000000017c50d62e6e8d20d2dc18e9ad79c43263d0720d9
Arg [8] : 0000000000000000000000004902f5b173f90aad7a36fc037c2fa264781194a3
Arg [9] : 000000000000000000000000e0e12603979edef915acbfb090c31f046b672c5d
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [12] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [14] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [15] : 0000000000000000000000000000000000000000000000000000000000000014
Arg [16] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [17] : 0000000000000000000000000000000000000000000000000000000000000050
Arg [18] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [19] : 0000000000000000000000000000000000000000000000000000000000000014
Arg [20] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [21] : 0000000000000000000000000000000000000000000000000000000000000050
Arg [22] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [23] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [24] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [25] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [26] : 000000000000000000000000000000000000000000000000000000000000000c
Arg [27] : 496e7665727365204e4641490000000000000000000000000000000000000000
Arg [28] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [29] : 4941464e00000000000000000000000000000000000000000000000000000000
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Multichain Portfolio | 27 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.