// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)pragmasolidity ^0.8.0;/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/abstractcontractContext{
function_msgSender() internalviewvirtualreturns (address) {
returnmsg.sender;
}
function_msgData() internalviewvirtualreturns (bytescalldata) {
returnmsg.data;
}
}
Contract Source Code
File 2 of 8: ERC20.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)pragmasolidity ^0.8.0;import"./IERC20.sol";
import"./extensions/IERC20Metadata.sol";
import"../../utils/Context.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.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}.
*/contractERC20isContext, IERC20, IERC20Metadata{
mapping(address=>uint256) private _balances;
mapping(address=>mapping(address=>uint256)) private _allowances;
uint256private _totalSupply;
stringprivate _name;
stringprivate _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(stringmemory name_, stringmemory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/functionname() publicviewvirtualoverridereturns (stringmemory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/functionsymbol() publicviewvirtualoverridereturns (stringmemory) {
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}.
*/functiondecimals() publicviewvirtualoverridereturns (uint8) {
return18;
}
/**
* @dev See {IERC20-totalSupply}.
*/functiontotalSupply() publicviewvirtualoverridereturns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/functionbalanceOf(address account) publicviewvirtualoverridereturns (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`.
*/functiontransfer(address to, uint256 amount) publicvirtualoverridereturns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
returntrue;
}
/**
* @dev See {IERC20-allowance}.
*/functionallowance(address owner, address spender) publicviewvirtualoverridereturns (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.
*/functionapprove(address spender, uint256 amount) publicvirtualoverridereturns (bool) {
address owner = _msgSender();
_approve(owner, spender, amount);
returntrue;
}
/**
* @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`.
*/functiontransferFrom(addressfrom, address to, uint256 amount) publicvirtualoverridereturns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
returntrue;
}
/**
* @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.
*/functionincreaseAllowance(address spender, uint256 addedValue) publicvirtualreturns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
returntrue;
}
/**
* @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`.
*/functiondecreaseAllowance(address spender, uint256 subtractedValue) publicvirtualreturns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
returntrue;
}
/**
* @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(addressfrom, address to, uint256 amount) internalvirtual{
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) internalvirtual{
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) internalvirtual{
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) internalvirtual{
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) internalvirtual{
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(addressfrom, address to, uint256 amount) internalvirtual{}
/**
* @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(addressfrom, address to, uint256 amount) internalvirtual{}
}
Contract Source Code
File 3 of 8: IDividendTracker.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.23;interfaceDividendPayingTokenInterface{
/// @notice View the amount of dividend in wei that an address can withdraw./// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` can withdraw.functiondividendOf(address _owner) externalviewreturns (uint256);
/// @notice Withdraws the ether distributed to the sender./// @dev SHOULD transfer `dividendOf(msg.sender)` wei to `msg.sender`, and `dividendOf(msg.sender)` SHOULD be 0 after the transfer./// MUST emit a `DividendWithdrawn` event if the amount of ether transferred is greater than 0.functionwithdrawDividend() external;
/// @notice View the amount of dividend in wei that an address can withdraw./// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` can withdraw.functionwithdrawableDividendOf(address _owner) externalviewreturns (uint256);
/// @notice View the amount of dividend in wei that an address has withdrawn./// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` has withdrawn.functionwithdrawnDividendOf(address _owner) externalviewreturns (uint256);
/// @notice View the amount of dividend in wei that an address has earned in total./// @dev accumulativeDividendOf(_owner) = withdrawableDividendOf(_owner) + withdrawnDividendOf(_owner)/// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` has earned in total.functionaccumulativeDividendOf(address _owner) externalviewreturns (uint256);
/// @dev This event MUST emit when ether is distributed to token holders./// @param from The address which sends ether to this contract./// @param weiAmount The amount of distributed ether in wei.eventDividendsDistributed(addressindexedfrom, uint256 weiAmount);
/// @dev This event MUST emit when an address withdraws their dividend./// @param to The address which withdraws ether from this contract./// @param weiAmount The amount of withdrawn ether in wei.eventDividendWithdrawn(addressindexed to, uint256 weiAmount);
}
Contract Source Code
File 4 of 8: IERC20.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)pragmasolidity ^0.8.0;/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/interfaceIERC20{
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/eventTransfer(addressindexedfrom, addressindexed 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.
*/eventApproval(addressindexed owner, addressindexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
*/functiontotalSupply() externalviewreturns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/functionbalanceOf(address account) externalviewreturns (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.
*/functiontransfer(address to, uint256 amount) externalreturns (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.
*/functionallowance(address owner, address spender) externalviewreturns (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.
*/functionapprove(address spender, uint256 amount) externalreturns (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.
*/functiontransferFrom(addressfrom, address to, uint256 amount) externalreturns (bool);
}
Contract Source Code
File 5 of 8: IERC20Metadata.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)pragmasolidity ^0.8.0;import"../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/interfaceIERC20MetadataisIERC20{
/**
* @dev Returns the name of the token.
*/functionname() externalviewreturns (stringmemory);
/**
* @dev Returns the symbol of the token.
*/functionsymbol() externalviewreturns (stringmemory);
/**
* @dev Returns the decimals places of the token.
*/functiondecimals() externalviewreturns (uint8);
}
Contract Source Code
File 6 of 8: Ownable.sol
// SPDX-License-Identifier: MIT// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)pragmasolidity ^0.8.0;import"../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/abstractcontractOwnableisContext{
addressprivate _owner;
eventOwnershipTransferred(addressindexed previousOwner, addressindexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/modifieronlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/functionowner() publicviewvirtualreturns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/function_checkOwner() internalviewvirtual{
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling any functionality that is only available to the owner.
*/functionrenounceOwnership() publicvirtualonlyOwner{
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/functiontransferOwnership(address newOwner) publicvirtualonlyOwner{
require(newOwner !=address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/function_transferOwnership(address newOwner) internalvirtual{
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
Contract Source Code
File 7 of 8: SafeMath.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.6;librarySafeMath{
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/functionadd(uint256 a, uint256 b) internalpurereturns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @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.
*/functionsub(uint256 a, uint256 b) internalpurereturns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/functionsub(uint256 a,
uint256 b,
stringmemory errorMessage
) internalpurereturns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/functionmul(uint256 a, uint256 b) internalpurereturns (uint256) {
// 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/522if (a ==0) {
return0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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.
*/functiondiv(uint256 a, uint256 b) internalpurereturns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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.
*/functiondiv(uint256 a,
uint256 b,
stringmemory errorMessage
) internalpurereturns (uint256) {
require(b >0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't holdreturn c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts 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.
*/functionmod(uint256 a, uint256 b) internalpurereturns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message 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.
*/functionmod(uint256 a,
uint256 b,
stringmemory errorMessage
) internalpurereturns (uint256) {
require(b !=0, errorMessage);
return a % b;
}
}
/**
* @title SafeMathInt
* @dev Math operations for int256 with overflow safety checks.
*/librarySafeMathInt{
int256privateconstant MIN_INT256 =int256(1) <<255;
int256privateconstant MAX_INT256 =~(int256(1) <<255);
/**
* @dev Multiplies two int256 variables and fails on overflow.
*/functionmul(int256 a, int256 b) internalpurereturns (int256) {
int256 c = a * b;
// Detect overflow when multiplying MIN_INT256 with -1require(c != MIN_INT256 || (a & MIN_INT256) != (b & MIN_INT256));
require((b ==0) || (c / b == a));
return c;
}
/**
* @dev Division of two int256 variables and fails on overflow.
*/functiondiv(int256 a, int256 b) internalpurereturns (int256) {
// Prevent overflow when dividing MIN_INT256 by -1require(b !=-1|| a != MIN_INT256);
// Solidity already throws when dividing by 0.return a / b;
}
/**
* @dev Subtracts two int256 variables and fails on overflow.
*/functionsub(int256 a, int256 b) internalpurereturns (int256) {
int256 c = a - b;
require((b >=0&& c <= a) || (b <0&& c > a));
return c;
}
/**
* @dev Adds two int256 variables and fails on overflow.
*/functionadd(int256 a, int256 b) internalpurereturns (int256) {
int256 c = a + b;
require((b >=0&& c >= a) || (b <0&& c < a));
return c;
}
/**
* @dev Converts to absolute value, and fails on overflow.
*/functionabs(int256 a) internalpurereturns (int256) {
require(a != MIN_INT256);
return a <0 ? -a : a;
}
functiontoUint256Safe(int256 a) internalpurereturns (uint256) {
require(a >=0);
returnuint256(a);
}
}
/**
* @title SafeMathUint
* @dev Math operations with safety checks that revert on error
*/librarySafeMathUint{
functiontoInt256Safe(uint256 a) internalpurereturns (int256) {
int256 b =int256(a);
require(b >=0);
return b;
}
}
Contract Source Code
File 8 of 8: TAOXDividendTracker.sol
// Website: https://taox.ai// Twitter: https://x.com/taox_ai// Telegram: https://t.me/taox_ai// SPDX-License-Identifier: MITpragmasolidity ^0.8.10;import"@openzeppelin/contracts/utils/Context.sol";
import"@openzeppelin/contracts/access/Ownable.sol";
import"@openzeppelin/contracts/token/ERC20/ERC20.sol";
import"@openzeppelin/contracts/interfaces/IERC20.sol";
import"./libs/SafeMath.sol";
import"./interfaces/IDividendTracker.sol";
interfaceIPair{
functiongetReserves()
externalviewreturns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
functiontoken0() externalviewreturns (address);
}
interfaceIFactory{
functioncreatePair(address tokenA,
address tokenB
) externalreturns (address pair);
functiongetPair(address tokenA,
address tokenB
) externalviewreturns (address pair);
}
interfaceIUniswapRouter{
functionfactory() externalpurereturns (address);
functionWETH() externalpurereturns (address);
functionaddLiquidityETH(address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
)
externalpayablereturns (uint amountToken, uint amountETH, uint liquidity);
functionswapExactTokensForTokensSupportingFeeOnTransferTokens(uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
functionswapExactETHForTokens(uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) externalpayablereturns (uint[] memory amounts);
functionswapExactTokensForETHSupportingFeeOnTransferTokens(uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
contractDividendPayingTokenisERC20, DividendPayingTokenInterface, Ownable{
usingSafeMathforuint256;
usingSafeMathUintforuint256;
usingSafeMathIntforint256;
addresspublic rewardToken;
// With `magnitude`, we can properly distribute dividends even if the amount of received ether is small.// For more discussion about choosing the value of `magnitude`,// see https://github.com/ethereum/EIPs/issues/1726#issuecomment-472352728uint256internalconstant magnitude =2**128;
uint256internal magnifiedDividendPerShare;
// About dividendCorrection:// If the token balance of a `_user` is never changed, the dividend of `_user` can be computed with:// `dividendOf(_user) = dividendPerShare * balanceOf(_user)`.// When `balanceOf(_user)` is changed (via minting/burning/transferring tokens),// `dividendOf(_user)` should not be changed,// but the computed value of `dividendPerShare * balanceOf(_user)` is changed.// To keep the `dividendOf(_user)` unchanged, we add a correction term:// `dividendOf(_user) = dividendPerShare * balanceOf(_user) + dividendCorrectionOf(_user)`,// where `dividendCorrectionOf(_user)` is updated whenever `balanceOf(_user)` is changed:// `dividendCorrectionOf(_user) = dividendPerShare * (old balanceOf(_user)) - (new balanceOf(_user))`.// So now `dividendOf(_user)` returns the same value before and after `balanceOf(_user)` is changed.mapping(address=>int256) internal magnifiedDividendCorrections;
mapping(address=>uint256) internal withdrawnDividends;
uint256public totalDividendsDistributed;
uint256public totalDividendsWithdrawn;
constructor(stringmemory _name,
stringmemory _symbol
) ERC20(_name, _symbol) {}
function_distributeLPDividends(uint256 amount) internalvirtual{
require(totalSupply() >0);
if (amount >0) {
magnifiedDividendPerShare = magnifiedDividendPerShare.add(
(amount).mul(magnitude) / totalSupply()
);
emit DividendsDistributed(msg.sender, amount);
totalDividendsDistributed = totalDividendsDistributed.add(amount);
}
}
/// @notice Withdraws the ether distributed to the sender./// @dev It emits a `DividendWithdrawn` event if the amount of withdrawn ether is greater than 0.functionwithdrawDividend() publicvirtualoverride{
_withdrawDividendOfUser(payable(msg.sender));
}
/// @notice Withdraws the ether distributed to the sender./// @dev It emits a `DividendWithdrawn` event if the amount of withdrawn ether is greater than 0.function_withdrawDividendOfUser(addresspayable user
) internalreturns (uint256) {
uint256 _withdrawableDividend = withdrawableDividendOf(user);
if (_withdrawableDividend >0) {
withdrawnDividends[user] = withdrawnDividends[user].add(
_withdrawableDividend
);
totalDividendsWithdrawn += _withdrawableDividend;
emit DividendWithdrawn(user, _withdrawableDividend);
bool success = IERC20(rewardToken).transfer(
user,
_withdrawableDividend
);
if (!success) {
withdrawnDividends[user] = withdrawnDividends[user].sub(
_withdrawableDividend
);
totalDividendsWithdrawn -= _withdrawableDividend;
return0;
}
return _withdrawableDividend;
}
return0;
}
/// @notice View the amount of dividend in wei that an address can withdraw./// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` can withdraw.functiondividendOf(address _owner) publicviewoverridereturns (uint256) {
return withdrawableDividendOf(_owner);
}
/// @notice View the amount of dividend in wei that an address can withdraw./// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` can withdraw.functionwithdrawableDividendOf(address _owner
) publicviewoverridereturns (uint256) {
return accumulativeDividendOf(_owner).sub(withdrawnDividends[_owner]);
}
/// @notice View the amount of dividend in wei that an address has withdrawn./// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` has withdrawn.functionwithdrawnDividendOf(address _owner
) publicviewoverridereturns (uint256) {
return withdrawnDividends[_owner];
}
/// @notice View the amount of dividend in wei that an address has earned in total./// @dev accumulativeDividendOf(_owner) = withdrawableDividendOf(_owner) + withdrawnDividendOf(_owner)/// = (magnifiedDividendPerShare * balanceOf(_owner) + magnifiedDividendCorrections[_owner]) / magnitude/// @param _owner The address of a token holder./// @return The amount of dividend in wei that `_owner` has earned in total.functionaccumulativeDividendOf(address _owner
) publicviewoverridereturns (uint256) {
return
magnifiedDividendPerShare
.mul(balanceOf(_owner))
.toInt256Safe()
.add(magnifiedDividendCorrections[_owner])
.toUint256Safe() / magnitude;
}
/// @dev Internal function that transfer tokens from one address to another./// Update magnifiedDividendCorrections to keep dividends unchanged./// @param from The address to transfer from./// @param to The address to transfer to./// @param value The amount to be transferred.function_transfer(addressfrom,
address to,
uint256 value
) internalvirtualoverride{
require(false);
int256 _magCorrection = magnifiedDividendPerShare
.mul(value)
.toInt256Safe();
magnifiedDividendCorrections[from] = magnifiedDividendCorrections[from]
.add(_magCorrection);
magnifiedDividendCorrections[to] = magnifiedDividendCorrections[to].sub(
_magCorrection
);
}
/// @dev Internal function that mints tokens to an account./// Update magnifiedDividendCorrections to keep dividends unchanged./// @param account The account that will receive the created tokens./// @param value The amount that will be created.function_mint(address account, uint256 value) internaloverride{
super._mint(account, value);
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[
account
].sub((magnifiedDividendPerShare.mul(value)).toInt256Safe());
}
/// @dev Internal function that burns an amount of the token of a given account./// Update magnifiedDividendCorrections to keep dividends unchanged./// @param account The account whose tokens will be burnt./// @param value The amount that will be burnt.function_burn(address account, uint256 value) internaloverride{
super._burn(account, value);
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[
account
].add((magnifiedDividendPerShare.mul(value)).toInt256Safe());
}
function_setBalance(address account, uint256 newBalance) internal{
uint256 currentBalance = balanceOf(account);
if (newBalance > currentBalance) {
uint256 mintAmount = newBalance.sub(currentBalance);
_mint(account, mintAmount);
} elseif (newBalance < currentBalance) {
uint256 burnAmount = currentBalance.sub(newBalance);
_burn(account, burnAmount);
}
}
}
contractTAOXDividendTrackerisOwnable, DividendPayingToken{
structAccountInfo {
address account;
uint256 withdrawableDividends;
uint256 totalDividends;
uint256 lastClaimTime;
}
mapping(address=>bool) public excludedFromDividends;
mapping(address=>uint256) public lastClaimTimes;
addresspublic taox;
boolpublic claimEnabled;
eventExcludeFromDividends(addressindexed account, bool value);
eventClaim(addressindexed account, uint256 amount);
constructor(address _wtao
) DividendPayingToken("TAOx_Dividend", "TAOx_Dividend") {
rewardToken = _wtao;
}
modifieronlyOwnerOrTAOX() {
require(
_msgSender() == owner() || _msgSender() == taox,
"caller is not the onlyOwner or TAOX"
);
_;
}
functionsetup(address _router, address _pair) external{
require(taox ==address(0), "Already initialized");
taox = _msgSender();
_excludeFromDividends(address(this), true);
_excludeFromDividends(taox, true);
_excludeFromDividends(owner(), true);
_excludeFromDividends(_router, true);
_excludeFromDividends(_pair, true);
}
function_transfer(address, address, uint256) internalpureoverride{
require(false, "Dividend_Tracker: No transfers allowed");
}
functionexcludeFromDividends(address account,
bool value
) publiconlyOwner{
_excludeFromDividends(account, value);
}
function_excludeFromDividends(address account, bool value) private{
require(excludedFromDividends[account] != value);
excludedFromDividends[account] = value;
if (value ==true) {
_setBalance(account, 0);
} else {
_setBalance(account, balanceOf(account));
}
emit ExcludeFromDividends(account, value);
}
functiongetAccount(address account
) publicviewreturns (address, uint256, uint256, uint256, uint256) {
AccountInfo memory info;
info.account = account;
info.withdrawableDividends = withdrawableDividendOf(account);
info.totalDividends = accumulativeDividendOf(account);
info.lastClaimTime = lastClaimTimes[account];
return (
info.account,
info.withdrawableDividends,
info.totalDividends,
info.lastClaimTime,
totalDividendsWithdrawn
);
}
functionsetBalance(address account,
uint256 newBalance
) externalonlyOwnerOrTAOX{
if (excludedFromDividends[account]) {
return;
}
_setBalance(account, newBalance);
}
functionsetClaimEnabled(bool value) externalonlyOwner{
claimEnabled = value;
}
functionclaimRewards() external{
require(claimEnabled, "Claim is disabled");
uint256 amount = _withdrawDividendOfUser(payable(_msgSender()));
if (amount >0) {
lastClaimTimes[_msgSender()] =block.timestamp;
emit Claim(_msgSender(), amount);
}
}
functiondistributeRewards(uint256 amount) publiconlyOwner{
IERC20(rewardToken).transferFrom(_msgSender(), address(this), amount);
_distributeLPDividends(amount);
}
functionupdateRewardToken(address _token) externalonlyOwner{
rewardToken = _token;
}
functiontrackerRescueETH20Tokens(address tokenAddress,
uint256 amount
) externalonlyOwner{
IERC20(tokenAddress).transfer(_msgSender(), amount);
}
functiontrackerRescueETH() externalonlyOwner{
payable(_msgSender()).transfer(address(this).balance);
}
}