Contract Source Code:
File 1 of 1 : DIVToken2
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
/*
* @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 GSN 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 payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when 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.
*/
library SafeMath {
/**
* @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) {
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.
*/
function sub(uint256 a, uint256 b) internal pure returns (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.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (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.
*/
function mul(uint256 a, uint256 b) internal pure returns (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/522
if (a == 0) {
return 0;
}
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.
*/
function div(uint256 a, uint256 b) internal pure returns (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.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return 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.
*/
function mod(uint256 a, uint256 b) internal pure returns (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.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
* called.
*
* 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 returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `to` 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 = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(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);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(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 Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @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 to 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 { }
}
/// @title DIV token rewards buyers from specific addresses (AMMs such as uniswap) by minting purchase rewards immediately, and burns a percentage of all on chain transactions.
/// @author Nijitoki Labs; in collaboration with CommunityToken.io; original ver. by KrippTorofu @ RiotOfTheBlock
/// NOTES: This version includes uniswap router registration, to prevent owner from setting mint addresses that are not UniswapV2Pairs.
/// No tax/burn limits have been added to this token.
/// Until the Ownership is rescinded, owner can modify the parameters of the contract (tax, interest, whitelisted addresses, uniswap pairs).
/// Minting is disabled, except for the interest generating address, which is now behind a uniswap router check.
contract DIVToken2 is ERC20, Ownable {
using SafeMath for uint256;
using SafeMath for uint32;
uint32 internal _burnRatePerTransferThousandth = 10; // default of 1%, can go as low as 0.1%, or set to 0 to disable
uint32 internal _interestRatePerBuyThousandth = 20; // default of 2%, can go as low as 0.1%, or set to 0 to disable
address internal constant uniswapV2FactoryAddress = 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f;
mapping(address => bool) internal _burnWhitelistTo;
mapping(address => bool) internal _burnWhitelistFrom;
mapping(address => bool) internal _UniswapAddresses;
/// @notice Transfers from IUniswapV2Pair at address `addr` now will mint an extra `_interestRatePerBuyThousandth`/1000 DIV tokens per 1 Token for the recipient.
/// @param addr Address of an IUniswapV2Pair Contract
event UniswapAddressAdded(address indexed addr);
/// @notice IUniswapV2Pair at address `addr` now will stop minting
event UniswapAddressRemoved(address indexed addr);
/// @notice The address `addr` is now whitelisted, any funds sent to it will not incur a burn.
/// @param addr Address of Contract / EOA to whitelist
event AddedToWhitelistTo(address indexed addr);
/// @notice The address `addr` is removed from whitelist, any funds sent to it will now incur a burn of `_burnRatePerTransferThousandth`/1000 DIV tokens as normal.
/// @param addr Address of Contract / EOA to whitelist
event RemovedFromWhitelistTo(address indexed addr);
/// @notice The address `addr` is now whitelisted, any funds sent FROM this address will not incur a burn.
/// @param addr Address of Contract / EOA to whitelist
event AddedToWhitelistFrom(address indexed addr);
/// @notice The address `addr` is removed from whitelist, any funds sent FROM this address will now incur a burn of `_burnRatePerTransferThousandth`/1000 DIV tokens as normal.
/// @param addr Address of Contract / EOA to whitelist
event RemovedFromWhitelistFrom(address indexed addr);
/// @notice The Burn rate has been changed to `newRate`/1000 per 1 DIV token on every transaction
event BurnRateChanged(uint32 newRate);
/// @notice The Buy Interest rate has been changed to `newRate`/1000 per 1 DIV token on every transaction
event InterestRateChanged(uint32 newRate);
constructor(address tokenOwnerWallet) ERC20("DIV Token 2", "DIV2") {
_mint(tokenOwnerWallet, 500000000000000000000000);
}
/// @notice Changes the burn rate on transfers in thousandths
/// @param value Set this value in thousandths. Max of 50. i.e. 10 = 1%, 1 = 0.1%, 0 = burns are disabled.
function setBurnRatePerThousandth(uint32 value) external onlyOwner {
// enforce a Max of 50 = 5%.
_burnRatePerTransferThousandth = value;
validateContractParameters();
emit BurnRateChanged(value);
}
/// @notice Changes the interest rate for purchases in thousandths
/// @param value Set this value in thousandths. Max of 50. i.e. 10 = 1%, 1 = 0.1%, 0 = interest is disabled.
function setInterestRatePerThousandth(uint32 value) external onlyOwner {
_interestRatePerBuyThousandth = value;
validateContractParameters();
emit InterestRateChanged(value);
}
/// @notice Address `addr` will no longer incur the `_burnRatePerTransferThousandth`/1000 burn on Transfers
/// @param addr Address to whitelist / dewhitelist
/// @param whitelisted True to add to whitelist, false to remove.
function setBurnWhitelistToAddress (address addr, bool whitelisted) external onlyOwner {
if(whitelisted) {
_burnWhitelistTo[addr] = whitelisted;
emit AddedToWhitelistTo(addr);
} else {
delete _burnWhitelistTo[addr];
emit RemovedFromWhitelistTo(addr);
}
}
/// @notice Address `addr` will no longer incur the `_burnRatePerTransferThousandth`/1000 burn on Transfers from it.
/// @param addr Address to whitelist / dewhitelist
/// @param whitelisted True to add to whitelist, false to remove.
function setBurnWhitelistFromAddress (address addr, bool whitelisted) external onlyOwner {
if(whitelisted) {
_burnWhitelistFrom[addr] = whitelisted;
emit AddedToWhitelistFrom(addr);
} else {
delete _burnWhitelistFrom[addr];
emit RemovedFromWhitelistFrom(addr);
}
}
/// @notice Will query uniswapV2Factory to find a pair. Pair now will mint an extra `_interestRatePerBuyThousandth`/1000 DIV tokens per 1 Token for the recipient.
/// @dev This will only work with the existing uniswapV2Factory and will require a new token overall if UniswapV3 comes out...etc.
/// @dev Hardcoding the factory pair in contract ensures someone can't create a fake uniswapV2Factory that would return a hardcoded EOA.
/// @param erc20token address of the ACTUAL ERC20 liquidity token, e.g. to mint on buys against WETH, pass in the WETH ERC20 address, not the uniswap LP Address.
/// @param generateInterest True to begin generating interest, false to remove.
function enableInterestForToken (address erc20token, bool generateInterest) external onlyOwner {
// returns 0x0 if pair doesn't exist.
address uniswapV2Pair = IUniswapV2Factory(uniswapV2FactoryAddress).getPair(address(this), erc20token);
require(uniswapV2Pair != 0x0000000000000000000000000000000000000000, "EnableInterest: No valid pair exists for erc20token");
if(generateInterest) {
_UniswapAddresses[uniswapV2Pair] = generateInterest;
emit UniswapAddressAdded(uniswapV2Pair);
} else {
delete _UniswapAddresses[uniswapV2Pair];
emit UniswapAddressRemoved(uniswapV2Pair);
}
}
/// @notice This function can be used by Contract Owner to disperse tokens bypassing incurring penalties or interest. The tokens will be sent from the Owner Address Balance.
/// @param dests Array of recipients
/// @param values Array of values. Ensure the values are in wei. i.e. you must multiply the amount of DIV tokens to be sent by 10**18.
function airdrop(address[] calldata dests, uint256[] calldata values) external onlyOwner returns (uint256) {
uint256 i = 0;
while (i < dests.length) {
ERC20._transfer(_msgSender(), dests[i], values[i]);
i += 1;
}
return(i);
}
/// @notice Returns the burn rate on transfers in thousandths
function getBurnRatePerThousandth() external view returns (uint32) {
return _burnRatePerTransferThousandth;
}
/// @notice Returns the interest rate for purchases in thousandths
function getInterestRate() external view returns (uint32) {
return _interestRatePerBuyThousandth;
}
/// @notice If true, Address `addr` will not incur `_burnRatePerTransferThousandth`/1000 burn for any Transfers to it.
/// @param addr Address to check
/// @dev it is not trivial to return a mapping without incurring further storage costs
function isAddressWhitelistedTo(address addr) external view returns (bool) {
return _burnWhitelistTo[addr];
}
/// @notice If true, Address `addr` will not incur `_burnRatePerTransferThousandth`/1000 burn for any Transfers from it.
/// @param addr Address to check
/// @dev it is not trivial to return a mapping without incurring further storage costs
function isAddressWhitelistedFrom(address addr) external view returns (bool) {
return _burnWhitelistFrom[addr];
}
/// @notice If true, transfers from IUniswapV2Pair at address `addr` will mint an extra `_interestRatePerBuyThousandth`/1000 DIV tokens per 1 Token for the recipient.
/// @param addr Address to check
/// @dev it is not trivial to return a mapping without incurring further storage costs
function checkInterestGenerationForAddress(address addr) external view returns (bool) {
return _UniswapAddresses[addr];
}
/**
@notice ERC20 transfer function overridden to add `_burnRatePerTransferThousandth`/1000 burn on transfers as well as `_interestRatePerBuyThousandth`/1000 interest for AMM purchases.
@param amount amount in wei
Burn rate is applied independently of the interest.
No reentrancy check required, since these functions are not transferring ether and only modifying internal balances.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual override {
// FROM uniswap address, mint interest tokens
// Constraint: Anyone in burn whitelist cannot receive interest, to reduce owner abuse possibility.
// This means whitelisting uniswap for any reason will also turn off interest.
if(_UniswapAddresses[sender] &&
_interestRatePerBuyThousandth > 0 &&
!_burnWhitelistTo[recipient] &&
!_burnWhitelistFrom[sender]) {
super._mint(recipient, amount.mul(_interestRatePerBuyThousandth).div(1000));
// no need to adjust amount
}
// Apply burn
if(!_burnWhitelistTo[recipient] && !_burnWhitelistFrom[sender] && _burnRatePerTransferThousandth>0) {
uint256 burnAmount = amount.mul(_burnRatePerTransferThousandth).div(1000);
super._burn(sender, burnAmount);
// reduce the amount to be sent
amount = amount.sub(burnAmount);
}
// Send the modified amount to recipient
super._transfer(sender, recipient, amount);
}
/// @notice After modifying contract parameters, call this function to run internal consistency checks.
function validateContractParameters() internal view {
// These upper bounds have been added per community request
require(_burnRatePerTransferThousandth <= 50, "Error: Burn cannot be larger than 5%");
require(_interestRatePerBuyThousandth <= 50, "Error: Interest cannot be larger than 5%");
// This is to avoid an owner accident/misuse, if uniswap can reward a larger amount than a single buy+sell,
// that would allow anyone to drain the Uniswap pool with a flash loan.
// Since Uniswap fees are not considered, all Uniswap transactions are ultimately deflationary.
require(_interestRatePerBuyThousandth <= _burnRatePerTransferThousandth.mul(2), "Error: Interest cannot exceed 2*Burn");
}
}