Contract Source Code:
File 1 of 1 : RuniSwap
/**
*/
// Sources flattened with hardhat v2.19.1 https://hardhat.org
// SPDX-License-Identifier: MIT
// File @openzeppelin/contracts/utils/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
// https://runiswap.org/
// https://t.me/RuniSwapDEX
// https://twitter.com/RuniSwapDEX
pragma solidity ^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.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// File @openzeppelin/contracts/access/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
/**
* @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() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
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.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(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"
);
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// File @openzeppelin/contracts/token/ERC20/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @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);
}
// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
/**
* @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);
}
// File @openzeppelin/contracts/token/ERC20/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
/**
* @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 {}
}
// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)
pragma solidity ^0.8.0;
/**
* @dev Extension of {ERC20} that allows token holders to destroy both their own
* tokens and those that they have an allowance for, in a way that can be
* recognized off-chain (via event analysis).
*/
abstract contract ERC20Burnable is Context, ERC20 {
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) public virtual {
_burn(_msgSender(), amount);
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
*
* See {ERC20-_burn} and {ERC20-allowance}.
*
* Requirements:
*
* - the caller must have allowance for ``accounts``'s tokens of at least
* `amount`.
*/
function burnFrom(address account, uint256 amount) public virtual {
_spendAllowance(account, _msgSender(), amount);
_burn(account, amount);
}
}
// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)
pragma solidity ^0.8.0;
/**
* @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);
}
// File @openzeppelin/contracts/utils/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @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);
}
}
}
// File @openzeppelin/contracts/token/ERC20/utils/[email protected]
// Original license: SPDX_License_Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
/**
* @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));
}
}
// File contracts/token/AntiBotHelper.sol
// Original license: SPDX_License_Identifier: MIT
pragma solidity ^0.8.0;
/**
* @notice Anti-Bot Helper
* Max TX Amount feature
* Max Wallet Amount feature
*/
abstract contract AntiBotHelper is Ownable {
/// @dev Minimum value that can be set for the max transaction limit - 0.25%
uint16 private constant MIN__MAX_TX_LIMIT = 25;
/// @dev Maximum value that can be set for the max transaction limit - 100%
uint16 private constant MAX__MAX_TX_LIMIT = 10000;
/// @dev Minimum value that can be set for the max hold limit - 0.25%
uint16 private constant MIN__MAX_HOLD_LIMIT = 25;
/// @dev Maximum value that can be set for the max hold limit - 100%
uint16 private constant MAX__MAX_HOLD_LIMIT = 10000;
uint16 internal _maxTxLimit = 200; // default 2%
uint16 internal _maxHoldLimit = 200; // default 2%
/// @dev trading enabled flag. default false
bool internal _tradingEnabled;
mapping(address => bool) internal _isExcludedFromTxLimit;
mapping(address => bool) internal _isExcludedFromHoldLimit;
event ExcludedFromHoldLimit(address account, bool flag);
event ExcludedFromTxLimit(address account, bool flag);
event MaxLimitUpdated(uint16 maxHoldLimit, uint16 maxTxLimit);
event TradingEnabled();
/// @notice Exclude / Include the multiple accounts from max tx limit
/// @dev Only callable by owner
function batchExcludeFromTxLimit(
address[] calldata accounts,
bool flag
) external onlyOwner {
uint256 len = accounts.length;
for (uint256 i; i < len; ) {
address account = accounts[i];
_isExcludedFromTxLimit[account] = flag;
unchecked {
++i;
}
emit ExcludedFromTxLimit(account, flag);
}
}
/// @notice Exclude / Include the multiple accounts from max wallet limit
/// @dev Only callable by owner
function batchExcludeFromHoldLimit(
address[] calldata accounts,
bool flag
) external onlyOwner {
uint256 len = accounts.length;
for (uint256 i; i < len; ) {
address account = accounts[i];
_isExcludedFromHoldLimit[account] = flag;
unchecked {
++i;
}
emit ExcludedFromHoldLimit(account, flag);
}
}
/// @notice Check if the account is excluded from max hold & wallet limit
/// @return bool excluded from max hold limit
/// @return bool excluded from max tx limit
function isExcludedFromLimit(
address account
) external view returns (bool, bool) {
return (
_isExcludedFromHoldLimit[account],
_isExcludedFromTxLimit[account]
);
}
/// @notice Update max hold limit & max tx limit
/// @param holdLimit new max hold limit
/// @param txLimit new max tx limit
function updateMaxLimit(
uint16 holdLimit,
uint16 txLimit
) external onlyOwner {
require(holdLimit >= txLimit, "tx limit exceeds hold limit");
require(
_maxHoldLimit <= holdLimit && _maxTxLimit <= txLimit,
"increase only"
);
require(txLimit <= MAX__MAX_TX_LIMIT, "tx limit out of range");
require(holdLimit <= MAX__MAX_HOLD_LIMIT, "hold limit out of range");
_maxHoldLimit = holdLimit;
_maxTxLimit = txLimit;
emit MaxLimitUpdated(holdLimit, txLimit);
}
/// @notice View max hold limit & max tx limit
/// @return uint16 max hold limit percent
/// @return uint16 max tx limit percent
function maxLimit() external view returns (uint16, uint16) {
return (_maxHoldLimit, _maxTxLimit);
}
/// @notice Enable trading
function enableTrading() external onlyOwner {
require(!_tradingEnabled, "already enabled");
_tradingEnabled = true;
emit TradingEnabled();
}
/// @notice Check if the trading is enabled now
function isTradingEnabled() external view returns (bool) {
return _tradingEnabled;
}
}
// File contracts/interfaces/IUniswapAmm.sol
// Original license: SPDX_License_Identifier: MIT
// File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol
pragma solidity ^0.8.4;
interface IUniswapV2Factory {
event PairCreated(
address indexed token0,
address indexed token1,
address pair,
uint256
);
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(uint256) external view returns (address pair);
function allPairsLength() external view returns (uint256);
function createPair(
address tokenA,
address tokenB
) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
// File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol
interface IUniswapV2Pair {
event Approval(
address indexed owner,
address indexed spender,
uint256 value
);
event Transfer(address indexed from, address indexed to, uint256 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 (uint256);
function balanceOf(address owner) external view returns (uint256);
function allowance(
address owner,
address spender
) external view returns (uint256);
function approve(address spender, uint256 value) external returns (bool);
function transfer(address to, uint256 value) external returns (bool);
function transferFrom(
address from,
address to,
uint256 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 (uint256);
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
event Mint(address indexed sender, uint256 amount0, uint256 amount1);
event Burn(
address indexed sender,
uint256 amount0,
uint256 amount1,
address indexed to
);
event Swap(
address indexed sender,
uint256 amount0In,
uint256 amount1In,
uint256 amount0Out,
uint256 amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint256);
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 (uint256);
function price1CumulativeLast() external view returns (uint256);
function kLast() external view returns (uint256);
function mint(address to) external returns (uint256 liquidity);
function burn(
address to
) external returns (uint256 amount0, uint256 amount1);
function swap(
uint256 amount0Out,
uint256 amount1Out,
address to,
bytes calldata data
) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router01.sol
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETH(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountToken, uint256 amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETHWithPermit(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountToken, uint256 amountETH);
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function swapTokensForExactETH(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) external pure returns (uint256 amountB);
function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountOut);
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountIn);
function getAmountsOut(
uint256 amountIn,
address[] calldata path
) external view returns (uint256[] memory amounts);
function getAmountsIn(
uint256 amountOut,
address[] calldata path
) external view returns (uint256[] memory amounts);
}
// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
}
// File contracts/token/TaxHelper.sol
// Original license: SPDX_License_Identifier: MIT
pragma solidity ^0.8.0;
/**
* @notice Tax Helper
* Marketing fee
* Burn fee
* Fee in buy/sell/transfer separately
*/
abstract contract TaxHelper is Ownable {
/// @dev Max buy tax after token launched. 10%
uint16 private constant MAX_BUY_TAX_AFTER = 1000;
/// @dev Max sell tax after token launched. 20%
uint16 private constant MAX_SELL_TAX_AFTER = 2000;
/// @dev Project tax is set on top buy / sell tax as a service fee. 15%
uint16 internal constant PROJECT_TAX = 1500;
/// @dev Project tax is removed after 30 days
uint256 internal constant PROJECT_TAX_PERIOD = 30 days;
/// @dev Project tax receive wallet
address payable internal constant PROJECT_WALLET =
payable(0xD4E2F9c563021CBb5f5D7Fc00d543ED7C4775deF);
bool internal _projectTaxApplied = true;
/// @dev Buy tax default 25%
uint16 internal _buyTax = 2500;
/// @dev Sell tax default 35%
uint16 internal _sellTax = 3500;
address payable internal _marketingWallet;
mapping(address => bool) internal _isExcludedFromTax;
mapping(address => bool) internal _isAmmPair;
event ExcludedFromTax(address account, bool flag);
event MarketingWalletUpdated(address marketingWallet);
event NewAmmPair(address pair, bool flag);
event TaxesUpdated(uint16 buyTax, uint16 sellTax);
/// @notice Update buy / sell / treasury tax
/// @dev new tax values should not be greater than the `taxAfterLimit`
/// @param buyTax new buy tax value
/// @param sellTax new sell tax value
function updateTaxes(uint16 buyTax, uint16 sellTax) external onlyOwner {
// gas-saving code
uint16 buyTax_ = _buyTax;
uint16 sellTax_ = _sellTax;
if (buyTax > buyTax_)
require(buyTax <= MAX_BUY_TAX_AFTER, "invalid buyTax");
if (sellTax > sellTax_)
require(sellTax <= MAX_SELL_TAX_AFTER, "invalid sellTax");
_buyTax = buyTax;
_sellTax = sellTax;
emit TaxesUpdated(buyTax, sellTax);
}
/// @notice View taxes applied to the token
/// @return uint16 {_buyTax}
/// @return uint16 {_sellTax}
function taxes() external view returns (uint16, uint16) {
return (_buyTax, _sellTax);
}
/// @notice Update marketing wallet
function updateMarketingWallet(
address payable newWallet
) external onlyOwner {
require(_marketingWallet != newWallet, "nothing changed");
require(newWallet != address(0), "invalid wallet");
_marketingWallet = newWallet;
emit MarketingWalletUpdated(newWallet);
}
/// @notice View current marketing wallet
function marketingWallet() external view returns (address payable) {
return _marketingWallet;
}
/// @notice Exclude / Include the multiple accounts from tax
/// @dev Only callable by owner
function batchExcludeFromTax(
address[] calldata accounts,
bool flag
) external onlyOwner {
uint256 len = accounts.length;
for (uint256 i; i < len; ) {
address account = accounts[i];
_isExcludedFromTax[account] = flag;
unchecked {
++i;
}
emit ExcludedFromTax(account, flag);
}
}
/// @notice Check if the account is excluded from the fees
/// @param account: the account to be checked
function isExcludedFromTax(address account) external view returns (bool) {
return _isExcludedFromTax[account];
}
/// @notice Check if the {pair} is AMM pair
function isAmmPair(address pair) external view returns (bool) {
return _isAmmPair[pair];
}
/**
* @dev function {taxLimits}
*
* Return tax limits compared with current value and taxAfterLimits
*
* @return uint16 max buy tax limit
* @return uint16 max sell tax limit
*/
function taxLimits() external view returns (uint16, uint16) {
uint16 maxBuyTax = _buyTax < MAX_BUY_TAX_AFTER
? MAX_BUY_TAX_AFTER
: _buyTax;
uint16 maxSellTax = _sellTax < MAX_SELL_TAX_AFTER
? MAX_SELL_TAX_AFTER
: _sellTax;
return (maxBuyTax, maxSellTax);
}
}
// File contracts/token/TokenERC20Base.sol
// Original license: SPDX_License_Identifier: MIT
pragma solidity ^0.8.0;
contract TokenERC20Base is AntiBotHelper, TaxHelper, ERC20Burnable {
using Address for address payable;
uint16 internal constant DENOMINATOR = 10000;
// default threshold would be 0.25% of the total supply
uint16 private constant DEFAULT_THRESHOLD = 25;
address public immutable uniswapV2Router;
address public immutable ethPair;
bool internal _isTaxConvertEnabled = true;
uint256 public firstBuyAt;
/// @dev Threshold amount of accumlated tax until swap to pair token
uint256 internal _thresholdAmount;
constructor(
string memory name_,
string memory symbol_,
uint256 supply_,
address router_,
address payable marketingWallet_
) ERC20(name_, symbol_) {
// check if marketing account can receive ETH
marketingWallet_.sendValue(0);
// pair with ETH
address lpPair = IUniswapV2Factory(
IUniswapV2Router02(router_).factory()
).createPair(address(this), IUniswapV2Router02(router_).WETH());
uniswapV2Router = router_;
ethPair = lpPair;
_marketingWallet = marketingWallet_;
_isAmmPair[lpPair] = true;
_isExcludedFromHoldLimit[lpPair] = true;
// threshold amount is 0.05% of the total supply
_thresholdAmount = (supply_ * DEFAULT_THRESHOLD) / DENOMINATOR;
_isExcludedFromTxLimit[_msgSender()] = true;
_isExcludedFromTxLimit[address(0)] = true;
_isExcludedFromTxLimit[address(0xdead)] = true;
_isExcludedFromTxLimit[address(this)] = true;
_isExcludedFromHoldLimit[_msgSender()] = true;
_isExcludedFromHoldLimit[address(0)] = true;
_isExcludedFromHoldLimit[address(0xdead)] = true;
_isExcludedFromHoldLimit[address(this)] = true;
_isExcludedFromTax[_msgSender()] = true;
_isExcludedFromTax[address(0)] = true;
_isExcludedFromTax[address(0xdead)] = true;
_isExcludedFromTax[address(this)] = true;
// Mint the tokens to the token deployer
_mint(_msgSender(), supply_);
}
/**
* @notice function {batchSetAsAmmPair}
*
* Set / unset multiple pair addresses as AMM pair
* LP addresses should be excluded from hold limit
*
* @param pairs lp addresses
* @param flag true / false
*/
function batchSetAsAmmPair(
address[] calldata pairs,
bool flag
) external onlyOwner {
uint256 len = pairs.length;
for (uint256 i; i < len; ) {
address pair = pairs[i];
require(pair != ethPair, "can not access base eth pair");
_isAmmPair[pair] = flag;
_isExcludedFromHoldLimit[pair] = flag;
unchecked {
++i;
}
emit NewAmmPair(pair, flag);
}
}
/// @notice Enable conversion of token tax
function enableTaxConvert(bool flag) external onlyOwner {
_isTaxConvertEnabled = flag;
}
function isTaxConvertEnabled() external view returns (bool) {
return _isTaxConvertEnabled;
}
/// @notice Update the threshold amount for the swapping to occur
/// @dev Too small value will cause sell tx happens in every tx
function updateThresholdAmount(uint256 amount) external onlyOwner {
require(amount > 0, "invalid threshold");
_thresholdAmount = amount;
}
function thresholdAmount() external view returns (uint256) {
return _thresholdAmount;
}
}
// File contracts/token/TokenERC20.sol
// Original license: SPDX_License_Identifier: MIT
pragma solidity ^0.8.0;
contract RuniSwap is TokenERC20Base {
using Address for address payable;
using SafeERC20 for IERC20;
bool private _inSwap;
modifier lockTheSwap() {
_inSwap = true;
_;
_inSwap = false;
}
constructor(
address payable marketingWallet_
)
TokenERC20Base(
"RuniSwap",
"RS",
100_000_000_000 ether,
0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D,
marketingWallet_
)
{}
/**
* @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 override {
uint256 totalSupply_ = totalSupply();
// Check if trading is enabled
address owner_ = owner();
require(
_tradingEnabled || owner_ == from || owner_ == to,
"trading disabled"
);
// Check max tx limit
require(
_isExcludedFromTxLimit[from] ||
_isExcludedFromTxLimit[to] ||
amount <= (totalSupply_ * _maxTxLimit) / DENOMINATOR,
"tx amount limited"
);
// Check max wallet amount limit
require(
_isExcludedFromHoldLimit[to] ||
balanceOf(to) <= (totalSupply_ * _maxHoldLimit) / DENOMINATOR,
"receiver hold limited"
);
}
function _transfer(
address from,
address to,
uint256 amount
) internal override {
uint256 blockTime = block.timestamp;
// is the token balance of this contract address over the min number of
// tokens that we need to initiate a swap + liquidity lock?
// also, don't get caught in a circular liquidity event.
// also, don't swap & liquify if sender is uniswap pair.
uint256 contractTokenBalance = balanceOf(address(this));
bool isWhitelisted = _isExcludedFromTax[from] || _isExcludedFromTax[to];
bool isBuyTx = _isAmmPair[from];
bool isSellTx = _isAmmPair[to];
// swap accumlated tax into ETH or USDC
if (
!_inSwap &&
!isWhitelisted &&
!isBuyTx &&
_isTaxConvertEnabled &&
contractTokenBalance >= _thresholdAmount
) {
// although the project tax period is finished, there may still be accumulated taxes thus far.
// in this case, we will swap all those taxes into ETH.
bool isProjectTaxOverTime = _projectTaxApplied &&
firstBuyAt > 0 &&
blockTime > firstBuyAt + PROJECT_TAX_PERIOD;
// when the physicsico fee period is over, swap all accumlated taxes
if (isProjectTaxOverTime) _swapToPairedToken(contractTokenBalance);
else _swapToPairedToken(_thresholdAmount);
if (isProjectTaxOverTime) _projectTaxApplied = false;
}
if (amount == 0) {
super._transfer(from, to, 0);
return;
}
uint256 fees;
if (!isWhitelisted) {
if (isBuyTx) {
// project tax is applied on top of buy tax for 30 days
// its 15% of buy tax
if (firstBuyAt == 0) firstBuyAt = block.timestamp;
if (
_projectTaxApplied &&
blockTime <= firstBuyAt + PROJECT_TAX_PERIOD
)
fees =
(amount * _buyTax * (DENOMINATOR + PROJECT_TAX)) /
DENOMINATOR /
DENOMINATOR;
else fees = (amount * _buyTax) / DENOMINATOR;
} else if (isSellTx) {
// project tax is applied on top of sell tax for 30 days
// its 15% of buy tax
if (
_projectTaxApplied &&
(firstBuyAt == 0 ||
blockTime <= firstBuyAt + PROJECT_TAX_PERIOD)
)
fees =
(amount * _sellTax * (DENOMINATOR + PROJECT_TAX)) /
DENOMINATOR /
DENOMINATOR;
else fees = (amount * _sellTax) / DENOMINATOR;
}
if (fees > 0) super._transfer(from, address(this), fees);
amount -= fees;
}
super._transfer(from, to, amount);
}
/**
* @dev Swap token accumlated in this contract to the base paired token
*
* According to the paired token
* - when paired token is ETH, swapToETH function is called
* - when paired token is another token, swapToToken is called
*/
function _swapToPairedToken(uint256 amount) private lockTheSwap {
uint256 swappedAmount = _swapToETH(amount);
if (swappedAmount > 0) {
// send project tax
if (_projectTaxApplied) {
uint256 projectTaxAmount = (swappedAmount * PROJECT_TAX) /
(DENOMINATOR + PROJECT_TAX);
PROJECT_WALLET.sendValue(projectTaxAmount);
swappedAmount -= projectTaxAmount;
}
// send buy/sell tax
_marketingWallet.sendValue(swappedAmount);
}
}
function _swapToETH(uint256 amount) private returns (uint256) {
IUniswapV2Router02 dexRouter = IUniswapV2Router02(uniswapV2Router);
// generate the uniswap pair path of token -> eth
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = dexRouter.WETH();
_approve(address(this), address(dexRouter), amount);
uint256 balanceBefore = address(this).balance;
// make the swap
try
dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
amount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp + 300
)
{
return address(this).balance - balanceBefore;
} catch (bytes memory /* lowLevelData */) {}
return 0;
}
receive() external payable {}
/**
* @dev It allows the admin to recover tokens sent to the contract
* @param token_: the address of the token to withdraw
* @param amount_: the number of tokens to withdraw
*
* This function is only callable by owner
*/
function recoverToken(address token_, uint256 amount_) external onlyOwner {
require(token_ != address(this), "Not allowed token");
IERC20(token_).safeTransfer(_msgSender(), amount_);
}
}