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ERC-20
Overview
Max Total Supply
68,260.00006826 BTRFLY
Holders
3
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 9 Decimals)
Balance
1 BTRFLYValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Source Code Verified (Exact Match)
Contract Name:
ButterflyERC20Token
Compiler Version
v0.7.5+commit.eb77ed08
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-11-14 */ /** * ┌───┐░░░░┌┐░░░░░┌┐░░░░░┌┐┌───┐░░░░┌┐░░░┌┐░ * │┌─┐│░░░░││░░░░┌┘└┐░░░░│││┌─┐│░░░┌┘└┐░░││░ * │└─┘├──┬─┘├──┬─┴┐┌┼──┬─┘│││░└┼──┬┴┐┌┼──┤│░ * │┌┐┌┤│─┤┌┐│┌┐│┌─┤│││─┤┌┐│││░┌┤┌┐│┌┤│││─┤│░ * │││└┤│─┤└┘│┌┐│└─┤└┤│─┤└┘││└─┘│┌┐│││└┤│─┤└┐ * └┘└─┴──┴──┴┘└┴──┴─┴──┴──┘└───┴┘└┴┘└─┴──┴─┘ */ // SPDX-License-Identifier: AGPL-3.0-or-later pragma solidity 0.7.5; /** * @dev Intended to update the TWAP for a token based on accepting an update call from that token. * expectation is to have this happen in the _beforeTokenTransfer function of ERC20. * Provides a method for a token to register its price sourve adaptor. * Provides a function for a token to register its TWAP updater. Defaults to token itself. * Provides a function a tokent to set its TWAP epoch. * Implements automatic closeing and opening up a TWAP epoch when epoch ends. * Provides a function to report the TWAP from the last epoch when passed a token address. */ interface ITWAPOracle { function uniV2CompPairAddressForLastEpochUpdateBlockTimstamp( address ) external returns ( uint32 ); function priceTokenAddressForPricingTokenAddressForLastEpochUpdateBlockTimstamp( address tokenToPrice_, address tokenForPriceComparison_, uint epochPeriod_ ) external returns ( uint32 ); function pricedTokenForPricingTokenForEpochPeriodForPrice( address, address, uint ) external returns ( uint ); function pricedTokenForPricingTokenForEpochPeriodForLastEpochPrice( address, address, uint ) external returns ( uint ); function updateTWAP( address uniV2CompatPairAddressToUpdate_, uint eopchPeriodToUpdate_ ) external returns ( bool ); } library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping (bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { require(set._values.length > index, "EnumerableSet: index out of bounds"); return set._values[index]; } function _getValues( Set storage set_ ) private view returns ( bytes32[] storage ) { return set_._values; } // TODO needs insert function that maintains order. // TODO needs NatSpec documentation comment. /** * Inserts new value by moving existing value at provided index to end of array and setting provided value at provided index */ function _insert(Set storage set_, uint256 index_, bytes32 valueToInsert_ ) private returns ( bool ) { require( set_._values.length > index_ ); require( !_contains( set_, valueToInsert_ ), "Remove value you wish to insert if you wish to reorder array." ); bytes32 existingValue_ = _at( set_, index_ ); set_._values[index_] = valueToInsert_; return _add( set_, existingValue_); } struct Bytes4Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes4Set storage set, bytes4 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes4Set storage set, bytes4 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes4Set storage set, bytes4 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values on the set. O(1). */ function length(Bytes4Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes4Set storage set, uint256 index) internal view returns ( bytes4 ) { return bytes4( _at( set._inner, index ) ); } function getValues( Bytes4Set storage set_ ) internal view returns ( bytes4[] memory ) { bytes4[] memory bytes4Array_; for( uint256 iteration_ = 0; _length( set_._inner ) > iteration_; iteration_++ ) { bytes4Array_[iteration_] = bytes4( _at( set_._inner, iteration_ ) ); } return bytes4Array_; } function insert( Bytes4Set storage set_, uint256 index_, bytes4 valueToInsert_ ) internal returns ( bool ) { return _insert( set_._inner, index_, valueToInsert_ ); } struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values on the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns ( bytes32 ) { return _at(set._inner, index); } function getValues( Bytes32Set storage set_ ) internal view returns ( bytes4[] memory ) { bytes4[] memory bytes4Array_; for( uint256 iteration_ = 0; _length( set_._inner ) >= iteration_; iteration_++ ){ bytes4Array_[iteration_] = bytes4( at( set_, iteration_ ) ); } return bytes4Array_; } function insert( Bytes32Set storage set_, uint256 index_, bytes32 valueToInsert_ ) internal returns ( bool ) { return _insert( set_._inner, index_, valueToInsert_ ); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(value))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(value))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(value))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint256(_at(set._inner, index))); } /** * TODO Might require explicit conversion of bytes32[] to address[]. * Might require iteration. */ function getValues( AddressSet storage set_ ) internal view returns ( address[] memory ) { address[] memory addressArray; for( uint256 iteration_ = 0; _length(set_._inner) >= iteration_; iteration_++ ){ addressArray[iteration_] = at( set_, iteration_ ); } return addressArray; } function insert(AddressSet storage set_, uint256 index_, address valueToInsert_ ) internal returns ( bool ) { return _insert( set_._inner, index_, bytes32(uint256(valueToInsert_)) ); } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } struct UInt256Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UInt256Set storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UInt256Set storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UInt256Set storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UInt256Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UInt256Set storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } } 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); } 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; } // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method) function sqrrt(uint256 a) internal pure returns (uint c) { if (a > 3) { c = a; uint b = add( div( a, 2), 1 ); while (b < c) { c = b; b = div( add( div( a, b ), b), 2 ); } } else if (a != 0) { c = 1; } } /* * Expects percentage to be trailed by 00, */ function percentageAmount( uint256 total_, uint8 percentage_ ) internal pure returns ( uint256 percentAmount_ ) { return div( mul( total_, percentage_ ), 1000 ); } /* * Expects percentage to be trailed by 00, */ function substractPercentage( uint256 total_, uint8 percentageToSub_ ) internal pure returns ( uint256 result_ ) { return sub( total_, div( mul( total_, percentageToSub_ ), 1000 ) ); } function percentageOfTotal( uint256 part_, uint256 total_ ) internal pure returns ( uint256 percent_ ) { return div( mul(part_, 100) , total_ ); } /** * Taken from Hypersonic https://github.com/M2629/HyperSonic/blob/main/Math.sol * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow, so we distribute return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2); } function quadraticPricing( uint256 payment_, uint256 multiplier_ ) internal pure returns (uint256) { return sqrrt( mul( multiplier_, payment_ ) ); } function bondingCurve( uint256 supply_, uint256 multiplier_ ) internal pure returns (uint256) { return mul( multiplier_, supply_ ); } } abstract contract ERC20 is IERC20 { using SafeMath for uint256; // TODO comment actual hash value. bytes32 constant private ERC20TOKEN_ERC1820_INTERFACE_ID = keccak256( "ERC20Token" ); // Present in ERC777 mapping (address => uint256) internal _balances; // Present in ERC777 mapping (address => mapping (address => uint256)) internal _allowances; // Present in ERC777 uint256 internal _totalSupply; // Present in ERC777 string internal _name; // Present in ERC777 string internal _symbol; // Present in ERC777 uint8 internal _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_, uint8 decimals_) { _name = name_; _symbol = symbol_; _decimals = decimals_; } /** * @dev Returns the name of the token. */ // Present in ERC777 function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ // Present in ERC777 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}. */ // Present in ERC777 function decimals() public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ // Present in ERC777 function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ // Present in ERC777 function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ // Overrideen in ERC777 // Confirm that this behavior changes function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(msg.sender, recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ // Present in ERC777 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. */ // Present in ERC777 function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(msg.sender, 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`. */ // Present in ERC777 function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, msg.sender, _allowances[sender][msg.sender].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(msg.sender, spender, _allowances[msg.sender][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(msg.sender, spender, _allowances[msg.sender][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. */ // Present in ERC777 function _mint(address account_, uint256 amount_) internal virtual { require(account_ != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address( this ), account_, amount_); _totalSupply = _totalSupply.add(amount_); _balances[account_] = _balances[account_].add(amount_); emit Transfer(address( this ), 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. */ // Present in ERC777 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. */ // Present in ERC777 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. */ // Considering deprication to reduce size of bytecode as changing _decimals to internal acheived the same functionality. // 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]. */ // Present in ERC777 function _beforeTokenTransfer( address from_, address to_, uint256 amount_ ) internal virtual { } } library Counters { using SafeMath for uint256; struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { // The {SafeMath} overflow check can be skipped here, see the comment at the top counter._value += 1; } function decrement(Counter storage counter) internal { counter._value = counter._value.sub(1); } } interface IERC2612Permit { /** * @dev Sets `amount` 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: * * - `owner` cannot be the zero address. * - `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 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current ERC2612 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); } abstract contract ERC20Permit is ERC20, IERC2612Permit { using Counters for Counters.Counter; mapping(address => Counters.Counter) private _nonces; // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; bytes32 public DOMAIN_SEPARATOR; constructor() { uint256 chainID; assembly { chainID := chainid() } DOMAIN_SEPARATOR = keccak256( abi.encode( keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), keccak256(bytes(name())), keccak256(bytes("1")), // Version chainID, address(this) ) ); } /** * @dev See {IERC2612Permit-permit}. * */ function permit( address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual override { require(block.timestamp <= deadline, "Permit: expired deadline"); bytes32 hashStruct = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, amount, _nonces[owner].current(), deadline)); bytes32 _hash = keccak256(abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct)); address signer = ecrecover(_hash, v, r, s); require(signer != address(0) && signer == owner, "ZeroSwapPermit: Invalid signature"); _nonces[owner].increment(); _approve(owner, spender, amount); } /** * @dev See {IERC2612Permit-nonces}. */ function nonces(address owner) public view override returns (uint256) { return _nonces[owner].current(); } } interface IOwnable { function owner() external view returns (address); function renounceOwnership() external; function transferOwnership( address newOwner_ ) external; } contract Ownable is IOwnable { address internal _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor () { _owner = msg.sender; emit OwnershipTransferred( address(0), _owner ); } /** * @dev Returns the address of the current owner. */ function owner() public view override returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require( _owner == msg.sender, "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 override 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 override onlyOwner() { require( newOwner_ != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred( _owner, newOwner_ ); _owner = newOwner_; } } contract VaultOwned is Ownable { address internal _vault; function setVault( address vault_ ) external onlyOwner() returns ( bool ) { _vault = vault_; return true; } /** * @dev Returns the address of the current vault. */ function vault() public view returns (address) { return _vault; } /** * @dev Throws if called by any account other than the vault. */ modifier onlyVault() { require( _vault == msg.sender, "VaultOwned: caller is not the Vault" ); _; } } contract TWAPOracleUpdater is ERC20Permit, VaultOwned { using EnumerableSet for EnumerableSet.AddressSet; event TWAPOracleChanged( address indexed previousTWAPOracle, address indexed newTWAPOracle ); event TWAPEpochChanged( uint previousTWAPEpochPeriod, uint newTWAPEpochPeriod ); event TWAPSourceAdded( address indexed newTWAPSource ); event TWAPSourceRemoved( address indexed removedTWAPSource ); EnumerableSet.AddressSet private _dexPoolsTWAPSources; ITWAPOracle public twapOracle; uint public twapEpochPeriod; constructor( string memory name_, string memory symbol_, uint8 decimals_ ) ERC20(name_, symbol_, decimals_) { } function changeTWAPOracle( address newTWAPOracle_ ) external onlyOwner() { emit TWAPOracleChanged( address(twapOracle), newTWAPOracle_); twapOracle = ITWAPOracle( newTWAPOracle_ ); } function changeTWAPEpochPeriod( uint newTWAPEpochPeriod_ ) external onlyOwner() { require( newTWAPEpochPeriod_ > 0, "TWAPOracleUpdater: TWAP Epoch period must be greater than 0." ); emit TWAPEpochChanged( twapEpochPeriod, newTWAPEpochPeriod_ ); twapEpochPeriod = newTWAPEpochPeriod_; } function addTWAPSource( address newTWAPSourceDexPool_ ) external onlyOwner() { require( _dexPoolsTWAPSources.add( newTWAPSourceDexPool_ ), "ButterflyERC20Token: TWAP Source already stored." ); emit TWAPSourceAdded( newTWAPSourceDexPool_ ); } function removeTWAPSource( address twapSourceToRemove_ ) external onlyOwner() { require( _dexPoolsTWAPSources.remove( twapSourceToRemove_ ), "ButterflyERC20Token: TWAP source not present." ); emit TWAPSourceRemoved( twapSourceToRemove_ ); } function _uodateTWAPOracle( address dexPoolToUpdateFrom_, uint twapEpochPeriodToUpdate_ ) internal { if ( _dexPoolsTWAPSources.contains( dexPoolToUpdateFrom_ )) { twapOracle.updateTWAP( dexPoolToUpdateFrom_, twapEpochPeriodToUpdate_ ); } } function _beforeTokenTransfer( address from_, address to_, uint256 amount_ ) internal override virtual { if( _dexPoolsTWAPSources.contains( from_ ) ) { _uodateTWAPOracle( from_, twapEpochPeriod ); } else { if ( _dexPoolsTWAPSources.contains( to_ ) ) { _uodateTWAPOracle( to_, twapEpochPeriod ); } } } } contract Divine is TWAPOracleUpdater { constructor( string memory name_, string memory symbol_, uint8 decimals_ ) TWAPOracleUpdater(name_, symbol_, decimals_) { } } contract ButterflyERC20Token is Divine { using SafeMath for uint256; constructor() Divine("Butterfly", "BTRFLY", 9) { } function mint(address account_, uint256 amount_) external onlyVault() { _mint(account_, amount_); } /** * @dev Destroys `amount` tokens from the caller. * * See {ERC20-_burn}. */ function burn(uint256 amount) public virtual { _burn(msg.sender, amount); } // function _beforeTokenTransfer( address from_, address to_, uint256 amount_ ) internal override virtual { // if( _dexPoolsTWAPSources.contains( from_ ) ) { // _uodateTWAPOracle( from_, twapEpochPeriod ); // } else { // if ( _dexPoolsTWAPSources.contains( to_ ) ) { // _uodateTWAPOracle( to_, twapEpochPeriod ); // } // } // } /* * @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 { _burnFrom(account_, amount_); } function _burnFrom(address account_, uint256 amount_) public virtual { uint256 decreasedAllowance_ = allowance(account_, msg.sender).sub( amount_, "ERC20: burn amount exceeds allowance" ); _approve(account_, msg.sender, decreasedAllowance_); _burn(account_, amount_); } }
Contract Security Audit
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Contract Creation Code
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Swarm Source
ipfs://3cec6ebe0ac7f749f3d075b0775c0c2220036c92959085c1ca95cea918957433
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