pragma solidity =0.6.6;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
//
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
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 () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
//
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
//
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
//
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
//
/**
* @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 SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
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'
// solhint-disable-next-line max-line-length
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));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @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");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
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// @@@@@@@@@@@@@@@@@@@@@&&&/.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.,*(#&&#*.,,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@&%@@&(,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*%@@@&(*,.,,,,,,,,,,,,,,,,,.(@%@@
// @@@@@@@@@@@@@@&@@%/,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*/#&@@@&#/*,,,,,,,,,,,,,,,,,,,,,,,,,*%&@@
// @@@@@@@@@@@@@%@&,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*/(%@@@%(*,.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*%&@@
// @@@@@@@@@@@@&@#,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.,/%&@@@@&/*,,.,,,,,,,,,,,,,,,,*#/.,,,,,,,,,,,,,,,,*%&@@
// @@@@@@@@@@@@@@#,,,,,,,,,,,,,,,,,,,,,,,,,*#&@@&%%@@@@@(.,,,,,,,,,,,,,,,,,,,,(@(.,,,,,,,,,,,,,,,,*%@&@
// @@@@@@@@@@@@@%&@&%/,,,,,,,,,,,,,,,,,,*#@@&@@@@@@@@@@@%,,,,,,,,,,,,,,,,,,,,*%@/.,,,,,,,,,,,,,,,,.(&&@
// @@@@@@@@@@@@@@@@@&%@@%(///*,......*%@@&&@@@@@@@@@@@@&@&*,,,,,,,,,,,,,,,,,/@&/,,,,,,,,,,,,,,,,,,.(@&@
// @@@@@@@@@@@@@@@@@@@@@&&&&&&&&&&&&&&%@@@@@@@@@@@@@@@@@&&&(,,,,,,,,,,,,,,,(@%*,,,,,,,,,,,,,,,,,,,.*%&@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%@%,,,,,,,,,,,,#@&/.,,,,,,,,,,,,,,,,,.*//(&&@
// $CHADS Vesting Contracts (true CHADS do not dump on their frens) adapted from OZ
// @dev airblush@protonmail.com (virgin@protonmail.com was taken)
contract TokenVesting {
using SafeMath for uint256;
using SafeERC20 for IERC20;
address public immutable beneficiary;
uint256 public immutable cliff;
uint256 public immutable start;
uint256 public immutable duration;
mapping (address => uint256) public released;
event Released(uint256 amount);
constructor(
address _beneficiary,
uint256 _start,
uint256 _cliff,
uint256 _duration
)
public
{
require(_beneficiary != address(0));
require(_cliff <= _duration);
beneficiary = _beneficiary;
duration = _duration;
cliff = _start.add(_cliff);
start = _start;
}
function release(IERC20 _token) external {
uint256 unreleased = releasableAmount(_token);
require(unreleased > 0);
released[address(_token)] = released[address(_token)].add(unreleased);
_token.safeTransfer(beneficiary, unreleased);
emit Released(unreleased);
}
function releasableAmount(IERC20 _token) public view returns (uint256) {
return vestedAmount(_token).sub(released[address(_token)]);
}
function vestedAmount(IERC20 _token) public view returns (uint256) {
uint256 currentBalance = _token.balanceOf(address(this));
uint256 totalBalance = currentBalance.add(released[address(_token)]);
if (block.timestamp < cliff) {
return 0;
} else if (block.timestamp >= start.add(duration)) {
return totalBalance;
} else {
return totalBalance.mul(block.timestamp.sub(start)).div(duration);
}
}
}
// @&#%&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @&@@%&@@&&&&%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@&@(....,*#&@@@&@&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@&/..........*(%@@@&%#%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@&&%*..............,*(#%&@@&&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@&@#......................*#&@@&&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@&%@(..........................,(&@@&%&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@&&@(,.............................*/#@@&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@&@(,.................................*#&@@%&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@&&@#,....................................,/%@@&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@&@#,.......................................,*#&@&&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@&@(............................................,(&@@&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@/...............................................,/#@@@&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@&@(..................................................*#%@@&&@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@&@/......................................................,/&@&@@@@@@@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@%&@/.........................................................,/#%%%&@@@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@%@@(......................................,**/((((((((((((/*,....*(%&@@@@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@#@@*............................,,/%&&@@@@&#(/*,,,,,,,,,,/#&@@%((/*%@@#@@@@@@@@@@@@@@
// @@@@@@@@@@@@@@@&%@#.................,,/#%&@@@@@&%#/*,,,.,,,,,,,,,,,,,,,,,,,,.,,*(%&@@@@@&@@@@@@@@@@@
// @@@@@@@@@@@@@@@@@%@*.........*(#&@@@&%#/*,...,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,..*(&@@%@@@@@@@@@
// @@@@@@@@@@@@@@@@@&&@*....(&@@@%*,..,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,%@&@@@@@@@@
// @@@@@@@@@@@@@@@@@@%@@@@@@@@(,,,,,,,,,,,.....,,,,...,,,,,,,,,,,,,,,,,,,,,,,,(&/.,,,,,,,,,,,*&&&@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@&&@(,,,,,*(%&@@@@@@@@@@@@@@&(,,,,,,,,,,,,,,,,,,,*%@(,,,,,,,,,,,,,,*#@@@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@&@(%@@@@@@&#/*.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,(@(,,,,,,,,,,,,,,,,*%&@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@&@/,,,,./%@@&%/,,,,,,,,,,,,,,,,,,,,,,,,,,.*(#@@(,,,,,,,,,,,,,,,,,,*%@@@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@&@/,,*&@@@%#######(*,,,,,,,,,,,,,,,,,,,,.(@%/*.,,,,,,,,,,,,,,,,,,,.(@%@@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@&@&*/%@@@@@%/%@@@@%(&&&@@&#,,,,,,,,,,,,,,.&@*,,,,,,,,,,,,,,,,,,,,,,.*%@&@@
// @@@@@@@@@@@@@@@@@@@@@@@@@&@%*.*%@&,,#@%//(##(#&/.*#@&*,,,,,,,,,,,,,,,.,,,,,,,,,,,,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@@@@@@@@@@%*,,,.*%&@@@@@@@@@@@@@@&(,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@@@@@@%&@#,,,,,,,,,,**,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@@@@@&@%*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@@@&@&*.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,(%@@@@@&/,,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@#@%.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.*&@%/,,..,*%@#,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@&%@%,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,./@#.,#&%(,.,%@*,,,,,,,,,,,,(@&@@
// @@@@@@@@@@@@@@&&@%.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.*@&*/@(*&%*,#@*,,,,,,,,,,.*&&@@@
// @@@@@@@@@@@@@&@&*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*#%/.,*&%*,#@*,,,,,,,,,,*%&&@@@
// @@@@@@@@@@&&@%/,,,,,,,,(%&&%(,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*/*,,,,,,,,*/*/&%*,#@*,,,,,,,,,,(@&@@@@
// @@@@@@@@@%&@(,,,,,,,,/&%*.,#@(,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,(@@/,,,,,*&@@@#,,,#@*,,,,,,,,,(@@@@@@@
// @@@@@@@@&&%,.,,,,,,,,,,,,,,,(@&(,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*#@%,,,,*(/.,,,./&&*,,,,,,,*%@@@@@@@@
// @@@@@@@@@&@@(*,,,,,,,*#&&&(,,...,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,(@%.,,,,,,/%&&@&/,,,,,,,*&@((@@@@@@
// @@@@@@@@@@@@%&@@@@@@@@&%&@@(,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,%@/.,,,,,,....,,,,,,,.(@%*.*%@@&&%
// @@@@@@@@@@@@@@@@@@@@@@@&@&/,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,&@(.,,,,,,,*,,,,,,,./#/,,.*%@@@@@
// @@@@@@@@@@@@@@@@@@@@&&@@@@&#*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.(@#.,,,,,,/&%*,,,,,,,,,,,,.(@@@@@
// @@@@@@@@@@@@@@@@@%@@%*,,,,,*/,,(%(.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,%@#.,,,,,,,(@#,,,,,,,,,,,,.*%&@@@
// @@@@@@@@@@@@@@@@%@&,,,,,,,,,,,,,#@@/,,,,,,,,,,,,,,,,,,,,,,,,,,,.*(&@#.,,,,,,,./&#,,,,,,,,,,,,.*%&@@@
// @@@@@@@@@@@@@@@@#@&##&@@@@@@@@@@&&@%,,,,,,,,,,,,,,,,,,,,,,,,,*(&@%*,,,,,,,,,,./&#,,,,,,,,,,,,.*%&@@@
// @@@@@@@@@@@@@@@@@@%@@%*,,,,,,,,,,,(/,,,,,,,,,,,,,,,,,,,,,,*%@%/,,,,,,,,,,,,,,./&#,,,,,,,,,,,,.*%&&@@
// @@@@@@@@@@@@@@@@@@&@@@#*,..,,,,,,,,,,,,,,,,,,,,,,,,,,,,,/@&(,,,,,,,,,,,,,,,,,,/&#,,,,,,,,,,,,,,(&&@@
// @@@@@@@@@@@@@@@@@@@@&@@@&@@@@#,,,,,,,,,,,,,,,,,,,,,,,,,,*#/.,,,,,,,,,,,,,,,,,,#@(,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@@@@@&&@(.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*%@%*,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@@@@@&&&/.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.,*(#&&#*.,,,,,,,,,,,,,,.(&&@@
// @@@@@@@@@@@@@@@@@&%@@&(,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*%@@@&(*,.,,,,,,,,,,,,,,,,,.(@%@@
// @@@@@@@@@@@@@@&@@%/,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*/#&@@@&#/*,,,,,,,,,,,,,,,,,,,,,,,,,*%&@@
// @@@@@@@@@@@@@%@&,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*/(%@@@%(*,.,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*%&@@
// @@@@@@@@@@@@&@#,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.,/%&@@@@&/*,,.,,,,,,,,,,,,,,,,*#/.,,,,,,,,,,,,,,,,*%&@@
// @@@@@@@@@@@@@@#,,,,,,,,,,,,,,,,,,,,,,,,,*#&@@&%%@@@@@(.,,,,,,,,,,,,,,,,,,,,(@(.,,,,,,,,,,,,,,,,*%@&@
// @@@@@@@@@@@@@%&@&%/,,,,,,,,,,,,,,,,,,*#@@&@@@@@@@@@@@%,,,,,,,,,,,,,,,,,,,,*%@/.,,,,,,,,,,,,,,,,.(&&@
// @@@@@@@@@@@@@@@@@&%@@%(///*,......*%@@&&@@@@@@@@@@@@&@&*,,,,,,,,,,,,,,,,,/@&/,,,,,,,,,,,,,,,,,,.(@&@
// @@@@@@@@@@@@@@@@@@@@@&&&&&&&&&&&&&&%@@@@@@@@@@@@@@@@@&&&(,,,,,,,,,,,,,,,(@%*,,,,,,,,,,,,,,,,,,,.*%&@
// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%@%,,,,,,,,,,,,#@&/.,,,,,,,,,,,,,,,,,.*//(&&@
// $CHADS Timelock Contract for burn reserves, adapted from OZ
// @dev airblush@protonmail.com (virgin@protonmail.com was taken)
contract TokenTimelock {
using SafeERC20 for IERC20;
address public immutable beneficiary;
uint256 public immutable releaseTime;
constructor(
address _beneficiary,
uint256 _releaseTime
)
public
{
// solium-disable-next-line security/no-block-members
require(_releaseTime > block.timestamp);
beneficiary = _beneficiary;
releaseTime = _releaseTime;
}
function release(IERC20 _token) public {
// solium-disable-next-line security/no-block-members
require(block.timestamp >= releaseTime);
uint256 amount = _token.balanceOf(address(this));
require(amount > 0);
_token.safeTransfer(beneficiary, amount);
}
}
//
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
contract Pausable is Context {
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
bool private _paused;
/**
* @dev Initializes the contract in unpaused state.
*/
constructor () internal {
_paused = false;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
require(!_paused, "Pausable: paused");
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
require(_paused, "Pausable: not paused");
_;
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
//
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) internal _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 internal _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
* called.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
library FixedPoint {
// range: [0, 2**112 - 1]
// resolution: 1 / 2**112
struct uq112x112 {
uint224 _x;
}
// range: [0, 2**144 - 1]
// resolution: 1 / 2**112
struct uq144x112 {
uint _x;
}
uint8 private constant RESOLUTION = 112;
// encode a uint112 as a UQ112x112
function encode(uint112 x) internal pure returns (uq112x112 memory) {
return uq112x112(uint224(x) << RESOLUTION);
}
// encodes a uint144 as a UQ144x112
function encode144(uint144 x) internal pure returns (uq144x112 memory) {
return uq144x112(uint256(x) << RESOLUTION);
}
// divide a UQ112x112 by a uint112, returning a UQ112x112
function div(uq112x112 memory self, uint112 x) internal pure returns (uq112x112 memory) {
require(x != 0, 'FixedPoint: DIV_BY_ZERO');
return uq112x112(self._x / uint224(x));
}
// multiply a UQ112x112 by a uint, returning a UQ144x112
// reverts on overflow
function mul(uq112x112 memory self, uint y) internal pure returns (uq144x112 memory) {
uint z;
require(y == 0 || (z = uint(self._x) * y) / y == uint(self._x), "FixedPoint: MULTIPLICATION_OVERFLOW");
return uq144x112(z);
}
// returns a UQ112x112 which represents the ratio of the numerator to the denominator
// equivalent to encode(numerator).div(denominator)
function fraction(uint112 numerator, uint112 denominator) internal pure returns (uq112x112 memory) {
require(denominator > 0, "FixedPoint: DIV_BY_ZERO");
return uq112x112((uint224(numerator) << RESOLUTION) / denominator);
}
// decode a UQ112x112 into a uint112 by truncating after the radix point
function decode(uq112x112 memory self) internal pure returns (uint112) {
return uint112(self._x >> RESOLUTION);
}
// decode a UQ144x112 into a uint144 by truncating after the radix point
function decode144(uq144x112 memory self) internal pure returns (uint144) {
return uint144(self._x >> RESOLUTION);
}
}
// library with helper methods for oracles that are concerned with computing average prices
library UniswapV2OracleLibrary {
using FixedPoint for *;
// helper function that returns the current block timestamp within the range of uint32, i.e. [0, 2**32 - 1]
function currentBlockTimestamp() internal view returns (uint32) {
return uint32(block.timestamp % 2 ** 32);
}
// produces the cumulative price using counterfactuals to save gas and avoid a call to sync.
function currentCumulativePrices(
address pair
) internal view returns (uint price0Cumulative, uint price1Cumulative, uint32 blockTimestamp) {
blockTimestamp = currentBlockTimestamp();
price0Cumulative = IUniswapV2Pair(pair).price0CumulativeLast();
price1Cumulative = IUniswapV2Pair(pair).price1CumulativeLast();
// if time has elapsed since the last update on the pair, mock the accumulated price values
(uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast) = IUniswapV2Pair(pair).getReserves();
if (blockTimestampLast != blockTimestamp) {
// subtraction overflow is desired
uint32 timeElapsed = blockTimestamp - blockTimestampLast;
// addition overflow is desired
// counterfactual
price0Cumulative += uint(FixedPoint.fraction(reserve1, reserve0)._x) * timeElapsed;
// counterfactual
price1Cumulative += uint(FixedPoint.fraction(reserve0, reserve1)._x) * timeElapsed;
}
}
}
//import "@uniswap/v2-periphery/contracts/libraries/UniswapV2Library.sol";
library UniswapV2Library {
using SafeMath for uint;
// returns sorted token addresses, used to handle return values from pairs sorted in this order
function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
(token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
}
// calculates the CREATE2 address for a pair without making any external calls
function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
(address token0, address token1) = sortTokens(tokenA, tokenB);
pair = address(uint(keccak256(abi.encodePacked(
hex'ff',
factory,
keccak256(abi.encodePacked(token0, token1)),
hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
))));
}
}
// @&#%&@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// @&@@%&@@&&&&%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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// $CHADS (chads.vc)
// @dev airblush@protonmail.com (virgin@protonmail.com was taken)
contract ChadsToken is ERC20, Ownable, Pausable {
using SafeMath for uint256;
/// @notice uniswap listing rate
uint256 public constant INITIAL_TOKENS_PER_ETH = 133_333 * 1 ether;
/// @notice max burn percentage to teach virgins what happens when they sell too early
uint256 public constant BURN_PCT = 50;
/// @notice min burn percentage
uint256 public constant MIN_BURN_PCT = 5;
/// @notice reserve percentage of the burn percentage for rewarding true chads
uint256 public constant BURN_RESERVE_PCT = 49;
/// @notice WETH token address
address public constant WETH = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
/// @notice self-explanatory
address public constant uniswapV2Factory = address(0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f);
address public immutable burnReservesAddress;
address public immutable initialDistributionAddress;
address public immutable teamAddress;
address public immutable devAddress;
address public immutable marketingAddress;
TokenTimelock public burnReservesVault;
TokenVesting public teamVault;
TokenVesting public devVault;
/// @notice liquidity sources (e.g. UniswapV2Router)
mapping(address => bool) public whitelistedSenders;
/// @notice uniswap pair for CHADS/ETH
address public uniswapPair;
/// @notice Whether or not this token is first in uniswap CHADS<>ETH pair
bool public isThisToken0;
/// @notice last TWAP update time
uint32 public blockTimestampLast;
/// @notice last TWAP cumulative price
uint256 public priceCumulativeLast;
/// @notice last TWAP average price
uint256 public priceAverageLast;
/// @notice TWAP min delta (10-min)
uint256 public minDeltaTwap;
event TwapUpdated(uint256 priceCumulativeLast, uint256 blockTimestampLast, uint256 priceAverageLast);
constructor(
uint256 _minDeltaTwap,
address _initialDistributionAddress,
address _burnReservesAddress,
address _teamAddress,
address _devAddress,
address _marketingAddress
)
public
Ownable()
ERC20("chads.vc", "CHADS")
{
setMinDeltaTwap(_minDeltaTwap);
initialDistributionAddress = _initialDistributionAddress;
burnReservesAddress = _burnReservesAddress;
teamAddress = _teamAddress;
devAddress = _devAddress;
marketingAddress = _marketingAddress;
_createBurnReservesVault(_burnReservesAddress);
_distributeTokens(_initialDistributionAddress, _teamAddress, _devAddress, _marketingAddress);
_initializePair();
_pause();
}
modifier whenNotPausedOrInitialDistribution() {
require(!paused() || msg.sender == initialDistributionAddress, "!paused && !initialDistributionAddress");
_;
}
modifier onlyInitialDistributionAddress() {
require(msg.sender == initialDistributionAddress, "!initialDistributionAddress");
_;
}
/**
* @dev Unpauses all transfers from the distribution address (initial liquidity pool).
*/
function unpause() external virtual onlyInitialDistributionAddress {
super._unpause();
}
/**
* @dev Min time elapsed before twap is updated.
*/
function setMinDeltaTwap(uint256 _minDeltaTwap) public onlyOwner {
minDeltaTwap = _minDeltaTwap;
}
/**
* @dev Initializes the TWAP cumulative values for the burn curve.
*/
function initializeTwap() external onlyInitialDistributionAddress {
require(blockTimestampLast == 0, "twap already initialized");
(uint256 price0Cumulative, uint256 price1Cumulative, uint32 blockTimestamp) =
UniswapV2OracleLibrary.currentCumulativePrices(uniswapPair);
uint256 priceCumulative = isThisToken0 ? price1Cumulative : price0Cumulative;
blockTimestampLast = blockTimestamp;
priceCumulativeLast = priceCumulative;
priceAverageLast = INITIAL_TOKENS_PER_ETH;
}
/**
* @dev Sets a whitelisted sender (liquidity sources mostly).
*/
function setWhitelistedSender(address _address, bool _whitelisted) public onlyOwner {
whitelistedSenders[_address] = _whitelisted;
}
function _distributeTokens(
address _initialDistributionAddress,
address _teamAddress,
address _devAddress,
address _marketingAddress
)
internal
{
// Initial Liquidity Pool (28M tokens) + Uniswap Pool (20M tokens)
_mint(address(_initialDistributionAddress), 48 * 1e6 * 1e18);
setWhitelistedSender(_initialDistributionAddress, true);
// Team (3M tokens, 3 months lock + 6 months vesting)
teamVault = new TokenVesting(_teamAddress, block.timestamp, 12 weeks, 24 weeks);
setWhitelistedSender(address(teamVault), true);
_mint(address(teamVault), 3 * 1e6 * 1e18);
// Dapp Development (7M tokens, 2M unlocked, 5M months vesting)
devVault = new TokenVesting(_devAddress, block.timestamp, 0, 24 weeks);
setWhitelistedSender(address(devVault), true);
_mint(_devAddress, 2 * 1e6 * 1e18);
_mint(address(devVault), 5 * 1e6 * 1e18);
// Marketing/ecosystem rewards (11M tokens)
_mint(_marketingAddress, 11 * 1e6 * 1e18);
setWhitelistedSender(_marketingAddress, true);
}
function _createBurnReservesVault(address _burnReservesAddress) internal {
burnReservesVault = new TokenTimelock(_burnReservesAddress, block.timestamp + 2 weeks);
setWhitelistedSender(address(burnReservesVault), true);
}
function _initializePair() internal {
(address token0, address token1) = UniswapV2Library.sortTokens(address(this), address(WETH));
isThisToken0 = (token0 == address(this));
uniswapPair = UniswapV2Library.pairFor(uniswapV2Factory, token0, token1);
setWhitelistedSender(uniswapPair, true);
}
function _isWhitelistedSender(address _sender) internal view returns (bool) {
return whitelistedSenders[_sender];
}
function _updateTwap() internal virtual returns (uint256) {
(uint price0Cumulative, uint price1Cumulative, uint32 blockTimestamp) =
UniswapV2OracleLibrary.currentCumulativePrices(uniswapPair);
uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
if (timeElapsed > minDeltaTwap) {
uint256 priceCumulative = isThisToken0 ? price1Cumulative : price0Cumulative;
// cumulative price is in (uq112x112 price * seconds) units so we simply wrap it after division by time elapsed
FixedPoint.uq112x112 memory priceAverage = FixedPoint.uq112x112(
uint224((priceCumulative - priceCumulativeLast) / timeElapsed)
);
priceCumulativeLast = priceCumulative;
blockTimestampLast = blockTimestamp;
priceAverageLast = FixedPoint.decode144(FixedPoint.mul(priceAverage, 1 ether));
emit TwapUpdated(priceCumulativeLast, blockTimestampLast, priceAverageLast);
}
return priceAverageLast;
}
function _transfer(address sender, address recipient, uint256 amount)
internal
virtual
override
whenNotPausedOrInitialDistribution()
{
if (!_isWhitelistedSender(sender)) {
uint256 scaleFactor = 1e18;
uint256 currentAmountOutPerEth = _updateTwap();
uint256 currentBurnPct = BURN_PCT.mul(scaleFactor);
if (currentAmountOutPerEth < INITIAL_TOKENS_PER_ETH) {
// 50 / (INITIAL_TOKENS_PER_ETH / currentAmountOutPerEth)
scaleFactor = 1e9;
currentBurnPct = currentBurnPct.mul(scaleFactor)
.div(INITIAL_TOKENS_PER_ETH.mul(1e18)
.div(currentAmountOutPerEth));
uint256 minBurnPct = MIN_BURN_PCT * scaleFactor / 10;
currentBurnPct = currentBurnPct > minBurnPct ? currentBurnPct : minBurnPct;
}
uint256 totalBurnAmount = amount.mul(currentBurnPct).div(100).div(scaleFactor);
uint256 burnReserveAmount = totalBurnAmount.mul(BURN_RESERVE_PCT).div(100);
uint256 burnAmount = totalBurnAmount.sub(burnReserveAmount);
super._transfer(sender, address(burnReservesVault), burnReserveAmount);
super._burn(sender, burnAmount);
amount = amount.sub(totalBurnAmount);
}
super._transfer(sender, recipient, amount);
}
function getCurrentTwap() public view returns (uint256) {
(uint price0Cumulative, uint price1Cumulative, uint32 blockTimestamp) =
UniswapV2OracleLibrary.currentCumulativePrices(uniswapPair);
uint32 timeElapsed = blockTimestamp - blockTimestampLast;
uint256 priceCumulative = isThisToken0 ? price1Cumulative : price0Cumulative;
FixedPoint.uq112x112 memory priceAverage = FixedPoint.uq112x112(
uint224((priceCumulative - priceCumulativeLast) / timeElapsed)
);
return FixedPoint.decode144(FixedPoint.mul(priceAverage, 1 ether));
}
function getLastTwap() public view returns (uint256) {
return priceAverageLast;
}
}
{
"compilationTarget": {
"ChadsToken.sol": "ChadsToken"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
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