// Dependency file: @openzeppelin/contracts/math/SafeMath.sol
// SPDX-License-Identifier: MIT
// pragma solidity >=0.6.0 <0.8.0;
/**
* @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, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a / b);
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a % b);
}
/**
* @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) {
require(b <= a, "SafeMath: subtraction overflow");
return a - b;
}
/**
* @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) {
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, reverting 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) {
require(b > 0, "SafeMath: division by zero");
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting 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) {
require(b > 0, "SafeMath: modulo by zero");
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* 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);
return a - b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* 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);
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* 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;
}
}
// Dependency file: @openzeppelin/contracts/utils/Address.sol
// pragma solidity >=0.6.2 <0.8.0;
/**
* @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) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://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");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
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);
}
}
}
}
// Dependency file: @openzeppelin/contracts/utils/ReentrancyGuard.sol
// pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// Dependency file: contracts/libraries/TransferHelper.sol
// pragma solidity >=0.6.5 <0.8.0;
library TransferHelper {
function safeApprove(address token, address to, uint value) internal {
// bytes4(keccak256(bytes('approve(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
}
function safeTransfer(address token, address to, uint value) internal {
// bytes4(keccak256(bytes('transfer(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
}
function safeTransferFrom(address token, address from, address to, uint value) internal {
// bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
}
function safeTransferETH(address to, uint value) internal {
(bool success,) = to.call{value:value}(new bytes(0));
require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
}
}
// Dependency file: contracts/libraries/Upgradable.sol
// pragma solidity >=0.6.5 <0.8.0;
contract UpgradableProduct {
address public impl;
event ImplChanged(address indexed _oldImpl, address indexed _newImpl);
constructor() public {
impl = msg.sender;
}
modifier requireImpl() {
require(msg.sender == impl, "FORBIDDEN");
_;
}
function upgradeImpl(address _newImpl) public requireImpl {
require(_newImpl != address(0), "INVALID_ADDRESS");
require(_newImpl != impl, "NO_CHANGE");
address lastImpl = impl;
impl = _newImpl;
emit ImplChanged(lastImpl, _newImpl);
}
}
contract UpgradableGovernance {
address public governor;
event GovernorChanged(
address indexed _oldGovernor,
address indexed _newGovernor
);
constructor() public {
governor = msg.sender;
}
modifier requireGovernor() {
require(msg.sender == governor, "FORBIDDEN");
_;
}
function upgradeGovernance(address _newGovernor) public requireGovernor {
require(_newGovernor != address(0), "INVALID_ADDRESS");
require(_newGovernor != governor, "NO_CHANGE");
address lastGovernor = governor;
governor = _newGovernor;
emit GovernorChanged(lastGovernor, _newGovernor);
}
}
// Dependency file: @openzeppelin/contracts/utils/Context.sol
// pragma solidity >=0.6.0 <0.8.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with 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;
}
}
// Dependency file: @openzeppelin/contracts/token/ERC20/IERC20.sol
// pragma solidity >=0.6.0 <0.8.0;
/**
* @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);
}
// Dependency file: @openzeppelin/contracts/token/ERC20/ERC20.sol
// pragma solidity >=0.6.0 <0.8.0;
// import "@openzeppelin/contracts/utils/Context.sol";
// import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
// import "@openzeppelin/contracts/math/SafeMath.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name_, string memory symbol_) public {
_name = name_;
_symbol = symbol_;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual 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 virtual returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal virtual {
_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 { }
}
// Dependency file: contracts/libraries/Convert.sol
// pragma solidity >=0.6.5 <0.8.0;
pragma experimental ABIEncoderV2;
// import '/Users/sg99022ml/Desktop/chfry-protocol-internal/node_modules/@openzeppelin/contracts/token/ERC20/ERC20.sol';
// import '/Users/sg99022ml/Desktop/chfry-protocol-internal/node_modules/@openzeppelin/contracts/math/SafeMath.sol';
contract Convert {
using SafeMath for uint256;
function convertTokenAmount(
address _fromToken,
address _toToken,
uint256 _fromAmount
) public view returns (uint256 toAmount) {
uint256 fromDecimals = uint256(ERC20(_fromToken).decimals());
uint256 toDecimals = uint256(ERC20(_toToken).decimals());
if (fromDecimals > toDecimals) {
toAmount = _fromAmount.div(10**(fromDecimals.sub(toDecimals)));
} else if (toDecimals > fromDecimals) {
toAmount = _fromAmount.mul(10**(toDecimals.sub(fromDecimals)));
} else {
toAmount = _fromAmount;
}
return toAmount;
}
}
// Dependency file: contracts/interfaces/IERC20Burnable.sol
// pragma solidity >=0.6.5 <0.8.0;
interface IERC20Burnable {
function burn(uint256 amount) external;
function burnFrom(address account, uint256 amount) external;
}
// Dependency file: contracts/interfaces/IDetailedERC20.sol
// pragma solidity >=0.6.5 <0.8.0;
interface IDetailedERC20 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
// Root file: contracts/Oven.sol
pragma solidity >=0.6.5 <0.8.0;
// pragma experimental ABIEncoderV2;
// import '/Users/sg99022ml/Desktop/chfry-protocol-internal/node_modules/@openzeppelin/contracts/math/SafeMath.sol';
// import '/Users/sg99022ml/Desktop/chfry-protocol-internal/node_modules/@openzeppelin/contracts/utils/Address.sol';
// import '/Users/sg99022ml/Desktop/chfry-protocol-internal/node_modules/@openzeppelin/contracts/utils/ReentrancyGuard.sol';
// import 'contracts/libraries/TransferHelper.sol';
// import 'contracts/libraries/Upgradable.sol';
// import 'contracts/libraries/Convert.sol';
// import 'contracts/interfaces/IERC20Burnable.sol';
// import 'contracts/interfaces/IDetailedERC20.sol';
contract Oven is ReentrancyGuard, UpgradableProduct, Convert {
using SafeMath for uint256;
using TransferHelper for address;
using Address for address;
address public constant ZERO_ADDRESS = address(0);
uint256 public EXCHANGE_PERIOD;
address public friesToken;
address public token;
mapping(address => uint256) public depositedFriesTokens;
mapping(address => uint256) public tokensInBucket;
mapping(address => uint256) public realisedTokens;
mapping(address => uint256) public lastDividendPoints;
mapping(address => bool) public userIsKnown;
mapping(uint256 => address) public userList;
uint256 public nextUser;
uint256 public totalSupplyFriesTokens;
uint256 public buffer;
uint256 public lastDepositBlock;
uint256 public pointMultiplier = 10**18;
// SHARE
uint256 public totalDividendPoints;
// DAI/USDT/USDC Income
uint256 public unclaimedDividends;
address public upgradeAddress;
uint256 public upgradeTime;
uint256 public upgradeAmount;
mapping(address => bool) public whiteList;
event UpgradeSettingUpdate(address upgradeAddress, uint256 upgradeTime, uint256 upgradeAmount);
event Upgrade(address upgradeAddress, uint256 upgradeAmount);
event ExchangerPeriodUpdated(uint256 newTransmutationPeriod);
constructor(address _friesToken, address _token) public {
friesToken = _friesToken;
token = _token;
EXCHANGE_PERIOD = 50;
}
///@return displays the user's share of the pooled friesTokens.
function dividendsOwing(address account) public view returns (uint256) {
uint256 newDividendPoints = totalDividendPoints.sub(lastDividendPoints[account]);
return depositedFriesTokens[account].mul(newDividendPoints).div(pointMultiplier);
}
///@dev modifier to fill the bucket and keep bookkeeping correct incase of increase/decrease in shares
modifier updateAccount(address account) {
uint256 owing = dividendsOwing(account);
if (owing > 0) {
unclaimedDividends = unclaimedDividends.sub(owing);
tokensInBucket[account] = tokensInBucket[account].add(owing);
}
lastDividendPoints[account] = totalDividendPoints;
_;
}
///@dev modifier add users to userlist. Users are indexed in order to keep track of when a bond has been filled
modifier checkIfNewUser() {
if (!userIsKnown[msg.sender]) {
userList[nextUser] = msg.sender;
userIsKnown[msg.sender] = true;
nextUser++;
}
_;
}
///@dev run the phased distribution of the buffered funds
modifier runPhasedDistribution() {
uint256 _lastDepositBlock = lastDepositBlock;
uint256 _currentBlock = block.number;
uint256 _toDistribute = 0;
uint256 _buffer = buffer;
// check if there is something in bufffer
if (_buffer > 0) {
// NOTE: if last deposit was updated in the same block as the current call
// then the below logic gates will fail
//calculate diffrence in time
uint256 deltaTime = _currentBlock.sub(_lastDepositBlock);
// distribute all if bigger than timeframe
if (deltaTime >= EXCHANGE_PERIOD) {
_toDistribute = _buffer;
} else {
//needs to be bigger than 0 cuzz solidity no decimals
if (_buffer.mul(deltaTime) > EXCHANGE_PERIOD) {
_toDistribute = _buffer.mul(deltaTime).div(EXCHANGE_PERIOD);
}
}
// factually allocate if any needs distribution
if (_toDistribute > 0) {
// remove from buffer
buffer = _buffer.sub(_toDistribute);
// increase the allocation
increaseAllocations(_toDistribute);
}
}
// current timeframe is now the last
lastDepositBlock = _currentBlock;
_;
}
/// @dev A modifier which checks if whitelisted for minting.
modifier onlyWhitelisted() {
require(whiteList[msg.sender], '!whitelisted');
_;
}
///@dev set the EXCHANGE_PERIOD variable
///
/// sets the length (in blocks) of one full distribution phase
function setExchangePeriod(uint256 newExchangePeriod) public requireImpl {
EXCHANGE_PERIOD = newExchangePeriod;
emit ExchangerPeriodUpdated(EXCHANGE_PERIOD);
}
///@dev claims the base token after it has been exchange
///
///This function reverts if there is no realisedToken balance
function claim() public nonReentrant {
address sender = msg.sender;
require(realisedTokens[sender] > 0);
uint256 value = realisedTokens[sender];
realisedTokens[sender] = 0;
token.safeTransfer(sender, value);
}
///@dev Withdraws staked friesTokens from the exchange
///
/// This function reverts if you try to draw more tokens than you deposited
///
///@param amount the amount of friesTokens to unstake
function unstake(uint256 amount) public nonReentrant runPhasedDistribution() updateAccount(msg.sender) {
// by calling this function before transmuting you forfeit your gained allocation
address sender = msg.sender;
uint256 tokenAmount = convertTokenAmount(friesToken, token, amount);
amount = convertTokenAmount(token, friesToken, tokenAmount);
require(tokenAmount > 0, 'The amount is too small');
require(depositedFriesTokens[sender] >= amount, 'unstake amount exceeds deposited amount');
depositedFriesTokens[sender] = depositedFriesTokens[sender].sub(amount);
totalSupplyFriesTokens = totalSupplyFriesTokens.sub(amount);
friesToken.safeTransfer(sender, amount);
}
///@dev Deposits friesTokens into the exchange
///
///@param amount the amount of friesTokens to stake
function stake(uint256 amount)
public
nonReentrant
runPhasedDistribution()
updateAccount(msg.sender)
checkIfNewUser()
{
// precision
uint256 tokenAmount = convertTokenAmount(friesToken, token, amount);
amount = convertTokenAmount(token, friesToken, tokenAmount);
require(tokenAmount > 0, 'The amount is too small');
// requires approval of AlToken first
address sender = msg.sender;
//require tokens transferred in;
friesToken.safeTransferFrom(sender, address(this), amount);
totalSupplyFriesTokens = totalSupplyFriesTokens.add(amount);
depositedFriesTokens[sender] = depositedFriesTokens[sender].add(amount);
}
function exchange() public nonReentrant runPhasedDistribution() updateAccount(msg.sender) {
address sender = msg.sender;
uint256 pendingz = tokensInBucket[sender]; //
uint256 pendingzToFries = convertTokenAmount(token, friesToken, pendingz); // fries
uint256 diff; // token
require(pendingz > 0 && pendingzToFries > 0, 'need to have pending in bucket');
tokensInBucket[sender] = 0;
// check bucket overflow
if (pendingzToFries > depositedFriesTokens[sender]) {
diff = convertTokenAmount(friesToken, token, pendingzToFries.sub(depositedFriesTokens[sender]));
// remove overflow
pendingzToFries = depositedFriesTokens[sender];
pendingz = convertTokenAmount(friesToken, token, pendingzToFries);
require(pendingz > 0 && pendingzToFries > 0, 'need to have pending in bucket');
}
// decrease friesTokens
depositedFriesTokens[sender] = depositedFriesTokens[sender].sub(pendingzToFries);
// BURN friesTokens
IERC20Burnable(friesToken).burn(pendingzToFries);
// adjust total
totalSupplyFriesTokens = totalSupplyFriesTokens.sub(pendingzToFries);
// reallocate overflow
increaseAllocations(diff);
// add payout
realisedTokens[sender] = realisedTokens[sender].add(pendingz);
}
function forceExchange(address toExchange)
public
nonReentrant
runPhasedDistribution()
updateAccount(msg.sender)
updateAccount(toExchange)
{
//load into memory
address sender = msg.sender;
uint256 pendingz = tokensInBucket[toExchange];
uint256 pendingzToFries = convertTokenAmount(token, friesToken, pendingz);
// check restrictions
require(pendingzToFries > depositedFriesTokens[toExchange], '!overflow');
// empty bucket
tokensInBucket[toExchange] = 0;
address _toExchange = toExchange;
// calculaate diffrence
uint256 diff = convertTokenAmount(friesToken, token, pendingzToFries.sub(depositedFriesTokens[_toExchange]));
// remove overflow
pendingzToFries = depositedFriesTokens[_toExchange];
// decrease friesTokens
depositedFriesTokens[_toExchange] = 0;
// BURN friesTokens
IERC20Burnable(friesToken).burn(pendingzToFries);
// adjust total
totalSupplyFriesTokens = totalSupplyFriesTokens.sub(pendingzToFries);
// reallocate overflow
tokensInBucket[sender] = tokensInBucket[sender].add(diff);
uint256 payout = convertTokenAmount(friesToken, token, pendingzToFries);
// add payout
realisedTokens[_toExchange] = realisedTokens[_toExchange].add(payout);
// force payout of realised tokens of the toExchange address
if (realisedTokens[_toExchange] > 0) {
uint256 value = realisedTokens[_toExchange];
realisedTokens[_toExchange] = 0;
token.safeTransfer(_toExchange, value);
}
}
function exit() public {
exchange();
uint256 toWithdraw = depositedFriesTokens[msg.sender];
unstake(toWithdraw);
}
function exchangeAndClaim() public {
exchange();
claim();
}
function exchangeClaimAndWithdraw() public {
exchange();
claim();
uint256 toWithdraw = depositedFriesTokens[msg.sender];
unstake(toWithdraw);
}
/// @dev Distributes the base token proportionally to all alToken stakers.
///
/// This function is meant to be called by the Fries contract for when it is sending yield to the exchange.
/// Anyone can call this and add funds, idk why they would do that though...
///
/// @param origin the account that is sending the tokens to be distributed.
/// @param amount the amount of base tokens to be distributed to the exchange.
function distribute(address origin, uint256 amount) public onlyWhitelisted runPhasedDistribution {
token.safeTransferFrom(origin, address(this), amount);
buffer = buffer.add(amount);
}
/// @dev Allocates the incoming yield proportionally to all alToken stakers.
///
/// @param amount the amount of base tokens to be distributed in the exchange.
function increaseAllocations(uint256 amount) internal {
if (totalSupplyFriesTokens > 0 && amount > 0) {
totalDividendPoints = totalDividendPoints.add(amount.mul(pointMultiplier).div(totalSupplyFriesTokens));
unclaimedDividends = unclaimedDividends.add(amount);
} else {
buffer = buffer.add(amount);
}
}
/// @dev Gets the status of a user's staking position.
///
/// The total amount allocated to a user is the sum of pendingdivs and inbucket.
///
/// @param user the address of the user you wish to query.
///
/// returns user status
function userInfo(address user)
public
view
returns (
uint256 depositedToken,
uint256 pendingdivs,
uint256 inbucket,
uint256 realised
)
{
uint256 _depositedToken = depositedFriesTokens[user];
uint256 _toDistribute = buffer.mul(block.number.sub(lastDepositBlock)).div(EXCHANGE_PERIOD);
if (block.number.sub(lastDepositBlock) > EXCHANGE_PERIOD) {
_toDistribute = buffer;
}
uint256 _pendingdivs = 0;
if (totalSupplyFriesTokens > 0) {
_pendingdivs = _toDistribute.mul(depositedFriesTokens[user]).div(totalSupplyFriesTokens);
}
uint256 _inbucket = tokensInBucket[user].add(dividendsOwing(user));
uint256 _realised = realisedTokens[user];
return (_depositedToken, _pendingdivs, _inbucket, _realised);
}
/// @dev Gets the status of multiple users in one call
///
/// This function is used to query the contract to check for
/// accounts that have overfilled positions in order to check
/// who can be force exchange.
///
/// @param from the first index of the userList
/// @param to the last index of the userList
///
/// returns the userList with their staking status in paginated form.
function getMultipleUserInfo(uint256 from, uint256 to)
public
view
returns (address[] memory theUserList, uint256[] memory theUserData)
{
uint256 i = from;
uint256 delta = to - from;
address[] memory _theUserList = new address[](delta); //user
uint256[] memory _theUserData = new uint256[](delta * 2); //deposited-bucket
uint256 y = 0;
uint256 _toDistribute = buffer.mul(block.number.sub(lastDepositBlock)).div(EXCHANGE_PERIOD);
if (block.number.sub(lastDepositBlock) > EXCHANGE_PERIOD) {
_toDistribute = buffer;
}
for (uint256 x = 0; x < delta; x += 1) {
_theUserList[x] = userList[i];
_theUserData[y] = depositedFriesTokens[userList[i]];
uint256 pending = 0;
if (totalSupplyFriesTokens > 0) {
pending = _toDistribute.mul(depositedFriesTokens[userList[i]]).div(totalSupplyFriesTokens);
}
_theUserData[y + 1] = dividendsOwing(userList[i]).add(tokensInBucket[userList[i]]).add(pending);
y += 2;
i += 1;
}
return (_theUserList, _theUserData);
}
/// @dev Gets info on the buffer
///
/// This function is used to query the contract to get the
/// latest state of the buffer
///
/// @return _toDistribute the amount ready to be distributed
/// @return _deltaBlocks the amount of time since the last phased distribution
/// @return _buffer the amount in the buffer
function bufferInfo()
public
view
returns (
uint256 _toDistribute,
uint256 _deltaBlocks,
uint256 _buffer
)
{
_deltaBlocks = block.number.sub(lastDepositBlock);
_buffer = buffer;
_toDistribute = _buffer.mul(_deltaBlocks).div(EXCHANGE_PERIOD);
}
/// This function reverts if the caller is not governance
///
/// @param _toWhitelist the account to mint tokens to.
/// @param _state the whitelist state.
function setWhitelist(address _toWhitelist, bool _state) external requireImpl {
whiteList[_toWhitelist] = _state;
}
/// @notice Ensure that oven is invalid first!! then upgradesetting could be called.
function upgradeSetting(
address _upgradeAddress,
uint256 _upgradeTime,
uint256 _upgradeAmount
) external requireImpl {
require(_upgradeAddress != address(0) && _upgradeAddress != address(this), '!upgradeAddress');
require(_upgradeTime > block.timestamp, '!upgradeTime');
require(_upgradeAmount > 0, '!upgradeAmount');
upgradeAddress = _upgradeAddress;
upgradeTime = _upgradeTime;
upgradeAmount = _upgradeAmount;
emit UpgradeSettingUpdate(upgradeAddress, upgradeTime, upgradeAmount);
}
/// @notice Operation notice!
/// @notice The assets((DAI/USDT/USDC)) total value should be equal or more than user's fryUSD.
/// @notice Require upgradeAmount <= DAI/USDT/USDC - fryUSD
function upgrade() external requireImpl {
require(
upgradeAddress != address(0) && upgradeAmount > 0 && block.timestamp > upgradeTime && upgradeTime > 0,
'!upgrade'
);
token.safeApprove(upgradeAddress, upgradeAmount);
Oven(upgradeAddress).distribute(address(this), upgradeAmount);
upgradeAddress = address(0);
upgradeAmount = 0;
upgradeTime = 0;
emit Upgrade(upgradeAddress, upgradeAmount);
}
}
{
"compilationTarget": {
"tests/Oven.sol": "Oven"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
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