Contract Address Details

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
              

// Sources flattened with hardhat v2.6.2 https://hardhat.org

// File @openzeppelin/contracts/utils/[email protected]


pragma solidity ^0.8.0;

/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}

function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}


// File @openzeppelin/contracts/access/[email protected]


pragma solidity ^0.8.0;

/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;

event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(_msgSender());
}

/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual 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 {
_setOwner(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");
_setOwner(newOwner);
}

function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}


// File @openzeppelin/contracts/utils/math/[email protected]


pragma solidity ^0.8.0;

/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}

/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}

/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}

/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a / b + (a % b == 0 ? 0 : 1);
}
}


// File @openzeppelin/contracts/utils/math/[email protected]


pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
* now has built in overflow checking.
*/
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) {
unchecked {
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) {
unchecked {
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) {
unchecked {
// 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) {
unchecked {
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) {
unchecked {
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) {
return a + b;
}

/**
* @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 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) {
return a * b;
}

/**
* @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.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
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) {
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) {
unchecked {
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.
*
* 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) {
unchecked {
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) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}


// File @openzeppelin/contracts/security/[email protected]


pragma solidity ^0.8.0;

/**
* @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.
*/
abstract 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() {
_paused = false;
}

/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual 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());
}
}


// File @openzeppelin/contracts/security/[email protected]


pragma solidity ^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() {
_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;
}
}


// File @openzeppelin/contracts/token/ERC20/[email protected]


pragma solidity ^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);
}


// File @openzeppelin/contracts/utils/[email protected]


pragma solidity ^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;
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");

(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");

(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");

(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");

(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}

/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// 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

assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}


// File @openzeppelin/contracts/token/ERC20/utils/[email protected]


pragma solidity ^0.8.0;


/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;

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'
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) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}

function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_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
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}


// File contracts/interfaces/IElkERC20.sol


pragma solidity >=0.5.0;

interface IElkERC20 {
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;
}


// File contracts/StakingRewardsNew.sol


pragma solidity ^0.8.0;






contract StakingRewards is ReentrancyGuard, Ownable, Pausable {
using SafeMath for uint256;
using SafeERC20 for IERC20;

/* ========== STATE VARIABLES ========== */

IERC20 public rewardsToken;
IERC20 public stakingToken;
uint256 public periodFinish;
uint256 public rewardRate;
uint256 public rewardsDuration;
uint256 public lastUpdateTime;
uint256 public rewardPerTokenStored;

mapping(address => uint256) public userRewardPerTokenPaid;
mapping(address => uint256) public rewards;

IERC20 public boosterToken;
uint256 public boosterRewardRate;
uint256 public boosterRewardPerTokenStored;

mapping(address => uint256) public userBoosterRewardPerTokenPaid;
mapping(address => uint256) public boosterRewards;

mapping(address => uint256) public coverages;
uint256 public totalCoverage;

uint256[] public feeSchedule;
uint256[] public withdrawalFeesPct;
mapping(address => uint256) public lastStakedTime;
uint256 public totalFees;

uint256 private _totalSupply;
mapping(address => uint256) private _balances;

/* ========== CONSTRUCTOR ========== */

constructor(
address _rewardsToken,
address _stakingToken,
address _boosterToken,
uint256 _rewardsDuration,
uint256[] memory _feeSchedule, // assumes a sorted array
uint256[] memory _withdrawalFeesPct // aligned to fee schedule, percentage (/1000)
) public {
require(_boosterToken != _rewardsToken, "The booster token must be different from the reward token");
require(_boosterToken != _stakingToken, "The booster token must be different from the staking token");
rewardsToken = IERC20(_rewardsToken);
stakingToken = IERC20(_stakingToken);
boosterToken = IERC20(_boosterToken);
rewardsDuration = _rewardsDuration;
_setWithdrawalFees(_feeSchedule, _withdrawalFeesPct);
_pause();
}

/* ========== VIEWS ========== */

function totalSupply() external view returns (uint256) {
return _totalSupply;
}

function balanceOf(address account) external view returns (uint256) {
return _balances[account];
}

function lastTimeRewardApplicable() public view returns (uint256) {
return Math.min(block.timestamp, periodFinish);
}

function rewardPerToken() public view returns (uint256) {
if (_totalSupply == 0) {
return rewardPerTokenStored;
}
return
rewardPerTokenStored.add(
lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)
);
}

function earned(address account) public view returns (uint256) {
return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]);
}

function getRewardForDuration() external view returns (uint256) {
return rewardRate.mul(rewardsDuration);
}

function boosterRewardPerToken() public view returns (uint256) {
if (_totalSupply == 0) {
return boosterRewardPerTokenStored;
}
return
boosterRewardPerTokenStored.add(
lastTimeRewardApplicable().sub(lastUpdateTime).mul(boosterRewardRate).mul(1e18).div(_totalSupply)
);
}

function boosterEarned(address account) public view returns (uint256) {
return _balances[account].mul(boosterRewardPerToken().sub(userBoosterRewardPerTokenPaid[account])).div(1e18).add(boosterRewards[account]);
}

function getBoosterRewardForDuration() external view returns (uint256) {
return boosterRewardRate.mul(rewardsDuration);
}

function exitFee(address account) public view returns (uint256) {
return fee(account, _balances[account]);
}

function fee(address account, uint256 withdrawalAmount) public view returns (uint256) {
for (uint i=0; i < feeSchedule.length; ++i) {
if (block.timestamp.sub(lastStakedTime[account]) < feeSchedule[i]) {
return withdrawalAmount.mul(withdrawalFeesPct[i]).div(1000);
}
}
return 0;
}

/* ========== MUTATIVE FUNCTIONS ========== */

function stake(uint256 amount) external nonReentrant whenNotPaused updateReward(msg.sender) {
require(amount > 0, "Cannot stake 0");
_totalSupply = _totalSupply.add(amount);
_balances[msg.sender] = _balances[msg.sender].add(amount);
stakingToken.safeTransferFrom(msg.sender, address(this), amount);
lastStakedTime[msg.sender] = block.timestamp;
emit Staked(msg.sender, amount);
}

function stakeWithPermit(uint256 amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external nonReentrant updateReward(msg.sender) {
require(amount > 0, "Cannot stake 0");
_totalSupply = _totalSupply.add(amount);
_balances[msg.sender] = _balances[msg.sender].add(amount);

// permit
IElkERC20(address(stakingToken)).permit(msg.sender, address(this), amount, deadline, v, r, s);

stakingToken.safeTransferFrom(msg.sender, address(this), amount);
lastStakedTime[msg.sender] = block.timestamp;
emit Staked(msg.sender, amount);
}

function withdraw(uint256 amount) public nonReentrant updateReward(msg.sender) {
_withdraw(amount);
}

function emergencyWithdraw(uint256 amount) public nonReentrant {
_withdraw(amount);
}

function _withdraw(uint256 amount) private {
require(amount > 0, "Cannot withdraw 0");
_totalSupply = _totalSupply.sub(amount);
uint256 collectedFee = fee(msg.sender, amount);
_balances[msg.sender] = _balances[msg.sender].sub(amount);
uint256 withdrawableBalance = amount.sub(collectedFee);
stakingToken.safeTransfer(msg.sender, withdrawableBalance);
emit Withdrawn(msg.sender, withdrawableBalance);
if (collectedFee > 0) {
emit FeesCollected(msg.sender, collectedFee);
totalFees = totalFees.add(collectedFee);
}
}

function getReward() public nonReentrant updateReward(msg.sender) {
uint256 reward = rewards[msg.sender];
if (reward > 0) {
rewards[msg.sender] = 0;
rewardsToken.safeTransfer(msg.sender, reward);
emit RewardPaid(msg.sender, reward);
}
}

function getBoosterReward() public nonReentrant updateReward(msg.sender) {
if (address(boosterToken) != address(0)) {
uint256 reward = boosterRewards[msg.sender];
if (reward > 0) {
boosterRewards[msg.sender] = 0;
boosterToken.safeTransfer(msg.sender, reward);
emit BoosterRewardPaid(msg.sender, reward);
}
}
}

function getCoverage() public nonReentrant {
uint256 coverageAmount = coverages[msg.sender];
if (coverageAmount > 0) {
totalCoverage = totalCoverage.sub(coverages[msg.sender]);
coverages[msg.sender] = 0;
rewardsToken.safeTransfer(msg.sender, coverageAmount);
emit CoveragePaid(msg.sender, coverageAmount);
}
}

function exit() external {
withdraw(_balances[msg.sender]);
getReward();
getBoosterReward();
getCoverage();
}

/* ========== RESTRICTED FUNCTIONS ========== */

function sendRewardsAndStartEmission(uint256 reward, uint256 boosterReward, uint256 duration) external onlyOwner /*whenPaused*/ {
rewardsToken.safeTransferFrom(owner(), address(this), reward);
if (address(boosterToken) != address(0) && boosterReward > 0) {
boosterToken.safeTransferFrom(owner(), address(this), boosterReward);
}
_startEmission(reward, boosterReward, duration);
}

function startEmission(uint256 reward, uint256 boosterReward, uint256 duration) external onlyOwner /*whenPaused*/ {
_startEmission(reward, boosterReward, duration);
}

function stopEmission() external onlyOwner whenNotPaused {
require(block.timestamp < periodFinish, "Cannot stop rewards emissions if not started or already finished");

uint256 tokensToBurn;
uint256 boosterTokensToBurn;

if (_totalSupply == 0) {
tokensToBurn = rewardsToken.balanceOf(address(this));
if (address(boosterToken) != address(0)) {
boosterTokensToBurn = boosterToken.balanceOf(address(this));
} else {
boosterTokensToBurn = 0;
}
} else {
uint256 remaining = periodFinish.sub(block.timestamp);
tokensToBurn = rewardRate.mul(remaining);
boosterTokensToBurn = boosterRewardRate.mul(remaining);
}

periodFinish = block.timestamp;
if (tokensToBurn > 0) {
rewardsToken.safeTransfer(owner(), tokensToBurn);
}
if (address(boosterToken) != address(0) && boosterTokensToBurn > 0) {
boosterToken.safeTransfer(owner(), boosterTokensToBurn);
}

_pause();

emit RewardsEmissionEnded(tokensToBurn);
}

function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {
require(tokenAddress != address(stakingToken), "Cannot withdraw the staking token");
IERC20(tokenAddress).safeTransfer(owner(), tokenAmount);
emit Recovered(tokenAddress, tokenAmount);
}

function recoverLeftoverReward() external onlyOwner {
require(_totalSupply == 0 && rewardsToken == stakingToken, "Cannot recover leftover reward if it is not the staking token or there are still staked tokens");
uint256 tokensToBurn = rewardsToken.balanceOf(address(this));
if (tokensToBurn > 0) {
rewardsToken.safeTransfer(owner(), tokensToBurn);
}
emit LeftoverRewardRecovered(tokensToBurn);
}

function recoverLeftoverBooster() external onlyOwner {
require(address(boosterToken) != address(0), "Cannot recover leftover booster if there was no booster token set");
require(_totalSupply == 0, "Cannot recover leftover booster if there are still staked tokens");
uint256 tokensToBurn = boosterToken.balanceOf(address(this));
if (tokensToBurn > 0) {
boosterToken.safeTransfer(owner(), tokensToBurn);
}
emit LeftoverBoosterRecovered(tokensToBurn);
}

function recoverFees() external onlyOwner {
stakingToken.safeTransfer(owner(), totalFees);
emit FeesRecovered(totalFees);
totalFees = 0;
}

function setReward(address addr, uint256 amount) public onlyOwner {
rewards[addr] = amount;
}

function setRewards(address[] memory addresses, uint256[] memory amounts) external onlyOwner {
require(addresses.length == amounts.length, "The same number of addresses and amounts must be provided");
for (uint i=0; i < addresses.length; ++i) {
setReward(addresses[i], amounts[i]);
}
}

function setRewardsDuration(uint256 duration) external onlyOwner {
require(
block.timestamp > periodFinish,
"Previous rewards period must be complete before changing the duration for the new period"
);
_setRewardsDuration(duration);
}

// Booster Rewards

function setBoosterToken(address _boosterToken) external onlyOwner {
require(_boosterToken != address(rewardsToken), "The booster token must be different from the reward token");
require(_boosterToken != address(stakingToken), "The booster token must be different from the staking token");
boosterToken = IERC20(_boosterToken);
emit BoosterRewardSet(_boosterToken);
}

function setBoosterReward(address addr, uint256 amount) public onlyOwner {
boosterRewards[addr] = amount;
}

function setBoosterRewards(address[] memory addresses, uint256[] memory amounts) external onlyOwner {
require(addresses.length == amounts.length, "The same number of addresses and amounts must be provided");
for (uint i=0; i < addresses.length; ++i) {
setBoosterReward(addresses[i], amounts[i]);
}
}

// ILP

function setCoverageAmount(address addr, uint256 amount) public onlyOwner {
totalCoverage = totalCoverage.sub(coverages[addr]);
coverages[addr] = amount;
totalCoverage = totalCoverage.add(coverages[addr]);
}

function setCoverageAmounts(address[] memory addresses, uint256[] memory amounts) external onlyOwner {
require(addresses.length == amounts.length, "The same number of addresses and amounts must be provided");
for (uint i=0; i < addresses.length; ++i) {
setCoverageAmount(addresses[i], amounts[i]);
}
}

function pause() public virtual {
_pause();
}

function unpause() public virtual {
_unpause();
}

// Withdrawal Fees

function setWithdrawalFees(uint256[] memory _feeSchedule, uint256[] memory _withdrawalFees) external onlyOwner {
_setWithdrawalFees(_feeSchedule, _withdrawalFees);
}

// Private functions

function _setRewardsDuration(uint256 duration) private {
rewardsDuration = duration;
emit RewardsDurationUpdated(rewardsDuration);
}

function _setWithdrawalFees(uint256[] memory _feeSchedule, uint256[] memory _withdrawalFeesPct) private {
require(_feeSchedule.length == _withdrawalFeesPct.length, "Fee schedule and withdrawal fees arrays must be the same length!");
feeSchedule = _feeSchedule;
withdrawalFeesPct = _withdrawalFeesPct;
emit WithdrawalFeesSet(_feeSchedule, _withdrawalFeesPct);
}

// Must send reward before calling this!
function _startEmission(uint256 reward, uint256 boosterReward, uint256 duration) private updateReward(address(0)) {
if (duration > 0) {
_setRewardsDuration(duration);
}

if (block.timestamp >= periodFinish) {
rewardRate = reward.div(rewardsDuration);
boosterRewardRate = boosterReward.div(rewardsDuration);
} else {
uint256 remaining = periodFinish.sub(block.timestamp);
uint256 leftover = remaining.mul(rewardRate);
rewardRate = reward.add(leftover).div(rewardsDuration);
uint256 boosterLeftover = remaining.mul(boosterRewardRate);
boosterRewardRate = boosterReward.add(boosterLeftover).div(rewardsDuration);
}

// Ensure the provided reward amount is not more than the balance in the contract.
// This keeps the reward rate in the right range, preventing overflows due to
// very high values of rewardRate in the earned and rewardsPerToken functions;
// Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
uint balance = rewardsToken.balanceOf(address(this));
require(rewardRate <= balance.div(rewardsDuration) || (rewardsToken == stakingToken && rewardRate <= balance.div(rewardsDuration).sub(_totalSupply)), "Provided reward too high");

if (address(boosterToken) != address(0)) {
uint boosterBalance = boosterToken.balanceOf(address(this));
require(boosterRewardRate <= boosterBalance.div(rewardsDuration), "Provided booster reward too high");
}

lastUpdateTime = block.timestamp;
periodFinish = block.timestamp.add(rewardsDuration);

_unpause();

emit RewardsEmissionStarted(reward, boosterReward, duration);
}

/* ========== DEPRECATED ========== */

function coverageOf(address account) external view returns (uint256) {
return coverages[account];
}

function updateLastTime(uint timestamp) external onlyOwner {
     lastUpdateTime = timestamp;
}

/* ========== MODIFIERS ========== */

modifier updateReward(address account) {
rewardPerTokenStored = rewardPerToken();
boosterRewardPerTokenStored = boosterRewardPerToken();
lastUpdateTime = lastTimeRewardApplicable();
if (account != address(0)) {
rewards[account] = earned(account);
userRewardPerTokenPaid[account] = rewardPerTokenStored;
boosterRewards[account] = boosterEarned(account);
userBoosterRewardPerTokenPaid[account] = boosterRewardPerTokenStored;
}
_;
}

/* ========== EVENTS ========== */

event Staked(address indexed user, uint256 amount);
event Withdrawn(address indexed user, uint256 amount);
event CoveragePaid(address indexed user, uint256 amount);
event RewardPaid(address indexed user, uint256 reward);
event BoosterRewardPaid(address indexed user, uint256 reward);
event RewardsDurationUpdated(uint256 newDuration);
event Recovered(address token, uint256 amount);
event LeftoverRewardRecovered(uint256 amount);
event LeftoverBoosterRecovered(uint256 amount);
event RewardsEmissionStarted(uint256 reward, uint256 boosterReward, uint256 duration);
event RewardsEmissionEnded(uint256 amount);
event BoosterRewardSet(address token);
event WithdrawalFeesSet(uint256[] _feeSchedule, uint256[] _withdrawalFees);
event FeesCollected(address indexed user, uint256 amount);
event FeesRecovered(uint256 amount);
}

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