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YFIRewards_vs_YFV_Rewards_PoolXXX

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/**
*Submitted for verification at Etherscan.io on 2020-07-17
*/

/*
/*
____ __ __ __ _
____ __ __ __ _
/ __/__ __ ___ / /_ / / ___ / /_ (_)__ __
/ __/__ __ ___ / /_ / / ___ / /_ (_)__ __
_\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
_\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
/___/
/___/


* Synthetix: YFIRewards.sol
* Synthetix: YFIRewards.sol
*
*
* Docs: https://docs.synthetix.io/
* Docs: https://docs.synthetix.io/
*
*
*
*
* MIT License
* MIT License
* ===========
* ===========
*
*
* Copyright (c) 2020 Synthetix
* Copyright (c) 2020 Synthetix
*
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* furnished to do so, subject to the following conditions:
*
*
* The above copyright notice and this permission notice shall be included in all
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* copies or substantial portions of the Software.
*
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/
*/


// File: @openzeppelin/contracts/math/Math.sol
// File: @openzeppelin/contracts/math/Math.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;


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


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


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


// File: @openzeppelin/contracts/math/SafeMath.sol
// File: @openzeppelin/contracts/math/SafeMath.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;


/**
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
* checks.
*
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
* operation overflows.
*
*
* Using this library instead of the unchecked operations eliminates an entire
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
* class of bugs, so it's recommended to use it always.
*/
*/
library SafeMath {
library SafeMath {
/**
/**
* @dev Returns the addition of two unsigned integers, reverting on
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
* overflow.
*
*
* Counterpart to Solidity's `+` operator.
* Counterpart to Solidity's `+` operator.
*
*
* Requirements:
* Requirements:
* - Addition cannot overflow.
* - Addition cannot overflow.
*/
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
require(c >= a, "SafeMath: addition overflow");


return c;
return c;
}
}


/**
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
* overflow (when the result is negative).
*
*
* Counterpart to Solidity's `-` operator.
* Counterpart to Solidity's `-` operator.
*
*
* Requirements:
* Requirements:
* - Subtraction cannot overflow.
* - Subtraction cannot overflow.
*/
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
return sub(a, b, "SafeMath: subtraction overflow");
}
}


/**
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
* overflow (when the result is negative).
*
*
* Counterpart to Solidity's `-` operator.
* Counterpart to Solidity's `-` operator.
*
*
* Requirements:
* Requirements:
* - Subtraction cannot overflow.
* - Subtraction cannot overflow.
*
*
* _Available since v2.4.0._
* _Available since v2.4.0._
*/
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
require(b <= a, errorMessage);
uint256 c = a - b;
uint256 c = a - b;


return c;
return c;
}
}


/**
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
* overflow.
*
*
* Counterpart to Solidity's `*` operator.
* Counterpart to Solidity's `*` operator.
*
*
* Requirements:
* Requirements:
* - Multiplication cannot overflow.
* - Multiplication cannot overflow.
*/
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
if (a == 0) {
return 0;
return 0;
}
}


uint256 c = a * b;
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
require(c / a == b, "SafeMath: multiplication overflow");


return c;
return c;
}
}


/**
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
* division by zero. The result is rounded towards zero.
*
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
* uses an invalid opcode to revert (consuming all remaining gas).
*
*
* Requirements:
* Requirements:
* - The divisor cannot be zero.
* - The divisor cannot be zero.
*/
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
return div(a, b, "SafeMath: division by zero");
}
}


/**
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
* division by zero. The result is rounded towards zero.
*
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
* uses an invalid opcode to revert (consuming all remaining gas).
*
*
* Requirements:
* Requirements:
* - The divisor cannot be zero.
* - The divisor cannot be zero.
*
*
* _Available since v2.4.0._
* _Available since v2.4.0._
*/
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
require(b > 0, errorMessage);
uint256 c = a / b;
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
// assert(a == b * c + a % b); // There is no case in which this doesn't hold


return c;
return c;
}
}


/**
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
* Reverts when dividing by zero.
*
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
* invalid opcode to revert (consuming all remaining gas).
*
*
* Requirements:
* Requirements:
* - The divisor cannot be zero.
* - The divisor cannot be zero.
*/
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
return mod(a, b, "SafeMath: modulo by zero");
}
}


/**
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
* Reverts with custom message when dividing by zero.
*
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
* invalid opcode to revert (consuming all remaining gas).
*
*
* Requirements:
* Requirements:
* - The divisor cannot be zero.
* - The divisor cannot be zero.
*
*
* _Available since v2.4.0._
* _Available since v2.4.0._
*/
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
require(b != 0, errorMessage);
return a % b;
return a % b;
}
}
}
}


// File: @openzeppelin/contracts/GSN/Context.sol
// File: @openzeppelin/contracts/GSN/Context.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;


/*
/*
* @dev Provides information about the current execution context, including the
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* 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
* 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
* 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
* paying for execution may not be the actual sender (as far as an application
* is concerned).
* is concerned).
*
*
* This contract is only required for intermediate, library-like contracts.
* This contract is only required for intermediate, library-like contracts.
*/
*/
contract Context {
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
// an instance of this contract, which should be used via inheritance.
constructor () internal {}
constructor () internal {}
// solhint-disable-previous-line no-empty-blocks
// solhint-disable-previous-line no-empty-blocks


function _msgSender() internal view returns (address payable) {
function _msgSender() internal view returns (address payable) {
return msg.sender;
return msg.sender;
}
}


function _msgData() internal view returns (bytes memory) {
function _msgData() internal view returns (bytes memory) {
this;
this;
// silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
// silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
return msg.data;
}
}
}
}


// File: @openzeppelin/contracts/ownership/Ownable.sol
// File: @openzeppelin/contracts/ownership/Ownable.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;


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


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


/**
/**
* @dev Initializes the contract setting the deployer as the initial owner.
* @dev Initializes the contract setting the deployer as the initial owner.
*/
*/
constructor () internal {
constructor () internal {
_owner = _msgSender();
_owner = _msgSender();
emit OwnershipTransferred(address(0), _owner);
emit OwnershipTransferred(address(0), _owner);
}
}


/**
/**
* @dev Returns the address of the current owner.
* @dev Returns the address of the current owner.
*/
*/
function owner() public view returns (address) {
function owner() public view returns (address) {
return _owner;
return _owner;
}
}


/**
/**
* @dev Throws if called by any account other than the owner.
* @dev Throws if called by any account other than the owner.
*/
*/
modifier onlyOwner() {
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
require(isOwner(), "Ownable: caller is not the owner");
_;
_;
}
}


/**
/**
* @dev Returns true if the caller is the current owner.
* @dev Returns true if the caller is the current owner.
*/
*/
function isOwner() public view returns (bool) {
function isOwner() public view returns (bool) {
return _msgSender() == _owner;
return _msgSender() == _owner;
}
}


/**
/**
* @dev Leaves the contract without owner. It will not be possible to call
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
* thereby removing any functionality that is only available to the owner.
*/
*/
function renounceOwnership() public onlyOwner {
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
_owner = address(0);
}
}


/**
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
* Can only be called by the current owner.
*/
*/
function transferOwnership(address newOwner) public onlyOwner {
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
_transferOwnership(newOwner);
}
}


/**
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
*/
function _transferOwnership(address newOwner) internal {
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
_owner = newOwner;
}
}
}
}


// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;


/**
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
* the optional functions; to access them see {ERC20Detailed}.
*/
*/
interface IERC20 {
interface IERC20 {
/**
/**
* @dev Returns the amount of tokens in existence.
* @dev Returns the amount of tokens in existence.
*/
*/
function totalSupply() external view returns (uint256);
function totalSupply() external view returns (uint256);


/**
/**
* @dev Returns the amount of tokens owned by `account`.
* @dev Returns the amount of tokens owned by `account`.
*/
*/
function balanceOf(address account) external view returns (uint256);
function balanceOf(address account) external view returns (uint256);


/**
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
*
* Returns a boolean value indicating whether the operation succeeded.
* Returns a boolean value indicating whether the operation succeeded.
*
*
* Emits a {Transfer} event.
* Emits a {Transfer} event.
*/
*/
function transfer(address recipient, uint256 amount) external returns (bool);
function transfer(address recipient, uint256 amount) external returns (bool);


function mint(address account, uint amount) external;

function burn(uint amount) external;

/**
/**
* @dev Returns the remaining number of tokens that `spender` will be
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
* zero by default.
*
*
* This value changes when {approve} or {transferFrom} are called.
* This value changes when {approve} or {transferFrom} are called.
*/
*/
function allowance(address owner, address spender) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);


/**
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
*
* Returns a boolean value indicating whether the operation succeeded.
* Returns a boolean value indicating whether the operation succeeded.
*
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* 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
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
*
* Emits an {Approval} event.
* Emits an {Approval} event.
*/
*/
function approve(address spender, uint256 amount) external returns (bool);
function approve(address spender, uint256 amount) external returns (bool);


/**
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
* allowance.
*
*
* Returns a boolean value indicating whether the operation succeeded.
* Returns a boolean value indicating whether the operation succeeded.
*
*
* Emits a {Transfer} event.
* Emits a {Transfer} event.
*/
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);


/**
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
* another (`to`).
*
*
* Note that `value` may be zero.
* Note that `value` may be zero.
*/
*/
event Transfer(address indexed from, address indexed to, uint256 value);
event Transfer(address indexed from, address indexed to, uint256 value);


/**
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
* a call to {approve}. `value` is the new allowance.
*/
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
}


// File: @openzeppelin/contracts/utils/Address.sol
// File: @openzeppelin/contracts/utils/Address.sol


pragma solidity ^0.5.5;
pragma solidity ^0.5.5;


/**
/**
* @dev Collection of functions related to the address type
* @dev Collection of functions related to the address type
*/
*/
library Address {
library Address {
/**
/**
* @dev Returns true if `account` is a contract.
* @dev Returns true if `account` is a contract.
*
*
* This test is non-exhaustive, and there may be false-negatives: during the
* This test is non-exhaustive, and there may be false-negatives: during the
* execution of a contract's constructor, its address will be reported as
* execution of a contract's constructor, its address will be reported as
* not containing a contract.
* not containing a contract.
*
*
* IMPORTANT: It is unsafe to assume that an address for which this
* IMPORTANT: It is unsafe to assume that an address for which this
* function returns false is an externally-owned account (EOA) and not a
* function returns false is an externally-owned account (EOA) and not a
* contract.
* contract.
*/
*/
function isContract(address account) internal view returns (bool) {
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// construction, since the code is only stored at the end of the
// constructor execution.
// constructor execution.


// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
// solhint-disable-next-line no-inline-assembly
assembly {codehash := extcodehash(account)}
assembly {codehash := extcodehash(account)}
return (codehash != 0x0 && codehash != accountHash);
return (codehash != 0x0 && codehash != accountHash);
}
}


/**
/**
* @dev Converts an `address` into `address payable`. Note that this is
* @dev Converts an `address` into `address payable`. Note that this is
* simply a type cast: the actual underlying value is not changed.
* simply a type cast: the actual underlying value is not changed.
*
*
* _Available since v2.4.0._
* _Available since v2.4.0._
*/
*/
function toPayable(address account) internal pure returns (address payable) {
function toPayable(address account) internal pure returns (address payable) {
return address(uint160(account));
return address(uint160(account));
}
}


/**
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
* `recipient`, forwarding all available gas and reverting on errors.
*
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
* `transfer`. {sendValue} removes this limitation.
*
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*
*
* _Available since v2.4.0._
* _Available since v2.4.0._
*/
*/
function sendValue(address payable recipient, uint256 amount) internal {
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
require(address(this).balance >= amount, "Address: insufficient balance");


// solhint-disable-next-line avoid-call-value
// solhint-disable-next-line avoid-call-value
(bool success,) = recipient.call.value(amount)("");
(bool success,) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
require(success, "Address: unable to send value, recipient may have reverted");
}
}
}
}


// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol
// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;








/**
/**
* @title SafeERC20
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* 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
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* successful.
* To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
* To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
*/
library SafeERC20 {
library SafeERC20 {
using SafeMath for uint256;
using SafeMath for uint256;
using Address for address;
using Address for address;


function safeTransfer(IERC20 token, address to, uint256 value) internal {
function safeTransfer(IERC20 token, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
}


function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
}


function safeApprove(IERC20 token, address spender, uint256 value) internal {
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
"SafeERC20: approve from non-zero to non-zero allowance"
);
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
}


function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
uint256 newAllowance = token.allowance(address(this), spender).add(value);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}


function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
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
* @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).
* 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 token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
* @param data The call data (encoded using abi.encode or one of its variants).
*/
*/
function callOptionalReturn(IERC20 token, bytes memory data) private {
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 need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves.
// we're implementing it ourselves.


// A Solidity high level call has three parts:
// A Solidity high level call has three parts:
// 1. The target address is checked to verify it contains contract code
// 1. The target address is checked to verify it contains contract code
// 2. The call itself is made, and success asserted
// 2. The call itself is made, and success asserted
// 3. The return value is decoded, which in turn checks the size of the returned data.
// 3. The return value is decoded, which in turn checks the size of the returned data.
// solhint-disable-next-line max-line-length
// solhint-disable-next-line max-line-length
require(address(token).isContract(), "SafeERC20: call to non-contract");
require(address(token).isContract(), "SafeERC20: call to non-contract");


// solhint-disable-next-line avoid-low-level-calls
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "SafeERC20: low-level call failed");
require(success, "SafeERC20: low-level call failed");


if (returndata.length > 0) {// Return data is optional
if (returndata.length > 0) {// Return data is optional
// solhint-disable-next-line max-line-length
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
}
}
}


// File: contracts/IRewardDistributionRecipient.sol
// File: contracts/IRewardDistributionRecipient.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;




contract IRewardDistributionRecipient is Ownable {
contract IRewardDistributionRecipient is Ownable {
address rewardDistribution;
address public rewardReferral;
address public rewardVote;


function notifyRewardAmount(uint256 reward) external;
function notifyRewardAmount(uint256 reward) external;


modifier onlyRewardDistribution() {
function setRewardReferral(address _rewardReferral) external onlyOwner {
require(_msgSender() == rewardDistribution, "Caller is not reward distribution");
rewardReferral = _rewardReferral;
_;
}
}


function setRewardDistribution(address _rewardDistribution)
function setRewardVote(address _rewardVote) external onlyOwner {
external
rewardVote = _rewardVote;
onlyOwner
{
rewardDistribution = _rewardDistribution;
}
}
}
}


// File: contracts/CurveRewards.sol
// File: contracts/CurveRewards.sol


pragma solidity ^0.5.0;
pragma solidity ^0.5.0;




contract LPTokenWrapper {
contract LPTokenWrapper {
using SafeMath for uint256;
using SafeMath for uint256;
using SafeERC20 for IERC20;
using SafeERC20 for IERC20;
using Address for address;

IERC20 public y = IERC20(0xc19e3035A4F6F69B981C7dC2F533e862aA3Af496);


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


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


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


function stake(uint256 amount) public {
function tokenStake(uint256 amount) internal {
_totalSupply = _totalSupply.add(amount);
_totalSupply = _totalSupply.add(amount);
_balances[msg.sender] = _balances[msg.sender].add(amount);
_balances[msg.sender] = _balances[msg.sender].add(amount);
y.safeTransferFrom(msg.sender, address(this), amount);
y.safeTransferFrom(msg.sender, address(this), amount);
}
}


function withdraw(uint256 amount) public {
function tokenWithdraw(uint256 amount) internal {
_totalSupply = _totalSupply.sub(amount);
_totalSupply = _totalSupply.sub(amount);
_balances[msg.sender] = _balances[msg.sender].sub(amount);
_balances[msg.sender] = _balances[msg.sender].sub(amount);
y.safeTransfer(msg.sender, amount);
y.safeTransfer(msg.sender, amount);
}
}
}
}


contract YearnRewards is LPTokenWrapper, IRewardDistributionRecipient {
interface IYFVReferral {
IERC20 public yfi = IERC20(0x0bc529c00C6401aEF6D220BE8C6Ea1667F6Ad93e);
function setReferrer(address farmer, address referrer) external;
function getReferrer(address farmer) external view returns (address);
}

interface IYFVVote {
function averageVotingValue(address poolAddress, uint256 votingItem) external view returns (uint16);
}

interface IYFVStake {
function stakeOnBehalf(address stakeFor, uint256 amount) external;
}

contract YFVRewardsBALPool is LPTokenWrapper, IRewardDistributionRecipient {
IERC20 public yfv = IERC20(0x45f24BaEef268BB6d63AEe5129015d69702BCDfa);
IERC20 public vUSD = IERC20(0x1B8E12F839BD4e73A47adDF76cF7F0097d74c14C);
IERC20 public vETH = IERC20(0x76A034e76Aa835363056dd418611E4f81870f16e);

uint256 public vUSD_REWARD_FRACTION_RATE = 21000000000; // 21 * 1e9 (vUSD decimals = 9)
uint256 public vETH_REWARD_FRACTION_RATE = 21000000000000; // 21000 * 1e9 (vETH decimals = 9)

uint256 public constant DURATION = 7 days;
uint256 public constant DURATION = 7 days;
uint8 public constant NUMBER_EPOCHS = 10;

uint256 public constant REFERRAL_COMMISSION_PERCENT = 1;

uint256 public constant EPOCH_REWARD = 63000 ether;
uint256 public constant TOTAL_REWARD = EPOCH_REWARD * NUMBER_EPOCHS;


uint256 public currentEpochReward = EPOCH_REWARD;
uint256 public totalAccumulatedReward = 0;
uint8 public currentEpoch = 0;
uint256 public starttime = 1597932000; // Thursday, August 20, 2020 2:00:00 PM (GMT+0)
uint256 public periodFinish = 0;
uint256 public periodFinish = 0;
uint256 public rewardRate = 0;
uint256 public rewardRate = 0;
uint256 public lastUpdateTime;
uint256 public lastUpdateTime;
uint256 public rewardPerTokenStored;
uint256 public rewardPerTokenStored;
mapping(address => uint256) public userRewardPerTokenPaid;
mapping(address => uint256) public userRewardPerTokenPaid;
mapping(address => uint256) public rewards;
mapping(address => uint256) public rewards;
mapping(address => bool) public claimedVETHRewards; // account -> has claimed vETH?

mapping(address => uint256) public accumulatedStakingPower; // will accumulate every time staker does getReward()

address public rewardStake;


event RewardAdded(uint256 reward);
event RewardAdded(uint256 reward);
event Burned(uint256 reward);
event Staked(address indexed user, uint256 amount);
event Staked(address indexed user, uint256 amount);
event Withdrawn(address indexed user, uint256 amount);
event Withdrawn(address indexed user, uint256 amount);
event RewardPaid(address indexed user, uint256 reward);
event RewardPaid(address indexed user, uint256 reward);
event CommissionPaid(address indexed user, uint256 reward);


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


function lastTimeRewardApplicable() public view returns (uint256) {
function lastTimeRewardApplicable() public view returns (uint256) {
return Math.min(block.timestamp, periodFinish);
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
balanceOf(account)
.mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
.div(1e18)
.add(rewards[account]);
}

// stake visibility is public as overriding LPTokenWrapper's stake() function
function stake(uint256 amount) public updateReward(msg.sender) {
require(amount > 0, "Cannot stake 0");
super.stake(amount);
emit Staked(msg.sender, amount);
}

function withdraw(uint256 amount) public updateReward(msg.sender) {
require(amount > 0, "Cannot withdraw 0");
super.withdraw(amount);
emit Withdrawn(msg.sender, amount);
}

function exit() external {
withdraw(balanceOf(msg.sender));
getReward();
}

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

function notifyRewardAmount(uint256 reward)
external
onlyRewardDistribution
updateReward(address(0))
{
if (block.timestamp >= periodFinish) {
rewardRate = reward
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