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YFI_YFV

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/**
/**
*Submitted for verification at Etherscan.io on 2020-07-17
*Submitted for verification at Etherscan.io on 2020-08-16
*/
*/


pragma solidity ^0.5.16;
pragma solidity ^0.5.16;


interface IERC20 {
interface IERC20 {
function totalSupply() external view returns (uint);
function totalSupply() external view returns (uint);
function balanceOf(address account) external view returns (uint);
function balanceOf(address account) external view returns (uint);
function transfer(address recipient, uint amount) external returns (bool);
function transfer(address recipient, uint amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint amount) external returns (bool);
function approve(address spender, uint amount) external returns (bool);
function transferFrom(address sender, address recipient, uint amount) external returns (bool);
function transferFrom(address sender, address recipient, uint amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint value);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}
}


contract Context {
contract Context {
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;
}
}
}
}


contract ERC20 is Context, IERC20 {
contract ERC20 is Context, IERC20 {
using SafeMath for uint;
using SafeMath for uint;


mapping (address => uint) private _balances;
mapping (address => uint) private _balances;


mapping (address => mapping (address => uint)) private _allowances;
mapping (address => mapping (address => uint)) private _allowances;


uint private _totalSupply;
uint private _totalSupply;
function totalSupply() public view returns (uint) {
function totalSupply() public view returns (uint) {
return _totalSupply;
return _totalSupply;
}
}
function balanceOf(address account) public view returns (uint) {
function balanceOf(address account) public view returns (uint) {
return _balances[account];
return _balances[account];
}
}
function transfer(address recipient, uint amount) public returns (bool) {
function transfer(address recipient, uint amount) public returns (bool) {
_transfer(_msgSender(), recipient, amount);
_transfer(_msgSender(), recipient, amount);
return true;
return true;
}
}
function allowance(address owner, address spender) public view returns (uint) {
function allowance(address owner, address spender) public view returns (uint) {
return _allowances[owner][spender];
return _allowances[owner][spender];
}
}
function approve(address spender, uint amount) public returns (bool) {
function approve(address spender, uint amount) public returns (bool) {
_approve(_msgSender(), spender, amount);
_approve(_msgSender(), spender, amount);
return true;
return true;
}
}
function transferFrom(address sender, address recipient, uint amount) public returns (bool) {
function transferFrom(address sender, address recipient, uint amount) public returns (bool) {
_transfer(sender, recipient, amount);
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
return true;
}
}
function increaseAllowance(address spender, uint addedValue) public returns (bool) {
function increaseAllowance(address spender, uint addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
return true;
}
}
function decreaseAllowance(address spender, uint subtractedValue) public returns (bool) {
function decreaseAllowance(address spender, uint subtractedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
return true;
}
}
function _transfer(address sender, address recipient, uint amount) internal {
function _transfer(address sender, address recipient, uint amount) internal {
require(sender != address(0), "ERC20: transfer from the zero address");
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");


_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
emit Transfer(sender, recipient, amount);
}
}
function _mint(address account, uint amount) internal {
function _mint(address account, uint amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
require(account != address(0), "ERC20: mint to the zero address");


_totalSupply = _totalSupply.add(amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
emit Transfer(address(0), account, amount);
}
}
function _burn(address account, uint amount) internal {
function _burn(address account, uint amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
require(account != address(0), "ERC20: burn from the zero address");


_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
emit Transfer(account, address(0), amount);
}
}
function _approve(address owner, address spender, uint amount) internal {
function _approve(address owner, address spender, uint amount) internal {
require(owner != address(0), "ERC20: approve from the zero address");
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
require(spender != address(0), "ERC20: approve to the zero address");


_allowances[owner][spender] = amount;
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
emit Approval(owner, spender, amount);
}
}
}
}


contract ERC20Detailed is IERC20 {
contract ERC20Detailed is IERC20 {
string private _name;
string private _name;
string private _symbol;
string private _symbol;
uint8 private _decimals;
uint8 private _decimals;


constructor (string memory name, string memory symbol, uint8 decimals) public {
constructor (string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_name = name;
_symbol = symbol;
_symbol = symbol;
_decimals = decimals;
_decimals = decimals;
}
}
function name() public view returns (string memory) {
function name() public view returns (string memory) {
return _name;
return _name;
}
}
function symbol() public view returns (string memory) {
function symbol() public view returns (string memory) {
return _symbol;
return _symbol;
}
}
function decimals() public view returns (uint8) {
function decimals() public view returns (uint8) {
return _decimals;
return _decimals;
}
}
}
}


library SafeMath {
library SafeMath {
function add(uint a, uint b) internal pure returns (uint) {
function add(uint a, uint b) internal pure returns (uint) {
uint c = a + b;
uint c = a + b;
require(c >= a, "SafeMath: addition overflow");
require(c >= a, "SafeMath: addition overflow");


return c;
return c;
}
}
function sub(uint a, uint b) internal pure returns (uint) {
function sub(uint a, uint b) internal pure returns (uint) {
return sub(a, b, "SafeMath: subtraction overflow");
return sub(a, b, "SafeMath: subtraction overflow");
}
}
function sub(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
function sub(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
require(b <= a, errorMessage);
require(b <= a, errorMessage);
uint c = a - b;
uint c = a - b;


return c;
return c;
}
}
function mul(uint a, uint b) internal pure returns (uint) {
function mul(uint a, uint b) internal pure returns (uint) {
if (a == 0) {
if (a == 0) {
return 0;
return 0;
}
}


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


return c;
return c;
}
}
function div(uint a, uint b) internal pure returns (uint) {
function div(uint a, uint b) internal pure returns (uint) {
return div(a, b, "SafeMath: division by zero");
return div(a, b, "SafeMath: division by zero");
}
}
function div(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
function div(uint a, uint b, string memory errorMessage) internal pure returns (uint) {
// Solidity only automatically asserts when dividing by 0
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
require(b > 0, errorMessage);
uint c = a / b;
uint c = a / b;


return c;
return c;
}
}
}
}


library Address {
library Address {
function isContract(address account) internal view returns (bool) {
function isContract(address account) internal view returns (bool) {
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);
}
}
}
}


library SafeERC20 {
library SafeERC20 {
using SafeMath for uint;
using SafeMath for uint;
using Address for address;
using Address for address;


function safeTransfer(IERC20 token, address to, uint value) internal {
function safeTransfer(IERC20 token, address to, uint 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, uint value) internal {
function safeTransferFrom(IERC20 token, address from, address to, uint 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, uint value) internal {
function safeApprove(IERC20 token, address spender, uint value) internal {
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 callOptionalReturn(IERC20 token, bytes memory data) private {
function callOptionalReturn(IERC20 token, bytes memory data) private {
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");
}
}
}
}
}
}


contract YFI is ERC20, ERC20Detailed {
contract YFV is ERC20, ERC20Detailed {
using SafeERC20 for IERC20;
using SafeERC20 for IERC20;
using Address for address;
using Address for address;
using SafeMath for uint;
using SafeMath for uint;
address public governance;
mapping (address => bool) public minters;


constructor () public ERC20Detailed("yearn.finance", "YFI", 18) {
address public governance;
governance = msg.sender;
mapping (address => bool) public minters;
}


function mint(address account, uint amount) public {
constructor () public ERC20Detailed("YFValue", "YFV", 18) {
require(minters[msg.sender], "!minter");
governance = msg.sender;
_mint(account, amount);
}
}

function mint(address account, uint256 amount) public {
function setGovernance(address _governance) public {
require(minters[msg.sender], "!minter");
require(msg.sender == governance, "!governance");
_mint(account, amount);
governance = _governance;
}
}

function burn(uint256 amount) public {
function addMinter(address _minter) public {
_burn(msg.sender, amount);
require(msg.sender == governance, "!governance");
}
minters[_minter] = true;

}
function setGovernance(address _governance) public {
require(msg.sender == governance, "!governance");
function removeMinter(address _minter) public {
governance = _governance;
require(msg.sender == governance, "!governance");
}
minters[_minter] = false;

}
function addMinter(address _minter) public {
}
require(msg.sender == governance, "!governance");
minters[_minter] = true;
}

function removeMinter(address _minter) public {
require(msg.sender == governance, "!governance");
minters[_minter] = false;
}
}
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