Contract Source Code:
File 1 of 1 : VaultUSDC
// File: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.5.5;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Converts an `address` into `address payable`. Note that this is
* simply a type cast: the actual underlying value is not changed.
*
* _Available since v2.4.0._
*/
function toPayable(address account) internal pure returns (address payable) {
return address(uint160(account));
}
/**
* @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].
*
* _Available since v2.4.0._
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-call-value
(bool success, ) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
}
}
// File: @openzeppelin/contracts/math/Math.sol
pragma solidity ^0.5.0;
/**
* @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, so we distribute
return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
}
}
// File: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.5.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*
* _Available since v2.4.0._
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
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/token/ERC20/SafeERC20.sol
pragma solidity ^0.5.0;
/**
* @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 ERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves.
// A Solidity high level call has three parts:
// 1. The target address is checked to verify it contains contract code
// 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.
// solhint-disable-next-line max-line-length
require(address(token).isContract(), "SafeERC20: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File: @openzeppelin/contracts/GSN/Context.sol
pragma solidity ^0.5.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor () internal { }
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: @openzeppelin/contracts/token/ERC20/ERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20Mintable}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "ERC20: transfer from 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[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Destroys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See {_burn} and {_approve}.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
}
}
// File: @openzeppelin/contracts/token/ERC20/ERC20Detailed.sol
pragma solidity ^0.5.0;
/**
* @dev Optional functions from the ERC20 standard.
*/
contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
* these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
}
// File: contracts/hardworkInterface/IStrategy.sol
pragma solidity 0.5.16;
interface IStrategy {
function unsalvagableTokens(address tokens) external view returns (bool);
function governance() external view returns (address);
function controller() external view returns (address);
function underlying() external view returns (address);
function vault() external view returns (address);
function withdrawAllToVault() external;
function withdrawToVault(uint256 amount) external;
function investedUnderlyingBalance() external view returns (uint256); // itsNotMuch()
// should only be called by controller
function salvage(address recipient, address token, uint256 amount) external;
function doHardWork() external;
function depositArbCheck() external view returns(bool);
}
// File: contracts/hardworkInterface/IController.sol
pragma solidity 0.5.16;
interface IController {
// [Grey list]
// An EOA can safely interact with the system no matter what.
// If you're using Metamask, you're using an EOA.
// Only smart contracts may be affected by this grey list.
//
// This contract will not be able to ban any EOA from the system
// even if an EOA is being added to the greyList, he/she will still be able
// to interact with the whole system as if nothing happened.
// Only smart contracts will be affected by being added to the greyList.
// This grey list is only used in Vault.sol, see the code there for reference
function greyList(address _target) external returns(bool);
function addVaultAndStrategy(address _vault, address _strategy) external;
function doHardWork(address _vault) external;
function hasVault(address _vault) external returns(bool);
function salvage(address _token, uint256 amount) external;
function salvageStrategy(address _strategy, address _token, uint256 amount) external;
function notifyFee(address _underlying, uint256 fee) external;
function profitSharingNumerator() external view returns (uint256);
function profitSharingDenominator() external view returns (uint256);
}
// File: contracts/Storage.sol
pragma solidity 0.5.16;
contract Storage {
address public governance;
address public controller;
constructor() public {
governance = msg.sender;
}
modifier onlyGovernance() {
require(isGovernance(msg.sender), "Not governance");
_;
}
function setGovernance(address _governance) public onlyGovernance {
require(_governance != address(0), "new governance shouldn't be empty");
governance = _governance;
}
function setController(address _controller) public onlyGovernance {
require(_controller != address(0), "new controller shouldn't be empty");
controller = _controller;
}
function isGovernance(address account) public view returns (bool) {
return account == governance;
}
function isController(address account) public view returns (bool) {
return account == controller;
}
}
// File: contracts/Governable.sol
pragma solidity 0.5.16;
contract Governable {
Storage public store;
constructor(address _store) public {
require(_store != address(0), "new storage shouldn't be empty");
store = Storage(_store);
}
modifier onlyGovernance() {
require(store.isGovernance(msg.sender), "Not governance");
_;
}
function setStorage(address _store) public onlyGovernance {
require(_store != address(0), "new storage shouldn't be empty");
store = Storage(_store);
}
function governance() public view returns (address) {
return store.governance();
}
}
// File: contracts/hardworkInterface/IVault.sol
pragma solidity 0.5.16;
interface IVault {
// the IERC20 part is the share
function underlyingBalanceInVault() external view returns (uint256);
function underlyingBalanceWithInvestment() external view returns (uint256);
function governance() external view returns (address);
function controller() external view returns (address);
function underlying() external view returns (address);
function strategy() external view returns (address);
function setStrategy(address _strategy) external;
function setVaultFractionToInvest(uint256 numerator, uint256 denominator) external;
function deposit(uint256 amountWei) external;
function depositFor(uint256 amountWei, address holder) external;
function withdrawAll() external;
function withdraw(uint256 numberOfShares) external;
function getPricePerFullShare() external view returns (uint256);
function underlyingBalanceWithInvestmentForHolder(address holder) view external returns (uint256);
// hard work should be callable only by the controller (by the hard worker) or by governance
function doHardWork() external;
function rebalance() external;
}
// File: contracts/Controllable.sol
pragma solidity 0.5.16;
contract Controllable is Governable {
constructor(address _storage) Governable(_storage) public {
}
modifier onlyController() {
require(store.isController(msg.sender), "Not a controller");
_;
}
modifier onlyControllerOrGovernance(){
require((store.isController(msg.sender) || store.isGovernance(msg.sender)),
"The caller must be controller or governance");
_;
}
function controller() public view returns (address) {
return store.controller();
}
}
// File: contracts/Vault.sol
pragma solidity 0.5.16;
contract Vault is ERC20, ERC20Detailed, IVault, Controllable {
using SafeERC20 for IERC20;
using Address for address;
using SafeMath for uint256;
event Withdraw(address indexed beneficiary, uint256 amount);
event Deposit(address indexed beneficiary, uint256 amount);
event Invest(uint256 amount);
IStrategy public strategy;
IERC20 public underlying;
uint256 public underlyingUnit;
mapping(address => uint256) public contributions;
mapping(address => uint256) public withdrawals;
uint256 public vaultFractionToInvestNumerator;
uint256 public vaultFractionToInvestDenominator;
constructor(address _storage,
address _underlying,
uint256 _toInvestNumerator,
uint256 _toInvestDenominator
) ERC20Detailed(
string(abi.encodePacked("FARM_", ERC20Detailed(_underlying).symbol())),
string(abi.encodePacked("f", ERC20Detailed(_underlying).symbol())),
ERC20Detailed(_underlying).decimals()
) Controllable(_storage) public {
underlying = IERC20(_underlying);
require(_toInvestNumerator <= _toInvestDenominator, "cannot invest more than 100%");
require(_toInvestDenominator != 0, "cannot divide by 0");
vaultFractionToInvestDenominator = _toInvestDenominator;
vaultFractionToInvestNumerator = _toInvestNumerator;
underlyingUnit = 10 ** uint256(ERC20Detailed(address(underlying)).decimals());
}
modifier whenStrategyDefined() {
require(address(strategy) != address(0), "Strategy must be defined");
_;
}
// Only smart contracts will be affected by this modifier
modifier defense() {
require(
(msg.sender == tx.origin) || // If it is a normal user and not smart contract,
// then the requirement will pass
!IController(controller()).greyList(msg.sender), // If it is a smart contract, then
"This smart contract has been grey listed" // make sure that it is not on our greyList.
);
_;
}
/**
* Chooses the best strategy and re-invests. If the strategy did not change, it just calls
* doHardWork on the current strategy. Call this through controller to claim hard rewards.
*/
function doHardWork() whenStrategyDefined onlyControllerOrGovernance external {
// ensure that new funds are invested too
invest();
strategy.doHardWork();
}
/*
* Returns the cash balance across all users in this contract.
*/
function underlyingBalanceInVault() view public returns (uint256) {
return underlying.balanceOf(address(this));
}
/* Returns the current underlying (e.g., DAI's) balance together with
* the invested amount (if DAI is invested elsewhere by the strategy).
*/
function underlyingBalanceWithInvestment() view public returns (uint256) {
if (address(strategy) == address(0)) {
// initial state, when not set
return underlyingBalanceInVault();
}
return underlyingBalanceInVault().add(strategy.investedUnderlyingBalance());
}
/*
* Allows for getting the total contributions ever made.
*/
function getContributions(address holder) view public returns (uint256) {
return contributions[holder];
}
/*
* Allows for getting the total withdrawals ever made.
*/
function getWithdrawals(address holder) view public returns (uint256) {
return withdrawals[holder];
}
function getPricePerFullShare() public view returns (uint256) {
return totalSupply() == 0
? underlyingUnit
: underlyingUnit.mul(underlyingBalanceWithInvestment()).div(totalSupply());
}
/* get the user's share (in underlying)
*/
function underlyingBalanceWithInvestmentForHolder(address holder) view external returns (uint256) {
if (totalSupply() == 0) {
return 0;
}
return underlyingBalanceWithInvestment()
.mul(balanceOf(holder))
.div(totalSupply());
}
function setStrategy(address _strategy) public onlyControllerOrGovernance {
require(_strategy != address(0), "new _strategy cannot be empty");
require(IStrategy(_strategy).underlying() == address(underlying), "Vault underlying must match Strategy underlying");
require(IStrategy(_strategy).vault() == address(this), "the strategy does not belong to this vault");
if (address(_strategy) != address(strategy)) {
if (address(strategy) != address(0)) { // if the original strategy (no underscore) is defined
underlying.safeApprove(address(strategy), 0);
strategy.withdrawAllToVault();
}
strategy = IStrategy(_strategy);
underlying.safeApprove(address(strategy), 0);
underlying.safeApprove(address(strategy), uint256(~0));
}
}
function setVaultFractionToInvest(uint256 numerator, uint256 denominator) external onlyGovernance {
require(denominator > 0, "denominator must be greater than 0");
require(numerator < denominator, "denominator must be greater than numerator");
vaultFractionToInvestNumerator = numerator;
vaultFractionToInvestDenominator = denominator;
}
function rebalance() external onlyControllerOrGovernance {
withdrawAll();
invest();
}
function availableToInvestOut() public view returns (uint256) {
uint256 wantInvestInTotal = underlyingBalanceWithInvestment()
.mul(vaultFractionToInvestNumerator)
.div(vaultFractionToInvestDenominator);
uint256 alreadyInvested = strategy.investedUnderlyingBalance();
if (alreadyInvested >= wantInvestInTotal) {
return 0;
} else {
uint256 remainingToInvest = wantInvestInTotal.sub(alreadyInvested);
return remainingToInvest <= underlyingBalanceInVault()
// TODO: we think that the "else" branch of the ternary operation is not
// going to get hit
? remainingToInvest : underlyingBalanceInVault();
}
}
function invest() internal whenStrategyDefined {
uint256 availableAmount = availableToInvestOut();
if (availableAmount > 0) {
underlying.safeTransfer(address(strategy), availableAmount);
emit Invest(availableAmount);
}
}
/*
* Allows for depositing the underlying asset in exchange for shares.
* Approval is assumed.
*/
function deposit(uint256 amount) external defense {
_deposit(amount, msg.sender, msg.sender);
}
/*
* Allows for depositing the underlying asset in exchange for shares
* assigned to the holder.
* This facilitates depositing for someone else (using DepositHelper)
*/
function depositFor(uint256 amount, address holder) public defense {
_deposit(amount, msg.sender, holder);
}
function withdrawAll() public onlyControllerOrGovernance whenStrategyDefined {
strategy.withdrawAllToVault();
}
function withdraw(uint256 numberOfShares) external {
require(totalSupply() > 0, "Vault has no shares");
require(numberOfShares > 0, "numberOfShares must be greater than 0");
uint256 totalSupply = totalSupply();
_burn(msg.sender, numberOfShares);
uint256 underlyingAmountToWithdraw = underlyingBalanceWithInvestment()
.mul(numberOfShares)
.div(totalSupply);
if (underlyingAmountToWithdraw > underlyingBalanceInVault()) {
// withdraw everything from the strategy to accurately check the share value
if (numberOfShares == totalSupply) {
strategy.withdrawAllToVault();
} else {
uint256 missing = underlyingAmountToWithdraw.sub(underlyingBalanceInVault());
strategy.withdrawToVault(missing);
}
// recalculate to improve accuracy
underlyingAmountToWithdraw = Math.min(underlyingBalanceWithInvestment()
.mul(numberOfShares)
.div(totalSupply), underlyingBalanceInVault());
}
underlying.safeTransfer(msg.sender, underlyingAmountToWithdraw);
// update the withdrawal amount for the holder
withdrawals[msg.sender] = withdrawals[msg.sender].add(underlyingAmountToWithdraw);
emit Withdraw(msg.sender, underlyingAmountToWithdraw);
}
function _deposit(uint256 amount, address sender, address beneficiary) internal {
require(amount > 0, "Cannot deposit 0");
require(beneficiary != address(0), "holder must be defined");
if (address(strategy) != address(0)) {
require(strategy.depositArbCheck(), "Too much arb");
}
/*
todo: Potentially exploitable with a flashloan if
strategy under-reports the value.
*/
uint256 toMint = totalSupply() == 0
? amount
: amount.mul(totalSupply()).div(underlyingBalanceWithInvestment());
_mint(beneficiary, toMint);
underlying.safeTransferFrom(sender, address(this), amount);
// update the contribution amount for the beneficiary
contributions[beneficiary] = contributions[beneficiary].add(amount);
emit Deposit(beneficiary, amount);
}
}
// File: contracts/vaults/VaultUSDC.sol
pragma solidity 0.5.16;
contract VaultUSDC is Vault {
constructor(address _controller,
address _underlying,
uint256 _toInvestNumerator,
uint256 _toInvestDenominator
) Vault(
_controller,
_underlying,
_toInvestNumerator,
_toInvestDenominator
) public {
}
}