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0xa9f731e5122953791b69180978EdF3A03d285771
 

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0x60806040120358592021-03-14 9:21:191268 days ago1615713679IN
 Create: Vault
0 ETH0.61059862145

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Contract Source Code Verified (Exact Match)

Contract Name:
Vault

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 19 : Vault.sol
pragma solidity 0.5.16;

import "@openzeppelin/contracts-ethereum-package/contracts/math/Math.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20Detailed.sol";
import "@openzeppelin/contracts-ethereum-package/contracts/utils/ReentrancyGuard.sol";
import "./interfaces/IStrategy.sol";
import "./interfaces/IController.sol";
import "./interfaces/IVault.sol";
import "./interfaces/IUpgradeSource.sol";
import "./ControllableInit.sol";
import "./VaultStorage.sol";

contract Vault is
    ERC20,
    ERC20Detailed,
    IVault,
    IUpgradeSource,
    ControllableInit,
    VaultStorage,
    ReentrancyGuard
{
    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);
    event StrategyAnnounced(address newStrategy, uint256 time);
    event StrategyChanged(address newStrategy, address oldStrategy);

    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()).whiteList(msg.sender),
            "Access denied for caller"
        );
        _;
    }

    // the function is name differently to not cause inheritance clash in truffle and allows tests
    function initializeVault(
        address _storage,
        address _underlying,
        uint256 _toInvestNumerator,
        uint256 _toInvestDenominator,
        uint256 _withdrawFee,
        uint256 _maxDepositCap
    ) public initializer {
        require(
            _toInvestNumerator <= _toInvestDenominator,
            "cannot invest more than 100%"
        );
        require(_toInvestDenominator != 0, "cannot divide by 0");

        ERC20Detailed.initialize(
            string(
                abi.encodePacked("FORCE_", ERC20Detailed(_underlying).symbol())
            ),
            string(abi.encodePacked("x", ERC20Detailed(_underlying).symbol())),
            ERC20Detailed(_underlying).decimals()
        );
        ControllableInit.initialize(_storage);
        ReentrancyGuard.initialize();

        uint256 underlyingUnit =
            10**uint256(ERC20Detailed(address(_underlying)).decimals());
        uint256 implementationDelay = 12 hours;
        uint256 strategyChangeDelay = 12 hours;
        VaultStorage.initialize(
            _underlying,
            _toInvestNumerator,
            _toInvestDenominator,
            underlyingUnit,
            _withdrawFee,
            _maxDepositCap,
            implementationDelay,
            strategyChangeDelay
        );
    }

    function strategy() public view returns (address) {
        return _strategy();
    }

    function underlying() public view returns (address) {
        return _underlying();
    }

    function underlyingUnit() public view returns (uint256) {
        return _underlyingUnit();
    }

    function vaultFractionToInvestNumerator() public view returns (uint256) {
        return _vaultFractionToInvestNumerator();
    }

    function vaultFractionToInvestDenominator() public view returns (uint256) {
        return _vaultFractionToInvestDenominator();
    }

    function withdrawFee() public view returns (uint256) {
        return _withdrawFee();
    }

    function totalDeposits() public view returns (uint256) {
        return _totalDeposits();
    }

    function maxDepositCap() public view returns (uint256) {
        return _maxDepositCap();
    }

    function nextImplementation() public view returns (address) {
        return _nextImplementation();
    }

    function nextImplementationTimestamp() public view returns (uint256) {
        return _nextImplementationTimestamp();
    }

    function nextImplementationDelay() public view returns (uint256) {
        return _nextImplementationDelay();
    }

    /**
     * Chooses the best strategy and re-invests. If the strategy did not change, it just calls
     * forceUnleashed on the current strategy. Call this through controller to claim galactic rewards.
     */
    function forceUnleashed()
        external
        whenStrategyDefined
        onlyControllerOrGovernance
    {
        // ensure that new funds are invested too
        invest();
        IStrategy(strategy()).forceUnleashed();
    }

    /*
     * Returns the cash balance across all users in this contract.
     */
    function underlyingBalanceInVault() public view returns (uint256) {
        return IERC20(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() public view returns (uint256) {
        if (address(strategy()) == address(0)) {
            // initial state, when not set
            return underlyingBalanceInVault();
        }
        return
            underlyingBalanceInVault().add(
                IStrategy(strategy()).investedUnderlyingBalance()
            );
    }

    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)
        external
        view
        returns (uint256)
    {
        if (totalSupply() == 0) {
            return 0;
        }
        return
            underlyingBalanceWithInvestment().mul(balanceOf(holder)).div(
                totalSupply()
            );
    }

    function futureStrategy() public view returns (address) {
        return _futureStrategy();
    }

    function strategyUpdateTime() public view returns (uint256) {
        return _strategyUpdateTime();
    }

    function strategyTimeLock() public view returns (uint256) {
        return _strategyTimeLock();
    }

    function canUpdateStrategy(address _strategy) public view returns (bool) {
        return
            strategy() == address(0) || // no strategy was set yet
            (_strategy == futureStrategy() &&
                block.timestamp > strategyUpdateTime() &&
                strategyUpdateTime() > 0); // or the timelock has passed
    }

    /**
     * Indicates that the strategy update will happen in the future
     */
    function announceStrategyUpdate(address _strategy)
        public
        onlyControllerOrGovernance
    {
        // records a new timestamp
        uint256 when = block.timestamp.add(strategyTimeLock());
        _setStrategyUpdateTime(when);
        _setFutureStrategy(_strategy);
        emit StrategyAnnounced(_strategy, when);
    }

    /**
     * Finalizes (or cancels) the strategy update by resetting the data
     */
    function finalizeStrategyUpdate() public onlyControllerOrGovernance {
        _setStrategyUpdateTime(0);
        _setFutureStrategy(address(0));
    }

    function setStrategy(address _strategy) public onlyControllerOrGovernance {
        require(
            canUpdateStrategy(_strategy),
            "The strategy exists and switch timelock did not elapse yet"
        );
        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"
        );

        emit StrategyChanged(_strategy, strategy());
        if (address(_strategy) != address(strategy())) {
            if (address(strategy()) != address(0)) {
                // if the original strategy (no underscore) is defined
                IERC20(underlying()).safeApprove(address(strategy()), 0);
                IStrategy(strategy()).withdrawAllToVault();
            }
            _setStrategy(_strategy);
            IERC20(underlying()).safeApprove(address(strategy()), 0);
            IERC20(underlying()).safeApprove(address(strategy()), uint256(~0));
        }
        finalizeStrategyUpdate();
    }

    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 or equal to the numerator"
        );
        _setVaultFractionToInvestNumerator(numerator);
        _setVaultFractionToInvestDenominator(denominator);
    }

    function setWithdrawFee(uint256 value) external onlyGovernance {
        return _setWithdrawFee(value);
    }

    function setMaxDepositCap(uint256 value) external onlyGovernance {
        return _setMaxDepositCap(value);
    }

    function rebalance() external onlyControllerOrGovernance {
        withdrawAll();
        invest();
    }

    function availableToInvestOut() public view returns (uint256) {
        uint256 wantInvestInTotal =
            underlyingBalanceWithInvestment()
                .mul(vaultFractionToInvestNumerator())
                .div(vaultFractionToInvestDenominator());
        uint256 alreadyInvested =
            IStrategy(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) {
            IERC20(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
    {
        IStrategy(strategy()).withdrawAllToVault();
    }

    function withdraw(uint256 numberOfShares) external defense nonReentrant {
        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
            );
        uint256 originalDepositsToWithdraw =
            _totalDeposits().mul(numberOfShares).div(totalSupply);
        if (underlyingAmountToWithdraw > underlyingBalanceInVault()) {
            // withdraw everything from the strategy to accurately check the share value
            if (numberOfShares == totalSupply) {
                IStrategy(strategy()).withdrawAllToVault();
            } else {
                uint256 missing =
                    underlyingAmountToWithdraw.sub(underlyingBalanceInVault());
                IStrategy(strategy()).withdrawToVault(missing);
            }
            // recalculate to improve accuracy
            underlyingAmountToWithdraw = Math.min(
                underlyingBalanceWithInvestment().mul(numberOfShares).div(
                    totalSupply
                ),
                underlyingBalanceInVault()
            );
        }

        uint256 fee = underlyingAmountToWithdraw.mul(withdrawFee()).div(1000);
        IERC20(underlying()).safeTransfer(
            msg.sender,
            underlyingAmountToWithdraw.sub(fee)
        );

        _setTotalDeposits(_totalDeposits().sub(originalDepositsToWithdraw));
        if (fee > 0) {
            IERC20(underlying()).safeTransfer(
                IController(controller()).treasury(),
                fee
            );
        }
        // update the withdrawal amount for the holder
        emit Withdraw(msg.sender, underlyingAmountToWithdraw);
    }

    function _deposit(
        uint256 amount,
        address sender,
        address beneficiary
    ) internal nonReentrant {
        require(amount > 0, "Cannot deposit 0");
        require(beneficiary != address(0), "holder must be defined");
        require(
            maxDepositCap() == 0 ||
                totalDeposits().add(amount) <= maxDepositCap(),
            "Cannot deposit more than cap"
        );

        if (address(strategy()) != address(0)) {
            require(IStrategy(strategy()).depositArbCheck(), "Too much arb");
        }

        uint256 toMint =
            totalSupply() == 0
                ? amount
                : amount.mul(totalSupply()).div(
                    underlyingBalanceWithInvestment()
                );
        _mint(beneficiary, toMint);

        IERC20(underlying()).safeTransferFrom(sender, address(this), amount);
        _setTotalDeposits(_totalDeposits().add(amount));
        // update the contribution amount for the beneficiary
        emit Deposit(beneficiary, amount);
    }

    /**
     * Schedules an upgrade for this vault's proxy.
     */
    function scheduleUpgrade(address impl) public onlyGovernance {
        _setNextImplementation(impl);
        _setNextImplementationTimestamp(
            block.timestamp.add(nextImplementationDelay())
        );
    }

    function shouldUpgrade() external view returns (bool, address) {
        return (
            nextImplementationTimestamp() != 0 &&
                block.timestamp > nextImplementationTimestamp() &&
                nextImplementation() != address(0),
            nextImplementation()
        );
    }

    function finalizeUpgrade() external onlyGovernance {
        _setNextImplementation(address(0));
        _setNextImplementationTimestamp(0);
    }
}

File 2 of 19 : ControllableInit.sol
pragma solidity 0.5.16;

import "./GovernableInit.sol";

// A clone of Governable supporting the Initializable interface and pattern
contract ControllableInit is GovernableInit {
    constructor() public {}

    function initialize(address _storage) public initializer {
        GovernableInit.initialize(_storage);
    }

    modifier onlyController() {
        require(
            Storage(_storage()).isController(msg.sender),
            "Not a controller"
        );
        _;
    }

    modifier onlyControllerOrGovernance() {
        require(
            (Storage(_storage()).isController(msg.sender) ||
                Storage(_storage()).isGovernance(msg.sender)),
            "The caller must be controller or governance"
        );
        _;
    }

    function controller() public view returns (address) {
        return Storage(_storage()).controller();
    }
}

File 3 of 19 : GovernableInit.sol
pragma solidity 0.5.16;

import "@openzeppelin/upgrades/contracts/Initializable.sol";
import "./Storage.sol";

// A clone of Governable supporting the Initializable interface and pattern
contract GovernableInit is Initializable {
    bytes32 internal constant _STORAGE_SLOT =
        0xa7ec62784904ff31cbcc32d09932a58e7f1e4476e1d041995b37c917990b16dc;

    modifier onlyGovernance() {
        require(Storage(_storage()).isGovernance(msg.sender), "Not governance");
        _;
    }

    constructor() public {
        assert(
            _STORAGE_SLOT ==
                bytes32(
                    uint256(keccak256("eip1967.governableInit.storage")) - 1
                )
        );
    }

    function initialize(address _store) public initializer {
        _setStorage(_store);
    }

    function _setStorage(address newStorage) private {
        bytes32 slot = _STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newStorage)
        }
    }

    function setStorage(address _store) public onlyGovernance {
        require(_store != address(0), "new storage shouldn't be empty");
        _setStorage(_store);
    }

    function _storage() internal view returns (address str) {
        bytes32 slot = _STORAGE_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            str := sload(slot)
        }
    }

    function governance() public view returns (address) {
        return Storage(_storage()).governance();
    }
}

File 4 of 19 : 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 5 of 19 : VaultStorage.sol
pragma solidity 0.5.16;

import "@openzeppelin/upgrades/contracts/Initializable.sol";

contract VaultStorage is Initializable {
    bytes32 internal constant _STRATEGY_SLOT =
        0xf1a169aa0f736c2813818fdfbdc5755c31e0839c8f49831a16543496b28574ea;
    bytes32 internal constant _UNDERLYING_SLOT =
        0x1994607607e11d53306ef62e45e3bd85762c58d9bf38b5578bc4a258a26a7371;
    bytes32 internal constant _UNDERLYING_UNIT_SLOT =
        0xa66bc57d4b4eed7c7687876ca77997588987307cb13ecc23f5e52725192e5fff;
    bytes32 internal constant _VAULT_FRACTION_TO_INVEST_NUMERATOR_SLOT =
        0x39122c9adfb653455d0c05043bd52fcfbc2be864e832efd3abc72ce5a3d7ed5a;
    bytes32 internal constant _VAULT_FRACTION_TO_INVEST_DENOMINATOR_SLOT =
        0x469a3bad2fab7b936c45eecd1f5da52af89cead3e2ed7f732b6f3fc92ed32308;
    bytes32 internal constant _NEXT_IMPLEMENTATION_SLOT =
        0xb1acf527cd7cd1668b30e5a9a1c0d845714604de29ce560150922c9d8c0937df;
    bytes32 internal constant _NEXT_IMPLEMENTATION_TIMESTAMP_SLOT =
        0x3bc747f4b148b37be485de3223c90b4468252967d2ea7f9fcbd8b6e653f434c9;
    bytes32 internal constant _NEXT_IMPLEMENTATION_DELAY_SLOT =
        0x82ddc3be3f0c1a6870327f78f4979a0b37b21b16736ef5be6a7a7a35e530bcf0;
    bytes32 internal constant _STRATEGY_TIME_LOCK_SLOT =
        0x6d02338b2e4c913c0f7d380e2798409838a48a2c4d57d52742a808c82d713d8b;
    bytes32 internal constant _FUTURE_STRATEGY_SLOT =
        0xb441b53a4e42c2ca9182bc7ede99bedba7a5d9360d9dfbd31fa8ee2dc8590610;
    bytes32 internal constant _STRATEGY_UPDATE_TIME_SLOT =
        0x56e7c0e75875c6497f0de657009613a32558904b5c10771a825cc330feff7e72;
    bytes32 internal constant _WITHDRAW_FEE =
        0x3405c96d34f8f0e36eac648034ca7e687437f795bbdbdc2cb7db90a89d519f57;
    bytes32 internal constant _TOTAL_DEPOSITS =
        0xaf765835ed5af0d235b6c686724ad31fa90e06b3daf1c074d6cc398b8fcef213;
    bytes32 internal constant _MAX_DEPOSIT_CAP =
        0x0df75d4bdb87be8e3e04e1dc08ec1c98ed6c4147138e5789f0bd448c5c8e1e28;

    constructor() public {
        assert(
            _STRATEGY_SLOT ==
                bytes32(uint256(keccak256("eip1967.vaultStorage.strategy")) - 1)
        );
        assert(
            _UNDERLYING_SLOT ==
                bytes32(
                    uint256(keccak256("eip1967.vaultStorage.underlying")) - 1
                )
        );
        assert(
            _UNDERLYING_UNIT_SLOT ==
                bytes32(
                    uint256(keccak256("eip1967.vaultStorage.underlyingUnit")) -
                        1
                )
        );
        assert(
            _VAULT_FRACTION_TO_INVEST_NUMERATOR_SLOT ==
                bytes32(
                    uint256(
                        keccak256(
                            "eip1967.vaultStorage.vaultFractionToInvestNumerator"
                        )
                    ) - 1
                )
        );
        assert(
            _VAULT_FRACTION_TO_INVEST_DENOMINATOR_SLOT ==
                bytes32(
                    uint256(
                        keccak256(
                            "eip1967.vaultStorage.vaultFractionToInvestDenominator"
                        )
                    ) - 1
                )
        );
        assert(
            _NEXT_IMPLEMENTATION_SLOT ==
                bytes32(
                    uint256(
                        keccak256("eip1967.vaultStorage.nextImplementation")
                    ) - 1
                )
        );
        assert(
            _NEXT_IMPLEMENTATION_TIMESTAMP_SLOT ==
                bytes32(
                    uint256(
                        keccak256(
                            "eip1967.vaultStorage.nextImplementationTimestamp"
                        )
                    ) - 1
                )
        );
        assert(
            _NEXT_IMPLEMENTATION_DELAY_SLOT ==
                bytes32(
                    uint256(
                        keccak256(
                            "eip1967.vaultStorage.nextImplementationDelay"
                        )
                    ) - 1
                )
        );
        assert(
            _STRATEGY_TIME_LOCK_SLOT ==
                bytes32(
                    uint256(
                        keccak256("eip1967.vaultStorage.strategyTimeLock")
                    ) - 1
                )
        );
        assert(
            _FUTURE_STRATEGY_SLOT ==
                bytes32(
                    uint256(keccak256("eip1967.vaultStorage.futureStrategy")) -
                        1
                )
        );
        assert(
            _STRATEGY_UPDATE_TIME_SLOT ==
                bytes32(
                    uint256(
                        keccak256("eip1967.vaultStorage.strategyUpdateTime")
                    ) - 1
                )
        );
        assert(
            _WITHDRAW_FEE ==
                bytes32(
                    uint256(keccak256("eip1967.vaultStorage.withdrawFee")) - 1
                )
        );
        assert(
            _TOTAL_DEPOSITS ==
                bytes32(
                    uint256(keccak256("eip1967.vaultStorage.totalDeposits")) - 1
                )
        );
        assert(
            _MAX_DEPOSIT_CAP ==
                bytes32(
                    uint256(keccak256("eip1967.vaultStorage.maxDepositCap")) - 1
                )
        );
    }

    function initialize(
        address _underlying,
        uint256 _toInvestNumerator,
        uint256 _toInvestDenominator,
        uint256 _underlyingUnit,
        uint256 _withdrawFee_,
        uint256 _maxDepositCap_,
        uint256 _implementationChangeDelay,
        uint256 _strategyChangeDelay
    ) public initializer {
        _setUnderlying(_underlying);
        _setVaultFractionToInvestNumerator(_toInvestNumerator);
        _setVaultFractionToInvestDenominator(_toInvestDenominator);
        _setWithdrawFee(_withdrawFee_);
        _setMaxDepositCap(_maxDepositCap_);
        _setUnderlyingUnit(_underlyingUnit);
        _setNextImplementationDelay(_implementationChangeDelay);
        _setStrategyTimeLock(_strategyChangeDelay);
        _setStrategyUpdateTime(0);
        _setFutureStrategy(address(0));
    }

    function _setStrategy(address _address) internal {
        setAddress(_STRATEGY_SLOT, _address);
    }

    function _strategy() internal view returns (address) {
        return getAddress(_STRATEGY_SLOT);
    }

    function _setUnderlying(address _address) internal {
        setAddress(_UNDERLYING_SLOT, _address);
    }

    function _underlying() internal view returns (address) {
        return getAddress(_UNDERLYING_SLOT);
    }

    function _setUnderlyingUnit(uint256 _value) internal {
        setUint256(_UNDERLYING_UNIT_SLOT, _value);
    }

    function _underlyingUnit() internal view returns (uint256) {
        return getUint256(_UNDERLYING_UNIT_SLOT);
    }

    function _setVaultFractionToInvestNumerator(uint256 _value) internal {
        setUint256(_VAULT_FRACTION_TO_INVEST_NUMERATOR_SLOT, _value);
    }

    function _vaultFractionToInvestNumerator() internal view returns (uint256) {
        return getUint256(_VAULT_FRACTION_TO_INVEST_NUMERATOR_SLOT);
    }

    function _setVaultFractionToInvestDenominator(uint256 _value) internal {
        setUint256(_VAULT_FRACTION_TO_INVEST_DENOMINATOR_SLOT, _value);
    }

    function _vaultFractionToInvestDenominator()
        internal
        view
        returns (uint256)
    {
        return getUint256(_VAULT_FRACTION_TO_INVEST_DENOMINATOR_SLOT);
    }

    function _setWithdrawFee(uint256 _value) internal {
        setUint256(_WITHDRAW_FEE, _value);
    }

    function _withdrawFee() internal view returns (uint256) {
        return getUint256(_WITHDRAW_FEE);
    }

    function _setTotalDeposits(uint256 _value) internal {
        setUint256(_TOTAL_DEPOSITS, _value);
    }

    function _totalDeposits() internal view returns (uint256) {
        return getUint256(_TOTAL_DEPOSITS);
    }

    function _setMaxDepositCap(uint256 _value) internal {
        setUint256(_MAX_DEPOSIT_CAP, _value);
    }

    function _maxDepositCap() internal view returns (uint256) {
        return getUint256(_MAX_DEPOSIT_CAP);
    }

    function _setNextImplementation(address _address) internal {
        setAddress(_NEXT_IMPLEMENTATION_SLOT, _address);
    }

    function _nextImplementation() internal view returns (address) {
        return getAddress(_NEXT_IMPLEMENTATION_SLOT);
    }

    function _setNextImplementationTimestamp(uint256 _value) internal {
        setUint256(_NEXT_IMPLEMENTATION_TIMESTAMP_SLOT, _value);
    }

    function _nextImplementationTimestamp() internal view returns (uint256) {
        return getUint256(_NEXT_IMPLEMENTATION_TIMESTAMP_SLOT);
    }

    function _setNextImplementationDelay(uint256 _value) internal {
        setUint256(_NEXT_IMPLEMENTATION_DELAY_SLOT, _value);
    }

    function _nextImplementationDelay() internal view returns (uint256) {
        return getUint256(_NEXT_IMPLEMENTATION_DELAY_SLOT);
    }

    function _setStrategyTimeLock(uint256 _value) internal {
        setUint256(_STRATEGY_TIME_LOCK_SLOT, _value);
    }

    function _strategyTimeLock() internal view returns (uint256) {
        return getUint256(_STRATEGY_TIME_LOCK_SLOT);
    }

    function _setFutureStrategy(address _value) internal {
        setAddress(_FUTURE_STRATEGY_SLOT, _value);
    }

    function _futureStrategy() internal view returns (address) {
        return getAddress(_FUTURE_STRATEGY_SLOT);
    }

    function _setStrategyUpdateTime(uint256 _value) internal {
        setUint256(_STRATEGY_UPDATE_TIME_SLOT, _value);
    }

    function _strategyUpdateTime() internal view returns (uint256) {
        return getUint256(_STRATEGY_UPDATE_TIME_SLOT);
    }

    function setAddress(bytes32 slot, address _address) private {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, _address)
        }
    }

    function setUint256(bytes32 slot, uint256 _value) private {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, _value)
        }
    }

    function getAddress(bytes32 slot) private view returns (address str) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            str := sload(slot)
        }
    }

    function getUint256(bytes32 slot) private view returns (uint256 str) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            str := sload(slot)
        }
    }

    uint256[50] private ______gap;
}

File 6 of 19 : IController.sol
pragma solidity 0.5.16;

interface IController {
    function whiteList(address _target) external view returns (bool);

    function addVaultAndStrategy(address _vault, address _strategy) external;

    function forceUnleashed(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);

    function treasury() external view returns (address);
}

File 7 of 19 : 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 forceUnleashed() external;

    function depositArbCheck() external view returns (bool);
}

File 8 of 19 : IUpgradeSource.sol
pragma solidity 0.5.16;

interface IUpgradeSource {
    function shouldUpgrade() external view returns (bool, address);

    function finalizeUpgrade() external;
}

File 9 of 19 : IVault.sol
pragma solidity 0.5.16;

interface IVault {
    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)
        external
        view
        returns (uint256);

    // force unleash should be callable only by the controller (by the force unleasher) or by governance
    function forceUnleashed() external;

    function rebalance() external;
}

File 10 of 19 : Context.sol
pragma solidity ^0.5.0;

import "@openzeppelin/upgrades/contracts/Initializable.sol";

/*
 * @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 is Initializable {
    // 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 11 of 19 : 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 12 of 19 : 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 13 of 19 : ERC20.sol
pragma solidity ^0.5.0;

import "@openzeppelin/upgrades/contracts/Initializable.sol";

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {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 Initializable, 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"));
    }

    uint256[50] private ______gap;
}

File 14 of 19 : ERC20Detailed.sol
pragma solidity ^0.5.0;

import "@openzeppelin/upgrades/contracts/Initializable.sol";
import "./IERC20.sol";

/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is Initializable, 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.
     */
    function initialize(string memory name, string memory symbol, uint8 decimals) public initializer {
        _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;
    }

    uint256[50] private ______gap;
}

File 15 of 19 : 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 16 of 19 : SafeERC20.sol
pragma solidity ^0.5.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @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 17 of 19 : 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 18 of 19 : ReentrancyGuard.sol
pragma solidity ^0.5.0;

import "@openzeppelin/upgrades/contracts/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard is Initializable {
    // counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    function initialize() public initializer {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
    }

    uint256[50] private ______gap;
}

File 19 of 19 : Initializable.sol
pragma solidity >=0.4.24 <0.7.0;


/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
contract Initializable {

  /**
   * @dev Indicates that the contract has been initialized.
   */
  bool private initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private initializing;

  /**
   * @dev Modifier to use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");

    bool isTopLevelCall = !initializing;
    if (isTopLevelCall) {
      initializing = true;
      initialized = true;
    }

    _;

    if (isTopLevelCall) {
      initializing = false;
    }
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    address self = address(this);
    uint256 cs;
    assembly { cs := extcodesize(self) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.