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//SPDX-License-Identifier: Unlicense
pragma solidity 0.5.16;
// import "openzeppelin-solidity2/contracts/crowdsale/Crowdsale.sol";
// import "openzeppelin-solidity2/contracts/crowdsale/distribution/PostDeliveryCrowdsale.sol";
// import "openzeppelin-solidity2/contracts/crowdsale/validation/TimedCrowdsale.sol";
// import "openzeppelin-solidity2/contracts/math/SafeMath.sol";
// import "openzeppelin-solidity2/contracts/ownership/Ownable.sol";
import "openzeppelin-solidity2/crowdsale/Crowdsale.sol";
import "openzeppelin-solidity2/crowdsale/distribution/PostDeliveryCrowdsale.sol";
import "openzeppelin-solidity2/crowdsale/validation/TimedCrowdsale.sol";
import "openzeppelin-solidity2/math/SafeMath.sol";
import "openzeppelin-solidity2/ownership/Ownable.sol";
import "./Staker.sol";
import "./stakingToken.sol";

contract ERC20IDO is IERC20 {
  function setStartTimestamp(uint256 _newStart) external;
}

contract F9CrowdSale is Crowdsale, TimedCrowdsale, PostDeliveryCrowdsale, Ownable {
  using SafeMath for uint256;

  Staker public stakingContract;
  address public f9TokenAddress;
  address public dao9TokenAddress;
  IERC20 public tokenInstance;

  // Have minimum and maximum contributions
  uint256 public investorMinCap = .02 * 10**18;
  uint256 public investorHardCap = 1 * 10**18;
  enum SalePhase {
    PREREGISTRATION,
    F9REGISTRATION,
    DAO9REGISTRATION,
    OPENSALE
  }
  SalePhase phase = SalePhase.PREREGISTRATION;

  // Track investor contributions
  mapping(address => uint256) private contributions;
  // Track registrants
  mapping(address => uint256) private multiplier;

  bool public salesOpen = false;
  uint256 public tokenBalance;
  uint256 public IDOrate;
  uint256[3] public dao9Tier = [9999 * 10**18, 49999 * 10**18, 99999 * 10**18];

  event TokensPurchasedTimestamp(uint256 date, address indexed beneficiary, uint256 amount);

  event Registered(uint256 date, address indexed beneficiary, uint256 allocationMultiple);
  event withdrawRemaining(uint256 amount, uint256 timestamp);
  event emergencyWithdrawal(uint256 amount, uint256 timestamp);
  event updateDAO9TierLevels(
    uint256 lowTier,
    uint256 middleTier,
    uint256 highTier,
    uint256 timestamp
  );
  event changeSalePhase(SalePhase newPhase, uint256 timestamp);
  event changeSaleOpen(bool salesOpen, uint256 timestamp);
  event changeRate(uint256 newRate, uint256 timestamp);
  event changeMinCap(uint256 newMinCap, uint256 timestamp);
  event changeMaxCap(uint256 newMaxCap, uint256 timestamp);
  event changeSaleEnd(uint256 newSaleEnd, uint256 timestamp);

  constructor(
    uint256 _rate,
    address payable _wal,
    IERC20 _token,
    uint256 _openingTime,
    uint256 _closingTime,
    Staker _stakingContract,
    address _f9Token,
    address _dao9Token
  )
    public
    Crowdsale(_rate, _wal, _token)
    TimedCrowdsale(_openingTime, _closingTime)
    PostDeliveryCrowdsale()
    Ownable()
  {
    IDOrate = _rate;
    tokenInstance = _token;
    stakingContract = _stakingContract;
    f9TokenAddress = _f9Token;
    dao9TokenAddress = _dao9Token;
  }

  function() external payable {
    revert();
  }

  /**
   * @dev Deposit tokens to be sold in IDO
   * @param tokens number of tokens deposited into contract
   */
  function depositTokens(uint256 tokens) external {
    uint256 amountBefore = tokenInstance.balanceOf(address(this));

    if (amountBefore > tokenBalance) {
      tokenBalance = amountBefore; //update token deposit made through direct transfers
    }

    if (tokens != 0) {
      // Only the sale token specified in the constructor can be deposited
      tokenInstance.transferFrom(_msgSender(), address(this), tokens);
      uint256 amountAfter = tokenInstance.balanceOf(address(this));
      uint256 _amount = amountAfter.sub(amountBefore);
      tokenBalance = tokenBalance.add(_amount);
    }
  }

  /**
   * @dev Owner can withdraw unsold tokens
   */
  function sweepTokens() external onlyOwner {
    uint256 withdrawalAmount = tokenBalance;
    tokenBalance = 0;
    tokenInstance.transfer(_msgSender(), withdrawalAmount);
    emit withdrawRemaining(withdrawalAmount, now);
  }

  /**
   * @dev Failsafe to withdraw in case tokenBalance state variable becomes corrupted
   */
  function emergencyWithdraw() external onlyOwner {
    uint256 withdrawalAmount = tokenInstance.balanceOf(address(this));
    tokenInstance.transfer(_msgSender(), withdrawalAmount);
    emit emergencyWithdrawal(withdrawalAmount, now);
  }

  /**
   * @dev Owner can update the amount of DAO9 tokens required for each tier
   */
  function updateDAO9Tiers(
    uint256 lowTier,
    uint256 middleTier,
    uint256 upperTier
  ) public onlyOwner {
    dao9Tier = [lowTier, middleTier, upperTier];
    stakingContract.updateDAO9Tiers(lowTier, middleTier, upperTier);
    emit updateDAO9TierLevels(lowTier, middleTier, upperTier, now);
  }

  /**
   * @dev Called by user to register for the IDO.
   * 	Determines allocation multiplier, and locks'
   * 	users stake for 12960 minutes
   * @param _token address of token which user is staking
   * 	to participate
   */
  function registerIDO(address _token) external {
    uint256 stakedBalance = stakingContract.stakedBalance(IERC20(_token), _msgSender());
    require(stakedBalance > 0, "IDO: No staked tokens to register");
    if (_token == dao9TokenAddress) {
      require(phase == SalePhase.DAO9REGISTRATION, "IDO: Not DAO9 Registration");
      if (stakedBalance >= dao9Tier[2]) {
        multiplier[_msgSender()] = 10;
      } else if (stakedBalance >= dao9Tier[1]) {
        multiplier[_msgSender()] = 5;
      } else if (stakedBalance >= dao9Tier[0]) {
        multiplier[_msgSender()] = 1;
      } else {
        revert("IDO: Insufficient DAO9 stake");
      }
    } else if (_token == f9TokenAddress) {
      require(phase == SalePhase.F9REGISTRATION, "IDO: Not F9 Registration");
      if (stakedBalance >= 4206969 * 10**9) {
        multiplier[_msgSender()] = 420;
      } else if (stakedBalance >= 999999 * 10**9) {
        multiplier[_msgSender()] = 100;
      } else if (stakedBalance >= 499999 * 10**9) {
        multiplier[_msgSender()] = 50;
      } else if (stakedBalance >= 99999 * 10**9) {
        multiplier[_msgSender()] = 10;
      } else if (stakedBalance >= 9999 * 10**9) {
        multiplier[_msgSender()] = 1;
      } else {
        revert("IDO: Insufficient F9 stake");
      }
    }
    emit Registered(now, _msgSender(), multiplier[_msgSender()]);
    stakingContract.lock(_msgSender(), now + 12960 minutes);
  }

  /**
   * @dev Owner can set sale phase.
   *
   * Note that sales are ALSO halted/unhalted by the openSalePeriod() function
   *
   * SalePhase is an enum with three possible values:
   *  PREREGISTRATION (CLOSED) : 0
   * 	F9REGISTRATION : 1
   *  DAO9REGISTRATION : 2
   *  OPENSALE : 3
   *
   * The contract sets the phase to 0 upon deployment and _salesOpen to false.
   *
   * @param _phase current sale phase
   *
   */
  function advanceSalePhase(SalePhase _phase) external onlyOwner {
    phase = _phase;
    emit changeSalePhase(_phase, now);
  }

  function getSalePhase() external view returns (SalePhase) {
    return phase;
  }

  /**
   * @dev Owner can open or close sale period
   * @param _salesOpen boolean true/false: sale period is open
   */
  function openSalePeriod(bool _salesOpen) external onlyOwner {
    salesOpen = _salesOpen;
    emit changeSaleOpen(_salesOpen, now);
  }

  /**
   * @dev Owner can update rate
   * @param _rate uint New Token rate
   */
  function setRate(uint256 _rate) external onlyOwner {
    IDOrate = _rate;
    emit changeRate(_rate, now);
  }

  function rate() public view returns (uint256) {
    return IDOrate;
  }

  /**
   * @dev Owner can update investor minimum
   * @param _minCap uint Minimum individual purchase
   */
  function setMinCap(uint256 _minCap) external onlyOwner {
    investorMinCap = _minCap;
    emit changeMinCap(_minCap, now);
  }

  /**
   * @dev Owner can update investor maximum
   * @param _maxCap uint Maximum individual purchase
   */
  function setMaxCap(uint256 _maxCap) external onlyOwner {
    investorHardCap = _maxCap;
    emit changeMaxCap(_maxCap, now);
  }

  /**
   *  @dev Returns the amount contributed so far by a specific user.
   *  @param _beneficiary Address of contributor
   *  @return User contribution so far
   */
  function getUserContribution(address _beneficiary) public view returns (uint256) {
    return contributions[_beneficiary];
  }

  /**
   * @dev Returns the allocation multiplier for a given registrant
   * @param _registrant address of registrant
   */
  function getMultiplier(address _registrant) external view returns (uint256) {
    return multiplier[_registrant];
  }

  /**
   * @dev Extend parent behavior requiring purchase to respect investor min/max funding cap.
   * @param _beneficiary Token purchaser
   * @param _weiAmount Amount of wei contributed
   */
  function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal view salePeriod {
    require(phase == SalePhase.OPENSALE, "IDO: Not open sale period");
    require(_beneficiary == _msgSender(), "IDO: User may only purchase tokens for themself");
    require(multiplier[_beneficiary] > 0, "IDO: User did not register successfully");
    // Check that contribution respects minimum and maximum caps
    uint256 _existingContribution = contributions[_beneficiary];
    uint256 _newContribution = _existingContribution.add(_weiAmount);
    require(_newContribution >= investorMinCap, "IDO: Must meet minimum investment requirement");
    require(
      _newContribution <= investorHardCap.mul(multiplier[_beneficiary]),
      "IDO: Must not exceed individual allocation"
    );
    super._preValidatePurchase(_beneficiary, _weiAmount);
  }

  /**
   * @dev Updates beneficiary contribution and contract eth balance
   * @param _beneficiary Token purchaser
   * @param _weiAmount Amount of wei contributed
   */
  function _updatePurchasingState(address _beneficiary, uint256 _weiAmount) internal {
    uint256 _existingContribution = contributions[_beneficiary];
    uint256 _newContribution = _existingContribution.add(_weiAmount);
    contributions[_beneficiary] = _newContribution;
    super._updatePurchasingState(_beneficiary, _weiAmount);
  }

  /**
   * @dev Override to extend the way in which ether is converted to tokens.
   * @param weiAmount Value in wei to be converted into tokens
   * @return Number of tokens that can be purchased with the specified _weiAmount
   */
  function _getTokenAmount(uint256 weiAmount) internal view returns (uint256) {
    return weiAmount.mul(IDOrate);
  }

  /**
   * @dev Delivers tokens after a sale is completed
   * @param _beneficiary Address performing the token purchase
   * @param _tokenAmount Number of tokens to be emitted
   */
  function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal {
    require(tokenBalance >= _tokenAmount, "Not enough token balance");
    tokenBalance = tokenBalance.sub(_tokenAmount);
    tokenInstance.transfer(_beneficiary, _tokenAmount);
    emit TokensPurchasedTimestamp(now, _beneficiary, _tokenAmount);
  }

  /**
   * @dev Dev can extend length of sale if it has not already ended
   * @param _newTime new end-of-sale timestamp
   */
  function extendTime(uint256 _newTime) external onlyOwner {
    _extendTime(_newTime);
    ERC20IDO(address(tokenInstance)).setStartTimestamp(_newTime);
    emit changeSaleEnd(_newTime, now);
  }

  modifier salePeriod() {
    require(salesOpen, "IDO: Not sale period");
    _;
  }
}

pragma solidity 0.5.16;

// import "openzeppelin-solidity2/contracts/GSN/Context.sol";
// import "openzeppelin-solidity2/contracts/token/ERC20/IERC20.sol";
// import "openzeppelin-solidity2/contracts/math/SafeMath.sol";
// import "openzeppelin-solidity2/contracts/utils/Address.sol";
// import "openzeppelin-solidity2/contracts/ownership/Ownable.sol";
import "openzeppelin-solidity2/GSN/Context.sol";
import "openzeppelin-solidity2/token/ERC20/IERC20.sol";
import "openzeppelin-solidity2/math/SafeMath.sol";
import "openzeppelin-solidity2/utils/Address.sol";
import "openzeppelin-solidity2/ownership/Ownable.sol";

contract Staker is Ownable {
  using SafeMath for uint256;
  using Address for address;

  IERC20 public f9token;
  IERC20 public dao9token;
  mapping(address => mapping(address => uint256)) _tokenBalances;
  mapping(address => uint256) _unlockTime;
  mapping(address => bool) _isIDO;
  mapping(address => bool) _isF9Staked;
  mapping(address => bool) _isDAO9Staked;
  mapping(address => uint256) _dao9Tier;
  bool public f9Halted;
  bool public dao9Halted;
  uint256[3] public dao9Tiers = [999 * 10**18, 4999 * 10**18, 9999 * 10**18];
  uint256[3] public dao9TiersStaked = [0, 0, 0];
  uint256[3] public dao9TiersMax = [100, 100, 100];

  event updateDAO9StakeCapacity(
    uint256 lowTierMax,
    uint256 middleTierMax,
    uint256 highTierMax,
    uint256 timestamp
  );
  event haltF9Staking(bool f9Halted, uint256 timestamp);
  event haltDAO9Staking(bool dao9Halted, uint256 timestamp);
  event addIDOManager(address indexed account, uint256 timestamp);
  event Stake(address indexed account, uint256 timestamp, uint256 value);
  event Unstake(address indexed account, uint256 timestamp, uint256 value);
  event Lock(address indexed account, uint256 timestamp, uint256 unlockTime, address locker);

  constructor(address _f9, address _dao9token) public {
    f9token = IERC20(_f9);
    dao9token = IERC20(_dao9token);
    dao9Halted = true;
  }

  function stakedBalance(IERC20 token, address account) external view returns (uint256) {
    return _tokenBalances[address(token)][account];
  }

  function unlockTime(address account) external view returns (uint256) {
    return _unlockTime[account];
  }

  function isIDO(address account) external view returns (bool) {
    return _isIDO[account];
  }

  /**
   * @dev Returns a boolean for whether a user has staked F9
   *
   * @param account address for which to check status
   * @return bool - true if user has staked F9
   */
  function isF9Staked(address account) external view returns (bool) {
    return _isF9Staked[account];
  }

  function isDAO9Staked(address account) external view returns (bool) {
    return _isDAO9Staked[account];
  }

  function updateDAO9Tiers(
    uint256 lowTier,
    uint256 middleTier,
    uint256 highTier
  ) external onlyIDO {
    dao9Tiers = [lowTier, middleTier, highTier];
  }

  function updateDAO9TiersMax(
    uint256 lowTierMax,
    uint256 middleTierMax,
    uint256 highTierMax
  ) external onlyOwner {
    dao9TiersMax = [lowTierMax, middleTierMax, highTierMax];
    emit updateDAO9StakeCapacity(lowTierMax, middleTierMax, highTierMax, now);
  }

  function _stake(IERC20 token, uint256 value) internal {
    token.transferFrom(_msgSender(), address(this), value);
    _tokenBalances[address(token)][_msgSender()] = _tokenBalances[address(token)][_msgSender()].add(
      value
    );
    emit Stake(_msgSender(), now, value);
  }

  function _unstake(IERC20 token, uint256 value) internal {
    _tokenBalances[address(token)][_msgSender()] = _tokenBalances[address(token)][_msgSender()].sub(
      value,
      "Staker: insufficient staked balance"
    );
    token.transfer(_msgSender(), value);
    emit Unstake(_msgSender(), now, value);
  }

  /**
   * @dev User calls this function to stake DAO9
   */
  function dao9Stake(uint256 tier) external notDAO9Halted {
    require(
      dao9token.balanceOf(_msgSender()) >= dao9Tiers[tier],
      "Staker: Stake amount exceeds wallet DAO9 balance"
    );
    require(dao9TiersStaked[tier] < dao9TiersMax[tier], "Staker: Pool is full");
    require(_isDAO9Staked[_msgSender()] == false, "Staker: User already staked DAO9");
    require(_isF9Staked[_msgSender()] == false, "Staker: User staked in F9 pool");
    _isDAO9Staked[_msgSender()] = true;
    _dao9Tier[_msgSender()] = tier;
    dao9TiersStaked[tier] += 1;
    _stake(dao9token, dao9Tiers[tier]);
  }

  /**
   * @dev User calls this function to stake F9
   */
  function f9Stake(uint256 value) external notF9Halted {
    require(value > 0, "Staker: unstake value should be greater than 0");
    require(
      f9token.balanceOf(_msgSender()) >= value,
      "Staker: Stake amount exceeds wallet F9 balance"
    );
    require(_isDAO9Staked[_msgSender()] == false, "Staker: User staked in DAO9 pool");
    _isF9Staked[_msgSender()] = true;
    _stake(f9token, value);
  }

  function dao9Unstake() external lockable {
    uint256 _tier = _dao9Tier[_msgSender()];
    require(
      _tokenBalances[address(dao9token)][_msgSender()] > 0,
      "Staker: insufficient staked DAO9"
    );
    dao9TiersStaked[_tier] -= 1;
    _isDAO9Staked[_msgSender()] = false;
    _unstake(dao9token, _tokenBalances[address(dao9token)][_msgSender()]);
  }

  function f9Unstake(uint256 value) external lockable {
    require(value > 0, "Staker: unstake value should be greater than 0");
    require(
      _tokenBalances[address(f9token)][_msgSender()] >= value,
      "Staker: insufficient staked F9 balance"
    );
    _unstake(f9token, value);
    if (_tokenBalances[address(f9token)][_msgSender()] == 0) {
      _isF9Staked[_msgSender()] = false;
    }
  }

  function lock(address user, uint256 unlockAt) external onlyIDO {
    require(unlockAt > now, "Staker: unlock is in the past");
    if (_unlockTime[user] < unlockAt) {
      _unlockTime[user] = unlockAt;
      emit Lock(user, now, unlockAt, _msgSender());
    }
  }

  function f9Halt(bool status) external onlyOwner {
    f9Halted = status;
    emit haltF9Staking(status, now);
  }

  function dao9Halt(bool status) external onlyOwner {
    dao9Halted = status;
    emit haltDAO9Staking(status, now);
  }

  function addIDO(address account) external onlyOwner {
    require(account != address(0), "Staker: cannot be zero address");
    _isIDO[account] = true;
    emit addIDOManager(account, now);
  }

  modifier onlyIDO() {
    require(_isIDO[_msgSender()], "Staker: only IDOs can lock");
    _;
  }

  modifier lockable() {
    require(_unlockTime[_msgSender()] <= now, "Staker: account is locked");
    _;
  }

  modifier notF9Halted() {
    require(!f9Halted, "Staker: F9 deposits are paused");
    _;
  }

  modifier notDAO9Halted() {
    require(!dao9Halted, "Staker: DAO9 deposits are paused");
    _;
  }
}

pragma solidity 0.5.16;

// import "openzeppelin-solidity2/contracts/token/ERC20/ERC20Mintable.sol";
// import "openzeppelin-solidity2/contracts/token/ERC20/ERC20Detailed.sol";
// import "openzeppelin-solidity2/contracts/token/ERC20/ERC20Pausable.sol";
import "openzeppelin-solidity2/token/ERC20/ERC20Mintable.sol";
import "openzeppelin-solidity2/token/ERC20/ERC20Detailed.sol";
import "openzeppelin-solidity2/token/ERC20/ERC20Pausable.sol";

//f9
contract stakingToken is ERC20Pausable, ERC20Mintable, ERC20Detailed {
  constructor(
    string memory _name,
    string memory _symbol,
    uint8 decimals
  ) public ERC20Detailed(_name, _symbol, decimals) ERC20Pausable() {
    _mint(msg.sender, 999999999 * 10**9);
  }

  /**
   * @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 whenNotPaused returns (bool) {
    _transfer(_msgSender(), recipient, amount);
    return true;
  }

  /**
   * @dev Called by a pauser to unpause, returns to normal state.
   */
  // function unpause() public onlyPauser whenPaused {
  //     super.unpause();
  // }
}

pragma solidity ^0.5.0;

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

pragma solidity ^0.5.0;

import "../../GSN/Context.sol";
import "../Roles.sol";

contract MinterRole is Context {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor () internal {
        _addMinter(_msgSender());
    }

    modifier onlyMinter() {
        require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role");
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(_msgSender());
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}

pragma solidity ^0.5.0;

import "../../GSN/Context.sol";
import "../Roles.sol";

contract PauserRole is Context {
    using Roles for Roles.Role;

    event PauserAdded(address indexed account);
    event PauserRemoved(address indexed account);

    Roles.Role private _pausers;

    constructor () internal {
        _addPauser(_msgSender());
    }

    modifier onlyPauser() {
        require(isPauser(_msgSender()), "PauserRole: caller does not have the Pauser role");
        _;
    }

    function isPauser(address account) public view returns (bool) {
        return _pausers.has(account);
    }

    function addPauser(address account) public onlyPauser {
        _addPauser(account);
    }

    function renouncePauser() public {
        _removePauser(_msgSender());
    }

    function _addPauser(address account) internal {
        _pausers.add(account);
        emit PauserAdded(account);
    }

    function _removePauser(address account) internal {
        _pausers.remove(account);
        emit PauserRemoved(account);
    }
}

pragma solidity ^0.5.0;

import "../GSN/Context.sol";
import "../token/ERC20/IERC20.sol";
import "../math/SafeMath.sol";
import "../token/ERC20/SafeERC20.sol";
import "../utils/ReentrancyGuard.sol";

/**
 * @title Crowdsale
 * @dev Crowdsale is a base contract for managing a token crowdsale,
 * allowing investors to purchase tokens with ether. This contract implements
 * such functionality in its most fundamental form and can be extended to provide additional
 * functionality and/or custom behavior.
 * The external interface represents the basic interface for purchasing tokens, and conforms
 * the base architecture for crowdsales. It is *not* intended to be modified / overridden.
 * The internal interface conforms the extensible and modifiable surface of crowdsales. Override
 * the methods to add functionality. Consider using 'super' where appropriate to concatenate
 * behavior.
 */
contract Crowdsale is Context, ReentrancyGuard {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // The token being sold
    IERC20 private _token;

    // Address where funds are collected
    address payable private _wallet;

    // How many token units a buyer gets per wei.
    // The rate is the conversion between wei and the smallest and indivisible token unit.
    // So, if you are using a rate of 1 with a ERC20Detailed token with 3 decimals called TOK
    // 1 wei will give you 1 unit, or 0.001 TOK.
    uint256 private _rate;

    // Amount of wei raised
    uint256 private _weiRaised;

    /**
     * Event for token purchase logging
     * @param purchaser who paid for the tokens
     * @param beneficiary who got the tokens
     * @param value weis paid for purchase
     * @param amount amount of tokens purchased
     */
    event TokensPurchased(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);

    /**
     * @param rate Number of token units a buyer gets per wei
     * @dev The rate is the conversion between wei and the smallest and indivisible
     * token unit. So, if you are using a rate of 1 with a ERC20Detailed token
     * with 3 decimals called TOK, 1 wei will give you 1 unit, or 0.001 TOK.
     * @param wallet Address where collected funds will be forwarded to
     * @param token Address of the token being sold
     */
    constructor (uint256 rate, address payable wallet, IERC20 token) public {
        require(rate > 0, "Crowdsale: rate is 0");
        require(wallet != address(0), "Crowdsale: wallet is the zero address");
        require(address(token) != address(0), "Crowdsale: token is the zero address");

        _rate = rate;
        _wallet = wallet;
        _token = token;
    }

    /**
     * @dev fallback function ***DO NOT OVERRIDE***
     * Note that other contracts will transfer funds with a base gas stipend
     * of 2300, which is not enough to call buyTokens. Consider calling
     * buyTokens directly when purchasing tokens from a contract.
     */
    function () external payable {
        buyTokens(_msgSender());
    }

    /**
     * @return the token being sold.
     */
    function token() public view returns (IERC20) {
        return _token;
    }

    /**
     * @return the address where funds are collected.
     */
    function wallet() public view returns (address payable) {
        return _wallet;
    }

    /**
     * @return the number of token units a buyer gets per wei.
     */
    function rate() public view returns (uint256) {
        return _rate;
    }

    /**
     * @return the amount of wei raised.
     */
    function weiRaised() public view returns (uint256) {
        return _weiRaised;
    }

    /**
     * @dev low level token purchase ***DO NOT OVERRIDE***
     * This function has a non-reentrancy guard, so it shouldn't be called by
     * another `nonReentrant` function.
     * @param beneficiary Recipient of the token purchase
     */
    function buyTokens(address beneficiary) public nonReentrant payable {
        uint256 weiAmount = msg.value;
        _preValidatePurchase(beneficiary, weiAmount);

        // calculate token amount to be created
        uint256 tokens = _getTokenAmount(weiAmount);

        // update state
        _weiRaised = _weiRaised.add(weiAmount);

        _processPurchase(beneficiary, tokens);
        emit TokensPurchased(_msgSender(), beneficiary, weiAmount, tokens);

        _updatePurchasingState(beneficiary, weiAmount);

        _forwardFunds();
        _postValidatePurchase(beneficiary, weiAmount);
    }

    /**
     * @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met.
     * Use `super` in contracts that inherit from Crowdsale to extend their validations.
     * Example from CappedCrowdsale.sol's _preValidatePurchase method:
     *     super._preValidatePurchase(beneficiary, weiAmount);
     *     require(weiRaised().add(weiAmount) <= cap);
     * @param beneficiary Address performing the token purchase
     * @param weiAmount Value in wei involved in the purchase
     */
    function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal view {
        require(beneficiary != address(0), "Crowdsale: beneficiary is the zero address");
        require(weiAmount != 0, "Crowdsale: weiAmount is 0");
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    }

    /**
     * @dev Validation of an executed purchase. Observe state and use revert statements to undo rollback when valid
     * conditions are not met.
     * @param beneficiary Address performing the token purchase
     * @param weiAmount Value in wei involved in the purchase
     */
    function _postValidatePurchase(address beneficiary, uint256 weiAmount) internal view {
        // solhint-disable-previous-line no-empty-blocks
    }

    /**
     * @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends
     * its tokens.
     * @param beneficiary Address performing the token purchase
     * @param tokenAmount Number of tokens to be emitted
     */
    function _deliverTokens(address beneficiary, uint256 tokenAmount) internal {
        _token.safeTransfer(beneficiary, tokenAmount);
    }

    /**
     * @dev Executed when a purchase has been validated and is ready to be executed. Doesn't necessarily emit/send
     * tokens.
     * @param beneficiary Address receiving the tokens
     * @param tokenAmount Number of tokens to be purchased
     */
    function _processPurchase(address beneficiary, uint256 tokenAmount) internal {
        _deliverTokens(beneficiary, tokenAmount);
    }

    /**
     * @dev Override for extensions that require an internal state to check for validity (current user contributions,
     * etc.)
     * @param beneficiary Address receiving the tokens
     * @param weiAmount Value in wei involved in the purchase
     */
    function _updatePurchasingState(address beneficiary, uint256 weiAmount) internal {
        // solhint-disable-previous-line no-empty-blocks
    }

    /**
     * @dev Override to extend the way in which ether is converted to tokens.
     * @param weiAmount Value in wei to be converted into tokens
     * @return Number of tokens that can be purchased with the specified _weiAmount
     */
    function _getTokenAmount(uint256 weiAmount) internal view returns (uint256) {
        return weiAmount.mul(_rate);
    }

    /**
     * @dev Determines how ETH is stored/forwarded on purchases.
     */
    function _forwardFunds() internal {
        _wallet.transfer(msg.value);
    }
}

pragma solidity ^0.5.0;

import "../validation/TimedCrowdsale.sol";
import "../../math/SafeMath.sol";
import "../../ownership/Secondary.sol";
import "../../token/ERC20/IERC20.sol";

/**
 * @title PostDeliveryCrowdsale
 * @dev Crowdsale that locks tokens from withdrawal until it ends.
 */
contract PostDeliveryCrowdsale is TimedCrowdsale {
    using SafeMath for uint256;

    mapping(address => uint256) private _balances;
    __unstable__TokenVault private _vault;

    constructor() public {
        _vault = new __unstable__TokenVault();
    }

    /**
     * @dev Withdraw tokens only after crowdsale ends.
     * @param beneficiary Whose tokens will be withdrawn.
     */
    function withdrawTokens(address beneficiary) public {
        require(hasClosed(), "PostDeliveryCrowdsale: not closed");
        uint256 amount = _balances[beneficiary];
        require(amount > 0, "PostDeliveryCrowdsale: beneficiary is not due any tokens");

        _balances[beneficiary] = 0;
        _vault.transfer(token(), beneficiary, amount);
    }

    /**
     * @return the balance of an account.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev Overrides parent by storing due balances, and delivering tokens to the vault instead of the end user. This
     * ensures that the tokens will be available by the time they are withdrawn (which may not be the case if
     * `_deliverTokens` was called later).
     * @param beneficiary Token purchaser
     * @param tokenAmount Amount of tokens purchased
     */
    function _processPurchase(address beneficiary, uint256 tokenAmount) internal {
        _balances[beneficiary] = _balances[beneficiary].add(tokenAmount);
        _deliverTokens(address(_vault), tokenAmount);
    }
}

/**
 * @title __unstable__TokenVault
 * @dev Similar to an Escrow for tokens, this contract allows its primary account to spend its tokens as it sees fit.
 * This contract is an internal helper for PostDeliveryCrowdsale, and should not be used outside of this context.
 */
// solhint-disable-next-line contract-name-camelcase
contract __unstable__TokenVault is Secondary {
    function transfer(IERC20 token, address to, uint256 amount) public onlyPrimary {
        token.transfer(to, amount);
    }
}

pragma solidity ^0.5.0;

import "../../math/SafeMath.sol";
import "../Crowdsale.sol";

/**
 * @title TimedCrowdsale
 * @dev Crowdsale accepting contributions only within a time frame.
 */
contract TimedCrowdsale is Crowdsale {
    using SafeMath for uint256;

    uint256 private _openingTime;
    uint256 private _closingTime;

    /**
     * Event for crowdsale extending
     * @param newClosingTime new closing time
     * @param prevClosingTime old closing time
     */
    event TimedCrowdsaleExtended(uint256 prevClosingTime, uint256 newClosingTime);

    /**
     * @dev Reverts if not in crowdsale time range.
     */
    modifier onlyWhileOpen {
        require(isOpen(), "TimedCrowdsale: not open");
        _;
    }

    /**
     * @dev Constructor, takes crowdsale opening and closing times.
     * @param openingTime Crowdsale opening time
     * @param closingTime Crowdsale closing time
     */
    constructor (uint256 openingTime, uint256 closingTime) public {
        // solhint-disable-next-line not-rely-on-time
        require(openingTime >= block.timestamp, "TimedCrowdsale: opening time is before current time");
        // solhint-disable-next-line max-line-length
        require(closingTime > openingTime, "TimedCrowdsale: opening time is not before closing time");

        _openingTime = openingTime;
        _closingTime = closingTime;
    }

    /**
     * @return the crowdsale opening time.
     */
    function openingTime() public view returns (uint256) {
        return _openingTime;
    }

    /**
     * @return the crowdsale closing time.
     */
    function closingTime() public view returns (uint256) {
        return _closingTime;
    }

    /**
     * @return true if the crowdsale is open, false otherwise.
     */
    function isOpen() public view returns (bool) {
        // solhint-disable-next-line not-rely-on-time
        return block.timestamp >= _openingTime && block.timestamp <= _closingTime;
    }

    /**
     * @dev Checks whether the period in which the crowdsale is open has already elapsed.
     * @return Whether crowdsale period has elapsed
     */
    function hasClosed() public view returns (bool) {
        // solhint-disable-next-line not-rely-on-time
        return block.timestamp > _closingTime;
    }

    /**
     * @dev Extend parent behavior requiring to be within contributing period.
     * @param beneficiary Token purchaser
     * @param weiAmount Amount of wei contributed
     */
    function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal onlyWhileOpen view {
        super._preValidatePurchase(beneficiary, weiAmount);
    }

    /**
     * @dev Extend crowdsale.
     * @param newClosingTime Crowdsale closing time
     */
    function _extendTime(uint256 newClosingTime) internal {
        require(!hasClosed(), "TimedCrowdsale: already closed");
        // solhint-disable-next-line max-line-length
        require(newClosingTime > _closingTime, "TimedCrowdsale: new closing time is before current closing time");

        emit TimedCrowdsaleExtended(_closingTime, newClosingTime);
        _closingTime = newClosingTime;
    }
}

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;
    }
}

pragma solidity ^0.5.0;

import "../GSN/Context.sol";
import "../access/roles/PauserRole.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Context, PauserRole {
    /**
     * @dev Emitted when the pause is triggered by a pauser (`account`).
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by a pauser (`account`).
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state. Assigns the Pauser role
     * to the deployer.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Called by a pauser to pause, triggers stopped state.
     */
    function pause() public onlyPauser whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Called by a pauser to unpause, returns to normal state.
     */
    function unpause() public onlyPauser whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

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;
    }
}

pragma solidity ^0.5.0;

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

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

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

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

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

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

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

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

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

pragma solidity ^0.5.0;

import "../GSN/Context.sol";
/**
 * @dev A Secondary contract can only be used by its primary account (the one that created it).
 */
contract Secondary is Context {
    address private _primary;

    /**
     * @dev Emitted when the primary contract changes.
     */
    event PrimaryTransferred(
        address recipient
    );

    /**
     * @dev Sets the primary account to the one that is creating the Secondary contract.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _primary = msgSender;
        emit PrimaryTransferred(msgSender);
    }

    /**
     * @dev Reverts if called from any account other than the primary.
     */
    modifier onlyPrimary() {
        require(_msgSender() == _primary, "Secondary: caller is not the primary account");
        _;
    }

    /**
     * @return the address of the primary.
     */
    function primary() public view returns (address) {
        return _primary;
    }

    /**
     * @dev Transfers contract to a new primary.
     * @param recipient The address of new primary.
     */
    function transferPrimary(address recipient) public onlyPrimary {
        require(recipient != address(0), "Secondary: new primary is the zero address");
        _primary = recipient;
        emit PrimaryTransferred(recipient);
    }
}

pragma solidity ^0.5.0;

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 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"));
    }
}

pragma solidity ^0.5.0;

import "./IERC20.sol";

/**
 * @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;
    }
}

pragma solidity ^0.5.0;

import "./ERC20.sol";
import "../../access/roles/MinterRole.sol";

/**
 * @dev Extension of {ERC20} that adds a set of accounts with the {MinterRole},
 * which have permission to mint (create) new tokens as they see fit.
 *
 * At construction, the deployer of the contract is the only minter.
 */
contract ERC20Mintable is ERC20, MinterRole {
    /**
     * @dev See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the {MinterRole}.
     */
    function mint(address account, uint256 amount) public onlyMinter returns (bool) {
        _mint(account, amount);
        return true;
    }
}

pragma solidity ^0.5.0;

import "./ERC20.sol";
import "../../lifecycle/Pausable.sol";

/**
 * @title Pausable token
 * @dev ERC20 with pausable transfers and allowances.
 *
 * Useful if you want to stop trades until the end of a crowdsale, or have
 * an emergency switch for freezing all token transfers in the event of a large
 * bug.
 */
contract ERC20Pausable is ERC20, Pausable {
    function transfer(address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transfer(to, value);
    }

    function transferFrom(address from, address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transferFrom(from, to, value);
    }

    function approve(address spender, uint256 value) public whenNotPaused returns (bool) {
        return super.approve(spender, value);
    }

    function increaseAllowance(address spender, uint256 addedValue) public whenNotPaused returns (bool) {
        return super.increaseAllowance(spender, addedValue);
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public whenNotPaused returns (bool) {
        return super.decreaseAllowance(spender, subtractedValue);
    }
}

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);
}

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");
        }
    }
}

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");
    }
}

pragma solidity ^0.5.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 *
 * _Since v2.5.0:_ this module is now much more gas efficient, given net gas
 * metering changes introduced in the Istanbul hardfork.
 */
contract ReentrancyGuard {
    bool private _notEntered;

    constructor () internal {
        // Storing an initial non-zero value makes deployment a bit more
        // expensive, but in exchange the refund on every call to nonReentrant
        // will be lower in amount. Since refunds are capped to a percetange of
        // the total transaction's gas, it is best to keep them low in cases
        // like this one, to increase the likelihood of the full refund coming
        // into effect.
        _notEntered = true;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_notEntered, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _notEntered = false;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _notEntered = true;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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

-----Decoded View---------------
Arg [0] : _rate (uint256): 173792
Arg [1] : _wal (address): 0x60159352c622C03bf8375B006EA84D1b8eCFc99A
Arg [2] : _token (address): 0x1845966510F14e2f66B8B9568d36cC6dbA4d6845
Arg [3] : _openingTime (uint256): 1685807447
Arg [4] : _closingTime (uint256): 1685818187
Arg [5] : _stakingContract (address): 0x4A0546D0F72a9fe1D76bEb400c6046EfE2d40dc3
Arg [6] : _f9Token (address): 0x38A94e92A19E970c144DEd0B2DD47278CA11CC1F
Arg [7] : _dao9Token (address): 0xDd0ef0B2dE3EFec847a79b4CE4de52c4bb98f488

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000000002a6e0
Arg [1] : 00000000000000000000000060159352c622c03bf8375b006ea84d1b8ecfc99a
Arg [2] : 0000000000000000000000001845966510f14e2f66b8b9568d36cc6dba4d6845
Arg [3] : 00000000000000000000000000000000000000000000000000000000647b6157
Arg [4] : 00000000000000000000000000000000000000000000000000000000647b8b4b
Arg [5] : 0000000000000000000000004a0546d0f72a9fe1d76beb400c6046efe2d40dc3
Arg [6] : 00000000000000000000000038a94e92a19e970c144ded0b2dd47278ca11cc1f
Arg [7] : 000000000000000000000000dd0ef0b2de3efec847a79b4ce4de52c4bb98f488