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• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
•  contract Controlled
•    - function Controlled()
•    - function changeController(address _ne ...
•  contract ApproveAndCallFallBack
•    - function receiveApproval(address from ...
•  contract MiniMeToken is Controlled
•    - function MiniMeToken(
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•    - function doTransfer(address _from, ad ...
•    - function balanceOf(address _owner)
•    - function approve(address _spender, ui ...
•    - function allowance(address _owner, ad ...
•    - function approveAndCall(address _spen ...
•    - function totalSupply()
•    - function balanceOfAt(address _owner, ...
•    - function totalSupplyAt(uint _blockNum ...
•    - function createCloneToken(
•    - function generateTokens(address _owne ...
•    - function destroyTokens(address _owner ...
•    - function enableTransfers(bool _transf ...
•    - function getValueAt(Checkpoint[] stor ...
•    - function updateValueAtNow(Checkpoint[ ...
•    - function isContract(address _addr)
•    - function min(uint a, uint b)
•    - function ()
•    - function claimTokens(address _token)
•  contract MiniMeTokenFactory
•    - function createCloneToken(
•  contract StakeTreeWithTokenization *
•    - function StakeTreeWithTokenization(
•    - function ()
•    - function fund()
•    - function calculateWithdrawalAmount(ui ...
•    - function calculateRefundAmount(uint a ...
•    - function getRefundAmountForFunder(add ...
•    - function getFunderContribution(addres ...
•    - function getBeneficiary()
•    - function getCurrentTotalFunders()
•    - function getWithdrawalCounter()
•    - function getWithdrawalEntryForFunder( ...
•    - function getContractBalance()
•    - function getFunderBalance(address fun ...
•    - function getFunderContributionClaimed ...
•    - function isFunder(address addr)
•    - function isTokenized()
•    - function shouldUpdateFunder(address f ...
•    - function getHowManyWithdrawalsForFund ...
•    - function setMinimumFundingAmount(uint ...
•    - function withdraw()
•    - function refund()
•    - function removeFunder()
•    - function consolidateFunder(address fu ...
•    - function addTokenization(string token ...
•    - function claimTokens()
•    - function enableTokenClaiming(bool _en ...
•    - function sunset()
•    - function swipe(address recipient)
•    - function tokenContractClaimTokens(add ...
•    - function tokenContractEnableTransfers ...

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/**
 *Submitted for verification at Etherscan.io on 2017-11-03
*/

pragma solidity 0.4.15;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract Controlled {
    /// @notice The address of the controller is the only address that can call
    ///  a function with this modifier
    modifier onlyController { require(msg.sender == controller); _; }

    address public controller;

    function Controlled() public { controller = msg.sender;}

    /// @notice Changes the controller of the contract
    /// @param _newController The new controller of the contract
    function changeController(address _newController) public onlyController {
        controller = _newController;
    }
}

/*
    Copyright 2016, Jordi Baylina

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/// @title MiniMeToken Contract
/// @author Jordi Baylina
/// @dev This token contract's goal is to make it easy for anyone to clone this
///  token using the token distribution at a given block, this will allow DAO's
///  and DApps to upgrade their features in a decentralized manner without
///  affecting the original token
/// @dev It is ERC20 compliant, but still needs to under go further testing.

contract ApproveAndCallFallBack {
    function receiveApproval(address from, uint256 _amount, address _token, bytes _data) public;
}

/// @dev The actual token contract, the default controller is the msg.sender
///  that deploys the contract, so usually this token will be deployed by a
///  token controller contract, which Giveth will call a "Campaign"
contract MiniMeToken is Controlled {

    string public name;                //The Token's name: e.g. DigixDAO Tokens
    uint8 public decimals;             //Number of decimals of the smallest unit
    string public symbol;              //An identifier: e.g. REP
    string public version = 'MMT_0.2'; //An arbitrary versioning scheme


    /// @dev `Checkpoint` is the structure that attaches a block number to a
    ///  given value, the block number attached is the one that last changed the
    ///  value
    struct  Checkpoint {

        // `fromBlock` is the block number that the value was generated from
        uint128 fromBlock;

        // `value` is the amount of tokens at a specific block number
        uint128 value;
    }

    // `parentToken` is the Token address that was cloned to produce this token;
    //  it will be 0x0 for a token that was not cloned
    MiniMeToken public parentToken;

    // `parentSnapShotBlock` is the block number from the Parent Token that was
    //  used to determine the initial distribution of the Clone Token
    uint public parentSnapShotBlock;

    // `creationBlock` is the block number that the Clone Token was created
    uint public creationBlock;

    // `balances` is the map that tracks the balance of each address, in this
    //  contract when the balance changes the block number that the change
    //  occurred is also included in the map
    mapping (address => Checkpoint[]) balances;

    // `allowed` tracks any extra transfer rights as in all ERC20 tokens
    mapping (address => mapping (address => uint256)) allowed;

    // Tracks the history of the `totalSupply` of the token
    Checkpoint[] totalSupplyHistory;

    // Flag that determines if the token is transferable or not.
    bool public transfersEnabled;

    // The factory used to create new clone tokens
    MiniMeTokenFactory public tokenFactory;

////////////////
// Constructor
////////////////

    /// @notice Constructor to create a MiniMeToken
    /// @param _tokenFactory The address of the MiniMeTokenFactory contract that
    ///  will create the Clone token contracts, the token factory needs to be
    ///  deployed first
    /// @param _parentToken Address of the parent token, set to 0x0 if it is a
    ///  new token
    /// @param _parentSnapShotBlock Block of the parent token that will
    ///  determine the initial distribution of the clone token, set to 0 if it
    ///  is a new token
    /// @param _tokenName Name of the new token
    /// @param _decimalUnits Number of decimals of the new token
    /// @param _tokenSymbol Token Symbol for the new token
    /// @param _transfersEnabled If true, tokens will be able to be transferred
    function MiniMeToken(
        address _tokenFactory,
        address _parentToken,
        uint _parentSnapShotBlock,
        string _tokenName,
        uint8 _decimalUnits,
        string _tokenSymbol,
        bool _transfersEnabled
    ) public {
        tokenFactory = MiniMeTokenFactory(_tokenFactory);
        name = _tokenName;                                 // Set the name
        decimals = _decimalUnits;                          // Set the decimals
        symbol = _tokenSymbol;                             // Set the symbol
        parentToken = MiniMeToken(_parentToken);
        parentSnapShotBlock = _parentSnapShotBlock;
        transfersEnabled = _transfersEnabled;
        creationBlock = block.number;
    }


///////////////////
// ERC20 Methods
///////////////////

    /// @notice Send `_amount` tokens to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint256 _amount) public returns (bool success) {
        require(transfersEnabled);
        return doTransfer(msg.sender, _to, _amount);
    }

    /// @notice Send `_amount` tokens to `_to` from `_from` on the condition it
    ///  is approved by `_from`
    /// @param _from The address holding the tokens being transferred
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be transferred
    /// @return True if the transfer was successful
    function transferFrom(address _from, address _to, uint256 _amount
    ) public returns (bool success) {

        // The controller of this contract can move tokens around at will,
        //  this is important to recognize! Confirm that you trust the
        //  controller of this contract, which in most situations should be
        //  another open source smart contract or 0x0
        if (msg.sender != controller) {
            require(transfersEnabled);

            // The standard ERC 20 transferFrom functionality
            if (allowed[_from][msg.sender] < _amount) return false;
            allowed[_from][msg.sender] -= _amount;
        }
        return doTransfer(_from, _to, _amount);
    }

    /// @dev This is the actual transfer function in the token contract, it can
    ///  only be called by other functions in this contract.
    /// @param _from The address holding the tokens being transferred
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be transferred
    /// @return True if the transfer was successful
    function doTransfer(address _from, address _to, uint _amount
    ) internal returns(bool) {

           if (_amount == 0) {
               return true;
           }

           require(parentSnapShotBlock < block.number);

           // Do not allow transfer to 0x0 or the token contract itself
           require((_to != 0) && (_to != address(this)));

           // If the amount being transfered is more than the balance of the
           //  account the transfer returns false
           var previousBalanceFrom = balanceOfAt(_from, block.number);
           if (previousBalanceFrom < _amount) {
               return false;
           }

           // First update the balance array with the new value for the address
           //  sending the tokens
           updateValueAtNow(balances[_from], previousBalanceFrom - _amount);

           // Then update the balance array with the new value for the address
           //  receiving the tokens
           var previousBalanceTo = balanceOfAt(_to, block.number);
           require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow
           updateValueAtNow(balances[_to], previousBalanceTo + _amount);

           // An event to make the transfer easy to find on the blockchain
           Transfer(_from, _to, _amount);

           return true;
    }

    /// @param _owner The address that's balance is being requested
    /// @return The balance of `_owner` at the current block
    function balanceOf(address _owner) public constant returns (uint256 balance) {
        return balanceOfAt(_owner, block.number);
    }

    /// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on
    ///  its behalf. This is a modified version of the ERC20 approve function
    ///  to be a little bit safer
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _amount The amount of tokens to be approved for transfer
    /// @return True if the approval was successful
    function approve(address _spender, uint256 _amount) public returns (bool success) {
        require(transfersEnabled);

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender,0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        require((_amount == 0) || (allowed[msg.sender][_spender] == 0));

        allowed[msg.sender][_spender] = _amount;
        Approval(msg.sender, _spender, _amount);
        return true;
    }

    /// @dev This function makes it easy to read the `allowed[]` map
    /// @param _owner The address of the account that owns the token
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens of _owner that _spender is allowed
    ///  to spend
    function allowance(address _owner, address _spender
    ) public constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }

    /// @notice `msg.sender` approves `_spender` to send `_amount` tokens on
    ///  its behalf, and then a function is triggered in the contract that is
    ///  being approved, `_spender`. This allows users to use their tokens to
    ///  interact with contracts in one function call instead of two
    /// @param _spender The address of the contract able to transfer the tokens
    /// @param _amount The amount of tokens to be approved for transfer
    /// @return True if the function call was successful
    function approveAndCall(address _spender, uint256 _amount, bytes _extraData
    ) public returns (bool success) {
        require(approve(_spender, _amount));

        ApproveAndCallFallBack(_spender).receiveApproval(
            msg.sender,
            _amount,
            this,
            _extraData
        );

        return true;
    }

    /// @dev This function makes it easy to get the total number of tokens
    /// @return The total number of tokens
    function totalSupply() public constant returns (uint) {
        return totalSupplyAt(block.number);
    }


////////////////
// Query balance and totalSupply in History
////////////////

    /// @dev Queries the balance of `_owner` at a specific `_blockNumber`
    /// @param _owner The address from which the balance will be retrieved
    /// @param _blockNumber The block number when the balance is queried
    /// @return The balance at `_blockNumber`
    function balanceOfAt(address _owner, uint _blockNumber) public constant
        returns (uint) {

        // These next few lines are used when the balance of the token is
        //  requested before a check point was ever created for this token, it
        //  requires that the `parentToken.balanceOfAt` be queried at the
        //  genesis block for that token as this contains initial balance of
        //  this token
        if ((balances[_owner].length == 0)
            || (balances[_owner][0].fromBlock > _blockNumber)) {
            if (address(parentToken) != 0) {
                return parentToken.balanceOfAt(_owner, min(_blockNumber, parentSnapShotBlock));
            } else {
                // Has no parent
                return 0;
            }

        // This will return the expected balance during normal situations
        } else {
            return getValueAt(balances[_owner], _blockNumber);
        }
    }

    /// @notice Total amount of tokens at a specific `_blockNumber`.
    /// @param _blockNumber The block number when the totalSupply is queried
    /// @return The total amount of tokens at `_blockNumber`
    function totalSupplyAt(uint _blockNumber) public constant returns(uint) {

        // These next few lines are used when the totalSupply of the token is
        //  requested before a check point was ever created for this token, it
        //  requires that the `parentToken.totalSupplyAt` be queried at the
        //  genesis block for this token as that contains totalSupply of this
        //  token at this block number.
        if ((totalSupplyHistory.length == 0)
            || (totalSupplyHistory[0].fromBlock > _blockNumber)) {
            if (address(parentToken) != 0) {
                return parentToken.totalSupplyAt(min(_blockNumber, parentSnapShotBlock));
            } else {
                return 0;
            }

        // This will return the expected totalSupply during normal situations
        } else {
            return getValueAt(totalSupplyHistory, _blockNumber);
        }
    }

////////////////
// Clone Token Method
////////////////

    /// @notice Creates a new clone token with the initial distribution being
    ///  this token at `_snapshotBlock`
    /// @param _cloneTokenName Name of the clone token
    /// @param _cloneDecimalUnits Number of decimals of the smallest unit
    /// @param _cloneTokenSymbol Symbol of the clone token
    /// @param _snapshotBlock Block when the distribution of the parent token is
    ///  copied to set the initial distribution of the new clone token;
    ///  if the block is zero than the actual block, the current block is used
    /// @param _transfersEnabled True if transfers are allowed in the clone
    /// @return The address of the new MiniMeToken Contract
    function createCloneToken(
        string _cloneTokenName,
        uint8 _cloneDecimalUnits,
        string _cloneTokenSymbol,
        uint _snapshotBlock,
        bool _transfersEnabled
        ) public returns(address) {
        if (_snapshotBlock == 0) _snapshotBlock = block.number;
        MiniMeToken cloneToken = tokenFactory.createCloneToken(
            this,
            _snapshotBlock,
            _cloneTokenName,
            _cloneDecimalUnits,
            _cloneTokenSymbol,
            _transfersEnabled
            );

        cloneToken.changeController(msg.sender);

        // An event to make the token easy to find on the blockchain
        NewCloneToken(address(cloneToken), _snapshotBlock);
        return address(cloneToken);
    }

////////////////
// Generate and destroy tokens
////////////////

    /// @notice Generates `_amount` tokens that are assigned to `_owner`
    /// @param _owner The address that will be assigned the new tokens
    /// @param _amount The quantity of tokens generated
    /// @return True if the tokens are generated correctly
    function generateTokens(address _owner, uint _amount
    ) public onlyController returns (bool) {
        uint curTotalSupply = totalSupply();
        require(curTotalSupply + _amount >= curTotalSupply); // Check for overflow
        uint previousBalanceTo = balanceOf(_owner);
        require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow
        updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount);
        updateValueAtNow(balances[_owner], previousBalanceTo + _amount);
        Transfer(0, _owner, _amount);
        return true;
    }


    /// @notice Burns `_amount` tokens from `_owner`
    /// @param _owner The address that will lose the tokens
    /// @param _amount The quantity of tokens to burn
    /// @return True if the tokens are burned correctly
    function destroyTokens(address _owner, uint _amount
    ) onlyController public returns (bool) {
        uint curTotalSupply = totalSupply();
        require(curTotalSupply >= _amount);
        uint previousBalanceFrom = balanceOf(_owner);
        require(previousBalanceFrom >= _amount);
        updateValueAtNow(totalSupplyHistory, curTotalSupply - _amount);
        updateValueAtNow(balances[_owner], previousBalanceFrom - _amount);
        Transfer(_owner, 0, _amount);
        return true;
    }

////////////////
// Enable tokens transfers
////////////////


    /// @notice Enables token holders to transfer their tokens freely if true
    /// @param _transfersEnabled True if transfers are allowed in the clone
    function enableTransfers(bool _transfersEnabled) public onlyController {
        transfersEnabled = _transfersEnabled;
    }

////////////////
// Internal helper functions to query and set a value in a snapshot array
////////////////

    /// @dev `getValueAt` retrieves the number of tokens at a given block number
    /// @param checkpoints The history of values being queried
    /// @param _block The block number to retrieve the value at
    /// @return The number of tokens being queried
    function getValueAt(Checkpoint[] storage checkpoints, uint _block
    ) constant internal returns (uint) {
        if (checkpoints.length == 0) return 0;

        // Shortcut for the actual value
        if (_block >= checkpoints[checkpoints.length-1].fromBlock)
            return checkpoints[checkpoints.length-1].value;
        if (_block < checkpoints[0].fromBlock) return 0;

        // Binary search of the value in the array
        uint min = 0;
        uint max = checkpoints.length-1;
        while (max > min) {
            uint mid = (max + min + 1)/ 2;
            if (checkpoints[mid].fromBlock<=_block) {
                min = mid;
            } else {
                max = mid-1;
            }
        }
        return checkpoints[min].value;
    }

    /// @dev `updateValueAtNow` used to update the `balances` map and the
    ///  `totalSupplyHistory`
    /// @param checkpoints The history of data being updated
    /// @param _value The new number of tokens
    function updateValueAtNow(Checkpoint[] storage checkpoints, uint _value
    ) internal  {
        if ((checkpoints.length == 0)
        || (checkpoints[checkpoints.length -1].fromBlock < block.number)) {
               Checkpoint storage newCheckPoint = checkpoints[ checkpoints.length++ ];
               newCheckPoint.fromBlock =  uint128(block.number);
               newCheckPoint.value = uint128(_value);
           } else {
               Checkpoint storage oldCheckPoint = checkpoints[checkpoints.length-1];
               oldCheckPoint.value = uint128(_value);
           }
    }

    /// @dev Internal function to determine if an address is a contract
    /// @param _addr The address being queried
    /// @return True if `_addr` is a contract
    function isContract(address _addr) constant internal returns(bool) {
        uint size;
        if (_addr == 0) return false;
        assembly {
            size := extcodesize(_addr)
        }
        return size>0;
    }

    /// @dev Helper function to return a min betwen the two uints
    /// PURE function
    function min(uint a, uint b) internal constant returns (uint) {
        return a < b ? a : b;
    }

    /// @notice The fallback function: If the contract's controller has not been
    ///  set to 0, then the `proxyPayment` method is called which relays the
    ///  ether and creates tokens as described in the token controller contract
    function () public payable {
    }

//////////
// Safety Methods
//////////

    /// @notice This method can be used by the controller to extract mistakenly
    ///  sent tokens to this contract.
    /// @param _token The address of the token contract that you want to recover
    ///  set to 0 in case you want to extract ether.
    function claimTokens(address _token) public onlyController {
        if (_token == 0x0) {
            controller.transfer(this.balance);
            return;
        }

        MiniMeToken token = MiniMeToken(_token);
        uint balance = token.balanceOf(this);
        token.transfer(controller, balance);
        ClaimedTokens(_token, controller, balance);
    }

////////////////
// Events
////////////////
    event ClaimedTokens(address indexed _token, address indexed _controller, uint _amount);
    event Transfer(address indexed _from, address indexed _to, uint256 _amount);
    event NewCloneToken(address indexed _cloneToken, uint _snapshotBlock);
    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _amount
        );

}


////////////////
// MiniMeTokenFactory
////////////////

/// @dev This contract is used to generate clone contracts from a contract.
///  In solidity this is the way to create a contract from a contract of the
///  same class
contract MiniMeTokenFactory {

    /// @notice Update the DApp by creating a new token with new functionalities
    ///  the msg.sender becomes the controller of this clone token
    /// @param _parentToken Address of the token being cloned
    /// @param _snapshotBlock Block of the parent token that will
    ///  determine the initial distribution of the clone token
    /// @param _tokenName Name of the new token
    /// @param _decimalUnits Number of decimals of the new token
    /// @param _tokenSymbol Token Symbol for the new token
    /// @param _transfersEnabled If true, tokens will be able to be transferred
    /// @return The address of the new token contract
    function createCloneToken(
        address _parentToken,
        uint _snapshotBlock,
        string _tokenName,
        uint8 _decimalUnits,
        string _tokenSymbol,
        bool _transfersEnabled
    ) public returns (MiniMeToken) {
        MiniMeToken newToken = new MiniMeToken(
            this,
            _parentToken,
            _snapshotBlock,
            _tokenName,
            _decimalUnits,
            _tokenSymbol,
            _transfersEnabled
            );

        newToken.changeController(msg.sender);
        return newToken;
    }
}

contract StakeTreeWithTokenization {
  using SafeMath for uint256;

  uint public version = 2;

  struct Funder {
    bool exists;
    uint balance;
    uint withdrawalEntry;
    uint contribution;
    uint contributionClaimed;
  }

  mapping(address => Funder) public funders;

  bool public live = true; // For sunsetting contract
  uint public totalCurrentFunders = 0; // Keeps track of total funders
  uint public withdrawalCounter = 0; // Keeps track of how many withdrawals have taken place
  uint public sunsetWithdrawDate;
  
  MiniMeToken public tokenContract;
  MiniMeTokenFactory public tokenFactory;
  bool public tokenized = false;
  bool public canClaimTokens = false;

  address public beneficiary; // Address for beneficiary
  uint public sunsetWithdrawalPeriod; // How long it takes for beneficiary to swipe contract when put into sunset mode
  uint public withdrawalPeriod; // How long the beneficiary has to wait withdraw
  uint public minimumFundingAmount; // Setting used for setting minimum amounts to fund contract with
  uint public lastWithdrawal; // Last withdrawal time
  uint public nextWithdrawal; // Next withdrawal time

  uint public contractStartTime; // For accounting purposes

  event Payment(address indexed funder, uint amount);
  event Refund(address indexed funder, uint amount);
  event Withdrawal(uint amount);
  event TokensClaimed(address indexed funder, uint amount);
  event Sunset(bool hasSunset);

  function StakeTreeWithTokenization(
    address beneficiaryAddress, 
    uint withdrawalPeriodInit, 
    uint withdrawalStart, 
    uint sunsetWithdrawPeriodInit,
    uint minimumFundingAmountInit) {

    beneficiary = beneficiaryAddress;
    withdrawalPeriod = withdrawalPeriodInit;
    sunsetWithdrawalPeriod = sunsetWithdrawPeriodInit;

    lastWithdrawal = withdrawalStart; 
    nextWithdrawal = lastWithdrawal + withdrawalPeriod;

    minimumFundingAmount = minimumFundingAmountInit;

    contractStartTime = now;
  }

  // Modifiers
  modifier onlyByBeneficiary() {
    require(msg.sender == beneficiary);
    _;
  }

  modifier onlyWhenTokenized() {
    require(isTokenized());
    _;
  }

  modifier onlyByFunder() {
    require(isFunder(msg.sender));
    _;
  }

  modifier onlyAfterNextWithdrawalDate() {
    require(now >= nextWithdrawal);
    _;
  }

  modifier onlyWhenLive() {
    require(live);
    _;
  }

  modifier onlyWhenSunset() {
    require(!live);
    _;
  }

  /*
  * External accounts can pay directly to contract to fund it.
  */
  function () payable {
    fund();
  }

  /*
  * Additional api for contracts to use as well
  * Can only happen when live and over a minimum amount set by the beneficiary
  */

  function fund() public payable onlyWhenLive {
    require(msg.value >= minimumFundingAmount);

    // Only increase total funders when we have a new funder
    if(!isFunder(msg.sender)) {
      totalCurrentFunders = totalCurrentFunders.add(1); // Increase total funder count

      funders[msg.sender] = Funder({
        exists: true,
        balance: msg.value,
        withdrawalEntry: withdrawalCounter, // Set the withdrawal counter. Ie at which withdrawal the funder "entered" the patronage contract
        contribution: 0,
        contributionClaimed: 0
      });
    }
    else { 
      consolidateFunder(msg.sender, msg.value);
    }

    Payment(msg.sender, msg.value);
  }

  // Pure functions

  /*
  * This function calculates how much the beneficiary can withdraw.
  * Due to no floating points in Solidity, we will lose some fidelity
  * if there's wei on the last digit. The beneficiary loses a neglibible amount
  * to withdraw but this benefits the beneficiary again on later withdrawals.
  * We multiply by 10 (which corresponds to the 10%) 
  * then divide by 100 to get the actual part.
  */
  function calculateWithdrawalAmount(uint startAmount) public returns (uint){
    return startAmount.mul(10).div(100); // 10%
  }

  /*
  * This function calculates the refund amount for the funder.
  * Due to no floating points in Solidity, we will lose some fidelity.
  * The funder loses a neglibible amount to refund. 
  * The left over wei gets pooled to the fund.
  */
  function calculateRefundAmount(uint amount, uint withdrawalTimes) public returns (uint) {    
    for(uint i=0; i<withdrawalTimes; i++){
      amount = amount.mul(9).div(10);
    }
    return amount;
  }

  // Getter functions

  /*
  * To calculate the refund amount we look at how many times the beneficiary
  * has withdrawn since the funder added their funds. 
  * We use that deduct 10% for each withdrawal.
  */

  function getRefundAmountForFunder(address addr) public constant returns (uint) {
    // Only calculate on-the-fly if funder has not been updated
    if(shouldUpdateFunder(addr)) {
      uint amount = funders[addr].balance;
      uint withdrawalTimes = getHowManyWithdrawalsForFunder(addr);
      return calculateRefundAmount(amount, withdrawalTimes);
    }
    else {
      return funders[addr].balance;
    }
  }

  function getFunderContribution(address funder) public constant returns (uint) {
    // Only calculate on-the-fly if funder has not been updated
    if(shouldUpdateFunder(funder)) {
      uint oldBalance = funders[funder].balance;
      uint newBalance = getRefundAmountForFunder(funder);
      uint contribution = oldBalance.sub(newBalance);
      return funders[funder].contribution.add(contribution);
    }
    else {
      return funders[funder].contribution;
    }
  }

  function getBeneficiary() public constant returns (address) {
    return beneficiary;
  }

  function getCurrentTotalFunders() public constant returns (uint) {
    return totalCurrentFunders;
  }

  function getWithdrawalCounter() public constant returns (uint) {
    return withdrawalCounter;
  }

  function getWithdrawalEntryForFunder(address addr) public constant returns (uint) {
    return funders[addr].withdrawalEntry;
  }

  function getContractBalance() public constant returns (uint256 balance) {
    balance = this.balance;
  }

  function getFunderBalance(address funder) public constant returns (uint256) {
    return getRefundAmountForFunder(funder);
  }

  function getFunderContributionClaimed(address addr) public constant returns (uint) {
    return funders[addr].contributionClaimed;
  }

  function isFunder(address addr) public constant returns (bool) {
    return funders[addr].exists;
  }

  function isTokenized() public constant returns (bool) {
    return tokenized;
  }

  function shouldUpdateFunder(address funder) public constant returns (bool) {
    return getWithdrawalEntryForFunder(funder) < withdrawalCounter;
  }

  function getHowManyWithdrawalsForFunder(address addr) private constant returns (uint) {
    return withdrawalCounter.sub(getWithdrawalEntryForFunder(addr));
  }

  // State changing functions
  function setMinimumFundingAmount(uint amount) external onlyByBeneficiary {
    require(amount > 0);
    minimumFundingAmount = amount;
  }

  function withdraw() external onlyByBeneficiary onlyAfterNextWithdrawalDate onlyWhenLive  {
    // Check
    uint amount = calculateWithdrawalAmount(this.balance);

    // Effects
    withdrawalCounter = withdrawalCounter.add(1);
    lastWithdrawal = now; // For tracking purposes
    nextWithdrawal = nextWithdrawal + withdrawalPeriod; // Fixed period increase

    // Interaction
    beneficiary.transfer(amount);

    Withdrawal(amount);
  }

  // Refunding by funder
  // Only funders can refund their own funding
  // Can only be sent back to the same address it was funded with
  // We also remove the funder if they succesfully exit with their funds
  function refund() external onlyByFunder {
    // Check
    uint walletBalance = this.balance;
    uint amount = getRefundAmountForFunder(msg.sender);
    require(amount > 0);

    // Effects
    removeFunder();

    // Interaction
    msg.sender.transfer(amount);

    Refund(msg.sender, amount);

    // Make sure this worked as intended
    assert(this.balance == walletBalance-amount);
  }

  // Used when the funder wants to remove themselves as a funder
  // without refunding. Their eth stays in the pool
  function removeFunder() public onlyByFunder {
    delete funders[msg.sender];
    totalCurrentFunders = totalCurrentFunders.sub(1);
  }

  /*
  * This is a bookkeeping function which updates the state for the funder
  * when top up their funds.
  */

  function consolidateFunder(address funder, uint newPayment) private {
    // Update contribution
    funders[funder].contribution = getFunderContribution(funder);
    // Update balance
    funders[funder].balance = getRefundAmountForFunder(funder).add(newPayment);
    // Update withdrawal entry
    funders[funder].withdrawalEntry = withdrawalCounter;
  }

  function addTokenization(string tokenName, string tokenSymbol, uint8 tokenDecimals ) external onlyByBeneficiary {
    require(!isTokenized());

    tokenFactory = new MiniMeTokenFactory();
    tokenContract = tokenFactory.createCloneToken(0x0, 0, tokenName, tokenDecimals, tokenSymbol, true);

    tokenized = true;
    canClaimTokens = true;
  }

  function claimTokens() external onlyByFunder onlyWhenTokenized {
    require(canClaimTokens);

    uint contributionAmount = getFunderContribution(msg.sender);
    uint contributionClaimedAmount = getFunderContributionClaimed(msg.sender);

    // Only claim tokens if they have some left to claim
    uint claimAmount = contributionAmount.sub(contributionClaimedAmount);
    require(claimAmount > 0);

    // Claim tokens
    funders[msg.sender].contributionClaimed = contributionAmount;
    tokenContract.generateTokens(msg.sender, claimAmount);

    TokensClaimed(msg.sender, claimAmount);
  }

  /*
  * The beneficiary can stop/enable funders from claiming more tokens.
  * This opens up opportunities for tokenizing only happening for a set periods.
  */
  function enableTokenClaiming(bool _enabled) external onlyWhenTokenized onlyByBeneficiary {
    canClaimTokens = _enabled;
  }

  /* --- Sunsetting --- */
  /*
  * The beneficiary can decide to stop using this contract.
  * They use this sunset function to put it into sunset mode.
  * The beneficiary can then swipe rest of the funds after a set time
  * if funders have not withdrawn their funds.
  */

  function sunset() external onlyByBeneficiary onlyWhenLive {
    sunsetWithdrawDate = now.add(sunsetWithdrawalPeriod);
    live = false;

    Sunset(true);
  }

  function swipe(address recipient) external onlyWhenSunset onlyByBeneficiary {
    require(now >= sunsetWithdrawDate);

    recipient.transfer(this.balance);
  }

  /* --- Token Contract Forwarding Controller Functions --- */
  /* 
  * Allows beneficiary to call two additional functions on the token contract:
  * claimTokens
  * enabledTransfers
  * 
  */
  function tokenContractClaimTokens(address _token) onlyByBeneficiary onlyWhenTokenized {
    tokenContract.claimTokens(_token);
  }
  function tokenContractEnableTransfers(bool _transfersEnabled) onlyByBeneficiary onlyWhenTokenized {
    tokenContract.enableTransfers(_transfersEnabled);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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