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pragma solidity ^0.6.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/ITap.sol";
import "./interfaces/IFundraisingController.sol";
import "./interfaces/IBatchedBancor.sol";



contract Tap is ITap, Ownable  {
    using SafeMath  for uint256;


    uint256 public constant PCT_BASE = 10 ** 18; // 0% = 0; 1% = 10 ** 16; 100% = 10 ** 18

    IFundraisingController       public controller;
    IBatchedBancor               public batchedBan;
    address                      public beneficiary;
    address                      public dao;
    uint256                      public batchBlocks;
    uint256                      public maximumTapRateIncreasePct;
    uint256                      public maximumTapFloorDecreasePct;

    mapping (address => uint256) public tappedAmounts;
    mapping (address => uint256) public rates;
    mapping (address => uint256) public floors;
    mapping (address => uint256) public lastTappedAmountUpdates; // batch ids [block numbers]
    mapping (address => uint256) public lastTapUpdates;  // timestamps

    event UpdateBeneficiary               (address indexed beneficiary);
    event UpdateMaximumTapRateIncreasePct (uint256 maximumTapRateIncreasePct);
    event UpdateMaximumTapFloorDecreasePct(uint256 maximumTapFloorDecreasePct);
    event AddTappedToken                  (address indexed token, uint256 rate, uint256 floor);
    event RemoveTappedToken               (address indexed token);
    event UpdateTappedToken               (address indexed token, uint256 rate, uint256 floor);
    event ResetTappedToken                (address indexed token);
    event UpdateTappedAmount              (address indexed token, uint256 tappedAmount);
    event Withdraw                        (address indexed token, uint256 amount);


    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyDAO() {
        require(dao == msg.sender, "DAO: caller is not the DAO");
        _;
    }

    /***** external functions *****/

    /**
     * @notice Initialize tap
     * @param _beneficiary                The address of the beneficiary [to whom funds are to be withdrawn]
     * @param _batchBlocks                The number of blocks batches are to last
     * @param _maximumTapRateIncreasePct  The maximum tap rate increase percentage allowed [in PCT_BASE]
     * @param _maximumTapFloorDecreasePct The maximum tap floor decrease percentage allowed [in PCT_BASE]
    */
    constructor (
        address _dao,
        address _beneficiary,
        uint256 _batchBlocks,
        uint256 _maximumTapRateIncreasePct,
        uint256 _maximumTapFloorDecreasePct
    )
        public
    {

        require(_beneficiaryIsValid(_beneficiary), "Invalid Beneficiary");
        require(_batchBlocks != 0, "Batch Block cannot equal zero");
        require(_maximumTapFloorDecreasePctIsValid(_maximumTapFloorDecreasePct), "Invalid Floor Decrease");

        beneficiary = _beneficiary;
        batchBlocks = _batchBlocks;
        maximumTapRateIncreasePct = _maximumTapRateIncreasePct;
        maximumTapFloorDecreasePct = _maximumTapFloorDecreasePct;
        dao = _dao;
    }

    function setUpTap(
      IFundraisingController _controller,
      IBatchedBancor _batchedBan
      ) public onlyOwner {
        controller = _controller;
        batchedBan = _batchedBan;
        transferOwnership(address(_controller));
      }

    /**
     * @notice Update beneficiary to `_beneficiary`
     * @param _beneficiary The address of the new beneficiary [to whom funds are to be withdrawn]
    */
    function updateBeneficiary(address _beneficiary) external onlyOwner override {
        require(_beneficiaryIsValid(_beneficiary), "Invalid Beneficiary");

        _updateBeneficiary(_beneficiary);
    }

    /**
     * @notice Update maximum tap rate increase percentage to `@formatPct(_maximumTapRateIncreasePct)`%
     * @param _maximumTapRateIncreasePct The new maximum tap rate increase percentage to be allowed [in PCT_BASE]
    */
    function updateMaximumTapRateIncreasePct(uint256 _maximumTapRateIncreasePct) external onlyOwner override {
        _updateMaximumTapRateIncreasePct(_maximumTapRateIncreasePct);
    }

    /**
     * @notice Update maximum tap floor decrease percentage to `@formatPct(_maximumTapFloorDecreasePct)`%
     * @param _maximumTapFloorDecreasePct The new maximum tap floor decrease percentage to be allowed [in PCT_BASE]
    */
    function updateMaximumTapFloorDecreasePct(uint256 _maximumTapFloorDecreasePct) external onlyOwner override {
        require(_maximumTapFloorDecreasePctIsValid(_maximumTapFloorDecreasePct), "Invalid floor decrease");

        _updateMaximumTapFloorDecreasePct(_maximumTapFloorDecreasePct);
    }

    /**
     * @notice Add tap for `_token.symbol(): string` with a rate of `@tokenAmount(_token, _rate)` per block and a floor of `@tokenAmount(_token, _floor)`
     * @param _token The address of the token to be tapped
     * @param _rate  The rate at which that token is to be tapped [in wei / block]
     * @param _floor The floor above which the reserve [pool] balance for that token is to be kept [in wei]
    */
    function addTappedToken(address _token, uint256 _rate, uint256 _floor) external onlyOwner override {
        require(!_tokenIsTapped(_token), "Token is already tapped");
        require(_tapRateIsValid(_rate), "Invalid tap rate");

        _addTappedToken(_token, _rate, _floor);
    }

    /**
     * @notice Remove tap for `_token.symbol(): string`
     * @param _token The address of the token to be un-tapped
    */
    function removeTappedToken(address _token) external onlyOwner {
        require(_tokenIsTapped(_token), "Token is not tapped");

        _removeTappedToken(_token);
    }

    /**
     * @notice Update tap for `_token.symbol(): string` with a rate of `@tokenAmount(_token, _rate)` per block and a floor of `@tokenAmount(_token, _floor)`
     * @param _token The address of the token whose tap is to be updated
     * @param _rate  The new rate at which that token is to be tapped [in wei / block]
     * @param _floor The new floor above which the reserve [pool] balance for that token is to be kept [in wei]
    */
    function updateTappedToken(address _token, uint256 _rate, uint256 _floor) external onlyOwner override {
        require(_tokenIsTapped(_token), "Token is not tapped");
        require(_tapRateIsValid(_rate), "Invalid tap rate");
        require(_tapUpdateIsValid(_token, _rate, _floor), "Invalid tap update");

        _updateTappedToken(_token, _rate, _floor);
    }

    /**
     * @notice Reset tap timestamps for `_token.symbol(): string`
     * @param _token The address of the token whose tap timestamps are to be reset
    */
    function resetTappedToken(address _token) external onlyOwner override {
        require(_tokenIsTapped(_token), "Token is not tapped");

        _resetTappedToken(_token);
    }

    /**
     * @notice Update tapped amount for `_token.symbol(): string`
     * @param _token The address of the token whose tapped amount is to be updated
    */
    function updateTappedAmount(address _token) external override {
        require(_tokenIsTapped(_token), "Token is not tapped");

        _updateTappedAmount(_token);
    }

    /**
     * @notice Transfer about `@tokenAmount(_token, self.getMaximalWithdrawal(_token): uint256)` from `self.reserve()` to `self.beneficiary()`
     * @param _token The address of the token to be transfered
    */
    function withdraw(address _token, uint _amount) external onlyDAO override {
        require(_tokenIsTapped(_token), "Token is not tapped");
        require(_amount > 0, "Withdraw amount is zero");

        _withdraw(_token, _amount);
    }

    /***** public view functions *****/

    function getMaximumWithdrawal(address _token) public view override returns (uint256) {
        return _tappedAmount(_token);
    }

    function getRates(address _token) public view override returns (uint256) {
        return rates[_token];
    }

    /***** internal functions *****/

    /* computation functions */

    function _currentBatchId() internal view returns (uint256) {
        return (block.number.div(batchBlocks)).mul(batchBlocks);
    }

    function _tappedAmount(address _token) internal view returns (uint256) {
        uint256 toBeKept = controller.collateralsToBeClaimed(_token).add(floors[_token]);
          IERC20 token = IERC20(_token);
        uint256 balance = token.balanceOf(address(batchedBan));
        uint256 flow = (_currentBatchId().sub(lastTappedAmountUpdates[_token])).mul(rates[_token]);
        uint256 tappedAmount = tappedAmounts[_token].add(flow);
        /**
         * whatever happens enough collateral should be
         * kept in the reserve pool to guarantee that
         * its balance is kept above the floor once
         * all pending sell orders are claimed
        */

        /**
         * the reserve's balance is already below the balance to be kept
         * the tapped amount should be reset to zero
        */
        if (balance <= toBeKept) {
            return 0;
        }

        /**
         * the reserve's balance minus the upcoming tap flow would be below the balance to be kept
         * the flow should be reduced to balance - toBeKept
        */
        if (balance <= toBeKept.add(tappedAmount)) {
            return balance.sub(toBeKept);
        }

        /**
         * the reserve's balance minus the upcoming flow is above the balance to be kept
         * the flow can be added to the tapped amount
        */
        return tappedAmount;
    }

    /* check functions */

    function _beneficiaryIsValid(address _beneficiary) internal pure returns (bool) {
        return _beneficiary != address(0);
    }

    function _maximumTapFloorDecreasePctIsValid(uint256 _maximumTapFloorDecreasePct) internal pure returns (bool) {
        return _maximumTapFloorDecreasePct <= PCT_BASE;
    }


    function _tokenIsTapped(address _token) internal view returns (bool) {
        return rates[_token] != uint256(0);
    }

    function _tapRateIsValid(uint256 _rate) internal pure returns (bool) {
        return _rate != 0;
    }

    function _tapUpdateIsValid(address _token, uint256 _rate, uint256 _floor) internal view returns (bool) {
        return _tapRateUpdateIsValid(_token, _rate) && _tapFloorUpdateIsValid(_token, _floor);
    }

    function _tapRateUpdateIsValid(address _token, uint256 _rate) internal view returns (bool) {
        uint256 rate = rates[_token];

        if (_rate <= rate) {
            return true;
        }

        if (now < lastTapUpdates[_token] + 30 days) {
            return false;
        }

        if (_rate.mul(PCT_BASE) <= rate.mul(PCT_BASE.add(maximumTapRateIncreasePct))) {
            return true;
        }

        return false;
    }

    function _tapFloorUpdateIsValid(address _token, uint256 _floor) internal view returns (bool) {
        uint256 floor = floors[_token];

        if (_floor >= floor) {
            return true;
        }

        if (now < lastTapUpdates[_token] + 30 days) {
            return false;
        }

        if (maximumTapFloorDecreasePct >= PCT_BASE) {
            return true;
        }

        if (_floor.mul(PCT_BASE) >= floor.mul(PCT_BASE.sub(maximumTapFloorDecreasePct))) {
            return true;
        }

        return false;
    }

    /* state modifying functions */

    function _updateTappedAmount(address _token) internal returns (uint256) {
        uint256 tappedAmount = _tappedAmount(_token);
        lastTappedAmountUpdates[_token] = _currentBatchId();
        tappedAmounts[_token] = tappedAmount;

        emit UpdateTappedAmount(_token, tappedAmount);

        return tappedAmount;
    }

    function _updateBeneficiary(address _beneficiary) internal {
        beneficiary = _beneficiary;

        emit UpdateBeneficiary(_beneficiary);
    }

    function _updateMaximumTapRateIncreasePct(uint256 _maximumTapRateIncreasePct) internal {
        maximumTapRateIncreasePct = _maximumTapRateIncreasePct;

        emit UpdateMaximumTapRateIncreasePct(_maximumTapRateIncreasePct);
    }

    function _updateMaximumTapFloorDecreasePct(uint256 _maximumTapFloorDecreasePct) internal {
        maximumTapFloorDecreasePct = _maximumTapFloorDecreasePct;

        emit UpdateMaximumTapFloorDecreasePct(_maximumTapFloorDecreasePct);
    }

    function _addTappedToken(address _token, uint256 _rate, uint256 _floor) internal {
        /**
         * NOTE
         * 1. if _token is tapped in the middle of a batch it will
         * reach the next batch faster than what it normally takes
         * to go through a batch [e.g. one block later]
         * 2. this will allow for a higher withdrawal than expected
         * a few blocks after _token is tapped
         * 3. this is not a problem because this extra amount is
         * static [at most rates[_token] * batchBlocks] and does
         * not increase in time
        */
        rates[_token] = _rate;
        floors[_token] = _floor;
        lastTappedAmountUpdates[_token] = _currentBatchId();
        lastTapUpdates[_token] = now;

        emit AddTappedToken(_token, _rate, _floor);
    }

    function _removeTappedToken(address _token) internal {
        delete tappedAmounts[_token];
        delete rates[_token];
        delete floors[_token];
        delete lastTappedAmountUpdates[_token];
        delete lastTapUpdates[_token];

        emit RemoveTappedToken(_token);
    }

    function _updateTappedToken(address _token, uint256 _rate, uint256 _floor) internal {
        /**
         * NOTE
         * withdraw before updating to keep the reserve
         * actual balance [balance - virtual withdrawal]
         * continuous in time [though a floor update can
         * still break this continuity]
        */
        uint256 amount = _updateTappedAmount(_token);
        if (amount > 0) {
            _withdraw(_token, amount);
        }

        rates[_token] = _rate;
        floors[_token] = _floor;
        lastTapUpdates[_token] = now;

        emit UpdateTappedToken(_token, _rate, _floor);
    }

    function _resetTappedToken(address _token) internal {
        tappedAmounts[_token] = 0;
        lastTappedAmountUpdates[_token] = _currentBatchId();
        lastTapUpdates[_token] = now;

        emit ResetTappedToken(_token);
    }

    function _withdraw(address _token, uint256 _amount) internal {
        IERC20 token = IERC20(_token);
        uint256 balance = token.balanceOf(address(batchedBan));
        require(balance > _amount);
        batchedBan.transfer(_token, _amount); // vault contract's transfer method already reverts on error

        emit Withdraw(_token, _amount);
    }
}

pragma solidity ^0.6.0;


abstract contract IBatchedBancor {
  function transfer(address _token, uint _amount) public virtual;
}

pragma solidity ^0.6.0;


abstract contract IFundraisingController {
    function openTrading() external virtual;
    function updateTappedAmount(address _token) external virtual;
    function collateralsToBeClaimed(address _collateral) public view virtual returns (uint256);
    function balanceOf(address _who, address _token) public view virtual returns (uint256);
}

pragma solidity ^0.6.0;


abstract contract ITap {
     function updateBeneficiary(address _beneficiary) external virtual;
     function updateMaximumTapRateIncreasePct(uint256 _maximumTapRateIncreasePct) external virtual;
     function updateMaximumTapFloorDecreasePct(uint256 _maximumTapFloorDecreasePct) external virtual;
     function addTappedToken(address _token, uint256 _rate, uint256 _floor) external virtual;
     function updateTappedToken(address _token, uint256 _rate, uint256 _floor) external virtual;
     function resetTappedToken(address _token) external virtual;
     function updateTappedAmount(address _token) external virtual;
     function withdraw(address _token, uint _amount) external virtual;
     function getMaximumWithdrawal(address _token) public view virtual returns (uint256);
     function getRates(address _token) public view virtual returns (uint256);
 }

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * 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(_owner == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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.
     */
    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.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        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.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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);
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 1
  },
  "evmVersion": "istanbul",
  "libraries": {
    "": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"address","name":"_dao","type":"address"},{"internalType":"address","name":"_beneficiary","type":"address"},{"internalType":"uint256","name":"_batchBlocks","type":"uint256"},{"internalType":"uint256","name":"_maximumTapRateIncreasePct","type":"uint256"},{"internalType":"uint256","name":"_maximumTapFloorDecreasePct","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"rate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"floor","type":"uint256"}],"name":"AddTappedToken","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"}],"name":"RemoveTappedToken","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"}],"name":"ResetTappedToken","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"}],"name":"UpdateBeneficiary","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"maximumTapFloorDecreasePct","type":"uint256"}],"name":"UpdateMaximumTapFloorDecreasePct","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"maximumTapRateIncreasePct","type":"uint256"}],"name":"UpdateMaximumTapRateIncreasePct","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"tappedAmount","type":"uint256"}],"name":"UpdateTappedAmount","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"rate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"floor","type":"uint256"}],"name":"UpdateTappedToken","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[],"name":"PCT_BASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_rate","type":"uint256"},{"internalType":"uint256","name":"_floor","type":"uint256"}],"name":"addTappedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"batchBlocks","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"batchedBan","outputs":[{"internalType":"contract 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IFundraisingController","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"dao","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"floors","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"getMaximumWithdrawal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"getRates","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastTapUpdates","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastTappedAmountUpdates","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maximumTapFloorDecreasePct","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maximumTapRateIncreasePct","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"rates","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"removeTappedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"resetTappedToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract 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000000000000000000000000e06748876bf92340d56c536388568cbcf679bc1100000000000000000000000077a9d21bef6a21a045503df0d8d58678392bafa5000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000006f05b59d3b2000000000000000000000000000000000000000000000000000006f05b59d3b20000

-----Decoded View---------------
Arg [0] : _dao (address): 0xe06748876bf92340D56C536388568cbcf679bc11
Arg [1] : _beneficiary (address): 0x77A9d21bEf6a21a045503df0d8D58678392BAFa5
Arg [2] : _batchBlocks (uint256): 1
Arg [3] : _maximumTapRateIncreasePct (uint256): 500000000000000000
Arg [4] : _maximumTapFloorDecreasePct (uint256): 500000000000000000

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000e06748876bf92340d56c536388568cbcf679bc11
Arg [1] : 00000000000000000000000077a9d21bef6a21a045503df0d8d58678392bafa5
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [3] : 00000000000000000000000000000000000000000000000006f05b59d3b20000
Arg [4] : 00000000000000000000000000000000000000000000000006f05b59d3b20000