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• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b)
• library SignedSafeMath
•    - function mul(int256 a, int256 b)
•    - function div(int256 a, int256 b)
•    - function sub(int256 a, int256 b)
•    - function add(int256 a, int256 b)
•    - function avg(int256 _a, int256 _b)
• library Median
•    - function calculate(int256[] memory li ...
•    - function calculateInplace(int256[] me ...
•    - function shortSelectTwo(
•    - function quickselect(int256[] memory ...
•    - function quickselectTwo(
•    - function partition(int256[] memory li ...
•    - function copy(int256[] memory list)
•  contract Owned
•    - function transferOwnership(address _t ...
•    - function acceptOwnership()
• library SafeMath128
•    - function add(uint128 a, uint128 b)
•    - function sub(uint128 a, uint128 b)
•    - function mul(uint128 a, uint128 b)
•    - function div(uint128 a, uint128 b)
•    - function mod(uint128 a, uint128 b)
• library SafeMath32
•    - function add(uint32 a, uint32 b)
•    - function sub(uint32 a, uint32 b)
•    - function mul(uint32 a, uint32 b)
•    - function div(uint32 a, uint32 b)
•    - function mod(uint32 a, uint32 b)
• library SafeMath64
•    - function add(uint64 a, uint64 b)
•    - function sub(uint64 a, uint64 b)
•    - function mul(uint64 a, uint64 b)
•    - function div(uint64 a, uint64 b)
•    - function mod(uint64 a, uint64 b)
• interface AggregatorInterface
•    - function latestAnswer()
•    - function latestTimestamp()
•    - function latestRound()
•    - function getAnswer(uint256 roundId)
•    - function getTimestamp(uint256 roundId ...
• interface AggregatorV3Interface
•    - function decimals()
•    - function description()
•    - function version()
•    - function getRoundData(uint80 _roundId ...
•    - function latestRoundData()
• interface AggregatorV2V3Interface is ...
• interface AggregatorValidatorInterfac ...
•    - function validate(
• interface LinkTokenInterface
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function balanceOf(address owner)
•    - function decimals()
•    - function decreaseApproval(address spe ...
•    - function increaseApproval(address spe ...
•    - function name()
•    - function symbol()
•    - function totalSupply()
•    - function transfer(address to, uint256 ...
•    - function transferAndCall(address to, ...
•    - function transferFrom(address from, a ...
•  contract FluxAggregator is Aggrega ...
•    - function submit(uint256 _roundId, int ...
•    - function changeOracles(
•    - function updateFutureRounds(
•    - function allocatedFunds()
•    - function availableFunds()
•    - function updateAvailableFunds()
•    - function oracleCount()
•    - function getOracles()
•    - function latestAnswer()
•    - function latestTimestamp()
•    - function latestRound()
•    - function getAnswer(uint256 _roundId)
•    - function getTimestamp(uint256 _roundI ...
•    - function getRoundData(uint80 _roundId ...
•    - function latestRoundData()
•    - function withdrawablePayment(address ...
•    - function withdrawPayment(address _ora ...
•    - function withdrawFunds(address _recip ...
•    - function getAdmin(address _oracle)
•    - function transferAdmin(address _oracl ...
•    - function acceptAdmin(address _oracle)
•    - function requestNewRound()
•    - function setRequesterPermissions(addr ...
•    - function onTokenTransfer(address, uin ...
•    - function oracleRoundState(address _or ...
•    - function setValidator(address _newVal ...
•    - function initializeNewRound(uint32 _r ...
•    - function oracleInitializeNewRound(uin ...
•    - function requesterInitializeNewRound( ...
•    - function updateTimedOutRoundInfo(uint ...
•    - function eligibleForSpecificRound(add ...
•    - function oracleRoundStateSuggestRound ...
•    - function updateRoundAnswer(uint32 _ro ...
•    - function validateAnswer(
•    - function payOracle(uint32 _roundId)
•    - function recordSubmission(int256 _sub ...
•    - function deleteRoundDetails(uint32 _r ...
•    - function timedOut(uint32 _roundId)
•    - function getStartingRound(address _or ...
•    - function previousAndCurrentUnanswered ...
•    - function requiredReserve(uint256 paym ...
•    - function addOracle(
•    - function removeOracle(
•    - function validateOracleRound(address ...
•    - function supersedable(uint32 _roundId ...
•    - function oracleEnabled(address _oracl ...
•    - function acceptingSubmissions(uint32 ...
•    - function delayed(address _oracle, uin ...
•    - function newRound(uint32 _roundId)
•    - function validRoundId(uint256 _roundI ...
• interface AccessControllerInterface
•    - function hasAccess(address user, byte ...
•  contract SimpleWriteAccessControll ...
•    - function hasAccess(
•    - function addAccess(address _user)
•    - function removeAccess(address _user)
•    - function enableAccessCheck()
•    - function disableAccessCheck()
•  contract SimpleReadAccessControlle ...
•    - function hasAccess(
•  contract AccessControlledAggregato ... *
•    - function getRoundData(uint80 _roundId ...
•    - function latestRoundData()
•    - function latestAnswer()
•    - function latestRound()
•    - function latestTimestamp()
•    - function getAnswer(uint256 _roundId)
•    - function getTimestamp(uint256 _roundI ...

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/**
 *Submitted for verification at Etherscan.io on 2020-08-06
*/

pragma solidity 0.6.6;


/**
 * @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) {
    require(b <= a, "SafeMath: subtraction overflow");
    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-solidity/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) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, "SafeMath: division by zero");
    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) {
    require(b != 0, "SafeMath: modulo by zero");
    return a % b;
  }
}

library SignedSafeMath {
  int256 constant private _INT256_MIN = -2**255;

  /**
   * @dev Multiplies two signed integers, reverts on overflow.
   */
  function mul(int256 a, int256 b) internal pure returns (int256) {
    // 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;
    }

    require(!(a == -1 && b == _INT256_MIN), "SignedSafeMath: multiplication overflow");

    int256 c = a * b;
    require(c / a == b, "SignedSafeMath: multiplication overflow");

    return c;
  }

  /**
   * @dev Integer division of two signed integers truncating the quotient, reverts on division by zero.
   */
  function div(int256 a, int256 b) internal pure returns (int256) {
    require(b != 0, "SignedSafeMath: division by zero");
    require(!(b == -1 && a == _INT256_MIN), "SignedSafeMath: division overflow");

    int256 c = a / b;

    return c;
  }

  /**
   * @dev Subtracts two signed integers, reverts on overflow.
   */
  function sub(int256 a, int256 b) internal pure returns (int256) {
    int256 c = a - b;
    require((b >= 0 && c <= a) || (b < 0 && c > a), "SignedSafeMath: subtraction overflow");

    return c;
  }

  /**
   * @dev Adds two signed integers, reverts on overflow.
   */
  function add(int256 a, int256 b) internal pure returns (int256) {
    int256 c = a + b;
    require((b >= 0 && c >= a) || (b < 0 && c < a), "SignedSafeMath: addition overflow");

    return c;
  }

  /**
   * @notice Computes average of two signed integers, ensuring that the computation
   * doesn't overflow.
   * @dev If the result is not an integer, it is rounded towards zero. For example,
   * avg(-3, -4) = -3
   */
  function avg(int256 _a, int256 _b)
    internal
    pure
    returns (int256)
  {
    if ((_a < 0 && _b > 0) || (_a > 0 && _b < 0)) {
      return add(_a, _b) / 2;
    }
    int256 remainder = (_a % 2 + _b % 2) / 2;
    return add(add(_a / 2, _b / 2), remainder);
  }
}

library Median {
  using SignedSafeMath for int256;

  int256 constant INT_MAX = 2**255-1;

  /**
   * @notice Returns the sorted middle, or the average of the two middle indexed items if the
   * array has an even number of elements.
   * @dev The list passed as an argument isn't modified.
   * @dev This algorithm has expected runtime O(n), but for adversarially chosen inputs
   * the runtime is O(n^2).
   * @param list The list of elements to compare
   */
  function calculate(int256[] memory list)
    internal
    pure
    returns (int256)
  {
    return calculateInplace(copy(list));
  }

  /**
   * @notice See documentation for function calculate.
   * @dev The list passed as an argument may be permuted.
   */
  function calculateInplace(int256[] memory list)
    internal
    pure
    returns (int256)
  {
    require(0 < list.length, "list must not be empty");
    uint256 len = list.length;
    uint256 middleIndex = len / 2;
    if (len % 2 == 0) {
      int256 median1;
      int256 median2;
      (median1, median2) = quickselectTwo(list, 0, len - 1, middleIndex - 1, middleIndex);
      return SignedSafeMath.avg(median1, median2);
    } else {
      return quickselect(list, 0, len - 1, middleIndex);
    }
  }

  /**
   * @notice Maximum length of list that shortSelectTwo can handle
   */
  uint256 constant SHORTSELECTTWO_MAX_LENGTH = 7;

  /**
   * @notice Select the k1-th and k2-th element from list of length at most 7
   * @dev Uses an optimal sorting network
   */
  function shortSelectTwo(
    int256[] memory list,
    uint256 lo,
    uint256 hi,
    uint256 k1,
    uint256 k2
  )
    private
    pure
    returns (int256 k1th, int256 k2th)
  {
    // Uses an optimal sorting network (https://en.wikipedia.org/wiki/Sorting_network)
    // for lists of length 7. Network layout is taken from
    // http://jgamble.ripco.net/cgi-bin/nw.cgi?inputs=7&algorithm=hibbard&output=svg

    uint256 len = hi + 1 - lo;
    int256 x0 = list[lo + 0];
    int256 x1 = 1 < len ? list[lo + 1] : INT_MAX;
    int256 x2 = 2 < len ? list[lo + 2] : INT_MAX;
    int256 x3 = 3 < len ? list[lo + 3] : INT_MAX;
    int256 x4 = 4 < len ? list[lo + 4] : INT_MAX;
    int256 x5 = 5 < len ? list[lo + 5] : INT_MAX;
    int256 x6 = 6 < len ? list[lo + 6] : INT_MAX;

    if (x0 > x1) {(x0, x1) = (x1, x0);}
    if (x2 > x3) {(x2, x3) = (x3, x2);}
    if (x4 > x5) {(x4, x5) = (x5, x4);}
    if (x0 > x2) {(x0, x2) = (x2, x0);}
    if (x1 > x3) {(x1, x3) = (x3, x1);}
    if (x4 > x6) {(x4, x6) = (x6, x4);}
    if (x1 > x2) {(x1, x2) = (x2, x1);}
    if (x5 > x6) {(x5, x6) = (x6, x5);}
    if (x0 > x4) {(x0, x4) = (x4, x0);}
    if (x1 > x5) {(x1, x5) = (x5, x1);}
    if (x2 > x6) {(x2, x6) = (x6, x2);}
    if (x1 > x4) {(x1, x4) = (x4, x1);}
    if (x3 > x6) {(x3, x6) = (x6, x3);}
    if (x2 > x4) {(x2, x4) = (x4, x2);}
    if (x3 > x5) {(x3, x5) = (x5, x3);}
    if (x3 > x4) {(x3, x4) = (x4, x3);}

    uint256 index1 = k1 - lo;
    if (index1 == 0) {k1th = x0;}
    else if (index1 == 1) {k1th = x1;}
    else if (index1 == 2) {k1th = x2;}
    else if (index1 == 3) {k1th = x3;}
    else if (index1 == 4) {k1th = x4;}
    else if (index1 == 5) {k1th = x5;}
    else if (index1 == 6) {k1th = x6;}
    else {revert("k1 out of bounds");}

    uint256 index2 = k2 - lo;
    if (k1 == k2) {return (k1th, k1th);}
    else if (index2 == 0) {return (k1th, x0);}
    else if (index2 == 1) {return (k1th, x1);}
    else if (index2 == 2) {return (k1th, x2);}
    else if (index2 == 3) {return (k1th, x3);}
    else if (index2 == 4) {return (k1th, x4);}
    else if (index2 == 5) {return (k1th, x5);}
    else if (index2 == 6) {return (k1th, x6);}
    else {revert("k2 out of bounds");}
  }

  /**
   * @notice Selects the k-th ranked element from list, looking only at indices between lo and hi
   * (inclusive). Modifies list in-place.
   */
  function quickselect(int256[] memory list, uint256 lo, uint256 hi, uint256 k)
    private
    pure
    returns (int256 kth)
  {
    require(lo <= k);
    require(k <= hi);
    while (lo < hi) {
      if (hi - lo < SHORTSELECTTWO_MAX_LENGTH) {
        int256 ignore;
        (kth, ignore) = shortSelectTwo(list, lo, hi, k, k);
        return kth;
      }
      uint256 pivotIndex = partition(list, lo, hi);
      if (k <= pivotIndex) {
        // since pivotIndex < (original hi passed to partition),
        // termination is guaranteed in this case
        hi = pivotIndex;
      } else {
        // since (original lo passed to partition) <= pivotIndex,
        // termination is guaranteed in this case
        lo = pivotIndex + 1;
      }
    }
    return list[lo];
  }

  /**
   * @notice Selects the k1-th and k2-th ranked elements from list, looking only at indices between
   * lo and hi (inclusive). Modifies list in-place.
   */
  function quickselectTwo(
    int256[] memory list,
    uint256 lo,
    uint256 hi,
    uint256 k1,
    uint256 k2
  )
    internal // for testing
    pure
    returns (int256 k1th, int256 k2th)
  {
    require(k1 < k2);
    require(lo <= k1 && k1 <= hi);
    require(lo <= k2 && k2 <= hi);

    while (true) {
      if (hi - lo < SHORTSELECTTWO_MAX_LENGTH) {
        return shortSelectTwo(list, lo, hi, k1, k2);
      }
      uint256 pivotIdx = partition(list, lo, hi);
      if (k2 <= pivotIdx) {
        hi = pivotIdx;
      } else if (pivotIdx < k1) {
        lo = pivotIdx + 1;
      } else {
        assert(k1 <= pivotIdx && pivotIdx < k2);
        k1th = quickselect(list, lo, pivotIdx, k1);
        k2th = quickselect(list, pivotIdx + 1, hi, k2);
        return (k1th, k2th);
      }
    }
  }

  /**
   * @notice Partitions list in-place using Hoare's partitioning scheme.
   * Only elements of list between indices lo and hi (inclusive) will be modified.
   * Returns an index i, such that:
   * - lo <= i < hi
   * - forall j in [lo, i]. list[j] <= list[i]
   * - forall j in [i, hi]. list[i] <= list[j]
   */
  function partition(int256[] memory list, uint256 lo, uint256 hi)
    private
    pure
    returns (uint256)
  {
    // We don't care about overflow of the addition, because it would require a list
    // larger than any feasible computer's memory.
    int256 pivot = list[(lo + hi) / 2];
    lo -= 1; // this can underflow. that's intentional.
    hi += 1;
    while (true) {
      do {
        lo += 1;
      } while (list[lo] < pivot);
      do {
        hi -= 1;
      } while (list[hi] > pivot);
      if (lo < hi) {
        (list[lo], list[hi]) = (list[hi], list[lo]);
      } else {
        // Let orig_lo and orig_hi be the original values of lo and hi passed to partition.
        // Then, hi < orig_hi, because hi decreases *strictly* monotonically
        // in each loop iteration and
        // - either list[orig_hi] > pivot, in which case the first loop iteration
        //   will achieve hi < orig_hi;
        // - or list[orig_hi] <= pivot, in which case at least two loop iterations are
        //   needed:
        //   - lo will have to stop at least once in the interval
        //     [orig_lo, (orig_lo + orig_hi)/2]
        //   - (orig_lo + orig_hi)/2 < orig_hi
        return hi;
      }
    }
  }

  /**
   * @notice Makes an in-memory copy of the array passed in
   * @param list Reference to the array to be copied
   */
  function copy(int256[] memory list)
    private
    pure
    returns(int256[] memory)
  {
    int256[] memory list2 = new int256[](list.length);
    for (uint256 i = 0; i < list.length; i++) {
      list2[i] = list[i];
    }
    return list2;
  }
}

/**
 * @title The Owned contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract Owned {

  address payable public owner;
  address private pendingOwner;

  event OwnershipTransferRequested(
    address indexed from,
    address indexed to
  );
  event OwnershipTransferred(
    address indexed from,
    address indexed to
  );

  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Allows an owner to begin transferring ownership to a new address,
   * pending.
   */
  function transferOwnership(address _to)
    external
    onlyOwner()
  {
    pendingOwner = _to;

    emit OwnershipTransferRequested(owner, _to);
  }

  /**
   * @dev Allows an ownership transfer to be completed by the recipient.
   */
  function acceptOwnership()
    external
  {
    require(msg.sender == pendingOwner, "Must be proposed owner");

    address oldOwner = owner;
    owner = msg.sender;
    pendingOwner = address(0);

    emit OwnershipTransferred(oldOwner, msg.sender);
  }

  /**
   * @dev Reverts if called by anyone other than the contract owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner, "Only callable by owner");
    _;
  }

}

/**
 * @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.
 *
 * This library is a version of Open Zeppelin's SafeMath, modified to support
 * unsigned 128 bit integers.
 */
library SafeMath128 {
  /**
    * @dev Returns the addition of two unsigned integers, reverting on
    * overflow.
    *
    * Counterpart to Solidity's `+` operator.
    *
    * Requirements:
    * - Addition cannot overflow.
    */
  function add(uint128 a, uint128 b) internal pure returns (uint128) {
    uint128 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(uint128 a, uint128 b) internal pure returns (uint128) {
    require(b <= a, "SafeMath: subtraction overflow");
    uint128 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(uint128 a, uint128 b) internal pure returns (uint128) {
    // 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-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint128 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(uint128 a, uint128 b) internal pure returns (uint128) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, "SafeMath: division by zero");
    uint128 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(uint128 a, uint128 b) internal pure returns (uint128) {
    require(b != 0, "SafeMath: modulo by zero");
    return a % b;
  }
}

/**
 * @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.
 *
 * This library is a version of Open Zeppelin's SafeMath, modified to support
 * unsigned 32 bit integers.
 */
library SafeMath32 {
  /**
    * @dev Returns the addition of two unsigned integers, reverting on
    * overflow.
    *
    * Counterpart to Solidity's `+` operator.
    *
    * Requirements:
    * - Addition cannot overflow.
    */
  function add(uint32 a, uint32 b) internal pure returns (uint32) {
    uint32 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(uint32 a, uint32 b) internal pure returns (uint32) {
    require(b <= a, "SafeMath: subtraction overflow");
    uint32 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(uint32 a, uint32 b) internal pure returns (uint32) {
    // 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-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint32 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(uint32 a, uint32 b) internal pure returns (uint32) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, "SafeMath: division by zero");
    uint32 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(uint32 a, uint32 b) internal pure returns (uint32) {
    require(b != 0, "SafeMath: modulo by zero");
    return a % b;
  }
}

/**
 * @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.
 *
 * This library is a version of Open Zeppelin's SafeMath, modified to support
 * unsigned 64 bit integers.
 */
library SafeMath64 {
  /**
    * @dev Returns the addition of two unsigned integers, reverting on
    * overflow.
    *
    * Counterpart to Solidity's `+` operator.
    *
    * Requirements:
    * - Addition cannot overflow.
    */
  function add(uint64 a, uint64 b) internal pure returns (uint64) {
    uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
    require(b <= a, "SafeMath: subtraction overflow");
    uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
    // 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-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, "SafeMath: division by zero");
    uint64 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(uint64 a, uint64 b) internal pure returns (uint64) {
    require(b != 0, "SafeMath: modulo by zero");
    return a % b;
  }
}

interface AggregatorInterface {
  function latestAnswer() external view returns (int256);
  function latestTimestamp() external view returns (uint256);
  function latestRound() external view returns (uint256);
  function getAnswer(uint256 roundId) external view returns (int256);
  function getTimestamp(uint256 roundId) external view returns (uint256);

  event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);
  event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}

interface AggregatorV3Interface {

  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}

interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface
{
}

interface AggregatorValidatorInterface {
  function validate(
    uint256 previousRoundId,
    int256 previousAnswer,
    uint256 currentRoundId,
    int256 currentAnswer
  ) external returns (bool);
}

interface LinkTokenInterface {
  function allowance(address owner, address spender) external view returns (uint256 remaining);
  function approve(address spender, uint256 value) external returns (bool success);
  function balanceOf(address owner) external view returns (uint256 balance);
  function decimals() external view returns (uint8 decimalPlaces);
  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);
  function increaseApproval(address spender, uint256 subtractedValue) external;
  function name() external view returns (string memory tokenName);
  function symbol() external view returns (string memory tokenSymbol);
  function totalSupply() external view returns (uint256 totalTokensIssued);
  function transfer(address to, uint256 value) external returns (bool success);
  function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool success);
  function transferFrom(address from, address to, uint256 value) external returns (bool success);
}

/**
 * @title The Prepaid Aggregator contract
 * @notice Handles aggregating data pushed in from off-chain, and unlocks
 * payment for oracles as they report. Oracles' submissions are gathered in
 * rounds, with each round aggregating the submissions for each oracle into a
 * single answer. The latest aggregated answer is exposed as well as historical
 * answers and their updated at timestamp.
 */
contract FluxAggregator is AggregatorV2V3Interface, Owned {
  using SafeMath for uint256;
  using SafeMath128 for uint128;
  using SafeMath64 for uint64;
  using SafeMath32 for uint32;

  struct Round {
    int256 answer;
    uint64 startedAt;
    uint64 updatedAt;
    uint32 answeredInRound;
  }

  struct RoundDetails {
    int256[] submissions;
    uint32 maxSubmissions;
    uint32 minSubmissions;
    uint32 timeout;
    uint128 paymentAmount;
  }

  struct OracleStatus {
    uint128 withdrawable;
    uint32 startingRound;
    uint32 endingRound;
    uint32 lastReportedRound;
    uint32 lastStartedRound;
    int256 latestSubmission;
    uint16 index;
    address admin;
    address pendingAdmin;
  }

  struct Requester {
    bool authorized;
    uint32 delay;
    uint32 lastStartedRound;
  }

  struct Funds {
    uint128 available;
    uint128 allocated;
  }

  LinkTokenInterface public linkToken;
  AggregatorValidatorInterface public validator;

  // Round related params
  uint128 public paymentAmount;
  uint32 public maxSubmissionCount;
  uint32 public minSubmissionCount;
  uint32 public restartDelay;
  uint32 public timeout;
  uint8 public override decimals;
  string public override description;

  int256 immutable public minSubmissionValue;
  int256 immutable public maxSubmissionValue;

  uint256 constant public override version = 3;

  /**
   * @notice To ensure owner isn't withdrawing required funds as oracles are
   * submitting updates, we enforce that the contract maintains a minimum
   * reserve of RESERVE_ROUNDS * oracleCount() LINK earmarked for payment to
   * oracles. (Of course, this doesn't prevent the contract from running out of
   * funds without the owner's intervention.)
   */
  uint256 constant private RESERVE_ROUNDS = 2;
  uint256 constant private MAX_ORACLE_COUNT = 77;
  uint32 constant private ROUND_MAX = 2**32-1;
  uint256 private constant VALIDATOR_GAS_LIMIT = 100000;
  // An error specific to the Aggregator V3 Interface, to prevent possible
  // confusion around accidentally reading unset values as reported values.
  string constant private V3_NO_DATA_ERROR = "No data present";

  uint32 private reportingRoundId;
  uint32 internal latestRoundId;
  mapping(address => OracleStatus) private oracles;
  mapping(uint32 => Round) internal rounds;
  mapping(uint32 => RoundDetails) internal details;
  mapping(address => Requester) internal requesters;
  address[] private oracleAddresses;
  Funds private recordedFunds;

  event AvailableFundsUpdated(
    uint256 indexed amount
  );
  event RoundDetailsUpdated(
    uint128 indexed paymentAmount,
    uint32 indexed minSubmissionCount,
    uint32 indexed maxSubmissionCount,
    uint32 restartDelay,
    uint32 timeout // measured in seconds
  );
  event OraclePermissionsUpdated(
    address indexed oracle,
    bool indexed whitelisted
  );
  event OracleAdminUpdated(
    address indexed oracle,
    address indexed newAdmin
  );
  event OracleAdminUpdateRequested(
    address indexed oracle,
    address admin,
    address newAdmin
  );
  event SubmissionReceived(
    int256 indexed submission,
    uint32 indexed round,
    address indexed oracle
  );
  event RequesterPermissionsSet(
    address indexed requester,
    bool authorized,
    uint32 delay
  );
  event ValidatorUpdated(
    address indexed previous,
    address indexed current
  );

  /**
   * @notice set up the aggregator with initial configuration
   * @param _link The address of the LINK token
   * @param _paymentAmount The amount paid of LINK paid to each oracle per submission, in wei (units of 10⁻¹⁸ LINK)
   * @param _timeout is the number of seconds after the previous round that are
   * allowed to lapse before allowing an oracle to skip an unfinished round
   * @param _validator is an optional contract address for validating
   * external validation of answers
   * @param _minSubmissionValue is an immutable check for a lower bound of what
   * submission values are accepted from an oracle
   * @param _maxSubmissionValue is an immutable check for an upper bound of what
   * submission values are accepted from an oracle
   * @param _decimals represents the number of decimals to offset the answer by
   * @param _description a short description of what is being reported
   */
  constructor(
    address _link,
    uint128 _paymentAmount,
    uint32 _timeout,
    address _validator,
    int256 _minSubmissionValue,
    int256 _maxSubmissionValue,
    uint8 _decimals,
    string memory _description
  ) public {
    linkToken = LinkTokenInterface(_link);
    updateFutureRounds(_paymentAmount, 0, 0, 0, _timeout);
    setValidator(_validator);
    minSubmissionValue = _minSubmissionValue;
    maxSubmissionValue = _maxSubmissionValue;
    decimals = _decimals;
    description = _description;
    rounds[0].updatedAt = uint64(block.timestamp.sub(uint256(_timeout)));
  }

  /**
   * @notice called by oracles when they have witnessed a need to update
   * @param _roundId is the ID of the round this submission pertains to
   * @param _submission is the updated data that the oracle is submitting
   */
  function submit(uint256 _roundId, int256 _submission)
    external
  {
    bytes memory error = validateOracleRound(msg.sender, uint32(_roundId));
    require(_submission >= minSubmissionValue, "value below minSubmissionValue");
    require(_submission <= maxSubmissionValue, "value above maxSubmissionValue");
    require(error.length == 0, string(error));

    oracleInitializeNewRound(uint32(_roundId));
    recordSubmission(_submission, uint32(_roundId));
    (bool updated, int256 newAnswer) = updateRoundAnswer(uint32(_roundId));
    payOracle(uint32(_roundId));
    deleteRoundDetails(uint32(_roundId));
    if (updated) {
      validateAnswer(uint32(_roundId), newAnswer);
    }
  }

  /**
   * @notice called by the owner to remove and add new oracles as well as
   * update the round related parameters that pertain to total oracle count
   * @param _removed is the list of addresses for the new Oracles being removed
   * @param _added is the list of addresses for the new Oracles being added
   * @param _addedAdmins is the admin addresses for the new respective _added
   * list. Only this address is allowed to access the respective oracle's funds
   * @param _minSubmissions is the new minimum submission count for each round
   * @param _maxSubmissions is the new maximum submission count for each round
   * @param _restartDelay is the number of rounds an Oracle has to wait before
   * they can initiate a round
   */
  function changeOracles(
    address[] calldata _removed,
    address[] calldata _added,
    address[] calldata _addedAdmins,
    uint32 _minSubmissions,
    uint32 _maxSubmissions,
    uint32 _restartDelay
  )
    external
    onlyOwner()
  {
    for (uint256 i = 0; i < _removed.length; i++) {
      removeOracle(_removed[i]);
    }

    require(_added.length == _addedAdmins.length, "need same oracle and admin count");
    require(uint256(oracleCount()).add(_added.length) <= MAX_ORACLE_COUNT, "max oracles allowed");

    for (uint256 i = 0; i < _added.length; i++) {
      addOracle(_added[i], _addedAdmins[i]);
    }

    updateFutureRounds(paymentAmount, _minSubmissions, _maxSubmissions, _restartDelay, timeout);
  }

  /**
   * @notice update the round and payment related parameters for subsequent
   * rounds
   * @param _paymentAmount is the payment amount for subsequent rounds
   * @param _minSubmissions is the new minimum submission count for each round
   * @param _maxSubmissions is the new maximum submission count for each round
   * @param _restartDelay is the number of rounds an Oracle has to wait before
   * they can initiate a round
   */
  function updateFutureRounds(
    uint128 _paymentAmount,
    uint32 _minSubmissions,
    uint32 _maxSubmissions,
    uint32 _restartDelay,
    uint32 _timeout
  )
    public
    onlyOwner()
  {
    uint32 oracleNum = oracleCount(); // Save on storage reads
    require(_maxSubmissions >= _minSubmissions, "max must equal/exceed min");
    require(oracleNum >= _maxSubmissions, "max cannot exceed total");
    require(oracleNum == 0 || oracleNum > _restartDelay, "delay cannot exceed total");
    require(recordedFunds.available >= requiredReserve(_paymentAmount), "insufficient funds for payment");
    if (oracleCount() > 0) {
      require(_minSubmissions > 0, "min must be greater than 0");
    }

    paymentAmount = _paymentAmount;
    minSubmissionCount = _minSubmissions;
    maxSubmissionCount = _maxSubmissions;
    restartDelay = _restartDelay;
    timeout = _timeout;

    emit RoundDetailsUpdated(
      paymentAmount,
      _minSubmissions,
      _maxSubmissions,
      _restartDelay,
      _timeout
    );
  }

  /**
   * @notice the amount of payment yet to be withdrawn by oracles
   */
  function allocatedFunds()
    external
    view
    returns (uint128)
  {
    return recordedFunds.allocated;
  }

  /**
   * @notice the amount of future funding available to oracles
   */
  function availableFunds()
    external
    view
    returns (uint128)
  {
    return recordedFunds.available;
  }

  /**
   * @notice recalculate the amount of LINK available for payouts
   */
  function updateAvailableFunds()
    public
  {
    Funds memory funds = recordedFunds;

    uint256 nowAvailable = linkToken.balanceOf(address(this)).sub(funds.allocated);

    if (funds.available != nowAvailable) {
      recordedFunds.available = uint128(nowAvailable);
      emit AvailableFundsUpdated(nowAvailable);
    }
  }

  /**
   * @notice returns the number of oracles
   */
  function oracleCount() public view returns (uint8) {
    return uint8(oracleAddresses.length);
  }

  /**
   * @notice returns an array of addresses containing the oracles on contract
   */
  function getOracles() external view returns (address[] memory) {
    return oracleAddresses;
  }

  /**
   * @notice get the most recently reported answer
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestAnswer()
    public
    view
    virtual
    override
    returns (int256)
  {
    return rounds[latestRoundId].answer;
  }

  /**
   * @notice get the most recent updated at timestamp
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestTimestamp()
    public
    view
    virtual
    override
    returns (uint256)
  {
    return rounds[latestRoundId].updatedAt;
  }

  /**
   * @notice get the ID of the last updated round
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestRound()
    public
    view
    virtual
    override
    returns (uint256)
  {
    return latestRoundId;
  }

  /**
   * @notice get past rounds answers
   * @param _roundId the round number to retrieve the answer for
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getAnswer(uint256 _roundId)
    public
    view
    virtual
    override
    returns (int256)
  {
    if (validRoundId(_roundId)) {
      return rounds[uint32(_roundId)].answer;
    }
    return 0;
  }

  /**
   * @notice get timestamp when an answer was last updated
   * @param _roundId the round number to retrieve the updated timestamp for
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getTimestamp(uint256 _roundId)
    public
    view
    virtual
    override
    returns (uint256)
  {
    if (validRoundId(_roundId)) {
      return rounds[uint32(_roundId)].updatedAt;
    }
    return 0;
  }

  /**
   * @notice get data about a round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values.
   * @param _roundId the round ID to retrieve the round data for
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started. This is 0
   * if the round hasn't been started yet.
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed. answeredInRound may be smaller than roundId when the round
   * timed out. answeredInRound is equal to roundId when the round didn't time out
   * and was completed regularly.
   * @dev Note that for in-progress rounds (i.e. rounds that haven't yet received
   * maxSubmissions) answer and updatedAt may change between queries.
   */
  function getRoundData(uint80 _roundId)
    public
    view
    virtual
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    Round memory r = rounds[uint32(_roundId)];

    require(r.answeredInRound > 0 && validRoundId(_roundId), V3_NO_DATA_ERROR);

    return (
      _roundId,
      r.answer,
      r.startedAt,
      r.updatedAt,
      r.answeredInRound
    );
  }

  /**
   * @notice get data about the latest round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values. Consumers are encouraged to
   * use this more fully featured method over the "legacy" latestRound/
   * latestAnswer/latestTimestamp functions. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values.
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started. This is 0
   * if the round hasn't been started yet.
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed. answeredInRound may be smaller than roundId when the round
   * timed out. answeredInRound is equal to roundId when the round didn't time
   * out and was completed regularly.
   * @dev Note that for in-progress rounds (i.e. rounds that haven't yet
   * received maxSubmissions) answer and updatedAt may change between queries.
   */
   function latestRoundData()
    public
    view
    virtual
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return getRoundData(latestRoundId);
  }


  /**
   * @notice query the available amount of LINK for an oracle to withdraw
   */
  function withdrawablePayment(address _oracle)
    external
    view
    returns (uint256)
  {
    return oracles[_oracle].withdrawable;
  }

  /**
   * @notice transfers the oracle's LINK to another address. Can only be called
   * by the oracle's admin.
   * @param _oracle is the oracle whose LINK is transferred
   * @param _recipient is the address to send the LINK to
   * @param _amount is the amount of LINK to send
   */
  function withdrawPayment(address _oracle, address _recipient, uint256 _amount)
    external
  {
    require(oracles[_oracle].admin == msg.sender, "only callable by admin");

    // Safe to downcast _amount because the total amount of LINK is less than 2^128.
    uint128 amount = uint128(_amount);
    uint128 available = oracles[_oracle].withdrawable;
    require(available >= amount, "insufficient withdrawable funds");

    oracles[_oracle].withdrawable = available.sub(amount);
    recordedFunds.allocated = recordedFunds.allocated.sub(amount);

    assert(linkToken.transfer(_recipient, uint256(amount)));
  }

  /**
   * @notice transfers the owner's LINK to another address
   * @param _recipient is the address to send the LINK to
   * @param _amount is the amount of LINK to send
   */
  function withdrawFunds(address _recipient, uint256 _amount)
    external
    onlyOwner()
  {
    uint256 available = uint256(recordedFunds.available);
    require(available.sub(requiredReserve(paymentAmount)) >= _amount, "insufficient reserve funds");
    require(linkToken.transfer(_recipient, _amount), "token transfer failed");
    updateAvailableFunds();
  }

  /**
   * @notice get the admin address of an oracle
   * @param _oracle is the address of the oracle whose admin is being queried
   */
  function getAdmin(address _oracle)
    external
    view
    returns (address)
  {
    return oracles[_oracle].admin;
  }

  /**
   * @notice transfer the admin address for an oracle
   * @param _oracle is the address of the oracle whose admin is being transferred
   * @param _newAdmin is the new admin address
   */
  function transferAdmin(address _oracle, address _newAdmin)
    external
  {
    require(oracles[_oracle].admin == msg.sender, "only callable by admin");
    oracles[_oracle].pendingAdmin = _newAdmin;

    emit OracleAdminUpdateRequested(_oracle, msg.sender, _newAdmin);
  }

  /**
   * @notice accept the admin address transfer for an oracle
   * @param _oracle is the address of the oracle whose admin is being transferred
   */
  function acceptAdmin(address _oracle)
    external
  {
    require(oracles[_oracle].pendingAdmin == msg.sender, "only callable by pending admin");
    oracles[_oracle].pendingAdmin = address(0);
    oracles[_oracle].admin = msg.sender;

    emit OracleAdminUpdated(_oracle, msg.sender);
  }

  /**
   * @notice allows non-oracles to request a new round
   */
  function requestNewRound()
    external
    returns (uint80)
  {
    require(requesters[msg.sender].authorized, "not authorized requester");

    uint32 current = reportingRoundId;
    require(rounds[current].updatedAt > 0 || timedOut(current), "prev round must be supersedable");

    uint32 newRoundId = current.add(1);
    requesterInitializeNewRound(newRoundId);
    return newRoundId;
  }

  /**
   * @notice allows the owner to specify new non-oracles to start new rounds
   * @param _requester is the address to set permissions for
   * @param _authorized is a boolean specifying whether they can start new rounds or not
   * @param _delay is the number of rounds the requester must wait before starting another round
   */
  function setRequesterPermissions(address _requester, bool _authorized, uint32 _delay)
    external
    onlyOwner()
  {
    if (requesters[_requester].authorized == _authorized) return;

    if (_authorized) {
      requesters[_requester].authorized = _authorized;
      requesters[_requester].delay = _delay;
    } else {
      delete requesters[_requester];
    }

    emit RequesterPermissionsSet(_requester, _authorized, _delay);
  }

  /**
   * @notice called through LINK's transferAndCall to update available funds
   * in the same transaction as the funds were transferred to the aggregator
   * @param _data is mostly ignored. It is checked for length, to be sure
   * nothing strange is passed in.
   */
  function onTokenTransfer(address, uint256, bytes calldata _data)
    external
  {
    require(_data.length == 0, "transfer doesn't accept calldata");
    updateAvailableFunds();
  }

  /**
   * @notice a method to provide all current info oracles need. Intended only
   * only to be callable by oracles. Not for use by contracts to read state.
   * @param _oracle the address to look up information for.
   */
  function oracleRoundState(address _oracle, uint32 _queriedRoundId)
    external
    view
    returns (
      bool _eligibleToSubmit,
      uint32 _roundId,
      int256 _latestSubmission,
      uint64 _startedAt,
      uint64 _timeout,
      uint128 _availableFunds,
      uint8 _oracleCount,
      uint128 _paymentAmount
    )
  {
    require(msg.sender == tx.origin, "off-chain reading only");

    if (_queriedRoundId > 0) {
      Round storage round = rounds[_queriedRoundId];
      RoundDetails storage details = details[_queriedRoundId];
      return (
        eligibleForSpecificRound(_oracle, _queriedRoundId),
        _queriedRoundId,
        oracles[_oracle].latestSubmission,
        round.startedAt,
        details.timeout,
        recordedFunds.available,
        oracleCount(),
        (round.startedAt > 0 ? details.paymentAmount : paymentAmount)
      );
    } else {
      return oracleRoundStateSuggestRound(_oracle);
    }
  }

  /**
   * @notice method to update the address which does external data validation.
   * @param _newValidator designates the address of the new validation contract.
   */
  function setValidator(address _newValidator)
    public
    onlyOwner()
  {
    address previous = address(validator);

    if (previous != _newValidator) {
      validator = AggregatorValidatorInterface(_newValidator);

      emit ValidatorUpdated(previous, _newValidator);
    }
  }


  /**
   * Private
   */

  function initializeNewRound(uint32 _roundId)
    private
  {
    updateTimedOutRoundInfo(_roundId.sub(1));

    reportingRoundId = _roundId;
    RoundDetails memory nextDetails = RoundDetails(
      new int256[](0),
      maxSubmissionCount,
      minSubmissionCount,
      timeout,
      paymentAmount
    );
    details[_roundId] = nextDetails;
    rounds[_roundId].startedAt = uint64(block.timestamp);

    emit NewRound(_roundId, msg.sender, rounds[_roundId].startedAt);
  }

  function oracleInitializeNewRound(uint32 _roundId)
    private
  {
    if (!newRound(_roundId)) return;
    uint256 lastStarted = oracles[msg.sender].lastStartedRound; // cache storage reads
    if (_roundId <= lastStarted + restartDelay && lastStarted != 0) return;

    initializeNewRound(_roundId);

    oracles[msg.sender].lastStartedRound = _roundId;
  }

  function requesterInitializeNewRound(uint32 _roundId)
    private
  {
    if (!newRound(_roundId)) return;
    uint256 lastStarted = requesters[msg.sender].lastStartedRound; // cache storage reads
    require(_roundId > lastStarted + requesters[msg.sender].delay || lastStarted == 0, "must delay requests");

    initializeNewRound(_roundId);

    requesters[msg.sender].lastStartedRound = _roundId;
  }

  function updateTimedOutRoundInfo(uint32 _roundId)
    private
  {
    if (!timedOut(_roundId)) return;

    uint32 prevId = _roundId.sub(1);
    rounds[_roundId].answer = rounds[prevId].answer;
    rounds[_roundId].answeredInRound = rounds[prevId].answeredInRound;
    rounds[_roundId].updatedAt = uint64(block.timestamp);

    delete details[_roundId];
  }

  function eligibleForSpecificRound(address _oracle, uint32 _queriedRoundId)
    private
    view
    returns (bool _eligible)
  {
    if (rounds[_queriedRoundId].startedAt > 0) {
      return acceptingSubmissions(_queriedRoundId) && validateOracleRound(_oracle, _queriedRoundId).length == 0;
    } else {
      return delayed(_oracle, _queriedRoundId) && validateOracleRound(_oracle, _queriedRoundId).length == 0;
    }
  }

  function oracleRoundStateSuggestRound(address _oracle)
    private
    view
    returns (
      bool _eligibleToSubmit,
      uint32 _roundId,
      int256 _latestSubmission,
      uint64 _startedAt,
      uint64 _timeout,
      uint128 _availableFunds,
      uint8 _oracleCount,
      uint128 _paymentAmount
    )
  {
    Round storage round = rounds[0];
    OracleStatus storage oracle = oracles[_oracle];

    bool shouldSupersede = oracle.lastReportedRound == reportingRoundId || !acceptingSubmissions(reportingRoundId);
    // Instead of nudging oracles to submit to the next round, the inclusion of
    // the shouldSupersede bool in the if condition pushes them towards
    // submitting in a currently open round.
    if (supersedable(reportingRoundId) && shouldSupersede) {
      _roundId = reportingRoundId.add(1);
      round = rounds[_roundId];

      _paymentAmount = paymentAmount;
      _eligibleToSubmit = delayed(_oracle, _roundId);
    } else {
      _roundId = reportingRoundId;
      round = rounds[_roundId];

      _paymentAmount = details[_roundId].paymentAmount;
      _eligibleToSubmit = acceptingSubmissions(_roundId);
    }

    if (validateOracleRound(_oracle, _roundId).length != 0) {
      _eligibleToSubmit = false;
    }

    return (
      _eligibleToSubmit,
      _roundId,
      oracle.latestSubmission,
      round.startedAt,
      details[_roundId].timeout,
      recordedFunds.available,
      oracleCount(),
      _paymentAmount
    );
  }

  function updateRoundAnswer(uint32 _roundId)
    internal
    returns (bool, int256)
  {
    if (details[_roundId].submissions.length < details[_roundId].minSubmissions) {
      return (false, 0);
    }

    int256 newAnswer = Median.calculateInplace(details[_roundId].submissions);
    rounds[_roundId].answer = newAnswer;
    rounds[_roundId].updatedAt = uint64(block.timestamp);
    rounds[_roundId].answeredInRound = _roundId;
    latestRoundId = _roundId;

    emit AnswerUpdated(newAnswer, _roundId, now);

    return (true, newAnswer);
  }

  function validateAnswer(
    uint32 _roundId,
    int256 _newAnswer
  )
    private
  {
    AggregatorValidatorInterface av = validator; // cache storage reads
    if (address(av) == address(0)) return;

    uint32 prevRound = _roundId.sub(1);
    uint32 prevAnswerRoundId = rounds[prevRound].answeredInRound;
    int256 prevRoundAnswer = rounds[prevRound].answer;
    // We do not want the validator to ever prevent reporting, so we limit its
    // gas usage and catch any errors that may arise.
    try av.validate{gas: VALIDATOR_GAS_LIMIT}(
      prevAnswerRoundId,
      prevRoundAnswer,
      _roundId,
      _newAnswer
    ) {} catch {}
  }

  function payOracle(uint32 _roundId)
    private
  {
    uint128 payment = details[_roundId].paymentAmount;
    Funds memory funds = recordedFunds;
    funds.available = funds.available.sub(payment);
    funds.allocated = funds.allocated.add(payment);
    recordedFunds = funds;
    oracles[msg.sender].withdrawable = oracles[msg.sender].withdrawable.add(payment);

    emit AvailableFundsUpdated(funds.available);
  }

  function recordSubmission(int256 _submission, uint32 _roundId)
    private
  {
    require(acceptingSubmissions(_roundId), "round not accepting submissions");

    details[_roundId].submissions.push(_submission);
    oracles[msg.sender].lastReportedRound = _roundId;
    oracles[msg.sender].latestSubmission = _submission;

    emit SubmissionReceived(_submission, _roundId, msg.sender);
  }

  function deleteRoundDetails(uint32 _roundId)
    private
  {
    if (details[_roundId].submissions.length < details[_roundId].maxSubmissions) return;

    delete details[_roundId];
  }

  function timedOut(uint32 _roundId)
    private
    view
    returns (bool)
  {
    uint64 startedAt = rounds[_roundId].startedAt;
    uint32 roundTimeout = details[_roundId].timeout;
    return startedAt > 0 && roundTimeout > 0 && startedAt.add(roundTimeout) < block.timestamp;
  }

  function getStartingRound(address _oracle)
    private
    view
    returns (uint32)
  {
    uint32 currentRound = reportingRoundId;
    if (currentRound != 0 && currentRound == oracles[_oracle].endingRound) {
      return currentRound;
    }
    return currentRound.add(1);
  }

  function previousAndCurrentUnanswered(uint32 _roundId, uint32 _rrId)
    private
    view
    returns (bool)
  {
    return _roundId.add(1) == _rrId && rounds[_rrId].updatedAt == 0;
  }

  function requiredReserve(uint256 payment)
    private
    view
    returns (uint256)
  {
    return payment.mul(oracleCount()).mul(RESERVE_ROUNDS);
  }

  function addOracle(
    address _oracle,
    address _admin
  )
    private
  {
    require(!oracleEnabled(_oracle), "oracle already enabled");

    require(_admin != address(0), "cannot set admin to 0");
    require(oracles[_oracle].admin == address(0) || oracles[_oracle].admin == _admin, "owner cannot overwrite admin");

    oracles[_oracle].startingRound = getStartingRound(_oracle);
    oracles[_oracle].endingRound = ROUND_MAX;
    oracles[_oracle].index = uint16(oracleAddresses.length);
    oracleAddresses.push(_oracle);
    oracles[_oracle].admin = _admin;

    emit OraclePermissionsUpdated(_oracle, true);
    emit OracleAdminUpdated(_oracle, _admin);
  }

  function removeOracle(
    address _oracle
  )
    private
  {
    require(oracleEnabled(_oracle), "oracle not enabled");

    oracles[_oracle].endingRound = reportingRoundId.add(1);
    address tail = oracleAddresses[uint256(oracleCount()).sub(1)];
    uint16 index = oracles[_oracle].index;
    oracles[tail].index = index;
    delete oracles[_oracle].index;
    oracleAddresses[index] = tail;
    oracleAddresses.pop();

    emit OraclePermissionsUpdated(_oracle, false);
  }

  function validateOracleRound(address _oracle, uint32 _roundId)
    private
    view
    returns (bytes memory)
  {
    // cache storage reads
    uint32 startingRound = oracles[_oracle].startingRound;
    uint32 rrId = reportingRoundId;

    if (startingRound == 0) return "not enabled oracle";
    if (startingRound > _roundId) return "not yet enabled oracle";
    if (oracles[_oracle].endingRound < _roundId) return "no longer allowed oracle";
    if (oracles[_oracle].lastReportedRound >= _roundId) return "cannot report on previous rounds";
    if (_roundId != rrId && _roundId != rrId.add(1) && !previousAndCurrentUnanswered(_roundId, rrId)) return "invalid round to report";
    if (_roundId != 1 && !supersedable(_roundId.sub(1))) return "previous round not supersedable";
  }

  function supersedable(uint32 _roundId)
    private
    view
    returns (bool)
  {
    return rounds[_roundId].updatedAt > 0 || timedOut(_roundId);
  }

  function oracleEnabled(address _oracle)
    private
    view
    returns (bool)
  {
    return oracles[_oracle].endingRound == ROUND_MAX;
  }

  function acceptingSubmissions(uint32 _roundId)
    private
    view
    returns (bool)
  {
    return details[_roundId].maxSubmissions != 0;
  }

  function delayed(address _oracle, uint32 _roundId)
    private
    view
    returns (bool)
  {
    uint256 lastStarted = oracles[_oracle].lastStartedRound;
    return _roundId > lastStarted + restartDelay || lastStarted == 0;
  }

  function newRound(uint32 _roundId)
    private
    view
    returns (bool)
  {
    return _roundId == reportingRoundId.add(1);
  }

  function validRoundId(uint256 _roundId)
    private
    view
    returns (bool)
  {
    return _roundId <= ROUND_MAX;
  }

}

interface AccessControllerInterface {
  function hasAccess(address user, bytes calldata data) external view returns (bool);
}

/**
 * @title SimpleWriteAccessController
 * @notice Gives access to accounts explicitly added to an access list by the
 * controller's owner.
 * @dev does not make any special permissions for externally, see
 * SimpleReadAccessController for that.
 */
contract SimpleWriteAccessController is AccessControllerInterface, Owned {

  bool public checkEnabled;
  mapping(address => bool) internal accessList;

  event AddedAccess(address user);
  event RemovedAccess(address user);
  event CheckAccessEnabled();
  event CheckAccessDisabled();

  constructor()
    public
  {
    checkEnabled = true;
  }

  /**
   * @notice Returns the access of an address
   * @param _user The address to query
   */
  function hasAccess(
    address _user,
    bytes memory
  )
    public
    view
    virtual
    override
    returns (bool)
  {
    return accessList[_user] || !checkEnabled;
  }

  /**
   * @notice Adds an address to the access list
   * @param _user The address to add
   */
  function addAccess(address _user)
    external
    onlyOwner()
  {
    if (!accessList[_user]) {
      accessList[_user] = true;

      emit AddedAccess(_user);
    }
  }

  /**
   * @notice Removes an address from the access list
   * @param _user The address to remove
   */
  function removeAccess(address _user)
    external
    onlyOwner()
  {
    if (accessList[_user]) {
      accessList[_user] = false;

      emit RemovedAccess(_user);
    }
  }

  /**
   * @notice makes the access check enforced
   */
  function enableAccessCheck()
    external
    onlyOwner()
  {
    if (!checkEnabled) {
      checkEnabled = true;

      emit CheckAccessEnabled();
    }
  }

  /**
   * @notice makes the access check unenforced
   */
  function disableAccessCheck()
    external
    onlyOwner()
  {
    if (checkEnabled) {
      checkEnabled = false;

      emit CheckAccessDisabled();
    }
  }

  /**
   * @dev reverts if the caller does not have access
   */
  modifier checkAccess() {
    require(hasAccess(msg.sender, msg.data), "No access");
    _;
  }
}

/**
 * @title SimpleReadAccessController
 * @notice Gives access to:
 * - any externally owned account (note that offchain actors can always read
 * any contract storage regardless of onchain access control measures, so this
 * does not weaken the access control while improving usability)
 * - accounts explicitly added to an access list
 * @dev SimpleReadAccessController is not suitable for access controlling writes
 * since it grants any externally owned account access! See
 * SimpleWriteAccessController for that.
 */
contract SimpleReadAccessController is SimpleWriteAccessController {

  /**
   * @notice Returns the access of an address
   * @param _user The address to query
   */
  function hasAccess(
    address _user,
    bytes memory _calldata
  )
    public
    view
    virtual
    override
    returns (bool)
  {
    return super.hasAccess(_user, _calldata) || _user == tx.origin;
  }

}

/**
 * @title AccessControlled FluxAggregator contract
 * @notice This contract requires addresses to be added to a controller
 * in order to read the answers stored in the FluxAggregator contract
 */
contract AccessControlledAggregator is FluxAggregator, SimpleReadAccessController {

  /**
   * @notice set up the aggregator with initial configuration
   * @param _link The address of the LINK token
   * @param _paymentAmount The amount paid of LINK paid to each oracle per submission, in wei (units of 10⁻¹⁸ LINK)
   * @param _timeout is the number of seconds after the previous round that are
   * allowed to lapse before allowing an oracle to skip an unfinished round
   * @param _validator is an optional contract address for validating
   * external validation of answers
   * @param _minSubmissionValue is an immutable check for a lower bound of what
   * submission values are accepted from an oracle
   * @param _maxSubmissionValue is an immutable check for an upper bound of what
   * submission values are accepted from an oracle
   * @param _decimals represents the number of decimals to offset the answer by
   * @param _description a short description of what is being reported
   */
  constructor(
    address _link,
    uint128 _paymentAmount,
    uint32 _timeout,
    address _validator,
    int256 _minSubmissionValue,
    int256 _maxSubmissionValue,
    uint8 _decimals,
    string memory _description
  ) public FluxAggregator(
    _link,
    _paymentAmount,
    _timeout,
    _validator,
    _minSubmissionValue,
    _maxSubmissionValue,
    _decimals,
    _description
  ){}

  /**
   * @notice get data about a round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values.
   * @param _roundId the round ID to retrieve the round data for
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started. This is 0
   * if the round hasn't been started yet.
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed. answeredInRound may be smaller than roundId when the round
   * timed out. answerInRound is equal to roundId when the round didn't time out
   * and was completed regularly.
   * @dev overridden funcion to add the checkAccess() modifier
   * @dev Note that for in-progress rounds (i.e. rounds that haven't yet
   * received maxSubmissions) answer and updatedAt may change between queries.
   */
  function getRoundData(uint80 _roundId)
    public
    view
    override
    checkAccess()
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return super.getRoundData(_roundId);
  }

  /**
   * @notice get data about the latest round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values. Consumers are encouraged to
   * use this more fully featured method over the "legacy" latestAnswer
   * functions. Consumers are encouraged to check that they're receiving fresh
   * data by inspecting the updatedAt and answeredInRound return values.
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started. This is 0
   * if the round hasn't been started yet.
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed. answeredInRound may be smaller than roundId when the round
   * timed out. answerInRound is equal to roundId when the round didn't time out
   * and was completed regularly.
   * @dev overridden funcion to add the checkAccess() modifier
   * @dev Note that for in-progress rounds (i.e. rounds that haven't yet
   * received maxSubmissions) answer and updatedAt may change between queries.
   */
  function latestRoundData()
    public
    view
    override
    checkAccess()
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return super.latestRoundData();
  }

  /**
   * @notice get the most recently reported answer
   * @dev overridden funcion to add the checkAccess() modifier
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestAnswer()
    public
    view
    override
    checkAccess()
    returns (int256)
  {
    return super.latestAnswer();
  }

  /**
   * @notice get the most recently reported round ID
   * @dev overridden funcion to add the checkAccess() modifier
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestRound()
    public
    view
    override
    checkAccess()
    returns (uint256)
  {
    return super.latestRound();
  }

  /**
   * @notice get the most recent updated at timestamp
   * @dev overridden funcion to add the checkAccess() modifier
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestTimestamp()
    public
    view
    override
    checkAccess()
    returns (uint256)
  {
    return super.latestTimestamp();
  }

  /**
   * @notice get past rounds answers
   * @dev overridden funcion to add the checkAccess() modifier
   * @param _roundId the round number to retrieve the answer for
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getAnswer(uint256 _roundId)
    public
    view
    override
    checkAccess()
    returns (int256)
  {
    return super.getAnswer(_roundId);
  }

  /**
   * @notice get timestamp when an answer was last updated
   * @dev overridden funcion to add the checkAccess() modifier
   * @param _roundId the round number to retrieve the updated timestamp for
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getTimestamp(uint256 _roundId)
    public
    view
    override
    checkAccess()
    returns (uint256)
  {
    return super.getTimestamp(_roundId);
  }

}

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