Address io1c2tw06ft8n5yaxl40q9y0merrc22g5rd2mgq0l

// File: contracts/src/v0.6/vendor/SafeMathChainlink.sol


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 SafeMathChainlink {
  /**
    * @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;
  }
}

// File: contracts/src/v0.6/interfaces/AggregatorV3Interface.sol


pragma solidity ^0.6.0;

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
    );

}

// File: contracts/src/v0.6/vendor/Ownable.sol


pragma solidity ^0.6.0;

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

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

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

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

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

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

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

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

// File: contracts/src/v0.6/ShadowAggregator.sol


pragma solidity 0.6.6;




/**
 * @title The Prepaid Aggregator contract
 * @notice Handles aggregating data pushed in from off-chain. 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 ShadowAggregator is AggregatorV3Interface, Ownable {
  using SafeMathChainlink for uint256;

  enum Role{Unset, Transmitter, Signer}

  struct Round {
    int256 answer;
    uint256 startedAt;
    uint256 updatedAt;
    uint80 answeredInRound;
  }

  struct Oracle {
    uint16 index;
    Role role;
  }

  AggregatorV3Interface public aggregator;

  uint8 private dcls;
  string private desc;
  address public originAggregator;

  uint256 constant private MAX_ORACLE_COUNT = 31;
  uint80 constant private ROUND_MAX = 2**80-1;

  uint40 internal latestEpochAndRound;
  uint80 public latestRoundId;
  bytes16 public configDigest;
  uint32 public configCount;
  mapping(uint80 => Round) internal rounds;
  mapping(address => Oracle) public oracles;
  address[] private signers;
  address[] private transmitters;

  event SubmissionReceived(
    int256 indexed submission,
    uint80 indexed round,
    address indexed oracle
  );

  constructor(
    address _origin,
    uint8 _decimals,
    string memory _description
  ) public {
    originAggregator = _origin;
    dcls = _decimals;
    desc = _description;
  }

  function decimals() external override view returns (uint8) {
    AggregatorV3Interface aggr = aggregator;
    if (address(aggr) != address(0)) {
      return aggr.decimals();
    }
    return dcls;
  }

  function description() external override view returns (string memory) {
    AggregatorV3Interface aggr = aggregator;
    if (address(aggr) != address(0)) {
      return aggr.description();
    }
    return desc;
  }

  function version() external override view returns (uint256) {
    AggregatorV3Interface aggr = aggregator;
    if (address(aggr) != address(0)) {
      return aggr.version();
    }
    return 4;
  }

  function setConfigCount(uint32 _count) external onlyOwner {
    configCount = _count;
  }

  function setAggregator(AggregatorV3Interface _aggregator) external onlyOwner {
    aggregator = _aggregator;
  }

  /**
   * @notice sets offchain reporting protocol configuration incl. participating oracles
   * @param _signers addresses with which oracles sign the reports
   * @param _transmitters addresses oracles use to transmit the reports
   * @param _threshold number of faulty oracles the system can tolerate
   * @param _encodedConfigVersion version number for offchainEncoding schema
   * @param _encoded encoded off-chain oracle configuration
   */
  function setConfig(
    address[] calldata _signers,
    address[] calldata _transmitters,
    uint8 _threshold,
    uint64 _encodedConfigVersion,
    bytes calldata _encoded
  )
    external
    onlyOwner()
  {
    while (signers.length != 0) { // remove any old signer/transmitter addresses
      uint lastIdx = signers.length - 1;
      address signer = signers[lastIdx];
      address transmitter = transmitters[lastIdx];
      delete oracles[signer];
      delete oracles[transmitter];
      signers.pop();
      transmitters.pop();
    }

    for (uint i = 0; i < _signers.length; i++) { // add new signer/transmitter addresses
      require(
        oracles[_signers[i]].role == Role.Unset,
        "repeated signer address"
      );
      oracles[_signers[i]] = Oracle(uint8(i), Role.Signer);
      require(
        oracles[_transmitters[i]].role == Role.Unset,
        "repeated transmitter address"
      );
      oracles[_transmitters[i]] = Oracle(uint8(i), Role.Transmitter);
      signers.push(_signers[i]);
      transmitters.push(_transmitters[i]);
    }
    configCount += 1;
    configDigest = configDigestFromConfigData(
      originAggregator,
      configCount,
      _signers,
      _transmitters,
      _threshold,
      _encodedConfigVersion,
      _encoded
    );
    latestEpochAndRound = 0;
  }

  function configDigestFromConfigData(
    address _contractAddress,
    uint64 _configCount,
    address[] memory _signers,
    address[] memory _transmitters,
    uint8 _threshold,
    uint64 _encodedConfigVersion,
    bytes memory _encodedConfig
  ) internal pure returns (bytes16) {
    return bytes16(keccak256(abi.encode(_contractAddress, _configCount,
      _signers, _transmitters, _threshold, _encodedConfigVersion, _encodedConfig
    )));
  }

  /**
   * @notice called by oracles when they have witnessed a need to update
   * @param _report is the observations
   * @param _rs is the r of oracles
   * @param _ss is the s of oracles
   * @param _rawVs is the v of oracles
   */
  function submit(
    bytes calldata _report,
    bytes32[] calldata _rs, bytes32[] calldata _ss, bytes32 _rawVs
  )
    external
  {
    require(_rs.length == _ss.length, "signatures out of registration");
    require(_rs.length <= MAX_ORACLE_COUNT, "too many signatures");
    {
      bytes32 h = keccak256(_report);
      bool[MAX_ORACLE_COUNT] memory signed;
      Oracle memory oracle;
      for (uint i = 0; i < _rs.length; i++) {
        address signer = ecrecover(h, uint8(_rawVs[i])+27, _rs[i], _ss[i]);
        oracle = oracles[signer];
        require(oracle.role == Role.Signer, "not an active oracle");
        require(!signed[oracle.index], "non-unique signature");
        signed[oracle.index] = true;
      }
    }
    (bytes32 rawReportContext, bytes32 rawObservers, int192[] memory observations) = abi.decode(_report, (bytes32, bytes32, int192[]));
    require(bytes16(rawReportContext << 88) == configDigest, "config digest mismatch");
    uint40 epochAndRound = uint40(uint256(rawReportContext));
    require(latestEpochAndRound < epochAndRound, "stale report");
    bytes memory observers = new bytes(observations.length);
    {
      bool[MAX_ORACLE_COUNT] memory seen;
      for (uint8 i = 0; i < observations.length; i++) {
        uint8 observerIdx = uint8(rawObservers[i]);
        require(!seen[observerIdx], "duplicate observer index");
        seen[observerIdx] = true;
        observers[i] = rawObservers[i];
      }
    }
    for (uint8 i = 0; i < observations.length - 1; i++) {
      bool inOrder = observations[i] <= observations[i+1];
      require(inOrder, "observations not sorted");
    }
    int192 median = observations[observations.length/2];
    uint80 rid = latestRoundId + 1;
    rounds[rid].answer = median;
    rounds[rid].startedAt = block.timestamp;
    rounds[rid].updatedAt = block.timestamp;
    rounds[rid].answeredInRound = rid;
    latestRoundId = rid;
    latestEpochAndRound = epochAndRound;
  }

  function oracleCount() public view returns (uint8) {
    return uint8(signers.length);
  }

  function getOracles() external view returns (address[] memory) {
    return signers;
  }

  function getRoundData(uint80 _roundId)
    public
    view
    virtual
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    AggregatorV3Interface aggr = aggregator;
    if (address(aggr) != address(0)) {
      return aggr.getRoundData(_roundId);
    }
    Round memory r = rounds[uint64(_roundId)];

    require(r.answeredInRound > 0 && _roundId <= ROUND_MAX, "No data present");

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

  function latestRoundData()
    public
    view
    virtual
    override
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    AggregatorV3Interface aggr = aggregator;
    if (address(aggr) != address(0)) {
      return aggr.latestRoundData();
    }
    return getRoundData(latestRoundId);
  }
}

[{"inputs":[{"internalType":"address","name":"_origin","type":"address"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"string","name":"_description","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"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":"int256","name":"submission","type":"int256"},{"indexed":true,"internalType":"uint80","name":"round","type":"uint80"},{"indexed":true,"internalType":"address","name":"oracle","type":"address"}],"name":"SubmissionReceived","type":"event"},{"inputs":[],"name":"aggregator","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"configCount","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"configDigest","outputs":[{"internalType":"bytes16","name":"","type":"bytes16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getOracles","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundId","outputs":[{"internalType":"uint80","name":"","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"oracleCount","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"oracles","outputs":[{"internalType":"uint16","name":"index","type":"uint16"},{"internalType":"enum ShadowAggregator.Role","name":"role","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"originAggregator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract AggregatorV3Interface","name":"_aggregator","type":"address"}],"name":"setAggregator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_signers","type":"address[]"},{"internalType":"address[]","name":"_transmitters","type":"address[]"},{"internalType":"uint8","name":"_threshold","type":"uint8"},{"internalType":"uint64","name":"_encodedConfigVersion","type":"uint64"},{"internalType":"bytes","name":"_encoded","type":"bytes"}],"name":"setConfig","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_count","type":"uint32"}],"name":"setConfigCount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"_report","type":"bytes"},{"internalType":"bytes32[]","name":"_rs","type":"bytes32[]"},{"internalType":"bytes32[]","name":"_ss","type":"bytes32[]"},{"internalType":"bytes32","name":"_rawVs","type":"bytes32"}],"name":"submit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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