Contract 0xd421a75544faf2b3f45c77f63c3f4dc6a3d0dd50

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

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

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "./CronosOracleBase.sol";
import "./CronosOracleReader.sol";
import "./CronosOracleUpdater.sol";
import "./CronosOracleStorage.sol";

contract CronosOracle is 
  AggregatorV2V3Interface,
  CronosOracleBase,
  CronosOracleUpdater,
  CronosOracleReader {

  constructor(
    uint8 __decimals,
    string memory __description
  ) {
    _decimals = __decimals;
    _description = __description;
  }


}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interface/chainlink/AggregatorV2V3Interface.sol";

abstract contract CronosOracleBase is Ownable {}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "./CronosOracleStorage.sol";
import "./interface/chainlink/AggregatorV2V3Interface.sol";

contract CronosOracleReader is CronosOracleStorage, AggregatorV2V3Interface {

  string constant private V3_NO_DATA_ERROR = "No data present";

  function latestAnswer()
    override
    external
    view
    returns (
      int256
    )
  {
    return prices[lastCompletedRoundId];
  }
  
  function latestTimestamp()
    override
    external
    view
    returns (
      uint256
    ) {
    return updatedTimestamps[lastCompletedRoundId];
  }

  function latestRound()
    override
    external
    view
    returns (
      uint256
    ) {
    return lastCompletedRoundId;
  }

  function getAnswer(
    uint256 _roundId
  )
    override
    external
    view
    returns (
      int256
    ) {
    return prices[_roundId];
  }

  function getTimestamp(
    uint256 _roundId
  )
    override
    external
    view
    returns (
      uint256
    ) {
    return updatedTimestamps[_roundId];
  }

  function decimals()
    override
    external
    view
    returns (
      uint8
    ) {
    return _decimals;
  }

  function description()
    override
    external
    view
    returns (
      string memory
    ) {
    return _description;
  }

  function version()
    override
    external
    view
    returns (
      uint256
    ) {
    return _version;
  }

  // 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
  )
    override
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return _getRoundData(_roundId);
  }

  function latestRoundData()
    override
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    ) {
    return _getRoundData(uint80(lastCompletedRoundId));
    }

  /*
   * Internal
   */

  function _getRoundData(uint80 _roundId)
    internal
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    answer = prices[_roundId];
    uint64 timestamp = uint64(updatedTimestamps[_roundId]);

    require(timestamp > 0, V3_NO_DATA_ERROR);

    return (_roundId, answer, timestamp, timestamp, _roundId);
  }


}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";

contract CronosOracleStorage {

  uint8 public _decimals;
  string public _description;
  uint256 constant public _version = 2;

  uint256 internal lastCompletedRoundId;
  uint256 internal lastUpdatedTimestamp;

  mapping(uint256 => int256) internal prices;               // roundId to price
  mapping(uint256 => uint256) internal updatedTimestamps;   // roundId to timestamp

  mapping(address => bool) internal authorizedUpdaters;
}

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./CronosOracleStorage.sol";
import "./CronosOracleBase.sol";

contract CronosOracleUpdater is CronosOracleStorage, CronosOracleBase {

  event PriceUpdated(
    uint256 indexed roundId,
    uint256 indexed timestamp,
    int256 indexed price
  );

  function updatePrice(
    uint256 _roundId,
    uint256 _timestamp,
    int256 _newPrice
  ) public onlyAuthorizedUpdaters {
    lastCompletedRoundId = _roundId;
    lastUpdatedTimestamp = _timestamp;
    prices[_roundId] = _newPrice;
    updatedTimestamps[_roundId] = _timestamp;

    emit PriceUpdated(_roundId, _timestamp, _newPrice);
  }

  // gas savings when we don't send the timestamp in calldata
  function updatePriceNoTimestamp(
    uint256 _roundId,
    int256 _newPrice
  ) external onlyAuthorizedUpdaters {
    updatePrice((_roundId), block.timestamp, _newPrice);
  }

  modifier onlyAuthorizedUpdaters() {
    if (_msgSender() != owner()) {
      require(authorizedUpdaters[_msgSender()], "Caller not authorized");
    }
    _;
  }

  function addAuthorizedUpdater(address signer) public onlyOwner returns (bool) {
    bool wasAuthorized = authorizedUpdaters[signer];
    if (wasAuthorized) {
      return false;
    } else {
      authorizedUpdaters[signer] = true;
      return true;
    }
  }

  function removeAuthorizedUpdater(address signer) public onlyOwner returns (bool) {
    bool wasAuthorized = authorizedUpdaters[signer];
    delete authorizedUpdaters[signer];
    return wasAuthorized;
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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
  );
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./AggregatorInterface.sol";
import "./AggregatorV3Interface.sol";

interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface
{
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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
    );

}

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

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mp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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