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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.17;

import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import {IChronicle} from "./IChronicle.sol";
import {OracleAggregator, IOracleAggregator} from "./OracleAggregator.sol";

/**
 * @title Chronicle_Aggor_BTC_USD
 * @notice A concrete implementation of the OracleAggregator designed specifically for BTC/USD.
 */
contract Chronicle_Aggor_BTC_USD is OracleAggregator {
    /// @notice Thrown when a caller is not an authorized data consumer.
    error UnathorisedDataConsumer(address consumer);

    /**
     * @notice Returns a brief description of this price feed.
     * @dev For compatibility with Chainlink’s AggregatorV3Interface.
     * @return description A human-readable description of the aggregator.
     */
    function description() public view virtual override returns (string memory) {
        return "Aggregated price feed BTC/USD from Chronicle, Chainlink, and RedStone oracles";
    }

    /// @inheritdoc IOracleAggregator
    function chronicle() public pure virtual override returns (IChronicle) {
        return IChronicle(0x24C392CDbF32Cf911B258981a66d5541d85269ce);
    }

    /// @inheritdoc IOracleAggregator
    function chainlink() public pure virtual override returns (AggregatorV3Interface) {
        return AggregatorV3Interface(0xF4030086522a5bEEa4988F8cA5B36dbC97BeE88c);
    }

    /// @inheritdoc IOracleAggregator
    function redstone() public pure virtual override returns (AggregatorV3Interface) {
        return AggregatorV3Interface(0xAB7f623fb2F6fea6601D4350FA0E2290663C28Fc);
    }

    /// @inheritdoc IOracleAggregator
    function checkAuthorisedDataConsumer(address consumer) public pure virtual override {
        // Open for everyone
    }

    /// @inheritdoc IOracleAggregator
    function getAgeThreshold() public pure virtual override returns (uint32) {
        return 25 hours; // in seconds
    }
}

// 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);

  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
    );
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

/**
 * @title IChronicle
 *
 * @notice Interface for Chronicle Protocol's oracle products
 */
interface IChronicle {
    /// @notice Returns the oracle's identifier.
    /// @return wat The oracle's identifier.
    function wat() external view returns (bytes32 wat);

    /// @notice Returns the oracle's current value.
    /// @dev Reverts if no value set.
    /// @return value The oracle's current value.
    function read() external view returns (uint value);

    /// @notice Returns the oracle's current value and its age.
    /// @dev Reverts if no value set.
    /// @return value The oracle's current value.
    /// @return age The value's age.
    function readWithAge() external view returns (uint value, uint age);

    /// @notice Returns the oracle's current value.
    /// @return isValid True if value exists, false otherwise.
    /// @return value The oracle's current value if it exists, zero otherwise.
    function tryRead() external view returns (bool isValid, uint value);

    /// @notice Returns the oracle's current value and its age.
    /// @return isValid True if value exists, false otherwise.
    /// @return value The oracle's current value if it exists, zero otherwise.
    /// @return age The value's age if value exists, zero otherwise.
    function tryReadWithAge()
        external
        view
        returns (bool isValid, uint value, uint age);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.17;

import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import {IChronicle} from "./IChronicle.sol";

/**
 * @title IOracleAggregator
 * @notice Interface for a contract that aggregates data from multiple oracle sources.
 */
interface IOracleAggregator {

    /**
     * @notice Fetches the aggregated oracle value from multiple sources.
     * @return value The median price from all valid oracles.
     * @return goodOraclesCount The number of oracles that returned a valid, non-stale value.
     */
    function getAggregatedOracleValue() external view returns (uint256 value, uint8 goodOraclesCount);


    // Immutable Configurations

    /**
     * @notice Returns the Chronicle oracle contract.
     * @dev Must be configured to return 18-decimals price data.
     * @return chronicle The chronicle oracle contract address.
     */
    function chronicle() external view returns (IChronicle chronicle);

    /**
     * @notice Returns the Chainlink oracle contract.
     * @dev Must be a price feed with 8 decimals.
     * @return chainlink The Chainlink PriceFeed address.
     */
    function chainlink() external view returns (AggregatorV3Interface chainlink);

    /**
     * @notice Returns the RedStone oracle contract.
     * @dev Must be a price feed with 8 decimals.
     * @return redstone The RedStone PriceFeed address.
     */
    function redstone() external view returns (AggregatorV3Interface redstone);

    /**
     * @notice Returns the maximum allowed age of price data (in seconds) for it to be considered valid.
     * @dev The age threshold is used to prevent stale prices from being counted.
     * @return ageThreshold The age threshold, in seconds.
     */
    function getAgeThreshold() external view returns(uint32);

    /**
     * @notice Checks whether a given address is authorized to consume price data.
     * @dev Reverts if the consumer is not authorized. This check is used only in
     *      the `latestAnswer` and the `latestRoundData` functions. The `getAggregatedOracleValue`
     *      function is open for everyone
     * @param consumer The address for which to check authorization.
     */
    function checkAuthorisedDataConsumer(address consumer) external view;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.17;

library NumericArrayLib {
  uint256 constant UINT256_SHIFT = 5; // 2 ** 5 == 32
  uint256 constant BYTES_ARR_LEN_VAR_BS = 32;
  uint256 constant UINT256_VALUE_BS = 32;

  error CanNotPickMedianOfEmptyArray();

  // This function modifies the array if it has more than 3 elements
  // We handle cases for up to 3 elements manually to optimise gas cost (~700 gas)
  function pickMedian(uint256[] memory arr) internal pure returns (uint256) {
    if (arr.length == 3) {
      if (arr[0] < arr[1]) {
        if (arr[1] < arr[2]) {
          return arr[1]; // arr[0] < arr[1] < arr[2]
        } else {
          return arr[0] > arr[2] ? arr[0] : arr[2];
        }
      } else { // arr[0] >= arr[1]
        if (arr[0] < arr[2]) {
          return arr[0]; // arr[1] <= arr[0] < arr[2]
        } else {
          return arr[1] > arr[2] ? arr[1] : arr[2];
        }
      }
    }

    if (arr.length == 2) return (arr[0] + arr[1]) / 2;
    if (arr.length == 1) return arr[0];
    if (arr.length == 0) revert CanNotPickMedianOfEmptyArray();

    // For arr.length > 3
    sort(arr);
    uint256 middleIndex = arr.length / 2;
    if (arr.length % 2 == 0) {
      uint256 sum = arr[middleIndex - 1] + arr[middleIndex];
      return sum / 2;
    } else {
      return arr[middleIndex];
    }
  }

  // This function sorts an array in memory using a simple sort algorithm,
  // which performs even better than quick sort for small arrays
  function sort(uint256[] memory arr) internal pure {
    assembly {
      let arrLength := mload(arr)
      let valuesPtr := add(arr, BYTES_ARR_LEN_VAR_BS) // memory location of arr[0]
      let endPtr := add(valuesPtr, shl(UINT256_SHIFT, arrLength)) // shl(UINT256_SHIFT, arrLength) == UINT256_VALUE_BS * arrLength
      for {
        let arrIPtr := add(valuesPtr, UINT256_VALUE_BS) // starting from arr[1]
      } lt(arrIPtr, endPtr) {
        arrIPtr := add(arrIPtr, UINT256_VALUE_BS) // arrIPtr += 32
      } {
        for {
          let arrJPtr := valuesPtr
        } lt(arrJPtr, arrIPtr) {
          arrJPtr := add(arrJPtr, UINT256_VALUE_BS) // arrJPtr += 32
        } {
          let arrI := mload(arrIPtr)
          let arrJ := mload(arrJPtr)
          if lt(arrI, arrJ) {
            mstore(arrIPtr, arrJ)
            mstore(arrJPtr, arrI)
          }
        }
      }
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.17;

import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import {NumericArrayLib} from "./libs/NumericArrayLib.sol";
import {IChronicle} from "./IChronicle.sol";
import {IOracleAggregator} from "./IOracleAggregator.sol";

/**
 * @title OracleAggregator
 * @notice This contract aggregates price data from multiple blockchain oracles: Chainlink, Chronicle, and RedStone.
 *
 * Important note: This aggregator does not check the decimals of the configured feeds.
 * Ensure `redstone()` and `chainlink()` return values with 8 decimals, and `chronicle()` returns 18 decimals internally.
 *
 * ## Key Principles:
 * - **Simplicity:** The contract is designed to be as simple as possible to minimize the risk of bugs.
 * - **Immutable Configuration:** There are no in-contract authorization mechanisms for admin wallets. Any changes require deploying a new version of the contract.
 * - **Partial AggregatorV3Interface Implementation:** The contract implements only `latestRoundData` and `latestAnswer` functions to reduce complexity.
 * - **Whitelisted Reads:** Only authorized addresses can call `latestRoundData` and `latestAnswer`. Access is configured in the `checkAuthorisedDataConsumer` method.
 * - **Gas Optimization:** Uses low-level calls and avoids unnecessary storage reads to reduce gas consumption.
 * - **Oracle Isolation:** Each oracle call has a gas limit and low-level error handling to isolate failures. This ensures that a malfunction or compromise of one oracle won't impact the aggregator's reliability.
 * - **Separation of Concerns:** The core logic resides in this contract (`OracleAggregator.sol`), while the configuration is handled in separate contracts (e.g. `Chronicle_Aggor_BTC_USD.sol`).
 */
abstract contract OracleAggregator is AggregatorV3Interface, IOracleAggregator {
    /// @notice Thrown when a function is called that is not supported by this aggregator.
    error UnsupportedFunction();

    /// @notice The number of decimals for the final aggregated price.
    uint8 public constant decimals = 8;

    // Internal constants
    uint256 internal constant _CHRONICLE_DECIMALS = 18;
    uint256 internal constant _CHRONICLE_SCALE_FAKTOR = 10 ** (_CHRONICLE_DECIMALS - decimals);
    uint256 internal constant _GAS_LIMIT_PER_ORACLE_READ = 500_000; // Average gas cost for oracle calls is ~20K. It's quite safe, but in case of ethereum hardforks (with signifncant changes in gas calculation) we would need to deploy a new version of this contract
    uint256 internal constant _LATEST_ROUND_DATA_RETURN_SIZE = 160;
    uint256 internal constant _TRY_READ_WITH_AGE_RETURN_SIZE = 96;

    /// @inheritdoc IOracleAggregator
    function chainlink() public view virtual returns (AggregatorV3Interface);

    /// @inheritdoc IOracleAggregator
    function redstone() public view virtual returns (AggregatorV3Interface);

    /// @inheritdoc IOracleAggregator
    function chronicle() public view virtual returns (IChronicle);

    /// @inheritdoc IOracleAggregator
    function checkAuthorisedDataConsumer(address consumer) public view virtual;

    /// @inheritdoc IOracleAggregator
    function getAgeThreshold() public view virtual returns (uint32);

    /// @inheritdoc IOracleAggregator
    function getAggregatedOracleValue() public view returns (uint256 value, uint8 goodOraclesCount) {
        (bool okChronicle, uint256 valChronicle) = _safeReadFromChronicle();
        (bool okChainlink, uint256 valChainlink) = _safeLatestRoundData(chainlink());
        (bool okRedstone, uint256 valRedstone) = _safeLatestRoundData(redstone());

        assembly {
            goodOraclesCount := add(add(okChronicle, okChainlink), okRedstone) // ((okChronicle ? 1 : 0) + (okChainlink ? 1 : 0)) + (okRedstone ? 1 : 0)
        }
        uint256 insertIndex = 0;
        uint256[] memory values = new uint256[](goodOraclesCount);

        if (okChronicle) values[insertIndex++] = valChronicle;
        if (okChainlink) values[insertIndex++] = valChainlink;
        if (okRedstone) values[insertIndex++] = valRedstone;

        value = NumericArrayLib.pickMedian(values);
    }

    /**
     * @notice Safely calls `latestRoundData` on a Chainlink-compatible Price Feed contract
     * @dev The priceFeed must have use 8 decimals
     * @param priceFeed The address of the Chainlink Price Feed contract
     * @return success If the call succeeded and is not stale
     * @return value The oracle value (with 8 decimals)
     */
    function _safeLatestRoundData(AggregatorV3Interface priceFeed)
        internal
        view
        returns (bool success, uint256 value)
    {
        bytes memory data = abi.encodeWithSelector(AggregatorV3Interface.latestRoundData.selector);

        bytes memory returnData;

        (success, returnData) = address(priceFeed).staticcall{gas: _GAS_LIMIT_PER_ORACLE_READ}(data);

        if (success && returnData.length == _LATEST_ROUND_DATA_RETURN_SIZE) {
            // Checking returnData.length to avoid failures in abi.decode
            ( /* roundId */ , int256 answer, /* startedAt */, uint256 updatedAt, /* answeredInRound */ ) =
                abi.decode(returnData, (uint80, int256, uint256, uint256, uint80));

            bool isStale;
            unchecked {
                isStale = updatedAt < block.timestamp - getAgeThreshold();
            }

            if (isStale || answer <= 0 || uint256(answer) > uint256(type(uint128).max)) {
                return (false, 0);
            }

            return (true, uint256(answer));
        }

        return (false, 0);
    }

    /**
     * @notice Safely calls `tryReadWithAge` on the Chronicle Oracle contract.
     * @return success True if the call was successful and the data is valid and not stale.
     * @return value The oracle's returned price value, scaled to 8 decimals.
     */
    function _safeReadFromChronicle() internal view returns (bool success, uint256 value) {
        bytes memory data = abi.encodeWithSelector(IChronicle.tryReadWithAge.selector);
        (bool callSuccess, bytes memory returnData) =
            address(chronicle()).staticcall{gas: _GAS_LIMIT_PER_ORACLE_READ}(data);

        if (callSuccess && returnData.length == _TRY_READ_WITH_AGE_RETURN_SIZE) {
            // Checking returnData.length to avoid failures in abi.decode
            (bool isValid, uint256 chronicleValue, uint256 age) = abi.decode(returnData, (bool, uint256, uint256));

            if (!isValid) {
                return (false, 0);
            }

            bool isStale;
            unchecked {
                isStale = age < block.timestamp - getAgeThreshold();
            }

            if (isStale) {
                // We don't do assertions for the size of the number here, because we will divide the value by 10**10 below
                return (false, 0);
            }

            chronicleValue /= _CHRONICLE_SCALE_FAKTOR;

            return (true, chronicleValue);
        }

        return (false, 0);
    }

    /**
     * @notice Returns the latest round data as defined by `AggregatorV3Interface`.
     * @dev Only authorized data consumers can read the data.
     * @return roundId A fixed round ID (always 1 in this implementation).
     * @return answer The aggregated price as an `int256`.
     * @return startedAt The current block timestamp (we don't aggregate timestamps from different oracles).
     * @return updatedAt The current block timestamp (we don't aggregate timestamps from different oracles).
     * @return answeredInRound Equal to `roundId`.
     */
    function latestRoundData()
        external
        view
        virtual
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        checkAuthorisedDataConsumer(msg.sender);
        (uint256 value, /* goodOraclesCount */ ) = getAggregatedOracleValue();

        roundId = 1;
        answer = int256(value);
        startedAt = block.timestamp;
        updatedAt = block.timestamp;
        answeredInRound = 1;
    }

    /**
     * @notice Returns the latest aggregated answer as defined by `AggregatorV3Interface`.
     * @dev Only authorized data consumers can read the data.
     * @return The aggregated price as an `int256`.
     */
    function latestAnswer() external view returns (int256) {
        checkAuthorisedDataConsumer(msg.sender);
        (uint256 value, /* goodOraclesCount */ ) = getAggregatedOracleValue();

        return int256(value);
    }

    /// @notice This function is not supported.
    function latestRound() external pure virtual returns (uint80) {
        revert UnsupportedFunction();
    }

    /// @notice This function is not supported.
    function getRoundData(uint80 /* requestedRoundId */ )
        external
        pure
        override
        returns (uint80, int256, uint256, uint256, uint80)
    {
        revert UnsupportedFunction();
    }

    /**
     * @notice Returns the version of this aggregator
     * @return version
     */
    function version() external pure virtual override returns (uint256) {
        return 1;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[],"name":"CanNotPickMedianOfEmptyArray","type":"error"},{"inputs":[{"internalType":"address","name":"consumer","type":"address"}],"name":"UnathorisedDataConsumer","type":"error"},{"inputs":[],"name":"UnsupportedFunction","type":"error"},{"inputs":[],"name":"chainlink","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"consumer","type":"address"}],"name":"checkAuthorisedDataConsumer","outputs":[],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"chronicle","outputs":[{"internalType":"contract IChronicle","name":"","type":"address"}],"stateMutability":"pure","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":"getAgeThreshold","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getAggregatedOracleValue","outputs":[{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint8","name":"goodOraclesCount","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"","type":"uint80"},{"internalType":"int256","name":"","type":"int256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint80","name":"","type":"uint80"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRound","outputs":[{"internalType":"uint80","name":"","type":"uint80"}],"stateMutability":"pure","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":"redstone","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"}]

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