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// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.4;

import "@prb/contracts/access/Ownable.sol";
import "@prb/contracts/token/erc20/IErc20.sol";

import "./IChainlinkOperator.sol";

/// @title ChainlinkOperator
/// @author Hifi
contract ChainlinkOperator is
    IChainlinkOperator, // no dependency
    Ownable // one dependency
{
    /// PUBLIC STORAGE ///

    /// @dev Mapping between Erc20 symbols and Feed structs.
    mapping(string => Feed) internal feeds;

    /// @inheritdoc IChainlinkOperator
    uint256 public constant override pricePrecision = 8;

    /// @inheritdoc IChainlinkOperator
    uint256 public constant override pricePrecisionScalar = 1.0e10;

    /// @inheritdoc IChainlinkOperator
    uint256 public override priceStalenessThreshold;

    constructor() Ownable() {
        priceStalenessThreshold = 1 days;
    }

    /// CONSTANT FUNCTIONS ///

    /// @inheritdoc IChainlinkOperator
    function getFeed(string memory symbol)
        external
        view
        override
        returns (
            IErc20,
            IAggregatorV3,
            bool
        )
    {
        return (feeds[symbol].asset, feeds[symbol].id, feeds[symbol].isSet);
    }

    /// @inheritdoc IChainlinkOperator
    function getNormalizedPrice(string memory symbol) external view override returns (uint256) {
        uint256 price = getPrice(symbol);
        uint256 normalizedPrice = price * pricePrecisionScalar;
        return normalizedPrice;
    }

    /// @inheritdoc IChainlinkOperator
    function getPrice(string memory symbol) public view override returns (uint256) {
        if (!feeds[symbol].isSet) {
            revert ChainlinkOperator__FeedNotSet(symbol);
        }
        (, int256 intPrice, , uint256 latestUpdateTimestamp, ) = IAggregatorV3(feeds[symbol].id).latestRoundData();
        if (block.timestamp - latestUpdateTimestamp > priceStalenessThreshold) {
            revert ChainlinkOperator__PriceStale(symbol);
        }
        if (intPrice <= 0) {
            revert ChainlinkOperator__PriceLessThanOrEqualToZero(symbol);
        }
        uint256 price = uint256(intPrice);
        return price;
    }

    /// PUBLIC NON-CONSTANT FUNCTIONS ///

    /// @inheritdoc IChainlinkOperator
    function deleteFeed(string memory symbol) external override onlyOwner {
        // Checks
        if (!feeds[symbol].isSet) {
            revert ChainlinkOperator__FeedNotSet(symbol);
        }

        // Effects: delete the feed from storage.
        IAggregatorV3 feed = feeds[symbol].id;
        IErc20 asset = feeds[symbol].asset;
        delete feeds[symbol];

        emit DeleteFeed(asset, feed);
    }

    /// @inheritdoc IChainlinkOperator
    function setFeed(IErc20 asset, IAggregatorV3 feed) external override onlyOwner {
        string memory symbol = asset.symbol();

        // Checks: price precision.
        uint8 decimals = feed.decimals();
        if (decimals != pricePrecision) {
            revert ChainlinkOperator__DecimalsMismatch(symbol, decimals);
        }

        // Effects: put the feed into storage.
        feeds[symbol] = Feed({ asset: asset, id: feed, isSet: true });

        emit SetFeed(asset, feed);
    }

    /// @inheritdoc IChainlinkOperator
    function setPriceStalenessThreshold(uint256 newPriceStalenessThreshold) external override onlyOwner {
        // Effects: update storage.
        uint256 oldPriceStalenessThreshold = priceStalenessThreshold;
        priceStalenessThreshold = newPriceStalenessThreshold;

        emit SetPriceStalenessThreshold(oldPriceStalenessThreshold, newPriceStalenessThreshold);
    }
}

// SPDX-License-Identifier: Unlicense
pragma solidity >=0.8.4;

import "./IOwnable.sol";

/// @notice Emitted when the caller is not the owner.
error Ownable__NotOwner(address owner, address caller);

/// @notice Emitted when setting the owner to the zero address.
error Ownable__OwnerZeroAddress();

/// @title Ownable
/// @author Paul Razvan Berg
contract Ownable is IOwnable {
    /// PUBLIC STORAGE ///

    /// @inheritdoc IOwnable
    address public override owner;

    /// MODIFIERS ///

    /// @notice Throws if called by any account other than the owner.
    modifier onlyOwner() {
        if (owner != msg.sender) {
            revert Ownable__NotOwner(owner, msg.sender);
        }
        _;
    }

    /// CONSTRUCTOR ///

    /// @notice Initializes the contract setting the deployer as the initial owner.
    constructor() {
        address msgSender = msg.sender;
        owner = msgSender;
        emit TransferOwnership(address(0), msgSender);
    }

    /// PUBLIC NON-CONSTANT FUNCTIONS ///

    /// @inheritdoc IOwnable
    function _renounceOwnership() public virtual override onlyOwner {
        emit TransferOwnership(owner, address(0));
        owner = address(0);
    }

    /// @inheritdoc IOwnable
    function _transferOwnership(address newOwner) public virtual override onlyOwner {
        if (newOwner == address(0)) {
            revert Ownable__OwnerZeroAddress();
        }
        emit TransferOwnership(owner, newOwner);
        owner = newOwner;
    }
}

// SPDX-License-Identifier: Unlicense
pragma solidity >=0.8.4;

/// @title IErc20
/// @author Paul Razvan Berg
/// @notice Implementation for the Erc20 standard.
///
/// We have followed general OpenZeppelin guidelines: functions revert instead of returning
/// `false` on failure. This behavior is nonetheless conventional and does not conflict with
/// the with the expectations of Erc20 applications.
///
/// Additionally, an {Approval} event is emitted on calls to {transferFrom}. This allows
/// applications to reconstruct the allowance for all accounts just by listening to said
/// events. Other implementations of the Erc may not emit these events, as it isn't
/// required by the specification.
///
/// Finally, the non-standard {decreaseAllowance} and {increaseAllowance} functions have been
/// added to mitigate the well-known issues around setting allowances.
///
/// @dev Forked from OpenZeppelin
/// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.4.0/contracts/token/ERC20/ERC20.sol
interface IErc20 {
    /// EVENTS ///

    /// @notice Emitted when an approval happens.
    /// @param owner The address of the owner of the tokens.
    /// @param spender The address of the spender.
    /// @param amount The maximum amount that can be spent.
    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /// @notice Emitted when a transfer happens.
    /// @param from The account sending the tokens.
    /// @param to The account receiving the tokens.
    /// @param amount The amount of tokens transferred.
    event Transfer(address indexed from, address indexed to, uint256 amount);

    /// CONSTANT FUNCTIONS ///

    /// @notice Returns the remaining number of tokens that `spender` will be allowed to spend
    /// on behalf of `owner` through {transferFrom}. This is zero by default.
    ///
    /// @dev This value changes when {approve} or {transferFrom} are called.
    function allowance(address owner, address spender) external view returns (uint256);

    /// @notice Returns the amount of tokens owned by `account`.
    function balanceOf(address account) external view returns (uint256);

    /// @notice Returns the number of decimals used to get its user representation.
    function decimals() external view returns (uint8);

    /// @notice Returns the name of the token.
    function name() external view returns (string memory);

    /// @notice Returns the symbol of the token, usually a shorter version of the name.
    function symbol() external view returns (string memory);

    /// @notice Returns the amount of tokens in existence.
    function totalSupply() external view returns (uint256);

    /// NON-CONSTANT FUNCTIONS ///

    /// @notice Sets `amount` as the allowance of `spender` over the caller's tokens.
    ///
    /// @dev Emits an {Approval} event.
    ///
    /// IMPORTANT: Beware that changing an allowance with this method brings the risk that someone may
    /// use both the old and the new allowance by unfortunate transaction ordering. One possible solution
    /// to mitigate this race condition is to first reduce the spender's allowance to 0 and set the desired
    /// value afterwards: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
    ///
    /// Requirements:
    ///
    /// - `spender` cannot be the zero address.
    ///
    /// @return a boolean value indicating whether the operation succeeded.
    function approve(address spender, uint256 amount) external returns (bool);

    /// @notice Atomically decreases the allowance granted to `spender` by the caller.
    ///
    /// @dev Emits an {Approval} event indicating the updated allowance.
    ///
    /// This is an alternative to {approve} that can be used as a mitigation for problems described
    /// in {Erc20Interface-approve}.
    ///
    /// Requirements:
    ///
    /// - `spender` cannot be the zero address.
    /// - `spender` must have allowance for the caller of at least `subtractedAmount`.
    function decreaseAllowance(address spender, uint256 subtractedAmount) external returns (bool);

    /// @notice Atomically increases the allowance granted to `spender` by the caller.
    ///
    /// @dev Emits an {Approval} event indicating the updated allowance.
    ///
    /// This is an alternative to {approve} that can be used as a mitigation for the problems described above.
    ///
    /// Requirements:
    ///
    /// - `spender` cannot be the zero address.
    function increaseAllowance(address spender, uint256 addedAmount) external returns (bool);

    /// @notice Moves `amount` tokens from the caller's account to `recipient`.
    ///
    /// @dev Emits a {Transfer} event.
    ///
    /// Requirements:
    ///
    /// - `recipient` cannot be the zero address.
    /// - The caller must have a balance of at least `amount`.
    ///
    /// @return a boolean value indicating whether the operation succeeded.
    function transfer(address recipient, uint256 amount) external returns (bool);

    /// @notice Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount`
    /// `is then deducted from the caller's allowance.
    ///
    /// @dev Emits a {Transfer} event and an {Approval} event indicating the updated allowance. This is
    /// not required by the Erc. See the note at the beginning of {Erc20}.
    ///
    /// Requirements:
    ///
    /// - `sender` and `recipient` cannot be the zero address.
    /// - `sender` must have a balance of at least `amount`.
    /// - The caller must have approed `sender` to spent at least `amount` tokens.
    ///
    /// @return a boolean value indicating whether the operation succeeded.
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity >=0.8.4;

import "@prb/contracts/token/erc20/IErc20.sol";
import "@prb/contracts/access/IOwnable.sol";

import "../external/chainlink/IAggregatorV3.sol";

/// @title IChainlinkOperator
/// @author Hifi
/// @notice Aggregates the price feeds provided by Chainlink.
interface IChainlinkOperator {
    /// CUSTOM ERRORS ///

    /// @notice Emitted when the decimal precision of the feed is not the same as the expected number.
    error ChainlinkOperator__DecimalsMismatch(string symbol, uint256 decimals);

    /// @notice Emitted when trying to interact with a feed not set yet.
    error ChainlinkOperator__FeedNotSet(string symbol);

    /// @notice Emitted when the price returned by the oracle is less than or equal to zero.
    error ChainlinkOperator__PriceLessThanOrEqualToZero(string symbol);

    /// @notice Emitted when the latest price update timestamp returned by the oracle is too old.
    error ChainlinkOperator__PriceStale(string symbol);

    /// EVENTS ///

    /// @notice Emitted when a feed is deleted.
    /// @param asset The related asset.
    /// @param feed The related feed.
    event DeleteFeed(IErc20 indexed asset, IAggregatorV3 indexed feed);

    /// @notice Emitted when a feed is set.
    /// @param asset The related asset.
    /// @param feed The related feed.
    event SetFeed(IErc20 indexed asset, IAggregatorV3 indexed feed);

    /// @notice Emitted when the Chainlink price staleness threshold is set.
    /// @param oldPriceStalenessThreshold The old Chainlink price staleness threshold.
    /// @param newPriceStalenessThreshold The new Chainlink price staleness threshold.
    event SetPriceStalenessThreshold(uint256 oldPriceStalenessThreshold, uint256 newPriceStalenessThreshold);

    /// STRUCTS ///

    struct Feed {
        IErc20 asset;
        IAggregatorV3 id;
        bool isSet;
    }

    /// CONSTANT FUNCTIONS ///

    /// @notice Gets the official feed for a symbol.
    /// @param symbol The symbol to return the feed for.
    /// @return (address asset, address id, bool isSet).
    function getFeed(string memory symbol)
        external
        view
        returns (
            IErc20,
            IAggregatorV3,
            bool
        );

    /// @notice Gets the official price for a symbol and adjusts it have 18 decimals instead of the
    /// format used by Chainlink, which has 8 decimals.
    ///
    /// @dev Requirements:
    /// - The normalized price cannot overflow.
    ///
    /// @param symbol The Erc20 symbol of the token for which to query the price.
    /// @return The normalized price.
    function getNormalizedPrice(string memory symbol) external view returns (uint256);

    /// @notice Gets the official price for a symbol in the default format used by Chainlink, which
    /// has 8 decimals.
    ///
    /// @dev Requirements:
    ///
    /// - The feed must be set.
    /// - The price returned by the oracle cannot be zero.
    ///
    /// @param symbol The symbol to fetch the price for.
    /// @return The price denominated in USD, with 8 decimals.
    function getPrice(string memory symbol) external view returns (uint256);

    /// @notice Chainlink price precision for USD-quoted data.
    function pricePrecision() external view returns (uint256);

    /// @notice The ratio between normalized precision (1e18) and the Chainlink price precision (1e8).
    function pricePrecisionScalar() external view returns (uint256);

    /// @notice The Chainlink price staleness threshold.
    function priceStalenessThreshold() external view returns (uint256);

    /// NON-CONSTANT FUNCTIONS ///

    /// @notice Deletes a previously set Chainlink price feed.
    ///
    /// @dev Emits a {DeleteFeed} event.
    ///
    /// Requirements:
    ///
    /// - The caller must be the owner.
    /// - The feed must be set already.
    ///
    /// @param symbol The Erc20 symbol of the asset to delete the feed for.
    function deleteFeed(string memory symbol) external;

    /// @notice Sets a Chainlink price feed.
    ///
    /// @dev It is not an error to set a feed twice. Emits a {SetFeed} event.
    ///
    /// Requirements:
    ///
    /// - The caller must be the owner.
    /// - The number of decimals of the feed must be 8.
    ///
    /// @param asset The address of the Erc20 contract for which to get the price.
    /// @param feed The address of the Chainlink price feed contract.
    function setFeed(IErc20 asset, IAggregatorV3 feed) external;

    /// @notice Sets the Chainlink price staleness threshold.
    ///
    /// @dev Emits a {SetPriceStalenessThreshold} event.
    ///
    /// Requirements:
    ///
    /// - The caller must be the owner.
    ///
    /// @param newPriceStalenessThreshold The new Chainlink price staleness threshold.
    function setPriceStalenessThreshold(uint256 newPriceStalenessThreshold) external;
}

// SPDX-License-Identifier: Unlicense
pragma solidity >=0.8.4;

/// @title IOwnable
/// @author Paul Razvan Berg
/// @notice Contract module that 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 {transfer}.
///
/// 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.
///
/// @dev Forked from OpenZeppelin
/// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.4.0/contracts/access/Ownable.sol
interface IOwnable {
    /// EVENTS ///

    /// @notice Emitted when ownership is transferred.
    /// @param oldOwner The address of the old owner.
    /// @param newOwner The address of the new owner.
    event TransferOwnership(address indexed oldOwner, address indexed newOwner);

    /// NON-CONSTANT FUNCTIONS ///

    /// @notice Leaves the contract without owner, so it will not be possible to call `onlyOwner`
    /// functions anymore.
    ///
    /// WARNING: Doing this will leave the contract without an owner, thereby removing any
    /// functionality that is only available to the owner.
    ///
    /// Requirements:
    ///
    /// - The caller must be the owner.
    function _renounceOwnership() external;

    /// @notice Transfers the owner of the contract to a new account (`newOwner`). Can only be
    /// called by the current owner.
    /// @param newOwner The account of the new owner.
    function _transferOwnership(address newOwner) external;

    /// CONSTANT FUNCTIONS ///

    /// @notice The address of the owner account or contract.
    /// @return The address of the owner.
    function owner() external view returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

/// @title IAggregatorV3
/// @author Hifi
/// @dev Forked from Chainlink
/// github.com/smartcontractkit/chainlink/blob/v1.2.0/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol
interface IAggregatorV3 {
    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
        );
}

{
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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