Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

import {IERC20Metadata} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

import {IVaultPriceOracle, AggregatorV3Interface} from "../interfaces/VaultExternalInterfaces.sol";

contract ChainlinkUsdPriceOracle is IVaultPriceOracle, Ownable {
    struct FeedConfig {
        AggregatorV3Interface agg;
        uint8 aggDecimals;
        uint8 tokenDecimals;
        uint256 stalePeriod; // per-asset max age in seconds
    }

    mapping(address => FeedConfig) public feeds;

    error NoFeedConfigured(address asset);
    error BadAnswer(address asset);
    error StalePrice(address asset);

    event FeedSet(
        address indexed asset,
        address indexed aggregator,
        uint8 aggDecimals,
        uint8 tokenDecimals,
        uint256 stalePeriod
    );

    constructor(
        address initialOwner,
        address[] memory assets,
        address[] memory aggregators,
        uint256[] memory stalePeriods
    ) Ownable(initialOwner) {
        require(
            assets.length == aggregators.length &&
                assets.length == stalePeriods.length,
            "length_mismatch"
        );

        for (uint256 i = 0; i < assets.length; ++i) {
            _setFeedInternal(assets[i], aggregators[i], stalePeriods[i]);
        }
    }

    /// @notice Add or update a feed config. Restricted to owner.
    function setFeed(
        address asset,
        address aggregator,
        uint256 stalePeriodSeconds
    ) external onlyOwner {
        _setFeedInternal(asset, aggregator, stalePeriodSeconds);
    }

    function _setFeedInternal(
        address asset,
        address aggregator,
        uint256 stalePeriodSeconds
    ) internal {
        require(asset != address(0) && aggregator != address(0), "zero_address");
        require(stalePeriodSeconds > 0, "stalePeriod=0");

        uint8 tokenDec = IERC20Metadata(asset).decimals();
        uint8 aggDec = AggregatorV3Interface(aggregator).decimals();

        feeds[asset] = FeedConfig({
            agg: AggregatorV3Interface(aggregator),
            aggDecimals: aggDec,
            tokenDecimals: tokenDec,
            stalePeriod: stalePeriodSeconds
        });

        emit FeedSet(asset, aggregator, aggDec, tokenDec, stalePeriodSeconds);
    }

    function _latestPrice1e18(address asset) internal view returns (uint256) {
        FeedConfig memory cfg = feeds[asset];
        if (address(cfg.agg) == address(0)) revert NoFeedConfigured(asset);

        (
            uint80 roundId,
            int256 answer,
            ,
            uint256 updatedAt,
            uint80 answeredInRound
        ) = cfg.agg.latestRoundData();

        if (answer <= 0) revert BadAnswer(asset);
        if (answeredInRound < roundId) revert BadAnswer(asset);
        if (block.timestamp - updatedAt > cfg.stalePeriod) revert StalePrice(asset);

        uint256 raw = uint256(answer);
        uint8 d = cfg.aggDecimals;

        // Normalize to 1e18
        if (d >= 18) {
            return raw / 10 ** (d - 18);
        } else {
            return raw * 10 ** (18 - d);
        }
    }

    /// @inheritdoc IVaultPriceOracle
    function priceInUsd(address asset) public view override returns (uint256) {
        return _latestPrice1e18(asset); // USD 1e18 per 1 full token
    }

    /// @inheritdoc IVaultPriceOracle
    function valueInUsd(address asset, uint256 amount)
        public
        view
        override
        returns (uint256)
    {
        if (amount == 0) return 0;

        FeedConfig memory cfg = feeds[asset];
        if (address(cfg.agg) == address(0)) revert NoFeedConfigured(asset);

        uint256 price = _latestPrice1e18(asset); // 1e18 per 1 token

        // amount [tokenDecimals], price [1e18 per 1 token] =>
        // valueUsd = amount * price / 10^tokenDecimals
        return (amount * price) / 10 ** cfg.tokenDecimals;
    }

    /// @inheritdoc IVaultPriceOracle
    function valueInCollateral(
        address asset,
        address collateralAsset,
        uint256 amount
    ) public view override returns (uint256) {
        if (amount == 0) return 0;

        uint256 valueUsd = valueInUsd(asset, amount); // 1e18

        FeedConfig memory collCfg = feeds[collateralAsset];
        if (address(collCfg.agg) == address(0)) revert NoFeedConfigured(collateralAsset);

        uint256 collPrice = _latestPrice1e18(collateralAsset); // 1e18

        // valueUsd [1e18] = amountCollat * collPrice / 10^collDecimals
        // => amountCollat = valueUsd * 10^collDecimals / collPrice
        return (valueUsd * 10 ** collCfg.tokenDecimals) / collPrice;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IERC20Metadata} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

// ==========================================================
// Core external interfaces shared across contracts
// ==========================================================

/// @dev Minimal Aave V3 Pool interface (supply + withdraw + borrow + repay).
interface IAavePool {
    function supply(
        address asset,
        uint256 amount,
        address onBehalfOf,
        uint16 referralCode
    ) external;

    function withdraw(
        address asset,
        uint256 amount,
        address to
    ) external returns (uint256);

    function borrow(
        address asset,
        uint256 amount,
        uint256 interestRateMode, // 1 = stable, 2 = variable (Aave v3)
        uint16 referralCode,
        address onBehalfOf
    ) external;

    function repay(
        address asset,
        uint256 amount,
        uint256 interestRateMode,
        address onBehalfOf
    ) external returns (uint256);
}

/// @dev Minimal aToken interface (just ERC20).
interface IAToken is IERC20 {}

/// @dev Aave variable debt token (tracks principal + interest).
interface IVariableDebtToken is IERC20 {}

/// @dev Minimal Uniswap V3-style router interface.
interface ISwapRouter {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    function exactInputSingle(ExactInputSingleParams calldata params)
        external
        payable
        returns (uint256 amountOut);
}

// ==========================================================
// Oracle interface used by vault
// ==========================================================

/// @dev Price oracle interface used by the vault.
interface IVaultPriceOracle {
    /// @notice Value of `amount` of `asset` in USD, scaled by 1e18.
    function valueInUsd(address asset, uint256 amount) external view returns (uint256);

    /// @notice Value of `amount` of `asset` expressed in `collateralAsset` units.
    ///         Must return a value in the exact decimals of `collateralAsset`.
    function valueInCollateral(
        address asset,
        address collateralAsset,
        uint256 amount
    ) external view returns (uint256);

    /// @notice Price of 1 full token of `asset` in USD, scaled by 1e18.
    function priceInUsd(address asset) external view returns (uint256);
}

// ==========================================================
// Chainlink aggregator interface
// ==========================================================

interface AggregatorV3Interface {
    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );

    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity >=0.6.2;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

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

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * 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
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}