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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "Ownable.sol";
import "IERC20Metadata.sol";

import "ScaledMath.sol";
import "IGenericOracle.sol";

contract GenericOracle is IGenericOracle, Ownable {
    using ScaledMath for uint256;

    event CustomOracleAdded(address token, address oracle);

    mapping(address => IOracle) public customOracles;

    IOracle internal _chainlinkOracle;
    IOracle internal _curveLpOracle;

    function initialize(address curveLpOracle, address chainlinkOracle) external onlyOwner {
        require(address(_curveLpOracle) == address(0), "already initialized");
        _chainlinkOracle = IOracle(chainlinkOracle);
        _curveLpOracle = IOracle(curveLpOracle);
    }

    function isTokenSupported(address token) external view override returns (bool) {
        return
            address(customOracles[token]) != address(0) ||
            _chainlinkOracle.isTokenSupported(token) ||
            _curveLpOracle.isTokenSupported(token);
    }

    function getOracle(address token) public view virtual returns (IOracle) {
        if (address(customOracles[token]) != address(0)) {
            return customOracles[token];
        }
        if (_chainlinkOracle.isTokenSupported(token)) {
            return _chainlinkOracle;
        }
        return _curveLpOracle;
    }

    function getUSDPrice(address token) public view virtual returns (uint256) {
        return getOracle(token).getUSDPrice(token);
    }

    function setCustomOracle(address token, address oracle) external onlyOwner {
        customOracles[token] = IOracle(oracle);
        emit CustomOracleAdded(token, oracle);
    }

    function curveLpToUnderlying(
        address curveLpToken,
        address underlying,
        uint256 curveLpAmount
    ) external view returns (uint256) {
        return
            curveLpToUnderlying(curveLpToken, underlying, curveLpAmount, getUSDPrice(underlying));
    }

    function curveLpToUnderlying(
        address curveLpToken,
        address underlying,
        uint256 curveLpAmount,
        uint256 underlyingPrice
    ) public view returns (uint256) {
        return
            curveLpAmount.mulDown(getUSDPrice(curveLpToken)).divDown(underlyingPrice).convertScale(
                18,
                IERC20Metadata(underlying).decimals()
            );
    }

    function underlyingToCurveLp(
        address underlying,
        address curveLpToken,
        uint256 underlyingAmount
    ) external view returns (uint256) {
        return
            underlyingAmount
                .mulDown(getUSDPrice(address(underlying)))
                .divDown(getUSDPrice(curveLpToken))
                .convertScale(IERC20Metadata(underlying).decimals(), 18);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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 v4.4.1 (utils/Context.sol)

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: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
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 v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount) external returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

library ScaledMath {
    uint256 internal constant DECIMALS = 18;
    uint256 internal constant ONE = 10 ** DECIMALS;

    function mulDown(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a * b) / ONE;
    }

    function mulDown(uint256 a, uint256 b, uint256 decimals) internal pure returns (uint256) {
        return (a * b) / (10 ** decimals);
    }

    function divDown(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a * ONE) / b;
    }

    function divDown(uint256 a, uint256 b, uint256 decimals) internal pure returns (uint256) {
        return (a * 10 ** decimals) / b;
    }

    function divUp(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        return ((a * ONE) - 1) / b + 1;
    }

    function mulDown(int256 a, int256 b) internal pure returns (int256) {
        return (a * b) / int256(ONE);
    }

    function mulDownUint128(uint128 a, uint128 b) internal pure returns (uint128) {
        return (a * b) / uint128(ONE);
    }

    function mulDown(int256 a, int256 b, uint256 decimals) internal pure returns (int256) {
        return (a * b) / int256(10 ** decimals);
    }

    function divDown(int256 a, int256 b) internal pure returns (int256) {
        return (a * int256(ONE)) / b;
    }

    function divDownUint128(uint128 a, uint128 b) internal pure returns (uint128) {
        return (a * uint128(ONE)) / b;
    }

    function divDown(int256 a, int256 b, uint256 decimals) internal pure returns (int256) {
        return (a * int256(10 ** decimals)) / b;
    }

    function convertScale(
        uint256 a,
        uint8 fromDecimals,
        uint8 toDecimals
    ) internal pure returns (uint256) {
        if (fromDecimals == toDecimals) return a;
        if (fromDecimals > toDecimals) return downscale(a, fromDecimals, toDecimals);
        return upscale(a, fromDecimals, toDecimals);
    }

    function convertScale(
        int256 a,
        uint8 fromDecimals,
        uint8 toDecimals
    ) internal pure returns (int256) {
        if (fromDecimals == toDecimals) return a;
        if (fromDecimals > toDecimals) return downscale(a, fromDecimals, toDecimals);
        return upscale(a, fromDecimals, toDecimals);
    }

    function upscale(
        uint256 a,
        uint8 fromDecimals,
        uint8 toDecimals
    ) internal pure returns (uint256) {
        return a * (10 ** (toDecimals - fromDecimals));
    }

    function downscale(
        uint256 a,
        uint8 fromDecimals,
        uint8 toDecimals
    ) internal pure returns (uint256) {
        return a / (10 ** (fromDecimals - toDecimals));
    }

    function upscale(
        int256 a,
        uint8 fromDecimals,
        uint8 toDecimals
    ) internal pure returns (int256) {
        return a * int256(10 ** (toDecimals - fromDecimals));
    }

    function downscale(
        int256 a,
        uint8 fromDecimals,
        uint8 toDecimals
    ) internal pure returns (int256) {
        return a / int256(10 ** (fromDecimals - toDecimals));
    }

    function intPow(uint256 a, uint256 n) internal pure returns (uint256) {
        uint256 result = ONE;
        for (uint256 i; i < n; ) {
            result = mulDown(result, a);
            unchecked {
                ++i;
            }
        }
        return result;
    }

    function absSub(uint256 a, uint256 b) internal pure returns (uint256) {
        unchecked {
            return a >= b ? a - b : b - a;
        }
    }

    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a <= b ? a : b;
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

import "IOracle.sol";

interface IGenericOracle is IOracle {
    /// @notice returns the oracle to be used to price `token`
    function getOracle(address token) external view returns (IOracle);

    /// @notice converts the price of an LP token to the given underlying
    function curveLpToUnderlying(
        address curveLpToken,
        address underlying,
        uint256 curveLpAmount
    ) external view returns (uint256);

    /// @notice same as above but avoids fetching the underlying price again
    function curveLpToUnderlying(
        address curveLpToken,
        address underlying,
        uint256 curveLpAmount,
        uint256 underlyingPrice
    ) external view returns (uint256);

    /// @notice converts the price an underlying asset to a given Curve LP token
    function underlyingToCurveLp(
        address underlying,
        address curveLpToken,
        uint256 underlyingAmount
    ) external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.17;

interface IOracle {
    event TokenUpdated(address indexed token, address feed, uint256 maxDelay, bool isEthPrice);

    /// @notice returns the price in USD of symbol.
    function getUSDPrice(address token) external view returns (uint256);

    /// @notice returns if the given token is supported for pricing.
    function isTokenSupported(address token) external view returns (bool);
}

{
  "evmVersion": "london",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "libraries": {
    "GenericOracle.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"token","type":"address"},{"indexed":false,"internalType":"address","name":"oracle","type":"address"}],"name":"CustomOracleAdded","type":"event"},{"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":"address","name":"token","type":"address"},{"indexed":false,"internalType":"address","name":"feed","type":"address"},{"indexed":false,"internalType":"uint256","name":"maxDelay","type":"uint256"},{"indexed":false,"internalType":"bool","name":"isEthPrice","type":"bool"}],"name":"TokenUpdated","type":"event"},{"inputs":[{"internalType":"address","name":"curveLpToken","type":"address"},{"internalType":"address","name":"underlying","type":"address"},{"internalType":"uint256","name":"curveLpAmount","type":"uint256"}],"name":"curveLpToUnderlying","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"curveLpToken","type":"address"},{"internalType":"address","name":"underlying","type":"address"},{"internalType":"uint256","name":"curveLpAmount","type":"uint256"},{"internalType":"uint256","name":"underlyingPrice","type":"uint256"}],"name":"curveLpToUnderlying","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"customOracles","outputs":[{"internalType":"contract IOracle","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"getOracle","outputs":[{"internalType":"contract IOracle","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"getUSDPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"curveLpOracle","type":"address"},{"internalType":"address","name":"chainlinkOracle","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"isTokenSupported","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"oracle","type":"address"}],"name":"setCustomOracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"underlying","type":"address"},{"internalType":"address","name":"curveLpToken","type":"address"},{"internalType":"uint256","name":"underlyingAmount","type":"uint256"}],"name":"underlyingToCurveLp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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