Contract 0x6ff6a0982c68f49586360f5bef302ef8ca837734

/**
 *Submitted for verification at celoscan.io on 2023-04-28
*/

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.6.0) (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);
}

// File: contracts/strategies/IStrategy.sol

pragma solidity 0.8.7;

interface IStrategy {
    function invest(address _inboundCurrency, uint256 _minAmount) external payable;

    function earlyWithdraw(address _inboundCurrency, uint256 _amount, uint256 _minAmount) external;

    function redeem(
        address _inboundCurrency,
        uint256 _amount,
        uint256 _minAmount,
        bool disableRewardTokenClaim
    ) external;

    function getTotalAmount() external view returns (uint256);

    function getLPTokenAmount(uint256 _amount) external view returns (uint256);

    function getFee() external view returns (uint256);

    function getNetDepositAmount(uint256 _amount) external view returns (uint256);

    function getAccumulatedRewardTokenAmounts(bool disableRewardTokenClaim) external returns (uint256[] memory);

    function getRewardTokens() external view returns (IERC20[] memory);

    function getUnderlyingAsset() external view returns (address);

    function strategyOwner() external view returns (address);
}

// File: @openzeppelin/contracts/utils/Context.sol


// 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;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @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 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 {
        _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);
    }
}

// File: contracts/strategies/NoExternalStrategy.sol



pragma solidity 0.8.7;



//*********************************************************************//
// --------------------------- custom errors ------------------------- //
//*********************************************************************//
error INVALID_REWARD_TOKEN();
error TOKEN_TRANSFER_FAILURE();
error TRANSACTIONAL_TOKEN_TRANSFER_FAILURE();

/**
  @notice
  This strategy holds the deposited funds without transferring them to an external protocol.
  @author Francis Odisi & Viraz Malhotra.
*/
contract NoExternalStrategy is Ownable, IStrategy {
    /// @notice inbound token (deposit token) address
    IERC20 public inboundToken;

    /// @notice reward token address
    IERC20[] public rewardTokens;

    //*********************************************************************//
    // ------------------------- external views -------------------------- //
    //*********************************************************************//

    /** 
    @notice
    Get strategy owner address.
    @return Strategy owner.
    */
    function strategyOwner() external view override returns (address) {
        return super.owner();
    }

    /** 
    @notice
    Returns the total accumulated amount (i.e., principal + interest) stored in curve.
    Intended for usage by external clients and in case of variable deposit pools.
    @return Total accumulated amount.
    */
    function getTotalAmount() external view override returns (uint256) {
        return address(inboundToken) == address(0) ? address(this).balance : inboundToken.balanceOf(address(this));
    }

    /** 
    @notice
    Get the expected net deposit amount (amount minus slippage) for a given amount. Used only for AMM strategies.
    @return net amount.
    */
    function getNetDepositAmount(uint256 _amount) external pure override returns (uint256) {
        return _amount;
    }

    /** 
    @notice
    Returns the underlying token address.
    @return Returns the underlying inbound (deposit) token address.
    */
    function getUnderlyingAsset() external view override returns (address) {
        return address(inboundToken);
    }

    /** 
    @notice
    Returns the instances of the reward tokens
    */
    function getRewardTokens() external view override returns (IERC20[] memory) {
        return rewardTokens;
    }

    /** 
    @notice
    Returns the lp token amount received (for amm strategies)
    */
    function getLPTokenAmount(uint256 _amount) external pure override returns (uint256) {
        return _amount;
    }

    /** 
    @notice
    Returns the fee (for amm strategies)
    */
    function getFee() external pure override returns (uint256) {
        return 0;
    }

    //*********************************************************************//
    // -------------------------- constructor ---------------------------- //
    //*********************************************************************//

    /** 
    @param _inboundCurrency inbound currency address.
    */
    constructor(address _inboundCurrency, IERC20[] memory _rewardTokens) {
        inboundToken = IERC20(_inboundCurrency);
        uint256 numRewards = _rewardTokens.length;
        for (uint256 i = 0; i < numRewards; ) {
            if (address(_rewardTokens[i]) == address(0)) {
                revert INVALID_REWARD_TOKEN();
            }
            unchecked {
                ++i;
            }
        }
        rewardTokens = _rewardTokens;
    }

    //*********************************************************************//
    // ------------------------- internal method -------------------------- //
    //*********************************************************************//
    /** 
    @notice
    Transfers inbound token amount back to pool.
    @param _inboundCurrency Address of the inbound token.
    @param _amount transfer amount
    */
    function _transferInboundTokenToPool(address _inboundCurrency, uint256 _amount) internal {
        if (_inboundCurrency == address(0)) {
            (bool success, ) = msg.sender.call{ value: _amount }("");
            if (!success) {
                revert TRANSACTIONAL_TOKEN_TRANSFER_FAILURE();
            }
        } else {
            bool success = IERC20(_inboundCurrency).transfer(msg.sender, _amount);
            if (!success) {
                revert TOKEN_TRANSFER_FAILURE();
            }
        }
    }

    /**
    @notice
    Deposits funds into this contract.
    @param _inboundCurrency Address of the inbound token.
    @param _minAmount Used for aam strategies, since every strategy overrides from the same strategy interface hence it is defined here.
    _minAmount isn't needed in this strategy but since all strategies override from the same interface and the amm strategies need it hence it is used here.
    */
    function invest(address _inboundCurrency, uint256 _minAmount) external payable override onlyOwner {}

    /**
    @notice
    Withdraws funds from this strategy in case of an early withdrawal.
    @param _inboundCurrency Address of the inbound token.
    @param _amount Amount to withdraw.
    @param _minAmount Used for aam strategies, since every strategy overrides from the same strategy interface hence it is defined here.
    _minAmount isn't needed in this strategy but since all strategies override from the same interface and the amm strategies need it hence it is used here.
    */
    function earlyWithdraw(address _inboundCurrency, uint256 _amount, uint256 _minAmount) external override onlyOwner {
        _transferInboundTokenToPool(_inboundCurrency, _amount);
    }

    /**
    @notice
    Redeems funds from this strategy when the waiting round for the good ghosting pool is over.
    @param _inboundCurrency Address of the inbound token.
    @param _amount Amount to withdraw.
    @param _minAmount Used for aam strategies, since every strategy overrides from the same strategy interface hence it is defined here.
    _minAmount isn't needed in this strategy but since all strategies override from the same interface and the amm strategies need it hence it is used here.
    @param disableRewardTokenClaim Reward claim disable flag.
    */
    function redeem(
        address _inboundCurrency,
        uint256 _amount,
        uint256 _minAmount,
        bool disableRewardTokenClaim
    ) external override onlyOwner {
        uint256 _balance = _inboundCurrency == address(0)
            ? address(this).balance
            : IERC20(_inboundCurrency).balanceOf(address(this));
        // safety check since funds don't get transferred to a extrnal protocol
        if (_amount > _balance) {
            _amount = _balance;
        }

        _transferInboundTokenToPool(_inboundCurrency, _amount);

        if (!disableRewardTokenClaim) {
            // avoid multiple SLOADS
            IERC20[] memory _rewardTokens = rewardTokens;
            uint256 numRewards = _rewardTokens.length;
            for (uint256 i = 0; i < numRewards; ) {
                // safety check since funds don't get transferred to a extrnal protocol
                if (_rewardTokens[i].balanceOf(address(this)) != 0) {
                    bool success = _rewardTokens[i].transfer(msg.sender, _rewardTokens[i].balanceOf(address(this)));
                    if (!success) {
                        revert TOKEN_TRANSFER_FAILURE();
                    }
                }
                unchecked {
                    ++i;
                }
            }
        }
    }

    /**
    @notice
    Returns total accumulated reward token amount.
    @param disableRewardTokenClaim Reward claim disable flag.
    */
    function getAccumulatedRewardTokenAmounts(
        bool disableRewardTokenClaim
    ) external view override returns (uint256[] memory) {
        // avoid multiple SLOADS
        IERC20[] memory _rewardTokens = rewardTokens;
        uint256 numRewards = _rewardTokens.length;
        uint256[] memory amounts = new uint256[](numRewards);
        for (uint256 i = 0; i < numRewards; ) {
            amounts[i] = _rewardTokens[i].balanceOf(address(this));
            unchecked {
                ++i;
            }
        }
        return amounts;
    }
}

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