Contract

Contract Source Code (Solidity)

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Outline

• interface IPlatformIntegration
•    - function deposit(
•    - function withdraw(
•    - function withdraw(
•    - function withdrawRaw(
•    - function checkBalance(address _bAsset ...
• interface IAlchemixStakingPools
•    - function claim(uint256 _poolId)
•    - function deposit(uint256 _poolId, uin ...
•    - function exit(uint256 _poolId)
•    - function getStakeTotalDeposited(addre ...
•    - function getStakeTotalUnclaimed(addre ...
•    - function getPoolRewardRate(uint256 _p ...
•    - function getPoolRewardWeight(uint256 ...
•    - function getPoolToken(uint256 _poolId ...
•    - function reward()
•    - function tokenPoolIds(address _token)
•    - function withdraw(uint256 _poolId, ui ...
•  contract ModuleKeys
• interface INexus
•    - function governor()
•    - function getModule(bytes32 key)
•    - function proposeModule(bytes32 _key, ...
•    - function cancelProposedModule(bytes32 ...
•    - function acceptProposedModule(bytes32 ...
•    - function acceptProposedModules(bytes3 ...
•    - function requestLockModule(bytes32 _k ...
•    - function cancelLockModule(bytes32 _ke ...
•    - function lockModule(bytes32 _key)
•    - function _onlyGovernor()
•    - function _governor()
•    - function _governance()
•    - function _savingsManager()
•    - function _recollateraliser()
•    - function _liquidator()
•    - function _proxyAdmin()
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(address target, ...
•    - function functionCallWithValue(addres ...
•    - function functionCallWithValue(addres ...
•    - function functionStaticCall(address t ...
•    - function functionStaticCall(address t ...
•    - function functionDelegateCall(address ...
•    - function functionDelegateCall(address ...
•    - function _verifyCallResult(bool succe ...
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function safeIncreaseAllowance(IERC20 ...
•    - function safeDecreaseAllowance(IERC20 ...
•    - function _callOptionalReturn(IERC20 t ...
• library MassetHelpers
•    - function transferReturnBalance(
•    - function safeInfiniteApprove(address ...
•  contract AlchemixIntegration is *
•    - function initialize()
•    - function reapproveContracts()
•    - function _approveContracts()
•    - function deposit(
•    - function withdraw(
•    - function withdraw(
•    - function _withdraw(
•    - function withdrawRaw(
•    - function checkBalance(address _bAsset ...
•    - function claimRewards()
•    - function _min(uint256 x, uint256 y)

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/**
 *Submitted for verification at Etherscan.io on 2021-07-12
*/

pragma solidity 0.8.2;


interface IPlatformIntegration {
    /**
     * @dev Deposit the given bAsset to Lending platform
     * @param _bAsset bAsset address
     * @param _amount Amount to deposit
     */
    function deposit(
        address _bAsset,
        uint256 _amount,
        bool isTokenFeeCharged
    ) external returns (uint256 quantityDeposited);

    /**
     * @dev Withdraw given bAsset from Lending platform
     */
    function withdraw(
        address _receiver,
        address _bAsset,
        uint256 _amount,
        bool _hasTxFee
    ) external;

    /**
     * @dev Withdraw given bAsset from Lending platform
     */
    function withdraw(
        address _receiver,
        address _bAsset,
        uint256 _amount,
        uint256 _totalAmount,
        bool _hasTxFee
    ) external;

    /**
     * @dev Withdraw given bAsset from the cache
     */
    function withdrawRaw(
        address _receiver,
        address _bAsset,
        uint256 _amount
    ) external;

    /**
     * @dev Returns the current balance of the given bAsset
     */
    function checkBalance(address _bAsset) external returns (uint256 balance);
}

interface IAlchemixStakingPools {
    function claim(uint256 _poolId) external;

    function deposit(uint256 _poolId, uint256 _depositAmount) external;

    function exit(uint256 _poolId) external;

    function getStakeTotalDeposited(address _account, uint256 _poolId)
        external
        view
        returns (uint256);

    function getStakeTotalUnclaimed(address _account, uint256 _poolId)
        external
        view
        returns (uint256);

    function getPoolRewardRate(uint256 _poolId) external view returns (uint256);

    function getPoolRewardWeight(uint256 _poolId) external view returns (uint256);

    function getPoolToken(uint256 _poolId) external view returns (address);

    function reward() external view returns (address);

    function tokenPoolIds(address _token) external view returns (uint256);

    function withdraw(uint256 _poolId, uint256 _withdrawAmount) external;
}

contract ModuleKeys {
    // Governance
    // ===========
    // keccak256("Governance");
    bytes32 internal constant KEY_GOVERNANCE =
        0x9409903de1e6fd852dfc61c9dacb48196c48535b60e25abf92acc92dd689078d;
    //keccak256("Staking");
    bytes32 internal constant KEY_STAKING =
        0x1df41cd916959d1163dc8f0671a666ea8a3e434c13e40faef527133b5d167034;
    //keccak256("ProxyAdmin");
    bytes32 internal constant KEY_PROXY_ADMIN =
        0x96ed0203eb7e975a4cbcaa23951943fa35c5d8288117d50c12b3d48b0fab48d1;

    // mStable
    // =======
    // keccak256("OracleHub");
    bytes32 internal constant KEY_ORACLE_HUB =
        0x8ae3a082c61a7379e2280f3356a5131507d9829d222d853bfa7c9fe1200dd040;
    // keccak256("Manager");
    bytes32 internal constant KEY_MANAGER =
        0x6d439300980e333f0256d64be2c9f67e86f4493ce25f82498d6db7f4be3d9e6f;
    //keccak256("Recollateraliser");
    bytes32 internal constant KEY_RECOLLATERALISER =
        0x39e3ed1fc335ce346a8cbe3e64dd525cf22b37f1e2104a755e761c3c1eb4734f;
    //keccak256("MetaToken");
    bytes32 internal constant KEY_META_TOKEN =
        0xea7469b14936af748ee93c53b2fe510b9928edbdccac3963321efca7eb1a57a2;
    // keccak256("SavingsManager");
    bytes32 internal constant KEY_SAVINGS_MANAGER =
        0x12fe936c77a1e196473c4314f3bed8eeac1d757b319abb85bdda70df35511bf1;
    // keccak256("Liquidator");
    bytes32 internal constant KEY_LIQUIDATOR =
        0x1e9cb14d7560734a61fa5ff9273953e971ff3cd9283c03d8346e3264617933d4;
    // keccak256("InterestValidator");
    bytes32 internal constant KEY_INTEREST_VALIDATOR =
        0xc10a28f028c7f7282a03c90608e38a4a646e136e614e4b07d119280c5f7f839f;
}

interface INexus {
    function governor() external view returns (address);

    function getModule(bytes32 key) external view returns (address);

    function proposeModule(bytes32 _key, address _addr) external;

    function cancelProposedModule(bytes32 _key) external;

    function acceptProposedModule(bytes32 _key) external;

    function acceptProposedModules(bytes32[] calldata _keys) external;

    function requestLockModule(bytes32 _key) external;

    function cancelLockModule(bytes32 _key) external;

    function lockModule(bytes32 _key) external;
}

abstract contract ImmutableModule is ModuleKeys {
    INexus public immutable nexus;

    /**
     * @dev Initialization function for upgradable proxy contracts
     * @param _nexus Nexus contract address
     */
    constructor(address _nexus) {
        require(_nexus != address(0), "Nexus address is zero");
        nexus = INexus(_nexus);
    }

    /**
     * @dev Modifier to allow function calls only from the Governor.
     */
    modifier onlyGovernor() {
        _onlyGovernor();
        _;
    }

    function _onlyGovernor() internal view {
        require(msg.sender == _governor(), "Only governor can execute");
    }

    /**
     * @dev Modifier to allow function calls only from the Governance.
     *      Governance is either Governor address or Governance address.
     */
    modifier onlyGovernance() {
        require(
            msg.sender == _governor() || msg.sender == _governance(),
            "Only governance can execute"
        );
        _;
    }

    /**
     * @dev Returns Governor address from the Nexus
     * @return Address of Governor Contract
     */
    function _governor() internal view returns (address) {
        return nexus.governor();
    }

    /**
     * @dev Returns Governance Module address from the Nexus
     * @return Address of the Governance (Phase 2)
     */
    function _governance() internal view returns (address) {
        return nexus.getModule(KEY_GOVERNANCE);
    }

    /**
     * @dev Return SavingsManager Module address from the Nexus
     * @return Address of the SavingsManager Module contract
     */
    function _savingsManager() internal view returns (address) {
        return nexus.getModule(KEY_SAVINGS_MANAGER);
    }

    /**
     * @dev Return Recollateraliser Module address from the Nexus
     * @return  Address of the Recollateraliser Module contract (Phase 2)
     */
    function _recollateraliser() internal view returns (address) {
        return nexus.getModule(KEY_RECOLLATERALISER);
    }

    /**
     * @dev Return Recollateraliser Module address from the Nexus
     * @return  Address of the Recollateraliser Module contract (Phase 2)
     */
    function _liquidator() internal view returns (address) {
        return nexus.getModule(KEY_LIQUIDATOR);
    }

    /**
     * @dev Return ProxyAdmin Module address from the Nexus
     * @return Address of the ProxyAdmin Module contract
     */
    function _proxyAdmin() internal view returns (address) {
        return nexus.getModule(KEY_PROXY_ADMIN);
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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 Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

library SafeERC20 {
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

library MassetHelpers {
    using SafeERC20 for IERC20;

    function transferReturnBalance(
        address _sender,
        address _recipient,
        address _bAsset,
        uint256 _qty
    ) internal returns (uint256 receivedQty, uint256 recipientBalance) {
        uint256 balBefore = IERC20(_bAsset).balanceOf(_recipient);
        IERC20(_bAsset).safeTransferFrom(_sender, _recipient, _qty);
        recipientBalance = IERC20(_bAsset).balanceOf(_recipient);
        receivedQty = recipientBalance - balBefore;
    }

    function safeInfiniteApprove(address _asset, address _spender) internal {
        IERC20(_asset).safeApprove(_spender, 0);
        IERC20(_asset).safeApprove(_spender, 2**256 - 1);
    }
}

abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

abstract contract Initializable {

    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
/**
 * @title   AlchemixIntegration
 * @author  mStable
 * @notice  A simple connection to farm ALCX rewards with the Alchemix alUSD pool
 * @dev     VERSION: 1.0
 *          DATE:    2021-07-02
 */
contract AlchemixIntegration is
    IPlatformIntegration,
    Initializable,
    ImmutableModule,
    ReentrancyGuard
{
    using SafeERC20 for IERC20;

    event Deposit(address indexed _bAsset, address _pToken, uint256 _amount);
    event Withdrawal(address indexed _bAsset, address _pToken, uint256 _amount);
    event PlatformWithdrawal(
        address indexed bAsset,
        address pToken,
        uint256 totalAmount,
        uint256 userAmount
    );
    event RewardsClaimed();

    /// @notice mAsset or Feeder Pool using the integration. eg fPmUSD/alUSD
    /// @dev LP has write access
    address public immutable lpAddress;
    /// @notice token the staking rewards are accrued and claimed in.
    address public immutable rewardToken;
    /// @notice Alchemix's StakingPools contract
    IAlchemixStakingPools public immutable stakingPools;
    /// @notice base asset that is integrated to Alchemix staking pool. eg alUSD
    address public immutable bAsset;
    /// @notice Alchemix pool identifier for bAsset deposits. eg pool id 0 for alUSD
    uint256 public immutable poolId;

    /**
     * @dev Modifier to allow function calls only from the Governor.
     */
    modifier onlyLP() {
        require(msg.sender == lpAddress, "Only the LP can execute");
        _;
    }

    /**
     * @param _nexus            Address of the Nexus
     * @param _lp               Address of liquidity provider. eg mAsset or feeder pool
     * @param _rewardToken      Reward token, if any. eg ALCX
     * @param _stakingPools     Alchemix StakingPools contract address
     * @param _bAsset           base asset to be deposited to Alchemix's staking pool. eg alUSD
     */
    constructor(
        address _nexus,
        address _lp,
        address _rewardToken,
        address _stakingPools,
        address _bAsset
    ) ImmutableModule(_nexus) {
        require(_lp != address(0), "Invalid LP address");
        require(_rewardToken != address(0), "Invalid reward token");
        require(_stakingPools != address(0), "Invalid staking pools");
        require(_bAsset != address(0), "Invalid bAsset address");

        lpAddress = _lp;
        rewardToken = _rewardToken;
        stakingPools = IAlchemixStakingPools(_stakingPools);
        bAsset = _bAsset;

        uint256 offsetPoolId = IAlchemixStakingPools(_stakingPools).tokenPoolIds(_bAsset);
        require(offsetPoolId >= 1, "bAsset can not be farmed");
        // Take one off the poolId
        poolId = offsetPoolId - 1;
    }

    /**
     * @dev Approve the spending of the bAsset by Alchemix's StakingPools contract,
     *      and the spending of the reward token by mStable's Liquidator contract
     */
    function initialize() public initializer {
        _approveContracts();
    }

    /***************************************
                    ADMIN
    ****************************************/

    /**
     * @dev Re-approve the spending of the bAsset by Alchemix's StakingPools contract,
     *      and the spending of the reward token by mStable's Liquidator contract
     *      if for some reason is it necessary. Only callable through Governance.
     */
    function reapproveContracts() external onlyGovernor {
        _approveContracts();
    }

    function _approveContracts() internal {
        // Approve Alchemix staking pools contract to transfer bAssets for deposits.
        MassetHelpers.safeInfiniteApprove(bAsset, address(stakingPools));

        // Approve Liquidator to transfer reward token when claiming rewards.
        address liquidator = nexus.getModule(keccak256("Liquidator"));
        require(liquidator != address(0), "Liquidator address is zero");

        MassetHelpers.safeInfiniteApprove(rewardToken, liquidator);
    }

    /***************************************
                    CORE
    ****************************************/

    /**
     * @notice Deposit a quantity of bAsset into the platform. Credited cTokens
     *      remain here in the vault. Can only be called by whitelisted addresses
     *      (mAsset and corresponding BasketManager)
     * @param _bAsset              Address for the bAsset
     * @param _amount              Units of bAsset to deposit
     * @param isTokenFeeCharged    Flag that signals if an xfer fee is charged on bAsset
     * @return quantityDeposited   Quantity of bAsset that entered the platform
     */
    function deposit(
        address _bAsset,
        uint256 _amount,
        bool isTokenFeeCharged
    ) external override onlyLP nonReentrant returns (uint256 quantityDeposited) {
        require(_amount > 0, "Must deposit something");
        require(_bAsset == bAsset, "Invalid bAsset");

        quantityDeposited = _amount;

        if (isTokenFeeCharged) {
            // If we charge a fee, account for it
            uint256 prevBal = this.checkBalance(_bAsset);
            stakingPools.deposit(poolId, _amount);
            uint256 newBal = this.checkBalance(_bAsset);
            quantityDeposited = _min(quantityDeposited, newBal - prevBal);
        } else {
            // Else just deposit the amount
            stakingPools.deposit(poolId, _amount);
        }

        emit Deposit(_bAsset, address(stakingPools), quantityDeposited);
    }

    /**
     * @notice Withdraw a quantity of bAsset from Alchemix
     * @param _receiver     Address to which the withdrawn bAsset should be sent
     * @param _bAsset       Address of the bAsset
     * @param _amount       Units of bAsset to withdraw
     * @param _hasTxFee     Is the bAsset known to have a tx fee?
     */
    function withdraw(
        address _receiver,
        address _bAsset,
        uint256 _amount,
        bool _hasTxFee
    ) external override onlyLP nonReentrant {
        _withdraw(_receiver, _bAsset, _amount, _amount, _hasTxFee);
    }

    /**
     * @notice Withdraw a quantity of bAsset from Alchemix
     * @param _receiver     Address to which the withdrawn bAsset should be sent
     * @param _bAsset       Address of the bAsset
     * @param _amount       Units of bAsset to withdraw
     * @param _totalAmount  Total units to pull from lending platform
     * @param _hasTxFee     Is the bAsset known to have a tx fee?
     */
    function withdraw(
        address _receiver,
        address _bAsset,
        uint256 _amount,
        uint256 _totalAmount,
        bool _hasTxFee
    ) external override onlyLP nonReentrant {
        _withdraw(_receiver, _bAsset, _amount, _totalAmount, _hasTxFee);
    }

    function _withdraw(
        address _receiver,
        address _bAsset,
        uint256 _amount,
        uint256 _totalAmount,
        bool _hasTxFee
    ) internal {
        require(_receiver != address(0), "Must specify recipient");
        require(_bAsset == bAsset, "Invalid bAsset");
        require(_totalAmount > 0, "Must withdraw something");

        uint256 userWithdrawal = _amount;

        if (_hasTxFee) {
            require(_amount == _totalAmount, "Cache inactive with tx fee");
            IERC20 b = IERC20(_bAsset);
            uint256 prevBal = b.balanceOf(address(this));
            stakingPools.withdraw(poolId, _amount);
            uint256 newBal = b.balanceOf(address(this));
            userWithdrawal = _min(userWithdrawal, newBal - prevBal);
        } else {
            // Redeem Underlying bAsset amount
            stakingPools.withdraw(poolId, _totalAmount);
        }

        // Send redeemed bAsset to the receiver
        IERC20(_bAsset).safeTransfer(_receiver, userWithdrawal);

        emit PlatformWithdrawal(_bAsset, address(stakingPools), _totalAmount, _amount);
    }

    /**
     * @notice Withdraw a quantity of bAsset from the cache.
     * @param _receiver     Address to which the bAsset should be sent
     * @param _bAsset       Address of the bAsset
     * @param _amount       Units of bAsset to withdraw
     */
    function withdrawRaw(
        address _receiver,
        address _bAsset,
        uint256 _amount
    ) external override onlyLP nonReentrant {
        require(_receiver != address(0), "Must specify recipient");
        require(_bAsset == bAsset, "Invalid bAsset");
        require(_amount > 0, "Must withdraw something");

        IERC20(_bAsset).safeTransfer(_receiver, _amount);

        emit Withdrawal(_bAsset, address(0), _amount);
    }

    /**
     * @notice Get the total bAsset value held in the platform
     * @param _bAsset     Address of the bAsset
     * @return balance    Total value of the bAsset in the platform
     */
    function checkBalance(address _bAsset) external view override returns (uint256 balance) {
        require(_bAsset == bAsset, "Invalid bAsset");
        balance = stakingPools.getStakeTotalDeposited(address(this), poolId);
    }

    /***************************************
                    Liquidation
    ****************************************/

    /**
     *  @notice Claims any accrued reward tokens from the Alchemix staking pool.
     *          eg ALCX tokens from the alUSD deposits.
     *          Claimed rewards are sent to this integration contract.
     *  @dev    The Alchemix StakingPools will emit event
     *          TokensClaimed(user, poolId, amount)
     */
    function claimRewards() external {
        stakingPools.claim(poolId);
    }

    /***************************************
                    HELPERS
    ****************************************/

    /**
     * @dev Simple helper func to get the min of two values
     */
    function _min(uint256 x, uint256 y) internal pure returns (uint256) {
        return x > y ? y : x;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000afce80b19a8ce13dec0739a1aab7a028d6845eb30000000000000000000000004eaa01974b6594c0ee62ffd7fee56cf11e6af936000000000000000000000000dbdb4d16eda451d0503b854cf79d55697f90c8df000000000000000000000000ab8e74017a8cc7c15ffccd726603790d26d7deca000000000000000000000000bc6da0fe9ad5f3b0d58160288917aa56653660e9

-----Decoded View---------------
Arg [0] : _nexus (address): 0xAFcE80b19A8cE13DEc0739a1aaB7A028d6845Eb3
Arg [1] : _lp (address): 0x4eaa01974B6594C0Ee62fFd7FEE56CF11E6af936
Arg [2] : _rewardToken (address): 0xdBdb4d16EdA451D0503b854CF79D55697F90c8DF
Arg [3] : _stakingPools (address): 0xAB8e74017a8Cc7c15FFcCd726603790d26d7DeCa
Arg [4] : _bAsset (address): 0xBC6DA0FE9aD5f3b0d58160288917AA56653660E9

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000afce80b19a8ce13dec0739a1aab7a028d6845eb3
Arg [1] : 0000000000000000000000004eaa01974b6594c0ee62ffd7fee56cf11e6af936
Arg [2] : 000000000000000000000000dbdb4d16eda451d0503b854cf79d55697f90c8df
Arg [3] : 000000000000000000000000ab8e74017a8cc7c15ffccd726603790d26d7deca
Arg [4] : 000000000000000000000000bc6da0fe9ad5f3b0d58160288917aa56653660e9

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