Contract

/**
 *Submitted for verification at Etherscan.io on 2020-07-30
*/

pragma solidity 0.5.16;


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);
}

interface IRewardsDistributionRecipient {
    function notifyRewardAmount(uint256 reward) external;
    function getRewardToken() external view returns (IERC20);
}

contract InitializableModuleKeys {

    // Governance                             // Phases
    bytes32 internal KEY_GOVERNANCE;          // 2.x
    bytes32 internal KEY_STAKING;             // 1.2
    bytes32 internal KEY_PROXY_ADMIN;         // 1.0

    // mStable
    bytes32 internal KEY_ORACLE_HUB;          // 1.2
    bytes32 internal KEY_MANAGER;             // 1.2
    bytes32 internal KEY_RECOLLATERALISER;    // 2.x
    bytes32 internal KEY_META_TOKEN;          // 1.1
    bytes32 internal KEY_SAVINGS_MANAGER;     // 1.0

    /**
     * @dev Initialize function for upgradable proxy contracts. This function should be called
     *      via Proxy to initialize constants in the Proxy contract.
     */
    function _initialize() internal {
        // keccak256() values are evaluated only once at the time of this function call.
        // Hence, no need to assign hard-coded values to these variables.
        KEY_GOVERNANCE = keccak256("Governance");
        KEY_STAKING = keccak256("Staking");
        KEY_PROXY_ADMIN = keccak256("ProxyAdmin");

        KEY_ORACLE_HUB = keccak256("OracleHub");
        KEY_MANAGER = keccak256("Manager");
        KEY_RECOLLATERALISER = keccak256("Recollateraliser");
        KEY_META_TOKEN = keccak256("MetaToken");
        KEY_SAVINGS_MANAGER = keccak256("SavingsManager");
    }
}

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;
}

contract InitializableModule is InitializableModuleKeys {

    INexus public nexus;

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

    /**
     * @dev Modifier to allow function calls only from the Manager.
     */
    modifier onlyManager() {
        require(msg.sender == _manager(), "Only manager can execute");
        _;
    }

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

    /**
     * @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 Staking Module address from the Nexus
     * @return Address of the Staking Module contract
     */
    function _staking() internal view returns (address) {
        return nexus.getModule(KEY_STAKING);
    }

    /**
     * @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 Return MetaToken Module address from the Nexus
     * @return Address of the MetaToken Module contract
     */
    function _metaToken() internal view returns (address) {
        return nexus.getModule(KEY_META_TOKEN);
    }

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

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

    /**
     * @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);
    }
}

contract InitializableGovernableWhitelist is InitializableModule {

    event Whitelisted(address indexed _address);

    mapping(address => bool) public whitelist;

    /**
     * @dev Modifier to allow function calls only from the whitelisted address.
     */
    modifier onlyWhitelisted() {
        require(whitelist[msg.sender], "Not a whitelisted address");
        _;
    }

    /**
     * @dev Initialization function for upgradable proxy contracts
     * @param _nexus Nexus contract address
     * @param _whitelisted Array of whitelisted addresses.
     */
    function _initialize(
        address _nexus,
        address[] memory _whitelisted
    )
        internal
    {
        InitializableModule._initialize(_nexus);

        require(_whitelisted.length > 0, "Empty whitelist array");

        for(uint256 i = 0; i < _whitelisted.length; i++) {
            _addWhitelist(_whitelisted[i]);
        }
    }

    /**
     * @dev Adds a new whitelist address
     * @param _address Address to add in whitelist
     */
    function _addWhitelist(address _address) internal {
        require(_address != address(0), "Address is zero");
        require(! whitelist[_address], "Already whitelisted");

        whitelist[_address] = true;

        emit Whitelisted(_address);
    }

}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

library SafeERC20 {
    using SafeMath for uint256;
    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));
    }

    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).add(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}

/**
 * @title  RewardsDistributor
 * @author Stability Labs Pty. Ltd.
 * @notice RewardsDistributor allows Fund Managers to send rewards (usually in MTA)
 * to specified Reward Recipients.
 */
contract RewardsDistributor is InitializableGovernableWhitelist {

    using SafeERC20 for IERC20;

    event RemovedFundManager(address indexed _address);
    event DistributedReward(address funder, address recipient, address rewardToken, uint256 amount);

    /** @dev Recipient is a module, governed by mStable governance */
    constructor(
        address _nexus,
        address[] memory _fundManagers
    )
        public
    {
        InitializableGovernableWhitelist._initialize(_nexus, _fundManagers);
    }

    /**
     * @dev Allows the mStable governance to add a new FundManager
     * @param _address  FundManager to add
     */
    function addFundManager(address _address)
        external
        onlyGovernor
    {
        _addWhitelist(_address);
    }

    /**
     * @dev Allows the mStable governance to remove inactive FundManagers
     * @param _address  FundManager to remove
     */
    function removeFundManager(address _address)
        external
        onlyGovernor
    {
        require(_address != address(0), "Address is zero");
        require(whitelist[_address], "Address is not whitelisted");

        whitelist[_address] = false;

        emit RemovedFundManager(_address);
    }

    /**
     * @dev Distributes reward tokens to list of recipients and notifies them
     * of the transfer. Only callable by FundManagers
     * @param _recipients  Array of Reward recipients to credit
     * @param _amounts     Amounts of reward tokens to distribute
     */
    function distributeRewards(
        IRewardsDistributionRecipient[] calldata _recipients,
        uint256[] calldata _amounts
    )
        external
        onlyWhitelisted
    {
        uint256 len = _recipients.length;
        require(len > 0, "Must choose recipients");
        require(len == _amounts.length, "Mismatching inputs");

        for(uint i = 0; i < len; i++){
            uint256 amount = _amounts[i];
            IRewardsDistributionRecipient recipient = _recipients[i];
            // Send the RewardToken to recipient
            IERC20 rewardToken = recipient.getRewardToken();
            rewardToken.safeTransferFrom(msg.sender, address(recipient), amount);
            // Only after successfull tx - notify the contract of the new funds
            recipient.notifyRewardAmount(amount);

            emit DistributedReward(msg.sender, address(recipient), address(rewardToken), amount);
        }
    }
}

• Consensys Diligence - August 10th, 2020 - Security Audit Report

[{"inputs":[{"internalType":"address","name":"_nexus","type":"address"},{"internalType":"address[]","name":"_fundManagers","type":"address[]"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"funder","type":"address"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"address","name":"rewardToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"DistributedReward","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_address","type":"address"}],"name":"RemovedFundManager","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_address","type":"address"}],"name":"Whitelisted","type":"event"},{"constant":false,"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"addFundManager","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IRewardsDistributionRecipient[]","name":"_recipients","type":"address[]"},{"internalType":"uint256[]","name":"_amounts","type":"uint256[]"}],"name":"distributeRewards","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"nexus","outputs":[{"internalType":"contract INexus","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"removeFundManager","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"whitelist","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"}]

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