// File: @openzeppelin/contracts/GSN/Context.sol

pragma solidity ^0.5.0;

/*
 * @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 GSN 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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @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.
 *
 * 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.
 */
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 () internal {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _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 onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/utils/Blacklistable.sol

pragma solidity ^0.5.0;


/**
 * @dev Allows accounts to be blacklisted by the owner of the contract.
 *
 *  Taken from USDC's contract for blacklisting certain addresses from owning and interacting with the token.
 */
contract Blacklistable is Ownable {

    string public constant BLACKLISTED = "BLACKLISTED";

    mapping(address => bool) internal blacklisted;

    event Blacklisted(address indexed account);
    event UnBlacklisted(address indexed account);
    event BlacklisterChanged(address indexed newBlacklister);

    /**
     * @dev Throws if called by any account other than the creator of this contract
    */
    modifier onlyBlacklister() {
        require(msg.sender == owner(), "MUST_BE_BLACKLISTER");
        _;
    }

    /**
     * @dev Throws if `account` is blacklisted
     *
     * @param account The address to check
    */
    modifier notBlacklisted(address account) {
        require(blacklisted[account] == false, BLACKLISTED);
        _;
    }

    /**
     * @dev Checks if `account` is blacklisted. Reverts with `BLACKLISTED` if blacklisted.
    */
    function checkNotBlacklisted(address account) public view {
        require(!blacklisted[account], BLACKLISTED);
    }

    /**
     * @dev Checks if `account` is blacklisted
     *
     * @param account The address to check
    */
    function isBlacklisted(address account) public view returns (bool) {
        return blacklisted[account];
    }

    /**
     * @dev Adds `account` to blacklist
     *
     * @param account The address to blacklist
    */
    function blacklist(address account) public onlyBlacklister {
        blacklisted[account] = true;
        emit Blacklisted(account);
    }

    /**
     * @dev Removes account from blacklist
     *
     * @param account The address to remove from the blacklist
    */
    function unBlacklist(address account) public onlyBlacklister {
        blacklisted[account] = false;
        emit UnBlacklisted(account);
    }

}

// File: contracts/impl/DmmBlacklistable.sol

pragma solidity ^0.5.0;


contract DmmBlacklistable is Blacklistable {

    constructor() public {
    }

}