// SPDX-License-Identifier: MIT 
// File: contracts/capabilities/Proxiable.sol

pragma solidity 0.6.12;

contract Proxiable {
    // Code position in storage is keccak256("PROXIABLE") = "0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7"
    uint256 constant PROXIABLE_MEM_SLOT = 0xc5f16f0fcc639fa48a6947836d9850f504798523bf8c9a3a87d5876cf622bcf7;

    event CodeAddressUpdated(address newAddress);

    function _updateCodeAddress(address newAddress) internal {
        require(
            bytes32(PROXIABLE_MEM_SLOT) == Proxiable(newAddress).proxiableUUID(),
            "Not compatible"
        );
        assembly { // solium-disable-line
            sstore(PROXIABLE_MEM_SLOT, newAddress)
        }

        emit CodeAddressUpdated(newAddress);
    }

    function getLogicAddress() public view returns (address logicAddress) {
        assembly { // solium-disable-line
            logicAddress := sload(PROXIABLE_MEM_SLOT)
        }
    }

    function proxiableUUID() public pure returns (bytes32) {
        return bytes32(PROXIABLE_MEM_SLOT);
    }
}

// File: contracts/@openzeppelin/upgrades/contracts/Initializable.sol

pragma solidity >=0.4.24 <0.7.0;


/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
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 use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");

    bool isTopLevelCall = !initializing;
    if (isTopLevelCall) {
      initializing = true;
      initialized = true;
    }

    _;

    if (isTopLevelCall) {
      initializing = false;
    }
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    address self = address(this);
    uint256 cs;
    assembly { cs := extcodesize(self) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

// File: contracts/@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol

pragma solidity 0.6.12;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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);
}

// File: contracts/@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity 0.6.12;



/**
 * @dev Optional functions from the ERC20 standard.
 */
abstract contract ERC20Detailed is Initializable, IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    function initialize(string memory name, string memory symbol, uint8 decimals) public initializer {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    uint256[50] private ______gap;
}

// File: contracts/ERC1404.sol

pragma solidity 0.6.12;


abstract contract ERC1404 is IERC20 {
    /// @notice Detects if a transfer will be reverted and if so returns an appropriate reference code
    /// @param from Sending address
    /// @param to Receiving address
    /// @param value Amount of tokens being transferred
    /// @return Code by which to reference message for rejection reasoning
    /// @dev Overwrite with your custom transfer restriction logic
    function detectTransferRestriction (address from, address to, uint256 value) public virtual view returns (uint8);

    /// @notice Returns a human-readable message for a given restriction code
    /// @param restrictionCode Identifier for looking up a message
    /// @return Text showing the restriction's reasoning
    /// @dev Overwrite with your custom message and restrictionCode handling
    function messageForTransferRestriction (uint8 restrictionCode) public virtual view returns (string memory);
}

// File: contracts/@openzeppelin/contracts-ethereum-package/contracts/access/Roles.sol

pragma solidity 0.6.12;

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(account != address(0x0), "Invalid 0x0 address");
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

// File: contracts/roles/OwnerRole.sol

pragma solidity 0.6.12;


contract OwnerRole {
    using Roles for Roles.Role;

    event OwnerAdded(address indexed addedOwner, address indexed addedBy);
    event OwnerRemoved(address indexed removedOwner, address indexed removedBy);

    Roles.Role private _owners;

    modifier onlyOwner() {
        require(isOwner(msg.sender), "OwnerRole: caller does not have the Owner role");
        _;
    }

    function isOwner(address account) public view returns (bool) {
        return _owners.has(account);
    }

    function addOwner(address account) public onlyOwner {
        _addOwner(account);
    }

    function removeOwner(address account) public onlyOwner {
        _removeOwner(account);
    }

    function _addOwner(address account) internal {
        _owners.add(account);
        emit OwnerAdded(account, msg.sender);
    }

    function _removeOwner(address account) internal {
        _owners.remove(account);
        emit OwnerRemoved(account, msg.sender);
    }
}

// File: contracts/roles/WhitelisterRole.sol

pragma solidity 0.6.12;


contract WhitelisterRole is OwnerRole {

    event WhitelisterAdded(address indexed addedWhitelister, address indexed addedBy);
    event WhitelisterRemoved(address indexed removedWhitelister, address indexed removedBy);

    Roles.Role private _whitelisters;

    modifier onlyWhitelister() {
        require(isWhitelister(msg.sender), "WhitelisterRole: caller does not have the Whitelister role");
        _;
    }

    function isWhitelister(address account) public view returns (bool) {
        return _whitelisters.has(account);
    }

    function _addWhitelister(address account) internal {
        _whitelisters.add(account);
        emit WhitelisterAdded(account, msg.sender);
    }

    function _removeWhitelister(address account) internal {
        _whitelisters.remove(account);
        emit WhitelisterRemoved(account, msg.sender);
    }

    function addWhitelister(address account) public onlyOwner {
        _addWhitelister(account);
    }

    function removeWhitelister(address account) public onlyOwner {
        _removeWhitelister(account);
    }
}

// File: contracts/capabilities/Whitelistable.sol

pragma solidity 0.6.12;


/**
Keeps track of whitelists and can check if sender and reciever are configured to allow a transfer.
Only administrators can update the whitelists.
Any address can only be a member of one whitelist at a time.
 */
contract Whitelistable is WhitelisterRole {
    // Track whether whitelisting is enabled
    bool public isWhitelistEnabled;

    // Zero is reserved for indicating it is not on a whitelist
    uint8 constant NO_WHITELIST = 0;

    // The mapping to keep track of which whitelist any address belongs to.
    // 0 is reserved for no whitelist and is the default for all addresses.
    mapping (address => uint8) public addressWhitelists;

    // The mapping to keep track of each whitelist's outbound whitelist flags.
    // Boolean flag indicates whether outbound transfers are enabled.
    mapping(uint8 => mapping (uint8 => bool)) public outboundWhitelistsEnabled;

    // Events to allow tracking add/remove.
    event AddressAddedToWhitelist(address indexed addedAddress, uint8 indexed whitelist, address indexed addedBy);
    event AddressRemovedFromWhitelist(address indexed removedAddress, uint8 indexed whitelist, address indexed removedBy);
    event OutboundWhitelistUpdated(
        address indexed updatedBy, uint8 indexed sourceWhitelist, uint8 indexed destinationWhitelist, bool from, bool to);
    event WhitelistEnabledUpdated(address indexed updatedBy, bool indexed enabled);

    function _setWhitelistEnabled(bool enabled) internal {
        isWhitelistEnabled = enabled;
        emit WhitelistEnabledUpdated(msg.sender, enabled);
    }

    /**
    Sets an address's white list ID.  Only administrators should be allowed to update this.
    If an address is on an existing whitelist, it will just get updated to the new value (removed from previous).
     */
    function _addToWhitelist(address addressToAdd, uint8 whitelist) internal {
        // Verify a valid address was passed in
        require(addressToAdd != address(0), "Cannot add address 0x0 to a whitelist.");

        // Verify the whitelist is valid
        require(whitelist != NO_WHITELIST, "Invalid whitelist ID supplied");

        // Save off the previous white list
        uint8 previousWhitelist = addressWhitelists[addressToAdd];

        // Set the address's white list ID
        addressWhitelists[addressToAdd] = whitelist;

        // If the previous whitelist existed then we want to indicate it has been removed
        if(previousWhitelist != NO_WHITELIST) {
            // Emit the event for tracking
            emit AddressRemovedFromWhitelist(addressToAdd, previousWhitelist, msg.sender);
        }

        // Emit the event for new whitelist
        emit AddressAddedToWhitelist(addressToAdd, whitelist, msg.sender);
    }

    /**
    Clears out an address's white list ID.  Only administrators should be allowed to update this.
     */
    function _removeFromWhitelist(address addressToRemove) internal {
        // Verify a valid address was passed in
        require(addressToRemove != address(0), "Cannot remove address 0x0 from a whitelist.");

        // Save off the previous white list
        uint8 previousWhitelist = addressWhitelists[addressToRemove];

        // Verify the address was actually on a whitelist
        require(previousWhitelist != NO_WHITELIST, "Address cannot be removed from invalid whitelist.");

        // Zero out the previous white list
        addressWhitelists[addressToRemove] = NO_WHITELIST;

        // Emit the event for tracking
        emit AddressRemovedFromWhitelist(addressToRemove, previousWhitelist, msg.sender);
    }

    /**
    Sets the flag to indicate whether source whitelist is allowed to send to destination whitelist.
    Only administrators should be allowed to update this.
     */
    function _updateOutboundWhitelistEnabled(uint8 sourceWhitelist, uint8 destinationWhitelist, bool newEnabledValue) internal {
        // Get the old enabled flag
        bool oldEnabledValue = outboundWhitelistsEnabled[sourceWhitelist][destinationWhitelist];

        // Update to the new value
        outboundWhitelistsEnabled[sourceWhitelist][destinationWhitelist] = newEnabledValue;

        // Emit event for tracking
        emit OutboundWhitelistUpdated(msg.sender, sourceWhitelist, destinationWhitelist, oldEnabledValue, newEnabledValue);
    }

    /**
    Determine if the a sender is allowed to send to the receiver.
    The source whitelist must be enabled to send to the whitelist where the receive exists.
     */
    function checkWhitelistAllowed(address sender, address receiver) public view returns (bool) {
        // If whitelist enforcement is not enabled, then allow all
        if(!isWhitelistEnabled){
            return true;
        }

        // First get each address white list
        uint8 senderWhiteList = addressWhitelists[sender];
        uint8 receiverWhiteList = addressWhitelists[receiver];

        // If either address is not on a white list then the check should fail
        if(senderWhiteList == NO_WHITELIST || receiverWhiteList == NO_WHITELIST){
            return false;
        }

        // Determine if the sending whitelist is allowed to send to the destination whitelist
        return outboundWhitelistsEnabled[senderWhiteList][receiverWhiteList];
    }

    /**
     * Enable or disable the whitelist enforcement
     */
    function setWhitelistEnabled(bool enabled) public onlyOwner {
        _setWhitelistEnabled(enabled);
    }

    /**
    Public function that allows admins to remove an address from a whitelist
     */
    function addToWhitelist(address addressToAdd, uint8 whitelist) public onlyWhitelister {
        _addToWhitelist(addressToAdd, whitelist);
    }

    /**
    Public function that allows admins to remove an address from a whitelist
     */
    function removeFromWhitelist(address addressToRemove) public onlyWhitelister {
        _removeFromWhitelist(addressToRemove);
    }

    /**
    Public function that allows admins to update outbound whitelists
     */
    function updateOutboundWhitelistEnabled(uint8 sourceWhitelist, uint8 destinationWhitelist, bool newEnabledValue) public onlyWhitelister {
        _updateOutboundWhitelistEnabled(sourceWhitelist, destinationWhitelist, newEnabledValue);
    }
}

// File: contracts/@openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol

pragma solidity 0.6.12;


/*
 * @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 is Initializable {
    // 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: contracts/@openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol

pragma solidity 0.6.12;

/**
 * @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;
    }
}

// File: contracts/@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/ERC20.sol

pragma solidity 0.6.12;





/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20Mintable}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Initializable, Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }

    uint256[50] private ______gap;
}

// File: contracts/roles/MinterRole.sol

pragma solidity 0.6.12;


contract MinterRole is OwnerRole {

    event MinterAdded(address indexed addedMinter, address indexed addedBy);
    event MinterRemoved(address indexed removedMinter, address indexed removedBy);

    Roles.Role private _minters;

    modifier onlyMinter() {
        require(isMinter(msg.sender), "MinterRole: caller does not have the Minter role");
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account, msg.sender);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account, msg.sender);
    }

    function addMinter(address account) public onlyOwner {
        _addMinter(account);
    }

    function removeMinter(address account) public onlyOwner {
        _removeMinter(account);
    }

}

// File: contracts/capabilities/Mintable.sol

pragma solidity 0.6.12;



contract Mintable is ERC20, MinterRole {
  event Mint(address indexed minter, address indexed to, uint256 amount);

  function _mint(address minter, address to, uint256 amount) internal returns (bool) {
      ERC20._mint(to, amount);
      emit Mint(minter, to, amount);
      return true;
  }

  /**
  Allow Owners to mint tokens to valid addresses
  */
  function mint(address account, uint256 amount) public onlyMinter returns (bool) {
      return Mintable._mint(msg.sender, account, amount);
  }
}

// File: contracts/roles/BurnerRole.sol

pragma solidity 0.6.12;


contract BurnerRole is OwnerRole {

    event BurnerAdded(address indexed addedBurner, address indexed addedBy);
    event BurnerRemoved(address indexed removedBurner, address indexed removedBy);

    Roles.Role private _burners;

    modifier onlyBurner() {
        require(isBurner(msg.sender), "BurnerRole: caller does not have the Burner role");
        _;
    }

    function isBurner(address account) public view returns (bool) {
        return _burners.has(account);
    }

    function _addBurner(address account) internal {
        _burners.add(account);
        emit BurnerAdded(account, msg.sender);
    }

    function _removeBurner(address account) internal {
        _burners.remove(account);
        emit BurnerRemoved(account, msg.sender);
    }

    function addBurner(address account) public onlyOwner {
        _addBurner(account);
    }

    function removeBurner(address account) public onlyOwner {
        _removeBurner(account);
    }

}

// File: contracts/capabilities/Burnable.sol

pragma solidity 0.6.12;



contract Burnable is ERC20, BurnerRole {
  event Burn(address indexed burner, address indexed from, uint256 amount);

  function _burn(address burner, address from, uint256 amount) internal returns (bool) {
      ERC20._burn(from, amount);
      emit Burn(burner, from, amount);
      return true;
  }

  /**
  Allow Burners to burn tokens from valid addresses
  */
  function burn(address account, uint256 amount) public onlyBurner returns (bool) {
      return _burn(msg.sender, account, amount);
  }
}

// File: contracts/roles/RevokerRole.sol

pragma solidity 0.6.12;


contract RevokerRole is OwnerRole {

    event RevokerAdded(address indexed addedRevoker, address indexed addedBy);
    event RevokerRemoved(address indexed removedRevoker, address indexed removedBy);

    Roles.Role private _revokers;

    modifier onlyRevoker() {
        require(isRevoker(msg.sender), "RevokerRole: caller does not have the Revoker role");
        _;
    }

    function isRevoker(address account) public view returns (bool) {
        return _revokers.has(account);
    }

    function _addRevoker(address account) internal {
        _revokers.add(account);
        emit RevokerAdded(account, msg.sender);
    }

    function _removeRevoker(address account) internal {
        _revokers.remove(account);
        emit RevokerRemoved(account, msg.sender);
    }

    function addRevoker(address account) public onlyOwner {
        _addRevoker(account);
    }

    function removeRevoker(address account) public onlyOwner {
        _removeRevoker(account);
    }
}

// File: contracts/capabilities/Revocable.sol

pragma solidity 0.6.12;



contract Revocable is ERC20, RevokerRole {

  event Revoke(address indexed revoker, address indexed from, uint256 amount);

  function _revoke(
    address _from,
    uint256 _amount
  )
    internal
    returns (bool)
  {
    ERC20._transfer(_from, msg.sender, _amount);
    emit Revoke(msg.sender, _from, _amount);
    return true;
  }

  /**
  Allow Admins to revoke tokens from any address
    */
  function revoke(address from, uint256 amount) public onlyRevoker returns (bool) {
      return _revoke(from, amount);
  }
}

// File: contracts/roles/PauserRole.sol

pragma solidity 0.6.12;


contract PauserRole is OwnerRole {

    event PauserAdded(address indexed addedPauser, address indexed addedBy);
    event PauserRemoved(address indexed removedPauser, address indexed removedBy);

    Roles.Role private _pausers;

    modifier onlyPauser() {
        require(isPauser(msg.sender), "PauserRole: caller does not have the Pauser role");
        _;
    }

    function isPauser(address account) public view returns (bool) {
        return _pausers.has(account);
    }

    function _addPauser(address account) internal {
        _pausers.add(account);
        emit PauserAdded(account, msg.sender);
    }

    function _removePauser(address account) internal {
        _pausers.remove(account);
        emit PauserRemoved(account, msg.sender);
    }

    function addPauser(address account) public onlyOwner {
        _addPauser(account);
    }

    function removePauser(address account) public onlyOwner {
        _removePauser(account);
    }
}

// File: contracts/capabilities/Pausable.sol

pragma solidity 0.6.12;


/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is PauserRole {
    /**
     * @dev Emitted when the pause is triggered by a pauser (`account`).
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by a pauser (`account`).
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Called by an Owner to pause, triggers stopped state.
     */
    function _pause() internal {
        _paused = true;
        emit Paused(msg.sender);
    }

    /**
     * @dev Called by an Owner to unpause, returns to normal state.
     */
    function _unpause() internal {
        _paused = false;
        emit Unpaused(msg.sender);
    }

    /**
     * @dev Called by an Owner to pause, triggers stopped state.
     */
    function pause() public onlyPauser whenNotPaused {
        Pausable._pause();
    }

    /**
     * @dev Called by an Owner to unpause, returns to normal state.
     */
    function unpause() public onlyPauser whenPaused {
        Pausable._unpause();
    }
}

// File: contracts/TokenSoftToken.sol

pragma solidity 0.6.12;










contract TokenSoftToken is Proxiable, ERC20Detailed, ERC1404, OwnerRole, Whitelistable, Mintable, Burnable, Revocable, Pausable {

    // ERC1404 Error codes and messages
    uint8 public constant SUCCESS_CODE = 0;
    uint8 public constant FAILURE_NON_WHITELIST = 1;
    uint8 public constant FAILURE_PAUSED = 2;
    string public constant SUCCESS_MESSAGE = "SUCCESS";
    string public constant FAILURE_NON_WHITELIST_MESSAGE = "The transfer was restricted due to white list configuration.";
    string public constant FAILURE_PAUSED_MESSAGE = "The transfer was restricted due to the contract being paused.";
    string public constant UNKNOWN_ERROR = "Unknown Error Code";


    /**
    Constructor for the token to set readable details and mint all tokens
    to the specified owner.
     */
    function initialize (address owner, string memory name, string memory symbol, uint8 decimals, uint256 initialSupply, bool whitelistEnabled)
        public
        initializer
    {
        ERC20Detailed.initialize(name, symbol, decimals);
        Mintable._mint(msg.sender, owner, initialSupply);
        OwnerRole._addOwner(owner);
        Whitelistable._setWhitelistEnabled(whitelistEnabled);
    }

    /**
    Public function to update the address of the code contract, retricted to owner
     */
    function updateCodeAddress (address newAddress) public onlyOwner {
        Proxiable._updateCodeAddress(newAddress);
    }

    /**
    This function detects whether a transfer should be restricted and not allowed.
    If the function returns SUCCESS_CODE (0) then it should be allowed.
     */
    function detectTransferRestriction (address from, address to, uint256)
        public
        view
        virtual
        override
        returns (uint8)
    {
        // Check the paused status of the contract
        if (Pausable.paused()) {
            return FAILURE_PAUSED;
        }

        // If an owner transferring, then ignore whitelist restrictions
        if(OwnerRole.isOwner(from)) {
            return SUCCESS_CODE;
        }

        // Restrictions are enabled, so verify the whitelist config allows the transfer.
        // Logic defined in Whitelistable parent class
        if(!checkWhitelistAllowed(from, to)) {
            return FAILURE_NON_WHITELIST;
        }

        // If no restrictions were triggered return success
        return SUCCESS_CODE;
    }

    /**
    This function allows a wallet or other client to get a human readable string to show
    a user if a transfer was restricted.  It should return enough information for the user
    to know why it failed.
     */
    function messageForTransferRestriction (uint8 restrictionCode)
        public
        view
        virtual
        override
        returns (string memory)
    {
        if (restrictionCode == SUCCESS_CODE) {
            return SUCCESS_MESSAGE;
        }

        if (restrictionCode == FAILURE_NON_WHITELIST) {
            return FAILURE_NON_WHITELIST_MESSAGE;
        }

        if (restrictionCode == FAILURE_PAUSED) {
            return FAILURE_PAUSED_MESSAGE;
        }

        // An unknown error code was passed in.
        return UNKNOWN_ERROR;
    }

    /**
    Evaluates whether a transfer should be allowed or not.
     */
    modifier notRestricted (address from, address to, uint256 value) {
        uint8 restrictionCode = detectTransferRestriction(from, to, value);
        require(restrictionCode == SUCCESS_CODE, messageForTransferRestriction(restrictionCode));
        _;
    }

    /**
    Overrides the parent class token transfer function to enforce restrictions.
     */
    function transfer (address to, uint256 value)
        public
        virtual
        override(ERC20, IERC20)
        notRestricted(msg.sender, to, value)
        returns (bool success)
    {
        success = ERC20.transfer(to, value);
    }

    /**
    Overrides the parent class token transferFrom function to enforce restrictions.
     */
    function transferFrom (address from, address to, uint256 value)
        public
        virtual
        override(ERC20, IERC20)
        notRestricted(from, to, value)
        returns (bool success)
    {
        success = ERC20.transferFrom(from, to, value);
    }
}

// File: contracts/roles/BlacklisterRole.sol

pragma solidity 0.6.12;


contract BlacklisterRole is OwnerRole {

    event BlacklisterAdded(address indexed addedBlacklister, address indexed addedBy);
    event BlacklisterRemoved(address indexed removedBlacklister, address indexed removedBy);

    Roles.Role private _Blacklisters;

    modifier onlyBlacklister() {
        require(isBlacklister(msg.sender), "BlacklisterRole missing");
        _;
    }

    function isBlacklister(address account) public view returns (bool) {
        return _Blacklisters.has(account);
    }

    function _addBlacklister(address account) internal {
        _Blacklisters.add(account);
        emit BlacklisterAdded(account, msg.sender);
    }

    function _removeBlacklister(address account) internal {
        _Blacklisters.remove(account);
        emit BlacklisterRemoved(account, msg.sender);
    }

    function addBlacklister(address account) public onlyOwner {
        _addBlacklister(account);
    }

    function removeBlacklister(address account) public onlyOwner {
        _removeBlacklister(account);
    }

}

// File: contracts/capabilities/Blacklistable.sol

pragma solidity 0.6.12;


/**
Keeps track of Blacklists and can check if sender and reciever are configured to allow a transfer.
Only administrators can update the Blacklists.
 */
contract Blacklistable is BlacklisterRole {
    // Track whether Blacklisting is enabled
    bool public isBlacklistEnabled;

    // The mapping to keep track if an address is blacklisted
    mapping (address => bool) public addressBlacklists;

    // Events to allow tracking add/remove.
    event AddressAddedToBlacklist(address indexed addedAddress, address indexed addedBy);
    event AddressRemovedFromBlacklist(address indexed removedAddress, address indexed removedBy);    
    event BlacklistEnabledUpdated(address indexed updatedBy, bool indexed enabled);

    function _setBlacklistEnabled(bool enabled) internal {
        isBlacklistEnabled = enabled;
        emit BlacklistEnabledUpdated(msg.sender, enabled);
    }

    /**
    Sets an address's blacklisting status.  Only administrators should be allowed to update this.
     */
    function _addToBlacklist(address addressToAdd) internal {
        // Verify a valid address was passed in
        require(addressToAdd != address(0), "Cannot add 0x0");

        // Verify the address is on the blacklist before it can be removed
        require(!addressBlacklists[addressToAdd], "Already on list");

        // Set the address's white list ID
        addressBlacklists[addressToAdd] = true;

        // Emit the event for new Blacklist
        emit AddressAddedToBlacklist(addressToAdd, msg.sender);
    }

    /**
    Clears out an address from the blacklist.  Only administrators should be allowed to update this.
     */
    function _removeFromBlacklist(address addressToRemove) internal {
        // Verify a valid address was passed in
        require(addressToRemove != address(0), "Cannot remove 0x0");

        // Verify the address is on the blacklist before it can be removed
        require(addressBlacklists[addressToRemove], "Not on list");
        
        // Zero out the previous white list
        addressBlacklists[addressToRemove] = false;

        // Emit the event for tracking
        emit AddressRemovedFromBlacklist(addressToRemove, msg.sender);
    }


    /**
    Determine if the a sender is allowed to send to the receiver.
    If either the sender or receiver is blacklisted, then the transfer should be denied
     */
    function checkBlacklistAllowed(address sender, address receiver) public view returns (bool) {
        // If Blacklist enforcement is not enabled, then allow all
        if(!isBlacklistEnabled){
            return true;
        }

        // If either address is on the blacklist then fail
        return !addressBlacklists[sender] && !addressBlacklists[receiver];
    }

    /**
     * Enable or disable the Blacklist enforcement
     */
    function setBlacklistEnabled(bool enabled) public onlyOwner {
        _setBlacklistEnabled(enabled);
    }

    /**
    Public function that allows admins to remove an address from a Blacklist
     */
    function addToBlacklist(address addressToAdd) public onlyBlacklister {
        _addToBlacklist(addressToAdd);
    }

    /**
    Public function that allows admins to remove an address from a Blacklist
     */
    function removeFromBlacklist(address addressToRemove) public onlyBlacklister {
        _removeFromBlacklist(addressToRemove);
    }
}

// File: contracts/capabilities/RevocableToAddress.sol

pragma solidity 0.6.12;



contract RevocableToAddress is ERC20, RevokerRole {

  event RevokeToAddress(address indexed revoker, address indexed from, address indexed to, uint256 amount);

  function _revokeToAddress(
    address _from,
    address _to,
    uint256 _amount
  )
    internal
    returns (bool)
  {
    ERC20._transfer(_from, _to, _amount);
    emit RevokeToAddress(msg.sender, _from, _to, _amount);
    return true;
  }

  /**
  Allow Admins to revoke tokens from any address to any destination
    */
  function revokeToAddress(address from, address to, uint256 amount) public onlyRevoker returns (bool) {
      return _revokeToAddress(from, to, amount);
  }
}

// File: contracts/TokenSoftTokenV2.sol

pragma solidity 0.6.12;




/**
 @title Tokensoft Token V2
 @notice This contract implements the ERC1404 Interface to add transfer restrictions to a standard ER20 token.
 The role based access controls allow the Owner accounts to determine which permissions are granted to admin accounts.
 Admin accounts can enable, disable, and configure the token restrictions built into the contract.
 */
contract TokenSoftTokenV2 is TokenSoftToken, Blacklistable, RevocableToAddress {

  /// @notice The from/to account has been explicitly denied the ability to send/receive
  uint8 public constant FAILURE_BLACKLIST = 3;
  string public constant FAILURE_BLACKLIST_MESSAGE = "Restricted due to blacklist";

   /**
   @notice Used to detect if a proposed transfer will be allowed
   @dev A 0 return value is success - all other codes should be displayed to user via messageForTransferRestriction
    */
  function detectTransferRestriction (address from, address to, uint256 amt)
        public
        override
        view
        returns (uint8)
    {
        // Restrictions are enabled, so verify the whitelist config allows the transfer.
        // Logic defined in Blacklistable parent class
        if(!checkBlacklistAllowed(from, to)) {
            return FAILURE_BLACKLIST;
        }

        return TokenSoftToken.detectTransferRestriction(from, to, amt);
    }

  /**
  @notice Returns a human readable string for the error returned via detectTransferRestriction
  */ 
  function messageForTransferRestriction (uint8 restrictionCode)
        public
        override
        view
        returns (string memory)
    {
        if (restrictionCode == FAILURE_BLACKLIST) {
            return FAILURE_BLACKLIST_MESSAGE;
        }
        
        return TokenSoftToken.messageForTransferRestriction(restrictionCode);
    }

    /**
     @notice Transfers tokens if they are not restricted
     @dev Overrides the parent class token transfer function to enforce restrictions.
     */
    function transfer (address to, uint256 value)
        public
        override(TokenSoftToken, ERC20)
        notRestricted(msg.sender, to, value)
        returns (bool success)
    {
        return TokenSoftToken.transfer(to, value);
    }

    /**
    @notice Transfers from a specified address if they are not restricted
    @dev Overrides the parent class token transferFrom function to enforce restrictions.
     */
    function transferFrom (address from, address to, uint256 value)
        public
        override(TokenSoftToken, ERC20)
        notRestricted(from, to, value)
        returns (bool success)
    {
        return TokenSoftToken.transferFrom(from, to, value);
    }
}