Contract 0x617592b603a57B88dC4d2D9cFf180669390134bF

 

Contract Overview

StormX Global: Swap Contract
Balance:
0 Ether

EtherValue:
$0.00

Token:
Txn Hash
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0x0bada8c002ac6b6fb31ca275f5c57a61177d18d334a66e8e782e4eee776164eeConvert(pending)2022-09-25 2:33:165 days 22 hrs ago0x6edb57d8ddde0221c73cfadf18d2570cf602f3e8 IN StormX Global: Swap Contract0 Ether(Pending)(Pending)
0x9c6bd88e23b28c46c50d96a6270e1637abc78df57ff6a871f6ccf1d7c7b280eeConvert126256732021-06-13 10:50:34474 days 14 hrs ago0xfd5fda2f0367479044f691a0e7c9ef2aa8b0a707 IN  StormX Global: Swap Contract0 Ether0.000119445
0xdb10087e33feeaa15c37c3f745ada653d64d8f85771ad545b3e7643de29c00f9Disable Migratio...117977222021-02-05 17:46:45602 days 7 hrs ago0x5a8c45e03a4cda35b2f47f5f0ed5706a4ef77e2f IN  StormX Global: Swap Contract0 Ether0.0300174420
0x12a897d05abdcd9ab01cf673dbae9dd4ba1450ebb9219556229c594c63c74ca7Convert117823852021-02-03 9:08:28604 days 16 hrs ago0x563b4371c875f1c1df333f4516949f8c775db330 IN  StormX Global: Swap Contract0 Ether0.00689311129
0xa2f52e34e86b8945bdbcd379fee9df0a04687a579d8e646c1820e90c956103edConvert117823742021-02-03 9:06:13604 days 16 hrs ago0x563b4371c875f1c1df333f4516949f8c775db330 IN  StormX Global: Swap Contract0 Ether0.01074918129.00000145
0xd080e80f0a840af480ec186cf8031f85d2edb6d1bd062f3d606f31b025f09fe0Convert112337472020-11-11 3:06:44688 days 22 hrs ago0x147a8e7cd923d772c6caa775a26b60ff974e1a31 IN  StormX Global: Swap Contract0 Ether0.0030444257
0x1fbae8b8b6cd733413b3f641420bae7ea7fe5cc096a256640581d86da0d83854Convert112337392020-11-11 3:05:17688 days 22 hrs ago0x147a8e7cd923d772c6caa775a26b60ff974e1a31 IN  StormX Global: Swap Contract0 Ether0.0047537457
0x3090b5d4f0f0f0dba7717e57738db6e123081769584df97ce281944562ee845fConvert112336782020-11-11 2:48:14688 days 22 hrs ago0x3794a285b468d50ba5ddf39d0c7fa3d2d484b893 IN  StormX Global: Swap Contract0 Ether0.0027239651
0xd8ea4d11f85cad7b7847146f3738ba5600d124f51ffd973620408ecbe7dc2adcConvert112336612020-11-11 2:44:35688 days 22 hrs ago0x3794a285b468d50ba5ddf39d0c7fa3d2d484b893 IN  StormX Global: Swap Contract0 Ether0.004742956.87000176
0x8b8d98cd26a65bbaa15ca83615d9d6bd4e665b45c12a733ba7f5bc47887d962dConvert112319502020-11-10 20:33:13689 days 4 hrs ago0xbd8329435be7eb0575420528a6e536b14f577f4a IN  StormX Global: Swap Contract0 Ether0.0026684939
0xd287eac30392d18bd113fef826687887826b65bc5f6aa1f973f0fe3b7d9648c7Convert112319502020-11-10 20:33:13689 days 4 hrs ago0x7d17846530fd29c7014c2682a6ceed76d9fa3d92 IN  StormX Global: Swap Contract0 Ether0.0020825639
0x03e3957164571809abe7786865efc4baca9f752c16ff2210f7a0deace5e3f225Convert112319362020-11-10 20:30:55689 days 4 hrs ago0x7d17846530fd29c7014c2682a6ceed76d9fa3d92 IN  StormX Global: Swap Contract0 Ether0.0026675639
0xdcb9a22bf81df4192defdda22556639099f1fd3bfa7ec832268d1ed5b3ca97f5Convert112295612020-11-10 11:32:56689 days 13 hrs ago0x1971e079ee828456cc72aac525b2b21948532d52 IN  StormX Global: Swap Contract0 Ether0.0016418624
0x5a8746b3c732f250ca30f6fc39c8d209992547589eb7234a99f97e2870ed2fa7Convert112264232020-11-09 23:54:44690 days 1 hr ago0x745fe3252d9265c79f3b3c1a155de60ad79c1445 IN  StormX Global: Swap Contract0 Ether0.0010947616.00000145
0x209816ada4597c5f3dfa292b34d6311c652b632e9e7aab2d3a19bfe39724a3e6Convert112251352020-11-09 19:10:43690 days 6 hrs ago0x82e3903c42906b7216ee64781be575e642d37411 IN  StormX Global: Swap Contract0 Ether0.0015731723
0x09ac1f4254d8220123c220fb7883a97989505f0f19424a7e97b3f32b18ca4f5fConvert112251222020-11-09 19:08:11690 days 6 hrs ago0x82e3903c42906b7216ee64781be575e642d37411 IN  StormX Global: Swap Contract0 Ether0.0015734523
0x12afafba0da7f6bf4db56c0ddd1e63b1c5615393890d588810e2e64f0de6222cConvert112251022020-11-09 19:03:56690 days 6 hrs ago0x82e3903c42906b7216ee64781be575e642d37411 IN  StormX Global: Swap Contract0 Ether0.0019167923
0xe0f7c040ec0b7fba9ad432bbbbf648aad69d0329a6ec1dac3f83fc0111fd1ce9Convert112242402020-11-09 15:58:41690 days 9 hrs ago0x1971e079ee828456cc72aac525b2b21948532d52 IN  StormX Global: Swap Contract0 Ether0.0019363223.221
0x55dbd35d5c31cfa59ffe2f3cd9a073d58af15de96dc79fadbd370a6dc2315cbfConvert112242262020-11-09 15:55:47690 days 9 hrs ago0xa6dbc7f0e5d4ea23ab03f32bb15e5809860d5a68 IN  StormX Global: Swap Contract0 Ether0.0020526930
0x6634e7cad4f8e062282ed096defccbb10e7d2761136d912e58dd430083ddbc8bConvert112184862020-11-08 18:51:34691 days 6 hrs ago0x5d26d3a36db0d28336331cb58d96d17cde3d0655 IN  StormX Global: Swap Contract0 Ether0.0010333615.1
0x966ea1029364ded31ce8139141df039cd6b35a49a014947e548be166efb1a45eConvert112177042020-11-08 16:00:07691 days 9 hrs ago0x365ca732726c7644e1802e2ce0c324da28764bb1 IN  StormX Global: Swap Contract0 Ether0.0020834830.45
0x2d07abdd7229fc114525622efa5bb5156c99eeb7541099c9dd95065dc3d9f0b6Convert112164922020-11-08 11:34:56691 days 13 hrs ago0x93e0f1d9f5d7d593df26def23a6599e1d38f565d IN  StormX Global: Swap Contract0 Ether0.001299819
0xbab805f1173784847d0999a5b9057be28f37e3869188e91169535c62d5f28a1dConvert112114322020-11-07 16:40:51692 days 8 hrs ago0xbe86f2c6ee8fad758cf3adcc6eb503f01adf8657 IN  StormX Global: Swap Contract0 Ether0.003086237.00000145
0x154c2297cbd723760d95add3246872828c2dddc6801ed2c3569289ed3510e7f9Convert112100522020-11-07 11:29:08692 days 13 hrs ago0x56449e1febd3e3a8a87697e0ad82aaf956bd9052 IN  StormX Global: Swap Contract0 Ether0.0025023330
0x722aa237d241d75abaa07069a1d2b5095129f48aa017af86588e92c1e3ff57acConvert112098122020-11-07 10:37:02692 days 14 hrs ago0x41b30824b09e385299357168cfb58cee1074af8d IN  StormX Global: Swap Contract0 Ether0.0022520927
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Contract Source Code Verified (Exact Match)

Contract Name:
Swap

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-05-11
*/

// File: @openzeppelin/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

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

pragma solidity ^0.5.0;

/**
 * @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: @openzeppelin/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.0;


/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is 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.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _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;
    }
}

// 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/token/ERC20/ERC20.sol

pragma solidity ^0.5.0;




/**
 * @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 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 returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 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"));
    }
}

// File: @openzeppelin/contracts/GSN/IRelayRecipient.sol

pragma solidity ^0.5.0;

/**
 * @dev Base interface for a contract that will be called via the GSN from {IRelayHub}.
 *
 * TIP: You don't need to write an implementation yourself! Inherit from {GSNRecipient} instead.
 */
interface IRelayRecipient {
    /**
     * @dev Returns the address of the {IRelayHub} instance this recipient interacts with.
     */
    function getHubAddr() external view returns (address);

    /**
     * @dev Called by {IRelayHub} to validate if this recipient accepts being charged for a relayed call. Note that the
     * recipient will be charged regardless of the execution result of the relayed call (i.e. if it reverts or not).
     *
     * The relay request was originated by `from` and will be served by `relay`. `encodedFunction` is the relayed call
     * calldata, so its first four bytes are the function selector. The relayed call will be forwarded `gasLimit` gas,
     * and the transaction executed with a gas price of at least `gasPrice`. `relay`'s fee is `transactionFee`, and the
     * recipient will be charged at most `maxPossibleCharge` (in wei). `nonce` is the sender's (`from`) nonce for
     * replay attack protection in {IRelayHub}, and `approvalData` is a optional parameter that can be used to hold a signature
     * over all or some of the previous values.
     *
     * Returns a tuple, where the first value is used to indicate approval (0) or rejection (custom non-zero error code,
     * values 1 to 10 are reserved) and the second one is data to be passed to the other {IRelayRecipient} functions.
     *
     * {acceptRelayedCall} is called with 50k gas: if it runs out during execution, the request will be considered
     * rejected. A regular revert will also trigger a rejection.
     */
    function acceptRelayedCall(
        address relay,
        address from,
        bytes calldata encodedFunction,
        uint256 transactionFee,
        uint256 gasPrice,
        uint256 gasLimit,
        uint256 nonce,
        bytes calldata approvalData,
        uint256 maxPossibleCharge
    )
        external
        view
        returns (uint256, bytes memory);

    /**
     * @dev Called by {IRelayHub} on approved relay call requests, before the relayed call is executed. This allows to e.g.
     * pre-charge the sender of the transaction.
     *
     * `context` is the second value returned in the tuple by {acceptRelayedCall}.
     *
     * Returns a value to be passed to {postRelayedCall}.
     *
     * {preRelayedCall} is called with 100k gas: if it runs out during exection or otherwise reverts, the relayed call
     * will not be executed, but the recipient will still be charged for the transaction's cost.
     */
    function preRelayedCall(bytes calldata context) external returns (bytes32);

    /**
     * @dev Called by {IRelayHub} on approved relay call requests, after the relayed call is executed. This allows to e.g.
     * charge the user for the relayed call costs, return any overcharges from {preRelayedCall}, or perform
     * contract-specific bookkeeping.
     *
     * `context` is the second value returned in the tuple by {acceptRelayedCall}. `success` is the execution status of
     * the relayed call. `actualCharge` is an estimate of how much the recipient will be charged for the transaction,
     * not including any gas used by {postRelayedCall} itself. `preRetVal` is {preRelayedCall}'s return value.
     *
     *
     * {postRelayedCall} is called with 100k gas: if it runs out during execution or otherwise reverts, the relayed call
     * and the call to {preRelayedCall} will be reverted retroactively, but the recipient will still be charged for the
     * transaction's cost.
     */
    function postRelayedCall(bytes calldata context, bool success, uint256 actualCharge, bytes32 preRetVal) external;
}

// File: @openzeppelin/contracts/GSN/IRelayHub.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface for `RelayHub`, the core contract of the GSN. Users should not need to interact with this contract
 * directly.
 *
 * See the https://github.com/OpenZeppelin/openzeppelin-gsn-helpers[OpenZeppelin GSN helpers] for more information on
 * how to deploy an instance of `RelayHub` on your local test network.
 */
interface IRelayHub {
    // Relay management

    /**
     * @dev Adds stake to a relay and sets its `unstakeDelay`. If the relay does not exist, it is created, and the caller
     * of this function becomes its owner. If the relay already exists, only the owner can call this function. A relay
     * cannot be its own owner.
     *
     * All Ether in this function call will be added to the relay's stake.
     * Its unstake delay will be assigned to `unstakeDelay`, but the new value must be greater or equal to the current one.
     *
     * Emits a {Staked} event.
     */
    function stake(address relayaddr, uint256 unstakeDelay) external payable;

    /**
     * @dev Emitted when a relay's stake or unstakeDelay are increased
     */
    event Staked(address indexed relay, uint256 stake, uint256 unstakeDelay);

    /**
     * @dev Registers the caller as a relay.
     * The relay must be staked for, and not be a contract (i.e. this function must be called directly from an EOA).
     *
     * This function can be called multiple times, emitting new {RelayAdded} events. Note that the received
     * `transactionFee` is not enforced by {relayCall}.
     *
     * Emits a {RelayAdded} event.
     */
    function registerRelay(uint256 transactionFee, string calldata url) external;

    /**
     * @dev Emitted when a relay is registered or re-registerd. Looking at these events (and filtering out
     * {RelayRemoved} events) lets a client discover the list of available relays.
     */
    event RelayAdded(address indexed relay, address indexed owner, uint256 transactionFee, uint256 stake, uint256 unstakeDelay, string url);

    /**
     * @dev Removes (deregisters) a relay. Unregistered (but staked for) relays can also be removed.
     *
     * Can only be called by the owner of the relay. After the relay's `unstakeDelay` has elapsed, {unstake} will be
     * callable.
     *
     * Emits a {RelayRemoved} event.
     */
    function removeRelayByOwner(address relay) external;

    /**
     * @dev Emitted when a relay is removed (deregistered). `unstakeTime` is the time when unstake will be callable.
     */
    event RelayRemoved(address indexed relay, uint256 unstakeTime);

    /** Deletes the relay from the system, and gives back its stake to the owner.
     *
     * Can only be called by the relay owner, after `unstakeDelay` has elapsed since {removeRelayByOwner} was called.
     *
     * Emits an {Unstaked} event.
     */
    function unstake(address relay) external;

    /**
     * @dev Emitted when a relay is unstaked for, including the returned stake.
     */
    event Unstaked(address indexed relay, uint256 stake);

    // States a relay can be in
    enum RelayState {
        Unknown, // The relay is unknown to the system: it has never been staked for
        Staked, // The relay has been staked for, but it is not yet active
        Registered, // The relay has registered itself, and is active (can relay calls)
        Removed    // The relay has been removed by its owner and can no longer relay calls. It must wait for its unstakeDelay to elapse before it can unstake
    }

    /**
     * @dev Returns a relay's status. Note that relays can be deleted when unstaked or penalized, causing this function
     * to return an empty entry.
     */
    function getRelay(address relay) external view returns (uint256 totalStake, uint256 unstakeDelay, uint256 unstakeTime, address payable owner, RelayState state);

    // Balance management

    /**
     * @dev Deposits Ether for a contract, so that it can receive (and pay for) relayed transactions.
     *
     * Unused balance can only be withdrawn by the contract itself, by calling {withdraw}.
     *
     * Emits a {Deposited} event.
     */
    function depositFor(address target) external payable;

    /**
     * @dev Emitted when {depositFor} is called, including the amount and account that was funded.
     */
    event Deposited(address indexed recipient, address indexed from, uint256 amount);

    /**
     * @dev Returns an account's deposits. These can be either a contracts's funds, or a relay owner's revenue.
     */
    function balanceOf(address target) external view returns (uint256);

    /**
     * Withdraws from an account's balance, sending it back to it. Relay owners call this to retrieve their revenue, and
     * contracts can use it to reduce their funding.
     *
     * Emits a {Withdrawn} event.
     */
    function withdraw(uint256 amount, address payable dest) external;

    /**
     * @dev Emitted when an account withdraws funds from `RelayHub`.
     */
    event Withdrawn(address indexed account, address indexed dest, uint256 amount);

    // Relaying

    /**
     * @dev Checks if the `RelayHub` will accept a relayed operation.
     * Multiple things must be true for this to happen:
     *  - all arguments must be signed for by the sender (`from`)
     *  - the sender's nonce must be the current one
     *  - the recipient must accept this transaction (via {acceptRelayedCall})
     *
     * Returns a `PreconditionCheck` value (`OK` when the transaction can be relayed), or a recipient-specific error
     * code if it returns one in {acceptRelayedCall}.
     */
    function canRelay(
        address relay,
        address from,
        address to,
        bytes calldata encodedFunction,
        uint256 transactionFee,
        uint256 gasPrice,
        uint256 gasLimit,
        uint256 nonce,
        bytes calldata signature,
        bytes calldata approvalData
    ) external view returns (uint256 status, bytes memory recipientContext);

    // Preconditions for relaying, checked by canRelay and returned as the corresponding numeric values.
    enum PreconditionCheck {
        OK,                         // All checks passed, the call can be relayed
        WrongSignature,             // The transaction to relay is not signed by requested sender
        WrongNonce,                 // The provided nonce has already been used by the sender
        AcceptRelayedCallReverted,  // The recipient rejected this call via acceptRelayedCall
        InvalidRecipientStatusCode  // The recipient returned an invalid (reserved) status code
    }

    /**
     * @dev Relays a transaction.
     *
     * For this to succeed, multiple conditions must be met:
     *  - {canRelay} must `return PreconditionCheck.OK`
     *  - the sender must be a registered relay
     *  - the transaction's gas price must be larger or equal to the one that was requested by the sender
     *  - the transaction must have enough gas to not run out of gas if all internal transactions (calls to the
     * recipient) use all gas available to them
     *  - the recipient must have enough balance to pay the relay for the worst-case scenario (i.e. when all gas is
     * spent)
     *
     * If all conditions are met, the call will be relayed and the recipient charged. {preRelayedCall}, the encoded
     * function and {postRelayedCall} will be called in that order.
     *
     * Parameters:
     *  - `from`: the client originating the request
     *  - `to`: the target {IRelayRecipient} contract
     *  - `encodedFunction`: the function call to relay, including data
     *  - `transactionFee`: fee (%) the relay takes over actual gas cost
     *  - `gasPrice`: gas price the client is willing to pay
     *  - `gasLimit`: gas to forward when calling the encoded function
     *  - `nonce`: client's nonce
     *  - `signature`: client's signature over all previous params, plus the relay and RelayHub addresses
     *  - `approvalData`: dapp-specific data forwared to {acceptRelayedCall}. This value is *not* verified by the
     * `RelayHub`, but it still can be used for e.g. a signature.
     *
     * Emits a {TransactionRelayed} event.
     */
    function relayCall(
        address from,
        address to,
        bytes calldata encodedFunction,
        uint256 transactionFee,
        uint256 gasPrice,
        uint256 gasLimit,
        uint256 nonce,
        bytes calldata signature,
        bytes calldata approvalData
    ) external;

    /**
     * @dev Emitted when an attempt to relay a call failed.
     *
     * This can happen due to incorrect {relayCall} arguments, or the recipient not accepting the relayed call. The
     * actual relayed call was not executed, and the recipient not charged.
     *
     * The `reason` parameter contains an error code: values 1-10 correspond to `PreconditionCheck` entries, and values
     * over 10 are custom recipient error codes returned from {acceptRelayedCall}.
     */
    event CanRelayFailed(address indexed relay, address indexed from, address indexed to, bytes4 selector, uint256 reason);

    /**
     * @dev Emitted when a transaction is relayed. 
     * Useful when monitoring a relay's operation and relayed calls to a contract
     *
     * Note that the actual encoded function might be reverted: this is indicated in the `status` parameter.
     *
     * `charge` is the Ether value deducted from the recipient's balance, paid to the relay's owner.
     */
    event TransactionRelayed(address indexed relay, address indexed from, address indexed to, bytes4 selector, RelayCallStatus status, uint256 charge);

    // Reason error codes for the TransactionRelayed event
    enum RelayCallStatus {
        OK,                      // The transaction was successfully relayed and execution successful - never included in the event
        RelayedCallFailed,       // The transaction was relayed, but the relayed call failed
        PreRelayedFailed,        // The transaction was not relayed due to preRelatedCall reverting
        PostRelayedFailed,       // The transaction was relayed and reverted due to postRelatedCall reverting
        RecipientBalanceChanged  // The transaction was relayed and reverted due to the recipient's balance changing
    }

    /**
     * @dev Returns how much gas should be forwarded to a call to {relayCall}, in order to relay a transaction that will
     * spend up to `relayedCallStipend` gas.
     */
    function requiredGas(uint256 relayedCallStipend) external view returns (uint256);

    /**
     * @dev Returns the maximum recipient charge, given the amount of gas forwarded, gas price and relay fee.
     */
    function maxPossibleCharge(uint256 relayedCallStipend, uint256 gasPrice, uint256 transactionFee) external view returns (uint256);

     // Relay penalization. 
     // Any account can penalize relays, removing them from the system immediately, and rewarding the
    // reporter with half of the relay's stake. The other half is burned so that, even if the relay penalizes itself, it
    // still loses half of its stake.

    /**
     * @dev Penalize a relay that signed two transactions using the same nonce (making only the first one valid) and
     * different data (gas price, gas limit, etc. may be different).
     *
     * The (unsigned) transaction data and signature for both transactions must be provided.
     */
    function penalizeRepeatedNonce(bytes calldata unsignedTx1, bytes calldata signature1, bytes calldata unsignedTx2, bytes calldata signature2) external;

    /**
     * @dev Penalize a relay that sent a transaction that didn't target `RelayHub`'s {registerRelay} or {relayCall}.
     */
    function penalizeIllegalTransaction(bytes calldata unsignedTx, bytes calldata signature) external;

    /**
     * @dev Emitted when a relay is penalized.
     */
    event Penalized(address indexed relay, address sender, uint256 amount);

    /**
     * @dev Returns an account's nonce in `RelayHub`.
     */
    function getNonce(address from) external view returns (uint256);
}

// File: @openzeppelin/contracts/GSN/GSNRecipient.sol

pragma solidity ^0.5.0;




/**
 * @dev Base GSN recipient contract: includes the {IRelayRecipient} interface
 * and enables GSN support on all contracts in the inheritance tree.
 *
 * TIP: This contract is abstract. The functions {IRelayRecipient-acceptRelayedCall},
 *  {_preRelayedCall}, and {_postRelayedCall} are not implemented and must be
 * provided by derived contracts. See the
 * xref:ROOT:gsn-strategies.adoc#gsn-strategies[GSN strategies] for more
 * information on how to use the pre-built {GSNRecipientSignature} and
 * {GSNRecipientERC20Fee}, or how to write your own.
 */
contract GSNRecipient is IRelayRecipient, Context {
    // Default RelayHub address, deployed on mainnet and all testnets at the same address
    address private _relayHub = 0xD216153c06E857cD7f72665E0aF1d7D82172F494;

    uint256 constant private RELAYED_CALL_ACCEPTED = 0;
    uint256 constant private RELAYED_CALL_REJECTED = 11;

    // How much gas is forwarded to postRelayedCall
    uint256 constant internal POST_RELAYED_CALL_MAX_GAS = 100000;

    /**
     * @dev Emitted when a contract changes its {IRelayHub} contract to a new one.
     */
    event RelayHubChanged(address indexed oldRelayHub, address indexed newRelayHub);

    /**
     * @dev Returns the address of the {IRelayHub} contract for this recipient.
     */
    function getHubAddr() public view returns (address) {
        return _relayHub;
    }

    /**
     * @dev Switches to a new {IRelayHub} instance. This method is added for future-proofing: there's no reason to not
     * use the default instance.
     *
     * IMPORTANT: After upgrading, the {GSNRecipient} will no longer be able to receive relayed calls from the old
     * {IRelayHub} instance. Additionally, all funds should be previously withdrawn via {_withdrawDeposits}.
     */
    function _upgradeRelayHub(address newRelayHub) internal {
        address currentRelayHub = _relayHub;
        require(newRelayHub != address(0), "GSNRecipient: new RelayHub is the zero address");
        require(newRelayHub != currentRelayHub, "GSNRecipient: new RelayHub is the current one");

        emit RelayHubChanged(currentRelayHub, newRelayHub);

        _relayHub = newRelayHub;
    }

    /**
     * @dev Returns the version string of the {IRelayHub} for which this recipient implementation was built. If
     * {_upgradeRelayHub} is used, the new {IRelayHub} instance should be compatible with this version.
     */
    // This function is view for future-proofing, it may require reading from
    // storage in the future.
    function relayHubVersion() public view returns (string memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return "1.0.0";
    }

    /**
     * @dev Withdraws the recipient's deposits in `RelayHub`.
     *
     * Derived contracts should expose this in an external interface with proper access control.
     */
    function _withdrawDeposits(uint256 amount, address payable payee) internal {
        IRelayHub(_relayHub).withdraw(amount, payee);
    }

    // Overrides for Context's functions: when called from RelayHub, sender and
    // data require some pre-processing: the actual sender is stored at the end
    // of the call data, which in turns means it needs to be removed from it
    // when handling said data.

    /**
     * @dev Replacement for msg.sender. Returns the actual sender of a transaction: msg.sender for regular transactions,
     * and the end-user for GSN relayed calls (where msg.sender is actually `RelayHub`).
     *
     * IMPORTANT: Contracts derived from {GSNRecipient} should never use `msg.sender`, and use {_msgSender} instead.
     */
    function _msgSender() internal view returns (address payable) {
        if (msg.sender != _relayHub) {
            return msg.sender;
        } else {
            return _getRelayedCallSender();
        }
    }

    /**
     * @dev Replacement for msg.data. Returns the actual calldata of a transaction: msg.data for regular transactions,
     * and a reduced version for GSN relayed calls (where msg.data contains additional information).
     *
     * IMPORTANT: Contracts derived from {GSNRecipient} should never use `msg.data`, and use {_msgData} instead.
     */
    function _msgData() internal view returns (bytes memory) {
        if (msg.sender != _relayHub) {
            return msg.data;
        } else {
            return _getRelayedCallData();
        }
    }

    // Base implementations for pre and post relayedCall: only RelayHub can invoke them, and data is forwarded to the
    // internal hook.

    /**
     * @dev See `IRelayRecipient.preRelayedCall`.
     *
     * This function should not be overriden directly, use `_preRelayedCall` instead.
     *
     * * Requirements:
     *
     * - the caller must be the `RelayHub` contract.
     */
    function preRelayedCall(bytes calldata context) external returns (bytes32) {
        require(msg.sender == getHubAddr(), "GSNRecipient: caller is not RelayHub");
        return _preRelayedCall(context);
    }

    /**
     * @dev See `IRelayRecipient.preRelayedCall`.
     *
     * Called by `GSNRecipient.preRelayedCall`, which asserts the caller is the `RelayHub` contract. Derived contracts
     * must implement this function with any relayed-call preprocessing they may wish to do.
     *
     */
    function _preRelayedCall(bytes memory context) internal returns (bytes32);

    /**
     * @dev See `IRelayRecipient.postRelayedCall`.
     *
     * This function should not be overriden directly, use `_postRelayedCall` instead.
     *
     * * Requirements:
     *
     * - the caller must be the `RelayHub` contract.
     */
    function postRelayedCall(bytes calldata context, bool success, uint256 actualCharge, bytes32 preRetVal) external {
        require(msg.sender == getHubAddr(), "GSNRecipient: caller is not RelayHub");
        _postRelayedCall(context, success, actualCharge, preRetVal);
    }

    /**
     * @dev See `IRelayRecipient.postRelayedCall`.
     *
     * Called by `GSNRecipient.postRelayedCall`, which asserts the caller is the `RelayHub` contract. Derived contracts
     * must implement this function with any relayed-call postprocessing they may wish to do.
     *
     */
    function _postRelayedCall(bytes memory context, bool success, uint256 actualCharge, bytes32 preRetVal) internal;

    /**
     * @dev Return this in acceptRelayedCall to proceed with the execution of a relayed call. Note that this contract
     * will be charged a fee by RelayHub
     */
    function _approveRelayedCall() internal pure returns (uint256, bytes memory) {
        return _approveRelayedCall("");
    }

    /**
     * @dev See `GSNRecipient._approveRelayedCall`.
     *
     * This overload forwards `context` to _preRelayedCall and _postRelayedCall.
     */
    function _approveRelayedCall(bytes memory context) internal pure returns (uint256, bytes memory) {
        return (RELAYED_CALL_ACCEPTED, context);
    }

    /**
     * @dev Return this in acceptRelayedCall to impede execution of a relayed call. No fees will be charged.
     */
    function _rejectRelayedCall(uint256 errorCode) internal pure returns (uint256, bytes memory) {
        return (RELAYED_CALL_REJECTED + errorCode, "");
    }

    /*
     * @dev Calculates how much RelayHub will charge a recipient for using `gas` at a `gasPrice`, given a relayer's
     * `serviceFee`.
     */
    function _computeCharge(uint256 gas, uint256 gasPrice, uint256 serviceFee) internal pure returns (uint256) {
        // The fee is expressed as a percentage. E.g. a value of 40 stands for a 40% fee, so the recipient will be
        // charged for 1.4 times the spent amount.
        return (gas * gasPrice * (100 + serviceFee)) / 100;
    }

    function _getRelayedCallSender() private pure returns (address payable result) {
        // We need to read 20 bytes (an address) located at array index msg.data.length - 20. In memory, the array
        // is prefixed with a 32-byte length value, so we first add 32 to get the memory read index. However, doing
        // so would leave the address in the upper 20 bytes of the 32-byte word, which is inconvenient and would
        // require bit shifting. We therefore subtract 12 from the read index so the address lands on the lower 20
        // bytes. This can always be done due to the 32-byte prefix.

        // The final memory read index is msg.data.length - 20 + 32 - 12 = msg.data.length. Using inline assembly is the
        // easiest/most-efficient way to perform this operation.

        // These fields are not accessible from assembly
        bytes memory array = msg.data;
        uint256 index = msg.data.length;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those.
            result := and(mload(add(array, index)), 0xffffffffffffffffffffffffffffffffffffffff)
        }
        return result;
    }

    function _getRelayedCallData() private pure returns (bytes memory) {
        // RelayHub appends the sender address at the end of the calldata, so in order to retrieve the actual msg.data,
        // we must strip the last 20 bytes (length of an address type) from it.

        uint256 actualDataLength = msg.data.length - 20;
        bytes memory actualData = new bytes(actualDataLength);

        for (uint256 i = 0; i < actualDataLength; ++i) {
            actualData[i] = msg.data[i];
        }

        return actualData;
    }
}

// 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 {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @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: interface/IStormXToken.sol

pragma solidity 0.5.16;


contract IStormXToken is ERC20 {
  function unlockedBalanceOf(address account) public view returns (uint256);
}

// File: contracts/StormXGSNRecipient.sol

pragma solidity 0.5.16;






contract StormXGSNRecipient is GSNRecipient, Ownable {

  using SafeMath for uint256;

  // Variables and constants for supporting GSN
  uint256 constant INSUFFICIENT_BALANCE = 11;
  uint256 public chargeFee;
  address public stormXReserve;

  // importing ``StormXToken.sol`` results in infinite loop
  // using only an interface
  IStormXToken public token;
  
  event StormXReserveSet(address newAddress);
  event ChargeFeeSet(uint256 newFee);

  /**
   * @param tokenAddress address of `StormXToken.sol`
   * @param reserve address that receives GSN charge fee
   */
  constructor(address tokenAddress, address reserve) public {
    require(tokenAddress != address(0), "Invalid token address");
    require(reserve != address(0), "Invalid reserve address");

    token = IStormXToken(tokenAddress);
    stormXReserve = reserve;
    // decimals of StormXToken is 18
    chargeFee = 10 * (10 ** 18);
  }

  /**
   * Note: the documentation is copied from
   * `openzeppelin-contracts/contracts/GSN/IRelayRecipient.sol`
   * @dev Called by {IRelayHub} to validate
   * if this recipient accepts being charged for a relayed call.
   * Note that the recipient will be charged regardless of the execution result of the relayed call
   * (i.e. if it reverts or not).
   *
   * The relay request was originated by `from` and will be served by `relay`.
   * `encodedFunction` is the relayed call calldata,
   * so its first four bytes are the function selector.
   * The relayed call will be forwarded `gasLimit` gas,
   * and the transaction executed with a gas price of at least `gasPrice`.
   * `relay`'s fee is `transactionFee`,
   * and the recipient will be charged at most `maxPossibleCharge` (in wei).
   * `nonce` is the sender's (`from`) nonce for replay attack protection in {IRelayHub},
   * and `approvalData` is a optional parameter that can be used to hold a signature
   * over all or some of the previous values.
   *
   * Returns a tuple, where the first value is used to indicate approval (0)
   * or rejection (custom non-zero error code, values 1 to 10 are reserved)
   * and the second one is data to be passed to the other {IRelayRecipient} functions.
   *
   * {acceptRelayedCall} is called with 50k gas: if it runs out during execution,
   * the request will be considered
   * rejected. A regular revert will also trigger a rejection.
   */
  function acceptRelayedCall(
    address relay,
    address from,
    bytes calldata encodedFunction,
    uint256 transactionFee,
    uint256 gasPrice,
    uint256 gasLimit,
    uint256 nonce,
    bytes calldata approvalData,
    uint256 maxPossibleCharge
  )
    external
    view
    returns (uint256, bytes memory) {
      (bool accept, bool chargeBefore) = _acceptRelayedCall(from, encodedFunction);
      if (accept) {
        return  _approveRelayedCall(abi.encode(from, chargeBefore));
      } else {
        return _rejectRelayedCall(INSUFFICIENT_BALANCE);
      }
    }

  /**
   * @dev Sets the address of StormX's reserve
   * @param newReserve the new address of StormX's reserve
   * @return success status of the setting
   */
  function setStormXReserve(address newReserve) public onlyOwner returns (bool) {
    require(newReserve != address(0), "Invalid reserve address");
    stormXReserve = newReserve;
    emit StormXReserveSet(newReserve);
    return true;
  }

 /**
   * @dev Sets the charge fee for GSN calls
   * @param newFee the new charge fee
   * @return success status of the setting
   */
  function setChargeFee(uint256 newFee) public onlyOwner returns (bool) {
    chargeFee = newFee;
    emit ChargeFeeSet(newFee);
    return true;
  }

  /**
   * @dev Checks whether to accept a GSN relayed call
   * @param from the user originating the GSN relayed call
   * @param encodedFunction the function call to relay, including data
   * @return ``accept`` indicates whether to accept the relayed call
   *         ``chargeBefore`` indicates whether to charge before executing encoded function
   */
  function _acceptRelayedCall(
    address from,
    bytes memory encodedFunction
  ) internal view returns (bool accept, bool chargeBefore);

  function _preRelayedCall(bytes memory context) internal returns (bytes32) {
    (address user, bool chargeBefore) = abi.decode(context, (address, bool));
    // charge the user with specified amount of fee
    // if the user is not calling ``convert()``
    if (chargeBefore) {
      require(
        token.transferFrom(user, stormXReserve, chargeFee),
        "Charging fails before executing the function"
      );
    }
    return "";
  }

  function _postRelayedCall(
    bytes memory context,
    bool success,
    uint256 actualCharge,
    bytes32 preRetVal
  ) internal {
    (address user, bool chargeBefore) = abi.decode(context, (address, bool));
    if (!chargeBefore) {
      require(
        token.transferFrom(user, stormXReserve, chargeFee),
        "Charging fails after executing the function"
      );
    }
  }

  /**
   * @dev Reads a bytes4 value from a position in a byte array.
   * Note: for reference, see source code
   * https://etherscan.io/address/0xD216153c06E857cD7f72665E0aF1d7D82172F494#code
   * @param b Byte array containing a bytes4 value.
   * @param index Index in byte array of bytes4 value.
   * @return bytes4 value from byte array.
   */
  function readBytes4(
    bytes memory b,
    uint256 index
  ) internal
    pure
    returns (bytes4 result)
  {
    require(
      b.length >= index + 4,
      "GREATER_OR_EQUAL_TO_4_LENGTH_REQUIRED"
    );

    // Arrays are prefixed by a 32 byte length field
    index += 32;

    // Read the bytes4 from array memory
    assembly {
      result := mload(add(b, index))
      // Solidity does not require us to clean the trailing bytes.
      // We do it anyway
      result := and(result, 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
    }
    return result;
  }

  /**
   * @dev Reads a bytes32 value from a position in a byte array.
   * Note: for reference, see source code
   * https://etherscan.io/address/0xD216153c06E857cD7f72665E0aF1d7D82172F494#code
   * @param b Byte array containing a bytes32 value.
   * @param index Index in byte array of bytes32 value.
   * @return bytes32 value from byte array.
   */
  function readBytes32(
    bytes memory b,
    uint256 index
  )
    internal
    pure
    returns (bytes32 result)
  {
    require(
      b.length >= index + 32,
      "GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED"
    );

    // Arrays are prefixed by a 256 bit length parameter
    index += 32;

    // Read the bytes32 from array memory
    assembly {
      result := mload(add(b, index))
    }
    return result;
  }
  
  /**
   * @dev Reads a uint256 value from a position in a byte array.
   * Note: for reference, see source code
   * https://etherscan.io/address/0xD216153c06E857cD7f72665E0aF1d7D82172F494#code
   * @param b Byte array containing a uint256 value.
   * @param index Index in byte array of uint256 value.
   * @return uint256 value from byte array.
   */
  function readUint256(
    bytes memory b,
    uint256 index
  ) internal
    pure
    returns (uint256 result)
  {
    result = uint256(readBytes32(b, index));
    return result;
  }

 /**
  * @dev extract parameter from encoded-function block.
  * Note: for reference, see source code
  * https://etherscan.io/address/0xD216153c06E857cD7f72665E0aF1d7D82172F494#code
  * https://solidity.readthedocs.io/en/develop/abi-spec.html#formal-specification-of-the-encoding
  * note that the type of the parameter must be static.
  * the return value should be casted to the right type.
  * @param msgData encoded calldata
  * @param index in byte array of bytes memory
  * @return the parameter extracted from call data
  */
  function getParam(bytes memory msgData, uint index) internal pure returns (uint256) {
    return readUint256(msgData, 4 + index * 32);
  }
}

// File: contracts/StormXToken.sol

pragma solidity 0.5.16;






contract StormXToken is
  StormXGSNRecipient,
  ERC20,
  ERC20Detailed("StormX", "STMX", 18) {

  using SafeMath for uint256;

  bool public transfersEnabled;
  mapping(address => bool) public autoStakingDisabled;
  bool public initialized = false;
  address public swap;
  address public rewardRole;

  // Variables for staking feature
  mapping(address => uint256) public lockedBalanceOf;

  event TokenLocked(address indexed account, uint256 amount);
  event TokenUnlocked(address indexed account, uint256 amount);
  event TransfersEnabled(bool newStatus);
  event SwapAddressAdded(address swap);
  event RewardRoleAssigned(address rewardRole);
  event AutoStakingSet(address indexed account, bool status);

  modifier transfersAllowed {
    require(transfersEnabled, "Transfers not available");
    _;
  }

  modifier onlyAuthorized {
    require(_msgSender() == owner() || _msgSender() == rewardRole, "Not authorized");
    _;
  }

  /**
   * @param reserve address of the StormX's reserve that receives GSN charge fee
   * GSN charged fees and remaining tokens
   * after the token migration is closed
   */
  constructor(address reserve)
    // solhint-disable-next-line visibility-modifier-order
    StormXGSNRecipient(address(this), reserve) public {
    }

  /**
   * @param account address of the user this function queries unlocked balance for
   * @return the amount of unlocked tokens of the given address
   *         i.e. the amount of manipulable tokens of the given address
   */
  function unlockedBalanceOf(address account) public view returns (uint256) {
    return balanceOf(account).sub(lockedBalanceOf[account]);
  }

  /**
   * @dev Locks specified amount of tokens for the user
   *      Locked tokens are not manipulable until being unlocked
   *      Locked tokens are still reported as owned by the user
   *      when ``balanceOf()`` is called
   * @param amount specified amount of tokens to be locked
   * @return success status of the locking
   */
  function lock(uint256 amount) public returns (bool) {
    address account = _msgSender();
    require(unlockedBalanceOf(account) >= amount, "Not enough unlocked tokens");
    lockedBalanceOf[account] = lockedBalanceOf[account].add(amount);
    emit TokenLocked(account, amount);
    return true;
  }

  /**
   * @dev Unlocks specified amount of tokens for the user
   *      Unlocked tokens are manipulable until being locked
   * @param amount specified amount of tokens to be unlocked
   * @return success status of the unlocking
   */
  function unlock(uint256 amount) public returns (bool) {
    address account = _msgSender();
    require(lockedBalanceOf[account] >= amount, "Not enough locked tokens");
    lockedBalanceOf[account] = lockedBalanceOf[account].sub(amount);
    emit TokenUnlocked(account, amount);
    return true;
  }

  /**
   * @dev The only difference from standard ERC20 ``transferFrom()`` is that
   *     it only succeeds if the sender has enough unlocked tokens
   *     Note: this function is also used by every StormXGSNRecipient
   *           when charging.
   * @param sender address of the sender
   * @param recipient address of the recipient
   * @param amount specified amount of tokens to be transferred
   * @return success status of the transferring
   */
  function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
    require(unlockedBalanceOf(sender) >= amount, "Not enough unlocked token balance of sender");
    // if the msg.sender is charging ``sender`` for a GSN fee
    // allowance does not apply
    // so that no user approval is required for GSN calls
    if (_msgSender() == address(this) || _msgSender() == swap) {
      _transfer(sender, recipient, amount);
      return true;
    } else {
      return super.transferFrom(sender, recipient, amount);
    }
  }

  /**
   * @dev The only difference from standard ERC20 ``transfer()`` is that
   *     it only succeeds if the user has enough unlocked tokens
   * @param recipient address of the recipient
   * @param amount specified amount of tokens to be transferred
   * @return success status of the transferring
   */
  function transfer(address recipient, uint256 amount) public returns (bool) {
    require(unlockedBalanceOf(_msgSender()) >= amount, "Not enough unlocked token balance");
    return super.transfer(recipient, amount);
  }

  /**
   * @dev Transfers tokens in batch
   * @param recipients an array of recipient addresses
   * @param values an array of specified amount of tokens to be transferred
   * @return success status of the batch transferring
   */
  function transfers(
    address[] memory recipients,
    uint256[] memory values
  ) public transfersAllowed returns (bool) {
    require(recipients.length == values.length, "Input lengths do not match");

    for (uint256 i = 0; i < recipients.length; i++) {
      transfer(recipients[i], values[i]);
    }
    return true;
  }

  /**
   * @dev Enables the method ``transfers()`` if ``enable=true``,
   * and disables ``transfers()`` otherwise
   * @param enable the expected new availability of the method ``transfers()``
   */
  function enableTransfers(bool enable) public onlyOwner returns (bool) {
    transfersEnabled = enable;
    emit TransfersEnabled(enable);
    return true;
  }

  function mint(address account, uint256 amount) public {
    require(initialized, "The contract is not initialized yet");
    require(_msgSender() == swap, "not authorized to mint");
    _mint(account, amount);
  }

  /**
   * @dev Initializes this contract
   *      Sets address ``swap`` as the only valid minter for this token
   *      Note: must be called before token migration opens in ``Swap.sol``
   * @param _swap address of the deployed contract ``Swap.sol``
   */
  function initialize(address _swap) public onlyOwner {
    require(!initialized, "cannot initialize twice");
    require(_swap != address(0), "invalid swap address");
    swap = _swap;
    transfersEnabled = true;
    emit TransfersEnabled(true);
    initialized = true;
    emit SwapAddressAdded(_swap);
  }

  /**
   * @dev Assigns `rewardRole` to the specified address
   * @param account address to be assigned as the `rewardRole`
   */
  function assignRewardRole(address account) public onlyOwner {
    rewardRole = account;
    emit RewardRoleAssigned(account);
  }

  /**
   * @dev Transfers tokens to users as rewards
   * @param recipient address that receives the rewarded tokens
   * @param amount amount of rewarded tokens
   */
  function reward(address recipient, uint256 amount) public onlyAuthorized {
    require(recipient != address(0), "Invalid recipient address provided");

    require(transfer(recipient, amount), "Transfer fails when rewarding a user");
    // If `autoStakingDisabled[user] == false`,
    // auto staking is enabled for current user
    if (!autoStakingDisabled[recipient]) {
      lockedBalanceOf[recipient] = lockedBalanceOf[recipient].add(amount);
      emit TokenLocked(recipient, amount);
    }
  }

  /**
   * @dev Rewards users in batch
   * @param recipients an array of recipient address
   * @param values an array of specified amount of tokens to be rewarded
   */
  function rewards(address[] memory recipients, uint256[] memory values) public onlyAuthorized {
    require(recipients.length == values.length, "Input lengths do not match");

    for (uint256 i = 0; i < recipients.length; i++) {
      reward(recipients[i], values[i]);
    }
  }

  /**
   * @dev Sets auto-staking feature status for users
   * If `enabled = true`, rewarded tokens will be automatically staked for the message sender
   * Else, rewarded tokens will not be automatically staked for the message sender.
   * @param enabled expected status of the user's auto-staking feature status
   */
  function setAutoStaking(bool enabled) public {
    // If `enabled == false`, set `autoStakingDisabled[user] = true`
    autoStakingDisabled[_msgSender()] = !enabled;
    emit AutoStakingSet(_msgSender(), enabled);
  }

  /**
   * @dev Checks whether to accept a GSN relayed call
   * @param from the user originating the GSN relayed call
   * @param encodedFunction the function call to relay, including data
   * @return ``accept`` indicates whether to accept the relayed call
   *         ``chargeBefore`` indicates whether to charge before executing encoded function
   */
  function _acceptRelayedCall(
    address from,
    bytes memory encodedFunction
  ) internal view returns (bool accept, bool chargeBefore) {
    bool chargeBefore = true;
    uint256 unlockedBalance = unlockedBalanceOf(from);
    if (unlockedBalance < chargeFee) {
      // charge users after executing the encoded function
      chargeBefore = false;
      bytes4 selector = readBytes4(encodedFunction, 0);
      if (selector == bytes4(keccak256("unlock(uint256)"))) {
        // unlocked token balance for the user if transaction succeeds
        uint256 amount = uint256(getParam(encodedFunction, 0)).add(unlockedBalance);
        return (amount >= chargeFee, chargeBefore);
      } else if (selector == bytes4(keccak256("transferFrom(address,address,uint256)"))) {
        address sender = address(getParam(encodedFunction, 0));
        address recipient = address(getParam(encodedFunction, 1));
        uint256 amount = getParam(encodedFunction, 2);

        bool accept = recipient == from &&
          // no real effect of `transferfrom()` if `sender == recipient`
          sender != recipient &&
          // `from` can have enough unlocked token balance after the transaction
          amount.add(unlockedBalance) >= chargeFee &&
          // check `transferFrom()` can be executed successfully
          unlockedBalanceOf(sender) >= amount &&
          allowance(sender, from) >= amount;
        return (accept, chargeBefore);
      } else {
        // if rejects the call, the value of chargeBefore does not matter
        return (false, chargeBefore);
      }
    } else {
      return (true, chargeBefore);
    }
  }
}

// File: mock/OldStormXToken.sol

/**
 * Submitted for verification at Etherscan.io on 2018-06-20
 * This mock is for testing
 * Modifications have been made regarding syntax to align with
 * current solidity version
*/

pragma solidity 0.5.16;



contract ItokenRecipient {
  function receiveApproval(address _from, uint256 _value, address _token, bytes memory _extraData) public;
}

contract Owned {
    address public owner;
    address public newOwner;

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        assert(msg.sender == owner);
        _;
    }

    function transferOwnership(address _newOwner) public onlyOwner {
        require(_newOwner != owner);
        newOwner = _newOwner;
    }

    function acceptOwnership() public {
        require(msg.sender == newOwner);
        emit OwnerUpdate(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }

    event OwnerUpdate(address _prevOwner, address _newOwner);
}

contract IERC20Token {
  function totalSupply() public returns (uint256 totalSupply);
  function balanceOf(address _owner) public view returns (uint256 balance) {}
  function transfer(address _to, uint256 _value) public returns (bool success) {}
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {}
  function approve(address _spender, uint256 _value) public returns (bool success) {}
  function allowance(address _owner, address _spender) public returns (uint256 remaining) {}

  event Transfer(address indexed _from, address indexed _to, uint256 _value);
  event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

contract Token is IERC20Token, Owned {

  using SafeMath for uint256;

  /* Public variables of the token */
  string public standard;
  string public name;
  string public symbol;
  uint8 public decimals;

  address public crowdsaleContractAddress;

  /* Private variables of the token */
  uint256 supply = 0;
  mapping (address => uint256) balances;
  mapping (address => mapping (address => uint256)) allowances;

  /* Events */
  event Mint(address indexed _to, uint256 _value);

  // validates address is the crowdsale owner
  modifier onlyCrowdsaleOwner() {
      require(msg.sender == crowdsaleContractAddress);
      _;
  }

  constructor() public {}

  /* Returns total supply of issued tokens */
  function totalSupply() public returns (uint256) {
    return supply;
  }

  /* Returns balance of address */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

  /* Transfers tokens from your address to other */
  function transfer(address _to, uint256 _value) public returns (bool success) {
    require(_to != address(0) && _to != address(this));
    balances[msg.sender] = balances[msg.sender].sub(_value); // Deduct senders balance
    balances[_to] = balances[_to].add(_value);               // Add recivers blaance
    emit Transfer(msg.sender, _to, _value);                       // Raise Transfer event
    return true;
  }

  /* Approve other address to spend tokens on your account */
  function approve(address _spender, uint256 _value) public returns (bool success) {
    allowances[msg.sender][_spender] = _value;        // Set allowance
    emit Approval(msg.sender, _spender, _value);           // Raise Approval event
    return true;
  }

  /* Approve and then communicate the approved contract in a single tx */
  function approveAndCall(address _spender, uint256 _value, bytes memory _extraData) public returns (bool success) {
    ItokenRecipient spender = ItokenRecipient(_spender);            // Cast spender to tokenRecipient contract
    approve(_spender, _value);                                      // Set approval to contract for _value
    spender.receiveApproval(msg.sender, _value, address(this), _extraData);  // Raise method on _spender contract
    return true;
  }

  /* A contract attempts to get the coins */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
    require(_to != address(0) && _to != address(this));
    balances[_from] = balances[_from].sub(_value);                              // Deduct senders balance
    balances[_to] = balances[_to].add(_value);                                  // Add recipient blaance
    allowances[_from][msg.sender] = allowances[_from][msg.sender].sub(_value);  // Deduct allowance for this address
    emit Transfer(_from, _to, _value);                                               // Raise Transfer event
    return true;
  }

  function allowance(address _owner, address _spender) public returns (uint256 remaining) {
    return allowances[_owner][_spender];
  }

  function mintTokens(address _to, uint256 _amount) public onlyCrowdsaleOwner {
    supply = supply.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(msg.sender, _to, _amount);
  }

  function salvageTokensFromContract(address _tokenAddress, address _to, uint _amount) public onlyOwner {
    IERC20Token(_tokenAddress).transfer(_to, _amount);
  }
}

contract StormToken is Token {

	bool public transfersEnabled = false;    // true if transfer/transferFrom are enabled, false if not

	// triggered when the total supply is increased
	event Issuance(uint256 _amount);
	// triggered when the total supply is decreased
	event Destruction(uint256 _amount);


  /* Initializes contract */
  constructor(address _crowdsaleAddress) public {
    standard = "Storm Token v1.0";
    name = "Storm Token";
    symbol = "STORM"; // token symbol
    decimals = 18;
    crowdsaleContractAddress = _crowdsaleAddress;
  }

    // validates an address - currently only checks that it isn't null
    modifier validAddress(address _address) {
        require(_address != address(0));
        _;
    }

    // verifies that the address is different than this contract address
    modifier notThis(address _address) {
        require(_address != address(this));
        _;
    }

    // allows execution only when transfers aren't disabled
    modifier transfersAllowed {
        assert(transfersEnabled);
        _;
    }

   /**
        @dev disables/enables transfers
        can only be called by the contract owner

        @param _disable    true to disable transfers, false to enable them
    */
    function disableTransfers(bool _disable) public onlyOwner {
        transfersEnabled = !_disable;
    }

    /**
        @dev increases the token supply and sends the new tokens to an account
        can only be called by the contract owner

        @param _to         account to receive the new amount
        @param _amount     amount to increase the supply by
    */
    function issue(address _to, uint256 _amount)
        public
        onlyOwner
        validAddress(_to)
        notThis(_to)
    {
        supply = supply.add(_amount);
        balances[_to] = balances[_to].add(_amount);

        emit Issuance(_amount);
        emit Transfer(address(this), _to, _amount);
    }

    /**
        @dev removes tokens from an account and decreases the token supply
        can be called by the contract owner to destroy tokens from any account or by any holder to destroy tokens from his/her own account

        @param _from       account to remove the amount from
        @param _amount     amount to decrease the supply by
    */
    function destroy(address _from, uint256 _amount) public {
        require(msg.sender == _from || msg.sender == owner); // validate input

        balances[_from] = balances[_from].sub(_amount);
        supply = supply.sub(_amount);

        emit Transfer(_from, address(this), _amount);
        emit Destruction(_amount);
    }

    // ERC20 standard method overrides with some extra functionality

    /**
        @dev send coins
        throws on any error rather then return a false flag to minimize user errors
        in addition to the standard checks, the function throws if transfers are disabled

        @param _to      target address
        @param _value   transfer amount

        @return true if the transfer was successful, false if it wasn't
    */
    function transfer(address _to, uint256 _value) public transfersAllowed returns (bool success) {
        assert(super.transfer(_to, _value));
        return true;
    }
  
    function transfers(address[] memory _recipients, uint256[] memory _values) public transfersAllowed onlyOwner returns (bool success) {
        require(_recipients.length == _values.length); // Check if input data is correct

        for (uint cnt = 0; cnt < _recipients.length; cnt++) {
            assert(super.transfer(_recipients[cnt], _values[cnt]));
        }
        return true;
    }

    /**
        @dev an account/contract attempts to get the coins
        throws on any error rather then return a false flag to minimize user errors
        in addition to the standard checks, the function throws if transfers are disabled

        @param _from    source address
        @param _to      target address
        @param _value   transfer amount

        @return true if the transfer was successful, false if it wasn't
    */
    function transferFrom(address _from, address _to, uint256 _value) public transfersAllowed returns (bool success) {
        assert(super.transferFrom(_from, _to, _value));
        return true;
    }
}

// File: contracts/Swap.sol

pragma solidity 0.5.16;






contract Swap is StormXGSNRecipient {       

  using SafeMath for uint256;

  StormToken public oldToken;
  StormXToken public newToken;
  bool public initialized;

  // Variables for supporting token swap
  bool public migrationOpen;
  uint256 public initializeTime;

  // Token migration should be open no shorter than 16 weeks,
  // which is roughly 4 months
  uint256 constant public MIGRATION_TIME = 16 weeks;

  event Initialized(uint256 initializeTime);
  event MigrationOpen();
  event MigrationClosed();
  event MigrationLeftoverTransferred(address stormXReserve, uint256 amount);
  event TokenConverted(address indexed account, uint256 newToken);

  modifier canMigrate() {
    require(migrationOpen, "Token Migration not available");
    _;
  }

  constructor(
    address _oldToken, 
    address _newToken, 
    address reserve
  // solhint-disable-next-line visibility-modifier-order
  ) StormXGSNRecipient(_newToken, reserve) public { 
    require(_oldToken != address(0), "Invalid old token address");
    oldToken = StormToken(_oldToken);
    newToken = StormXToken(_newToken);
  }

  /**
   * @dev Accepts the ownership of the old token and
   *      opens the token migration
   *      Important: the ownership of the old token should be transferred
   *      to this contract before calling this function
   */
  function initialize() public {
    require(!initialized, "cannot initialize twice");
    oldToken.acceptOwnership();
    initialized = true;
    initializeTime = now;
    emit Initialized(initializeTime);

    // open token migration when this contract is initialized successfully
    migrationOpen = true;
    emit MigrationOpen();
  }

  /**
   * @dev Transfers the ownership of the old token to a new owner
   *      Reverts if current contract is not the owner yet
   *      Note: after this function is invoked, ``newOwner`` has to
   *      accept the ownership to become the actual owner by calling
   *      ``acceptOwnership()`` of the old token contract  
   * @param newOwner the expected new owner of the old token contract
   */
  function transferOldTokenOwnership(address newOwner) public onlyOwner {
    oldToken.transferOwnership(newOwner);
  }

  /**
   * @dev Swaps certain amount of old tokens to new tokens for the user
   * @param amount specified amount of old tokens to swap
   * @return success status of the conversion
   */
  function convert(uint256 amount) public canMigrate returns (bool) {
    address account = _msgSender();
    require(oldToken.balanceOf(_msgSender()) >= amount, "Not enough balance");
    
    // requires the ownership of original token contract
    oldToken.destroy(account, amount); 
    newToken.mint(account, amount);
    emit TokenConverted(account, amount);
    return true;
  }

  /**
   * @dev Disables token migration successfully if it has already been MIGRATION_TIME
   *      since token migration opens, reverts otherwise
   * @param reserve the address that the remaining tokens are sent to 
   * @return success status
   */
  function disableMigration(address reserve) public onlyOwner canMigrate returns (bool) {
    require(reserve != address(0), "Invalid reserve address provided");
    require(now - initializeTime >= MIGRATION_TIME, "Not able to disable token migration yet");
    migrationOpen = false;
    emit MigrationClosed();
    mintAndTransfer(reserve);
    return true;
  }

  /**
   * @dev Called by ``disableMigration()`` 
   *      if token migration is closed successfully.
   *      Mint and transfer the remaining tokens to stormXReserve
   * @param reserve the address that the remaining tokens are sent to 
   * @return success status
   */
  function mintAndTransfer(address reserve) internal returns (bool) {
    uint256 amount = oldToken.totalSupply();
    newToken.mint(reserve, amount);
    emit MigrationLeftoverTransferred(reserve, amount);
    return true;
  }

   /**
   * @dev Checks whether to accept a GSN relayed call
   * @param from the user originating the GSN relayed call
   * @param encodedFunction the function call to relay, including data
   * @return ``accept`` indicates whether to accept the relayed call
   *         ``chargeBefore`` indicates whether to charge before executing encoded function
   */
  function _acceptRelayedCall(
    address from,
    bytes memory encodedFunction
  ) internal view returns (bool accept, bool chargeBefore) {
    bool chargeBefore = true;
    uint256 unlockedBalance = token.unlockedBalanceOf(from);
    if (unlockedBalance < chargeFee) {
      // charge users after executing the encoded function
      chargeBefore = false;
      bytes4 selector = readBytes4(encodedFunction, 0);
      if (selector == bytes4(keccak256("convert(uint256)"))) {
        // unlocked token balance for the user if transaction succeeds
        uint256 amount = uint256(getParam(encodedFunction, 0)).add(unlockedBalance);
        return (amount >= chargeFee, chargeBefore);
      } else {
        return (false, chargeBefore);
      }
    } else {
      return (true, chargeBefore);
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_oldToken","type":"address"},{"internalType":"address","name":"_newToken","type":"address"},{"internalType":"address","name":"reserve","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"newFee","type":"uint256"}],"name":"ChargeFeeSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"initializeTime","type":"uint256"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[],"name":"MigrationClosed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"stormXReserve","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"MigrationLeftoverTransferred","type":"event"},{"anonymous":false,"inputs":[],"name":"MigrationOpen","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldRelayHub","type":"address"},{"indexed":true,"internalType":"address","name":"newRelayHub","type":"address"}],"name":"RelayHubChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newAddress","type":"address"}],"name":"StormXReserveSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"newToken","type":"uint256"}],"name":"TokenConverted","type":"event"},{"constant":true,"inputs":[],"name":"MIGRATION_TIME","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"relay","type":"address"},{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes","name":"encodedFunction","type":"bytes"},{"internalType":"uint256","name":"transactionFee","type":"uint256"},{"internalType":"uint256","name":"gasPrice","type":"uint256"},{"internalType":"uint256","name":"gasLimit","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"bytes","name":"approvalData","type":"bytes"},{"internalType":"uint256","name":"maxPossibleCharge","type":"uint256"}],"name":"acceptRelayedCall","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"chargeFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"convert","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"reserve","type":"address"}],"name":"disableMigration","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getHubAddr","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"initializeTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"initialized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"migrationOpen","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"newToken","outputs":[{"internalType":"contract StormXToken","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"oldToken","outputs":[{"internalType":"contract StormToken","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes","name":"context","type":"bytes"},{"internalType":"bool","name":"success","type":"bool"},{"internalType":"uint256","name":"actualCharge","type":"uint256"},{"internalType":"bytes32","name":"preRetVal","type":"bytes32"}],"name":"postRelayedCall","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes","name":"context","type":"bytes"}],"name":"preRelayedCall","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"relayHubVersion","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"newFee","type":"uint256"}],"name":"setChargeFee","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newReserve","type":"address"}],"name":"setStormXReserve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"stormXReserve","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"token","outputs":[{"internalType":"contract IStormXToken","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOldTokenOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000d0a4b8946cb52f0661273bfbc6fd0e0c75fc6433000000000000000000000000be9375c6a420d2eeb258962efb95551a5b722803000000000000000000000000b6b3774d98c24e8ef922493ac71c3aa4b2ec83ed

-----Decoded View---------------
Arg [0] : _oldToken (address): 0xD0a4b8946Cb52f0661273bfbC6fD0E0C75Fc6433
Arg [1] : _newToken (address): 0xbE9375C6a420D2eEB258962efB95551A5b722803
Arg [2] : reserve (address): 0xB6b3774D98c24E8Ef922493Ac71c3Aa4B2EC83ed

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000d0a4b8946cb52f0661273bfbc6fd0e0c75fc6433
Arg [1] : 000000000000000000000000be9375c6a420d2eeb258962efb95551a5b722803
Arg [2] : 000000000000000000000000b6b3774d98c24e8ef922493ac71c3aa4b2ec83ed


Deployed ByteCode Sourcemap

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Swarm Source

bzzr://3e5bed969fc2486b4563bb9374460894cdb71175d8cc25eac5b3783938168b20
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.