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• library SafeMath
•    - function tryAdd(uint256 a, uint256 b)
•    - function trySub(uint256 a, uint256 b)
•    - function tryMul(uint256 a, uint256 b)
•    - function tryDiv(uint256 a, uint256 b)
•    - function tryMod(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b, st ...
•    - function div(uint256 a, uint256 b, st ...
•    - function mod(uint256 a, uint256 b, st ...
•    - function _msgSender()
•    - function _msgData()
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•  contract ERC20 is Context, IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function _transfer(address sender, ad ...
•    - function _mint(address account, uint2 ...
•    - function _burn(address account, uint2 ...
•    - function _approve(address owner, addr ...
•    - function _setupDecimals(uint8 decimal ...
•    - function _beforeTokenTransfer(address ...
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
• interface ISwapReceiver
•    - function swapMint(address _holder, ui ...
•    - function isSwapStarted()
•    - function canSwapTokens(address _addre ...
•    - function totalUnlockedAmountOfToken()
•    - function swapFor(ISwapReceiver _umb)
•    - function startEarlySwap()
• interface IBurnableToken
•    - function burn(uint256 _amount)
•    - function burn(uint256 _amount)
•    - function mint(address _holder, uint25 ...
•    - function airdropTokens(
•  contract UMB is MintableToken, Air ... *
•    - function setRewardTokens(address[] ca ...
•    - function swapMint(address _holder, ui ...

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/**
 *Submitted for verification at Etherscan.io on 2021-02-08
*/

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/utils/Context.sol


pragma solidity >=0.6.0 <0.8.0;

/*
 * @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.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual 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/IERC20.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol


pragma solidity >=0.6.0 <0.8.0;




/**
 * @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 {ERC20PresetMinterPauser}.
 *
 * 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;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * 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 virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual 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 virtual 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 virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _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 virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _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 virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _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 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 virtual {
        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 Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// File: @openzeppelin/contracts/access/Ownable.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * 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.
 */
abstract 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 virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/interfaces/Owned.sol

pragma solidity 0.7.5;


abstract contract Owned is Ownable {
    constructor(address _owner) {
        transferOwnership(_owner);
    }
}

// File: contracts/interfaces/ISwapReceiver.sol

pragma solidity 0.7.5;

interface ISwapReceiver {
    function swapMint(address _holder, uint256 _amount) external;
}

// File: contracts/interfaces/SwappableToken.sol

pragma solidity 0.7.5;

// Inheritance






/// @title   Umbrella Rewards contract
/// @author  umb.network
/// @notice  This contract serves Swap functionality for rewards tokens
/// @dev     It allows to swap itself for other token (main UMB token).
///          Swap can start 1y from deployment or can be triggered earlier by owner.
///          There is a daily limit for swapping so we can't swap all at once.
///          When swap is executing, this contract do not care about target token,
///          so target token should be responsible for all the check before he mint tokens for swap.
abstract contract SwappableToken is Owned, ERC20 {
    using SafeMath for uint256;

    uint256 public totalAmountToBeSwapped;
    uint256 public swappedSoFar;
    uint256 public swapStartsOn;
    uint256 public swapDuration;

    // ========== CONSTRUCTOR ========== //

    constructor(uint _totalAmountToBeSwapped, uint _swapDuration) {
        require(_totalAmountToBeSwapped != 0, "_totalAmountToBeSwapped is empty");
        require(_swapDuration != 0, "swapDuration is empty");

        totalAmountToBeSwapped = _totalAmountToBeSwapped;
        swapStartsOn = block.timestamp + 365 days;
        swapDuration = _swapDuration;
    }

    // ========== MODIFIERS ========== //

    // ========== VIEWS ========== //

    function isSwapStarted() public view returns (bool) {
        return block.timestamp >= swapStartsOn;
    }

    function canSwapTokens(address _address) public view returns (bool) {
        return balanceOf(_address) <= totalUnlockedAmountOfToken().sub(swappedSoFar);
    }

    function totalUnlockedAmountOfToken() public view returns (uint256) {
        if (block.timestamp < swapStartsOn)
            return 0;
        if (block.timestamp >= swapStartsOn.add(swapDuration)) {
            return totalSupply().add(swappedSoFar);
        } else {
            return totalSupply().add(swappedSoFar).mul(block.timestamp.sub(swapStartsOn)).div(swapDuration);
        }
    }

    // ========== MUTATIVE FUNCTIONS ========== //

    function swapFor(ISwapReceiver _umb) external {
        require(block.timestamp >= swapStartsOn, "swapping period has not started yet");

        uint amountToSwap = balanceOf(_msgSender());

        require(amountToSwap != 0, "you dont have tokens to swap");
        require(amountToSwap <= totalUnlockedAmountOfToken().sub(swappedSoFar), "your swap is over the limit");

        swappedSoFar = swappedSoFar.add(amountToSwap);

        _burn(_msgSender(), amountToSwap);
        _umb.swapMint(_msgSender(), amountToSwap);

        emit LogSwap(_msgSender(), amountToSwap);
    }

    // ========== PRIVATE / INTERNAL ========== //

    // ========== RESTRICTED FUNCTIONS ========== //

    function startEarlySwap() external onlyOwner {
        require(block.timestamp < swapStartsOn, "swap is already allowed");

        swapStartsOn = block.timestamp;
        emit LogStartEarlySwapNow(block.timestamp);
    }

    // ========== EVENTS ========== //

    event LogStartEarlySwapNow(uint time);
    event LogSwap(address indexed swappedTo, uint amount);
}

// File: contracts/interfaces/IBurnableToken.sol

pragma solidity 0.7.5;

interface IBurnableToken {
    function burn(uint256 _amount) external;
}

// File: contracts/interfaces/MintableToken.sol

pragma solidity 0.7.5;

// Inheritance





/// @title   Umbrella Rewards contract
/// @author  umb.network
/// @notice  This contract allows to mint tokens and burn key (renounceOwnership)
/// @dev     Can be use used with MultiSig as owner
abstract contract MintableToken is Owned, ERC20, IBurnableToken {
    using SafeMath for uint256;

    // ========== STATE VARIABLES ========== //

    uint256 public maxAllowedTotalSupply;

    // ========== CONSTRUCTOR ========== //

    constructor (uint256 _maxAllowedTotalSupply) {
        require(_maxAllowedTotalSupply != 0, "_maxAllowedTotalSupply is empty");
        maxAllowedTotalSupply = _maxAllowedTotalSupply;
    }

    // ========== MODIFIERS ========== //

    modifier assertMaxSupply(uint256 _amountToMint) {
        require(totalSupply().add(_amountToMint) <= maxAllowedTotalSupply, "total supply limit exceeded");
        _;
    }

    // ========== MUTATIVE FUNCTIONS ========== //

    function burn(uint256 _amount) override external {
        uint balance = balanceOf(msg.sender);
        require(_amount <= balance, "not enough tokens to burn");

        _burn(msg.sender, _amount);
        maxAllowedTotalSupply = maxAllowedTotalSupply - _amount;
    }

    // ========== RESTRICTED FUNCTIONS ========== //

    function mint(address _holder, uint256 _amount)
    external
    onlyOwner()
    assertMaxSupply(_amount) {
        require(_amount > 0, "zero amount");

        _mint(_holder, _amount);
    }
}

// File: contracts/interfaces/Airdrop.sol

pragma solidity 0.7.5;

// Inheritance


/// @title   Umbrella Airdrop contract
/// @author  umb.network
/// @notice  This contract provides Airdrop capability.
abstract contract Airdrop is ERC20 {
    function airdropTokens(
        address[] calldata _addresses,
        uint256[] calldata _amounts
    ) external {
        require(_addresses.length != 0, "there are no _addresses");
        require(_addresses.length == _amounts.length, "the number of _addresses should match _amounts");

        for(uint i = 0; i < _addresses.length; i++) {
            transfer(_addresses[i], _amounts[i]);
        }
    }
}

// File: contracts/UMB.sol

pragma solidity 0.7.5;

// import "@nomiclabs/buidler/console.sol";

// Inheritance








/// @title   Umbrella Rewards contract
/// @author  umb.network
/// @notice  This is main UMB token
///
/// @dev     Owner (multisig) can set list of rewards tokens rUMB. rUMBs can be swapped to UMB.
///          This token can be mint by owner eg we need UMB for auction. After that we can burn the key
///          so nobody can mint anymore.
///          It has limit for max total supply, so we need to make sure, total amount of rUMBs fit this limit.
contract UMB is MintableToken, Airdrop, ISwapReceiver {
    using SafeMath for uint256;

    // ========== STATE VARIABLES ========== //

    mapping(address => bool) rewardsTokens;

    // ========== CONSTRUCTOR ========== //

    constructor (
        address _owner,
        address _initialHolder,
        uint _initialBalance,
        uint256 _maxAllowedTotalSupply,
        string memory _name,
        string memory _symbol
    )
    Owned(_owner)
    ERC20(_name, _symbol)
    MintableToken(_maxAllowedTotalSupply) {
        if (_initialHolder != address(0) && _initialBalance != 0) {
            _mint(_initialHolder, _initialBalance);
        }
    }

    // ========== MODIFIERS ========== //

    // ========== MUTATIVE FUNCTIONS ========== //

    // ========== PRIVATE / INTERNAL ========== //

    // ========== RESTRICTED FUNCTIONS ========== //

    function setRewardTokens(address[] calldata _tokens, bool[] calldata _statuses)
    external
    onlyOwner {
        require(_tokens.length > 0, "please pass a positive number of reward tokens");
        require(_tokens.length == _statuses.length, "please pass same number of tokens and statuses");

        for (uint i = 0; i < _tokens.length; i++) {
            rewardsTokens[_tokens[i]] = _statuses[i];
        }

        emit LogSetRewardTokens(_tokens, _statuses);
    }

    function swapMint(address _holder, uint256 _amount) public override assertMaxSupply(_amount) {
        require(rewardsTokens[_msgSender()], "only reward token can be swapped");

        _mint(_holder, _amount);
    }

    // ========== EVENTS ========== //

    event LogSetRewardTokens(address[] tokens, bool[] statuses);
}

• No Contract Security Audit Submitted- Submit Audit Here

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:"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

-----Decoded View---------------
Arg [0] : _owner (address): 0xA6e4fFa19B213AbeA258ae72e8e1a209B9E543e7
Arg [1] : _initialHolder (address): 0x3601EC1e652a4Cc624c8C6FA74b00BdDaf5989fD
Arg [2] : _initialBalance (uint256): 5000000000000000000000000
Arg [3] : _maxAllowedTotalSupply (uint256): 500000000000000000000000000
Arg [4] : _name (string): Umbrella
Arg [5] : _symbol (string): UMB

-----Encoded View---------------
10 Constructor Arguments found :
Arg [0] : 000000000000000000000000a6e4ffa19b213abea258ae72e8e1a209b9e543e7
Arg [1] : 0000000000000000000000003601ec1e652a4cc624c8c6fa74b00bddaf5989fd
Arg [2] : 0000000000000000000000000000000000000000000422ca8b0a00a425000000
Arg [3] : 0000000000000000000000000000000000000000019d971e4fe8401e74000000
Arg [4] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [7] : 556d6272656c6c61000000000000000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [9] : 554d420000000000000000000000000000000000000000000000000000000000

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