wDEFI Token
Woonkly DEFI
https://bscscan.com/token/0x291083c8aedfc3cd0384494e1fcdcf2067d28d3e%0A%0Ahttps://github.com/Woonkly/wDEFI_Token
bscscan.com
/* Submitted for verification at BscScan.com on 2021-05-11 */
// SPDX-License-Identifier: MIT pragma solidity 0.6.12;
/**
    @dev Wrappers over Solidity's arithmetic operations with added overflow
    checks.
    *
    Arithmetic operations in Solidity wrap on overflow. This can easily result
    in bugs, because programmers usually assume that an overflow raises an
    error, which is the standard behavior in high level programming languages.
    SafeMath restores this intuition by reverting the transaction when an
    operation overflows.
    *
    Using this library instead of the unchecked operations eliminates an entire
    class of bugs, so it's recommended to use it always. / library SafeMath { /*
      @dev Returns the addition of two unsigned integers, reverting on
      overflow.
      *
      Counterpart to Solidity's + operator.
      *
      Requirements:
      *
        Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow");
        return c; }
      /**
      @dev Returns the subtraction of two unsigned integers, reverting on
      overflow (when the result is negative).
      *
      Counterpart to Solidity's - operator.
      *
      Requirements:
      *
        Subtraction cannot overflow.
        */
        function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
        }
      /**
      @dev Returns the subtraction of two unsigned integers, reverting with custom message on
      overflow (when the result is negative).
      *
      Counterpart to Solidity's - operator.
      *
      Requirements:
      *
        Subtraction cannot overflow. */ 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. / function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { 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.
        */
        function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
        }
        }
/**
    @title Roles
    @dev Library for managing addresses assigned to a Role. */ library Roles { struct Role { mapping (address => bool) bearer; }
    /**
      @dev Give an account access to this role. */ function add(Role storage role, address account) internal { require(!has(role, account), "Roles: account already has role"); role.bearer[account] = true; }
      /**
      @dev Remove an account's access to this role. */ function remove(Role storage role, address account) internal { require(has(role, account), "Roles: account does not have role"); role.bearer[account] = false; }
      /**
      @dev Check if an account has this role.
      @return bool
      */
      function has(Role storage role, address account) internal view returns (bool) {
      require(account != address(0), "Roles: account is the zero address");
      return role.bearer[account];
      }
      }
/**
    @title MinterRole
    @dev Implementation of the {MinterRole} interface. */ contract MinterRole { using Roles for Roles.Role;
    event MinterAdded(address indexed account); event MinterRemoved(address indexed account);
    Roles.Role private _minters;
    constructor () internal { _addMinter(msg.sender); }
    modifier onlyMinter() { require(isMinter(msg.sender), "MinterRole: caller does not have the Minter role"); _; }
    function isMinter(address account) public view returns (bool) { return _minters.has(account); }
    function addMinter(address account) public onlyMinter { _addMinter(account); }
    function removeMinter(address account) public onlyMinter { _removeMinter(account); }
    function renounceMinter() public { _removeMinter(msg.sender); }
    function _addMinter(address account) internal { _minters.add(account); emit MinterAdded(account); }
    function _removeMinter(address account) internal { _minters.remove(account); emit MinterRemoved(account); } }
/*
    @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; } }
/**
    @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 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;
      }
      }
interface IBEP20 { /**
    @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256);
    /**
    @dev Returns the token decimals. */ function decimals() external view returns (uint8);
    /**
    @dev Returns the token symbol. */ function symbol() external view returns (string memory);
    /**
    @dev Returns the token name. */ function name() external view returns (string memory);
    /**
    @dev Returns the bep token owner. */ function getOwner() external view returns (address);
    /**
    @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:
    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);
    }
/**
    @dev Implementation of the {IBEP20} 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 {BEP20PresetMinterPauser}.
    *
    TIP: For a detailed writeup see our guide
    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 BEP20 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 {IBEP20-approve}. */ contract BEP20 is Context, IBEP20, Ownable { 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, uint8 decimals) public { _name = name; _symbol = symbol; _decimals = decimals; }
      /**
      @dev Returns the bep token owner. */ function getOwner() external override view returns (address) { return owner(); }
      /**
      @dev Returns the name of the token. */ function name() public override view returns (string memory) { return _name; }
      /**
      @dev Returns the symbol of the token, usually a shorter version of the
      name. */ function symbol() public override view returns (string memory) { return _symbol; }
      /**
        @dev Returns the number of decimals used to get its user representation.
        */
        function decimals() public override view returns (uint8) {
        return _decimals;
        }
      /**
      @dev See {BEP20-totalSupply}. */ function totalSupply() public override view returns (uint256) { return _totalSupply; }
      /**
      @dev See {BEP20-balanceOf}. */ function balanceOf(address account) public override view returns (uint256) { return _balances[account]; }
      /**
      @dev See {BEP20-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 override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
        }
      /**
      @dev See {BEP20-allowance}. */ function allowance(address owner, address spender) public override view returns (uint256) { return _allowances[owner][spender]; }
      /**
      @dev See {BEP20-approve}.
      *
      Requirements:
      *
        spender cannot be the zero address.
        */
        function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
        }
      /**
      @dev See {BEP20-transferFrom}.
      *
      Emits an {Approval} event indicating the updated allowance. This is not
      required by the EIP. See the note at the beginning of {BEP20};
      *
      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 override returns (bool) { _transfer(sender, recipient, amount); _approve( sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, 'BEP20: 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 {BEP20-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 {BEP20-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, 'BEP20: decreased allowance below zero')); return true; }
      /**
      @dev Creates amount tokens and assigns them to msg.sender, increasing
      the total supply.
      *
      Requirements
      *
        msg.sender must be the token owner
        */
        function mint(uint256 amount) public onlyOwner returns (bool) {
        _mint(_msgSender(), amount);
        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), 'BEP20: transfer from the zero address'); require(recipient != address(0), 'BEP20: transfer to the zero address');
        _balances[sender] = _balances[sender].sub(amount, 'BEP20: 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), 'BEP20: 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), 'BEP20: burn from the zero address');
        _balances[account] = _balances[account].sub(amount, 'BEP20: burn amount exceeds balance'); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); }
      /**
      @dev Sets amount as the allowance of spender over the owners 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), 'BEP20: approve from the zero address'); require(spender != address(0), 'BEP20: 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, 'BEP20: burn amount exceeds allowance'));
      }
      }
// WDEFIToken contract WDEFIToken is BEP20('Woonkly Defi', 'wDEFI', 18), MinterRole {
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function approve(address owner, address spender, uint256 amount) public onlyOwner {
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_approve(owner, spender, amount);
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}
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/// @notice Creates `_amount` token to `_to`. Must only be called by the owner.
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function mint(address _to, uint256 _amount) public onlyMinter {
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_mint(_to, _amount);
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}
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/// @notice Bunrs `_amount` token fromo `_from`. Must only be called by the owner.
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function burn(address _from, uint256 _amount) public onlyOwner {
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_burn(_from, _amount);
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}
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/// @notice Presale `_amount` token to `_to`. Must only be called by the minter.
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function presale(address _to, uint256 _amount) public onlyMinter {
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_transfer(address(this), _to, _amount);
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}
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