Contract Address Details

// SPDX-License-Identifier: No License (None)
pragma solidity ^0.8.0;

library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

interface IERC223 {
  /**
   * @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 token standard.
  */
  function standard() external pure 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);

  function transfer(address recipient, uint256 amount, bytes calldata data) 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);
  
  event TransferData(bytes data);

  /**
   * @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);
}

interface IERC223Recipient {
    function tokenReceived(address _from, uint _value, bytes calldata _data) external;
}


contract Ownable {
  address internal _owner;

  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  /**
   * @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 == msg.sender, "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 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;
  }
}


contract ERC223TokenCloned is Ownable, IERC223 {
  using Address for address;

  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowances;

  uint256 private _totalSupply;
  uint8 private _decimals;
  string private _symbol;
  string private _name;

  bool private _isInitialized;
  address public minter;
  event SetMinter(address previousMinter, address newMinter);
  event RescuedERC20(address token, address to, uint256 value);
  
  /**
   * @dev Throws if called by any account other than the minter.
   */
  modifier onlyMinter() {
    require(msg.sender == minter, "Caller is not admin");
    _;
  }

  // initialize contract. Used instead of constructor in cloned contract
  function initialize(address newOwner, string calldata name_, string calldata symbol_, uint8 decimals_) external {
    require(!_isInitialized, "Already Initialized");
    _isInitialized = true;
    minter = msg.sender;  // set bridge as minter
    emit SetMinter(address(0), minter);
    _name = name_;
    _symbol = symbol_;
    _decimals = decimals_;
    _owner = newOwner;
    emit OwnershipTransferred(address(0), newOwner);
  }

/* 
  // allow owner to change minter (bridge)
  function setMinter(address newMinter) external onlyOwner {
    minter = newMinter;
    emit SetMinter(address(0), minter);
  }
*/  
  /**
   * @dev Mint tokens to user in amount of his deposit. Used by bridge to mint wrapped tokens
   * @param user - address of user's wallet
   * @param amount - amount of token to mint (should be equivalent of USDT amount of deposit)
   */
  function mint(address user, uint256 amount) external onlyMinter {
    _mint(user, amount);
  }

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external view override returns (address) {
    return owner();
  }

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external view override returns (uint8) {
    return _decimals;
  }

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external view override returns (string memory) {
    return _symbol;
  }

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

  /**
  * @dev Returns the token standard.
  */
  function standard() external pure override returns (string memory) {
    return "erc223";
  }

  /**
   * @dev See {ERC223-totalSupply}.
   */
  function totalSupply() external view override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {ERC223-balanceOf}.
   */
  function balanceOf(address account) external view override returns (uint256) {
    return _balances[account];
  }

  /**
   * @dev See {ERC223-transfer}.
   *
   * Requirements:
   *
   * - `recipient` cannot be the zero address.
   * - the caller must have a balance of at least `amount`.
   */
  function transfer(address recipient, uint amount) external override returns (bool) {
    bytes memory _empty = hex"00000000";
    _transfer(msg.sender, recipient, amount);
    
    if(recipient.isContract()) {
      IERC223Recipient(recipient).tokenReceived(msg.sender, amount, _empty);
    }
    emit TransferData(_empty);
    return true;
  }
  
  function transfer(address recipient, uint amount, bytes calldata data) external override returns (bool) {
    _transfer(msg.sender, recipient, amount);
    if(recipient.isContract()) {
      IERC223Recipient(recipient).tokenReceived(msg.sender, amount, data);
    }
    emit TransferData(data);
    return true;
  }
  
  /**
   * @dev See {ERC223-allowance}.
   */
  function allowance(address owner, address spender) external view override returns (uint256) {
    return _allowances[owner][spender];
  }

  /**
   * @dev See {ERC223-approve}.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function approve(address spender, uint256 amount) external override returns (bool) {
    _approve(msg.sender, spender, amount);
    return true;
  }

  /**
   * @dev See {ERC223-transferFrom}.
   *
   * Emits an {Approval} event indicating the updated allowance. This is not
   * required by the EIP. See the note at the beginning of {ERC223};
   *
   * 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) external override returns (bool) {
    _transfer(sender, recipient, amount);
    require(_allowances[sender][msg.sender] >= amount, "ERC223: transfer amount exceeds allowance");
    _approve(sender, msg.sender, _allowances[sender][msg.sender] - amount);
    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 {ERC223-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(msg.sender, spender, _allowances[msg.sender][spender] + 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 {ERC223-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) {
    uint256 newAllawnce;
    if(_allowances[spender][msg.sender] > subtractedValue) {
      newAllawnce = _allowances[msg.sender][spender] - subtractedValue;
    }
    _approve(msg.sender, spender, newAllawnce);
    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), "ERC223: transfer from the zero address");
    require(recipient != address(0), "ERC223: transfer to the zero address");
    require(_balances[sender] >= amount, "ERC223: transfer amount exceeds balance");
    _balances[sender] = _balances[sender] - amount;
    _balances[recipient] = _balances[recipient] + 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), "ERC223: mint to the zero address");

    _totalSupply = _totalSupply + amount;
    _balances[account] = _balances[account] + 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), "ERC223: burn from the zero address");
    require(_balances[account] >= amount, "ERC223: burn amount exceeds balance");
    _balances[account] = _balances[account] - amount;
    _totalSupply = _totalSupply - 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), "ERC223: approve from the zero address");
    require(spender != address(0), "ERC223: 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);
    require(_allowances[account][msg.sender] >= amount, "ERC223: transfer amount exceeds allowance");
    _approve(account, msg.sender, _allowances[account][msg.sender] - amount);
  }

  function burnFrom(address account, uint256 amount) external returns(bool) {
    _burnFrom(account, amount);
    return true;
  }

  function burn(uint256 amount) external returns(bool) {
    _burn(msg.sender, amount);
    return true;
  }

  // allow owner to rescue ERC20 tokens from contract
  function rescueERC20(address token, address to) external onlyOwner {
    uint256 value = IERC223(token).balanceOf(address(this));
    safeTransfer(token, to, value);
    emit RescuedERC20(token, to, value);
  }

  function safeTransfer(address token, address to, uint value) internal {
    // bytes4(keccak256(bytes('transfer(address,uint256)')));
    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
    require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
  }
}