Photon Milky Way

pragma solidity ^0.5.16;

contract Ownable {
    address private _owner;

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

    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(isOwner());
        _;
    }

    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

}

library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    function add(Role storage role, address account) internal {
        require(account != address(0));
        require(!has(role, account));

        role.bearer[account] = true;
    }

    function remove(Role storage role, address account) internal {
        require(account != address(0));
        require(has(role, account));

        role.bearer[account] = false;
    }

    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0));
        return role.bearer[account];
    }
}

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));
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(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);
    }
}

library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0);
        uint256 c = a / b;

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    mapping (address => uint) public lockedAccount;
    
    event Lock(address target, uint amount);
    event UnLock(address target, uint amount);

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address owner) public view returns (uint256) {
        return _balances[owner];
    }

    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowed[owner][spender];
    }

    function transfer(address to, uint256 value) public returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        _transfer(from, to, value);
        _approve(from, msg.sender, _allowed[from][msg.sender].sub(value));
        return true;
    }

    function lockAccount(uint amount) internal returns (bool) {
        lockAccount(msg.sender, amount);
        return true;
    }

    function unLockAccount(uint amount) internal returns (bool) {
        unLockAccount(msg.sender, amount);
        return true;
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _balances[from] = _balances[from].sub(amount);
        _balances[to] = _balances[to].add(amount);
        emit Transfer(from, to, amount);
    }

    function _mint(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.add(value);
        _balances[account] = _balances[account].add(value);
        emit Transfer(address(0), account, value);
    }

    function _approve(address owner, address spender, uint256 value) internal {
        require(spender != address(0));
        require(owner != address(0));

        _allowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function lockAccount(address account, uint amount) internal returns (bool) {
        require(account != address(0));
        require(_balances[account] >= amount);
        _balances[account] = _balances[account].sub(amount);
        lockedAccount[account] = lockedAccount[account].add(amount);
        emit Lock(account, lockedAccount[account]);

        return true;
    }

    function unLockAccount(address account, uint amount) internal returns (bool) {
        require(account != address(0));
        require(lockedAccount[account] >= amount);
        lockedAccount[account] = lockedAccount[account].sub(amount);
        _balances[account] = _balances[account].add(amount);
        emit UnLock(account, lockedAccount[account]);
        
        return true;
    }
}

contract ERC20Mintable is ERC20, MinterRole {
    function mint(address to, uint256 value) public onlyMinter returns (bool) {
        _mint(to, value);
        return true;
    }
}

contract PMWToken is ERC20Mintable, Ownable {
    string public constant name = "Photon Milky Way";
    string public constant symbol = "PMW";
    uint8 public constant decimals = 18;
    uint public constant initialSupply = 1000000000000000000000000000;

    mapping (address => bool) public frozenAccount;

    event Freeze(address target);
    event UnFreeze(address target);

    constructor() public {
        _mint(msg.sender, initialSupply);
    }

    function () external payable {
        revert();
    }

    function freezeAccount(address target) onlyOwner public {
        require(target != address(0));
        require(!frozenAccount[target]);
        frozenAccount[target] = true;
        emit Freeze(target);
    }

    function unFreezeAccount(address target) onlyOwner public {
        require(target != address(0));
        require(frozenAccount[target]);
        frozenAccount[target] = false;
        emit UnFreeze(target);
    }

    function transfer(address recipient, uint256 amount) public returns (bool) {
        require(!frozenAccount[msg.sender]);        // Check if sender is frozen
        require(!frozenAccount[recipient]);               // Check if recipient is frozen
        return super.transfer(recipient, amount);
    }

    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        require(!frozenAccount[msg.sender]);        // Check if approved is frozen
        require(!frozenAccount[sender]);             // Check if sender is frozen
        require(!frozenAccount[recipient]);               // Check if recipient is frozen
        return super.transferFrom(sender, recipient, amount);
    }
}

{
  "compilationTarget": {
    "PMWToken.sol": "PMWToken"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}