pragma solidity ^0.5.0;

import "./IERC20.sol";
import "./SafeMath.sol";

/**
 * @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`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * 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 IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) public _balances;

    mapping (address => mapping (address => uint256)) public _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(msg.sender, 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 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        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 `value`.
     * - 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, msg.sender, _allowances[sender][msg.sender].sub(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 `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(msg.sender, spender, _allowances[msg.sender][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(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        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);
        _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 Destoys `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 value) internal {
        require(account != address(0), "ERC20: burn from the zero address");

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

    /**
     * @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 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

    /**
     * @dev Destoys `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, msg.sender, _allowances[account][msg.sender].sub(amount));
    }
}

pragma solidity ^0.5.0;
import "./ERC20.sol";

/**
 * @dev Extension of `ERC20` that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
contract ERC20Burnable is ERC20 {
    /**
     * @dev Destoys `amount` tokens from the caller.
     *
     * See `ERC20._burn`.
     */
    function burn(uint256 amount) public {
        _burn(msg.sender, amount);
    }

    /**
     * @dev See `ERC20._burnFrom`.
     */
    function burnFrom(address account, uint256 amount) public {
        _burnFrom(account, amount);
    }
}

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.
     *
     * > 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);
}

pragma solidity ^0.5.0; // solidity 0.5.2

import './ERC20.sol';
import './MultiOwnable.sol';
import './ERC20Burnable.sol';
/**
 * @title Lockable token
 */
contract LockableToken is ERC20, MultiOwnable, ERC20Burnable {
    bool public locked = true;
    uint256 public constant LOCK_MAX = uint256(-1);

    /**
     * dev 락 상태에서도 거래 가능한 언락 계정
     */
    mapping(address => bool) public unlockAddrs;
    /**
     * dev 계정 별로 lock value 만큼 잔고가 잠김
     * dev - 값이 0 일 때 : 잔고가 0 이어도 되므로 제한이 없는 것임.
     * dev - 값이 LOCK_MAX 일 때 : 잔고가 uint256 의 최대값이므로 아예 잠긴 것임.
     */
    mapping(address => uint256) public lockValues;

    event Locked(bool locked, string note);
    event LockedTo(address indexed addr, bool locked, string note);
    event SetLockValue(address indexed addr, uint256 value, string note);

    constructor() public {
        unlockTo(msg.sender,  "");
    }

    modifier checkUnlock (address addr, uint256 value) {
        require(!locked || unlockAddrs[addr], "The account is currently locked.");
        require(_balances[addr].sub(value) >= lockValues[addr], "Transferable limit exceeded. Check the status of the lock value.");
        _;
    }

    function lock(string memory note) onlyOwner public {
        locked = true;
        emit Locked(locked, note);
    }

    function unlock(string memory note) onlyOwner public {
        locked = false;
        emit Locked(locked, note);
    }

    function lockTo(address addr, string memory note) onlyOwner public {
        setLockValue(addr, LOCK_MAX, note);
        unlockAddrs[addr] = false;

        emit LockedTo(addr, true, note);
    }

    function unlockTo(address addr, string memory note) onlyOwner public {
        if (lockValues[addr] == LOCK_MAX)
            setLockValue(addr, 0, note);
        unlockAddrs[addr] = true;

        emit LockedTo(addr, false, note);
    }

    function setLockValue(address addr, uint256 value, string memory note) onlyOwner public {
        lockValues[addr] = value;
        emit SetLockValue(addr, value, note);
    }

    /**
     * dev 이체 가능 금액을 조회한다.
     */
    function getMyUnlockValue() public view returns (uint256) {
        address addr = msg.sender;
        if ((!locked || unlockAddrs[addr]) && _balances[addr] > lockValues[addr])
            return _balances[addr].sub(lockValues[addr]);
        else
            return 0;
    }

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

    function transferFrom(address from, address to, uint256 value) checkUnlock(from, value) public returns (bool) {
        return super.transferFrom(from, to, value);
    }
    
    function burn(uint256 amount) onlyOwner public {
        return super.burn(amount);
    }
    
    function burnFrom(address account, uint256 amount) onlyOwner public {
        return super.burnFrom(account,amount);
    }
    
}

pragma solidity ^0.5.0; // solidity 0.5.2

import "./SafeMath.sol";

/**
 * @title MultiOwnable
 * dev
 */
contract MultiOwnable {
    using SafeMath for uint256;

    address public root; // 혹시 몰라 준비해둔 superOwner 의 백업. 하드웨어 월렛 주소로 세팅할 예정.
    address public superOwner;
    mapping (address => bool) public owners;
    address[] public ownerList;

    // for changeSuperOwnerByDAO
    // mapping(address => mapping (address => bool)) public preSuperOwnerMap;
    mapping(address => address) public candidateSuperOwnerMap;


    event ChangedRoot(address newRoot);
    event ChangedSuperOwner(address newSuperOwner);
    event AddedNewOwner(address newOwner);
    event DeletedOwner(address deletedOwner);

    constructor() public {
        root = msg.sender;
        superOwner = msg.sender;
        owners[root] = true;

        ownerList.push(msg.sender);

    }

    modifier onlyRoot() {
        require(msg.sender == root, "Root privilege is required.");
        _;
    }

    modifier onlySuperOwner() {
        require(msg.sender == superOwner, "SuperOwner priviledge is required.");
        _;
    }

    modifier onlyOwner() {
        require(owners[msg.sender], "Owner priviledge is required.");
        _;
    }

    /**
     * dev root 교체 (root 는 root 와 superOwner 를 교체할 수 있는 권리가 있다.)
     * dev 기존 루트가 관리자에서 지워지지 않고, 새 루트가 자동으로 관리자에 등록되지 않음을 유의!
     */
    function changeRoot(address newRoot) onlyRoot public returns (bool) {
        require(newRoot != address(0), "This address to be set is zero address(0). Check the input address.");

        root = newRoot;

        emit ChangedRoot(newRoot);
        return true;
    }

    /**
     * dev superOwner 교체 (root 는 root 와 superOwner 를 교체할 수 있는 권리가 있다.)
     * dev 기존 superOwner 가 관리자에서 지워지지 않고, 새 superOwner 가 자동으로 관리자에 등록되지 않음을 유의!
     */
    function changeSuperOwner(address newSuperOwner) onlyRoot public returns (bool) {
        require(newSuperOwner != address(0), "This address to be set is zero address(0). Check the input address.");

        superOwner = newSuperOwner;

        emit ChangedSuperOwner(newSuperOwner);
        return true;
    }

    /**
     * dev owner 들의 1/2 초과가 합의하면 superOwner 를 교체할 수 있다.
     */
    function changeSuperOwnerByDAO(address newSuperOwner) onlyOwner public returns (bool) {
        require(newSuperOwner != address(0), "This address to be set is zero address(0). Check the input address.");
        require(newSuperOwner != candidateSuperOwnerMap[msg.sender], "You have already voted for this account.");

        candidateSuperOwnerMap[msg.sender] = newSuperOwner;

        uint8 votingNumForSuperOwner = 0;
        uint8 i = 0;

        for (i = 0; i < ownerList.length; i++) {
            if (candidateSuperOwnerMap[ownerList[i]] == newSuperOwner)
                votingNumForSuperOwner++;
        }

        if (votingNumForSuperOwner > ownerList.length / 2) { // 과반수 이상이면 DAO 성립 => superOwner 교체
            superOwner = newSuperOwner;

            // 초기화
            for (i = 0; i < ownerList.length; i++) {
                delete candidateSuperOwnerMap[ownerList[i]];
            }

            emit ChangedSuperOwner(newSuperOwner);
        }

        return true;
    }

    function newOwner(address owner) onlySuperOwner public returns (bool) {
        require(owner != address(0), "This address to be set is zero address(0). Check the input address.");
        require(!owners[owner], "This address is already registered.");

        owners[owner] = true;
        ownerList.push(owner);

        emit AddedNewOwner(owner);
        return true;
    }

    function deleteOwner(address owner) onlySuperOwner public returns (bool) {
        require(owners[owner], "This input address is not a super owner.");
        delete owners[owner];

        for (uint256 i = 0; i < ownerList.length; i++) {
            if (ownerList[i] == owner) {
                ownerList[i] = ownerList[ownerList.length.sub(1)];
                ownerList.length = ownerList.length.sub(1);
                break;
            }
        }

        emit DeletedOwner(owner);
        return true;
    }
}

pragma solidity ^0.5.0; // solidity 0.5.2

import './LockableToken.sol';

contract MyToken is LockableToken {
  string public constant name = "FANZY EXCHANGE";
  string public constant symbol = "FX";
  uint public constant decimals = 18; // 소수점 18자리
  uint public constant INITIAL_SUPPLY = 7000000000 * 10 ** decimals; // 초기 발행량

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

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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

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