Token

/**
 *Submitted for verification at Etherscan.io on 2019-03-28
*/

/// @author robinjoo1015 & njw1204

pragma solidity ^0.5.0;

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address internal _owner;

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

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @return the address of the owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner());
        _;
    }

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     * @notice 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 Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on 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-solidity/pull/522
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

contract BaseTokenInterface {
  event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);

  function balanceOf(address _owner) public view returns (uint256 _balance);
  function ownerOf(uint256 _tokenId) public view returns (address _owner);
  function transfer(address _to, uint256 _tokenId) public;
}

contract ExtraTokenInterface is BaseTokenInterface {
    struct App {
        uint256 tokenId;
        string name;
        string comment;
        string url;
        uint256 validTime;
        address seller;
    }

    uint256 public totalSupply = 0; // total app count
    mapping (uint256 => App) public app; // store all apps based on tokenId

    mapping (uint256 => address) internal ownerOfApp; // store the app's owner
    mapping (address => uint256) internal ownerAppCount; // store the number of the owner's apps
    mapping (address => uint256[]) public appsOfOwner; // store the owner's apps
    mapping (address => mapping (uint256 => uint256)) internal appsOfOwnerIndex;

    mapping (address => uint256) public sellerAppCount;
    mapping (address => uint256[]) public appsOfSeller; // store the seller's apps
    mapping (address => mapping (uint256 => uint256)) internal appsOfSellerIndex;

    function transferToMarket(address _from, uint256 _tokenId) public;
    function sellerOf(uint256 _tokenId) public view returns (address _seller);
    function createApp(string memory _name, string memory _comment, string memory _url, uint256 _validTime) public;
    function changeSeller(address _to, uint256 _tokenId) public;
    function changeValidTime(uint256 _tokenId, uint256 _newValidTime) public;
    function changeName(uint256 _tokenId, string memory _newName) public;
    function changeComment(uint256 _tokenId, string memory _newComment) public;
    function changeUrl(uint256 _tokenId, string memory _newUrl) public;
}

contract AppToken is ExtraTokenInterface, Ownable {
    using SafeMath for uint256;

    address public marketAddress = address(0);

    event ChangeSeller(uint256 indexed tokenId, address from, address to);
    event ChangeValidTime(uint256 indexed tokenId, uint256 newValidTime);

    function balanceOf(address _owner) public view returns (uint256 _balance) {
        return ownerAppCount[_owner];
    }

    function ownerOf(uint256 _tokenId) public view returns (address _owner) {
        return ownerOfApp[_tokenId];
    }

    function sellerOf(uint256 _tokenId) public view returns (address _seller) {
        return app[_tokenId].seller;
    }

    function createApp(string memory _name, string memory _comment, string memory _url, uint256 _validTime) public {
        uint256 _tokenId = totalSupply.add(1);

        app[_tokenId] = App(_tokenId, _name, _comment, _url, _validTime, msg.sender); // create new app
        sellerAppCount[msg.sender] = sellerAppCount[msg.sender].add(1);
        // push to array of seller's apps
        appsOfSellerIndex[msg.sender][_tokenId] = appsOfSeller[msg.sender].length;
        appsOfSeller[msg.sender].push(_tokenId);
        _transfer(address(0), msg.sender, _tokenId); // transfer created app from 0 to msg.sender
    }

    function _transfer(address _from, address _to, uint256 _tokenId) private {
        require(_from != _to && _to != address(0));

        if (_from != address(0)) {
            ownerAppCount[_from] = ownerAppCount[_from].sub(1);
            // remove element (set 0) at array of owner's apps
            delete appsOfOwner[_from][appsOfOwnerIndex[_from][_tokenId]];
            delete appsOfOwnerIndex[_from][_tokenId];
        }
        else {
            // create new app
            totalSupply = totalSupply.add(1);
        }

        ownerOfApp[_tokenId] = _to;
        ownerAppCount[_to] = ownerAppCount[_to].add(1);
        // push to array of owner's apps
        appsOfOwnerIndex[_to][_tokenId] = appsOfOwner[_to].length;
        appsOfOwner[_to].push(_tokenId);
        emit Transfer(_from, _to, _tokenId);
    }

    function transfer(address _to, uint256 _tokenId) public {
        require(msg.sender == ownerOf(_tokenId));
        _transfer(msg.sender, _to, _tokenId);
    }

    function transferToMarket(address _from, uint256 _tokenId) public {
        require(_from == ownerOf(_tokenId) && msg.sender == marketAddress);
        _transfer(_from, marketAddress, _tokenId);
    }

    function changeSeller(address _to, uint256 _tokenId) public {
        require(msg.sender == sellerOf(_tokenId) && _to != address(0));

        sellerAppCount[msg.sender] = sellerAppCount[msg.sender].sub(1);
        // remove element (set 0) at array of seller's apps
        delete appsOfSeller[msg.sender][appsOfSellerIndex[msg.sender][_tokenId]];
        delete appsOfSellerIndex[msg.sender][_tokenId];

        app[_tokenId].seller = _to;
        sellerAppCount[_to] = sellerAppCount[_to].add(1);
        // push to array of seller's apps
        appsOfSellerIndex[_to][_tokenId] = appsOfSeller[_to].length;
        appsOfSeller[_to].push(_tokenId);
        emit ChangeSeller(_tokenId, msg.sender, _to);
    }

    function changeValidTime(uint256 _tokenId, uint256 _newValidTime) public {
        require(msg.sender == sellerOf(_tokenId));
        app[_tokenId].validTime = _newValidTime;
        emit ChangeValidTime(_tokenId, _newValidTime);
    }

    function changeName(uint256 _tokenId, string memory _newName) public {
        require(msg.sender == sellerOf(_tokenId));
        app[_tokenId].name = _newName;
    }

    function changeComment(uint256 _tokenId, string memory _newComment) public {
        require(msg.sender == sellerOf(_tokenId));
        app[_tokenId].comment = _newComment;
    }

    function changeUrl(uint256 _tokenId, string memory _newUrl) public {
        require(msg.sender == sellerOf(_tokenId));
        app[_tokenId].url = _newUrl;
    }

    function changeMarketAddress(address _market) external onlyOwner {
        marketAddress = _market;
    }
}

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