// 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;
}
}
//
interface IGRAPWine {
function mint(address _to, uint256 _id, uint256 _quantity, bytes memory _data) external ;
function totalSupply(uint256 _id) external view returns (uint256);
function maxSupply(uint256 _id) external view returns (uint256);
function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _amount, bytes calldata _data) external;
}
//
/**
* @title WineTrade
*/
contract WineTrader {
using SafeMath for uint256;
// Wine token.
IGRAPWine GRAPWine;
address payable public dev;
// Info of each order.
struct WineOrderInfo {
address payable owner; // owner
uint256 price; // price
uint256 wineID; // wineID
bool isOpen; // open order
}
// Info of each order list.
WineOrderInfo[] public orderList;
uint256 private _currentOrderID = 0;
event Order(uint256 indexed orderID, address indexed user, uint256 indexed wid, uint256 price);
event Cancel(uint256 indexed orderID, address indexed user, uint256 indexed wid);
event Buy(uint256 indexed orderID, address indexed user, uint256 indexed wid);
constructor(
IGRAPWine _GRAPWine
) public {
GRAPWine = _GRAPWine;
dev = msg.sender;
orderList.push(WineOrderInfo({
owner: address(0),
price: 0,
wineID: 0,
isOpen: false
}));
}
function withdrawFee() external {
require(msg.sender == dev, "only dev");
dev.transfer(address(this).balance);
}
function orderWine(uint256 _wineID, uint256 _price) external {
// transferFrom
GRAPWine.safeTransferFrom(msg.sender, address(this), _wineID, 1, "");
orderList.push(WineOrderInfo({
owner: msg.sender,
price: _price,
wineID: _wineID,
isOpen: true
}));
uint256 _id = _getNextOrderID();
_incrementOrderId();
emit Order(_id, msg.sender, _wineID, _price);
}
function cancel(uint256 orderID) external {
WineOrderInfo storage orderInfo = orderList[orderID];
require(orderInfo.owner == msg.sender, "not your order");
require(orderInfo.isOpen == true, "only open order can be cancel");
orderInfo.isOpen = false;
// transferFrom
GRAPWine.safeTransferFrom(address(this), msg.sender, orderInfo.wineID, 1, "");
emit Cancel(orderID, msg.sender, orderInfo.wineID);
}
function buyWine(uint256 orderID) external payable {
WineOrderInfo storage orderInfo = orderList[orderID];
require(orderInfo.owner != address(0),"bad address");
require(orderInfo.owner != msg.sender, "it is your order");
require(orderInfo.isOpen == true, "only open order can buy");
require(msg.value == orderInfo.price, "error price");
// 3% fee
uint256 sellerValue = msg.value.mul(97).div(100);
orderInfo.isOpen = false;
// transferFrom
GRAPWine.safeTransferFrom(address(this), msg.sender, orderInfo.wineID, 1, "");
orderInfo.owner.transfer(sellerValue);
emit Buy(orderID, msg.sender, orderInfo.wineID);
}
function _getNextOrderID() private view returns (uint256) {
return _currentOrderID.add(1);
}
function _incrementOrderId() private {
_currentOrderID++;
}
function onERC1155Received(address _operator, address _from, uint256 _id, uint256 _value, bytes calldata _data) external returns(bytes4){
return bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"));
}
}
{
"compilationTarget": {
"WineTrader.sol": "WineTrader"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 50000
},
"remappings": []
}
[{"inputs":[{"internalType":"contract IGRAPWine","name":"_GRAPWine","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"orderID","type":"uint256"},{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"wid","type":"uint256"}],"name":"Buy","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"orderID","type":"uint256"},{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"wid","type":"uint256"}],"name":"Cancel","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"orderID","type":"uint256"},{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"wid","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"}],"name":"Order","type":"event"},{"inputs":[{"internalType":"uint256","name":"orderID","type":"uint256"}],"name":"buyWine","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"orderID","type":"uint256"}],"name":"cancel","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dev","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_operator","type":"address"},{"internalType":"address","name":"_from","type":"address"},{"internalType":"uint256","name":"_id","type":"uint256"},{"internalType":"uint256","name":"_value","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"orderList","outputs":[{"internalType":"address payable","name":"owner","type":"address"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"wineID","type":"uint256"},{"internalType":"bool","name":"isOpen","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_wineID","type":"uint256"},{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"orderWine","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawFee","outputs":[],"stateMutability":"nonpayable","type":"function"}]