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| // SPDX-License-Identifier: SimPL-2.0
pragma solidity ^0.8.10;
interface IERC721Receiver{
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
contract Cafe721 {
using SafeMath for uint256;
//creator
address private contractCreator;
// name
string private _name;
// symbol
string private _symbol;
// Token
struct Cafe {
address creator;
address owner;
address approved;
bytes32 summary;
string uri;
}
// all Cafe
mapping (uint256 => Cafe) allCafe;
// cafe's counts
uint256 _totalCafe;
// User
struct User {
uint256[] cafes;
uint256 totalCafe;
}
// all user
mapping (address => User) allUser;
// operator approvals
mapping (address => mapping (address => bool)) operatorApprovals;
constructor(string memory name_, string memory symbol_){
contractCreator = theSender();
_name = name_;
_symbol = symbol_;
}
event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);
event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId);
event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);
/*
* the address have how much tokens
*/
function balanceOf(address _owner) external view returns (uint256 balance) {
return allUser[_owner].totalCafe;
}
function cafesOf(address _owner) external view returns (uint256[] memory cafes){
return allUser[_owner].cafes;
}
/*
* the token's owner
*/
function ownerOf(uint256 _tokenId) external view returns (address owner) {
return allCafe[_tokenId].owner;
}
function creatorOf(uint256 _tokenId) external view returns (address creator) {
return allCafe[_tokenId].creator;
}
// trans begin
function transferFrom(address _from, address _to, uint256 _tokenId) public returns (bool success) {
// checked token
require(exists(_tokenId), "Cafe721: the cafe is not exists");
// checked addr
require(zeroAddr(_from), "Cafe721: can not from the zero address");
require(zeroAddr(_to), "Cafe721: can not to the zero address");
// checked permission
require(isApprovedOrOwner(_tokenId), "Cafe721: no permission");
// remove cafe
remove(_from, _tokenId);
// transfer cafe
allCafe[_tokenId].owner = _to;
allCafe[_tokenId].approved = address(0);
// add cafe
allUser[_to].cafes.push(_tokenId);
allUser[_to].totalCafe = allUser[_to].totalCafe.add(1);
emit Transfer(_from, _to, _tokenId);
return true;
}
function safeTransferFrom(address _from, address _to, uint256 _tokenId) external virtual returns (bool success) {
return safeTransferFrom(_from, _to, _tokenId, "");
}
function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes memory _data) public virtual returns (bool success) {
require(isApprovedOrOwner(_tokenId), "Cafe721: no permission");
transferFrom(_from, _to, _tokenId);
require(checkOnERC721Received(_from, _to, _tokenId, _data), "Cafe721: transfer to non ERC721Receiver implementer");
return true;
}
// trans end
function approve(address _approved, uint256 _tokenId) external returns (bool success) {
require(allCafe[_tokenId].owner == theSender(), "Cafe721: no permission");
require(_approved != theSender(), "Cafe721: can not approved for owner");
allCafe[_tokenId].approved = _approved;
emit Approval(theSender(), _approved, _tokenId);
return true;
}
function setApprovalForAll(address _operator, bool _approved) external returns (bool success) {
require(_operator != theSender(), "Cafe721: can not approved for owner");
operatorApprovals[theSender()][_operator] = _approved;
emit ApprovalForAll(theSender(), _operator, _approved);
return true;
}
function getApproved(uint256 _tokenId) private view returns(address) {
return allCafe[_tokenId].approved;
}
function isApprovedForAll(address _owner, address _operator) public view returns (bool) {
return operatorApprovals[_owner][_operator];
}
function name() external view returns (string memory) {
return _name;
}
function symbol() external view returns (string memory) {
return _symbol;
}
function tokenURI(uint256 _tokenId) external view returns (string memory uri) {
return allCafe[_tokenId].uri;
}
function tokenSummary(uint256 _tokenId) external view returns (bytes32 summary) {
return allCafe[_tokenId].summary;
}
function totalSupply() external view returns (uint256 totalCafe) {
return _totalCafe;
}
function exists(uint256 _tokenId) internal view returns (bool){
return allCafe[_tokenId].owner != address(0);
}
function zeroAddr(address addr) private pure returns (bool) {
return addr != address(0);
}
function remove(address _from, uint256 _tokenId) private {
uint[] storage cafes = allUser[_from].cafes;
for (uint i = 0; i < cafes.length - 1; i++){
if(cafes[i] == _tokenId){
cafes[i] = cafes[cafes.length + 1];
break;
}
}
delete cafes[cafes.length - 1];
cafes.pop();
allUser[_from].cafes = cafes;
allUser[_from].totalCafe = allUser[_from].totalCafe.sub(1);
}
/*
* address owner;
* address approved;
* bytes32 summary;
* string uri;
*/
function mint(uint256 _tokenId, bytes32 _summary, string memory _uri) external {
require(allCafe[_tokenId].creator == address(0), "Cafe721: the cafe is exists.");
allCafe[_tokenId].creator = theSender();
allCafe[_tokenId].owner = theSender();
allCafe[_tokenId].approved = address(0);
allCafe[_tokenId].summary = _summary;
allCafe[_tokenId].uri = _uri;
// User
allUser[theSender()].cafes.push(_tokenId);
allUser[theSender()].totalCafe = allUser[theSender()].totalCafe.add(1);
_totalCafe = _totalCafe.add(1);
}
function isApprovedOrOwner(uint256 _tokenId) private view returns (bool) {
require(exists(_tokenId), "Cafe721: the cafe is exists.");
return (theSender() == allCafe[_tokenId].owner || isApprovedForAll(allCafe[_tokenId].owner, theSender()) || getApproved(_tokenId) == theSender());
}
function checkOnERC721Received(address from,address to,uint256 tokenId,bytes memory _data) private returns (bool) {
if (to.code.length > 0) {
try IERC721Receiver(to).onERC721Received(theSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
// destroyCafe
function destroyCafe(uint256 _tokenId) external returns (bool success) {
require(allCafe[_tokenId].owner == theSender(), "Cafe721: no premission");
remove(theSender(), _tokenId);
delete allCafe[_tokenId];
_totalCafe = _totalCafe.sub(1);
return true;
}
function theSender() internal view returns (address) {
return msg.sender;
}
}
library SafeMath {
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 numbers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0); // Solidity only automatically asserts when dividing by 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 numbers, 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 numbers, 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 numbers 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;
}
}
|