Solidity gyakorlatozgatások
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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.11;
contract SafuDotNFT {
address public admin;
uint256 public maxNFTs;
uint256 public NFTCount;
uint256 public NFTPrice;
mapping (uint256 => string) internal idToHash;
mapping (uint256 => address) internal idToOwner;
uint256 public blockTime;
string private correct_password;
constructor() {
admin = msg.sender;
maxNFTs = 99;
NFTCount = 0;
NFTPrice = 10000000000000000;
blockTime = block.timestamp;
}
function mint(string memory _hashu) external payable {
require(msg.sender == admin, 'You are not the central admin!');
require(blockTime <= block.timestamp + 5 minutes, 'Chill bro!');
require(NFTCount <= 99, 'You shall not pass! All NFTz are minted!');
require(msg.value >= NFTPrice, 'Where are da fundz?');
blockTime = block.timestamp;
NFTCount = NFTCount + 1;
NFTPrice = NFTPrice * 2;
idToOwner[NFTCount] = msg.sender;
idToHash[NFTCount] = _hashu;
}
function transfer(uint256 _tokenId, address _toAddress) external {
require(msg.sender == idToOwner[_tokenId], 'But it is not yours!');
idToOwner[_tokenId] = _toAddress;
}
function adminWithdraw() external returns (bool) {
require(msg.sender == admin, 'You are not the central admin!');
(bool sent,) = msg.sender.call{value: address(this).balance}("");
return sent;
}
function WhoGotchaThat(uint256 _whichOne) public view returns (address) {
return(idToOwner[_whichOne]);
}
function WhatIsTheHash(uint256 _tokenId) public view returns (string memory){
return(idToHash[_tokenId]);
}
function adminChange(address _newAdmin) external returns (bool) {
require(blockTime <= block.timestamp + 6 minutes, 'Welcome to the game!');
admin = _newAdmin;
return true;
}
function set_password() external {
require(msg.sender == admin, 'You are not the central admin!');
correct_password = correct_password;
}
function su1c1d3(address payable _addr, string memory _password) external {
require(msg.sender == admin, 'You are not the central admin!');
require(keccak256(abi.encodePacked(correct_password)) == keccak256(abi.encodePacked(_password)), 'Very sekur.');
selfdestruct(_addr);
}
fallback() external payable {}
receive() external payable {}