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MeebitsDAO red ticket solidity contract
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.0; | |
| import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; | |
| import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol"; | |
| import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Burnable.sol"; | |
| import "@openzeppelin/contracts/access/AccessControl.sol"; | |
| import "@openzeppelin/contracts/utils/Counters.sol"; | |
| contract MeebitsDAOTickets is | |
| ERC721, | |
| ERC721URIStorage, | |
| ERC721Burnable, | |
| AccessControl | |
| { | |
| using Counters for Counters.Counter; | |
| bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE"); | |
| Counters.Counter private _tokenIdCounter; | |
| constructor() ERC721("MeebitsDAOTickets", "MTIX") { | |
| _setupRole(DEFAULT_ADMIN_ROLE, msg.sender); | |
| _setupRole(MINTER_ROLE, msg.sender); | |
| } | |
| function safeMint( | |
| address to, | |
| uint256 tokenId, | |
| string memory _tokenURI | |
| ) public { | |
| require(hasRole(MINTER_ROLE, msg.sender)); | |
| require( | |
| tokenId <= _tokenIdCounter.current(), | |
| "MeebitsDAOTickets: cannot mint a single token that hasn't been minted already" | |
| ); | |
| _safeMint(to, tokenId); | |
| _setTokenURI(tokenId, _tokenURI); | |
| } | |
| function _burn(uint256 tokenId) | |
| internal | |
| override(ERC721, ERC721URIStorage) | |
| { | |
| super._burn(tokenId); | |
| } | |
| function tokenURI(uint256 tokenId) | |
| public | |
| view | |
| override(ERC721, ERC721URIStorage) | |
| returns (string memory) | |
| { | |
| return super.tokenURI(tokenId); | |
| } | |
| function supportsInterface(bytes4 interfaceId) | |
| public | |
| view | |
| override(ERC721, AccessControl) | |
| returns (bool) | |
| { | |
| return super.supportsInterface(interfaceId); | |
| } | |
| function totalSupply() public view virtual returns (uint256) { | |
| return _tokenIdCounter.current(); | |
| } | |
| } |
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