How I have Made web3 AIRBNB Dapp Tutorial 2023

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "./PriceConverter.sol";
import "./ERC721.sol";

contract DecentralAirbnb is PriceConverter {
    //--------------------------------------------------------------------
    // VARIABLES

    ERC721 public erc721;

    address public admin;

    uint256 public listingFee;
    uint256 private _rentalIds;

    struct RentalInfo {
        uint256 id;
        address owner;
        string name;
        string city;
        string latitude;
        string longitude;
        string description;
        string imgUrl;
        uint256 maxNumberOfGuests;
        uint256 pricePerDay;
    }

    struct Booking {
        address renter;
        uint256 fromTimestamp;
        uint256 toTimestamp;
    }

    RentalInfo[] public rentals;

    mapping(uint256 => Booking[]) rentalBookings;

    //--------------------------------------------------------------------
    // EVENTS

    event NewRentalCreated(
        uint256 id,
        address owner,
        string name,
        string city,
        string latitude,
        string longitude,
        string description,
        string imgUrl,
        uint256 maxGuests,
        uint256 pricePerDay,
        uint256 timestamp
    );

    event NewBookAdded(
        uint256 rentalId,
        address renter,
        uint256 bookDateStart,
        uint256 bookDateEnd,
        uint256 timestamp
    );

    //--------------------------------------------------------------------
    // ERRORS

    error DecentralAirbnb__OnlyAdmin();
    error DecentralAirbnb__InvalidFee();
    error DecentralAirbnb__InvalidRentalId();
    error DecentralAirbnb__InvalidBookingPeriod();
    error DecentralAirbnb__AlreadyBooked();
    error DecentralAirbnb__InsufficientAmount();
    error DecentralAirbnb__TransferFailed();

    //--------------------------------------------------------------------
    // MODIFIERS

    modifier onlyAdmin() {
        if(msg.sender != admin) revert DecentralAirbnb__OnlyAdmin();
        _;
    }

    modifier isRental(uint _id) {
        if(_id >= _rentalIds) revert DecentralAirbnb__InvalidRentalId();
        _;
    }

    //--------------------------------------------------------------------
    // CONSTRUCTOR

    constructor(uint256 _listingFee, address _priceFeedAddress, address erc721address) {
        admin = msg.sender;
        listingFee = _listingFee;
        priceFeedAddress = _priceFeedAddress;
        erc721 = ERC721(erc721address);
    }

    //--------------------------------------------------------------------
    // FUNCTIONS

    function addRental(
        string memory _name,
        string memory _city,
        string memory _latitude,
        string memory _longitude,
        string memory _description,
        string memory _imgUrl,
        uint256 _maxGuests,
        uint256 _pricePerDay
    ) external payable {
        if(msg.value != listingFee) revert DecentralAirbnb__InvalidFee();
        uint256 _rentalId = _rentalIds;

        RentalInfo memory _rental = RentalInfo(
            _rentalId,
            msg.sender,
            _name,
            _city,
            _latitude,
            _longitude,
            _description,
            _imgUrl,
            _maxGuests,
            _pricePerDay
        );

        rentals.push(_rental);
        _rentalIds++;

        emit NewRentalCreated(
            _rentalId,
            msg.sender,
            _name,
            _city,
            _latitude,
            _longitude,
            _description,
            _imgUrl,
            _maxGuests,
            _pricePerDay,
            block.timestamp
        );
    }

    function bookDates(
        uint256 _id,
        uint256 _fromDateTimestamp,
        uint256 _toDateTimestamp
    ) external payable isRental(_id) {

        RentalInfo memory _rental = rentals[_id];

        uint256 bookingPeriod = (_toDateTimestamp - _fromDateTimestamp) /
            1 days;
        // can't book less than 1 day
        if(bookingPeriod < 1) revert DecentralAirbnb__InvalidBookingPeriod();

        uint256 _amount = convertFromUSD(_rental.pricePerDay) * bookingPeriod;

        if(msg.value != _amount) revert DecentralAirbnb__InsufficientAmount();
        if(checkIfBooked(_id, _fromDateTimestamp, _toDateTimestamp)) revert DecentralAirbnb__AlreadyBooked();

        rentalBookings[_id].push(
            Booking(msg.sender, _fromDateTimestamp, _toDateTimestamp)
        );

        (bool success,) = payable(_rental.owner).call{value: msg.value}("");
        if (!success) revert DecentralAirbnb__TransferFailed();

        erc721.mintUsingSequentialTokenId();

        emit NewBookAdded(
            _id,
            msg.sender,
            _fromDateTimestamp,
            _toDateTimestamp,
            block.timestamp
        );
    }

    function checkIfBooked(
        uint256 _id,
        uint256 _fromDateTimestamp,
        uint256 _toDateTimestamp
    ) internal view returns (bool) {

        Booking[] memory _rentalBookings = rentalBookings[_id];

        // Make sure the rental is available for the booking dates
        for (uint256 i = 0; i < _rentalBookings.length;) {
            if (
                ((_fromDateTimestamp >= _rentalBookings[i].fromTimestamp) &&
                    (_fromDateTimestamp <= _rentalBookings[i].toTimestamp)) ||
                ((_toDateTimestamp >= _rentalBookings[i].fromTimestamp) &&
                    (_toDateTimestamp <= _rentalBookings[i].toTimestamp))
            ) {
                return true;
            }
            unchecked {
                ++i;
            }
        }
        return false;
    }

    function getRentals() external view returns (RentalInfo[] memory) {
        return rentals;
    }

    // Return the list of booking for a given rental
    function getRentalBookings(uint256 _id)
        external
        view
        isRental(_id)
        returns (Booking[] memory)
    {
        return rentalBookings[_id];
    }

    function getRentalInfo(uint256 _id)
        external
        view
        isRental(_id)
        returns (RentalInfo memory)
    {
        return rentals[_id];
    }

    // ADMIN FUNCTIONS

    function changeListingFee(uint256 _newFee) external onlyAdmin {
        listingFee = _newFee;
    }

    function withdrawBalance() external onlyAdmin {
        (bool success,) = payable(admin).call{value: address(this).balance}("");
        if (!success) revert DecentralAirbnb__TransferFailed();
    }
}

function getPrice() public view returns (uint256, uint256) {
    AggregatorV3Interface priceFeed = AggregatorV3Interface(
        priceFeedAddress
    );
    (, int256 price, , , ) = priceFeed.latestRoundData();
    uint256 decimals = priceFeed.decimals();
    return (uint256(price), decimals);
}

function convertFromUSD(uint256 amountInUSD) public view returns (uint256) {
    (uint256 price, uint256 decimals) = getPrice();
    uint256 convertedPrice = (amountInUSD * 10**decimals) / price;
    return convertedPrice;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/utils/introspection/ERC165.sol";





/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    address payable private _contractCreator;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    uint256 private _tokenIdIndex;

    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
    bytes4 private constant _INTERFACE_ID_OFFICIAL_ERC721 = 0x80ac58cd;

    // Mapping from token ID to owner address
    mapping (uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping (address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    event GenerateTokenId(address indexed addr, uint256 indexed id);
    event GenerateCommitment(address indexed addr, uint256 indexed id);
    event Burn(address burner, uint256 tokenId);

    string private constant _baseURL = "https://ipfs.io/ipfs/QmeSjSinHpPnmXmspMjwiXyN6zS4E9zccariGR3jxcaWtq/";

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor () {
        _name = "Door Tokens";
        _symbol = "TKN";
        _contractCreator = payable(msg.sender);
        _tokenIdIndex = 1;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public pure virtual override(ERC165, IERC165) returns (bool) {
        return (interfaceId == _INTERFACE_ID_ERC165 || interfaceId == _INTERFACE_ID_ERC721_METADATA || interfaceId == _INTERFACE_ID_OFFICIAL_ERC721);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        return string(abi.encodePacked(_baseURL, uint2str(tokenId)));
    }

    function uint2str(uint _i) internal pure returns (string memory _uintAsString) {
        if (_i == 0) {
            return "0";
        }
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len;
        while (_i != 0) {
            k = k-1;
            uint8 temp = (48 + uint8(_i - _i / 10 * 10));
            bytes1 b1 = bytes1(temp);
            bstr[k] = b1;
            _i /= 10;
        }
        return string(bstr);
    }

    function mintUsingSequentialTokenId() public returns (uint256 tokenId) {
         tokenId = _tokenIdIndex;
        _mint(_contractCreator, tokenId);
        emit GenerateTokenId(_contractCreator, tokenId);
        _tokenIdIndex++;
    }

    function mintUsingSequentialTokenId(address to) public returns (uint256 tokenId) {
        require(_contractCreator == msg.sender, "Minting not permitted");  //uncomment to restrict minting
        tokenId = _tokenIdIndex;
        _mint(to, tokenId);
        emit GenerateTokenId(to, tokenId);
        _tokenIdIndex++;
    }

    function burn(uint256 tokenId) public {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: Burn caller is not owner nor approved");
        _burn(tokenId);
        emit Burn(msg.sender, tokenId);
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        _mint(to, tokenId);
        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    // solhint-disable-next-line no-inline-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    function endContract() public payable
    {
        if (msg.sender == _contractCreator)
        {
            selfdestruct(_contractCreator);
        }
        else revert();
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}

const hre = require("hardhat");
const fs = require('fs');
const { verify } = require('../utils/verify')

const LOCAL_NETWORKS = ["localhost", "ganache", "mumbai","goerli"]
const fse = require('fs-extra');


async function deployMock() {
  const DECIMALS = "8"
  const INITIAL_PRICE = "200000000000"

  const Mock = await hre.ethers.getContractFactory("MockV3Aggregator")

  console.log("Deploying price feed mock");
  const mockContract = await Mock.deploy(DECIMALS, INITIAL_PRICE)

  await mockContract.deployed();
  console.log("Price feed mock deployed to:", mockContract.address);

  return mockContract.address;
}

 async function deployERC721() {
  const ERC721 = await hre.ethers.getContractFactory("ERC721")
  console.log("Deploying NFT mint contract");
  const erc721Contract = await ERC721.deploy()
  await erc721Contract.deployed();
  console.log("NFT mint contract deployed to:", erc721Contract.address);
  return erc721Contract.address;
 }


async function main() {
  /* these two lines deploy the contract to the network */
  let listingFee = hre.ethers.utils.parseEther("0.001", "ether");
  var priceFeedAddress, erc721Address;
  if (LOCAL_NETWORKS.includes(hre.network.name)) {
    priceFeedAddress = await deployMock()
    erc721Address = await deployERC721()
  }
  // For deploying to polygon mainnet or testnet
  // const priceFeedAddress = ""

  const DecentralAirbnb = await hre.ethers.getContractFactory("DecentralAirbnb")
  const airbnbContract = await DecentralAirbnb.deploy(listingFee, priceFeedAddress , erc721Address )
  await airbnbContract.deployed();
  console.log("Decentral Airbnb deployed to:", airbnbContract.address);
  console.log("Network deployed to :", hre.network.name);

  /* transfer contracts addresses & ABIs to the front-end */
  if (fs.existsSync("../src")) {
    fse.copySync("./artifacts/contracts", "../src/artifacts")
    fs.writeFileSync("../src/utils/contracts-config.js", `
      export const contractAddress = "${airbnbContract.address}"
      export const ownerAddress = "${airbnbContract.signer.address}"
      export const networkDeployedTo = "${hre.network.config.chainId}"
    `)
  }

  if (!LOCAL_NETWORKS.includes(hre.network.name) && hre.config.etherscan.apiKey !== "") {
    await airbnbContract.deployTransaction.wait(6)
    await verify(airbnbContract.address, [listingFee, priceFeedAddress])
  }
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

require("dotenv").config();
require("@nomiclabs/hardhat-etherscan");
require("@nomicfoundation/hardhat-chai-matchers");
require("hardhat-gas-reporter");

// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
  const accounts = await hre.ethers.getSigners();

  for (const account of accounts) {
    console.log(account.address);
  }
});

// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more

/**
 * @type import('hardhat/config').HardhatUserConfig
 */

const POLYGONSCAN_API_KEY = process.env.POLYGONSCAN_API_KEY;
const POLYGON_RPC_URL = process.env.POLYGON_RPC_URL;
const MUMBAI_RPC_URL = process.env.MUMBAI_RPC_URL;
const GOERLI_RPC_URL = process.env.GOERLI_RPC_URL;

module.exports = {
  solidity: {
    compilers: [
      {
        version: "0.8.9",
        settings: {
          optimizer: {
            enabled: true,
            runs: 200,
          },
        },
      },
    ],
  },
  networks: {
    hardhat: {
      chainId: 31337,
    },
    ganache: {
      chainId: 1337,
      url: "http://127.0.0.1:7545",
      accounts: [process.env.PRIVATE_KEY],
      allowUnlimitedContractSize: true,
    },
     mumbai: {
       url: MUMBAI_RPC_URL,
       accounts: [process.env.PRIVATE_KEY],
       chainId: 80001,
     },
     goerli: {
      url: GOERLI_RPC_URL,
      accounts: [process.env.PRIVATE_KEY],
      chainId: 5,
     },
    // polygon: {
    //   url: POLYGON_RPC_URL,
    //   accounts: [process.env.PRIVATE_KEY],
    //   chainId: 137,
    // }
  },
  paths: {
    artifacts: "./artifacts",
  },
  gasReporter: {
    enabled: true,
  },
  etherscan: {
    apiKey: POLYGONSCAN_API_KEY,
  },
};