standard-erc1155.sol

// contracts/GameItems.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155Burnable.sol";
import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155Pausable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControlEnumerable.sol";
import "@openzeppelin/contracts/utils/Context.sol";

/**
 * @dev {ERC1155} token, including:
 *
 *  - ability for holders to burn (destroy) their tokens
 *  - a minter role that allows for token minting (creation)
 *  - a pauser role that allows to stop all token transfers
 *
 * This contract uses {AccessControl} to lock permissioned functions using the
 * different roles - head to its documentation for details.
 *
 * The account that deploys the contract will be granted the minter and pauser
 * roles, as well as the default admin role, which will let it grant both minter
 * and pauser roles to other accounts.
 *
 * _Deprecated in favor of https://wizard.openzeppelin.com/[Contracts Wizard]._
 */
contract GameItems is
  Context,
  AccessControlEnumerable,
  ERC1155Burnable,
  ERC1155Pausable
{
  bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
  bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

  // Token name
  string private _name;

  // Token symbol
  string private _symbol;

  /**
   * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE`, and `PAUSER_ROLE` to the account that
   * deploys the contract.
   */
  constructor(
    string memory uri,
    string memory tokenName,
    string memory tokenSymbol
  ) ERC1155(uri) {
    _name = tokenName;
    _symbol = tokenSymbol;
    _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());

    _setupRole(MINTER_ROLE, _msgSender());
    _setupRole(PAUSER_ROLE, _msgSender());
  }

  /**
   * @dev Returns the token collection name.
   */
  function name() public view virtual returns (string memory) {
    return _name;
  }

  /**
   * @dev Returns the token collection symbol.
   */
  function symbol() public view virtual returns (string memory) {
    return _symbol;
  }

  /**
   * @dev Creates `amount` new tokens for `to`, of token type `id`.
   *
   * See {ERC1155-_mint}.
   *
   * Requirements:
   *
   * - the caller must have the `MINTER_ROLE`.
   */
  function mint(
    address to,
    uint256 id,
    uint256 amount,
    bytes memory data
  ) public payable virtual {
    require(
      hasRole(MINTER_ROLE, _msgSender()),
      "ERC1155PresetMinterPauser: must have minter role to mint"
    );

    _mint(to, id, amount, data);
  }

  /**
   * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] variant of {mint}.
   */
  function mintBatch(
    address to,
    uint256[] memory ids,
    uint256[] memory amounts,
    bytes memory data
  ) public virtual {
    require(
      hasRole(MINTER_ROLE, _msgSender()),
      "ERC1155PresetMinterPauser: must have minter role to mint"
    );

    _mintBatch(to, ids, amounts, data);
  }

  /**
   * @dev Pauses all token transfers.
   *
   * See {ERC1155Pausable} and {Pausable-_pause}.
   *
   * Requirements:
   *
   * - the caller must have the `PAUSER_ROLE`.
   */
  function pause() public virtual {
    require(
      hasRole(PAUSER_ROLE, _msgSender()),
      "ERC1155PresetMinterPauser: must have pauser role to pause"
    );
    _pause();
  }

  /**
   * @dev Unpauses all token transfers.
   *
   * See {ERC1155Pausable} and {Pausable-_unpause}.
   *
   * Requirements:
   *
   * - the caller must have the `PAUSER_ROLE`.
   */
  function unpause() public virtual {
    require(
      hasRole(PAUSER_ROLE, _msgSender()),
      "ERC1155PresetMinterPauser: must have pauser role to unpause"
    );
    _unpause();
  }

  /**
   * @dev See {IERC165-supportsInterface}.
   */
  function supportsInterface(
    bytes4 interfaceId
  )
    public
    view
    virtual
    override(AccessControlEnumerable, ERC1155)
    returns (bool)
  {
    return super.supportsInterface(interfaceId);
  }

  function _beforeTokenTransfer(
    address operator,
    address from,
    address to,
    uint256[] memory ids,
    uint256[] memory amounts,
    bytes memory data
  ) internal virtual override(ERC1155, ERC1155Pausable) {
    super._beforeTokenTransfer(operator, from, to, ids, amounts, data);
  }
}