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contracts/access/AccessControlUpgradeable.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.5.0-rc.0) (access/AccessControl.sol)
+
+pragma solidity ^0.8.0;
+
+import "./IAccessControlUpgradeable.sol";
+import "../utils/ContextUpgradeable.sol";
+import "../utils/StringsUpgradeable.sol";
+import "../utils/introspection/ERC165Upgradeable.sol";
+import "../proxy/utils/Initializable.sol";
+
+/**
+ * @dev Contract module that allows children to implement role-based access
+ * control mechanisms. This is a lightweight version that doesn't allow enumerating role
+ * members except through off-chain means by accessing the contract event logs. Some
+ * applications may benefit from on-chain enumerability, for those cases see
+ * {AccessControlEnumerable}.
+ *
+ * Roles are referred to by their `bytes32` identifier. These should be exposed
+ * in the external API and be unique. The best way to achieve this is by
+ * using `public constant` hash digests:
+ *
+ * ```
+ * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
+ * ```
+ *
+ * Roles can be used to represent a set of permissions. To restrict access to a
+ * function call, use {hasRole}:
+ *
+ * ```
+ * function foo() public {
+ *     require(hasRole(MY_ROLE, msg.sender));
+ *     ...
+ * }
+ * ```
+ *
+ * Roles can be granted and revoked dynamically via the {grantRole} and
+ * {revokeRole} functions. Each role has an associated admin role, and only
+ * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
+ *
+ * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
+ * that only accounts with this role will be able to grant or revoke other
+ * roles. More complex role relationships can be created by using
+ * {_setRoleAdmin}.
+ *
+ * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
+ * grant and revoke this role. Extra precautions should be taken to secure
+ * accounts that have been granted it.
+ */
+abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControlUpgradeable, ERC165Upgradeable {
+    function __AccessControl_init() internal onlyInitializing {
+        __Context_init_unchained();
+        __ERC165_init_unchained();
+        __AccessControl_init_unchained();
+    }
+
+    function __AccessControl_init_unchained() internal onlyInitializing {
+    }
+    struct RoleData {
+        mapping(address => bool) members;
+        bytes32 adminRole;
+    }
+
+    mapping(bytes32 => RoleData) private _roles;
+
+    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
+
+    /**
+     * @dev Modifier that checks that an account has a specific role. Reverts
+     * with a standardized message including the required role.
+     *
+     * The format of the revert reason is given by the following regular expression:
+     *
+     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
+     *
+     * _Available since v4.1._
+     */
+    modifier onlyRole(bytes32 role) {
+        _checkRole(role, _msgSender());
+        _;
+    }
+
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
+        return interfaceId == type(IAccessControlUpgradeable).interfaceId || super.supportsInterface(interfaceId);
+    }
+
+    /**
+     * @dev Returns `true` if `account` has been granted `role`.
+     */
+    function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
+        return _roles[role].members[account];
+    }
+
+    /**
+     * @dev Revert with a standard message if `account` is missing `role`.
+     *
+     * The format of the revert reason is given by the following regular expression:
+     *
+     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
+     */
+    function _checkRole(bytes32 role, address account) internal view virtual {
+        if (!hasRole(role, account)) {
+            revert(
+                string(
+                    abi.encodePacked(
+                        "AccessControl: account ",
+                        StringsUpgradeable.toHexString(uint160(account), 20),
+                        " is missing role ",
+                        StringsUpgradeable.toHexString(uint256(role), 32)
+                    )
+                )
+            );
+        }
+    }
+
+    /**
+     * @dev Returns the admin role that controls `role`. See {grantRole} and
+     * {revokeRole}.
+     *
+     * To change a role's admin, use {_setRoleAdmin}.
+     */
+    function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
+        return _roles[role].adminRole;
+    }
+
+    /**
+     * @dev Grants `role` to `account`.
+     *
+     * If `account` had not been already granted `role`, emits a {RoleGranted}
+     * event.
+     *
+     * Requirements:
+     *
+     * - the caller must have ``role``'s admin role.
+     */
+    function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
+        _grantRole(role, account);
+    }
+
+    /**
+     * @dev Revokes `role` from `account`.
+     *
+     * If `account` had been granted `role`, emits a {RoleRevoked} event.
+     *
+     * Requirements:
+     *
+     * - the caller must have ``role``'s admin role.
+     */
+    function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
+        _revokeRole(role, account);
+    }
+
+    /**
+     * @dev Revokes `role` from the calling account.
+     *
+     * Roles are often managed via {grantRole} and {revokeRole}: this function's
+     * purpose is to provide a mechanism for accounts to lose their privileges
+     * if they are compromised (such as when a trusted device is misplaced).
+     *
+     * If the calling account had been revoked `role`, emits a {RoleRevoked}
+     * event.
+     *
+     * Requirements:
+     *
+     * - the caller must be `account`.
+     */
+    function renounceRole(bytes32 role, address account) public virtual override {
+        require(account == _msgSender(), "AccessControl: can only renounce roles for self");
+
+        _revokeRole(role, account);
+    }
+
+    /**
+     * @dev Grants `role` to `account`.
+     *
+     * If `account` had not been already granted `role`, emits a {RoleGranted}
+     * event. Note that unlike {grantRole}, this function doesn't perform any
+     * checks on the calling account.
+     *
+     * [WARNING]
+     * ====
+     * This function should only be called from the constructor when setting
+     * up the initial roles for the system.
+     *
+     * Using this function in any other way is effectively circumventing the admin
+     * system imposed by {AccessControl}.
+     * ====
+     *
+     * NOTE: This function is deprecated in favor of {_grantRole}.
+     */
+    function _setupRole(bytes32 role, address account) internal virtual {
+        _grantRole(role, account);
+    }
+
+    /**
+     * @dev Sets `adminRole` as ``role``'s admin role.
+     *
+     * Emits a {RoleAdminChanged} event.
+     */
+    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
+        bytes32 previousAdminRole = getRoleAdmin(role);
+        _roles[role].adminRole = adminRole;
+        emit RoleAdminChanged(role, previousAdminRole, adminRole);
+    }
+
+    /**
+     * @dev Grants `role` to `account`.
+     *
+     * Internal function without access restriction.
+     */
+    function _grantRole(bytes32 role, address account) internal virtual {
+        if (!hasRole(role, account)) {
+            _roles[role].members[account] = true;
+            emit RoleGranted(role, account, _msgSender());
+        }
+    }
+
+    /**
+     * @dev Revokes `role` from `account`.
+     *
+     * Internal function without access restriction.
+     */
+    function _revokeRole(bytes32 role, address account) internal virtual {
+        if (hasRole(role, account)) {
+            _roles[role].members[account] = false;
+            emit RoleRevoked(role, account, _msgSender());
+        }
+    }
+    uint256[49] private __gap;
+}