import "@thirdweb-dev/contracts/extension/Permissions.sol";

The Permissions extension provides role-based access control: you can create roles and write custom logic in your smart contract that depends on whether a given wallet holds a given role.

There are two different contracts you can implement to add permissions:

• Permissions: Create roles and restrict access to functions based on those roles.
• PermissionsEnumerable: Permissions plus the capability to view all the addresses holding a specific role (or all roles).

You only need to implement one of the two.

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This is an example smart contract demonstrating how to inherit from this extension and override the functions to add (optional) custom functionality.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@thirdweb-dev/contracts/extension/Permissions.sol";
contract MyContract is Permissions {
    // Any `bytes32` value is a valid role. You can create roles by defining them like this.
    bytes32 public constant NUMBER_ROLE = keccak256("NUMBER_ROLE");
    // See comments for `setNumber`, below.
    uint256 public number;
    /**
     *  The `Permissions` contract makes an already defined role available: the `DEFAULT_ADMIN_ROLE`.
     *
     *  As an EXAMPLE, we grant the deployer of the contract this admin role.
     */
    constructor() {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }
    /**
     *  EXAMPLE: here we have a function that we want to restrict only to holders of `NUMBER_ROLE`.
     *
     *  To accomplish this, we use the `onlyRole` modifier made available by `Permissions`, and
     *  pass it `NUMBER_ROLE` as an argument.
     */
    function setNumber(uint256 _newNumber) public onlyRole(NUMBER_ROLE) {
        number = _newNumber;
    }
}

None of the base contracts implement this extension.