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contracts...UpgradeableBeacon.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/proxy/beacon/IBeacon.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title UpgradeableBeacon
 * @author Your Name (adapted from OpenZeppelin)
 * @notice A contract that holds the address of an implementation contract, allowing for upgrades.
 */
contract UpgradeableBeacon is IBeacon, Ownable {
    // The address of the master logic (implementation) contract.
    address private _implementation;

    /**
     * @notice Emitted when the implementation address is successfully upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @notice Sets the initial implementation contract address upon deployment.
     * @param implementation_ The address of the `RwaToken` logic contract.
     * @dev Function Owner: The deployer of this beacon contract.
     */
    constructor(address implementation_) Ownable(msg.sender) {
        _setImplementation(implementation_);
    }

    /**
     * @notice Returns the current implementation address.
     * @dev Function Owner: Anyone can call this public view function.
     */
    function implementation() public view virtual override returns (address) {
        return _implementation;
    }

    /**
     * @notice Upgrades the implementation address for all proxies pointing to this beacon.
     * @param newImplementation The address of the new `RwaToken` implementation contract.
     * @dev Function Owner: `onlyOwner` (the deployer of this beacon).
     * @dev Scenario: A bug is found or a new feature is added. The owner deploys the new version and
     * calls this function to upgrade the logic for all existing tokens.
     * @dev Example: `upgradeTo("0xNewRwaTokenV2Address")`.
     */
    function upgradeTo(address newImplementation) public virtual onlyOwner {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Internal function to set the implementation address.
     */
    function _setImplementation(address newImplementation) private {
        require(newImplementation.code.length > 0, "Beacon: implementation is not a contract");
        _implementation = newImplementation;
    }
}