Contract Source Code:

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

/**
 * @title Library for access related errors.
 */
library AccessError {
    /**
     * @dev Thrown when an address tries to perform an unauthorized action.
     * @param addr The address that attempts the action.
     */
    error Unauthorized(address addr);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

/**
 * @title Library for address related errors.
 */
library AddressError {
    /**
     * @dev Thrown when a zero address was passed as a function parameter (0x0000000000000000000000000000000000000000).
     */
    error ZeroAddress();

    /**
     * @dev Thrown when an address representing a contract is expected, but no code is found at the address.
     * @param contr The address that was expected to be a contract.
     */
    error NotAContract(address contr);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

import "../errors/AccessError.sol";

library OwnableStorage {
    bytes32 private constant _SLOT_OWNABLE_STORAGE =
        keccak256(abi.encode("io.synthetix.core-contracts.Ownable"));

    struct Data {
        address owner;
        address nominatedOwner;
    }

    function load() internal pure returns (Data storage store) {
        bytes32 s = _SLOT_OWNABLE_STORAGE;
        assembly {
            store.slot := s
        }
    }

    function onlyOwner() internal view {
        if (msg.sender != getOwner()) {
            revert AccessError.Unauthorized(msg.sender);
        }
    }

    function getOwner() internal view returns (address) {
        return OwnableStorage.load().owner;
    }
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

abstract contract AbstractProxy {
    fallback() external payable {
        _forward();
    }

    receive() external payable {
        _forward();
    }

    function _forward() internal {
        address implementation = _getImplementation();

        // solhint-disable-next-line no-inline-assembly
        assembly {
            calldatacopy(0, 0, calldatasize())

            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            returndatacopy(0, 0, returndatasize())

            switch result
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    function _getImplementation() internal view virtual returns (address);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

contract ProxyStorage {
    bytes32 private constant _SLOT_PROXY_STORAGE =
        keccak256(abi.encode("io.synthetix.core-contracts.Proxy"));

    struct ProxyStore {
        address implementation;
        bool simulatingUpgrade;
    }

    function _proxyStore() internal pure returns (ProxyStore storage store) {
        bytes32 s = _SLOT_PROXY_STORAGE;
        assembly {
            store.slot := s
        }
    }
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

import "./AbstractProxy.sol";
import "./ProxyStorage.sol";
import "../errors/AddressError.sol";
import "../utils/AddressUtil.sol";

contract UUPSProxy is AbstractProxy, ProxyStorage {
    constructor(address firstImplementation) {
        if (firstImplementation == address(0)) {
            revert AddressError.ZeroAddress();
        }

        if (!AddressUtil.isContract(firstImplementation)) {
            revert AddressError.NotAContract(firstImplementation);
        }

        _proxyStore().implementation = firstImplementation;
    }

    function _getImplementation() internal view virtual override returns (address) {
        return _proxyStore().implementation;
    }
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

import {UUPSProxy} from "./UUPSProxy.sol";
import {OwnableStorage} from "../ownership/OwnableStorage.sol";

contract UUPSProxyWithOwner is UUPSProxy {
    // solhint-disable-next-line no-empty-blocks
    constructor(address firstImplementation, address initialOwner) UUPSProxy(firstImplementation) {
        OwnableStorage.load().owner = initialOwner;
    }
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

library AddressUtil {
    function isContract(address account) internal view returns (bool) {
        uint256 size;

        assembly {
            size := extcodesize(account)
        }

        return size > 0;
    }
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.11 <0.9.0;

import {UUPSProxyWithOwner} from "@synthetixio/core-contracts/contracts/proxy/UUPSProxyWithOwner.sol";

contract Proxy is UUPSProxyWithOwner {
    constructor(
        address firstImplementation,
        address initialOwner
    ) UUPSProxyWithOwner(firstImplementation, initialOwner) {} // solhint-disable-line no-empty-blocks
}