core/contracts/base/LensVersion.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.15;

import {ILensVersion} from 'contracts/interfaces/ILensVersion.sol';
import {Errors} from 'contracts/libraries/constants/Errors.sol';
import {TransparentUpgradeableProxy} from '@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol';

contract LensVersion is ILensVersion {
    string internal constant version = '2.0.0rc1';

    bytes20 internal constant gitCommit = hex'03c5a06d284470dd897bd8e83eb87404224cce03';

    event LensUpgradeVersion(
        address implementation,
        string version,
        bytes20 gitCommit,
        uint256 chainId,
        uint256 blockNumber,
        uint256 timestamp
    );

    /// @inheritdoc ILensVersion
    function getVersion() external pure override returns (string memory) {
        return version;
    }

    /// @inheritdoc ILensVersion
    function getGitCommit() external pure override returns (bytes20) {
        return gitCommit;
    }

    function emitVersion() external {
        (, bytes memory adminData) = address(this).delegatecall(abi.encodeCall(TransparentUpgradeableProxy.admin, ()));
        (, bytes memory implementationData) = address(this).delegatecall(
            abi.encodeCall(TransparentUpgradeableProxy.implementation, ())
        );
        if (msg.sender != abi.decode(adminData, (address))) {
            revert Errors.NotHub();
        }
        emit LensUpgradeVersion(
            abi.decode(implementationData, (address)),
            version,
            gitCommit,
            block.chainid,
            block.number,
            block.timestamp
        );
    }
}