pragma solidity ^0.5.0;

import "@openzeppelin/contracts-ethereum-package/contracts/GSN/GSNRecipient.sol";
import "@openzeppelin/upgrades/contracts/Initializable.sol";

contract GSN is Initializable, GSNRecipient {
    function initialize(address relayHub) public initializer {
        GSNRecipient.initialize();
        _upgradeRelayHub(relayHub);
    }

    function acceptRelayedCall(
        address,
        address,
        bytes calldata,
        uint256,
        uint256,
        uint256,
        uint256,
        bytes calldata,
        uint256
    ) external view returns (uint256, bytes memory) {
        return _approveRelayedCall();
    }

    function getRecipientBalance() public view returns (uint) {
        return IRelayHub(getHubAddr()).balanceOf(address(this));
    }

    function version() public pure returns (uint256) {
        return 1;
    }
}