// SPDX-License-Identifier: MIT
// Audit on 5-Jan-2021 by Keno and BoringCrypto
pragma solidity >=0.6.12;

// Source: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol + Claimable.sol
// Edited by BoringCrypto

contract BoringOwnableData {
    address public owner;
    address public pendingOwner;
}

contract BoringOwnable is BoringOwnableData {
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () public {
        owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }

    function transferOwnership(address newOwner, bool direct, bool renounce) public onlyOwner {
        if (direct) {
            require(newOwner != address(0) || renounce, "Ownable: zero address");
            emit OwnershipTransferred(owner, newOwner);
            owner = newOwner;
        } else {
            pendingOwner = newOwner;
        }
    }

    function claimOwnership() public {
        address _pendingOwner = pendingOwner;
        require(msg.sender == _pendingOwner, "Ownable: caller != pending owner");

        emit OwnershipTransferred(owner, _pendingOwner);
        owner = _pendingOwner;
        pendingOwner = address(0);
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "Ownable: caller is not the owner");
        _;
    }
}