pragma solidity 0.4.24;
contract SecretClub {
    address owner;
    mapping (address => bool) authorized;
    modifier onlyAuthorized()
    {
        require(authorized[msg.sender]);
        _;
    }
    modifier onlyOwner()
    {
        require(owner == msg.sender);
        _;
    }

    constructor() public {
        owner = msg.sender;
    }

    function authorize(address[] _addressesToAuthorize) public onlyOwner {
        // Add to the list of authorized addresses
        for (uint i=0; i<_addressesToAuthorize.length; i++) {
            authorized[_addressesToAuthorize[i]] = true;
        }
    }

    function deauthorize(address[] _addressesToDeauthorize) public onlyOwner {
        // Remove from the list of authorized addresses
        for (uint i=0; i<_addressesToDeauthorize.length; i++) {
            authorized[_addressesToDeauthorize[i]] = false;
        }
    }

    function doAwesomeThings() public onlyAuthorized
    {
        // Only super awesome authorized people can do this
    }
}