pragma solidity ^0.4.24;

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

// File: contracts/Affiliate.sol

// solhint-disable-next-line
pragma solidity ^0.4.25;



/** @title Affiliate */
contract Affiliate is Ownable {
    mapping(address => bool) public canSetAffiliate;
    mapping(address => address) public userToAffiliate;

    /** @dev Allows an address to set the affiliate address for a user
      * @param _setter The address that should be allowed
      */
    function setAffiliateSetter(address _setter) public onlyOwner {
        canSetAffiliate[_setter] = true;
    }

    /**
     * @dev Set the affiliate of a user
     * @param _user user to set affiliate for
     * @param _affiliate address to set
     */
    function setAffiliate(address _user, address _affiliate) public {
        require(canSetAffiliate[msg.sender]);
        if (userToAffiliate[_user] == address(0)) {
            userToAffiliate[_user] = _affiliate;
        }
    }

}