openzeppelin-contracts/contracts/ownership/HasNoEther.sol

pragma solidity ^0.4.8;

import "./Ownable.sol";

/** @title Contracts that should not own Ether
* @author Remco Bloemen <remco@2π.com>

* @dev This tries to block incoming ether to prevent accidental loss of Ether.
Should Ether end up in the contrat, it will allow the owner to reclaim
this ether.
* @notice Ether can still be send to this contract by:
  * calling functions labeled `payable`
  * `selfdestruct(contract_address)`
  * mining directly to the contract address
*/
contract HasNoEther is Ownable {

  /**
  * @dev Constructor that rejects incoming Ether
  * @dev The flag `payable` is added so we can access `msg.value`
  without compiler warning. If we leave out payable, then
  Solidity will allow inheriting contracts to implement a
  payable constructor. By doing it this way we prevent a
  payable constructor from working. Alternatively we could
  use assembly to access msg.value.
  */
  function HasNoEther() payable {
    if(msg.value > 0) {
      throw;
    }
  }

  /**
  * @dev Disallow direct send by settings a default function without `payable`
  */
  function() external {
  }

  /**
  * @dev Transfer all Ether owned by the contract to the owner
  * @dev What if owner is itself a contract marked HasNoEther?
  */
  function reclaimEther() external onlyOwner {
    if(!owner.send(this.balance)) {
      throw;
    }
  }
}