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pragma solidity ^0.4.11;
import './payment/PullPayment.sol';
import './lifecycle/Destructible.sol';
/**
* @title Bounty
* @dev This bounty will pay out to a researcher if they break invariant logic of the contract.
*/
contract Bounty is PullPayment, Destructible {
bool public claimed;
mapping(address => address) public researchers;
event TargetCreated(address createdAddress);
/**
* @dev Fallback function allowing the contract to receive funds, if they haven't already been claimed.
*/
function() external payable {
if (claimed) {
revert();
}
}
/**
* @dev Create and deploy the target contract (extension of Target contract), and sets the
* msg.sender as a researcher
* @return A target contract
*/
function createTarget() public returns(Target) {
Target target = Target(deployContract());
researchers[address(target)] = msg.sender;
emit TargetCreated(address(target));
return target;
}
/**
* @dev Internal function to deploy the target contract.
* @return A target contract address
*/
function deployContract() internal returns(address);
/**
* @dev Sends the contract funds to the researcher that proved the contract is broken.
* @param target contract
*/
function claim(Target target) public {
address researcher = researchers[address(target)];
if (researcher == address(0)) {
revert();
}
// Check Target contract invariants
if (target.checkInvariant()) {
revert();
}
asyncSend(researcher, address(this).balance);
claimed = true;
}
}
/**
* @title Target
* @dev Your main contract should inherit from this class and implement the checkInvariant method.
*/
contract Target {
/**
* @dev Checks all values a contract assumes to be true all the time. If this function returns
* false, the contract is broken in some way and is in an inconsistent state.
* In order to win the bounty, security researchers will try to cause this broken state.
* @return True if all invariant values are correct, false otherwise.
*/
function checkInvariant() public returns(bool);
}
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