AugurParasite.sol

contract IMarket {
    function getWinningPayoutNumerator(uint256 _outcome) public view returns (uint256);
}

contract AugurParasite {

    address market;

    address player1;
    address player2;

    uint256 amount1;
    uint256 amount2;

    bool funded1;
    bool funded2;

    constructor(address _player1, address _player2, uint256 _amount1, uint256 _amount2, address _market) public {
        player1 = _player1;
        player2 = _player2;
        amount1 = _amount1;
        amount2 = _amount2;
        market = _market;
    }

    function() external {
        if (msg.sender == player1) {
            require(msg.value == amount1, "Wrong amount sent by player 1");
            funded1 = true;
        } else if (msg.sender == player1) {
            require(msg.value == amount2, "Wrong amount sent by player 2");
            funded2 = true;
        } else {
            revert("Payer was not one of the expected players");
        }
    }

    function settle() external {
        require(funded1 && funded2);
        if (IMarket(market).getWinningPayoutNumerator(0) == 100) {
            player1.transfer(address(this).balance);
        } else {
            player2.transfer(address(this).balance);
        }
    }

    function forfeit() external {
        require(funded1 && funded2);
        if (msg.sender == player1) {
            player1.transfer(address(this).balance/100);
            player2.transfer(address(this).balance);
        } else if (msg.sender == player2) {
            player2.transfer(address(this).balance/100);
            player1.transfer(address(this).balance);
        } else {
            revert();
        }
    }

    function abort() external {
        if (msg.sender == player1) {
            require(funded1);
            require(!funded2);
            funded1 = false;
            player1.transfer(amount1);
        } else if (msg.sender == player2) {
            require(funded2);
            require(!funded1);
            funded2 = false;
            player2.transfer(amount2);
        } else {
            revert("Payer was not one of the expected players");
        }
    }

}