medium-auction-contract-withdraw.sol

medium-auction-contract-withdraw.sol

function withdraw()
    onlyEndedOrCanceled
    returns (bool success)
{
    address withdrawalAccount;
    uint withdrawalAmount;

    if (canceled) {
        // if the auction was canceled, everyone should simply be allowed to withdraw their funds
        withdrawalAccount = msg.sender;
        withdrawalAmount = fundsByBidder[withdrawalAccount];

    } else {
        // the auction finished without being canceled

        if (msg.sender == owner) {
            // the auction's owner should be allowed to withdraw the highestBindingBid
            withdrawalAccount = highestBidder;
            withdrawalAmount = highestBindingBid;
            ownerHasWithdrawn = true;

        } else if (msg.sender == highestBidder) {
            // the highest bidder should only be allowed to withdraw the difference between their
            // highest bid and the highestBindingBid
            withdrawalAccount = highestBidder;
            if (ownerHasWithdrawn) {
                withdrawalAmount = fundsByBidder[highestBidder];
            } else {
                withdrawalAmount = fundsByBidder[highestBidder] - highestBindingBid;
            }

        } else {
            // anyone who participated but did not win the auction should be allowed to withdraw
            // the full amount of their funds
            withdrawalAccount = msg.sender;
            withdrawalAmount = fundsByBidder[withdrawalAccount];
        }
    }

    if (withdrawalAmount == 0) throw;

    fundsByBidder[withdrawalAccount] -= withdrawalAmount;

    // send the funds
    if (!msg.sender.send(withdrawalAmount)) throw;

    LogWithdrawal(msg.sender, withdrawalAccount, withdrawalAmount);

    return true;
}