Crowdsale

// Submitted by EthereumHistory (ethereumhistory.com)
 
contract token { function transfer(address receiver, uint amount){  } }

contract Crowdsale {
    
    address public beneficiary;
    uint public fundingGoal; uint public amountRaised; uint public deadline; uint public price;
    token public tokenReward;   
    Funder[] public funders;
    event FundTransfer(address backer, uint amount, bool isContribution);
    bool crowdsaleClosed = false;
    
    
    /* data structure to hold information about campaign contributors */
    struct Funder {
        address addr;
        uint amount;
    }
    
    /*  at initialization, setup the owner */
    function Crowdsale(address ifSucessfulSendTo, uint fundingGoalInEthers, uint durationInMinutes, uint etherCostOfEachToken, token addressOfTokenUsedAsReward) {
        beneficiary = ifSucessfulSendTo;
        fundingGoal = fundingGoalInEthers * 1 ether;
        deadline = now + durationInMinutes * 1 minutes;
        price = etherCostOfEachToken * 1 ether;
        tokenReward = token(addressOfTokenUsedAsReward);
    }   
    
    /* The function without name is the default function that is called whenever anyone sends funds to a contract */
    function () {
        if (crowdsaleClosed) throw;
        uint amount = msg.value;
        funders[funders.length++] = Funder({addr: msg.sender, amount: amount});
        amountRaised += amount;
        tokenReward.transfer(msg.sender, amount / price);
        FundTransfer(msg.sender, amount, true);
    }
        
    modifier afterDeadline() { if (now >= deadline) _ }

    /* checks if the goal or time limit has been reached and ends the campaign */
    function checkGoalReached() afterDeadline {
        if (amountRaised >= fundingGoal){
            beneficiary.send(amountRaised);
            FundTransfer(beneficiary, amountRaised, false);
        } else {
            for (uint i = 0; i < funders.length; ++i) {
              funders[i].addr.send(funders[i].amount);  
              FundTransfer(funders[i].addr, funders[i].amount, false);
            }               
        }
        
        beneficiary.send(this.balance); // send any remaining balance to beneficiary anyway
        crowdsaleClosed = true;
    }
}