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| contract Crowdsale { | |
| address public beneficiary; | |
| uint public fundingGoal; uint public amountRaised; uint public deadline; | |
| mapping(address => uint256) public balanceOf; | |
| bool fundingGoalReached = false; | |
| event GoalReached(address beneficiary, uint amountRaised); | |
| event FundTransfer(address backer, uint amount, bool isContribution); | |
| bool crowdsaleClosed = false; | |
| /* at initialization, setup the owner */ | |
| function Crowdsale( | |
| address ifSuccessfulSendTo, | |
| uint fundingGoalInEthers, | |
| uint durationInMinutes | |
| ) { | |
| beneficiary = ifSuccessfulSendTo; | |
| fundingGoal = fundingGoalInEthers * 1 ether; | |
| deadline = now + durationInMinutes * 1 minutes; | |
| } | |
| /* 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; | |
| balanceOf[msg.sender] += amount; | |
| amountRaised += amount; | |
| 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){ | |
| fundingGoalReached = true; | |
| GoalReached(beneficiary, amountRaised); | |
| } | |
| crowdsaleClosed = true; | |
| } | |
| function safeWithdrawal() afterDeadline { | |
| if (!fundingGoalReached) { | |
| uint amount = balanceOf[msg.sender]; | |
| balanceOf[msg.sender] = 0; | |
| if (amount > 0) { | |
| if (msg.sender.send(amount)) { | |
| FundTransfer(msg.sender, amount, false); | |
| } else { | |
| balanceOf[msg.sender] = amount; | |
| } | |
| } | |
| } | |
| if (fundingGoalReached && beneficiary == msg.sender) { | |
| if (beneficiary.send(amountRaised)) { | |
| FundTransfer(beneficiary, amountRaised, false); | |
| } else { | |
| //If we fail to send the funds to beneficiary, unlock funders balance | |
| fundingGoalReached = false; | |
| } | |
| } | |
| } | |
| } |
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