onedollar crowdsale

onedollar-crowdsale.sol

pragma solidity ^0.4.16;
import "github.com/oraclize/ethereum-api/oraclizeAPI.sol";

interface token {
    function transfer(address receiver, uint amount);
}

contract Crowdsale is usingOraclize{
    address public beneficiary;
    uint public fundingGoal;
    uint public amountRaised;
    uint public deadline;
    uint public price;
    token public tokenReward;
    mapping(address => uint256) public balanceOf;
    bool fundingGoalReached = false;
    bool crowdsaleClosed = false;

    uint public ETHUSD;

    event newOraclizeQuery(string description);
    event newKrakenPriceTicker(string price);

    function KrakenPriceTicker() {
        // FIXME: enable oraclize_setProof is production
        // oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS);
        update(0);
    }

    function __callback(bytes32 myid, string result, bytes proof) {
        if (msg.sender != oraclize_cbAddress()) throw;
        newKrakenPriceTicker(result);
        ETHUSD = parseInt(result, 2); // save it in storage as $ cents
        // do something with ETHUSD
        // update(60); // FIXME: comment this out to enable recursive price updates
    }


    event GoalReached(address beneficiary, uint amountRaised);
    event FundTransfer(address backer, uint amount, bool isContribution);

    /**
     * Constrctor function
     *
     * Setup the owner
     */
    function Crowdsale(
        address ifSuccessfulSendTo,
        uint fundingGoalInEthers,
        uint durationInMinutes,
        uint etherCostOfEachToken,
        address addressOfTokenUsedAsReward
    ) {
        beneficiary = ifSuccessfulSendTo;
        fundingGoal = fundingGoalInEthers * 1 ether;
        deadline = now + durationInMinutes * 1 minutes;
        tokenReward = token(addressOfTokenUsedAsReward);
    } 

    /**
     * Fallback function
     *
     * The function without name is the default function that is called whenever anyone sends funds to a contract
     */
    function () payable {
        update(0);
        require(!crowdsaleClosed);
        uint amount = msg.value;
        balanceOf[msg.sender] += amount;
        amountRaised += amount;
        uint price = ETHUSD;
        tokenReward.transfer(msg.sender, amount / ( 1 / price));
        FundTransfer(msg.sender, amount, true);
    }

    modifier afterDeadline() { if (now >= deadline) _; }

    /**
     * Check if goal was reached
     *
     * 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;
    }


    /**
     * Withdraw the funds
     *
     * Checks to see if goal or time limit has been reached, and if so, and the funding goal was reached,
     * sends the entire amount to the beneficiary. If goal was not reached, each contributor can withdraw
     * the amount they contributed.
     */
    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;
            }
        }
    }
    
    function update(uint delay) payable {
        if (oraclize_getPrice("URL") > this.balance) {
            newOraclizeQuery("Oraclize query was NOT sent, please add some ETH to cover for the query fee");
        } else {
            newOraclizeQuery("Oraclize query was sent, standing by for the answer..");
            oraclize_query(delay, "URL", "json(https://api.kraken.com/0/public/Ticker?pair=ETHUSD).result.XETHZUSD.c.0");
        }
    }
}

contract KrakenPriceTicker is usingOraclize {

    uint public ETHUSD;

    event newOraclizeQuery(string description);
    event newKrakenPriceTicker(string price);

    function KrakenPriceTicker() {
        // FIXME: enable oraclize_setProof is production
        // oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS);
        update(0);
    }

    function __callback(bytes32 myid, string result, bytes proof) {
        if (msg.sender != oraclize_cbAddress()) throw;
        newKrakenPriceTicker(result);
        ETHUSD = parseInt(result, 2); // save it in storage as $ cents
        // do something with ETHUSD
        // update(60); // FIXME: comment this out to enable recursive price updates
    }

    function update(uint delay) payable {
        if (oraclize_getPrice("URL") > this.balance) {
            newOraclizeQuery("Oraclize query was NOT sent, please add some ETH to cover for the query fee");
        } else {
            newOraclizeQuery("Oraclize query was sent, standing by for the answer..");
            oraclize_query(delay, "URL", "json(https://api.kraken.com/0/public/Ticker?pair=ETHUSD).result.XETHZUSD.c.0");
        }
    }

}