OrphanToken.sol

pragma solidity ^0.4.8;

// ----------------------------------------------------------------------------------------------
// Sample fixed supply token contract
// Enjoy. (c) BokkyPooBah 2017. The MIT Licence.
// ----------------------------------------------------------------------------------------------

// ERC Token Standard #20 Interface
// https://github.com/ethereum/EIPs/issues/20
contract ERC20Interface {
// Get the total token supply
function totalSupply() constant returns (uint256 totalSupply);
  
     // Get the account balance of another account with address _owner
     function balanceOf(address _owner) constant returns (uint256 balance);
  
     // Send _value amount of tokens to address _to
     function transfer(address _to, uint256 _value) returns (bool success);
  
     // Send _value amount of tokens from address _from to address _to
     function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
  
     // Allow _spender to withdraw from your account, multiple times, up to the _value amount.
     // If this function is called again it overwrites the current allowance with _value.
     // this function is required for some DEX functionality
     function approve(address _spender, uint256 _value) returns (bool success);
  
     // Returns the amount which _spender is still allowed to withdraw from _owner
     function allowance(address _owner, address _spender) constant returns (uint256 remaining);
  
     // Triggered when tokens are transferred.
     event Transfer(address indexed _from, address indexed _to, uint256 _value);
  
     // Triggered whenever approve(address _spender, uint256 _value) is called.
     event Approval(address indexed _owner, address indexed _spender, uint256 _value);
 }
  
 contract OrphanToken is ERC20Interface {
     string public constant symbol = "OCT";
     string public constant name = "Orphan Token";
     uint8 public constant decimals = 18;
     uint256 _totalSupply = 1000000 * 18e10;
     
     // Owner of this contract
     address public owner;
  
     // Balances for each account
     mapping(address => uint256) balances;
  
     // Owner of account approves the transfer of an amount to another account
     mapping(address => mapping (address => uint256)) allowed;
  
     // Functions with this modifier can only be executed by the owner
     modifier onlyOwner() {
         require (msg.sender == owner);
         _;
     }
  
     // Constructor
     function FixedSupplyToken() {
         owner = msg.sender;
         balances[owner] = _totalSupply;
     }
  
     function totalSupply() constant returns (uint256 totalSupply) {
         totalSupply = _totalSupply;
     }
  
     // What is the balance of a particular account?
     function balanceOf(address _owner) constant returns (uint256 balance) {
         return balances[_owner];
     }
  
     // Transfer the balance from owner's account to another account
     function transfer(address _to, uint256 _amount) returns (bool success) {
         if (balances[msg.sender] >= _amount 
             && _amount > 0
             && balances[_to] + _amount > balances[_to]) {
             balances[msg.sender] -= _amount;
             balances[_to] += _amount;
             Transfer(msg.sender, _to, _amount);
             return true;
         } else {
             return false;
         }
     }
  
     // Send _value amount of tokens from address _from to address _to
     // The transferFrom method is used for a withdraw workflow, allowing contracts to send
     // tokens on your behalf, for example to "deposit" to a contract address and/or to charge
     // fees in sub-currencies; the command should fail unless the _from account has
     // deliberately authorized the sender of the message via some mechanism; we propose
     // these standardized APIs for approval:
     function transferFrom(
         address _from,
         address _to,
         uint256 _amount
     ) returns (bool success) {
         if (balances[_from] >= _amount
             && allowed[_from][msg.sender] >= _amount
             && _amount > 0
             && balances[_to] + _amount > balances[_to]) {
             balances[_from] -= _amount;
             allowed[_from][msg.sender] -= _amount;
             balances[_to] += _amount;
             Transfer(_from, _to, _amount);
             return true;
         } else {
             return false;
         }
     }
  
     // Allow _spender to withdraw from your account, multiple times, up to the _value amount.
     // If this function is called again it overwrites the current allowance with _value.
     function approve(address _spender, uint256 _amount) returns (bool success) {
         allowed[msg.sender][_spender] = _amount;
         Approval(msg.sender, _spender, _amount);
         return true;
     }
  
     function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
         return allowed[_owner][_spender];
     }
 }

contract Crowdsale {

    address public beneficiary;

    	uint public fundingGoal; 
	uint public amountRaised; 
	uint public deadline; 
	uint public price;

    FixedSupplyToken public tokenReward;

    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;

    /* data structure to hold information about campaign contributors */

    /*  at initialization, setup the owner */
    function Crowdsale(
        address ifSuccessfulSendTo,
        uint fundingGoalInEthers,
        uint durationInMinutes,
        uint etherCostOfEachToken,
        FixedSupplyToken addressOfTokenUsedAsReward
    ) {
        beneficiary = ifSuccessfulSendTo;
        fundingGoal = fundingGoalInEthers * 1 ether;
        deadline = now + durationInMinutes * 1 minutes;
        price = etherCostOfEachToken * 1 ether;
        tokenReward = FixedSupplyToken(addressOfTokenUsedAsReward);
    }

    /* The function without name is the default function that is called whenever anyone sends funds to a contract */
    function () payable {
        require (!crowdsaleClosed);
        uint amount = amount + msg.value;
        balanceOf[msg.sender] += 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){
            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;
            }
        }
    }
}