DryRunCrowdsale.sol

pragma solidity ^0.4.18;

// File: node_modules/zeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() public {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: node_modules/zeppelin-solidity/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

// File: node_modules/zeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

// File: contracts/DryRunCrowdsale.sol

contract FxRates {
    function getEurRate() public view returns(bytes32);
}


/**
 * @title DryRunCrowdsale
 * @dev This crowdsale contract filters investments made according to:
 *      - time
 *      - amount invested (in Wei)
 *      - eventually a whitelist of addresses?
 */
contract DryRunCrowdsale is Pausable {
  using SafeMath for uint256;

  /*// The token being sold
  ComplexToken public token;*/

  // start and end timestamps where investments are allowed (both inclusive)
  uint256 public startTime; // Donnerstag morgen
  uint256 public endTime;   // Freitag abend

  // address where funds are collected
  address public wallet; // TODO wallet

  // track which users made which investment
  mapping(address => uint256) public investments;

  // how many token units a buyer gets per wei
  /* uint256 public rate; */

  // amount of raised money in wei
  uint256 public weiRaised;

  uint256 public minWeiInvestment;
  uint256 public maxWeiInvestment;

  FxRates public fxRates;

  /**
   * event for token purchase logging
   * @param purchaser who paid for the tokens
   * @param beneficiary who got the tokens
   * @param value weis paid for purchase
   */
  event Investment(address indexed purchaser,
                   address indexed beneficiary,
                   uint256 value,
                   bytes32 fxRate);


  function DryRunCrowdsale(uint256 _startTime, uint256 _endTime,
                           uint256 _minWeiInvestment, uint256 _maxWeiInvestment,
                           address _fxRates,
                           address _wallet) public {
    require(_startTime >= now);
    require(_endTime >= _startTime);
    require(_minWeiInvestment > 0);
    require(_maxWeiInvestment > _minWeiInvestment);
    require(_fxRates != address(0));
    require(_wallet != address(0));

    startTime = _startTime;
    endTime = _endTime;

    minWeiInvestment = _minWeiInvestment;
    maxWeiInvestment = _maxWeiInvestment;

    fxRates = FxRates(_fxRates);

    wallet = _wallet;
  }


  // fallback function can be used to buy tokens
  function () external payable {
    buyTokens(msg.sender);
  }

  // low level token purchase function
  function buyTokens(address beneficiary) whenNotPaused public payable {
    require(beneficiary != address(0));
    require(validPurchase());

    uint256 weiAmount = msg.value;

    // update state
    weiRaised = weiRaised.add(weiAmount);

    bytes32 euroRate = fxRates.getEurRate();
    Investment(msg.sender, beneficiary, weiAmount, euroRate);

    forwardFunds();

    // track how much was transfered
    investments[beneficiary] = investments[beneficiary].add(weiAmount);
  }

  // send ether to the fund collection wallet
  // override to create custom fund forwarding mechanisms
  function forwardFunds() internal {
    // TODO eventually here a refundable wallet
    wallet.transfer(msg.value);
  }

  // overriding Crowdsale#validPurchase to add extra cap logic
  // @return true if investors can buy at the moment
  function validPurchase() internal view returns (bool) {
    if (msg.value < minWeiInvestment || msg.value > maxWeiInvestment) {
      return false;
    }
    bool withinPeriod = now >= startTime && now <= endTime;
    bool nonZeroPurchase = msg.value != 0;
    return withinPeriod && nonZeroPurchase;
  }


  // overriding Crowdsale#hasEnded to add cap logic
  // @return true if crowdsale event has ended
  function hasStarted() public view returns (bool) {
    return now > startTime;
  }


  // overriding Crowdsale#hasEnded to add cap logic
  // @return true if crowdsale event has ended
  function hasEnded() public view returns (bool) {
    return now > endTime;
  }

}