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64 lines
1.6 KiB
64 lines
1.6 KiB
pragma solidity ^0.4.23;
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import "../../math/SafeMath.sol";
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import "../Crowdsale.sol";
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/**
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* @title TimedCrowdsale
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* @dev Crowdsale accepting contributions only within a time frame.
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*/
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contract TimedCrowdsale is Crowdsale {
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using SafeMath for uint256;
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uint256 public openingTime;
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uint256 public closingTime;
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/**
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* @dev Reverts if not in crowdsale time range.
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*/
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modifier onlyWhileOpen {
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// solium-disable-next-line security/no-block-members
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require(block.timestamp >= openingTime && block.timestamp <= closingTime);
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_;
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}
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/**
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* @dev Constructor, takes crowdsale opening and closing times.
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* @param _openingTime Crowdsale opening time
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* @param _closingTime Crowdsale closing time
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*/
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constructor(uint256 _openingTime, uint256 _closingTime) public {
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// solium-disable-next-line security/no-block-members
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require(_openingTime >= block.timestamp);
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require(_closingTime >= _openingTime);
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openingTime = _openingTime;
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closingTime = _closingTime;
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}
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/**
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* @dev Checks whether the period in which the crowdsale is open has already elapsed.
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* @return Whether crowdsale period has elapsed
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*/
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function hasClosed() public view returns (bool) {
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// solium-disable-next-line security/no-block-members
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return block.timestamp > closingTime;
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}
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/**
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* @dev Extend parent behavior requiring to be within contributing period
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* @param _beneficiary Token purchaser
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* @param _weiAmount Amount of wei contributed
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*/
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function _preValidatePurchase(
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address _beneficiary,
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uint256 _weiAmount
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)
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internal
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onlyWhileOpen
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{
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super._preValidatePurchase(_beneficiary, _weiAmount);
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}
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}
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