You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.7 KiB
96 lines
2.7 KiB
pragma solidity ^0.5.7;
|
|
|
|
import "../../math/SafeMath.sol";
|
|
import "../Crowdsale.sol";
|
|
|
|
/**
|
|
* @title TimedCrowdsale
|
|
* @dev Crowdsale accepting contributions only within a time frame.
|
|
*/
|
|
contract TimedCrowdsale is Crowdsale {
|
|
using SafeMath for uint256;
|
|
|
|
uint256 private _openingTime;
|
|
uint256 private _closingTime;
|
|
|
|
/**
|
|
* Event for crowdsale extending
|
|
* @param newClosingTime new closing time
|
|
* @param prevClosingTime old closing time
|
|
*/
|
|
event TimedCrowdsaleExtended(uint256 prevClosingTime, uint256 newClosingTime);
|
|
|
|
/**
|
|
* @dev Reverts if not in crowdsale time range.
|
|
*/
|
|
modifier onlyWhileOpen {
|
|
require(isOpen());
|
|
_;
|
|
}
|
|
|
|
/**
|
|
* @dev Constructor, takes crowdsale opening and closing times.
|
|
* @param openingTime Crowdsale opening time
|
|
* @param closingTime Crowdsale closing time
|
|
*/
|
|
constructor (uint256 openingTime, uint256 closingTime) public {
|
|
// solhint-disable-next-line not-rely-on-time
|
|
require(openingTime >= block.timestamp);
|
|
require(closingTime > openingTime);
|
|
|
|
_openingTime = openingTime;
|
|
_closingTime = closingTime;
|
|
}
|
|
|
|
/**
|
|
* @return the crowdsale opening time.
|
|
*/
|
|
function openingTime() public view returns (uint256) {
|
|
return _openingTime;
|
|
}
|
|
|
|
/**
|
|
* @return the crowdsale closing time.
|
|
*/
|
|
function closingTime() public view returns (uint256) {
|
|
return _closingTime;
|
|
}
|
|
|
|
/**
|
|
* @return true if the crowdsale is open, false otherwise.
|
|
*/
|
|
function isOpen() public view returns (bool) {
|
|
// solhint-disable-next-line not-rely-on-time
|
|
return block.timestamp >= _openingTime && block.timestamp <= _closingTime;
|
|
}
|
|
|
|
/**
|
|
* @dev Checks whether the period in which the crowdsale is open has already elapsed.
|
|
* @return Whether crowdsale period has elapsed
|
|
*/
|
|
function hasClosed() public view returns (bool) {
|
|
// solhint-disable-next-line not-rely-on-time
|
|
return block.timestamp > _closingTime;
|
|
}
|
|
|
|
/**
|
|
* @dev Extend parent behavior requiring to be within contributing period.
|
|
* @param beneficiary Token purchaser
|
|
* @param weiAmount Amount of wei contributed
|
|
*/
|
|
function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal onlyWhileOpen view {
|
|
super._preValidatePurchase(beneficiary, weiAmount);
|
|
}
|
|
|
|
/**
|
|
* @dev Extend crowdsale.
|
|
* @param newClosingTime Crowdsale closing time
|
|
*/
|
|
function _extendTime(uint256 newClosingTime) internal {
|
|
require(!hasClosed());
|
|
require(newClosingTime > _closingTime);
|
|
|
|
emit TimedCrowdsaleExtended(_closingTime, newClosingTime);
|
|
_closingTime = newClosingTime;
|
|
}
|
|
}
|
|
|