Created
June 21, 2018 13:51
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pragma solidity ^0.4.21; | |
import "zeppelin-solidity/contracts/token/ERC20/ERC20.sol"; | |
import "zeppelin-solidity/contracts/math/SafeMath.sol"; | |
import "zeppelin-solidity/contracts/ownership/Ownable.sol"; | |
contract Subscription is Ownable { | |
using SafeMath for uint256; | |
/// @dev The token being use | |
ERC20 public token; | |
/// @dev Address where fee are collected | |
address public wallet; | |
/// @dev Cost per day of membership | |
uint256 public subscriptionRate; | |
mapping(uint256 => uint256) subscriptionExpiration; | |
/** | |
* Event for subscription purchase logging | |
* @param purchaser who paid for the subscription | |
* @param userId user id who will benefit from purchase | |
* @param day day of subscription purchased | |
* @param amount amount of subscription purchased in wei | |
* @param expiration expiration of user subscription. | |
*/ | |
event SubscriptionPurchase( | |
address indexed purchaser, | |
uint256 indexed userId, | |
uint256 day, | |
uint256 amount, | |
uint256 expiration | |
); | |
function Subscription( | |
uint256 _rate, | |
address _fundWallet, | |
ERC20 _token) public | |
{ | |
require(_token != address(0)); | |
require(_fundWallet != address(0)); | |
require(_rate > 0); | |
token = _token; | |
wallet = _fundWallet; | |
subscriptionRate = _rate; | |
} | |
function renewSubscription(uint256 _userId, uint _day) external { | |
require(_day > 0); | |
// Calculate amount token amount to purchase by number of day. | |
uint256 amount = subscriptionRate.mul(_day); | |
uint256 currentExpiration = subscriptionExpiration[_userId]; | |
// If their membership already expired... | |
if (currentExpiration < now) { | |
// ...use `now` as the starting point of their new subscription | |
currentExpiration = now; | |
} | |
uint256 newExpiration = currentExpiration.add(_day.mul(1 days)); | |
subscriptionExpiration[_userId] = newExpiration; | |
// Transfer token to our wallet. Always do this last to prevent race conditions. | |
require(token.transferFrom(msg.sender, wallet, amount)); | |
emit SubscriptionPurchase( | |
msg.sender, | |
_userId, | |
_day, | |
amount, | |
newExpiration); | |
} | |
} |
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