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.
92 lines
2.7 KiB
92 lines
2.7 KiB
pragma solidity ^0.5.0;
|
|
|
|
import "./ConditionalEscrow.sol";
|
|
|
|
/**
|
|
* @title RefundEscrow
|
|
* @dev Escrow that holds funds for a beneficiary, deposited from multiple
|
|
* parties.
|
|
* @dev Intended usage: See Escrow.sol. Same usage guidelines apply here.
|
|
* @dev The primary account (that is, the contract that instantiates this
|
|
* contract) may deposit, close the deposit period, and allow for either
|
|
* withdrawal by the beneficiary, or refunds to the depositors. All interactions
|
|
* with RefundEscrow will be made through the primary contract. See the
|
|
* RefundableCrowdsale contract for an example of RefundEscrow’s use.
|
|
*/
|
|
contract RefundEscrow is ConditionalEscrow {
|
|
enum State { Active, Refunding, Closed }
|
|
|
|
event RefundsClosed();
|
|
event RefundsEnabled();
|
|
|
|
State private _state;
|
|
address payable private _beneficiary;
|
|
|
|
/**
|
|
* @dev Constructor.
|
|
* @param beneficiary The beneficiary of the deposits.
|
|
*/
|
|
constructor (address payable beneficiary) public {
|
|
require(beneficiary != address(0));
|
|
_beneficiary = beneficiary;
|
|
_state = State.Active;
|
|
}
|
|
|
|
/**
|
|
* @return the current state of the escrow.
|
|
*/
|
|
function state() public view returns (State) {
|
|
return _state;
|
|
}
|
|
|
|
/**
|
|
* @return the beneficiary of the escrow.
|
|
*/
|
|
function beneficiary() public view returns (address) {
|
|
return _beneficiary;
|
|
}
|
|
|
|
/**
|
|
* @dev Stores funds that may later be refunded.
|
|
* @param refundee The address funds will be sent to if a refund occurs.
|
|
*/
|
|
function deposit(address refundee) public payable {
|
|
require(_state == State.Active);
|
|
super.deposit(refundee);
|
|
}
|
|
|
|
/**
|
|
* @dev Allows for the beneficiary to withdraw their funds, rejecting
|
|
* further deposits.
|
|
*/
|
|
function close() public onlyPrimary {
|
|
require(_state == State.Active);
|
|
_state = State.Closed;
|
|
emit RefundsClosed();
|
|
}
|
|
|
|
/**
|
|
* @dev Allows for refunds to take place, rejecting further deposits.
|
|
*/
|
|
function enableRefunds() public onlyPrimary {
|
|
require(_state == State.Active);
|
|
_state = State.Refunding;
|
|
emit RefundsEnabled();
|
|
}
|
|
|
|
/**
|
|
* @dev Withdraws the beneficiary's funds.
|
|
*/
|
|
function beneficiaryWithdraw() public {
|
|
require(_state == State.Closed);
|
|
_beneficiary.transfer(address(this).balance);
|
|
}
|
|
|
|
/**
|
|
* @dev Returns whether refundees can withdraw their deposits (be refunded). The overriden function receives a
|
|
* 'payee' argument, but we ignore it here since the condition is global, not per-payee.
|
|
*/
|
|
function withdrawalAllowed(address) public view returns (bool) {
|
|
return _state == State.Refunding;
|
|
}
|
|
}
|
|
|