be5ed7364b
* Now compiling in a separate directory using truffle 5. * Ported to 0.5.1, now compiling using 0.5.1. * test now also compiles using the truffle 5 hack. * Downgraded to 0.5.0. * Sorted scripts. * Cleaned up the compile script a bit.
83 lines
2.4 KiB
Solidity
83 lines
2.4 KiB
Solidity
pragma solidity ^0.5.0;
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import "../../math/SafeMath.sol";
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import "./FinalizableCrowdsale.sol";
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import "../../payment/escrow/RefundEscrow.sol";
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/**
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* @title RefundableCrowdsale
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* @dev Extension of Crowdsale contract that adds a funding goal, and the possibility of users getting a refund if goal
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* is not met.
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*
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* Deprecated, use RefundablePostDeliveryCrowdsale instead. Note that if you allow tokens to be traded before the goal
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* is met, then an attack is possible in which the attacker purchases tokens from the crowdsale and when they sees that
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* the goal is unlikely to be met, they sell their tokens (possibly at a discount). The attacker will be refunded when
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* the crowdsale is finalized, and the users that purchased from them will be left with worthless tokens.
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*/
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contract RefundableCrowdsale is FinalizableCrowdsale {
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using SafeMath for uint256;
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// minimum amount of funds to be raised in weis
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uint256 private _goal;
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// refund escrow used to hold funds while crowdsale is running
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RefundEscrow private _escrow;
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/**
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* @dev Constructor, creates RefundEscrow.
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* @param goal Funding goal
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*/
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constructor (uint256 goal) public {
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require(goal > 0);
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_escrow = new RefundEscrow(wallet());
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_goal = goal;
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}
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/**
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* @return minimum amount of funds to be raised in wei.
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*/
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function goal() public view returns (uint256) {
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return _goal;
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}
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/**
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* @dev Investors can claim refunds here if crowdsale is unsuccessful
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* @param refundee Whose refund will be claimed.
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*/
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function claimRefund(address payable refundee) public {
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require(finalized());
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require(!goalReached());
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_escrow.withdraw(refundee);
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}
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/**
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* @dev Checks whether funding goal was reached.
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* @return Whether funding goal was reached
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*/
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function goalReached() public view returns (bool) {
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return weiRaised() >= _goal;
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}
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/**
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* @dev escrow finalization task, called when finalize() is called
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*/
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function _finalization() internal {
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if (goalReached()) {
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_escrow.close();
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_escrow.beneficiaryWithdraw();
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} else {
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_escrow.enableRefunds();
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}
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super._finalization();
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}
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/**
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* @dev Overrides Crowdsale fund forwarding, sending funds to escrow.
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*/
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function _forwardFunds() internal {
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_escrow.deposit.value(msg.value)(msg.sender);
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}
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}
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