fix: reject zero-value bids in bid()#67
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WalkthroughAdded input validation to the Changes
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Actionable comments posted: 1
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Inline comments:
In `@contracts/EnglishAuction.sol`:
- Around line 93-95: Add a unit test that calls the bid(uint256 auctionId,
uint256 bidAmount) function and asserts it reverts with "Bid amount must be
greater than zero" when bidAmount == 0; locate the auction via AuctionData in
auctions[auctionId] and ensure the test covers both a case where the auction's
minimumBid > 0 and a case where minimumBid == 0 so the require in bid(...)
always triggers; use the exists and beforeDeadline preconditions (set up a valid
auctionId and deadline) so the revert is caused by the zero bid check in bid().
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contracts/EnglishAuction.sol
| function bid(uint256 auctionId, uint256 bidAmount) external nonReentrant exists(auctionId) beforeDeadline(auctions[auctionId].deadline) { | ||
| function bid(uint256 auctionId, uint256 bidAmount) external exists(auctionId) beforeDeadline(auctions[auctionId].deadline) { | ||
| AuctionData storage auction = auctions[auctionId]; | ||
| require(bidAmount > 0, "Bid amount must be greater than zero"); |
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On the next line, we are checking if bid amount is greater than min bid amount or not. So if auctioner has made starting bid to be 0, we should allow users to place bid with 0.
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Hey, but a user can keep bidding 0 for free, stay as winner, and keep extending the auction without paying anything. If we truly want to allow zero bids, we can try a different design (e.g., explicit first-bid state), not just removing the zero-bid guard. We can separate “first valid bid” from the bid amount itself, and only let meaningful bids update winner/deadline. Then 0 would be treated as a non-valid bid (no winner update, no deadline extension).
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Addressed Issues:
Fixes #65
contracts/EnglishAuction.solinsidebid(uint256 auctionId, uint256 bidAmount)immediately after:AuctionData storage auction = auctions[auctionId];require(bidAmount > 0, "Bid amount must be greater than zero");Screenshots/Recordings:
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