fix(order-signing): fail loudly when appData is a document, not a hash - #969
fix(order-signing): fail loudly when appData is a document, not a hash#969gomesalexandre wants to merge 2 commits into
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Passing a QuoteResponse's appData straight into signOrder currently reaches the EIP-712 encoder and dies with 'invalid hex string (argument="value", ... code=INVALID_ARGUMENT)', which says nothing about what was actually wrong. Validate order.appData is a bytes32 hash up front and throw a CowError that names the problem and points at getAppDataInfo(). Deliberately not hashing the document for the caller: the canonical hash is keccak256 over the deterministically stringified document and it has to match what was registered with the orderbook. Hashing an arbitrary string here would produce a valid-looking hash that resolves to nothing.
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📝 WalkthroughWalkthroughThe order-signing utilities now validate ChangesappData validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The change makes invalid appData fail with a clear error before signing. A small follow-up could assert the specific CowError type in tests, but no actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@packages/order-signing/tests/orderSigningUtils.test.ts`:
- Around line 45-47: Update the invalid appData rejection assertions around
OrderSigningUtils.signOrder to verify the thrown value is a CowError, while
retaining the existing expected-message assertion; apply the same change to the
additional assertion noted in the comment.
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packages/order-signing/src/utils.tspackages/order-signing/tests/orderSigningUtils.test.ts
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Per review - a generic Error with the same text would have passed.
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Closes #192
If you pass a
OrderQuoteResponse'sappDatastraight intoOrderSigningUtils.signOrder(), the document reaches the EIP-712 encoder and you get this:Which tells you nothing about what you did wrong.
appDatain the order struct is abytes32, so it can only hold the hash - but nothing says so until ethers chokes on it deep in the signing path.This validates
order.appDataup front and throws aCowErrorthat actually names the problem and points atgetAppDataInfo().why it doesn't just hash it for you
The issue suggests the SDK should "hash the correct parts" itself. I went the other way on purpose, and I'm happy to be overruled.
The canonical
appDataHexis keccak256 over the deterministically stringified document - that's whatstringifyDeterministicin@cowprotocol/app-dataexists for. Hashing whatever string the caller happened to pass would produce a perfectly valid-looking bytes32 that doesn't match the document registered with the orderbook. You'd sign an order pointing at appData nobody can resolve, and you'd find out much later than you'd like.Failing fast at the call site felt like the safer default for something that ends up in a signature. If you'd rather it auto-hash via
getAppDataInfo()I'll happily switch it, it's a small change - it just meansorder-signingtakes a dependency onapp-data, which it currently doesn't have.receipts
Guard removed, so you get today's behaviour - note it reproduces the exact error from the issue:
With the guard:
Both new tests run across all three adapters (ethers v5, ethers v6, viem) via the existing
createAdapters()setup.risk
Low-ish, but it's a new throw on a public method. Anything that was passing a non-bytes32
appDatawas already failing, just with a worse message - so no working call site changes behaviour. Only thing that'd break is someone relying on the ethers error type/message, which seems unlikely.Summary by CodeRabbit
0x-prefixed bytes32 hash before signing.