Document ERC7786OpenBridge trust boundaries and delivery semantics - #279
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Consolidates NatSpec follow-ups from a series of external reports on `ERC7786OpenBridge` whose disposition depended on already-in-code but undocumented design intent: - `sendMessage`: aligns with `AxelarGatewayAdapter.sendMessage` on the source-side non-validation of the recipient's address component, and states explicitly that the per-gateway `try`/`catch` isolates gateway reverts (not interface non-compliance from gateways returning EVM-successful but malformed data). - `receiveMessage`: documents that the public retry path only performs work once the threshold has been reached from gateway deliveries, and frames the wrong-return-value revert as a deliberate signal treating the recipient as the interface-violating party rather than the bridge. - `_addGateway`: states that registering a gateway trusts it to implement the ERC-7786 interface, and that the `code.length > 0` check is a fat-finger guard against plain EOAs (not an interface attestation, and in particular passing for EIP-7702 delegated EOAs). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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WalkthroughThe pull request expands ERC7786 bridge documentation for message validation, gateway failures, retry execution, recipient return values, and gateway contract checks. ChangesERC7786 bridge documentation
Priority: ⬇️ Low Estimated code review effort: 1 (Trivial) | ~5 minutes Suggested reviewers: Merge Risk: 🔵 Low · up to Bridge execution is unaffected, but integrators would receive inaccurate guidance for observable gateway and recipient failure paths. Correct these descriptions before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@contracts/crosschain/ERC7786OpenBridge.sol`:
- Around line 107-112: Update the documentation comment in the aggregate
gateway-send logic to remove “oversized returndata” as an ABI-decoding failure
example, while retaining truncated or otherwise undecodable returndata as valid
examples. Do not change the gateway call behavior or surrounding error-isolation
semantics.
- Around line 189-191: Update the NatSpec around receiveMessage and its invalid
recipient return-value handling to name
ERC7786OpenBridgeInvalidExecutionReturnValue() as the observable revert. Replace
the inaccurate reference to Solidity’s canonical revert while preserving the
existing description of the expected magic value and delivery behavior.
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contracts/crosschain/ERC7786OpenBridge.sol
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- Drop the "undeliverable messages" trailer and the try/catch-scope prose from `sendMessage` NatSpec (implied by the "not enforced" note and by the general trust-in-gateways statement). - Move the try/catch rationale into an inline comment at the call site, where the choice actually lives. - Drop the "This is deliberate…" justification from `receiveMessage` NatSpec and instead name `ERC7786OpenBridgeInvalidExecutionReturnValue` as the observable revert on wrong magic value. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Consolidates NatSpec follow-ups from a series of external reports on
ERC7786OpenBridgewhose disposition depended on already-in-code but undocumented design intent. No behavior change.sendMessage: aligns withAxelarGatewayAdapter.sendMessageon the source-side non-validation of the recipient's address component (chain-only ERC-7930 recipients, non-contract targets), and states that the per-gateway `try`/`catch` isolates gateway reverts — not interface non-compliance from gateways that return EVM success with malformed returndata.receiveMessage: documents that the public retry path only performs work once the threshold has already been reached from gateway deliveries (a non-gateway caller against a fresh or rolled-back tracker returns the magic value without executing anything), and frames the wrong-return-value revert as a deliberate signal treating a non-conforming recipient as the interface-violating party rather than the bridge._addGateway: states that registering a gateway trusts it to implement the ERC-7786 interface correctly (non-conformance is the operator's responsibility to rotate out via `removeGateway`), and clarifies that the `code.length > 0` check is a fat-finger guard against plain EOAs — not an interface attestation, and in particular passing for EIP-7702 delegated EOAs.Test plan
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