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add slot validation to attestation_data endpoint (#1888)

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## Issue Addressed

Resolves #1801

## Proposed Changes

Verify queries to `attestation_data` are for no later than `current_slot + 1`. If they are later than this, return a 400.


Co-authored-by: realbigsean <seananderson33@gmail.com>
This commit is contained in:
realbigsean 2020-11-16 02:59:35 +00:00
parent 8a16548715
commit 6a7d221f72
1 changed files with 12 additions and 0 deletions
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12
beacon_node/http_api/src/lib.rs
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@ -1582,6 +1582,18 @@ pub fn serve<T: BeaconChainTypes>(
.and_then(
|query: api_types::ValidatorAttestationDataQuery, chain: Arc<BeaconChain<T>>| {
blocking_json_task(move || {
let current_slot = chain
.slot()
.map_err(warp_utils::reject::beacon_chain_error)?;
// allow a tolerance of one slot to account for clock skew
if query.slot > current_slot + 1 {
return Err(warp_utils::reject::custom_bad_request(format!(
"request slot {} is more than one slot past the current slot {}",
query.slot, current_slot
)));
}
chain
.produce_unaggregated_attestation(query.slot, query.committee_index)
.map(|attestation| attestation.data)