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signsynccommitteeselection.go
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signsynccommitteeselection.go
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// Copyright © 2021 Attestant Limited.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package standard
import (
"context"
"github.com/attestantio/go-eth2-client/spec/altair"
"github.com/attestantio/go-eth2-client/spec/phase0"
"github.com/pkg/errors"
e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
)
// SignSyncCommitteeSelection returns a sync committee selection signature.
// This signs a slot and subcommittee with the "sync committee selection proof" domain.
func (s *Service) SignSyncCommitteeSelection(ctx context.Context,
account e2wtypes.Account,
slot phase0.Slot,
subcommitteeIndex uint64,
) (
phase0.BLSSignature,
error,
) {
if s.syncCommitteeSelectionProofDomainType == nil {
return phase0.BLSSignature{}, errors.New("no sync committee selection proof domain type, cannot sign")
}
// Calculate the domain.
domain, err := s.domainProvider.Domain(ctx,
*s.syncCommitteeSelectionProofDomainType,
phase0.Epoch(slot/s.slotsPerEpoch))
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to obtain signature domain for sync committee selection proof")
}
selectionData := &altair.SyncAggregatorSelectionData{
Slot: slot,
SubcommitteeIndex: subcommitteeIndex,
}
root, err := selectionData.HashTreeRoot()
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to obtain hash tree root of sync aggregator selection data")
}
sig, err := s.sign(ctx, account, root, domain)
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to sign sync committee selection proof")
}
return sig, nil
}