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signbeaconattestation.go
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signbeaconattestation.go
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// Copyright © 2020 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/phase0"
"github.com/pkg/errors"
e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
)
// SignBeaconAttestation signs a beacon attestation item.
func (s *Service) SignBeaconAttestation(ctx context.Context,
account e2wtypes.Account,
slot phase0.Slot,
committeeIndex phase0.CommitteeIndex,
blockRoot phase0.Root,
sourceEpoch phase0.Epoch,
sourceRoot phase0.Root,
targetEpoch phase0.Epoch,
targetRoot phase0.Root,
) (
phase0.BLSSignature,
error,
) {
domain, err := s.domainProvider.Domain(ctx,
s.beaconAttesterDomainType,
phase0.Epoch(slot/s.slotsPerEpoch))
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to obtain signature domain for beacon attestation")
}
var sig phase0.BLSSignature
if protectingSigner, isProtectingSigner := account.(e2wtypes.AccountProtectingSigner); isProtectingSigner {
signature, err := protectingSigner.SignBeaconAttestation(ctx,
uint64(slot),
uint64(committeeIndex),
blockRoot[:],
uint64(sourceEpoch),
sourceRoot[:],
uint64(targetEpoch),
targetRoot[:],
domain[:])
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to sign beacon attestation")
}
copy(sig[:], signature.Marshal())
} else {
attestation := &phase0.AttestationData{
Slot: slot,
Index: committeeIndex,
BeaconBlockRoot: blockRoot,
Source: &phase0.Checkpoint{
Epoch: sourceEpoch,
Root: sourceRoot,
},
Target: &phase0.Checkpoint{
Epoch: targetEpoch,
Root: targetRoot,
},
}
root, err := attestation.HashTreeRoot()
if err != nil {
return phase0.BLSSignature{}, errors.Wrap(err, "failed to generate hash tree root")
}
sig, err = s.sign(ctx, account, root, domain)
if err != nil {
return phase0.BLSSignature{}, err
}
}
return sig, nil
}