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aggregateandproof.go
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aggregateandproof.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 phase0
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/goccy/go-yaml"
"github.com/pkg/errors"
)
// AggregateAndProof is the Ethereum 2 attestation structure.
type AggregateAndProof struct {
AggregatorIndex ValidatorIndex
Aggregate *Attestation
SelectionProof BLSSignature `ssz-size:"96"`
}
// aggregateAndProofJSON is the spec representation of the struct.
type aggregateAndProofJSON struct {
AggregatorIndex string `json:"aggregator_index"`
Aggregate *Attestation `json:"aggregate"`
SelectionProof string `json:"selection_proof"`
}
// aggregateAndProofYAML is the spec representation of the struct.
type aggregateAndProofYAML struct {
AggregatorIndex uint64 `yaml:"aggregator_index"`
Aggregate *Attestation `yaml:"aggregate"`
SelectionProof string `yaml:"selection_proof"`
}
// MarshalJSON implements json.Marshaler.
func (a *AggregateAndProof) MarshalJSON() ([]byte, error) {
return json.Marshal(&aggregateAndProofJSON{
AggregatorIndex: fmt.Sprintf("%d", a.AggregatorIndex),
Aggregate: a.Aggregate,
SelectionProof: fmt.Sprintf("%#x", a.SelectionProof),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (a *AggregateAndProof) UnmarshalJSON(input []byte) error {
var aggregateAndProofJSON aggregateAndProofJSON
if err := json.Unmarshal(input, &aggregateAndProofJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return a.unpack(&aggregateAndProofJSON)
}
func (a *AggregateAndProof) unpack(aggregateAndProofJSON *aggregateAndProofJSON) error {
if aggregateAndProofJSON.AggregatorIndex == "" {
return errors.New("aggregator index missing")
}
aggregatorIndex, err := strconv.ParseUint(aggregateAndProofJSON.AggregatorIndex, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for aggregator index")
}
a.AggregatorIndex = ValidatorIndex(aggregatorIndex)
if aggregateAndProofJSON.Aggregate == nil {
return errors.New("aggregate missing")
}
a.Aggregate = aggregateAndProofJSON.Aggregate
if aggregateAndProofJSON.SelectionProof == "" {
return errors.New("selection proof missing")
}
selectionProof, err := hex.DecodeString(strings.TrimPrefix(aggregateAndProofJSON.SelectionProof, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for selection proof")
}
if len(selectionProof) != SignatureLength {
return errors.New("incorrect length for selection proof")
}
copy(a.SelectionProof[:], selectionProof)
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (a *AggregateAndProof) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(&aggregateAndProofYAML{
AggregatorIndex: uint64(a.AggregatorIndex),
Aggregate: a.Aggregate,
SelectionProof: fmt.Sprintf("%#x", a.SelectionProof),
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (a *AggregateAndProof) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var aggregateAndProofJSON aggregateAndProofJSON
if err := yaml.Unmarshal(input, &aggregateAndProofJSON); err != nil {
return err
}
return a.unpack(&aggregateAndProofJSON)
}
// String returns a string version of the structure.
func (a *AggregateAndProof) String() string {
data, err := yaml.Marshal(a)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}