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depositmessage.go
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depositmessage.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"
)
// DepositMessage provides information about a deposit made on Ethereum 1.
type DepositMessage struct {
PublicKey BLSPubKey `ssz-size:"48"`
WithdrawalCredentials []byte `ssz-size:"32"`
Amount Gwei
}
// depositMessageJSON is the spec representation of the struct.
type depositMessageJSON struct {
PublicKey string `json:"pubkey"`
WithdrawalCredentials string `json:"withdrawal_credentials"`
Amount string `json:"amount"`
}
// depositMessageYAML is the spec representation of the struct.
type depositMessageYAML struct {
PublicKey string `yaml:"pubkey"`
WithdrawalCredentials string `yaml:"withdrawal_credentials"`
Amount uint64 `yaml:"amount"`
}
// MarshalJSON implements json.Marshaler.
func (d *DepositMessage) MarshalJSON() ([]byte, error) {
return json.Marshal(&depositMessageJSON{
PublicKey: fmt.Sprintf("%#x", d.PublicKey),
WithdrawalCredentials: fmt.Sprintf("%#x", d.WithdrawalCredentials),
Amount: fmt.Sprintf("%d", d.Amount),
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (d *DepositMessage) UnmarshalJSON(input []byte) error {
var depositMessageJSON depositMessageJSON
if err := json.Unmarshal(input, &depositMessageJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return d.unpack(&depositMessageJSON)
}
func (d *DepositMessage) unpack(depositMessageJSON *depositMessageJSON) error {
if depositMessageJSON.PublicKey == "" {
return errors.New("public key missing")
}
publicKey, err := hex.DecodeString(strings.TrimPrefix(depositMessageJSON.PublicKey, "0x"))
if err != nil {
return errors.Wrap(err, "invalid value for public key")
}
if len(publicKey) != PublicKeyLength {
return errors.New("incorrect length for public key")
}
copy(d.PublicKey[:], publicKey)
if depositMessageJSON.WithdrawalCredentials == "" {
return errors.New("withdrawal credentials missing")
}
if d.WithdrawalCredentials, err = hex.DecodeString(strings.TrimPrefix(depositMessageJSON.WithdrawalCredentials, "0x")); err != nil {
return errors.Wrap(err, "invalid value for withdrawal credentials")
}
if len(d.WithdrawalCredentials) != HashLength {
return errors.New("incorrect length for withdrawal credentials")
}
if depositMessageJSON.Amount == "" {
return errors.New("amount missing")
}
amount, err := strconv.ParseUint(depositMessageJSON.Amount, 10, 64)
if err != nil {
return errors.Wrap(err, "invalid value for amount")
}
d.Amount = Gwei(amount)
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (d *DepositMessage) MarshalYAML() ([]byte, error) {
yamlBytes, err := yaml.MarshalWithOptions(&depositMessageYAML{
PublicKey: fmt.Sprintf("%#x", d.PublicKey),
WithdrawalCredentials: fmt.Sprintf("%#x", d.WithdrawalCredentials),
Amount: uint64(d.Amount),
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (d *DepositMessage) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var depositMessageJSON depositMessageJSON
if err := yaml.Unmarshal(input, &depositMessageJSON); err != nil {
return err
}
return d.unpack(&depositMessageJSON)
}
// String returns a string version of the structure.
func (d *DepositMessage) String() string {
data, err := yaml.Marshal(d)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}