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deposit.go
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deposit.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"
"strings"
"github.com/goccy/go-yaml"
"github.com/pkg/errors"
)
// Deposit provides information about a deposit.
type Deposit struct {
Proof [][]byte `dynssz-size:"DEPOSIT_CONTRACT_TREE_DEPTH+1,32" ssz-size:"33,32"`
Data *DepositData
}
// depositJSON is the spec representation of the struct.
type depositJSON struct {
Proof []string `json:"proof"`
Data *DepositData `json:"data"`
}
// depositYAML is the spec representation of the struct.
type depositYAML struct {
Proof []string `yaml:"proof"`
Data *DepositData `yaml:"data"`
}
// MarshalJSON implements json.Marshaler.
func (d *Deposit) MarshalJSON() ([]byte, error) {
proof := make([]string, len(d.Proof))
for i := range d.Proof {
proof[i] = fmt.Sprintf("%#x", d.Proof[i])
}
return json.Marshal(&depositJSON{
Proof: proof,
Data: d.Data,
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (d *Deposit) UnmarshalJSON(input []byte) error {
var depositJSON depositJSON
if err := json.Unmarshal(input, &depositJSON); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return d.unpack(&depositJSON)
}
func (d *Deposit) unpack(depositJSON *depositJSON) error {
var err error
if depositJSON.Proof == nil {
return errors.New("proof missing")
}
if len(depositJSON.Proof) != 33 {
return errors.New("incorrect length for proof")
}
d.Proof = make([][]byte, len(depositJSON.Proof))
for i := range depositJSON.Proof {
if depositJSON.Proof[i] == "" {
return errors.New("proof component missing")
}
if d.Proof[i], err = hex.DecodeString(strings.TrimPrefix(depositJSON.Proof[i], "0x")); err != nil {
return errors.Wrap(err, "invalid value for proof")
}
if len(d.Proof[i]) != 32 {
return fmt.Errorf("incorrect size %d for deposit proof", len(d.Proof[i]))
}
}
if depositJSON.Data == nil {
return errors.New("data missing")
}
d.Data = depositJSON.Data
return nil
}
// MarshalYAML implements yaml.Marshaler.
func (d *Deposit) MarshalYAML() ([]byte, error) {
proof := make([]string, len(d.Proof))
for i := range d.Proof {
proof[i] = fmt.Sprintf("%#x", d.Proof[i])
}
yamlBytes, err := yaml.MarshalWithOptions(&depositYAML{
Proof: proof,
Data: d.Data,
}, yaml.Flow(true))
if err != nil {
return nil, err
}
return bytes.ReplaceAll(yamlBytes, []byte(`"`), []byte(`'`)), nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (d *Deposit) UnmarshalYAML(input []byte) error {
// We unmarshal to the JSON struct to save on duplicate code.
var depositJSON depositJSON
if err := yaml.Unmarshal(input, &depositJSON); err != nil {
return err
}
return d.unpack(&depositJSON)
}
// String returns a string version of the structure.
func (d *Deposit) String() string {
data, err := yaml.Marshal(d)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}