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depositinfo.go
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depositinfo.go
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// Copyright © 2019, 2020 Weald Technology Trading
// 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 util
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/pkg/errors"
)
// DepositInfo is a generic deposit structure.
type DepositInfo struct {
Name string
Account string
PublicKey []byte
WithdrawalCredentials []byte
Signature []byte
DepositDataRoot []byte
DepositMessageRoot []byte
ForkVersion []byte
Amount uint64
Version uint64
}
// depositInfoV1 is an ethdo V1 deposit structure.
type depositInfoV1 struct {
Name string `json:"name,omitempty"`
Account string `json:"account,omitempty"`
PublicKey string `json:"pubkey"`
WithdrawalCredentials string `json:"withdrawal_credentials"`
Signature string `json:"signature"`
DepositDataRoot string `json:"deposit_data_root"`
Value uint64 `json:"value"`
Version uint64 `json:"version"`
}
// depositInfoV3 is an ethdo V3 deposit structure.
type depositInfoV3 struct {
Name string `json:"name,omitempty"`
Account string `json:"account,omitempty"`
PublicKey string `json:"pubkey"`
WithdrawalCredentials string `json:"withdrawal_credentials"`
Signature string `json:"signature"`
DepositDataRoot string `json:"deposit_data_root"`
DepositMessageRoot string `json:"deposit_message_root"`
ForkVersion string `json:"fork_version"`
Amount uint64 `json:"amount"`
Version uint64 `json:"version"`
}
// depositInfoV3b is an alternative V3 deposit structure.
type depositInfoV3b struct {
Name string `json:"name,omitempty"`
Account string `json:"account,omitempty"`
PublicKey string `json:"validator_pubkey"`
WithdrawalCredentials string `json:"withdrawal_credentials"`
Signature string `json:"validator_signature"`
DepositDataRoot string `json:"deposit_data_root"`
DepositMessageRoot string `json:"deposit_message_root"`
ForkVersion string `json:"fork_version"`
Amount string `json:"amount"`
Version string `json:"data_version"`
}
// depositInfoCLI is a deposit structure from the eth2 deposit CLI.
type depositInfoCLI struct {
PublicKey string `json:"pubkey"`
WithdrawalCredentials string `json:"withdrawal_credentials"`
Signature string `json:"signature"`
DepositDataRoot string `json:"deposit_data_root"`
DepositMessageRoot string `json:"deposit_message_root"`
ForkVersion string `json:"fork_version"`
Amount uint64 `json:"amount"`
}
// depositInfoAPIV4 is an API V4 deposit structure.
type depositInfoAPIV4 struct {
PublicKey string `json:"validator_pubkey"`
WithdrawalCredentials string `json:"withdrawal_credentials"`
Signature string `json:"validator_signature"`
DepositDataRoot string `json:"deposit_data_root"`
DepositMessageRoot string `json:"deposit_message_root"`
ForkVersion string `json:"fork_version"`
Amount string `json:"amount"`
Version string `json:"data_version"`
}
// DepositInfoFromJSON obtains deposit info from any supported JSON format.
func DepositInfoFromJSON(input []byte) ([]*DepositInfo, error) {
// Work out the type of data that we're dealing with, and decode it appropriately.
depositInfo, err := tryRawTxData(input)
if err != nil {
depositInfo, err = tryV3DepositInfoFromJSON(input)
if err != nil {
depositInfo, err = tryV3bDepositInfoFromJSON(input)
if err != nil {
depositInfo, err = tryV1DepositInfoFromJSON(input)
if err != nil {
depositInfo, err = tryAPIV4DepositInfoFromJSON(input)
if err != nil {
depositInfo, err = tryCLIDepositInfoFromJSON(input)
if err != nil {
// Give up
return nil, errors.New("unknown deposit data format")
}
}
}
}
}
}
if len(depositInfo) == 0 {
return nil, errors.New("no deposits supplied")
}
for i := range depositInfo {
if len(depositInfo[i].PublicKey) == 0 {
return nil, fmt.Errorf("no public key for deposit %d", i)
}
if len(depositInfo[i].DepositDataRoot) == 0 {
return nil, fmt.Errorf("no data root for deposit %d", i)
}
if len(depositInfo[i].Signature) == 0 {
return nil, fmt.Errorf("no signature for deposit %d", i)
}
if len(depositInfo[i].WithdrawalCredentials) == 0 {
return nil, fmt.Errorf("no withdrawal credentials for deposit %d", i)
}
}
return depositInfo, nil
}
func tryV3DepositInfoFromJSON(data []byte) ([]*DepositInfo, error) {
var depositData []*depositInfoV3
err := json.Unmarshal(data, &depositData)
if err != nil {
return nil, err
}
depositInfos := make([]*DepositInfo, len(depositData))
for i, deposit := range depositData {
if deposit.Version != 3 {
return nil, errors.New("incorrect V3 deposit version")
}
publicKey, err := hex.DecodeString(strings.TrimPrefix(deposit.PublicKey, "0x"))
if err != nil {
return nil, errors.New("public key invalid")
}
withdrawalCredentials, err := hex.DecodeString(strings.TrimPrefix(deposit.WithdrawalCredentials, "0x"))
if err != nil {
return nil, errors.New("withdrawal credentials invalid")
}
signature, err := hex.DecodeString(strings.TrimPrefix(deposit.Signature, "0x"))
if err != nil {
return nil, errors.New("signature invalid")
}
depositDataRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositDataRoot, "0x"))
if err != nil {
return nil, errors.New("deposit data root invalid")
}
depositMessageRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositMessageRoot, "0x"))
if err != nil {
return nil, errors.New("deposit message root invalid")
}
forkVersion, err := hex.DecodeString(strings.TrimPrefix(deposit.ForkVersion, "0x"))
if err != nil {
return nil, errors.New("fork version invalid")
}
depositInfos[i] = &DepositInfo{
Name: deposit.Name,
Account: deposit.Account,
PublicKey: publicKey,
WithdrawalCredentials: withdrawalCredentials,
Signature: signature,
DepositDataRoot: depositDataRoot,
DepositMessageRoot: depositMessageRoot,
ForkVersion: forkVersion,
Amount: deposit.Amount,
Version: 3,
}
}
return depositInfos, nil
}
func tryAPIV4DepositInfoFromJSON(data []byte) ([]*DepositInfo, error) {
var depositData []*depositInfoAPIV4
err := json.Unmarshal(data, &depositData)
if err != nil {
return nil, err
}
depositInfos := make([]*DepositInfo, len(depositData))
for i, deposit := range depositData {
if deposit.Version != "4" {
return nil, errors.New("incorrect V4 deposit version")
}
publicKey, err := hex.DecodeString(strings.TrimPrefix(deposit.PublicKey, "0x"))
if err != nil {
return nil, errors.New("public key invalid")
}
withdrawalCredentials, err := hex.DecodeString(strings.TrimPrefix(deposit.WithdrawalCredentials, "0x"))
if err != nil {
return nil, errors.New("withdrawal credentials invalid")
}
signature, err := hex.DecodeString(strings.TrimPrefix(deposit.Signature, "0x"))
if err != nil {
return nil, errors.New("signature invalid")
}
depositDataRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositDataRoot, "0x"))
if err != nil {
return nil, errors.New("deposit data root invalid")
}
depositMessageRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositMessageRoot, "0x"))
if err != nil {
return nil, errors.New("deposit message root invalid")
}
forkVersion, err := hex.DecodeString(strings.TrimPrefix(deposit.ForkVersion, "0x"))
if err != nil {
return nil, errors.New("fork version invalid")
}
amount, err := strconv.ParseUint(deposit.Amount, 10, 64)
if err != nil {
return nil, errors.New("amount invalid")
}
depositInfos[i] = &DepositInfo{
PublicKey: publicKey,
WithdrawalCredentials: withdrawalCredentials,
Signature: signature,
DepositDataRoot: depositDataRoot,
DepositMessageRoot: depositMessageRoot,
ForkVersion: forkVersion,
Amount: amount,
Version: 4,
}
}
return depositInfos, nil
}
func tryV3bDepositInfoFromJSON(data []byte) ([]*DepositInfo, error) {
var depositData []*depositInfoV3b
err := json.Unmarshal(data, &depositData)
if err != nil {
return nil, err
}
depositInfos := make([]*DepositInfo, len(depositData))
for i, deposit := range depositData {
version, err := strconv.ParseUint(deposit.Version, 10, 64)
if err != nil {
return nil, errors.New("invalid V3 deposit version")
}
if version != 3 {
return nil, errors.New("incorrect V3 deposit version")
}
publicKey, err := hex.DecodeString(strings.TrimPrefix(deposit.PublicKey, "0x"))
if err != nil {
return nil, errors.New("public key invalid")
}
withdrawalCredentials, err := hex.DecodeString(strings.TrimPrefix(deposit.WithdrawalCredentials, "0x"))
if err != nil {
return nil, errors.New("withdrawal credentials invalid")
}
signature, err := hex.DecodeString(strings.TrimPrefix(deposit.Signature, "0x"))
if err != nil {
return nil, errors.New("signature invalid")
}
depositDataRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositDataRoot, "0x"))
if err != nil {
return nil, errors.New("deposit data root invalid")
}
depositMessageRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositMessageRoot, "0x"))
if err != nil {
return nil, errors.New("deposit message root invalid")
}
forkVersion, err := hex.DecodeString(strings.TrimPrefix(deposit.ForkVersion, "0x"))
if err != nil {
return nil, errors.New("fork version invalid")
}
amount, err := strconv.ParseUint(deposit.Amount, 10, 64)
if err != nil {
return nil, errors.New("invalid V3 deposit amount")
}
depositInfos[i] = &DepositInfo{
Name: deposit.Name,
Account: deposit.Account,
PublicKey: publicKey,
WithdrawalCredentials: withdrawalCredentials,
Signature: signature,
DepositDataRoot: depositDataRoot,
DepositMessageRoot: depositMessageRoot,
ForkVersion: forkVersion,
Amount: amount,
Version: 3,
}
}
return depositInfos, nil
}
func tryCLIDepositInfoFromJSON(data []byte) ([]*DepositInfo, error) {
var depositData []*depositInfoCLI
err := json.Unmarshal(data, &depositData)
if err != nil {
return nil, err
}
depositInfos := make([]*DepositInfo, len(depositData))
for i, deposit := range depositData {
publicKey, err := hex.DecodeString(strings.TrimPrefix(deposit.PublicKey, "0x"))
if err != nil {
return nil, errors.New("public key invalid")
}
withdrawalCredentials, err := hex.DecodeString(strings.TrimPrefix(deposit.WithdrawalCredentials, "0x"))
if err != nil {
return nil, errors.New("withdrawal credentials invalid")
}
signature, err := hex.DecodeString(strings.TrimPrefix(deposit.Signature, "0x"))
if err != nil {
return nil, errors.New("signature invalid")
}
depositDataRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositDataRoot, "0x"))
if err != nil {
return nil, errors.New("deposit data root invalid")
}
depositMessageRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositMessageRoot, "0x"))
if err != nil {
return nil, errors.New("deposit message root invalid")
}
forkVersion, err := hex.DecodeString(strings.TrimPrefix(deposit.ForkVersion, "0x"))
if err != nil {
return nil, errors.New("fork version invalid")
}
depositInfos[i] = &DepositInfo{
PublicKey: publicKey,
WithdrawalCredentials: withdrawalCredentials,
Signature: signature,
DepositDataRoot: depositDataRoot,
DepositMessageRoot: depositMessageRoot,
ForkVersion: forkVersion,
Amount: deposit.Amount,
Version: 3,
}
}
return depositInfos, nil
}
func tryV1DepositInfoFromJSON(data []byte) ([]*DepositInfo, error) {
var depositData []*depositInfoV1
err := json.Unmarshal(data, &depositData)
if err != nil {
return nil, err
}
depositInfos := make([]*DepositInfo, len(depositData))
for i, deposit := range depositData {
if deposit.Version < 1 || deposit.Version > 2 {
return nil, errors.New("incorrect deposit version")
}
publicKey, err := hex.DecodeString(strings.TrimPrefix(deposit.PublicKey, "0x"))
if err != nil {
return nil, errors.New("public key invalid")
}
withdrawalCredentials, err := hex.DecodeString(strings.TrimPrefix(deposit.WithdrawalCredentials, "0x"))
if err != nil {
return nil, errors.New("withdrawal credentials invalid")
}
signature, err := hex.DecodeString(strings.TrimPrefix(deposit.Signature, "0x"))
if err != nil {
return nil, errors.New("signature invalid")
}
depositDataRoot, err := hex.DecodeString(strings.TrimPrefix(deposit.DepositDataRoot, "0x"))
if err != nil {
return nil, errors.New("deposit data root invalid")
}
depositInfos[i] = &DepositInfo{
Name: deposit.Name,
Account: deposit.Account,
PublicKey: publicKey,
WithdrawalCredentials: withdrawalCredentials,
Signature: signature,
DepositDataRoot: depositDataRoot,
Amount: deposit.Value,
Version: 3,
}
}
return depositInfos, nil
}
func tryRawTxData(data []byte) ([]*DepositInfo, error) {
txData, err := hex.DecodeString(strings.TrimPrefix(string(data), "0x"))
if err != nil {
return nil, errors.New("public key invalid")
}
depositInfos := make([]*DepositInfo, 1)
if len(txData) != 420 {
return nil, errors.New("invalid transaction length")
}
if !bytes.Equal(txData[0:4], []byte{0x22, 0x89, 0x51, 0x18}) {
return nil, errors.New("invalid function signature")
}
depositInfos[0] = &DepositInfo{
PublicKey: txData[164:212],
WithdrawalCredentials: txData[260:292],
Signature: txData[324:420],
DepositDataRoot: txData[100:132],
}
return depositInfos, nil
}