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proof.go
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proof.go
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package client
import (
"encoding/hex"
"encoding/json"
"fmt"
"math/big"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/rlp"
)
type StateProof struct {
Balance big.Int
CodeHash [32]byte
Nonce uint64
StorageHash [32]byte
AccountProofRLP []byte
StorageProofRLP [][]byte
}
func (cl ETHClient) GetProof(address common.Address, storageKeys [][]byte, blockNumber *big.Int) (*StateProof, error) {
bz, err := cl.getProof(address, storageKeys, "0x"+blockNumber.Text(16))
if err != nil {
return nil, err
}
var proof struct {
Balance string `json:"balance"`
CodeHash string `json:"codeHash"`
Nonce string `json:"nonce"`
StorageHash string `json:"storageHash"`
AccountProof []string `json:"accountProof"`
StorageProof []struct {
Proof []string `json:"proof"`
} `json:"storageProof"`
}
if err := json.Unmarshal(bz, &proof); err != nil {
return nil, err
}
var balance big.Int
{
bz, err := decodeHexString(proof.Balance)
if err != nil {
return nil, err
}
balance.SetBytes(bz)
}
var codeHash [32]byte
{
bz, err := decodeHexString(proof.CodeHash)
if err != nil {
return nil, err
}
copy(codeHash[:], bz)
}
var nonce big.Int
{
bz, err := decodeHexString(proof.Nonce)
if err != nil {
return nil, err
}
nonce.SetBytes(bz)
}
var storageHash [32]byte
{
bz, err := decodeHexString(proof.StorageHash)
if err != nil {
return nil, err
}
copy(storageHash[:], bz)
}
var encodedProof = StateProof{
Balance: balance,
CodeHash: codeHash,
Nonce: nonce.Uint64(),
StorageHash: storageHash,
}
encodedProof.AccountProofRLP, err = encodeRLP(proof.AccountProof)
if err != nil {
return nil, err
}
for _, p := range proof.StorageProof {
bz, err := encodeRLP(p.Proof)
if err != nil {
return nil, err
}
encodedProof.StorageProofRLP = append(encodedProof.StorageProofRLP, bz)
}
return &encodedProof, nil
}
func (cl ETHClient) getProof(address common.Address, storageKeys [][]byte, blockNumber string) ([]byte, error) {
hashes := []common.Hash{}
for _, k := range storageKeys {
var h common.Hash
if err := h.UnmarshalText(k); err != nil {
return nil, err
}
hashes = append(hashes, h)
}
var msg json.RawMessage
if err := cl.Raw().Call(&msg, "eth_getProof", address, hashes, blockNumber); err != nil {
return nil, err
}
return msg, nil
}
func encodeRLP(proof []string) ([]byte, error) {
var target [][][]byte
for _, p := range proof {
bz, err := decodeHexString(p)
if err != nil {
return nil, err
}
var val [][]byte
if err := rlp.DecodeBytes(bz, &val); err != nil {
return nil, err
}
target = append(target, val)
}
bz, err := rlp.EncodeToBytes(target)
if err != nil {
return nil, err
}
return bz, nil
}
func decodeHexString(s string) ([]byte, error) {
if !strings.HasPrefix(s, "0x") {
return nil, fmt.Errorf("missing prefix '0x': %v", s)
}
s = s[2:]
if len(s)%2 != 0 {
s = "0" + s
}
return hex.DecodeString(s)
}