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transaction_from_raw.go
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transaction_from_raw.go
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package eth
import (
"reflect"
"strings"
"github.com/pkg/errors"
"github.com/INFURA/go-ethlibs/rlp"
)
// FromRaw populates a Transaction's fields from the raw transaction data supplied as a hexadecimal encoded string.
// For pre-EIP-2718 legacy transactions the input string is an RLP-encoded list, for transaction types defined
// after EIP-2718 the payload format depends on the transaction type included as the first byte.
// Unsigned transactions where R, S, and V are zero are not currently supported.
func (t *Transaction) FromRaw(input string) error {
// Code was originally heavily inspired by ethers.js v4 utils.transaction.parse:
// https://github.com/ethers-io/ethers.js/blob/v4-legacy/utils/transaction.js#L90
// Copyright (c) 2017 Richard Moore
//
// However it's since been somewhat extensively rewritten to support EIP-2718 and -2930
var (
chainId Quantity
nonce Quantity
gasPrice Quantity
gasLimit Quantity
maxPriorityFeePerGas Quantity
maxFeePerGas Quantity
to *Address
value Quantity
data Input
v Quantity
r Quantity
s Quantity
accessList AccessList
maxFeePerBlobGas Quantity
blobVersionedHashes []Hash
)
if !strings.HasPrefix(input, "0x") {
return errors.New("input must start with 0x")
}
if len(input) < 4 {
return errors.New("not enough input to decode")
}
var firstByte byte
if prefix, err := NewData(input[:4]); err != nil {
return errors.Wrap(err, "could not inspect transaction prefix")
} else {
firstByte = prefix.Bytes()[0]
}
switch {
case firstByte == byte(TransactionTypeAccessList):
// EIP-2930 transaction
payload := "0x" + input[4:]
if err := rlpDecodeList(payload, &chainId, &nonce, &gasPrice, &gasLimit, &to, &value, &data, &accessList, &v, &r, &s); err != nil {
return errors.Wrap(err, "could not decode RLP components")
}
if r.Int64() == 0 && s.Int64() == 0 {
return errors.New("unsigned transactions not supported")
}
t.Type = OptionalQuantityFromInt(int(firstByte))
t.Nonce = nonce
t.GasPrice = &gasPrice
t.Gas = gasLimit
t.To = to
t.Value = value
t.Input = data
t.AccessList = &accessList
t.V = v
t.YParity = &v
t.R = r
t.S = s
t.ChainId = &chainId
signingHash, err := t.SigningHash(chainId)
if err != nil {
return err
}
signature, err := NewEIP2718Signature(chainId, r, s, v)
if err != nil {
return err
}
sender, err := signature.Recover(signingHash)
if err != nil {
return err
}
raw, err := t.RawRepresentation()
if err != nil {
return err
}
t.Hash = raw.Hash()
t.From = *sender
return nil
case firstByte == byte(TransactionTypeDynamicFee):
// EIP-1559 transaction
payload := "0x" + input[4:]
// 0x02 || rlp([chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gasLimit, to, value, data, access_list, signatureYParity, signatureR, signatureS])
if err := rlpDecodeList(payload, &chainId, &nonce, &maxPriorityFeePerGas, &maxFeePerGas, &gasLimit, &to, &value, &data, &accessList, &v, &r, &s); err != nil {
return errors.Wrap(err, "could not decode RLP components")
}
if r.Int64() == 0 && s.Int64() == 0 {
return errors.New("unsigned transactions not supported")
}
t.Type = OptionalQuantityFromInt(int(firstByte))
t.Nonce = nonce
t.MaxPriorityFeePerGas = &maxPriorityFeePerGas
t.MaxFeePerGas = &maxFeePerGas
t.Gas = gasLimit
t.To = to
t.Value = value
t.Input = data
t.AccessList = &accessList
t.V = v
t.YParity = &v
t.R = r
t.S = s
t.ChainId = &chainId
signingHash, err := t.SigningHash(chainId)
if err != nil {
return err
}
signature, err := NewEIP2718Signature(chainId, r, s, v)
if err != nil {
return err
}
sender, err := signature.Recover(signingHash)
if err != nil {
return err
}
raw, err := t.RawRepresentation()
if err != nil {
return err
}
t.Hash = raw.Hash()
t.From = *sender
return nil
case firstByte == byte(TransactionTypeBlob):
// EIP-4844 transaction
var (
body rlp.Value
blobs []Data
commitments []Data
proofs []Data
hasBlobs bool = false
)
// The raw tx can be a full "Network Representation" tx of the form:
// 0x03 || rlp([tx_payload_body, blobs, commitments, proofs])
//
// Or just the tx payload body:
// 0x03 || rlp([chain_id, nonce, max_priority_fee_per_gas, max_fee_per_gas, gas_limit, to, value, data, access_list, max_fee_per_blob_gas, blob_versioned_hashes, y_parity, r, s])
payload := "0x" + input[4:]
decoded, err := rlp.From(payload)
switch len(decoded.List) {
case 14:
body = *decoded
hasBlobs = false
case 4:
// TransactionPayloadBody is itself an RLP list of:
// [chain_id, nonce, max_priority_fee_per_gas, max_fee_per_gas, gas_limit, to, value, data, access_list, max_fee_per_blob_gas, blob_versioned_hashes, y_parity, r, s]
if err := rlpDecodeList(decoded, &body, &blobs, &commitments, &proofs); err != nil {
return err
}
hasBlobs = true
default:
return errors.New("blob transaction invalid tx RLP length")
}
if err := rlpDecodeList(&body, &chainId, &nonce, &maxPriorityFeePerGas, &maxFeePerGas, &gasLimit, &to, &value, &data, &accessList, &maxFeePerBlobGas, &blobVersionedHashes, &v, &r, &s); err != nil {
return errors.Wrap(err, "could not decode RLP components")
}
if hasBlobs && (len(blobVersionedHashes) != len(blobs) || len(blobs) != len(commitments) || len(commitments) != len(proofs)) {
return errors.New("mismatched blob field counts")
}
// TODO: at this point we could verify these two constraints
//
// - blobVersionedHashes[i] = "0x01" + sha256(commitments[i])[4:]
// - the KZG commitments match the corresponding blobs and proofs
//
// However, this all requires additionally implementing a sha256 method
// for eth.Data and the use of a KZG proof framework, both of which
// feel outside the scope of this package, especially considering
// that these fields are not exposed at the JSONRPC layer which is
// our primary focus.
//
// In pseudocode this all would look something like:
//
// for i := range blobVersionedHashes {
// blobHash := commitments[i].Sha256()
// versionedHash := "0x01" + blobHash[4:]
// if blobVersionedHashes[i] != versionedHash {
// return errors.New("incorrect blob versioned hash")
// }
// if err := kzg_verify_proofs(commitments[i], blobs[i], proofs[i]); err != nil {
// return err
// }
// }
//
if r.Int64() == 0 && s.Int64() == 0 {
return errors.New("unsigned transactions not supported")
}
t.Type = OptionalQuantityFromInt(int(firstByte))
t.ChainId = &chainId
t.Nonce = nonce
t.MaxPriorityFeePerGas = &maxPriorityFeePerGas
t.MaxFeePerGas = &maxFeePerGas
t.Gas = gasLimit
t.To = to
t.Value = value
t.Input = data
t.AccessList = &accessList
t.MaxFeePerBlobGas = &maxFeePerBlobGas
t.BlobVersionedHashes = blobVersionedHashes
t.V = v
t.YParity = &v
t.R = r
t.S = s
if hasBlobs {
t.BlobBundle = &BlobsBundleV1{
Blobs: blobs,
Commitments: commitments,
Proofs: proofs,
}
} else {
t.BlobBundle = nil
}
signature, err := NewEIP2718Signature(chainId, r, s, v)
if err != nil {
return err
}
signingHash, err := t.SigningHash(signature.chainId)
if err != nil {
return err
}
sender, err := signature.Recover(signingHash)
if err != nil {
return err
}
raw, err := t.RawRepresentation()
if err != nil {
return err
}
t.Hash = raw.Hash()
t.From = *sender
return nil
case firstByte > 0x7f:
// In EIP-2718 types larger than 0x7f are reserved since they potentially conflict with legacy RLP encoded
// transactions. As such we can attempt to decode any such transactions as legacy format and attempt to
// decode the input string as an rlp.Value
if err := rlpDecodeList(input, &nonce, &gasPrice, &gasLimit, &to, &value, &data, &v, &r, &s); err != nil {
return errors.Wrap(err, "could not decode RLP components")
}
if r.Int64() == 0 && s.Int64() == 0 {
return errors.New("unsigned transactions not supported")
}
// ... and fill in all our fields with the decoded values
t.Nonce = nonce
t.GasPrice = &gasPrice
t.Gas = gasLimit
t.To = to
t.Value = value
t.Input = data
t.V = v
t.YParity = nil
t.R = r
t.S = s
signature, err := NewEIP155Signature(r, s, v)
if err != nil {
return err
}
signingHash, err := t.SigningHash(signature.chainId)
if err != nil {
return err
}
sender, err := signature.Recover(signingHash)
if err != nil {
return err
}
raw, err := t.RawRepresentation()
if err != nil {
return err
}
t.Hash = raw.Hash()
t.From = *sender
return nil
default:
return errors.New("unsupported transaction type")
}
}
// rlpDecodeList decodes an RLP list into the passed in receivers. Currently only the receiver types needed for
// legacy and EIP-2930 transactions are implemented, new receivers can easily be added in the for loop.
//
// input is either a string or pointer to an rlp.Value, if it's a string then it's assumed to be RLP encoded and is decoded first
//
// Note that when calling this function, the receivers MUST be pointers never values, and for "optional" receivers
// such as Address a pointer to a pointer must be passed. For example:
//
// var (
// addr *eth.Address
// nonce eth.Quantity
// )
// err := rlpDecodeList(payload, &addr, &nonce)
//
// TODO: Consider making this function public once all receiver types in the eth package are supported.
func rlpDecodeList(input interface{}, receivers ...interface{}) error {
var decoded *rlp.Value
switch i := input.(type) {
case string:
if d, err := rlp.From(i); err != nil {
return err
} else {
decoded = d
}
case *rlp.Value:
decoded = i
}
if len(decoded.List) < len(receivers) {
return errors.Errorf("expected %d items but only received %d", len(receivers), len(decoded.List))
}
for i := range receivers {
value := decoded.List[i]
switch receiver := receivers[i].(type) {
case *Quantity:
q, err := NewQuantityFromRLP(value)
if err != nil {
return errors.Wrapf(err, "could not decode list item %d to Quantity", i)
}
*receiver = *q
case **Address:
if value.String == "0x" {
*receiver = nil
} else {
a, err := NewAddress(value.String)
if err != nil {
return errors.Wrapf(err, "could not decode list item %d to Address", i)
}
*receiver = a
}
case *Input:
d, err := NewInput(value.String)
if err != nil {
return errors.Wrapf(err, "could not decode list item %d to Input", i)
}
*receiver = *d
case *Data:
d, err := NewData(value.String)
if err != nil {
return errors.Wrapf(err, "could not decode list item %d to Data", i)
}
*receiver = *d
case *[]Data:
*receiver = make([]Data, len(value.List))
for j := range value.List {
d, err := NewData(value.List[j].String)
if err != nil {
return errors.Wrapf(err, "could not decode list item %d %d to Data", i, j)
}
(*receiver)[j] = *d
}
case *[]Data32:
*receiver = make([]Data32, len(value.List))
for j := range value.List {
d, err := NewData32(value.List[j].String)
if err != nil {
return errors.Wrapf(err, "could not decode list item %d %d to Data", i, j)
}
(*receiver)[j] = *d
}
case *rlp.Value:
*receiver = value
case *AccessList:
accessList, err := NewAccessListFromRLP(value)
if err != nil {
return errors.Wrapf(err, "could not decode list item %d to AccessList", i)
}
*receiver = accessList
default:
return errors.Errorf("unsupported decode receiver %s", reflect.TypeOf(receiver).String())
}
}
return nil
}