use crate::Bytes;
use core::ops::Deref;
use ethereum_types::{H160, H256, U256};
use rlp::{Decodable, DecoderError, Encodable, Rlp, RlpStream};
use sha3::{Digest, Keccak256};
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "with-codec", derive(codec::Encode, codec::Decode))]
#[cfg_attr(feature = "with-serde", derive(serde::Serialize, serde::Deserialize))]
pub enum TransactionAction {
Call(H160),
Create,
}
impl Encodable for TransactionAction {
fn rlp_append(&self, s: &mut RlpStream) {
match self {
Self::Call(address) => {
s.encoder().encode_value(&address[..]);
}
Self::Create => s.encoder().encode_value(&[]),
}
}
}
impl Decodable for TransactionAction {
fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
if rlp.is_empty() {
if rlp.is_data() {
Ok(TransactionAction::Create)
} else {
Err(DecoderError::RlpExpectedToBeData)
}
} else {
Ok(TransactionAction::Call(rlp.as_val()?))
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "with-codec", derive(codec::Encode, codec::Decode))]
#[cfg_attr(feature = "with-serde", derive(serde::Serialize, serde::Deserialize))]
pub struct TransactionRecoveryId(pub u64);
impl Deref for TransactionRecoveryId {
type Target = u64;
fn deref(&self) -> &u64 {
&self.0
}
}
impl TransactionRecoveryId {
pub fn standard(&self) -> u8 {
if self.0 == 27 || self.0 == 28 || self.0 > 36 {
((self.0 - 1) % 2) as u8
} else {
4
}
}
pub fn chain_id(&self) -> Option<u64> {
if self.0 > 36 {
Some((self.0 - 35) / 2)
} else {
None
}
}
}
#[derive(Clone, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "with-serde", derive(serde::Serialize, serde::Deserialize))]
pub struct TransactionSignature {
v: TransactionRecoveryId,
r: H256,
s: H256,
}
impl TransactionSignature {
#[must_use]
pub fn new(v: u64, r: H256, s: H256) -> Option<Self> {
const LOWER: H256 = H256([
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01,
]);
const UPPER: H256 = H256([
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xfe, 0xba, 0xae, 0xdc, 0xe6, 0xaf, 0x48, 0xa0, 0x3b, 0xbf, 0xd2, 0x5e, 0x8c,
0xd0, 0x36, 0x41, 0x41,
]);
let v = TransactionRecoveryId(v);
let is_valid = v.standard() <= 1 && r < UPPER && r >= LOWER && s < UPPER && s >= LOWER;
if is_valid {
Some(Self { v, r, s })
} else {
None
}
}
#[must_use]
pub fn v(&self) -> u64 {
self.v.0
}
#[must_use]
pub fn standard_v(&self) -> u8 {
self.v.standard()
}
#[must_use]
pub fn chain_id(&self) -> Option<u64> {
self.v.chain_id()
}
#[must_use]
pub fn r(&self) -> &H256 {
&self.r
}
#[must_use]
pub fn s(&self) -> &H256 {
&self.s
}
#[must_use]
pub fn is_low_s(&self) -> bool {
const LOWER: H256 = H256([
0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0x5d, 0x57, 0x6e, 0x73, 0x57, 0xa4, 0x50, 0x1d, 0xdf, 0xe9, 0x2f, 0x46,
0x68, 0x1b, 0x20, 0xa0,
]);
self.s <= LOWER
}
}
#[cfg(feature = "codec")]
impl codec::Encode for TransactionSignature {
fn size_hint(&self) -> usize {
codec::Encode::size_hint(&(self.v.0, self.r, self.s))
}
fn using_encoded<R, F: FnOnce(&[u8]) -> R>(&self, f: F) -> R {
codec::Encode::using_encoded(&(self.v.0, self.r, self.s), f)
}
}
#[cfg(feature = "codec")]
impl codec::Decode for TransactionSignature {
fn decode<I: codec::Input>(value: &mut I) -> Result<Self, codec::Error> {
let (v, r, s) = codec::Decode::decode(value)?;
match Self::new(v, r, s) {
Some(signature) => Ok(signature),
None => Err(codec::Error::from("Invalid signature")),
}
}
}
#[derive(Clone, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "with-codec", derive(codec::Encode, codec::Decode))]
pub struct TransactionMessage {
pub nonce: U256,
pub gas_price: U256,
pub gas_limit: U256,
pub action: TransactionAction,
pub value: U256,
pub input: Bytes,
pub chain_id: Option<u64>,
}
impl Encodable for TransactionMessage {
fn rlp_append(&self, s: &mut RlpStream) {
if let Some(chain_id) = self.chain_id {
s.begin_list(9);
s.append(&self.nonce);
s.append(&self.gas_price);
s.append(&self.gas_limit);
s.append(&self.action);
s.append(&self.value);
s.append(&self.input);
s.append(&chain_id);
s.append(&0_u8);
s.append(&0_u8);
} else {
s.begin_list(6);
s.append(&self.nonce);
s.append(&self.gas_price);
s.append(&self.gas_limit);
s.append(&self.action);
s.append(&self.value);
s.append(&self.input);
}
}
}
impl TransactionMessage {
pub fn hash(&self) -> H256 {
H256::from_slice(Keccak256::digest(&rlp::encode(self)).as_slice())
}
}
impl From<Transaction> for TransactionMessage {
fn from(t: Transaction) -> TransactionMessage {
TransactionMessage {
nonce: t.nonce,
gas_price: t.gas_price,
gas_limit: t.gas_limit,
action: t.action,
value: t.value,
input: t.input,
chain_id: t.signature.chain_id(),
}
}
}
#[derive(Clone, Debug, PartialEq, Eq)]
#[cfg_attr(feature = "with-codec", derive(codec::Encode, codec::Decode))]
#[cfg_attr(feature = "with-serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Transaction {
pub nonce: U256,
pub gas_price: U256,
pub gas_limit: U256,
pub action: TransactionAction,
pub value: U256,
pub input: Bytes,
pub signature: TransactionSignature,
}
impl Encodable for Transaction {
fn rlp_append(&self, s: &mut RlpStream) {
s.begin_list(9);
s.append(&self.nonce);
s.append(&self.gas_price);
s.append(&self.gas_limit);
s.append(&self.action);
s.append(&self.value);
s.append(&self.input);
s.append(&self.signature.v.0);
s.append(&U256::from_big_endian(&self.signature.r[..]));
s.append(&U256::from_big_endian(&self.signature.s[..]));
}
}
impl Decodable for Transaction {
fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
if rlp.item_count()? != 9 {
return Err(DecoderError::RlpIncorrectListLen);
}
let v = rlp.val_at(6)?;
let r = {
let mut rarr = [0_u8; 32];
rlp.val_at::<U256>(7)?.to_big_endian(&mut rarr);
H256::from(rarr)
};
let s = {
let mut sarr = [0_u8; 32];
rlp.val_at::<U256>(8)?.to_big_endian(&mut sarr);
H256::from(sarr)
};
let signature = TransactionSignature::new(v, r, s)
.ok_or(DecoderError::Custom("Invalid transaction signature format"))?;
Ok(Self {
nonce: rlp.val_at(0)?,
gas_price: rlp.val_at(1)?,
gas_limit: rlp.val_at(2)?,
action: rlp.val_at(3)?,
value: rlp.val_at(4)?,
input: rlp.val_at(5)?,
signature,
})
}
}
#[cfg(test)]
mod tests {
use super::*;
use hex_literal::hex;
#[test]
fn can_decode_raw_transaction() {
let bytes = hex!("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");
assert!(rlp::decode::<Transaction>(&bytes[..]).is_ok());
}
}