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mod errors;
mod network;
mod payload;
mod protocol;
pub use self::errors::Error;
pub use self::network::Network;
pub use self::payload::Payload;
pub use self::protocol::Protocol;
use data_encoding::Encoding;
use data_encoding_macro::{internal_new_encoding, new_encoding};
use encoding::{blake2b_variable, de, ser, serde_bytes, Cbor};
use std::fmt;
use std::hash::Hash;
use std::str::FromStr;
const ADDRESS_ENCODER: Encoding = new_encoding! {
symbols: "abcdefghijklmnopqrstuvwxyz234567",
padding: None,
};
pub const PAYLOAD_HASH_LEN: usize = 20;
pub const SECP_PUB_LEN: usize = 65;
pub const BLS_PUB_LEN: usize = 48;
pub const CHECKSUM_HASH_LEN: usize = 4;
const MAX_ADDRESS_LEN: usize = 84 + 2;
const MAINNET_PREFIX: &str = "f";
const TESTNET_PREFIX: &str = "t";
const NETWORK_DEFAULT: Network = Network::Testnet;
#[derive(PartialEq, Eq, Clone, Debug, Hash, Copy)]
pub struct Address {
network: Network,
payload: Payload,
}
impl Address {
fn new(network: Network, protocol: Protocol, bz: &[u8]) -> Result<Self, Error> {
Ok(Self {
network,
payload: Payload::new(protocol, bz)?,
})
}
pub fn from_bytes(bz: &[u8]) -> Result<Self, Error> {
if bz.len() < 2 {
Err(Error::InvalidLength)
} else {
let protocol = Protocol::from_byte(bz[0]).ok_or(Error::UnknownProtocol)?;
Self::new(NETWORK_DEFAULT, protocol, &bz[1..])
}
}
pub fn new_id(id: u64) -> Self {
Self {
network: NETWORK_DEFAULT,
payload: Payload::ID(id),
}
}
pub fn new_secp256k1(pubkey: &[u8]) -> Result<Self, Error> {
if pubkey.len() != 65 {
return Err(Error::InvalidSECPLength(pubkey.len()));
}
Ok(Self {
network: NETWORK_DEFAULT,
payload: Payload::Secp256k1(address_hash(pubkey)),
})
}
pub fn new_actor(data: &[u8]) -> Self {
Self {
network: NETWORK_DEFAULT,
payload: Payload::Actor(address_hash(data)),
}
}
pub fn new_bls(pubkey: &[u8]) -> Result<Self, Error> {
if pubkey.len() != BLS_PUB_LEN {
return Err(Error::InvalidBLSLength(pubkey.len()));
}
let mut key = [0u8; BLS_PUB_LEN];
key.copy_from_slice(pubkey);
Ok(Self {
network: NETWORK_DEFAULT,
payload: Payload::BLS(key.into()),
})
}
pub fn protocol(&self) -> Protocol {
Protocol::from(self.payload)
}
pub fn payload(&self) -> &Payload {
&self.payload
}
pub fn payload_bytes(&self) -> Vec<u8> {
self.payload.to_raw_bytes()
}
pub fn network(&self) -> Network {
self.network
}
pub fn set_network(&mut self, network: Network) -> &mut Self {
self.network = network;
self
}
pub fn to_bytes(&self) -> Vec<u8> {
self.payload.to_bytes()
}
}
impl fmt::Display for Address {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", encode(self))
}
}
impl FromStr for Address {
type Err = Error;
fn from_str(addr: &str) -> Result<Self, Error> {
if addr.len() > MAX_ADDRESS_LEN || addr.len() < 3 {
return Err(Error::InvalidLength);
}
let network: Network = match &addr[0..1] {
TESTNET_PREFIX => Network::Testnet,
MAINNET_PREFIX => Network::Mainnet,
_ => {
return Err(Error::UnknownNetwork);
}
};
let protocol: Protocol = match &addr[1..2] {
"0" => Protocol::ID,
"1" => Protocol::Secp256k1,
"2" => Protocol::Actor,
"3" => Protocol::BLS,
_ => {
return Err(Error::UnknownProtocol);
}
};
let raw = &addr[2..];
if protocol == Protocol::ID {
if raw.len() > 20 {
return Err(Error::InvalidLength);
}
let id = raw.parse::<u64>()?;
return Ok(Address::new_id(id));
}
let mut payload = ADDRESS_ENCODER.decode(raw.as_bytes())?;
let cksm = payload.split_off(payload.len() - CHECKSUM_HASH_LEN);
if (protocol == Protocol::Secp256k1 || protocol == Protocol::Actor)
&& payload.len() != PAYLOAD_HASH_LEN
{
return Err(Error::InvalidPayload);
}
if protocol == Protocol::BLS && payload.len() != BLS_PUB_LEN {
return Err(Error::InvalidPayload);
}
let mut ingest = payload.clone();
ingest.insert(0, protocol as u8);
if !validate_checksum(&ingest, cksm) {
return Err(Error::InvalidChecksum);
}
Address::new(network, protocol, &payload)
}
}
impl ser::Serialize for Address {
fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error>
where
S: ser::Serializer,
{
let address_bytes = self.to_bytes();
serde_bytes::Serialize::serialize(&address_bytes, s)
}
}
impl<'de> de::Deserialize<'de> for Address {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: de::Deserializer<'de>,
{
let bz: Vec<u8> = serde_bytes::Deserialize::deserialize(deserializer)?;
Address::from_bytes(&bz).map_err(de::Error::custom)
}
}
impl Cbor for Address {}
fn encode(addr: &Address) -> String {
match addr.protocol() {
Protocol::Secp256k1 | Protocol::Actor | Protocol::BLS => {
let ingest = addr.to_bytes();
let mut bz = addr.payload_bytes();
bz.extend(checksum(&ingest));
format!(
"{}{}{}",
addr.network.to_prefix(),
addr.protocol().to_string(),
ADDRESS_ENCODER.encode(bz.as_mut()),
)
}
Protocol::ID => format!(
"{}{}{}",
addr.network.to_prefix(),
addr.protocol().to_string(),
from_leb_bytes(&addr.payload_bytes()).expect("should read encoded bytes"),
),
}
}
pub(crate) fn to_leb_bytes(id: u64) -> Result<Vec<u8>, Error> {
let mut buf = Vec::new();
leb128::write::unsigned(&mut buf, id)?;
Ok(buf)
}
pub(crate) fn from_leb_bytes(bz: &[u8]) -> Result<u64, Error> {
let mut readable = &bz[..];
Ok(leb128::read::unsigned(&mut readable)?)
}
pub fn checksum(ingest: &[u8]) -> Vec<u8> {
blake2b_variable(ingest, CHECKSUM_HASH_LEN)
}
pub fn validate_checksum(ingest: &[u8], expect: Vec<u8>) -> bool {
let digest = checksum(ingest);
digest == expect
}
fn address_hash(ingest: &[u8]) -> [u8; 20] {
let digest = blake2b_variable(ingest, PAYLOAD_HASH_LEN);
let mut hash = [0u8; 20];
hash.clone_from_slice(&digest);
hash
}