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//! Binary types, hashes, signatures, etc used by kitsune.
use kitsune_p2p_dht_arc::DhtLocation;
/// Kitsune hashes are expected to be 36 bytes.
/// The first 32 bytes are the proper hash.
/// The final 4 bytes are a hash-of-the-hash that can be treated like a u32 "location".
pub trait KitsuneBinType:
'static
+ Send
+ Sync
+ std::fmt::Debug
+ Clone
+ std::hash::Hash
+ PartialEq
+ Eq
+ PartialOrd
+ Ord
+ std::convert::Into<Vec<u8>>
{
/// Create an instance, ensuring the proper number of bytes were provided.
fn new(bytes: Vec<u8>) -> Self;
/// Fetch just the core 32 bytes (without the 4 location bytes).
fn get_bytes(&self) -> &[u8];
/// Fetch the dht "loc" / location for this hash.
fn get_loc(&self) -> DhtLocation;
}
/// internal convert 4 location bytes into a u32 location
fn bytes_to_loc(bytes: &[u8]) -> u32 {
(bytes[0] as u32)
+ ((bytes[1] as u32) << 8)
+ ((bytes[2] as u32) << 16)
+ ((bytes[3] as u32) << 24)
}
macro_rules! make_kitsune_bin_type {
($($doc:expr, $name:ident),*,) => {
$(
#[doc = $doc]
#[derive(
Clone,
PartialEq,
Eq,
Hash,
PartialOrd,
Ord,
shrinkwraprs::Shrinkwrap,
derive_more::Into,
serde::Serialize,
serde::Deserialize,
)]
#[shrinkwrap(mutable)]
pub struct $name(#[serde(with = "serde_bytes")] pub Vec<u8>);
impl KitsuneBinType for $name {
fn new(mut bytes: Vec<u8>) -> Self {
if bytes.len() != 36 {
// If location bytes are not included, append them now.
debug_assert_eq!(bytes.len(), 32);
// FIXME: no way to compute location bytes at this time,
// so simply pad with 0's for now
bytes.append(&mut [0; 4].to_vec());
// todo!("actually calculate location bytes");
// bytes.append(&mut kitsune_location_bytes(&bytes));
}
debug_assert_eq!(bytes.len(), 36);
Self(bytes)
}
fn get_bytes(&self) -> &[u8] {
&self.0[..self.0.len() - 4]
}
fn get_loc(&self) -> DhtLocation {
DhtLocation::new(bytes_to_loc(&self.0[self.0.len() - 4..]))
}
}
impl std::fmt::Debug for $name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_fmt(format_args!("{}(0x", stringify!($name)))?;
for byte in &self.0 {
f.write_fmt(format_args!("{:02x}", byte))?;
}
f.write_fmt(format_args!(")"))?;
Ok(())
}
}
impl std::fmt::Display for $name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
base64::encode_config(&self.0, base64::URL_SAFE_NO_PAD).fmt(f)
}
}
impl AsRef<[u8]> for $name {
fn as_ref(&self) -> &[u8] {
self.0.as_slice()
}
}
#[cfg(feature = "arbitrary")]
impl<'a> arbitrary::Arbitrary<'a> for $name {
fn arbitrary(u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {
// FIXME: there is no way to calculate location bytes right now,
// so we're producing arbitrary bytes in a way that the location
// DOES NOT match the hash. This needs to change, but we can go
// forward with this for now.
let mut buf = [0; 36];
buf[..]
.copy_from_slice(u.bytes(36)?);
Ok(Self::new(buf.to_vec()))
}
}
)*
};
}
make_kitsune_bin_type! {
"Distinguish multiple categories of communication within the same network module.",
KitsuneSpace,
"Distinguish multiple agents within the same network module.",
KitsuneAgent,
"The basis hash/coordinate when identifying a neighborhood.",
KitsuneBasis,
r#"Top-level "KitsuneDataHash" items are buckets of related meta-data.
These metadata "Operations" each also have unique OpHashes."#,
KitsuneOpHash,
}
/// The op data with its location
#[derive(Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
#[repr(transparent)]
#[serde(transparent)]
pub struct KitsuneOpData(
/// The op bytes
#[serde(with = "serde_bytes")]
pub Vec<u8>,
);
impl KitsuneOpData {
/// Constructor
pub fn new(op: Vec<u8>) -> KOp {
KOp::new(Self(op))
}
/// Size in bytes of this Op
pub fn size(&self) -> usize {
self.0.len()
}
}
/// Convenience type
pub type KOp = std::sync::Arc<KitsuneOpData>;
/// A cryptographic signature.
#[derive(
Clone,
PartialEq,
Eq,
Hash,
PartialOrd,
Ord,
shrinkwraprs::Shrinkwrap,
derive_more::From,
derive_more::Into,
serde::Deserialize,
serde::Serialize,
)]
#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
#[shrinkwrap(mutable)]
pub struct KitsuneSignature(#[serde(with = "serde_bytes")] pub Vec<u8>);
impl std::fmt::Debug for KitsuneSignature {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.write_fmt(format_args!("Signature(0x"))?;
for byte in &self.0 {
f.write_fmt(format_args!("{:02x}", byte))?;
}
f.write_fmt(format_args!(")"))?;
Ok(())
}
}