97 lines
2.3 KiB
Rust
97 lines
2.3 KiB
Rust
use {
|
|
arrayvec::ArrayString,
|
|
rand::{RngExt, rng},
|
|
serde::{Deserialize, Deserializer, Serialize, Serializer, de},
|
|
std::{
|
|
fmt::{Debug, Display, Formatter},
|
|
num::ParseIntError,
|
|
str::FromStr,
|
|
},
|
|
thiserror::Error,
|
|
};
|
|
|
|
#[derive(Copy, Clone, Eq, PartialEq, Hash)]
|
|
pub struct Opaque {
|
|
lo: u64,
|
|
hi: u64,
|
|
}
|
|
|
|
pub fn opaque() -> Opaque {
|
|
let mut rng = rng();
|
|
Opaque {
|
|
lo: rng.random(),
|
|
hi: rng.random(),
|
|
}
|
|
}
|
|
|
|
impl Opaque {
|
|
pub fn to_string(self) -> ArrayString<OPAQUE_LEN> {
|
|
use std::fmt::Write;
|
|
let mut s = ArrayString::new();
|
|
write!(s, "{}", self).unwrap();
|
|
s
|
|
}
|
|
}
|
|
|
|
impl Display for Opaque {
|
|
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
|
|
write!(f, "{:016x}", self.hi)?;
|
|
write!(f, "{:016x}", self.lo)?;
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl Debug for Opaque {
|
|
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
|
|
Display::fmt(self, f)
|
|
}
|
|
}
|
|
|
|
impl Serialize for Opaque {
|
|
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
|
|
where
|
|
S: Serializer,
|
|
{
|
|
let s = self.to_string();
|
|
serializer.serialize_str(&s)
|
|
}
|
|
}
|
|
|
|
impl<'de> Deserialize<'de> for Opaque {
|
|
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
|
|
where
|
|
D: Deserializer<'de>,
|
|
{
|
|
let s = <&str>::deserialize(deserializer)?;
|
|
Opaque::from_str(s).map_err(de::Error::custom)
|
|
}
|
|
}
|
|
|
|
impl FromStr for Opaque {
|
|
type Err = OpaqueError;
|
|
|
|
fn from_str(s: &str) -> Result<Self, Self::Err> {
|
|
if s.len() != OPAQUE_LEN {
|
|
return Err(OpaqueError::InvalidLength);
|
|
}
|
|
if !s.is_char_boundary(OPAQUE_LEN / 2) {
|
|
return Err(OpaqueError::NotAscii);
|
|
}
|
|
let (hi, lo) = s.split_at(OPAQUE_LEN / 2);
|
|
let hi = u64::from_str_radix(hi, 16).map_err(OpaqueError::Parse)?;
|
|
let lo = u64::from_str_radix(lo, 16).map_err(OpaqueError::Parse)?;
|
|
Ok(Self { lo, hi })
|
|
}
|
|
}
|
|
|
|
pub const OPAQUE_LEN: usize = 32;
|
|
|
|
#[derive(Debug, Error)]
|
|
pub enum OpaqueError {
|
|
#[error("The string is not exactly 32 bytes long")]
|
|
InvalidLength,
|
|
#[error("The string is not ascii")]
|
|
NotAscii,
|
|
#[error("Could not parse the string as a hex number")]
|
|
Parse(ParseIntError),
|
|
}
|