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use crate::error::TryFromError;
#[cfg(feature = "b64")]
use crate::error::DecodeError;
use std::fmt;
use std::convert::{TryFrom, TryInto};
use rand::rngs::OsRng;
use rand::RngCore;
#[derive(Clone, PartialEq, Eq, Hash)]
pub struct Token<const S: usize> {
bytes: [u8; S]
}
impl<const S: usize> Token<S> {
pub const LEN: usize = S;
pub const STR_LEN: usize = crate::calculate_b64_len(S);
pub fn new() -> Self {
let mut bytes = [0u8; S];
OsRng.fill_bytes(&mut bytes);
Self { bytes }
}
pub fn from_slice(slice: &[u8]) -> Self {
slice.try_into().unwrap()
}
pub fn to_bytes(&self) -> [u8; S] {
self.bytes
}
}
#[cfg(not(feature = "b64"))]
impl<const S: usize> fmt::Debug for Token<S> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("Token")
.field(&self.as_ref())
.finish()
}
}
#[cfg(feature = "b64")]
impl<const S: usize> fmt::Debug for Token<S> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("Token")
.field(&self.to_string())
.finish()
}
}
#[cfg(feature = "b64")]
impl<const S: usize> fmt::Display for Token<S> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
base64::display::Base64Display::with_config(
self.as_ref(),
base64::URL_SAFE_NO_PAD
).fmt(f)
}
}
impl<const S: usize> From<[u8; S]> for Token<S> {
fn from(bytes: [u8; S]) -> Self {
Self { bytes }
}
}
impl<const S: usize> TryFrom<&[u8]> for Token<S> {
type Error = TryFromError;
fn try_from(v: &[u8]) -> Result<Self, Self::Error> {
<[u8; S]>::try_from(v)
.map_err(TryFromError::from_any)
.map(Self::from)
}
}
#[cfg(feature = "b64")]
impl<const S: usize> crate::FromStr for Token<S> {
type Err = DecodeError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if s.len() != crate::calculate_b64_len(S) {
return Err(DecodeError::InvalidLength)
}
let mut bytes = [0u8; S];
base64::decode_config_slice(s, base64::URL_SAFE_NO_PAD, &mut bytes)
.map_err(DecodeError::inv_bytes)
.map(|_| Self::from(bytes))
}
}
impl<const S: usize> AsRef<[u8]> for Token<S> {
fn as_ref(&self) -> &[u8] {
&self.bytes
}
}
#[cfg(all(feature = "b64", feature = "serde"))]
mod impl_serde {
use super::*;
use std::borrow::Cow;
use std::str::FromStr;
use _serde::{Serialize, Serializer, Deserialize, Deserializer};
use _serde::de::Error;
impl<const SI: usize> Serialize for Token<SI> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer {
serializer.collect_str(&self)
}
}
impl<'de, const S: usize> Deserialize<'de> for Token<S> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de> {
let s: Cow<'_, str> = Deserialize::deserialize(deserializer)?;
Self::from_str(s.as_ref())
.map_err(D::Error::custom)
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[cfg(feature = "b64")]
use std::str::FromStr;
#[cfg(feature = "b64")]
pub fn b64<const S: usize>() {
let tok = Token::<S>::new();
let b64 = tok.to_string();
let tok_2 = Token::<S>::from_str(&b64).unwrap();
assert_eq!(b64, tok_2.to_string());
}
#[cfg(feature = "b64")]
#[test]
pub fn test_b64() {
b64::<1>();
b64::<2>();
b64::<3>();
b64::<13>();
b64::<24>();
b64::<200>();
b64::<213>();
}
}