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use std::fmt;
#[cfg(feature = "chrono")]
use chrono::{DateTime, Utc};
use derive_more::{Display, Error};
use crate::utils::Base64DebugFmtHelper;
#[cfg(feature = "chrono")]
use crate::utils::tin_for_timestamp;
#[derive(Default, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Hash)]
pub struct Rpi {
bytes: [u8; 16],
}
impl fmt::Debug for Rpi {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("Rpi")
.field(&Base64DebugFmtHelper(self))
.finish()
}
}
impl Rpi {
#[cfg(feature = "chrono")]
pub fn for_timestamp(tk: &crate::tkey::TracingKey, timestamp: &DateTime<Utc>) -> Rpi {
let dtkey = crate::dtkey::DailyTracingKey::for_timestamp(tk, timestamp);
dtkey.get_rpi_for_tin(tin_for_timestamp(timestamp)).unwrap()
}
#[cfg(feature = "chrono")]
pub fn for_now(tk: &crate::tkey::TracingKey) -> Rpi {
Rpi::for_timestamp(tk, &Utc::now())
}
pub fn from_bytes(b: &[u8]) -> Result<Rpi, InvalidRpi> {
if b.len() != 16 {
return Err(InvalidRpi);
}
let mut bytes = [0u8; 16];
bytes.copy_from_slice(b);
Ok(Rpi { bytes })
}
pub fn as_bytes(&self) -> &[u8] {
&self.bytes
}
}
#[derive(Error, Display, Debug)]
#[display(fmt = "invalid rpi")]
pub struct InvalidRpi;
#[cfg(feature = "base64")]
mod base64_impl {
use super::*;
use std::{fmt, str};
impl str::FromStr for Rpi {
type Err = InvalidRpi;
fn from_str(value: &str) -> Result<Rpi, InvalidRpi> {
let mut bytes = [0u8; 16];
if value.len() != 22 {
return Err(InvalidRpi);
}
base64_::decode_config_slice(value, base64_::URL_SAFE_NO_PAD, &mut bytes[..])
.map_err(|_| InvalidRpi)?;
Ok(Rpi { bytes })
}
}
impl fmt::Display for Rpi {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut buf = [0u8; 50];
let len = base64_::encode_config_slice(self.bytes, base64_::URL_SAFE_NO_PAD, &mut buf);
f.write_str(unsafe { std::str::from_utf8_unchecked(&buf[..len]) })
}
}
}
#[cfg(feature = "serde")]
mod serde_impl {
pub use super::*;
use serde_::de::Deserializer;
use serde_::ser::Serializer;
use serde_::{Deserialize, Serialize};
impl Serialize for Rpi {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
if serializer.is_human_readable() {
serializer.serialize_str(&self.to_string())
} else {
serializer.serialize_bytes(self.as_bytes())
}
}
}
impl<'de> Deserialize<'de> for Rpi {
fn deserialize<D>(deserializer: D) -> Result<Rpi, D::Error>
where
D: Deserializer<'de>,
{
use serde_::de::Error;
if deserializer.is_human_readable() {
let s = String::deserialize(deserializer).map_err(D::Error::custom)?;
s.parse().map_err(D::Error::custom)
} else {
let buf = Vec::<u8>::deserialize(deserializer).map_err(D::Error::custom)?;
Rpi::from_bytes(&buf).map_err(D::Error::custom)
}
}
}
}