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use serde::{de, Deserialize};
use std::fmt;
use std::ops::Deref;
use time::format_description::FormatItem;
use time::macros::format_description;
use time::{OffsetDateTime, PrimitiveDateTime};
const MW_TIMESTAMP: &[FormatItem] =
format_description!("[year]-[month]-[day]T[hour]:[minute]:[second]Z");
#[derive(Debug, Copy, Clone, Eq, PartialEq, Deserialize)]
#[repr(transparent)]
#[serde(try_from = "String")]
pub struct Timestamp(OffsetDateTime);
impl Deref for Timestamp {
type Target = OffsetDateTime;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl TryFrom<String> for Timestamp {
type Error = String;
fn try_from(value: String) -> Result<Self, Self::Error> {
match PrimitiveDateTime::parse(&value, &MW_TIMESTAMP) {
Ok(dt) => Ok(Self(dt.assume_utc())),
Err(err) => Err(format!("Unable to parse timestamp: {}", err)),
}
}
}
impl fmt::Display for Timestamp {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.0.format(&MW_TIMESTAMP).unwrap())
}
}
#[derive(Debug, Copy, Clone, Eq, PartialEq, Deserialize)]
#[serde(try_from = "String")]
pub enum Expiry {
Infinity,
Finite(Timestamp),
}
impl Expiry {
pub fn is_infinity(&self) -> bool {
matches!(self, Self::Infinity)
}
pub fn as_timestamp(&self) -> Option<&Timestamp> {
match self {
Expiry::Infinity => None,
Expiry::Finite(datetime) => Some(datetime),
}
}
}
impl TryFrom<String> for Expiry {
type Error = String;
fn try_from(value: String) -> Result<Self, Self::Error> {
if value == "infinity" {
return Ok(Self::Infinity);
}
Timestamp::try_from(value).map(Self::Finite)
}
}
impl fmt::Display for Expiry {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Expiry::Infinity => {
write!(f, "infinity")
}
Expiry::Finite(ts) => {
write!(f, "{}", ts)
}
}
}
}
#[doc(hidden)]
pub fn deserialize_notificationtimestamp<'de, D>(
deserializer: D,
) -> Result<Option<Timestamp>, D::Error>
where
D: de::Deserializer<'de>,
{
let val = String::deserialize(deserializer)?;
if val.is_empty() {
return Ok(None);
}
match Timestamp::try_from(val) {
Ok(ts) => Ok(Some(ts)),
Err(err) => Err(de::Error::custom(err)),
}
}
#[cfg(test)]
mod tests {
use super::*;
use time::macros::{date, time};
#[test]
fn test_expiry_timestamp() {
let infinity = Expiry::try_from("infinity".to_string()).unwrap();
assert!(infinity.is_infinity());
assert_eq!(&infinity.to_string(), "infinity");
let expiry =
Expiry::try_from("2001-01-15T14:56:00Z".to_string()).unwrap();
let timestamp = expiry.as_timestamp().unwrap();
assert_eq!(timestamp.date(), date!(2001 - 01 - 15));
assert_eq!(timestamp.time(), time!(14:56:00));
assert_eq!(×tamp.to_string(), "2001-01-15T14:56:00Z");
}
}