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use std::fmt::{self, Display};
use std::io::Write;
use std::str::FromStr;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use bytes::{buf::BufMutExt, BytesMut};
use http::header::{HeaderValue, InvalidHeaderValue};
use crate::error::ParseError;
use crate::header::IntoHeaderValue;
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct HttpDate(time::Tm);
impl FromStr for HttpDate {
type Err = ParseError;
fn from_str(s: &str) -> Result<HttpDate, ParseError> {
match time::strptime(s, "%a, %d %b %Y %T %Z")
.or_else(|_| time::strptime(s, "%A, %d-%b-%y %T %Z"))
.or_else(|_| time::strptime(s, "%c"))
{
Ok(t) => Ok(HttpDate(t)),
Err(_) => Err(ParseError::Header),
}
}
}
impl Display for HttpDate {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(&self.0.to_utc().rfc822(), f)
}
}
impl From<time::Tm> for HttpDate {
fn from(tm: time::Tm) -> HttpDate {
HttpDate(tm)
}
}
impl From<SystemTime> for HttpDate {
fn from(sys: SystemTime) -> HttpDate {
let tmspec = match sys.duration_since(UNIX_EPOCH) {
Ok(dur) => {
time::Timespec::new(dur.as_secs() as i64, dur.subsec_nanos() as i32)
}
Err(err) => {
let neg = err.duration();
time::Timespec::new(
-(neg.as_secs() as i64),
-(neg.subsec_nanos() as i32),
)
}
};
HttpDate(time::at_utc(tmspec))
}
}
impl IntoHeaderValue for HttpDate {
type Error = InvalidHeaderValue;
fn try_into(self) -> Result<HeaderValue, Self::Error> {
let mut wrt = BytesMut::with_capacity(29).writer();
write!(wrt, "{}", self.0.rfc822()).unwrap();
HeaderValue::from_maybe_shared(wrt.get_mut().split().freeze())
}
}
impl From<HttpDate> for SystemTime {
fn from(date: HttpDate) -> SystemTime {
let spec = date.0.to_timespec();
if spec.sec >= 0 {
UNIX_EPOCH + Duration::new(spec.sec as u64, spec.nsec as u32)
} else {
UNIX_EPOCH - Duration::new(spec.sec as u64, spec.nsec as u32)
}
}
}
#[cfg(test)]
mod tests {
use super::HttpDate;
use time::Tm;
const NOV_07: HttpDate = HttpDate(Tm {
tm_nsec: 0,
tm_sec: 37,
tm_min: 48,
tm_hour: 8,
tm_mday: 7,
tm_mon: 10,
tm_year: 94,
tm_wday: 0,
tm_isdst: 0,
tm_yday: 0,
tm_utcoff: 0,
});
#[test]
fn test_date() {
assert_eq!(
"Sun, 07 Nov 1994 08:48:37 GMT".parse::<HttpDate>().unwrap(),
NOV_07
);
assert_eq!(
"Sunday, 07-Nov-94 08:48:37 GMT"
.parse::<HttpDate>()
.unwrap(),
NOV_07
);
assert_eq!(
"Sun Nov 7 08:48:37 1994".parse::<HttpDate>().unwrap(),
NOV_07
);
assert!("this-is-no-date".parse::<HttpDate>().is_err());
}
}