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use std::fmt;
use std::str::FromStr;
use std::time::SystemTime;
use bytes::Bytes;
use http::header::HeaderValue;
use httpdate;
use super::IterExt;
/// A timestamp with HTTP formatting and parsing
// Prior to 1995, there were three different formats commonly used by
// servers to communicate timestamps. For compatibility with old
// implementations, all three are defined here. The preferred format is
// a fixed-length and single-zone subset of the date and time
// specification used by the Internet Message Format [RFC5322].
//
// HTTP-date = IMF-fixdate / obs-date
//
// An example of the preferred format is
//
// Sun, 06 Nov 1994 08:49:37 GMT ; IMF-fixdate
//
// Examples of the two obsolete formats are
//
// Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
// Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
//
// A recipient that parses a timestamp value in an HTTP header field
// MUST accept all three HTTP-date formats. When a sender generates a
// header field that contains one or more timestamps defined as
// HTTP-date, the sender MUST generate those timestamps in the
// IMF-fixdate format.
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub(crate) struct HttpDate(httpdate::HttpDate);
impl HttpDate {
pub(crate) fn from_val(val: &HeaderValue) -> Option<Self> {
val.to_str().ok()?.parse().ok()
}
}
// TODO: remove this and FromStr?
#[derive(Debug)]
pub struct Error(());
impl super::TryFromValues for HttpDate {
fn try_from_values<'i, I>(values: &mut I) -> Result<Self, ::Error>
where
I: Iterator<Item = &'i HeaderValue>,
{
values
.just_one()
.and_then(HttpDate::from_val)
.ok_or_else(::Error::invalid)
}
}
impl From<HttpDate> for HeaderValue {
fn from(date: HttpDate) -> HeaderValue {
(&date).into()
}
}
impl<'a> From<&'a HttpDate> for HeaderValue {
fn from(date: &'a HttpDate) -> HeaderValue {
// TODO: could be just BytesMut instead of String
let s = date.to_string();
let bytes = Bytes::from(s);
HeaderValue::from_maybe_shared(bytes).expect("HttpDate always is a valid value")
}
}
impl FromStr for HttpDate {
type Err = Error;
fn from_str(s: &str) -> Result<HttpDate, Error> {
Ok(HttpDate(s.parse().map_err(|_| Error(()))?))
}
}
impl fmt::Debug for HttpDate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&self.0, f)
}
}
impl fmt::Display for HttpDate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&self.0, f)
}
}
impl From<SystemTime> for HttpDate {
fn from(sys: SystemTime) -> HttpDate {
HttpDate(sys.into())
}
}
impl From<HttpDate> for SystemTime {
fn from(date: HttpDate) -> SystemTime {
SystemTime::from(date.0)
}
}
#[cfg(test)]
mod tests {
use super::HttpDate;
use std::time::{Duration, UNIX_EPOCH};
// The old tests had Sunday, but 1994-11-07 is a Monday.
fn nov_07() -> HttpDate {
HttpDate((UNIX_EPOCH + Duration::new(784198117, 0)).into())
}
#[test]
fn test_display_is_imf_fixdate() {
assert_eq!("Mon, 07 Nov 1994 08:48:37 GMT", &nov_07().to_string());
}
#[test]
fn test_imf_fixdate() {
assert_eq!(
"Mon, 07 Nov 1994 08:48:37 GMT".parse::<HttpDate>().unwrap(),
nov_07()
);
}
#[test]
fn test_rfc_850() {
assert_eq!(
"Monday, 07-Nov-94 08:48:37 GMT"
.parse::<HttpDate>()
.unwrap(),
nov_07()
);
}
#[test]
fn test_asctime() {
assert_eq!(
"Mon Nov 7 08:48:37 1994".parse::<HttpDate>().unwrap(),
nov_07()
);
}
#[test]
fn test_no_date() {
assert!("this-is-no-date".parse::<HttpDate>().is_err());
}
}