69 lines
2.2 KiB
Rust
69 lines
2.2 KiB
Rust
use header::{Header, HeaderFormat};
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use std::fmt::{mod, Show};
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use super::util::from_one_raw_str;
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use std::from_str::FromStr;
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use time::{Tm, strptime};
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// Egh, replace as soon as something better than time::Tm exists.
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/// The `Date` header field.
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#[deriving(PartialEq, Clone)]
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pub struct Date(pub Tm);
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impl Header for Date {
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fn header_name(_: Option<Date>) -> &'static str {
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"Date"
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}
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fn parse_header(raw: &[Vec<u8>]) -> Option<Date> {
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from_one_raw_str(raw)
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}
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}
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impl HeaderFormat for Date {
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fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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self.fmt(fmt)
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}
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}
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impl fmt::Show for Date {
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fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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let Date(ref tm) = *self;
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// bummer that tm.strftime allocates a string. It would nice if it
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// returned a Show instead, since I don't need the String here
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write!(fmt, "{}", tm.to_utc().rfc822())
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}
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}
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impl FromStr for Date {
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// Prior to 1995, there were three different formats commonly used by
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// servers to communicate timestamps. For compatibility with old
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// implementations, all three are defined here. The preferred format is
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// a fixed-length and single-zone subset of the date and time
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// specification used by the Internet Message Format [RFC5322].
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//
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// HTTP-date = IMF-fixdate / obs-date
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//
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// An example of the preferred format is
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//
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// Sun, 06 Nov 1994 08:49:37 GMT ; IMF-fixdate
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//
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// Examples of the two obsolete formats are
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//
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// Sunday, 06-Nov-94 08:49:37 GMT ; obsolete RFC 850 format
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// Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
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//
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// A recipient that parses a timestamp value in an HTTP header field
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// MUST accept all three HTTP-date formats. When a sender generates a
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// header field that contains one or more timestamps defined as
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// HTTP-date, the sender MUST generate those timestamps in the
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// IMF-fixdate format.
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fn from_str(s: &str) -> Option<Date> {
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strptime(s, "%a, %d %b %Y %T %Z").or_else(|_| {
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strptime(s, "%A, %d-%b-%y %T %Z")
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}).or_else(|_| {
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strptime(s, "%c")
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}).ok().map(|tm| Date(tm))
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}
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}
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