86 lines
2.7 KiB
Rust
86 lines
2.7 KiB
Rust
//! Utility functions for Header implementations.
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extern crate time;
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use std::str;
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use std::fmt;
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/// Reads a single raw string when parsing a header
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pub fn from_one_raw_str<T: str::FromStr>(raw: &[Vec<u8>]) -> Option<T> {
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if raw.len() != 1 {
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return None;
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}
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// we JUST checked that raw.len() == 1, so raw[0] WILL exist.
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match str::from_utf8(&raw[0][]) {
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Ok(s) => str::FromStr::from_str(s),
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Err(_) => None
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}
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}
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/// Reads a comma-delimited raw header into a Vec.
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#[inline]
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pub fn from_comma_delimited<T: str::FromStr>(raw: &[Vec<u8>]) -> Option<Vec<T>> {
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if raw.len() != 1 {
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return None;
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}
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// we JUST checked that raw.len() == 1, so raw[0] WILL exist.
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from_one_comma_delimited(&raw[0][])
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}
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/// Reads a comma-delimited raw string into a Vec.
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pub fn from_one_comma_delimited<T: str::FromStr>(raw: &[u8]) -> Option<Vec<T>> {
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match str::from_utf8(raw) {
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Ok(s) => {
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Some(s.as_slice()
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.split(',')
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.map(|x| x.trim())
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.filter_map(str::FromStr::from_str)
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.collect())
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}
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Err(_) => None
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}
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}
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/// Format an array into a comma-delimited string.
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pub fn fmt_comma_delimited<T: fmt::Display>(fmt: &mut fmt::Formatter, parts: &[T]) -> fmt::Result {
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let last = parts.len() - 1;
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for (i, part) in parts.iter().enumerate() {
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try!(write!(fmt, "{}", part));
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if i < last {
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try!(write!(fmt, ", "));
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}
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}
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Ok(())
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}
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/// Get a Tm from HTTP date formats.
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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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pub fn tm_from_str(s: &str) -> Option<time::Tm> {
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time::strptime(s, "%a, %d %b %Y %T %Z").or_else(|_| {
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time::strptime(s, "%A, %d-%b-%y %T %Z")
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}).or_else(|_| {
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time::strptime(s, "%c")
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}).ok()
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}
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