66d54d03e7
src/header/parsing.rs now uses unsafe get_unchecked() again, I don't know why it was removed.
63 lines
2.0 KiB
Rust
63 lines
2.0 KiB
Rust
use std::fmt;
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use std::ascii::AsciiExt;
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use header::{Header, HeaderFormat, parsing};
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/// The `Pragma` header defined by HTTP/1.0.
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///
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/// > The "Pragma" header field allows backwards compatibility with
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/// > HTTP/1.0 caches, so that clients can specify a "no-cache" request
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/// > that they will understand (as Cache-Control was not defined until
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/// > HTTP/1.1). When the Cache-Control header field is also present and
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/// > understood in a request, Pragma is ignored.
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/// > In HTTP/1.0, Pragma was defined as an extensible field for
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/// > implementation-specified directives for recipients. This
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/// > specification deprecates such extensions to improve interoperability.
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///
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/// Spec: https://tools.ietf.org/html/rfc7234#section-5.4
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#[derive(Clone, PartialEq, Debug)]
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pub enum Pragma {
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/// Corresponds to the `no-cache` value.
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NoCache,
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/// Every value other than `no-cache`.
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Ext(String),
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}
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impl Header for Pragma {
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fn header_name() -> &'static str {
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"Pragma"
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}
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fn parse_header(raw: &[Vec<u8>]) -> Option<Pragma> {
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parsing::from_one_raw_str(raw).and_then(|s: String| {
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let slice = &s.to_ascii_lowercase()[..];
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match slice {
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"no-cache" => Some(Pragma::NoCache),
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_ => Some(Pragma::Ext(s)),
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}
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})
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}
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}
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impl HeaderFormat for Pragma {
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fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.write_str(match *self {
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Pragma::NoCache => "no-cache",
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Pragma::Ext(ref string) => &string[..],
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})
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}
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}
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#[test]
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fn test_parse_header() {
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let a: Pragma = Header::parse_header([b"no-cache".to_vec()].as_ref()).unwrap();
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let b = Pragma::NoCache;
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assert_eq!(a, b);
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let c: Pragma = Header::parse_header([b"FoObar".to_vec()].as_ref()).unwrap();
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let d = Pragma::Ext("FoObar".to_string());
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assert_eq!(c, d);
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let e: Option<Pragma> = Header::parse_header([b"".to_vec()].as_ref());
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assert_eq!(e, None);
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}
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