195a89fa91
Header::parse_header() returns now a hyper Result instead of an option this will enable more precise Error messages in the future, currently most failures are reported as ::Error::Header. BREAKING CHANGE: parse_header returns Result instead of Option, related code did also change
56 lines
1.6 KiB
Rust
56 lines
1.6 KiB
Rust
use std::fmt;
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use std::str;
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use unicase::UniCase;
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use header::{Header, HeaderFormat};
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/// The `Expect` header.
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///
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/// > The "Expect" header field in a request indicates a certain set of
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/// > behaviors (expectations) that need to be supported by the server in
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/// > order to properly handle this request. The only such expectation
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/// > defined by this specification is 100-continue.
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/// >
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/// > Expect = "100-continue"
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#[derive(Copy, Clone, PartialEq, Debug)]
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pub enum Expect {
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/// The value `100-continue`.
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Continue
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}
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const EXPECT_CONTINUE: UniCase<&'static str> = UniCase("100-continue");
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impl Header for Expect {
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fn header_name() -> &'static str {
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"Expect"
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}
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fn parse_header(raw: &[Vec<u8>]) -> ::Result<Expect> {
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if raw.len() == 1 {
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let text = unsafe {
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// safe because:
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// 1. we just checked raw.len == 1
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// 2. we don't actually care if it's utf8, we just want to
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// compare the bytes with the "case" normalized. If it's not
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// utf8, then the byte comparison will fail, and we'll return
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// None. No big deal.
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str::from_utf8_unchecked(raw.get_unchecked(0))
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};
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if UniCase(text) == EXPECT_CONTINUE {
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Ok(Expect::Continue)
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} else {
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Err(::Error::Header)
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}
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} else {
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Err(::Error::Header)
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}
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}
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}
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impl HeaderFormat for Expect {
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fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.write_str("100-continue")
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}
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}
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