add vary header, first draft

src/header/common/mod.rs

@@ -24,6 +24,7 @@ pub use self::location::Location;
 pub use self::transfer_encoding::TransferEncoding;
 pub use self::upgrade::Upgrade;
 pub use self::user_agent::UserAgent;
+pub use self::vary::Vary;
 pub use self::server::Server;
 pub use self::set_cookie::SetCookie;
 
@@ -132,4 +133,7 @@ pub mod upgrade;
 /// Exposes the UserAgent header.
 pub mod user_agent;
 
+/// Exposes the Vary header.
+pub mod vary;
+
 pub mod util;

src/header/common/vary.rs

@@ -0,0 +1,59 @@
+use header::{Header, HeaderFormat, CaseInsensitive};
+use std::fmt::{mod};
+use super::util::{from_comma_delimited, fmt_comma_delimited, from_one_raw_str};
+
+/// The `Allow` header.
+/// See also https://tools.ietf.org/html/rfc7231#section-7.1.4
+
+#[deriving(Clone, PartialEq, Show)]
+pub enum Vary {
+    /// This corresponds to '*'.
+    Any,
+    /// The header field names which will influence the response representation.
+    Headers(Vec<CaseInsensitive>),
+}
+
+impl Header for Vary {
+    fn header_name(_: Option<Vary>) -> &'static str {
+        "Vary"
+    }
+
+    fn parse_header(raw: &[Vec<u8>]) -> Option<Vary> {
+        from_one_raw_str(raw).and_then(|s: String| {
+            let slice = s[];
+            match slice {
+                "" => None,
+                "*" => Some(Vary::Any),
+                _ => from_comma_delimited(raw).map(|vec| Vary::Headers(vec)),
+            }
+        })
+    }
+}
+
+impl HeaderFormat for Vary {
+    fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Vary::Any => { write!(fmt, "*") }
+            Vary::Headers(ref fields) => { fmt_comma_delimited(fmt, fields[]) }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Vary;
+    use header::{Header, CaseInsensitive};
+
+    #[test]
+    fn test_vary() {
+        let mut vary: Option<Vary>;
+
+        vary = Header::parse_header([b"*".to_vec()].as_slice());
+        assert_eq!(vary, Some(Vary::Any));
+
+        vary = Header::parse_header([b"etag,cookie,allow".to_vec()].as_slice());
+        assert_eq!(vary, Some(Vary::Headers(vec![from_str::<CaseInsensitive>("eTag").unwrap(),
+                                                 from_str::<CaseInsensitive>("cookIE").unwrap(),
+                                                 from_str::<CaseInsensitive>("AlLOw").unwrap(),])));
+    }
+}

src/header/mod.rs

@@ -10,7 +10,7 @@ use std::borrow::Cow::{Borrowed, Owned};
 use std::fmt::{mod, Show};
 use std::intrinsics::TypeId;
 use std::raw::TraitObject;
-use std::str::SendStr;
+use std::str::{SendStr, FromStr};
 use std::collections::HashMap;
 use std::collections::hash_map::{Entries, Occupied, Vacant};
 use std::{hash, mem};
@@ -446,8 +446,15 @@ impl fmt::Show for Box<HeaderFormat + Send + Sync> {
     }
 }
 
+/// Case-insensitive string.
 //#[deriving(Clone)]
-struct CaseInsensitive(SendStr);
+pub struct CaseInsensitive(SendStr);
+
+impl FromStr for CaseInsensitive {
+    fn from_str(s: &str) -> Option<CaseInsensitive> {
+        Some(CaseInsensitive(Owned(s.to_string())))
+    }
+}
 
 impl Clone for CaseInsensitive {
     fn clone(&self) -> CaseInsensitive {