add allow header

src/header/common/allow.rs

@@ -0,0 +1,48 @@
+use header::{Header, HeaderFormat};
+use method::Method;
+use std::fmt::{mod};
+use super::util::{from_comma_delimited, fmt_comma_delimited};
+
+/// The `Allow` header.
+/// See also https://tools.ietf.org/html/rfc7231#section-7.4.1
+
+#[deriving(Clone, PartialEq, Show)]
+pub struct Allow(pub Vec<Method>);
+
+deref!(Allow -> Vec<Method>)
+
+impl Header for Allow {
+    fn header_name(_: Option<Allow>) -> &'static str {
+        "Allow"
+    }
+
+    fn parse_header(raw: &[Vec<u8>]) -> Option<Allow> {
+        from_comma_delimited(raw).map(|vec| Allow(vec))
+    }
+}
+
+impl HeaderFormat for Allow {
+    fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt_comma_delimited(fmt, self[])
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Allow;
+    use header::Header;
+    use method::Method::{mod, Options, Get, Put, Post, Delete, Head, Trace, Connect, Patch, Extension};
+
+    #[test]
+    fn test_allow() {
+        let mut allow: Option<Allow>;
+
+        allow = Header::parse_header([b"OPTIONS,GET,PUT,POST,DELETE,HEAD,TRACE,CONNECT,PATCH,fOObAr".to_vec()].as_slice());
+        assert_eq!(allow, Some(Allow(vec![Options, Get, Put, Post, Delete, Head, Trace, Connect, Patch, Extension("fOObAr".to_string())])));
+
+        allow = Header::parse_header([b"".to_vec()].as_slice());
+        assert_eq!(allow, Some(Allow(Vec::<Method>::new())));
+    }
+}
+
+bench_header!(bench, Allow, { vec![b"OPTIONS,GET,PUT,POST,DELETE,HEAD,TRACE,CONNECT,PATCH,fOObAr".to_vec()] })