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()] })

src/header/common/mod.rs

@@ -7,6 +7,7 @@
 //! is used, such as `ContentType(pub Mime)`.
 
 pub use self::accept::Accept;
+pub use self::allow::Allow;
 pub use self::authorization::Authorization;
 pub use self::cache_control::CacheControl;
 pub use self::cookie::Cookies;
@@ -74,6 +75,9 @@ macro_rules! deref(
 /// Exposes the Accept header.
 pub mod accept;
 
+/// Exposes the Allow header.
+pub mod allow;
+
 /// Exposes the Authorization header.
 pub mod authorization;
 

src/method.rs

@@ -69,18 +69,22 @@ impl Method {
 
 impl FromStr for Method {
     fn from_str(s: &str) -> Option<Method> {
-        Some(match s {
-            "OPTIONS" => Options,
-            "GET" => Get,
-            "POST" => Post,
-            "PUT" => Put,
-            "DELETE" => Delete,
-            "HEAD" => Head,
-            "TRACE" => Trace,
-            "CONNECT" => Connect,
-            "PATCH" => Patch,
-            _ => Extension(s.to_string())
-        })
+        if s == "" {
+            None
+        } else {
+            Some(match s {
+                "OPTIONS" => Options,
+                "GET" => Get,
+                "POST" => Post,
+                "PUT" => Put,
+                "DELETE" => Delete,
+                "HEAD" => Head,
+                "TRACE" => Trace,
+                "CONNECT" => Connect,
+                "PATCH" => Patch,
+                _ => Extension(s.to_string())
+            })
+        }
     }
 }