feat(headers): add origin header

Add an Origin header so users may properly send CORS requests

Closes #651

Author: puhrez

src/header/common/host.rs

@@ -1,6 +1,8 @@
 use header::{Header};
 use std::fmt;
+use std::str::FromStr;
 use header::parsing::from_one_raw_str;
+use url::idna::domain_to_unicode;
 
 /// The `Host` header.
 ///
@@ -48,38 +50,7 @@ impl Header for Host {
     }
 
     fn parse_header(raw: &[Vec<u8>]) -> ::Result<Host> {
-        from_one_raw_str(raw).and_then(|mut s: String| {
-            // FIXME: use rust-url to parse this
-            // https://github.com/servo/rust-url/issues/42
-            let idx = {
-                let slice = &s[..];
-                if slice.starts_with('[') {
-                    match slice.rfind(']') {
-                        Some(idx) => {
-                            if slice.len() > idx + 2 {
-                                Some(idx + 1)
-                            } else {
-                                None
-                            }
-                        }
-                        None => return Err(::Error::Header) // this is a bad ipv6 address...
-                    }
-                } else {
-                    slice.rfind(':')
-                }
-            };
-
-            let port = idx.and_then(|idx| s[idx + 1..].parse().ok());
-
-            if let Some(idx) = idx {
-                s.truncate(idx)
-            }
-
-            Ok(Host {
-                hostname: s,
-                port: port
-            })
-        })
+       from_one_raw_str(raw)
     }
 
     fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -90,6 +61,35 @@ impl Header for Host {
     }
 }
 
+impl fmt::Display for Host {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.fmt_header(f)
+    }
+}
+
+impl FromStr for Host {
+    type Err = ::Error;
+
+    fn from_str(s: &str) -> ::Result<Host> {
+        let (host_port, res) = domain_to_unicode(s);
+        if res.is_err() {
+            return Err(::Error::Header)
+        }
+        let idx = host_port.rfind(':');
+        let port = idx.and_then(
+            |idx| s[idx + 1..].parse().ok()
+        );
+        let hostname = match idx {
+            None => host_port,
+            Some(idx) => host_port[..idx].to_owned()
+        };
+        Ok(Host {
+            hostname: hostname,
+            port: port
+        })
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::Host;

src/header/common/mod.rs

@@ -43,6 +43,7 @@ pub use self::if_unmodified_since::IfUnmodifiedSince;
 pub use self::if_range::IfRange;
 pub use self::last_modified::LastModified;
 pub use self::location::Location;
+pub use self::origin::Origin;
 pub use self::pragma::Pragma;
 pub use self::prefer::{Prefer, Preference};
 pub use self::preference_applied::PreferenceApplied;
@@ -402,6 +403,7 @@ mod if_range;
 mod if_unmodified_since;
 mod last_modified;
 mod location;
+mod origin;
 mod pragma;
 mod prefer;
 mod preference_applied;

src/header/common/origin.rs

@@ -0,0 +1,111 @@
+use header::{Header, Host};
+use std::fmt;
+use std::str::FromStr;
+use header::parsing::from_one_raw_str;
+
+/// The `Origin` header.
+///
+/// The `Origin` header is a version of the `Referer` header that is used for all HTTP fetches and `POST`s whose CORS flag is set.
+/// This header is often used to inform recipients of the security context of where the request was initiated.
+///
+///
+/// Following the spec, https://fetch.spec.whatwg.org/#origin-header, the value of this header is composed of
+/// a String (scheme), header::Host (host/port)
+///
+/// # Examples
+/// ```
+/// use hyper::header::{Headers, Origin};
+///
+/// let mut headers = Headers::new();
+/// headers.set(
+///     Origin::new("http", "hyper.rs", None)
+/// );
+/// ```
+/// ```
+/// use hyper::header::{Headers, Origin};
+///
+/// let mut headers = Headers::new();
+/// headers.set(
+///     Origin::new("https", "wikipedia.org", Some(443))
+/// );
+/// ```
+
+#[derive(Clone, Debug)]
+pub struct Origin {
+    /// The scheme, such as http or https
+    pub scheme: String,
+    /// The host, such as Host{hostname: "hyper.rs".to_owned(), port: None}
+    pub host: Host,
+}
+
+impl Origin {
+    /// Creates a new `Origin` header.
+    pub fn new<S: Into<String>, H: Into<String>>(scheme: S, hostname: H, port: Option<u16>) -> Origin{
+        Origin {
+            scheme: scheme.into(),
+            host: Host {
+                hostname: hostname.into(),
+                port: port
+            }
+        }
+    }
+}
+
+impl Header for Origin {
+    fn header_name() -> &'static str {
+        static NAME: &'static str = "Origin";
+        NAME
+    }
+
+    fn parse_header(raw: &[Vec<u8>]) -> ::Result<Origin> {
+        from_one_raw_str(raw)
+    }
+
+    fn fmt_header(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}://{}", self.scheme, self.host)
+    }
+}
+
+impl FromStr for Origin {
+    type Err = ::Error;
+
+    fn from_str(s: &str) -> ::Result<Origin> {
+        let idx = match s.find("://") {
+            Some(idx) => idx,
+            None => return Err(::Error::Header)
+        };
+        // idx + 3 because thats how long "://" is
+        let (scheme, etc) = (&s[..idx], &s[idx + 3..]);
+        let host = try!(Host::from_str(etc));
+
+
+        Ok(Origin{
+            scheme: scheme.to_owned(),
+            host: host
+        })
+    }
+}
+
+impl PartialEq for Origin {
+    fn eq(&self, other: &Origin) -> bool {
+        self.scheme == other.scheme && self.host == other.host
+    }
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::Origin;
+    use header::Header;
+
+    #[test]
+    fn test_origin() {
+        let origin = Header::parse_header([b"http://foo.com".to_vec()].as_ref());
+        assert_eq!(origin.ok(), Some(Origin::new("http", "foo.com", None)));
+
+        let origin = Header::parse_header([b"https://foo.com:443".to_vec()].as_ref());
+        assert_eq!(origin.ok(), Some(Origin::new("https", "foo.com", Some(443))));
+    }
+}
+
+bench_header!(bench, Origin, { vec![b"https://foo.com".to_vec()] });