1 files changed, 81 insertions, 0 deletions
diff --git a/third_party/rust/headers/src/common/user_agent.rs b/third_party/rust/headers/src/common/user_agent.rs
new file mode 100644
index 0000000000..fc1d8ba458
--- /dev/null
+++ b/third_party/rust/headers/src/common/user_agent.rs
@@ -0,0 +1,81 @@
+use std::fmt;
+use std::str::FromStr;
+
+use util::HeaderValueString;
+
+/// `User-Agent` header, defined in
+/// [RFC7231](http://tools.ietf.org/html/rfc7231#section-5.5.3)
+///
+/// The `User-Agent` header field contains information about the user
+/// agent originating the request, which is often used by servers to help
+/// identify the scope of reported interoperability problems, to work
+/// around or tailor responses to avoid particular user agent
+/// limitations, and for analytics regarding browser or operating system
+/// use.  A user agent SHOULD send a User-Agent field in each request
+/// unless specifically configured not to do so.
+///
+/// # ABNF
+///
+/// ```text
+/// User-Agent = product *( RWS ( product / comment ) )
+/// product         = token ["/" product-version]
+/// product-version = token
+/// ```
+///
+/// # Example values
+///
+/// * `CERN-LineMode/2.15 libwww/2.17b3`
+/// * `Bunnies`
+///
+/// # Notes
+///
+/// * The parser does not split the value
+///
+/// # Example
+///
+/// ```
+/// # extern crate headers;
+/// use headers::UserAgent;
+///
+/// let ua = UserAgent::from_static("hyper/0.12.2");
+/// ```
+#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct UserAgent(HeaderValueString);
+
+derive_header! {
+    UserAgent(_),
+    name: USER_AGENT
+}
+
+impl UserAgent {
+    /// Create a `UserAgent` from a static string.
+    ///
+    /// # Panic
+    ///
+    /// Panics if the static string is not a legal header value.
+    pub fn from_static(src: &'static str) -> UserAgent {
+        UserAgent(HeaderValueString::from_static(src))
+    }
+
+    /// View this `UserAgent` as a `&str`.
+    pub fn as_str(&self) -> &str {
+        self.0.as_str()
+    }
+}
+
+error_type!(InvalidUserAgent);
+
+impl FromStr for UserAgent {
+    type Err = InvalidUserAgent;
+    fn from_str(src: &str) -> Result<Self, Self::Err> {
+        HeaderValueString::from_str(src)
+            .map(UserAgent)
+            .map_err(|_| InvalidUserAgent { _inner: () })
+    }
+}
+
+impl fmt::Display for UserAgent {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(&self.0, f)
+    }
+}