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use std::fmt;
use std::str::FromStr;
use util::HeaderValueString;
/// `User-Agent` header, defined in
///
/// 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)
}
}