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use actix_web::error::ParseError;
use actix_web::http::header::{
    Header, HeaderName, HeaderValue, IntoHeaderValue, WWW_AUTHENTICATE,
};
use actix_web::HttpMessage;

use super::Challenge;

/// `WWW-Authenticate` header, described in [RFC 7235](https://tools.ietf.org/html/rfc7235#section-4.1)
///
/// This header is generic over [Challenge](./trait.Challenge.html) trait,
/// see [Basic](./basic/struct.Basic.html) and
/// [Bearer](./bearer/struct.Bearer.html) challenges for details.
#[derive(Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default, Clone)]
pub struct WwwAuthenticate<C: Challenge>(pub C);

impl<C: Challenge> Header for WwwAuthenticate<C> {
    fn name() -> HeaderName {
        WWW_AUTHENTICATE
    }

    fn parse<T: HttpMessage>(_msg: &T) -> Result<Self, ParseError> {
        unimplemented!()
    }
}

impl<C: Challenge> IntoHeaderValue for WwwAuthenticate<C> {
    type Error = <C as IntoHeaderValue>::Error;

    fn try_into_value(self) -> Result<HeaderValue, <Self as IntoHeaderValue>::Error> {
        self.0.try_into_value()
    }
}