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    //! Extractor for the "Basic" HTTP Authentication Scheme

    use std::borrow::Cow;

    use actix_utils::future::{ready, Ready};
    use actix_web::dev::{Payload, ServiceRequest};
    use actix_web::http::header::Header;
    use actix_web::{FromRequest, HttpRequest};

    use super::config::AuthExtractorConfig;
    use super::errors::AuthenticationError;
    use super::AuthExtractor;
    use crate::headers::authorization::{Authorization, Basic};
    use crate::headers::www_authenticate::basic::Basic as Challenge;

    /// [`BasicAuth`] extractor configuration,
    /// used for [`WWW-Authenticate`] header later.
    ///
    /// [`BasicAuth`]: ./struct.BasicAuth.html
    /// [`WWW-Authenticate`]:
    /// ../../headers/www_authenticate/struct.WwwAuthenticate.html
    #[derive(Debug, Clone, Default)]
    pub struct Config(Challenge);

    impl Config {
        /// Set challenge `realm` attribute.
        ///
        /// The "realm" attribute indicates the scope of protection in the manner
        /// described in HTTP/1.1 [RFC2617](https://tools.ietf.org/html/rfc2617#section-1.2).
        pub fn realm<T>(mut self, value: T) -> Config
        where
            T: Into<Cow<'static, str>>,
        {
            self.0.realm = Some(value.into());
            self
        }
    }

    impl AsRef<Challenge> for Config {
        fn as_ref(&self) -> &Challenge {
            &self.0
        }
    }

    impl AuthExtractorConfig for Config {
        type Inner = Challenge;

        fn into_inner(self) -> Self::Inner {
            self.0
        }
    }

    // Needs `fn main` to display complete example.
    #[allow(clippy::needless_doctest_main)]
    /// Extractor for HTTP Basic auth.
    ///
    /// # Example
    ///
    /// ```
    /// use actix_web::Result;
    /// use actix_web_httpauth::extractors::basic::BasicAuth;
    ///
    /// async fn index(auth: BasicAuth) -> String {
    ///     format!("Hello, {}!", auth.user_id())
    /// }
    /// ```
    ///
    /// If authentication fails, this extractor fetches the [`Config`] instance
    /// from the [app data] in order to properly form the `WWW-Authenticate`
    /// response header.
    ///
    /// ## Example
    ///
    /// ```
    /// use actix_web::{web, App};
    /// use actix_web_httpauth::extractors::basic::{BasicAuth, Config};
    ///
    /// async fn index(auth: BasicAuth) -> String {
    ///     format!("Hello, {}!", auth.user_id())
    /// }
    ///
    /// fn main() {
    ///     let app = App::new()
    ///         .app_data(Config::default().realm("Restricted area"))
    ///         .service(web::resource("/index.html").route(web::get().to(index)));
    /// }
    /// ```
    ///
    /// [`Config`]: ./struct.Config.html
    /// [app data]: https://docs.rs/actix-web/1.0.0-beta.5/actix_web/struct.App.html#method.data
    #[derive(Debug, Clone)]
    pub struct BasicAuth(Basic);

    impl BasicAuth {
        /// Returns client's user-ID.
        pub fn user_id(&self) -> &Cow<'static, str> {
            self.0.user_id()
        }

        /// Returns client's password.
        pub fn password(&self) -> Option<&Cow<'static, str>> {
            self.0.password()
        }
    }

    impl FromRequest for BasicAuth {
        type Future = Ready<Result<Self, Self::Error>>;
        type Error = AuthenticationError<Challenge>;

        fn from_request(req: &HttpRequest, _: &mut Payload) -> <Self as FromRequest>::Future {
            ready(
                Authorization::<Basic>::parse(req)
                    .map(|auth| BasicAuth(auth.into_scheme()))
                    .map_err(|_| {
                        // TODO: debug! the original error
                        let challenge = req
                            .app_data::<Config>()
                            .map(|config| config.0.clone())
                            // TODO: Add trace! about `Default::default` call
                            .unwrap_or_else(Default::default);

                        AuthenticationError::new(challenge)
                    }),
            )
        }
    }

    impl AuthExtractor for BasicAuth {
        type Error = AuthenticationError<Challenge>;
        type Future = Ready<Result<Self, Self::Error>>;

        fn from_service_request(req: &ServiceRequest) -> Self::Future {
            ready(
                Authorization::<Basic>::parse(req)
                    .map(|auth| BasicAuth(auth.into_scheme()))
                    .map_err(|_| {
                        // TODO: debug! the original error
                        let challenge = req
                            .app_data::<Config>()
                            .map(|config| config.0.clone())
                            // TODO: Add trace! about `Default::default` call
                            .unwrap_or_else(Default::default);

                        AuthenticationError::new(challenge)
                    }),
            )
        }
    }