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    //! Extractor for the "Bearer" HTTP Authentication Scheme.

    use std::{borrow::Cow, default::Default};

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

    use super::{config::AuthExtractorConfig, errors::AuthenticationError};
    pub use crate::headers::www_authenticate::bearer::Error;
    use crate::headers::{authorization, www_authenticate::bearer};

    /// [`BearerAuth`] extractor configuration.
    #[derive(Debug, Clone, Default)]
    pub struct Config(bearer::Bearer);

    impl Config {
        /// Set challenge `scope` attribute.
        ///
        /// The `"scope"` attribute is a space-delimited list of case-sensitive
        /// scope values indicating the required scope of the access token for
        /// accessing the requested resource.
        pub fn scope<T: Into<Cow<'static, str>>>(mut self, value: T) -> Config {
            self.0.scope = Some(value.into());
            self
        }

        /// Set challenge `realm` attribute.
        ///
        /// The "realm" attribute indicates the scope of protection in the manner
        /// described in HTTP/1.1 [RFC 2617](https://tools.ietf.org/html/rfc2617#section-1.2).
        pub fn realm<T: Into<Cow<'static, str>>>(mut self, value: T) -> Config {
            self.0.realm = Some(value.into());
            self
        }
    }

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

    impl AuthExtractorConfig for Config {
        type Inner = bearer::Bearer;

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

    /// Extractor for HTTP Bearer auth
    ///
    /// # Examples
    /// ```
    /// use actix_web_httpauth::extractors::bearer::BearerAuth;
    ///
    /// async fn index(auth: BearerAuth) -> String {
    ///     format!("Hello, user with token {}!", auth.token())
    /// }
    /// ```
    ///
    /// If authentication fails, this extractor fetches the [`Config`] instance
    /// from the [app data] in order to properly form the `WWW-Authenticate`
    /// response header.
    ///
    /// # Examples
    /// ```
    /// use actix_web::{web, App};
    /// use actix_web_httpauth::extractors::bearer::{self, BearerAuth};
    ///
    /// async fn index(auth: BearerAuth) -> String {
    ///     format!("Hello, {}!", auth.token())
    /// }
    ///
    /// App::new()
    ///     .app_data(
    ///         bearer::Config::default()
    ///             .realm("Restricted area")
    ///             .scope("email photo"),
    ///     )
    ///     .service(web::resource("/index.html").route(web::get().to(index)));
    /// ```
    #[derive(Debug, Clone)]
    pub struct BearerAuth(authorization::Bearer);

    impl BearerAuth {
        /// Returns bearer token provided by client.
        pub fn token(&self) -> &str {
            self.0.token()
        }
    }

    impl FromRequest for BearerAuth {
        type Future = Ready<Result<Self, Self::Error>>;
        type Error = AuthenticationError<bearer::Bearer>;

        fn from_request(req: &HttpRequest, _payload: &mut Payload) -> <Self as FromRequest>::Future {
            ready(
                authorization::Authorization::<authorization::Bearer>::parse(req)
                    .map(|auth| BearerAuth(auth.into_scheme()))
                    .map_err(|_| {
                        let bearer = req
                            .app_data::<Config>()
                            .map(|config| config.0.clone())
                            .unwrap_or_default();

                        AuthenticationError::new(bearer)
                    }),
            )
        }
    }

    /// Extended error customization for HTTP `Bearer` auth.
    impl AuthenticationError<bearer::Bearer> {
        /// Attach `Error` to the current Authentication error.
        ///
        /// Error status code will be changed to the one provided by the `kind`
        /// Error.
        pub fn with_error(mut self, kind: Error) -> Self {
            *self.status_code_mut() = kind.status_code();
            self.challenge_mut().error = Some(kind);
            self
        }

        /// Attach error description to the current Authentication error.
        pub fn with_error_description<T>(mut self, desc: T) -> Self
        where
            T: Into<Cow<'static, str>>,
        {
            self.challenge_mut().error_description = Some(desc.into());
            self
        }

        /// Attach error URI to the current Authentication error.
        ///
        /// It is up to implementor to provide properly formed absolute URI.
        pub fn with_error_uri<T>(mut self, uri: T) -> Self
        where
            T: Into<Cow<'static, str>>,
        {
            self.challenge_mut().error_uri = Some(uri.into());
            self
        }
    }