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    //! Opinionated request identity service for Actix Web apps.
    //!
    //! [`IdentityService`] middleware can be used with different policies types to store
    //! identity information.
    //!
    //! A cookie based policy is provided. [`CookieIdentityPolicy`] uses cookies as identity storage.
    //!
    //! To access current request identity, use the [`Identity`] extractor.
    //!
    //! ```
    //! use actix_web::*;
    //! use actix_identity::{Identity, CookieIdentityPolicy, IdentityService};
    //!
    //! #[get("/")]
    //! async fn index(id: Identity) -> String {
    //!     // access request identity
    //!     if let Some(id) = id.identity() {
    //!         format!("Welcome! {}", id)
    //!     } else {
    //!         "Welcome Anonymous!".to_owned()
    //!     }
    //! }
    //!
    //! #[post("/login")]
    //! async fn login(id: Identity) -> HttpResponse {
    //!     // remember identity
    //!     id.remember("User1".to_owned());
    //!     HttpResponse::Ok().finish()
    //! }
    //!
    //! #[post("/logout")]
    //! async fn logout(id: Identity) -> HttpResponse {
    //!     // remove identity
    //!     id.forget();
    //!     HttpResponse::Ok().finish()
    //! }
    //!
    //! HttpServer::new(move || {
    //!     // create cookie identity backend (inside closure, since policy is not Clone)
    //!     let policy = CookieIdentityPolicy::new(&[0; 32])
    //!         .name("auth-cookie")
    //!         .secure(false);
    //!
    //!     App::new()
    //!         // wrap policy into middleware identity middleware
    //!         .wrap(IdentityService::new(policy))
    //!         .service(services![index, login, logout])
    //! })
    //! # ;
    //! ```

    #![deny(rust_2018_idioms, nonstandard_style)]
    #![warn(future_incompatible)]

    use std::future::Future;

    use actix_web::{
        dev::{ServiceRequest, ServiceResponse},
        Error, HttpMessage, Result,
    };

    mod cookie;
    mod identity;
    mod middleware;

    pub use self::cookie::CookieIdentityPolicy;
    pub use self::identity::Identity;
    pub use self::middleware::IdentityService;

    /// Identity policy.
    pub trait IdentityPolicy: Sized + 'static {
        /// The return type of the middleware
        type Future: Future<Output = Result<Option<String>, Error>>;

        /// The return type of the middleware
        type ResponseFuture: Future<Output = Result<(), Error>>;

        /// Parse the session from request and load data from a service identity.
        fn from_request(&self, req: &mut ServiceRequest) -> Self::Future;

        /// Write changes to response
        fn to_response<B>(
            &self,
            identity: Option<String>,
            changed: bool,
            response: &mut ServiceResponse<B>,
        ) -> Self::ResponseFuture;
    }

    /// Helper trait that allows to get Identity.
    ///
    /// It could be used in middleware but identity policy must be set before any other middleware that
    /// needs identity. RequestIdentity is implemented both for `ServiceRequest` and `HttpRequest`.
    pub trait RequestIdentity {
        fn get_identity(&self) -> Option<String>;
    }

    impl<T> RequestIdentity for T
    where
        T: HttpMessage,
    {
        fn get_identity(&self) -> Option<String> {
            Identity::get_identity(&self.extensions())
        }
    }

    #[cfg(test)]
    mod tests {
        use std::time::SystemTime;

        use actix_web::{
            body::{BoxBody, EitherBody},
            dev::ServiceResponse,
            test, web, App, Error,
        };

        use super::*;

        pub(crate) const COOKIE_KEY_MASTER: [u8; 32] = [0; 32];
        pub(crate) const COOKIE_NAME: &str = "actix_auth";
        pub(crate) const COOKIE_LOGIN: &str = "test";

        #[allow(clippy::enum_variant_names)]
        pub(crate) enum LoginTimestampCheck {
            NoTimestamp,
            NewTimestamp,
            OldTimestamp(SystemTime),
        }

        #[allow(clippy::enum_variant_names)]
        pub(crate) enum VisitTimeStampCheck {
            NoTimestamp,
            NewTimestamp,
        }

        pub(crate) async fn create_identity_server<
            F: Fn(CookieIdentityPolicy) -> CookieIdentityPolicy + Sync + Send + Clone + 'static,
        >(
            f: F,
        ) -> impl actix_service::Service<
            actix_http::Request,
            Response = ServiceResponse<EitherBody<BoxBody>>,
            Error = Error,
        > {
            test::init_service(
                App::new()
                    .wrap(IdentityService::new(f(CookieIdentityPolicy::new(
                        &COOKIE_KEY_MASTER,
                    )
                    .secure(false)
                    .name(COOKIE_NAME))))
                    .service(web::resource("/").to(|id: Identity| async move {
                        let identity = id.identity();
                        if identity.is_none() {
                            id.remember(COOKIE_LOGIN.to_string())
                        }
                        web::Json(identity)
                    })),
            )
            .await
        }
    }