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</pre><pre class="rust"><code><span class="kw">use </span>std::rc::Rc;

<span class="kw">use </span>actix_session::SessionExt;
<span class="kw">use </span>actix_utils::future::{ready, Ready};
<span class="kw">use </span>actix_web::{
    body::MessageBody,
    cookie::time::{format_description::well_known::Rfc3339, OffsetDateTime},
    dev::{Service, ServiceRequest, ServiceResponse, Transform},
    Error, HttpMessage <span class="kw">as _</span>, <span class="prelude-ty">Result</span>,
};
<span class="kw">use </span>futures_core::future::LocalBoxFuture;

<span class="kw">use crate</span>::{
    config::{Configuration, IdentityMiddlewareBuilder},
    identity::IdentityInner,
    Identity,
};

<span class="doccomment">/// Identity management middleware.
///
/// ```no_run
/// use actix_web::{cookie::Key, App, HttpServer};
/// use actix_session::storage::RedisSessionStore;
/// use actix_identity::{Identity, IdentityMiddleware};
/// use actix_session::{Session, SessionMiddleware};
///
/// #[actix_web::main]
/// async fn main() {
///     let secret_key = Key::generate();
///     let redis_store = RedisSessionStore::new(&quot;redis://127.0.0.1:6379&quot;).await.unwrap();
///
///     HttpServer::new(move || {
///        App::new()
///            // Install the identity framework first.
///            .wrap(IdentityMiddleware::default())
///            // The identity system is built on top of sessions.
///            // You must install the session middleware to leverage `actix-identity`.
///            .wrap(SessionMiddleware::new(redis_store.clone(), secret_key.clone()))
///     })
/// # ;
/// }
/// ```
</span><span class="attribute">#[derive(Default, Clone)]
</span><span class="kw">pub struct </span>IdentityMiddleware {
    configuration: Rc&lt;Configuration&gt;,
}

<span class="kw">impl </span>IdentityMiddleware {
    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(configuration: Configuration) -&gt; <span class="self">Self </span>{
        <span class="self">Self </span>{
            configuration: Rc::new(configuration),
        }
    }

    <span class="doccomment">/// A fluent API to configure [`IdentityMiddleware`].
    </span><span class="kw">pub fn </span>builder() -&gt; IdentityMiddlewareBuilder {
        IdentityMiddlewareBuilder::new()
    }
}

<span class="kw">impl</span>&lt;S, B&gt; Transform&lt;S, ServiceRequest&gt; <span class="kw">for </span>IdentityMiddleware
<span class="kw">where
    </span>S: Service&lt;ServiceRequest, Response = ServiceResponse&lt;B&gt;, Error = Error&gt; + <span class="lifetime">&#39;static</span>,
    S::Future: <span class="lifetime">&#39;static</span>,
    B: MessageBody + <span class="lifetime">&#39;static</span>,
{
    <span class="kw">type </span>Response = ServiceResponse&lt;B&gt;;
    <span class="kw">type </span>Error = Error;
    <span class="kw">type </span>Transform = InnerIdentityMiddleware&lt;S&gt;;
    <span class="kw">type </span>InitError = ();
    <span class="kw">type </span>Future = Ready&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Transform, <span class="self">Self</span>::InitError&gt;&gt;;

    <span class="kw">fn </span>new_transform(<span class="kw-2">&amp;</span><span class="self">self</span>, service: S) -&gt; <span class="self">Self</span>::Future {
        ready(<span class="prelude-val">Ok</span>(InnerIdentityMiddleware {
            service: Rc::new(service),
            configuration: Rc::clone(<span class="kw-2">&amp;</span><span class="self">self</span>.configuration),
        }))
    }
}

<span class="attribute">#[doc(hidden)]
</span><span class="kw">pub struct </span>InnerIdentityMiddleware&lt;S&gt; {
    service: Rc&lt;S&gt;,
    configuration: Rc&lt;Configuration&gt;,
}

<span class="kw">impl</span>&lt;S&gt; Clone <span class="kw">for </span>InnerIdentityMiddleware&lt;S&gt; {
    <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
        <span class="self">Self </span>{
            service: Rc::clone(<span class="kw-2">&amp;</span><span class="self">self</span>.service),
            configuration: Rc::clone(<span class="kw-2">&amp;</span><span class="self">self</span>.configuration),
        }
    }
}

<span class="kw">impl</span>&lt;S, B&gt; Service&lt;ServiceRequest&gt; <span class="kw">for </span>InnerIdentityMiddleware&lt;S&gt;
<span class="kw">where
    </span>S: Service&lt;ServiceRequest, Response = ServiceResponse&lt;B&gt;, Error = Error&gt; + <span class="lifetime">&#39;static</span>,
    S::Future: <span class="lifetime">&#39;static</span>,
    B: MessageBody + <span class="lifetime">&#39;static</span>,
{
    <span class="kw">type </span>Response = ServiceResponse&lt;B&gt;;
    <span class="kw">type </span>Error = Error;
    <span class="kw">type </span>Future = LocalBoxFuture&lt;<span class="lifetime">&#39;static</span>, <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Response, <span class="self">Self</span>::Error&gt;&gt;;

    <span class="macro">actix_service::forward_ready!</span>(service);

    <span class="kw">fn </span>call(<span class="kw-2">&amp;</span><span class="self">self</span>, req: ServiceRequest) -&gt; <span class="self">Self</span>::Future {
        <span class="kw">let </span>srv = Rc::clone(<span class="kw-2">&amp;</span><span class="self">self</span>.service);
        <span class="kw">let </span>configuration = Rc::clone(<span class="kw-2">&amp;</span><span class="self">self</span>.configuration);
        Box::pin(<span class="kw">async move </span>{
            <span class="kw">let </span>identity_inner = IdentityInner {
                session: req.get_session(),
                logout_behaviour: configuration.on_logout.clone(),
                is_login_deadline_enabled: configuration.login_deadline.is_some(),
                is_visit_deadline_enabled: configuration.visit_deadline.is_some(),
            };
            req.extensions_mut().insert(identity_inner);
            enforce_policies(<span class="kw-2">&amp;</span>req, <span class="kw-2">&amp;</span>configuration);
            srv.call(req).<span class="kw">await
        </span>})
    }
}

<span class="comment">// easier to scan with returns where they are
// especially if the function body were to evolve in the future
</span><span class="attribute">#[allow(clippy::needless_return)]
</span><span class="kw">fn </span>enforce_policies(req: <span class="kw-2">&amp;</span>ServiceRequest, configuration: <span class="kw-2">&amp;</span>Configuration) {
    <span class="kw">let </span>must_extract_identity =
        configuration.login_deadline.is_some() || configuration.visit_deadline.is_some();

    <span class="kw">if </span>!must_extract_identity {
        <span class="kw">return</span>;
    }

    <span class="kw">let </span>identity = <span class="kw">match </span>Identity::extract(<span class="kw-2">&amp;</span>req.extensions()) {
        <span class="prelude-val">Ok</span>(identity) =&gt; identity,
        <span class="prelude-val">Err</span>(err) =&gt; {
            <span class="macro">tracing::debug!</span>(
                error.display = %err,
                error.debug = <span class="question-mark">?</span>err,
                <span class="string">&quot;Failed to extract an `Identity` from the incoming request.&quot;
            </span>);
            <span class="kw">return</span>;
        }
    };

    <span class="kw">if let </span><span class="prelude-val">Some</span>(login_deadline) = configuration.login_deadline {
        <span class="kw">if </span><span class="macro">matches!</span>(
            enforce_login_deadline(<span class="kw-2">&amp;</span>identity, login_deadline),
            PolicyDecision::LogOut
        ) {
            identity.logout();
            <span class="kw">return</span>;
        }
    }

    <span class="kw">if let </span><span class="prelude-val">Some</span>(visit_deadline) = configuration.visit_deadline {
        <span class="kw">if </span><span class="macro">matches!</span>(
            enforce_visit_deadline(<span class="kw-2">&amp;</span>identity, visit_deadline),
            PolicyDecision::LogOut
        ) {
            identity.logout();
            <span class="kw">return</span>;
        } <span class="kw">else if let </span><span class="prelude-val">Err</span>(err) = identity.set_last_visited_at() {
            <span class="macro">tracing::warn!</span>(
                error.display = %err,
                error.debug = <span class="question-mark">?</span>err,
                <span class="string">&quot;Failed to set the last visited timestamp on `Identity` for an incoming request.&quot;
            </span>);
        }
    }
}

<span class="kw">fn </span>enforce_login_deadline(
    identity: <span class="kw-2">&amp;</span>Identity,
    login_deadline: std::time::Duration,
) -&gt; PolicyDecision {
    <span class="kw">match </span>identity.logged_at() {
        <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) =&gt; {
            <span class="macro">tracing::info!</span>(
                <span class="string">&quot;Login deadline is enabled, but there is no login timestamp in the session \
                state attached to the incoming request. Logging the user out.&quot;
            </span>);
            PolicyDecision::LogOut
        }
        <span class="prelude-val">Err</span>(err) =&gt; {
            <span class="macro">tracing::info!</span>(
                error.display = %err,
                error.debug = <span class="question-mark">?</span>err,
                <span class="string">&quot;Login deadline is enabled but we failed to extract the login timestamp from the \
                session state attached to the incoming request. Logging the user out.&quot;
            </span>);
            PolicyDecision::LogOut
        }
        <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(logged_in_at)) =&gt; {
            <span class="kw">let </span>elapsed = OffsetDateTime::now_utc() - logged_in_at;
            <span class="kw">if </span>elapsed &gt; login_deadline {
                <span class="macro">tracing::info!</span>(
                    user.logged_in_at = %logged_in_at.format(<span class="kw-2">&amp;</span>Rfc3339).unwrap_or_default(),
                    identity.login_deadline_seconds = login_deadline.as_secs(),
                    identity.elapsed_since_login_seconds = elapsed.whole_seconds(),
                    <span class="string">&quot;Login deadline is enabled and too much time has passed since the user logged \
                    in. Logging the user out.&quot;
                </span>);
                PolicyDecision::LogOut
            } <span class="kw">else </span>{
                PolicyDecision::StayLoggedIn
            }
        }
    }
}

<span class="kw">fn </span>enforce_visit_deadline(
    identity: <span class="kw-2">&amp;</span>Identity,
    visit_deadline: std::time::Duration,
) -&gt; PolicyDecision {
    <span class="kw">match </span>identity.last_visited_at() {
        <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) =&gt; {
            <span class="macro">tracing::info!</span>(
                <span class="string">&quot;Last visit deadline is enabled, but there is no last visit timestamp in the \
                session state attached to the incoming request. Logging the user out.&quot;
            </span>);
            PolicyDecision::LogOut
        }
        <span class="prelude-val">Err</span>(err) =&gt; {
            <span class="macro">tracing::info!</span>(
                error.display = %err,
                error.debug = <span class="question-mark">?</span>err,
                <span class="string">&quot;Last visit deadline is enabled but we failed to extract the last visit timestamp \
                from the session state attached to the incoming request. Logging the user out.&quot;
            </span>);
            PolicyDecision::LogOut
        }
        <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(last_visited_at)) =&gt; {
            <span class="kw">let </span>elapsed = OffsetDateTime::now_utc() - last_visited_at;
            <span class="kw">if </span>elapsed &gt; visit_deadline {
                <span class="macro">tracing::info!</span>(
                    user.last_visited_at = %last_visited_at.format(<span class="kw-2">&amp;</span>Rfc3339).unwrap_or_default(),
                    identity.visit_deadline_seconds = visit_deadline.as_secs(),
                    identity.elapsed_since_last_visit_seconds = elapsed.whole_seconds(),
                    <span class="string">&quot;Last visit deadline is enabled and too much time has passed since the last \
                    time the user visited. Logging the user out.&quot;
                </span>);
                PolicyDecision::LogOut
            } <span class="kw">else </span>{
                PolicyDecision::StayLoggedIn
            }
        }
    }
}

<span class="kw">enum </span>PolicyDecision {
    StayLoggedIn,
    LogOut,
}
</code></pre></div>
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