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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{
    cell::{Ref, RefCell},
    collections::HashMap,
    error::Error <span class="kw">as </span>StdError,
    mem,
    rc::Rc,
};

<span class="kw">use </span>actix_utils::future::{ready, Ready};
<span class="kw">use </span>actix_web::{
    body::BoxBody,
    dev::{Extensions, Payload, ServiceRequest, ServiceResponse},
    error::Error,
    FromRequest, HttpMessage, HttpRequest, HttpResponse, ResponseError,
};
<span class="kw">use </span>anyhow::Context;
<span class="kw">use </span>derive_more::{Display, From};
<span class="kw">use </span>serde::{de::DeserializeOwned, Serialize};

<span class="doccomment">/// The primary interface to access and modify session state.
///
/// [`Session`] is an [extractor](#impl-FromRequest)—you can specify it as an input type for your
/// request handlers and it will be automatically extracted from the incoming request.
///
/// ```
/// use actix_session::Session;
///
/// async fn index(session: Session) -&gt; actix_web::Result&lt;&amp;'static str&gt; {
///     // access session data
///     if let Some(count) = session.get::&lt;i32&gt;("counter")? {
///         session.insert("counter", count + 1)?;
///     } else {
///         session.insert("counter", 1)?;
///     }
///
///     Ok("Welcome!")
/// }
/// # actix_web::web::to(index);
/// ```
///
/// You can also retrieve a [`Session`] object from an `HttpRequest` or a `ServiceRequest` using
/// [`SessionExt`].
///
/// [`SessionExt`]: crate::SessionExt
</span><span class="attr">#[derive(Clone)]
</span><span class="kw">pub struct </span>Session(Rc&lt;RefCell&lt;SessionInner&gt;&gt;);

<span class="doccomment">/// Status of a [`Session`].
</span><span class="attr">#[derive(Debug, Clone, Default, PartialEq, Eq)]
</span><span class="kw">pub enum </span>SessionStatus {
    <span class="doccomment">/// Session state has been updated - the changes will have to be persisted to the backend.
    </span>Changed,

    <span class="doccomment">/// The session has been flagged for deletion - the session cookie will be removed from
    /// the client and the session state will be deleted from the session store.
    ///
    /// Most operations on the session after it has been marked for deletion will have no effect.
    </span>Purged,

    <span class="doccomment">/// The session has been flagged for renewal.
    ///
    /// The session key will be regenerated and the time-to-live of the session state will be
    /// extended.
    </span>Renewed,

    <span class="doccomment">/// The session state has not been modified since its creation/retrieval.
    </span><span class="attr">#[default]
    </span>Unchanged,
}

<span class="attr">#[derive(Default)]
</span><span class="kw">struct </span>SessionInner {
    state: HashMap&lt;String, String&gt;,
    status: SessionStatus,
}

<span class="kw">impl </span>Session {
    <span class="doccomment">/// Get a `value` from the session.
    ///
    /// It returns an error if it fails to deserialize as `T` the JSON value associated with `key`.
    </span><span class="kw">pub fn </span>get&lt;T: DeserializeOwned&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;T&gt;, SessionGetError&gt; {
        <span class="kw">if let </span><span class="prelude-val">Some</span>(val_str) = <span class="self">self</span>.<span class="number">0</span>.borrow().state.get(key) {
            <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(
                serde_json::from_str(val_str)
                    .with_context(|| {
                        <span class="macro">format!</span>(
                            <span class="string">"Failed to deserialize the JSON-encoded session data attached to key \
                            `{}` as a `{}` type"</span>,
                            key,
                            std::any::type_name::&lt;T&gt;()
                        )
                    })
                    .map_err(SessionGetError)<span class="question-mark">?</span>,
            ))
        } <span class="kw">else </span>{
            <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
        }
    }

    <span class="doccomment">/// Get all raw key-value data from the session.
    ///
    /// Note that values are JSON encoded.
    </span><span class="kw">pub fn </span>entries(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Ref&lt;<span class="lifetime">'_</span>, HashMap&lt;String, String&gt;&gt; {
        Ref::map(<span class="self">self</span>.<span class="number">0</span>.borrow(), |inner| <span class="kw-2">&amp;</span>inner.state)
    }

    <span class="doccomment">/// Returns session status.
    </span><span class="kw">pub fn </span>status(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; SessionStatus {
        Ref::map(<span class="self">self</span>.<span class="number">0</span>.borrow(), |inner| <span class="kw-2">&amp;</span>inner.status).clone()
    }

    <span class="doccomment">/// Inserts a key-value pair into the session.
    ///
    /// Any serializable value can be used and will be encoded as JSON in session data, hence why
    /// only a reference to the value is taken.
    ///
    /// It returns an error if it fails to serialize `value` to JSON.
    </span><span class="kw">pub fn </span>insert&lt;T: Serialize&gt;(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        key: <span class="kw">impl </span>Into&lt;String&gt;,
        value: T,
    ) -&gt; <span class="prelude-ty">Result</span>&lt;(), SessionInsertError&gt; {
        <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.<span class="number">0</span>.borrow_mut();

        <span class="kw">if </span>inner.status != SessionStatus::Purged {
            <span class="kw">if </span>inner.status != SessionStatus::Renewed {
                inner.status = SessionStatus::Changed;
            }

            <span class="kw">let </span>key = key.into();
            <span class="kw">let </span>val = serde_json::to_string(<span class="kw-2">&amp;</span>value)
                .with_context(|| {
                    <span class="macro">format!</span>(
                        <span class="string">"Failed to serialize the provided `{}` type instance as JSON in order to \
                        attach as session data to the `{}` key"</span>,
                        std::any::type_name::&lt;T&gt;(),
                        <span class="kw-2">&amp;</span>key
                    )
                })
                .map_err(SessionInsertError)<span class="question-mark">?</span>;

            inner.state.insert(key, val);
        }

        <span class="prelude-val">Ok</span>(())
    }

    <span class="doccomment">/// Remove value from the session.
    ///
    /// If present, the JSON encoded value is returned.
    </span><span class="kw">pub fn </span>remove(<span class="kw-2">&amp;</span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Option</span>&lt;String&gt; {
        <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.<span class="number">0</span>.borrow_mut();

        <span class="kw">if </span>inner.status != SessionStatus::Purged {
            <span class="kw">if </span>inner.status != SessionStatus::Renewed {
                inner.status = SessionStatus::Changed;
            }
            <span class="kw">return </span>inner.state.remove(key);
        }

        <span class="prelude-val">None
    </span>}

    <span class="doccomment">/// Remove value from the session and deserialize.
    ///
    /// Returns `None` if key was not present in session. Returns `T` if deserialization succeeds,
    /// otherwise returns un-deserialized JSON string.
    </span><span class="kw">pub fn </span>remove_as&lt;T: DeserializeOwned&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;T, String&gt;&gt; {
        <span class="self">self</span>.remove(key)
            .map(|val_str| <span class="kw">match </span>serde_json::from_str(<span class="kw-2">&amp;</span>val_str) {
                <span class="prelude-val">Ok</span>(val) =&gt; <span class="prelude-val">Ok</span>(val),
                <span class="prelude-val">Err</span>(_err) =&gt; {
                    <span class="macro">tracing::debug!</span>(
                        <span class="string">"Removed value (key: {}) could not be deserialized as {}"</span>,
                        key,
                        std::any::type_name::&lt;T&gt;()
                    );

                    <span class="prelude-val">Err</span>(val_str)
                }
            })
    }

    <span class="doccomment">/// Clear the session.
    </span><span class="kw">pub fn </span>clear(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.<span class="number">0</span>.borrow_mut();

        <span class="kw">if </span>inner.status != SessionStatus::Purged {
            <span class="kw">if </span>inner.status != SessionStatus::Renewed {
                inner.status = SessionStatus::Changed;
            }
            inner.state.clear()
        }
    }

    <span class="doccomment">/// Removes session both client and server side.
    </span><span class="kw">pub fn </span>purge(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.<span class="number">0</span>.borrow_mut();
        inner.status = SessionStatus::Purged;
        inner.state.clear();
    }

    <span class="doccomment">/// Renews the session key, assigning existing session state to new key.
    </span><span class="kw">pub fn </span>renew(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="kw">let </span><span class="kw-2">mut </span>inner = <span class="self">self</span>.<span class="number">0</span>.borrow_mut();

        <span class="kw">if </span>inner.status != SessionStatus::Purged {
            inner.status = SessionStatus::Renewed;
        }
    }

    <span class="doccomment">/// Adds the given key-value pairs to the session on the request.
    ///
    /// Values that match keys already existing on the session will be overwritten. Values should
    /// already be JSON serialized.
    </span><span class="attr">#[allow(clippy::needless_pass_by_ref_mut)]
    </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_session(
        req: <span class="kw-2">&amp;mut </span>ServiceRequest,
        data: <span class="kw">impl </span>IntoIterator&lt;Item = (String, String)&gt;,
    ) {
        <span class="kw">let </span>session = Session::get_session(<span class="kw-2">&amp;mut </span>req.extensions_mut());
        <span class="kw">let </span><span class="kw-2">mut </span>inner = session.<span class="number">0</span>.borrow_mut();
        inner.state.extend(data);
    }

    <span class="doccomment">/// Returns session status and iterator of key-value pairs of changes.
    ///
    /// This is a destructive operation - the session state is removed from the request extensions
    /// typemap, leaving behind a new empty map. It should only be used when the session is being
    /// finalised (i.e. in `SessionMiddleware`).
    </span><span class="attr">#[allow(clippy::needless_pass_by_ref_mut)]
    </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>get_changes&lt;B&gt;(
        res: <span class="kw-2">&amp;mut </span>ServiceResponse&lt;B&gt;,
    ) -&gt; (SessionStatus, HashMap&lt;String, String&gt;) {
        <span class="kw">if let </span><span class="prelude-val">Some</span>(s_impl) = res
            .request()
            .extensions()
            .get::&lt;Rc&lt;RefCell&lt;SessionInner&gt;&gt;&gt;()
        {
            <span class="kw">let </span>state = mem::take(<span class="kw-2">&amp;mut </span>s_impl.borrow_mut().state);
            (s_impl.borrow().status.clone(), state)
        } <span class="kw">else </span>{
            (SessionStatus::Unchanged, HashMap::new())
        }
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>get_session(extensions: <span class="kw-2">&amp;mut </span>Extensions) -&gt; Session {
        <span class="kw">if let </span><span class="prelude-val">Some</span>(s_impl) = extensions.get::&lt;Rc&lt;RefCell&lt;SessionInner&gt;&gt;&gt;() {
            <span class="kw">return </span>Session(Rc::clone(s_impl));
        }

        <span class="kw">let </span>inner = Rc::new(RefCell::new(SessionInner::default()));
        extensions.insert(inner.clone());

        Session(inner)
    }
}

<span class="doccomment">/// Extractor implementation for [`Session`]s.
///
/// # Examples
/// ```
/// # use actix_web::*;
/// use actix_session::Session;
///
/// #[get("/")]
/// async fn index(session: Session) -&gt; Result&lt;impl Responder&gt; {
///     // access session data
///     if let Some(count) = session.get::&lt;i32&gt;("counter")? {
///         session.insert("counter", count + 1)?;
///     } else {
///         session.insert("counter", 1)?;
///     }
///
///     let count = session.get::&lt;i32&gt;("counter")?.unwrap();
///     Ok(format!("Counter: {}", count))
/// }
/// ```
</span><span class="kw">impl </span>FromRequest <span class="kw">for </span>Session {
    <span class="kw">type </span>Error = Error;
    <span class="kw">type </span>Future = Ready&lt;<span class="prelude-ty">Result</span>&lt;Session, Error&gt;&gt;;

    <span class="attr">#[inline]
    </span><span class="kw">fn </span>from_request(req: <span class="kw-2">&amp;</span>HttpRequest, <span class="kw">_</span>: <span class="kw-2">&amp;mut </span>Payload) -&gt; <span class="self">Self</span>::Future {
        ready(<span class="prelude-val">Ok</span>(Session::get_session(<span class="kw-2">&amp;mut </span>req.extensions_mut())))
    }
}

<span class="doccomment">/// Error returned by [`Session::get`].
</span><span class="attr">#[derive(Debug, Display, From)]
#[display(fmt = <span class="string">"{_0}"</span>)]
</span><span class="kw">pub struct </span>SessionGetError(anyhow::Error);

<span class="kw">impl </span>StdError <span class="kw">for </span>SessionGetError {
    <span class="kw">fn </span>source(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(<span class="kw">dyn </span>StdError + <span class="lifetime">'static</span>)&gt; {
        <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="number">0</span>.as_ref())
    }
}

<span class="kw">impl </span>ResponseError <span class="kw">for </span>SessionGetError {
    <span class="kw">fn </span>error_response(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; HttpResponse&lt;BoxBody&gt; {
        HttpResponse::new(<span class="self">self</span>.status_code())
    }
}

<span class="doccomment">/// Error returned by [`Session::insert`].
</span><span class="attr">#[derive(Debug, Display, From)]
#[display(fmt = <span class="string">"{_0}"</span>)]
</span><span class="kw">pub struct </span>SessionInsertError(anyhow::Error);

<span class="kw">impl </span>StdError <span class="kw">for </span>SessionInsertError {
    <span class="kw">fn </span>source(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(<span class="kw">dyn </span>StdError + <span class="lifetime">'static</span>)&gt; {
        <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="number">0</span>.as_ref())
    }
}

<span class="kw">impl </span>ResponseError <span class="kw">for </span>SessionInsertError {
    <span class="kw">fn </span>error_response(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; HttpResponse&lt;BoxBody&gt; {
        HttpResponse::new(<span class="self">self</span>.status_code())
    }
}
</code></pre></div></section></main></body></html>