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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">collections::HashMap</span>, <span class="ident">convert::TryInto</span>, <span class="ident">fmt</span>, <span class="ident">future::Future</span>, <span class="ident">pin::Pin</span>, <span class="ident">rc::Rc</span>};
<span class="kw">use</span> <span class="ident">actix_utils::future</span>::{<span class="ident">ready</span>, <span class="ident">Ready</span>};
<span class="kw">use</span> <span class="ident">actix_web</span>::{
<span class="ident">body::MessageBody</span>,
<span class="ident">cookie</span>::{<span class="ident">Cookie</span>, <span class="ident">CookieJar</span>, <span class="ident">Key</span>},
<span class="ident">dev</span>::{<span class="ident">forward_ready</span>, <span class="ident">ResponseHead</span>, <span class="ident">Service</span>, <span class="ident">ServiceRequest</span>, <span class="ident">ServiceResponse</span>, <span class="ident">Transform</span>},
<span class="ident">http::header</span>::{<span class="ident">HeaderValue</span>, <span class="ident">SET_COOKIE</span>},
<span class="ident">HttpResponse</span>,
};
<span class="kw">use</span> <span class="ident">anyhow::Context</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{
<span class="ident">config</span>::{
<span class="self">self</span>, <span class="ident">Configuration</span>, <span class="ident">CookieConfiguration</span>, <span class="ident">CookieContentSecurity</span>, <span class="ident">SessionMiddlewareBuilder</span>,
<span class="ident">TtlExtensionPolicy</span>,
},
<span class="ident">storage</span>::{<span class="ident">LoadError</span>, <span class="ident">SessionKey</span>, <span class="ident">SessionStore</span>},
<span class="ident">Session</span>, <span class="ident">SessionStatus</span>,
};
<span class="doccomment">/// A middleware for session management in Actix Web applications.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`SessionMiddleware`] takes care of a few jobs:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - Instructs the session storage backend to create/update/delete/retrieve the state attached to</span>
<span class="doccomment">/// a session according to its status and the operations that have been performed against it;</span>
<span class="doccomment">/// - Set/remove a cookie, on the client side, to enable a user to be consistently associated with</span>
<span class="doccomment">/// the same session across multiple HTTP requests.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Use [`SessionMiddleware::new`] to initialize the session framework using the default parameters.</span>
<span class="doccomment">/// To create a new instance of [`SessionMiddleware`] you need to provide:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - an instance of the session storage backend you wish to use (i.e. an implementation of</span>
<span class="doccomment">/// [`SessionStore`]);</span>
<span class="doccomment">/// - a secret key, to sign or encrypt the content of client-side session cookie.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use actix_web::{web, App, HttpServer, HttpResponse, Error};</span>
<span class="doccomment">/// use actix_session::{Session, SessionMiddleware, storage::RedisActorSessionStore};</span>
<span class="doccomment">/// use actix_web::cookie::Key;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The secret key would usually be read from a configuration file/environment variables.</span>
<span class="doccomment">/// fn get_secret_key() -> Key {</span>
<span class="doccomment">/// # todo!()</span>
<span class="doccomment">/// // [...]</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[actix_web::main]</span>
<span class="doccomment">/// async fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let secret_key = get_secret_key();</span>
<span class="doccomment">/// let redis_connection_string = "127.0.0.1:6379";</span>
<span class="doccomment">/// HttpServer::new(move ||</span>
<span class="doccomment">/// App::new()</span>
<span class="doccomment">/// // Add session management to your application using Redis for session state storage</span>
<span class="doccomment">/// .wrap(</span>
<span class="doccomment">/// SessionMiddleware::new(</span>
<span class="doccomment">/// RedisActorSessionStore::new(redis_connection_string),</span>
<span class="doccomment">/// secret_key.clone()</span>
<span class="doccomment">/// )</span>
<span class="doccomment">/// )</span>
<span class="doccomment">/// .default_service(web::to(|| HttpResponse::Ok())))</span>
<span class="doccomment">/// .bind(("127.0.0.1", 8080))?</span>
<span class="doccomment">/// .run()</span>
<span class="doccomment">/// .await</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If you want to customise use [`builder`](Self::builder) instead of [`new`](Self::new):</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use actix_web::{App, cookie::{Key, time}, Error, HttpResponse, HttpServer, web};</span>
<span class="doccomment">/// use actix_session::{Session, SessionMiddleware, storage::RedisActorSessionStore};</span>
<span class="doccomment">/// use actix_session::config::PersistentSession;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The secret key would usually be read from a configuration file/environment variables.</span>
<span class="doccomment">/// fn get_secret_key() -> Key {</span>
<span class="doccomment">/// # todo!()</span>
<span class="doccomment">/// // [...]</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[actix_web::main]</span>
<span class="doccomment">/// async fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let secret_key = get_secret_key();</span>
<span class="doccomment">/// let redis_connection_string = "127.0.0.1:6379";</span>
<span class="doccomment">/// HttpServer::new(move ||</span>
<span class="doccomment">/// App::new()</span>
<span class="doccomment">/// // Customise session length!</span>
<span class="doccomment">/// .wrap(</span>
<span class="doccomment">/// SessionMiddleware::builder(</span>
<span class="doccomment">/// RedisActorSessionStore::new(redis_connection_string),</span>
<span class="doccomment">/// secret_key.clone()</span>
<span class="doccomment">/// )</span>
<span class="doccomment">/// .session_lifecycle(</span>
<span class="doccomment">/// PersistentSession::default()</span>
<span class="doccomment">/// .session_ttl(time::Duration::days(5))</span>
<span class="doccomment">/// )</span>
<span class="doccomment">/// .build(),</span>
<span class="doccomment">/// )</span>
<span class="doccomment">/// .default_service(web::to(|| HttpResponse::Ok())))</span>
<span class="doccomment">/// .bind(("127.0.0.1", 8080))?</span>
<span class="doccomment">/// .run()</span>
<span class="doccomment">/// .await</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## How did we choose defaults?</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You should not regret adding `actix-session` to your dependencies and going to production using</span>
<span class="doccomment">/// the default configuration. That is why, when in doubt, we opt to use the most secure option for</span>
<span class="doccomment">/// each configuration parameter.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// We expose knobs to change the default to suit your needs—i.e., if you know what you are doing,</span>
<span class="doccomment">/// we will not stop you. But being a subject-matter expert should not be a requirement to deploy</span>
<span class="doccomment">/// reasonably secure implementation of sessions.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SessionMiddleware</span><span class="op"><</span><span class="ident">Store</span>: <span class="ident">SessionStore</span><span class="op">></span> {
<span class="ident">storage_backend</span>: <span class="ident">Rc</span><span class="op"><</span><span class="ident">Store</span><span class="op">></span>,
<span class="ident">configuration</span>: <span class="ident">Rc</span><span class="op"><</span><span class="ident">Configuration</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">Store</span>: <span class="ident">SessionStore</span><span class="op">></span> <span class="ident">SessionMiddleware</span><span class="op"><</span><span class="ident">Store</span><span class="op">></span> {
<span class="doccomment">/// Use [`SessionMiddleware::new`] to initialize the session framework using the default</span>
<span class="doccomment">/// parameters.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To create a new instance of [`SessionMiddleware`] you need to provide:</span>
<span class="doccomment">/// - an instance of the session storage backend you wish to use (i.e. an implementation of</span>
<span class="doccomment">/// [`SessionStore]);</span>
<span class="doccomment">/// - a secret key, to sign or encrypt the content of client-side session cookie.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">store</span>: <span class="ident">Store</span>, <span class="ident">key</span>: <span class="ident">Key</span>) -> <span class="self">Self</span> {
<span class="ident"><span class="self">Self</span>::builder</span>(<span class="ident">store</span>, <span class="ident">key</span>).<span class="ident">build</span>()
}
<span class="doccomment">/// A fluent API to configure [`SessionMiddleware`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It takes as input the two required inputs to create a new instance of [`SessionMiddleware`]:</span>
<span class="doccomment">/// - an instance of the session storage backend you wish to use (i.e. an implementation of</span>
<span class="doccomment">/// [`SessionStore]);</span>
<span class="doccomment">/// - a secret key, to sign or encrypt the content of client-side session cookie.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">builder</span>(<span class="ident">store</span>: <span class="ident">Store</span>, <span class="ident">key</span>: <span class="ident">Key</span>) -> <span class="ident">SessionMiddlewareBuilder</span><span class="op"><</span><span class="ident">Store</span><span class="op">></span> {
<span class="ident">SessionMiddlewareBuilder::new</span>(<span class="ident">store</span>, <span class="ident">config::default_configuration</span>(<span class="ident">key</span>))
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">from_parts</span>(<span class="ident">store</span>: <span class="ident">Store</span>, <span class="ident">configuration</span>: <span class="ident">Configuration</span>) -> <span class="self">Self</span> {
<span class="self">Self</span> {
<span class="ident">storage_backend</span>: <span class="ident">Rc::new</span>(<span class="ident">store</span>),
<span class="ident">configuration</span>: <span class="ident">Rc::new</span>(<span class="ident">configuration</span>),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">B</span>, <span class="ident">Store</span><span class="op">></span> <span class="ident">Transform</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">ServiceRequest</span><span class="op">></span> <span class="kw">for</span> <span class="ident">SessionMiddleware</span><span class="op"><</span><span class="ident">Store</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">S</span>: <span class="ident">Service</span><span class="op"><</span><span class="ident">ServiceRequest</span>, <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">actix_web::Error</span><span class="op">></span> <span class="op">+</span> <span class="lifetime">'static</span>,
<span class="ident">S::Future</span>: <span class="lifetime">'static</span>,
<span class="ident">B</span>: <span class="ident">MessageBody</span> <span class="op">+</span> <span class="lifetime">'static</span>,
<span class="ident">Store</span>: <span class="ident">SessionStore</span> <span class="op">+</span> <span class="lifetime">'static</span>,
{
<span class="kw">type</span> <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">actix_web::Error</span>;
<span class="kw">type</span> <span class="ident">Transform</span> <span class="op">=</span> <span class="ident">InnerSessionMiddleware</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">Store</span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">InitError</span> <span class="op">=</span> ();
<span class="kw">type</span> <span class="ident">Future</span> <span class="op">=</span> <span class="ident">Ready</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Transform</span>, <span class="ident"><span class="self">Self</span>::InitError</span><span class="op">></span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">new_transform</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">service</span>: <span class="ident">S</span>) -> <span class="ident"><span class="self">Self</span>::Future</span> {
<span class="ident">ready</span>(<span class="prelude-val">Ok</span>(<span class="ident">InnerSessionMiddleware</span> {
<span class="ident">service</span>: <span class="ident">Rc::new</span>(<span class="ident">service</span>),
<span class="ident">configuration</span>: <span class="ident">Rc::clone</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">configuration</span>),
<span class="ident">storage_backend</span>: <span class="ident">Rc::clone</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">storage_backend</span>),
}))
}
}
<span class="doccomment">/// Short-hand to create an `actix_web::Error` instance that will result in an `Internal Server</span>
<span class="doccomment">/// Error` response while preserving the error root cause (e.g. in logs).</span>
<span class="kw">fn</span> <span class="ident">e500</span><span class="op"><</span><span class="ident">E</span>: <span class="ident">fmt::Debug</span> <span class="op">+</span> <span class="ident">fmt::Display</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span>(<span class="ident">err</span>: <span class="ident">E</span>) -> <span class="ident">actix_web::Error</span> {
<span class="comment">// We do not use `actix_web::error::ErrorInternalServerError` because we do not want to</span>
<span class="comment">// leak internal implementation details to the caller.</span>
<span class="comment">//</span>
<span class="comment">// `actix_web::error::ErrorInternalServerError` includes the error Display representation</span>
<span class="comment">// as body of the error responses, leading to messages like "There was an issue persisting</span>
<span class="comment">// the session state" reaching API clients. We don't want that, we want opaque 500s.</span>
<span class="ident">actix_web::error::InternalError::from_response</span>(
<span class="ident">err</span>,
<span class="ident">HttpResponse::InternalServerError</span>().<span class="ident">finish</span>(),
)
.<span class="ident">into</span>()
}
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">non_exhaustive</span>]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">InnerSessionMiddleware</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">Store</span>: <span class="ident">SessionStore</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span> {
<span class="ident">service</span>: <span class="ident">Rc</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>,
<span class="ident">configuration</span>: <span class="ident">Rc</span><span class="op"><</span><span class="ident">Configuration</span><span class="op">></span>,
<span class="ident">storage_backend</span>: <span class="ident">Rc</span><span class="op"><</span><span class="ident">Store</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">B</span>, <span class="ident">Store</span><span class="op">></span> <span class="ident">Service</span><span class="op"><</span><span class="ident">ServiceRequest</span><span class="op">></span> <span class="kw">for</span> <span class="ident">InnerSessionMiddleware</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">Store</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">S</span>: <span class="ident">Service</span><span class="op"><</span><span class="ident">ServiceRequest</span>, <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">actix_web::Error</span><span class="op">></span> <span class="op">+</span> <span class="lifetime">'static</span>,
<span class="ident">S::Future</span>: <span class="lifetime">'static</span>,
<span class="ident">Store</span>: <span class="ident">SessionStore</span> <span class="op">+</span> <span class="lifetime">'static</span>,
{
<span class="kw">type</span> <span class="ident">Response</span> <span class="op">=</span> <span class="ident">ServiceResponse</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>;
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">actix_web::Error</span>;
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::type_complexity</span>)]</span>
<span class="kw">type</span> <span class="ident">Future</span> <span class="op">=</span> <span class="ident">Pin</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Future</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Response</span>, <span class="ident"><span class="self">Self</span>::Error</span><span class="op">></span><span class="op">></span><span class="op">></span><span class="op">></span>;
<span class="macro">forward_ready!</span>(<span class="ident">service</span>);
<span class="kw">fn</span> <span class="ident">call</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">req</span>: <span class="ident">ServiceRequest</span>) -> <span class="ident"><span class="self">Self</span>::Future</span> {
<span class="kw">let</span> <span class="ident">service</span> <span class="op">=</span> <span class="ident">Rc::clone</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">service</span>);
<span class="kw">let</span> <span class="ident">storage_backend</span> <span class="op">=</span> <span class="ident">Rc::clone</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">storage_backend</span>);
<span class="kw">let</span> <span class="ident">configuration</span> <span class="op">=</span> <span class="ident">Rc::clone</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">configuration</span>);
<span class="ident">Box::pin</span>(<span class="kw">async</span> <span class="kw">move</span> {
<span class="kw">let</span> <span class="ident">session_key</span> <span class="op">=</span> <span class="ident">extract_session_key</span>(<span class="kw-2">&</span><span class="ident">req</span>, <span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">cookie</span>);
<span class="kw">let</span> (<span class="ident">session_key</span>, <span class="ident">session_state</span>) <span class="op">=</span>
<span class="ident">load_session_state</span>(<span class="ident">session_key</span>, <span class="ident">storage_backend</span>.<span class="ident">as_ref</span>()).<span class="kw">await</span><span class="question-mark">?</span>;
<span class="ident">Session::set_session</span>(<span class="kw-2">&mut</span> <span class="ident">req</span>, <span class="ident">session_state</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">service</span>.<span class="ident">call</span>(<span class="ident">req</span>).<span class="kw">await</span><span class="question-mark">?</span>;
<span class="kw">let</span> (<span class="ident">status</span>, <span class="ident">session_state</span>) <span class="op">=</span> <span class="ident">Session::get_changes</span>(<span class="kw-2">&mut</span> <span class="ident">res</span>);
<span class="kw">match</span> <span class="ident">session_key</span> {
<span class="prelude-val">None</span> => {
<span class="comment">// we do not create an entry in the session store if there is no state attached</span>
<span class="comment">// to a fresh session</span>
<span class="kw">if</span> <span class="op">!</span><span class="ident">session_state</span>.<span class="ident">is_empty</span>() {
<span class="kw">let</span> <span class="ident">session_key</span> <span class="op">=</span> <span class="ident">storage_backend</span>
.<span class="ident">save</span>(<span class="ident">session_state</span>, <span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">session</span>.<span class="ident">state_ttl</span>)
.<span class="kw">await</span>
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
<span class="ident">set_session_cookie</span>(
<span class="ident">res</span>.<span class="ident">response_mut</span>().<span class="ident">head_mut</span>(),
<span class="ident">session_key</span>,
<span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">cookie</span>,
)
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
}
}
<span class="prelude-val">Some</span>(<span class="ident">session_key</span>) => {
<span class="kw">match</span> <span class="ident">status</span> {
<span class="ident">SessionStatus::Changed</span> => {
<span class="kw">let</span> <span class="ident">session_key</span> <span class="op">=</span> <span class="ident">storage_backend</span>
.<span class="ident">update</span>(
<span class="ident">session_key</span>,
<span class="ident">session_state</span>,
<span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">session</span>.<span class="ident">state_ttl</span>,
)
.<span class="kw">await</span>
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
<span class="ident">set_session_cookie</span>(
<span class="ident">res</span>.<span class="ident">response_mut</span>().<span class="ident">head_mut</span>(),
<span class="ident">session_key</span>,
<span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">cookie</span>,
)
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
}
<span class="ident">SessionStatus::Purged</span> => {
<span class="ident">storage_backend</span>.<span class="ident">delete</span>(<span class="kw-2">&</span><span class="ident">session_key</span>).<span class="kw">await</span>.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
<span class="ident">delete_session_cookie</span>(
<span class="ident">res</span>.<span class="ident">response_mut</span>().<span class="ident">head_mut</span>(),
<span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">cookie</span>,
)
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
}
<span class="ident">SessionStatus::Renewed</span> => {
<span class="ident">storage_backend</span>.<span class="ident">delete</span>(<span class="kw-2">&</span><span class="ident">session_key</span>).<span class="kw">await</span>.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">session_key</span> <span class="op">=</span> <span class="ident">storage_backend</span>
.<span class="ident">save</span>(<span class="ident">session_state</span>, <span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">session</span>.<span class="ident">state_ttl</span>)
.<span class="kw">await</span>
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
<span class="ident">set_session_cookie</span>(
<span class="ident">res</span>.<span class="ident">response_mut</span>().<span class="ident">head_mut</span>(),
<span class="ident">session_key</span>,
<span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">cookie</span>,
)
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
}
<span class="ident">SessionStatus::Unchanged</span> => {
<span class="kw">if</span> <span class="macro">matches!</span>(
<span class="ident">configuration</span>.<span class="ident">ttl_extension_policy</span>,
<span class="ident">TtlExtensionPolicy::OnEveryRequest</span>
) {
<span class="ident">storage_backend</span>
.<span class="ident">update_ttl</span>(<span class="kw-2">&</span><span class="ident">session_key</span>, <span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">session</span>.<span class="ident">state_ttl</span>)
.<span class="kw">await</span>
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="ident">configuration</span>.<span class="ident">cookie</span>.<span class="ident">max_age</span>.<span class="ident">is_some</span>() {
<span class="ident">set_session_cookie</span>(
<span class="ident">res</span>.<span class="ident">response_mut</span>().<span class="ident">head_mut</span>(),
<span class="ident">session_key</span>,
<span class="kw-2">&</span><span class="ident">configuration</span>.<span class="ident">cookie</span>,
)
.<span class="ident">map_err</span>(<span class="ident">e500</span>)<span class="question-mark">?</span>;
}
}
}
};
}
}
<span class="prelude-val">Ok</span>(<span class="ident">res</span>)
})
}
}
<span class="doccomment">/// Examines the session cookie attached to the incoming request, if there is one, and tries</span>
<span class="doccomment">/// to extract the session key.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It returns `None` if there is no session cookie or if the session cookie is considered invalid</span>
<span class="doccomment">/// (e.g., when failing a signature check).</span>
<span class="kw">fn</span> <span class="ident">extract_session_key</span>(<span class="ident">req</span>: <span class="kw-2">&</span><span class="ident">ServiceRequest</span>, <span class="ident">config</span>: <span class="kw-2">&</span><span class="ident">CookieConfiguration</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">SessionKey</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">cookies</span> <span class="op">=</span> <span class="ident">req</span>.<span class="ident">cookies</span>().<span class="ident">ok</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">session_cookie</span> <span class="op">=</span> <span class="ident">cookies</span>
.<span class="ident">iter</span>()
.<span class="ident">find</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">cookie</span><span class="op">|</span> <span class="ident">cookie</span>.<span class="ident">name</span>() <span class="op">==</span> <span class="ident">config</span>.<span class="ident">name</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">jar</span> <span class="op">=</span> <span class="ident">CookieJar::new</span>();
<span class="ident">jar</span>.<span class="ident">add_original</span>(<span class="ident">session_cookie</span>.<span class="ident">clone</span>());
<span class="kw">let</span> <span class="ident">verification_result</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">config</span>.<span class="ident">content_security</span> {
<span class="ident">CookieContentSecurity::Signed</span> => <span class="ident">jar</span>.<span class="ident">signed</span>(<span class="kw-2">&</span><span class="ident">config</span>.<span class="ident">key</span>).<span class="ident">get</span>(<span class="kw-2">&</span><span class="ident">config</span>.<span class="ident">name</span>),
<span class="ident">CookieContentSecurity::Private</span> => <span class="ident">jar</span>.<span class="ident">private</span>(<span class="kw-2">&</span><span class="ident">config</span>.<span class="ident">key</span>).<span class="ident">get</span>(<span class="kw-2">&</span><span class="ident">config</span>.<span class="ident">name</span>),
};
<span class="kw">if</span> <span class="ident">verification_result</span>.<span class="ident">is_none</span>() {
<span class="macro">tracing::warn!</span>(
<span class="string">"The session cookie attached to the incoming request failed to pass cryptographic \
checks (signature verification/decryption)."</span>
);
}
<span class="kw">match</span> <span class="ident">verification_result</span><span class="question-mark">?</span>.<span class="ident">value</span>().<span class="ident">to_owned</span>().<span class="ident">try_into</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">session_key</span>) => <span class="prelude-val">Some</span>(<span class="ident">session_key</span>),
<span class="prelude-val">Err</span>(<span class="ident">err</span>) => {
<span class="macro">tracing::warn!</span>(
<span class="ident">error</span>.<span class="ident">message</span> <span class="op">=</span> <span class="op">%</span><span class="ident">err</span>,
<span class="ident">error</span>.<span class="ident">cause_chain</span> <span class="op">=</span> <span class="question-mark">?</span><span class="ident">err</span>,
<span class="string">"Invalid session key, ignoring."</span>
);
<span class="prelude-val">None</span>
}
}
}
<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">load_session_state</span><span class="op"><</span><span class="ident">Store</span>: <span class="ident">SessionStore</span><span class="op">></span>(
<span class="ident">session_key</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">SessionKey</span><span class="op">></span>,
<span class="ident">storage_backend</span>: <span class="kw-2">&</span><span class="ident">Store</span>,
) -> <span class="prelude-ty">Result</span><span class="op"><</span>(<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">SessionKey</span><span class="op">></span>, <span class="ident">HashMap</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">String</span><span class="op">></span>), <span class="ident">actix_web::Error</span><span class="op">></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">session_key</span>) <span class="op">=</span> <span class="ident">session_key</span> {
<span class="kw">match</span> <span class="ident">storage_backend</span>.<span class="ident">load</span>(<span class="kw-2">&</span><span class="ident">session_key</span>).<span class="kw">await</span> {
<span class="prelude-val">Ok</span>(<span class="ident">state</span>) => {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">state</span>) <span class="op">=</span> <span class="ident">state</span> {
<span class="prelude-val">Ok</span>((<span class="prelude-val">Some</span>(<span class="ident">session_key</span>), <span class="ident">state</span>))
} <span class="kw">else</span> {
<span class="comment">// We discard the existing session key given that the state attached to it can</span>
<span class="comment">// no longer be found (e.g. it expired or we suffered some data loss in the</span>
<span class="comment">// storage). Regenerating the session key will trigger the `save` workflow</span>
<span class="comment">// instead of the `update` workflow if the session state is modified during the</span>
<span class="comment">// lifecycle of the current request.</span>
<span class="macro">tracing::info!</span>(
<span class="string">"No session state has been found for a valid session key, creating a new \
empty session."</span>
);
<span class="prelude-val">Ok</span>((<span class="prelude-val">None</span>, <span class="ident">HashMap::new</span>()))
}
}
<span class="prelude-val">Err</span>(<span class="ident">err</span>) => <span class="kw">match</span> <span class="ident">err</span> {
<span class="ident">LoadError::Deserialization</span>(<span class="ident">err</span>) => {
<span class="macro">tracing::warn!</span>(
<span class="ident">error</span>.<span class="ident">message</span> <span class="op">=</span> <span class="op">%</span><span class="ident">err</span>,
<span class="ident">error</span>.<span class="ident">cause_chain</span> <span class="op">=</span> <span class="question-mark">?</span><span class="ident">err</span>,
<span class="string">"Invalid session state, creating a new empty session."</span>
);
<span class="prelude-val">Ok</span>((<span class="prelude-val">Some</span>(<span class="ident">session_key</span>), <span class="ident">HashMap::new</span>()))
}
<span class="ident">LoadError::Other</span>(<span class="ident">err</span>) => <span class="prelude-val">Err</span>(<span class="ident">e500</span>(<span class="ident">err</span>)),
},
}
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>((<span class="prelude-val">None</span>, <span class="ident">HashMap::new</span>()))
}
}
<span class="kw">fn</span> <span class="ident">set_session_cookie</span>(
<span class="ident">response</span>: <span class="kw-2">&mut</span> <span class="ident">ResponseHead</span>,
<span class="ident">session_key</span>: <span class="ident">SessionKey</span>,
<span class="ident">config</span>: <span class="kw-2">&</span><span class="ident">CookieConfiguration</span>,
) -> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">anyhow::Error</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">value</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">session_key</span>.<span class="ident">into</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cookie</span> <span class="op">=</span> <span class="ident">Cookie::new</span>(<span class="ident">config</span>.<span class="ident">name</span>.<span class="ident">clone</span>(), <span class="ident">value</span>);
<span class="ident">cookie</span>.<span class="ident">set_secure</span>(<span class="ident">config</span>.<span class="ident">secure</span>);
<span class="ident">cookie</span>.<span class="ident">set_http_only</span>(<span class="ident">config</span>.<span class="ident">http_only</span>);
<span class="ident">cookie</span>.<span class="ident">set_same_site</span>(<span class="ident">config</span>.<span class="ident">same_site</span>);
<span class="ident">cookie</span>.<span class="ident">set_path</span>(<span class="ident">config</span>.<span class="ident">path</span>.<span class="ident">clone</span>());
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">max_age</span>) <span class="op">=</span> <span class="ident">config</span>.<span class="ident">max_age</span> {
<span class="ident">cookie</span>.<span class="ident">set_max_age</span>(<span class="ident">max_age</span>);
}
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">domain</span>) <span class="op">=</span> <span class="ident">config</span>.<span class="ident">domain</span> {
<span class="ident">cookie</span>.<span class="ident">set_domain</span>(<span class="ident">domain</span>.<span class="ident">clone</span>());
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">jar</span> <span class="op">=</span> <span class="ident">CookieJar::new</span>();
<span class="kw">match</span> <span class="ident">config</span>.<span class="ident">content_security</span> {
<span class="ident">CookieContentSecurity::Signed</span> => <span class="ident">jar</span>.<span class="ident">signed_mut</span>(<span class="kw-2">&</span><span class="ident">config</span>.<span class="ident">key</span>).<span class="ident">add</span>(<span class="ident">cookie</span>),
<span class="ident">CookieContentSecurity::Private</span> => <span class="ident">jar</span>.<span class="ident">private_mut</span>(<span class="kw-2">&</span><span class="ident">config</span>.<span class="ident">key</span>).<span class="ident">add</span>(<span class="ident">cookie</span>),
}
<span class="comment">// set cookie</span>
<span class="kw">let</span> <span class="ident">cookie</span> <span class="op">=</span> <span class="ident">jar</span>.<span class="ident">delta</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="ident">HeaderValue::from_str</span>(<span class="kw-2">&</span><span class="ident">cookie</span>.<span class="ident">encoded</span>().<span class="ident">to_string</span>())
.<span class="ident">context</span>(<span class="string">"Failed to attach a session cookie to the outgoing response"</span>)<span class="question-mark">?</span>;
<span class="ident">response</span>.<span class="ident">headers_mut</span>().<span class="ident">append</span>(<span class="ident">SET_COOKIE</span>, <span class="ident">val</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn</span> <span class="ident">delete_session_cookie</span>(
<span class="ident">response</span>: <span class="kw-2">&mut</span> <span class="ident">ResponseHead</span>,
<span class="ident">config</span>: <span class="kw-2">&</span><span class="ident">CookieConfiguration</span>,
) -> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">anyhow::Error</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">removal_cookie</span> <span class="op">=</span> <span class="ident">Cookie::build</span>(<span class="ident">config</span>.<span class="ident">name</span>.<span class="ident">clone</span>(), <span class="string">""</span>)
.<span class="ident">path</span>(<span class="ident">config</span>.<span class="ident">path</span>.<span class="ident">clone</span>())
.<span class="ident">http_only</span>(<span class="ident">config</span>.<span class="ident">http_only</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">removal_cookie</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">domain</span>) <span class="op">=</span> <span class="ident">config</span>.<span class="ident">domain</span> {
<span class="ident">removal_cookie</span>.<span class="ident">domain</span>(<span class="ident">domain</span>)
} <span class="kw">else</span> {
<span class="ident">removal_cookie</span>
}
.<span class="ident">finish</span>();
<span class="ident">removal_cookie</span>.<span class="ident">make_removal</span>();
<span class="kw">let</span> <span class="ident">val</span> <span class="op">=</span> <span class="ident">HeaderValue::from_str</span>(<span class="kw-2">&</span><span class="ident">removal_cookie</span>.<span class="ident">to_string</span>())
.<span class="ident">context</span>(<span class="string">"Failed to attach a session removal cookie to the outgoing response"</span>)<span class="question-mark">?</span>;
<span class="ident">response</span>.<span class="ident">headers_mut</span>().<span class="ident">append</span>(<span class="ident">SET_COOKIE</span>, <span class="ident">val</span>);
<span class="prelude-val">Ok</span>(())
}
</code></pre></div>
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