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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) -> actix_web::Result<&'static str> { /// // access session data /// if let Some(count) = session.get::<i32>("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<RefCell<SessionInner>>); <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<String, String>, 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<T: DeserializeOwned>(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><T>, SessionGetError> { <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::<T>() ) }) .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">&</span><span class="self">self</span>) -> Ref<<span class="lifetime">'_</span>, HashMap<String, String>> { Ref::map(<span class="self">self</span>.<span class="number">0</span>.borrow(), |inner| <span class="kw-2">&</span>inner.state) } <span class="doccomment">/// Returns session status. </span><span class="kw">pub fn </span>status(<span class="kw-2">&</span><span class="self">self</span>) -> SessionStatus { Ref::map(<span class="self">self</span>.<span class="number">0</span>.borrow(), |inner| <span class="kw-2">&</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<T: Serialize>( <span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw">impl </span>Into<String>, value: T, ) -> <span class="prelude-ty">Result</span><(), SessionInsertError> { <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">&</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::<T>(), <span class="kw-2">&</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">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><String> { <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<T: DeserializeOwned>(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><T, String>> { <span class="self">self</span>.remove(key) .map(|val_str| <span class="kw">match </span>serde_json::from_str(<span class="kw-2">&</span>val_str) { <span class="prelude-val">Ok</span>(val) => <span class="prelude-val">Ok</span>(val), <span class="prelude-val">Err</span>(_err) => { <span class="macro">tracing::debug!</span>( <span class="string">"Removed value (key: {}) could not be deserialized as {}"</span>, key, std::any::type_name::<T>() ); <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">&</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">&</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">&</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">&mut </span>ServiceRequest, data: <span class="kw">impl </span>IntoIterator<Item = (String, String)>, ) { <span class="kw">let </span>session = Session::get_session(<span class="kw-2">&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<B>( res: <span class="kw-2">&mut </span>ServiceResponse<B>, ) -> (SessionStatus, HashMap<String, String>) { <span class="kw">if let </span><span class="prelude-val">Some</span>(s_impl) = res .request() .extensions() .get::<Rc<RefCell<SessionInner>>>() { <span class="kw">let </span>state = mem::take(<span class="kw-2">&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">&mut </span>Extensions) -> Session { <span class="kw">if let </span><span class="prelude-val">Some</span>(s_impl) = extensions.get::<Rc<RefCell<SessionInner>>>() { <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) -> Result<impl Responder> { /// // access session data /// if let Some(count) = session.get::<i32>("counter")? { /// session.insert("counter", count + 1)?; /// } else { /// session.insert("counter", 1)?; /// } /// /// let count = session.get::<i32>("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<<span class="prelude-ty">Result</span><Session, Error>>; <span class="attr">#[inline] </span><span class="kw">fn </span>from_request(req: <span class="kw-2">&</span>HttpRequest, <span class="kw">_</span>: <span class="kw-2">&mut </span>Payload) -> <span class="self">Self</span>::Future { ready(<span class="prelude-val">Ok</span>(Session::get_session(<span class="kw-2">&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">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>(<span class="kw">dyn </span>StdError + <span class="lifetime">'static</span>)> { <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">&</span><span class="self">self</span>) -> HttpResponse<BoxBody> { 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">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>(<span class="kw">dyn </span>StdError + <span class="lifetime">'static</span>)> { <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">&</span><span class="self">self</span>) -> HttpResponse<BoxBody> { HttpResponse::new(<span class="self">self</span>.status_code()) } } </code></pre></div></section></main></body></html>