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</pre><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, 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>Unchanged,
}
<span class="kw">impl </span>Default <span class="kw">for </span>SessionStatus {
<span class="kw">fn </span>default() -> SessionStatus {
SessionStatus::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="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="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">"{}"</span>, _0)]
</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">"{}"</span>, _0)]
</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>
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