Merge pull request #912 from Dowwie/master

updated actix-session to support login and logout functionality

actix-session/CHANGES.md

@@ -1,5 +1,12 @@
 # Changes
 
+## [0.2.0] - 2019-07-03
+*  Enhanced ``actix-session`` to facilitate state changes.  Use ``Session.renew()``
+   at successful login to cycle a session (new key/cookie but keeps state).
+   Use ``Session.purge()`` at logout to invalid a session cookie (and remove 
+   from redis cache, if applicable).
+
+
 ## [0.1.1] - 2019-06-03
 
 * Fix optional cookie session support

actix-session/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "actix-session"
-version = "0.1.1"
+version = "0.2.0"
 authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
 description = "Session for actix web framework."
 readme = "README.md"

actix-session/src/cookie.rs

@@ -28,7 +28,7 @@ use futures::future::{ok, Future, FutureResult};
 use futures::Poll;
 use serde_json::error::Error as JsonError;
 
-use crate::Session;
+use crate::{Session, SessionStatus};
 
 /// Errors that can occur during handling cookie session
 #[derive(Debug, From, Display)]
@@ -119,7 +119,21 @@ impl CookieSessionInner {
         Ok(())
     }
 
-    fn load(&self, req: &ServiceRequest) -> HashMap<String, String> {
+    /// invalidates session cookie
+    fn remove_cookie<B>(&self, res: &mut ServiceResponse<B>)
+                    -> Result<(), Error> {
+        let mut cookie = Cookie::named(self.name.clone());
+        cookie.set_value("");
+        cookie.set_max_age(time::Duration::seconds(0));
+        cookie.set_expires(time::now() - time::Duration::days(365));
+
+        let val = HeaderValue::from_str(&cookie.to_string())?;
+        res.headers_mut().append(SET_COOKIE, val);
+
+        Ok(())
+    }
+
+    fn load(&self, req: &ServiceRequest) -> (bool, HashMap<String, String>) {
         if let Ok(cookies) = req.cookies() {
             for cookie in cookies.iter() {
                 if cookie.name() == self.name {
@@ -134,13 +148,13 @@ impl CookieSessionInner {
                     };
                     if let Some(cookie) = cookie_opt {
                         if let Ok(val) = serde_json::from_str(cookie.value()) {
-                            return val;
+                            return (false, val);
                         }
                     }
                 }
             }
         }
-        HashMap::new()
+        (true, HashMap::new())
     }
 }
 
@@ -302,16 +316,34 @@ where
         self.service.poll_ready()
     }
 
+    /// On first request, a new session cookie is returned in response, regardless
+    /// of whether any session state is set.  With subsequent requests, if the 
+    /// session state changes, then set-cookie is returned in response.  As
+    /// a user logs out, call session.purge() to set SessionStatus accordingly
+    /// and this will trigger removal of the session cookie in the response.
     fn call(&mut self, mut req: ServiceRequest) -> Self::Future {
         let inner = self.inner.clone();
-        let state = self.inner.load(&req);
+        let (is_new, state) = self.inner.load(&req);
         Session::set_session(state.into_iter(), &mut req);
 
         Box::new(self.service.call(req).map(move |mut res| {
-            if let Some(state) = Session::get_changes(&mut res) {
-                res.checked_expr(|res| inner.set_cookie(res, state))
-            } else {
-                res
+            match Session::get_changes(&mut res) {
+                (SessionStatus::Changed, Some(state))
+                 | (SessionStatus::Renewed, Some(state)) => 
+                    res.checked_expr(|res| inner.set_cookie(res, state)),
+                (SessionStatus::Unchanged, _) =>
+                    // set a new session cookie upon first request (new client)
+                    if is_new {
+                        let state: HashMap<String, String> = HashMap::new();
+                        res.checked_expr(|res| inner.set_cookie(res, state.into_iter()))
+                    } else {
+                        res
+                    },
+                (SessionStatus::Purged, _) => {
+				    inner.remove_cookie(&mut res);
+					res
+				},
+                _ => res
             }
         }))
     }

actix-session/src/lib.rs

@@ -98,10 +98,23 @@ impl UserSession for ServiceRequest {
     }
 }
 
+#[derive(PartialEq, Clone, Debug)]
+pub enum SessionStatus {
+    Changed,
+    Purged,
+    Renewed,
+    Unchanged
+}
+impl Default for SessionStatus {
+    fn default() -> SessionStatus {
+        SessionStatus::Unchanged
+    }
+}
+
 #[derive(Default)]
 struct SessionInner {
     state: HashMap<String, String>,
-    changed: bool,
+    pub status: SessionStatus,
 }
 
 impl Session {
@@ -117,25 +130,46 @@ impl Session {
     /// Set a `value` from the session.
     pub fn set<T: Serialize>(&self, key: &str, value: T) -> Result<(), Error> {
         let mut inner = self.0.borrow_mut();
-        inner.changed = true;
-        inner
-            .state
-            .insert(key.to_owned(), serde_json::to_string(&value)?);
+        if inner.status != SessionStatus::Purged {
+            inner.status = SessionStatus::Changed;
+            inner
+                .state
+                .insert(key.to_owned(), serde_json::to_string(&value)?);
+        }
         Ok(())
     }
 
     /// Remove value from the session.
     pub fn remove(&self, key: &str) {
         let mut inner = self.0.borrow_mut();
-        inner.changed = true;
-        inner.state.remove(key);
+        if inner.status != SessionStatus::Purged {
+            inner.status = SessionStatus::Changed;
+            inner.state.remove(key);
+        }
     }
 
     /// Clear the session.
     pub fn clear(&self) {
         let mut inner = self.0.borrow_mut();
-        inner.changed = true;
-        inner.state.clear()
+        if inner.status != SessionStatus::Purged {
+            inner.status = SessionStatus::Changed;
+            inner.state.clear()
+        }
+    }
+
+    /// Removes session, both client and server side.
+    pub fn purge(&self) {
+        let mut inner = self.0.borrow_mut();
+        inner.status = SessionStatus::Purged;
+        inner.state.clear();
+    }
+
+    /// Renews the session key, assigning existing session state to new key.
+    pub fn renew(&self) {
+        let mut inner = self.0.borrow_mut();
+        if inner.status != SessionStatus::Purged {
+            inner.status = SessionStatus::Renewed;
+        }
     }
 
     pub fn set_session(
@@ -149,7 +183,7 @@ impl Session {
 
     pub fn get_changes<B>(
         res: &mut ServiceResponse<B>,
-    ) -> Option<impl Iterator<Item = (String, String)>> {
+    ) -> (SessionStatus, Option<impl Iterator<Item = (String, String)>>) {
         if let Some(s_impl) = res
             .request()
             .extensions()
@@ -157,9 +191,9 @@ impl Session {
         {
             let state =
                 std::mem::replace(&mut s_impl.borrow_mut().state, HashMap::new());
-            Some(state.into_iter())
+            (s_impl.borrow().status.clone(), Some(state.into_iter()))
         } else {
-            None
+            (SessionStatus::Unchanged, None)
         }
     }
 
@@ -224,7 +258,8 @@ mod tests {
         session.remove("key");
 
         let mut res = req.into_response(HttpResponse::Ok().finish());
-        let changes: Vec<_> = Session::get_changes(&mut res).unwrap().collect();
+        let (_status, state) = Session::get_changes(&mut res);
+        let changes: Vec<_> = state.unwrap().collect();
         assert_eq!(changes, [("key2".to_string(), "\"value2\"".to_string())]);
     }
 
@@ -241,4 +276,23 @@ mod tests {
         let res = session.get::<String>("key").unwrap();
         assert_eq!(res, Some("value".to_string()));
     }
+
+    #[test]
+    fn purge_session() {
+        let mut req = test::TestRequest::default().to_srv_request();
+        let session = Session::get_session(&mut *req.extensions_mut());
+        assert_eq!(session.0.borrow().status, SessionStatus::Unchanged);
+        session.purge();
+        assert_eq!(session.0.borrow().status, SessionStatus::Purged);
+    }
+
+
+    #[test]
+    fn renew_session() {
+        let mut req = test::TestRequest::default().to_srv_request();
+        let session = Session::get_session(&mut *req.extensions_mut());
+        assert_eq!(session.0.borrow().status, SessionStatus::Unchanged);
+        session.renew();
+        assert_eq!(session.0.borrow().status, SessionStatus::Renewed);
+    }
 }