Start to implement OpenID authentication

remote_backend/src/extractors/auth_extractor.rs

@@ -0,0 +1,47 @@
+use actix_identity::Identity;
+use actix_web::dev::Payload;
+use actix_web::{Error, FromRequest, HttpMessage, HttpRequest};
+use futures_util::future::{ready, Ready};
+use std::fmt::Display;
+
+pub struct AuthExtractor {
+    identity: Option<Identity>,
+    request: HttpRequest,
+}
+
+impl AuthExtractor {
+    /// Check whether the user is authenticated or not
+    pub fn is_authenticated(&self) -> bool {
+        self.identity.is_some()
+    }
+
+    /// Authenticate the user
+    pub fn authenticate(&self, id: impl Display) {
+        Identity::login(&self.request.extensions(), id.to_string())
+            .expect("Unable to set authentication!");
+    }
+
+    pub fn id(&self) -> Option<String> {
+        self.identity.as_ref().map(|i| i.id().unwrap())
+    }
+
+    pub fn sign_out(self) {
+        if let Some(i) = self.identity {
+            i.logout()
+        }
+    }
+}
+
+impl FromRequest for AuthExtractor {
+    type Error = Error;
+    type Future = Ready<Result<Self, Error>>;
+
+    fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future {
+        let identity: Option<Identity> = Identity::from_request(req, payload).into_inner().ok();
+
+        ready(Ok(Self {
+            identity,
+            request: req.clone(),
+        }))
+    }
+}