Refactor users management (#6)

* Use asynchronous interface to set authorized clients list

src/data/user.rs

@@ -11,6 +11,23 @@ use crate::utils::time::{fmt_time, time};
 #[derive(Clone, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
 pub struct UserID(pub String);
 
+#[derive(Eq, PartialEq, Clone, Debug)]
+pub enum GrantedClients {
+    AllClients,
+    SomeClients(Vec<ClientID>),
+    NoClient,
+}
+
+impl GrantedClients {
+    pub fn to_user(self) -> Option<Vec<ClientID>> {
+        match self {
+            GrantedClients::AllClients => None,
+            GrantedClients::SomeClients(users) => Some(users),
+            GrantedClients::NoClient => Some(vec![]),
+        }
+    }
+}
+
 #[derive(Clone, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
 pub struct FactorID(pub String);
 
@@ -124,10 +141,19 @@ impl User {
         )
     }
 
+    pub fn granted_clients(&self) -> GrantedClients {
+        match self.authorized_clients.as_deref() {
+            None => GrantedClients::AllClients,
+            Some(&[]) => GrantedClients::NoClient,
+            Some(clients) => GrantedClients::SomeClients(clients.to_vec()),
+        }
+    }
+
     pub fn can_access_app(&self, id: &ClientID) -> bool {
-        match &self.authorized_clients {
-            None => true,
-            Some(c) => c.contains(id),
+        match self.granted_clients() {
+            GrantedClients::AllClients => true,
+            GrantedClients::SomeClients(c) => c.contains(id),
+            GrantedClients::NoClient => false,
         }
     }