Public method to check if sleeping is allowed (#674)

libraries/opensk/src/ctap/client_pin.rs

@@ -140,6 +140,12 @@ impl<E: Env> ClientPin<E> {
         }
     }
 
+    /// Checks if a PIN UV token is in use.
+    pub fn has_token(&mut self, env: &mut E) -> bool {
+        self.update_timeouts(env);
+        self.pin_uv_auth_token_state.is_in_use()
+    }
+
     /// Gets a reference to the PIN protocol of the given version.
     fn get_pin_protocol(&self, pin_uv_auth_protocol: PinUvAuthProtocol) -> &PinProtocol<E> {
         match pin_uv_auth_protocol {
@@ -1507,9 +1513,11 @@ mod test {
         let mut env = TestEnv::default();
         let mut client_pin = ClientPin::<TestEnv>::new(&mut env);
         let message = [0xAA];
+        assert!(!client_pin.has_token(&mut env));
         client_pin
             .pin_uv_auth_token_state
             .begin_using_pin_uv_auth_token(&mut env);
+        assert!(client_pin.has_token(&mut env));
 
         let pin_uv_auth_token_v1 = client_pin
             .get_pin_protocol(PinUvAuthProtocol::V1)
@@ -1655,6 +1663,7 @@ mod test {
                 .has_permissions_rp_id("example.com"),
             Ok(())
         );
+        assert!(client_pin.has_token(&mut env));
 
         env.clock().advance(30001);
         client_pin.update_timeouts(&mut env);
@@ -1672,6 +1681,7 @@ mod test {
                 .has_permissions_rp_id("example.com"),
             Err(Ctap2StatusCode::CTAP2_ERR_PIN_AUTH_INVALID)
         );
+        assert!(!client_pin.has_token(&mut env));
     }
 
     #[test]

libraries/opensk/src/ctap/mod.rs

@@ -602,6 +602,12 @@ impl<E: Env> CtapState<E> {
         self.stateful_command_permission.clear_old_channels(channel);
     }
 
+    /// Checks if the application has any timers running.
+    pub fn can_sleep(&mut self, env: &mut E) -> bool {
+        !self.client_pin.has_token(env)
+            && self.stateful_command_permission.get_command(env).is_err()
+    }
+
     pub fn process_command(
         &mut self,
         env: &mut E,

libraries/opensk/src/lib.rs

@@ -116,6 +116,10 @@ impl<E: Env> Ctap<E> {
         self.hid.should_wink(&mut self.env)
     }
 
+    pub fn can_sleep(&mut self) -> bool {
+        !self.should_wink() && self.state.can_sleep(&mut self.env)
+    }
+
     #[cfg(feature = "with_ctap1")]
     pub fn u2f_grant_user_presence(&mut self) {
         self.state.u2f_grant_user_presence(&mut self.env)
@@ -201,6 +205,7 @@ mod test {
     fn test_hard_reset() {
         let env = TestEnv::default();
         let mut ctap = Ctap::<TestEnv>::new(env);
+        assert!(!ctap.can_sleep());
 
         // Send Init, receive Init response.
         let mut init_response = ctap.process_hid_packet(&init_packet(), Transport::MainHid);
@@ -223,6 +228,7 @@ mod test {
         let mut env = TestEnv::default();
         env.set_boots_after_soft_reset(true);
         let mut ctap = Ctap::<TestEnv>::new(env);
+        assert!(ctap.can_sleep());
 
         // Send Init, receive Init response.
         let mut init_response = ctap.process_hid_packet(&init_packet(), Transport::MainHid);