feat: sugar functions for valid time

src/data_types.rs

@@ -52,6 +52,20 @@ pub struct Keystore {
     pub refresh_expires: Instant,
 }
 
+impl Keystore {
+    /// The amount of time the access token is valid for. A duration of zero means expired.
+    pub fn access_token_valid_for(&self) -> Duration {
+        self.access_expires
+            .saturating_duration_since(instant::Instant::now())
+    }
+
+    /// The amount of time the refresh token is valid for. A duration of zero means expired.
+    pub fn refresh_token_valid_for(&self) -> Duration {
+        self.refresh_expires
+            .saturating_duration_since(instant::Instant::now())
+    }
+}
+
 #[derive(Resource, Debug, Clone)]
 pub struct KeyRotationSettings {
     /// The amount of time before the rotation attempt times out