add card expiry checks

amnet-server/src/card.rs

@@ -1,5 +1,7 @@
 use std::{sync::{Mutex, OnceLock}, time::{Duration, Instant}};
 
+use tracing::debug;
+
 use crate::utils::{parse_access_code, parse_idm_hex};
 
 #[derive(Debug, Clone)]
@@ -52,7 +54,13 @@ impl CardPresenter {
             }
         }
 
-        guard.take()
+        let card = guard.take();
+        if let Some(ref stored_card) = card && stored_card.is_expired() {
+            debug!("Stored card has expired and will not be provided");
+            return None;
+        };
+
+        card
     }
 
     pub fn present_card(&self, access_code: &String, idm_hex: Option<&String>, validity: Duration) -> CardPresentResult {