use the server startup time to drop old cached tickets

1 files changed, 13 insertions, 4 deletions

diff --git a/index.html b/index.html
index bb1b6ca..bcda425 100644
--- a/index.html
+++ b/index.html
@@ -80,7 +80,7 @@ button {
       function requestHelp() {
         new HttpClient().get("new", (myNumber) => {
           myTicket = myNumber;
-          localStorage.setItem("my-ticket", myTicket);
+          localStorage.setItem("my-ticket", JSON.stringify({"t": myTicket, "e": Date.now()}));
           showTicket();
         });
       }
@@ -119,9 +119,17 @@ button {
 
       var myTicket;
       function init() {
-	      myTicket = localStorage.getItem("my-ticket");
-	      if (myTicket)
-	        showTicket();
+	      const cached = JSON.parse(localStorage.getItem("my-ticket"));
+	      if (!cached) return;
+
+	      const serverEpoch = Date.parse(document.getElementById("epoch").textContent);
+	      if (cached.e < serverEpoch) {
+            localStorage.removeItem("my-ticket");
+            return;
+          }
+
+	      myTicket = cached.t;
+	      showTicket();
       }
 
       if (document.readyState === "loading") {
@@ -133,6 +141,7 @@ button {
     </script>
   </head>
   <body>
+    <div id="epoch" style="display: none;">{{.StartTime}}</div>
     <div id="next">
       Nächstes Hilfe Ticket
       <span id="done">{{.Done}}</span>