new functions and js v=

static/js/session.js

@@ -40,6 +40,16 @@ export function setNickname(value) {
   setNicknameCookie(nickname);
 }
 
+const GUEST_ID_COOKIE = "rustpad_guest_id";
+export function getGuestId() {
+  let guestId = getCookie(GUEST_ID_COOKIE);
+  if (!/^[a-zA-Z0-9_-]{16,64}$/.test(guestId)) {
+    guestId = crypto.randomUUID().replaceAll("-", "");
+    document.cookie = `${GUEST_ID_COOKIE}=${guestId}; Path=/; SameSite=Lax`;
+  }
+  return guestId;
+}
+
 const AUTH_TOKEN_KEY = "rustpad:auth-token";
 // Account sessions must be shared by every tab on this origin. Keep a
 // compatibility fallback for sessions created by older frontend versions.