Prevent flashing lifespan warning

Previously, the lifespan warning would flash on a user's screen
every time they clicked a link, because that would result in an
API call to get updated session info. Added a check to prevent
that from happening.

x-pack/plugins/security/public/session/session_timeout.test.tsx

@@ -157,7 +157,7 @@ describe('Session Timeout', () => {
  test(`shows lifespan warning toast`, async () => {
  const sessionInfo = {
  now,
- idleTimeoutExpiration: now + 2 * 60 * 1000,
+ idleTimeoutExpiration: null,
  lifespanExpiration: now + 2 * 60 * 1000,
  };
  http.fetch.mockResolvedValue(sessionInfo);
@@ -183,15 +183,28 @@ describe('Session Timeout', () => {
  jest.advanceTimersByTime(10 * 1000);
  expectIdleTimeoutWarningToast(notifications);
 
- http.fetch.mockResolvedValue({
- now: now + 55 * 1000,
- idleTimeoutExpiration: now + 55 * 1000 + 2 * 60 * 1000,
- lifespanExpiration: null,
- });
  await sessionTimeout.extend('/foo');
  expect(http.fetch).toHaveBeenCalledTimes(3);
  });
 
+ test(`extend does not result in an HTTP call if a lifespan warning is shown`, async () => {
+ const sessionInfo = {
+ now,
+ idleTimeoutExpiration: null,
+ lifespanExpiration: now + 2 * 60 * 1000,
+ };
+ http.fetch.mockResolvedValue(sessionInfo);
+ await sessionTimeout.init();
+
+ // we display the warning a minute before we expire the the session, which is 5 seconds before it actually expires
+ jest.advanceTimersByTime(55 * 1000);
+ expectLifespanWarningToast(notifications);
+
+ expect(http.fetch).toHaveBeenCalledTimes(1);
+ await sessionTimeout.extend('/foo');
+ expect(http.fetch).toHaveBeenCalledTimes(1);
+ });
+
  test(`extend hides displayed warning toast`, async () => {
  await sessionTimeout.init();
  expect(http.fetch).toHaveBeenCalledTimes(1);

x-pack/plugins/security/public/session/session_timeout.tsx

@@ -84,8 +84,9 @@ export class SessionTimeout {
  return;
  }
 
- if (this.warningToast) {
- // the warning is currently showing and the user has clicked elsewhere on the page;
+ const { isMaximum } = this.getTimeout();
+ if (this.warningToast && !isMaximum) {
+ // the idle timeout warning is currently showing and the user has clicked elsewhere on the page;
  // make a new call to get the latest session info
  return this.fetchSessionInfoAndResetTimers();
  }