auto-logout.clj

(defn start-autologout-monitoring []
  (let [activity-ch (async/chan)]
    (.ready
     ($ js/document)
     (fn []
       (this-as
        this
        (.mousemove ($ this) (fn [_] (go (>! activity-ch true))))
        (.keypress ($ this) (fn [_] (go (>! activity-ch true))))
        (go
          (loop []
            (let [[v p] (async/alts! [(async/timeout 5000) activity-ch])]
              (if v (recur))))
          (.open js/window "/logout")))))))

auto-logout.js

// source: http://stackoverflow.com/questions/667555/detecting-idle-time-in-javascript-elegantly

var idleTime = 0;
$(document).ready(function () {
    //Increment the idle time counter every minute.
    var idleInterval = setInterval(timerIncrement, 60000); // 1 minute

    //Zero the idle timer on mouse movement.
    $(this).mousemove(function (e) {
        idleTime = 0;
    });
    $(this).keypress(function (e) {
        idleTime = 0;
    });
});

function timerIncrement() {
    idleTime = idleTime + 1;
    if (idleTime > 19) { // 20 minutes
        window.location.reload();
    }
}