fix setup of new document, closes #966

src/public/app/services/protected_session_holder.js

@@ -0,0 +1,47 @@
+import utils from "./utils.js";
+import options from './options.js';
+
+const PROTECTED_SESSION_ID_KEY = 'protectedSessionId';
+
+let lastProtectedSessionOperationDate = 0;
+
+setInterval(() => {
+    const protectedSessionTimeout = options.getInt('protectedSessionTimeout');
+    if (lastProtectedSessionOperationDate
+        && Date.now() - lastProtectedSessionOperationDate > protectedSessionTimeout * 1000) {
+
+        resetProtectedSession();
+    }
+}, 5000);
+
+function setProtectedSessionId(id) {
+    // using session cookie so that it disappears after browser/tab is closed
+    utils.setSessionCookie(PROTECTED_SESSION_ID_KEY, id);
+}
+
+function resetProtectedSession() {
+    utils.setSessionCookie(PROTECTED_SESSION_ID_KEY, null);
+
+    // most secure solution - guarantees nothing remained in memory
+    // since this expires because user doesn't use the app, it shouldn't be disruptive
+    utils.reloadApp();
+}
+
+function isProtectedSessionAvailable() {
+    return !!utils.getCookie(PROTECTED_SESSION_ID_KEY);
+}
+
+function touchProtectedSession() {
+    if (isProtectedSessionAvailable()) {
+        lastProtectedSessionOperationDate = Date.now();
+
+        setProtectedSessionId(utils.getCookie(PROTECTED_SESSION_ID_KEY));
+    }
+}
+
+export default {
+    setProtectedSessionId,
+    resetProtectedSession,
+    isProtectedSessionAvailable,
+    touchProtectedSession
+};