1 files changed, 54 insertions, 0 deletions
diff --git a/components/jetpack/sdk/private-browsing/utils.js b/components/jetpack/sdk/private-browsing/utils.js
new file mode 100644
index 000000000..8b012f0ce
--- /dev/null
+++ b/components/jetpack/sdk/private-browsing/utils.js
@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { Cc, Ci, Cu } = require('chrome');
+const { is } = require('../system/xul-app');
+const { isWindowPrivate } = require('../window/utils');
+const { isPrivateBrowsingSupported } = require('../self');
+const { dispatcher } = require("../util/dispatcher");
+
+var PrivateBrowsingUtils;
+
+// Private browsing is only supported in Fx
+try {
+  PrivateBrowsingUtils = Cu.import('resource://gre/modules/PrivateBrowsingUtils.jsm', {}).PrivateBrowsingUtils;
+}
+catch (e) {}
+
+exports.isGlobalPBSupported = false;
+
+// checks that per-window private browsing is implemented
+var isWindowPBSupported = exports.isWindowPBSupported =
+                          !!PrivateBrowsingUtils && is('Firefox');
+
+// checks that per-tab private browsing is implemented
+var isTabPBSupported = exports.isTabPBSupported =
+                       !!PrivateBrowsingUtils && is('Fennec');
+
+function isPermanentPrivateBrowsing() {
+ return !!(PrivateBrowsingUtils && PrivateBrowsingUtils.permanentPrivateBrowsing);
+}
+exports.isPermanentPrivateBrowsing = isPermanentPrivateBrowsing;
+
+function ignoreWindow(window) {
+  return !isPrivateBrowsingSupported && isWindowPrivate(window);
+}
+exports.ignoreWindow = ignoreWindow;
+
+var getMode = function getMode(chromeWin) {
+  return (chromeWin !== undefined && isWindowPrivate(chromeWin));
+};
+exports.getMode = getMode;
+
+const isPrivate = dispatcher("isPrivate");
+isPrivate.when(isPermanentPrivateBrowsing, _ => true);
+isPrivate.when(x => x instanceof Ci.nsIDOMWindow, isWindowPrivate);
+isPrivate.when(x => Ci.nsIPrivateBrowsingChannel && x instanceof Ci.nsIPrivateBrowsingChannel, x => x.isChannelPrivate);
+isPrivate.define(() => false);
+exports.isPrivate = isPrivate;