import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

browser/components/sessionstore/PrivacyLevel.jsm

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+/* 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";
+
+this.EXPORTED_SYMBOLS = ["PrivacyLevel"];
+
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+const PREF = "browser.sessionstore.privacy_level";
+
+// The following constants represent the different possible privacy levels that
+// can be set by the user and that we need to consider when collecting text
+// data, and cookies.
+//
+// Collect data from all sites (http and https).
+const PRIVACY_NONE = 0;
+// Collect data from unencrypted sites (http), only.
+const PRIVACY_ENCRYPTED = 1;
+// Collect no data.
+const PRIVACY_FULL = 2;
+
+/**
+ * The external API as exposed by this module.
+ */
+var PrivacyLevel = Object.freeze({
+  /**
+   * Returns whether the current privacy level allows saving data for the given
+   * |url|.
+   *
+   * @param url The URL we want to save data for.
+   * @return bool
+   */
+  check: function (url) {
+    return PrivacyLevel.canSave({ isHttps: url.startsWith("https:") });
+  },
+
+  /**
+   * Checks whether we're allowed to save data for a specific site.
+   *
+   * @param {isHttps: boolean}
+   *        An object that must have one property: 'isHttps'.
+   *        'isHttps' tells whether the site us secure communication (HTTPS).
+   * @return {bool} Whether we can save data for the specified site.
+   */
+  canSave: function ({isHttps}) {
+    let level = Services.prefs.getIntPref(PREF);
+
+    // Never save any data when full privacy is requested.
+    if (level == PRIVACY_FULL) {
+      return false;
+    }
+
+    // Don't save data for encrypted sites when requested.
+    if (isHttps && level == PRIVACY_ENCRYPTED) {
+      return false;
+    }
+
+    return true;
+  }
+});