The Tor Browser: dom/datastore/DataStoreServiceInternal.jsm@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 "use strict"

     7 const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;

     9 this.EXPORTED_SYMBOLS = ["DataStoreServiceInternal"];

    11 function debug(s) {

    12   //dump('DEBUG DataStoreServiceInternal: ' + s + '\n');

    13 }

    15 Cu.import("resource://gre/modules/XPCOMUtils.jsm");

    16 Cu.import("resource://gre/modules/Services.jsm");

    18 XPCOMUtils.defineLazyServiceGetter(this, "ppmm",

    19                                    "@mozilla.org/parentprocessmessagemanager;1",

    20                                    "nsIMessageBroadcaster");

    22 XPCOMUtils.defineLazyServiceGetter(this, "dataStoreService",

    23                                    "@mozilla.org/datastore-service;1",

    24                                    "nsIDataStoreService");

    26 this.DataStoreServiceInternal = {

    27   init: function() {

    28     debug("init");

    30     let inParent = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULRuntime)

    31                       .processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;

    32     if (inParent) {

    33       ppmm.addMessageListener("DataStore:Get", this);

    34     }

    35   },

    37   receiveMessage: function(aMessage) {

    38     debug("receiveMessage");

    40     if (aMessage.name != 'DataStore:Get') {

    41       return;

    42     }

    44     let prefName = 'dom.testing.datastore_enabled_for_hosted_apps';

    45     if ((Services.prefs.getPrefType(prefName) == Services.prefs.PREF_INVALID ||

    46          !Services.prefs.getBoolPref(prefName)) &&

    47         !aMessage.target.assertAppHasStatus(Ci.nsIPrincipal.APP_STATUS_CERTIFIED)) {

    48       return;

    49     }

    51     let msg = aMessage.data;

    53     if (!aMessage.principal ||

    54         aMessage.principal.appId == Ci.nsIScriptSecurityManager.UNKNOWN_APP_ID) {

    55       aMessage.target.sendAsyncMessage("DataStore:Get:Return:KO");

    56       return;

    57     }

    59     msg.stores = dataStoreService.getDataStoresInfo(msg.name, aMessage.principal.appId);

    60     if (msg.stores === null) {

    61       aMessage.target.sendAsyncMessage("DataStore:Get:Return:KO");

    62       return;

    63     }

    64     aMessage.target.sendAsyncMessage("DataStore:Get:Return:OK", msg);

    65   }

    66 }

    68 DataStoreServiceInternal.init();

The Tor Browser / file revision

dom/datastore/DataStoreServiceInternal.jsm@97036ab72558

dom/datastore/DataStoreServiceInternal.jsm