The Tor Browser: dom/apps/src/Webapps.jsm@7e26c7da4463 (annotated)

dom/apps/src/Webapps.jsm@7e26c7da4463 (annotated)

dom/apps/src/Webapps.jsm

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rwxr-xr-x

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* 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";
 const Cu = Components.utils;
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cr = Components.results;
 // Possible errors thrown by the signature verifier.
 const SEC_ERROR_BASE = Ci.nsINSSErrorsService.NSS_SEC_ERROR_BASE;
 const SEC_ERROR_EXPIRED_CERTIFICATE = (SEC_ERROR_BASE + 11);
 // We need this to decide if we should accept or not files signed with expired
 // certificates.
 function buildIDToTime() {
   let platformBuildID =
     Cc["@mozilla.org/xre/app-info;1"]
       .getService(Ci.nsIXULAppInfo).platformBuildID;
   let platformBuildIDDate = new Date();
   platformBuildIDDate.setUTCFullYear(platformBuildID.substr(0,4),
                                       platformBuildID.substr(4,2) - 1,
                                       platformBuildID.substr(6,2));
   platformBuildIDDate.setUTCHours(platformBuildID.substr(8,2),
                                   platformBuildID.substr(10,2),
                                   platformBuildID.substr(12,2));
   return platformBuildIDDate.getTime();
 }
 const PLATFORM_BUILD_ID_TIME = buildIDToTime();
 this.EXPORTED_SYMBOLS = ["DOMApplicationRegistry"];
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/FileUtils.jsm");
 Cu.import('resource://gre/modules/ActivitiesService.jsm');
 Cu.import("resource://gre/modules/AppsUtils.jsm");
 Cu.import("resource://gre/modules/AppDownloadManager.jsm");
 Cu.import("resource://gre/modules/osfile.jsm");
 Cu.import("resource://gre/modules/Task.jsm");
 Cu.import("resource://gre/modules/Promise.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "TrustedRootCertificate",
   "resource://gre/modules/StoreTrustAnchor.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "PermissionsInstaller",
   "resource://gre/modules/PermissionsInstaller.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "OfflineCacheInstaller",
   "resource://gre/modules/OfflineCacheInstaller.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "SystemMessagePermissionsChecker",
   "resource://gre/modules/SystemMessagePermissionsChecker.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "WebappOSUtils",
   "resource://gre/modules/WebappOSUtils.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
   "resource://gre/modules/NetUtil.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "ScriptPreloader",
                                   "resource://gre/modules/ScriptPreloader.jsm");
 #ifdef MOZ_WIDGET_GONK
 XPCOMUtils.defineLazyGetter(this, "libcutils", function() {
   Cu.import("resource://gre/modules/systemlibs.js");
   return libcutils;
 });
 #endif
 function debug(aMsg) {
 #ifdef DEBUG
   dump("-*- Webapps.jsm : " + aMsg + "\n");
 #endif
 }
 function getNSPRErrorCode(err) {
   return -1 * ((err) & 0xffff);
 }
 function supportUseCurrentProfile() {
   return Services.prefs.getBoolPref("dom.webapps.useCurrentProfile");
 }
 function supportSystemMessages() {
   return Services.prefs.getBoolPref("dom.sysmsg.enabled");
 }
 // Minimum delay between two progress events while downloading, in ms.
 const MIN_PROGRESS_EVENT_DELAY = 1500;
 const WEBAPP_RUNTIME = Services.appinfo.ID == "webapprt@mozilla.org";
 const chromeWindowType = WEBAPP_RUNTIME ? "webapprt:webapp" : "navigator:browser";
 XPCOMUtils.defineLazyServiceGetter(this, "ppmm",
                                    "@mozilla.org/parentprocessmessagemanager;1",
                                    "nsIMessageBroadcaster");
 XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
                                    "@mozilla.org/childprocessmessagemanager;1",
                                    "nsIMessageSender");
 XPCOMUtils.defineLazyGetter(this, "interAppCommService", function() {
   return Cc["@mozilla.org/inter-app-communication-service;1"]
          .getService(Ci.nsIInterAppCommService);
 });
 XPCOMUtils.defineLazyServiceGetter(this, "dataStoreService",
                                    "@mozilla.org/datastore-service;1",
                                    "nsIDataStoreService");
 XPCOMUtils.defineLazyGetter(this, "msgmgr", function() {
   return Cc["@mozilla.org/system-message-internal;1"]
          .getService(Ci.nsISystemMessagesInternal);
 });
 XPCOMUtils.defineLazyGetter(this, "updateSvc", function() {
   return Cc["@mozilla.org/offlinecacheupdate-service;1"]
            .getService(Ci.nsIOfflineCacheUpdateService);
 });
 #ifdef MOZ_WIDGET_GONK
   const DIRECTORY_NAME = "webappsDir";
 #elifdef ANDROID
   const DIRECTORY_NAME = "webappsDir";
 #else
   // If we're executing in the context of the webapp runtime, the data files
   // are in a different directory (currently the Firefox profile that installed
   // the webapp); otherwise, they're in the current profile.
   const DIRECTORY_NAME = WEBAPP_RUNTIME ? "WebappRegD" : "ProfD";
 #endif
 // We'll use this to identify privileged apps that have been preinstalled
 // For those apps we'll set
 // STORE_ID_PENDING_PREFIX + installOrigin
 // as the storeID. This ensures it's unique and can't be set from a legit
 // store even by error.
 const STORE_ID_PENDING_PREFIX = "#unknownID#";
 this.DOMApplicationRegistry = {
   // Path to the webapps.json file where we store the registry data.
   appsFile: null,
   webapps: { },
   children: [ ],
   allAppsLaunchable: false,
   _updateHandlers: [ ],
   init: function() {
     this.messages = ["Webapps:Install", "Webapps:Uninstall",
                      "Webapps:GetSelf", "Webapps:CheckInstalled",
                      "Webapps:GetInstalled", "Webapps:GetNotInstalled",
                      "Webapps:Launch", "Webapps:GetAll",
                      "Webapps:InstallPackage",
                      "Webapps:GetList", "Webapps:RegisterForMessages",
                      "Webapps:UnregisterForMessages",
                      "Webapps:CancelDownload", "Webapps:CheckForUpdate",
                      "Webapps:Download", "Webapps:ApplyDownload",
                      "Webapps:Install:Return:Ack", "Webapps:AddReceipt",
                      "Webapps:RemoveReceipt", "Webapps:ReplaceReceipt",
                      "child-process-shutdown"];
     this.frameMessages = ["Webapps:ClearBrowserData"];
     this.messages.forEach((function(msgName) {
       ppmm.addMessageListener(msgName, this);
     }).bind(this));
     cpmm.addMessageListener("Activities:Register:OK", this);
     Services.obs.addObserver(this, "xpcom-shutdown", false);
     Services.obs.addObserver(this, "memory-pressure", false);
     AppDownloadManager.registerCancelFunction(this.cancelDownload.bind(this));
     this.appsFile = FileUtils.getFile(DIRECTORY_NAME,
                                       ["webapps", "webapps.json"], true).path;
     this.loadAndUpdateApps();
   },
   // loads the current registry, that could be empty on first run.
   loadCurrentRegistry: function() {
     return AppsUtils.loadJSONAsync(this.appsFile).then((aData) => {
       if (!aData) {
         return;
       }
       this.webapps = aData;
       let appDir = OS.Path.dirname(this.appsFile);
       for (let id in this.webapps) {
         let app = this.webapps[id];
         if (!app) {
           delete this.webapps[id];
           continue;
         }
         app.id = id;
         // Make sure we have a localId
         if (app.localId === undefined) {
           app.localId = this._nextLocalId();
         }
         if (app.basePath === undefined) {
           app.basePath = appDir;
         }
         // Default to removable apps.
         if (app.removable === undefined) {
           app.removable = true;
         }
         // Default to a non privileged status.
         if (app.appStatus === undefined) {
           app.appStatus = Ci.nsIPrincipal.APP_STATUS_INSTALLED;
         }
         // Default to NO_APP_ID and not in browser.
         if (app.installerAppId === undefined) {
           app.installerAppId = Ci.nsIScriptSecurityManager.NO_APP_ID;
         }
         if (app.installerIsBrowser === undefined) {
           app.installerIsBrowser = false;
         }
         // Default installState to "installed", and reset if we shutdown
         // during an update.
         if (app.installState === undefined ||
             app.installState === "updating") {
           app.installState = "installed";
         }
         // Default storeId to "" and storeVersion to 0
         if (this.webapps[id].storeId === undefined) {
           this.webapps[id].storeId = "";
         }
         if (this.webapps[id].storeVersion === undefined) {
           this.webapps[id].storeVersion = 0;
         }
         // Default role to "".
         if (this.webapps[id].role === undefined) {
           this.webapps[id].role = "";
         }
         // At startup we can't be downloading, and the $TMP directory
         // will be empty so we can't just apply a staged update.
         app.downloading = false;
         app.readyToApplyDownload = false;
       }
     });
   },
   // Notify we are starting with registering apps.
   _registryStarted: Promise.defer(),
   notifyAppsRegistryStart: function notifyAppsRegistryStart() {
     Services.obs.notifyObservers(this, "webapps-registry-start", null);
     this._registryStarted.resolve();
   },
   get registryStarted() {
     return this._registryStarted.promise;
   },
   // Notify we are done with registering apps and save a copy of the registry.
   _registryReady: Promise.defer(),
   notifyAppsRegistryReady: function notifyAppsRegistryReady() {
     this._registryReady.resolve();
     Services.obs.notifyObservers(this, "webapps-registry-ready", null);
     this._saveApps();
   },
   get registryReady() {
     return this._registryReady.promise;
   },
   // Ensure that the .to property in redirects is a relative URL.
   sanitizeRedirects: function sanitizeRedirects(aSource) {
     if (!aSource) {
       return null;
     }
     let res = [];
     for (let i = 0; i < aSource.length; i++) {
       let redirect = aSource[i];
       if (redirect.from && redirect.to &&
           isAbsoluteURI(redirect.from) &&
           !isAbsoluteURI(redirect.to)) {
         res.push(redirect);
       }
     }
     return res.length > 0 ? res : null;
   },
   // Registers all the activities and system messages.
   registerAppsHandlers: function(aRunUpdate) {
     this.notifyAppsRegistryStart();
     let ids = [];
     for (let id in this.webapps) {
       ids.push({ id: id });
     }
     if (supportSystemMessages()) {
       this._processManifestForIds(ids, aRunUpdate);
     } else {
       // Read the CSPs and roles. If MOZ_SYS_MSG is defined this is done on
       // _processManifestForIds so as to not reading the manifests
       // twice
       this._readManifests(ids).then((aResults) => {
         aResults.forEach((aResult) => {
           if (!aResult.manifest) {
             // If we can't load the manifest, we probably have a corrupted
             // registry. We delete the app since we can't do anything with it.
             delete this.webapps[aResult.id];
             return;
           }
           let app = this.webapps[aResult.id];
           app.csp = aResult.manifest.csp || "";
           app.role = aResult.manifest.role || "";
           if (app.appStatus >= Ci.nsIPrincipal.APP_STATUS_PRIVILEGED) {
             app.redirects = this.sanitizeRedirects(aResult.redirects);
           }
         });
       });
       // Nothing else to do but notifying we're ready.
       this.notifyAppsRegistryReady();
     }
   },
   updateDataStoreForApp: function(aId) {
     if (!this.webapps[aId]) {
       return;
     }
     // Create or Update the DataStore for this app
     this._readManifests([{ id: aId }]).then((aResult) => {
       let app = this.webapps[aId];
       this.updateDataStore(app.localId, app.origin, app.manifestURL,
                            aResult[0].manifest, app.appStatus);
     });
   },
   updatePermissionsForApp: function(aId) {
     if (!this.webapps[aId]) {
       return;
     }
     // Install the permissions for this app, as if we were updating
     // to cleanup the old ones if needed.
     // TODO It's not clear what this should do when there are multiple profiles.
     if (supportUseCurrentProfile()) {
       this._readManifests([{ id: aId }]).then((aResult) => {
         let data = aResult[0];
         PermissionsInstaller.installPermissions({
           manifest: data.manifest,
           manifestURL: this.webapps[aId].manifestURL,
           origin: this.webapps[aId].origin
         }, true, function() {
           debug("Error installing permissions for " + aId);
         });
       });
     }
   },
   updateOfflineCacheForApp: function(aId) {
     let app = this.webapps[aId];
     this._readManifests([{ id: aId }]).then((aResult) => {
       let manifest = new ManifestHelper(aResult[0].manifest, app.origin);
       OfflineCacheInstaller.installCache({
         cachePath: app.cachePath,
         appId: aId,
         origin: Services.io.newURI(app.origin, null, null),
         localId: app.localId,
         appcache_path: manifest.fullAppcachePath()
       });
     });
   },
   // Installs a 3rd party app.
   installPreinstalledApp: function installPreinstalledApp(aId) {
 #ifdef MOZ_WIDGET_GONK
     let app = this.webapps[aId];
     let baseDir;
     try {
       baseDir = FileUtils.getDir("coreAppsDir", ["webapps", aId], false);
       if (!baseDir.exists()) {
         return;
       } else if (!baseDir.directoryEntries.hasMoreElements()) {
         debug("Error: Core app in " + baseDir.path + " is empty");
         return;
       }
     } catch(e) {
       // In ENG builds, we don't have apps in coreAppsDir.
       return;
     }
     let filesToMove;
     let isPackage;
     let updateFile = baseDir.clone();
     updateFile.append("update.webapp");
     if (!updateFile.exists()) {
       // The update manifest is missing, this is a hosted app only if there is
       // no application.zip
       let appFile = baseDir.clone();
       appFile.append("application.zip");
       if (appFile.exists()) {
         return;
       }
       isPackage = false;
       filesToMove = ["manifest.webapp"];
     } else {
       isPackage = true;
       filesToMove = ["application.zip", "update.webapp"];
     }
     debug("Installing 3rd party app : " + aId +
           " from " + baseDir.path);
     // We copy this app to DIRECTORY_NAME/$aId, and set the base path as needed.
     let destDir = FileUtils.getDir(DIRECTORY_NAME, ["webapps", aId], true, true);
     filesToMove.forEach(function(aFile) {
         let file = baseDir.clone();
         file.append(aFile);
         try {
           file.copyTo(destDir, aFile);
         } catch(e) {
           debug("Error: Failed to copy " + file.path + " to " + destDir.path);
         }
       });
     app.installState = "installed";
     app.cachePath = app.basePath;
     app.basePath = OS.Path.dirname(this.appsFile);
     if (!isPackage) {
       return;
     }
     app.origin = "app://" + aId;
     // Do this for all preinstalled apps... we can't know at this
     // point if the updates will be signed or not and it doesn't
     // hurt to have it always.
     app.storeId = STORE_ID_PENDING_PREFIX + app.installOrigin;
     // Extract the manifest.webapp file from application.zip.
     let zipFile = baseDir.clone();
     zipFile.append("application.zip");
     let zipReader = Cc["@mozilla.org/libjar/zip-reader;1"]
                       .createInstance(Ci.nsIZipReader);
     try {
       debug("Opening " + zipFile.path);
       zipReader.open(zipFile);
       if (!zipReader.hasEntry("manifest.webapp")) {
         throw "MISSING_MANIFEST";
       }
       let manifestFile = destDir.clone();
       manifestFile.append("manifest.webapp");
       zipReader.extract("manifest.webapp", manifestFile);
     } catch(e) {
       // If we are unable to extract the manifest, cleanup and remove this app.
       debug("Cleaning up: " + e);
       destDir.remove(true);
       delete this.webapps[aId];
     } finally {
       zipReader.close();
     }
 #endif
   },
   // For hosted apps, uninstall an app served from http:// if we have
   // one installed from the same url with an https:// scheme.
   removeIfHttpsDuplicate: function(aId) {
 #ifdef MOZ_WIDGET_GONK
     let app = this.webapps[aId];
     if (!app || !app.origin.startsWith("http://")) {
       return;
     }
     let httpsManifestURL =
       "https://" + app.manifestURL.substring("http://".length);
     // This will uninstall the http apps and remove any data hold by this
     // app. Bug 948105 tracks data migration from http to https apps.
     for (let id in this.webapps) {
        if (this.webapps[id].manifestURL === httpsManifestURL) {
          debug("Found a http/https match: " + app.manifestURL + " / " +
                this.webapps[id].manifestURL);
          this.uninstall(app.manifestURL, function() {}, function() {});
          return;
        }
     }
 #endif
   },
   // Implements the core of bug 787439
   // if at first run, go through these steps:
   //   a. load the core apps registry.
   //   b. uninstall any core app from the current registry but not in the
   //      new core apps registry.
   //   c. for all apps in the new core registry, install them if they are not
   //      yet in the current registry, and run installPermissions()
   installSystemApps: function() {
     return Task.spawn(function() {
       let file;
       try {
         file = FileUtils.getFile("coreAppsDir", ["webapps", "webapps.json"], false);
       } catch(e) { }
       if (!file || !file.exists()) {
         return;
       }
       // a
       let data = yield AppsUtils.loadJSONAsync(file.path);
       if (!data) {
         return;
       }
       // b : core apps are not removable.
       for (let id in this.webapps) {
         if (id in data || this.webapps[id].removable)
           continue;
         // Remove the permissions, cookies and private data for this app.
         let localId = this.webapps[id].localId;
         let permMgr = Cc["@mozilla.org/permissionmanager;1"]
                         .getService(Ci.nsIPermissionManager);
         permMgr.removePermissionsForApp(localId, false);
         Services.cookies.removeCookiesForApp(localId, false);
         this._clearPrivateData(localId, false);
         delete this.webapps[id];
       }
       let appDir = FileUtils.getDir("coreAppsDir", ["webapps"], false);
       // c
       for (let id in data) {
         // Core apps have ids matching their domain name (eg: dialer.gaiamobile.org)
         // Use that property to check if they are new or not.
         if (!(id in this.webapps)) {
           this.webapps[id] = data[id];
           this.webapps[id].basePath = appDir.path;
           this.webapps[id].id = id;
           // Create a new localId.
           this.webapps[id].localId = this._nextLocalId();
           // Core apps are not removable.
           if (this.webapps[id].removable === undefined) {
             this.webapps[id].removable = false;
           }
         } else {
           // we fall into this case if the app is present in /system/b2g/webapps/webapps.json
           // and in /data/local/webapps/webapps.json: this happens when updating gaia apps
           // Confere bug 989876
           this.webapps[id].updateTime = data[id].updateTime;
           this.webapps[id].lastUpdateCheck = data[id].updateTime;
         }
       }
     }.bind(this)).then(null, Cu.reportError);
   },
   loadAndUpdateApps: function() {
     return Task.spawn(function() {
       let runUpdate = AppsUtils.isFirstRun(Services.prefs);
       yield this.loadCurrentRegistry();
       if (runUpdate) {
 #ifdef MOZ_WIDGET_GONK
         yield this.installSystemApps();
 #endif
         // At first run, install preloaded apps and set up their permissions.
         for (let id in this.webapps) {
           this.installPreinstalledApp(id);
           this.removeIfHttpsDuplicate(id);
           if (!this.webapps[id]) {
             continue;
           }
           this.updateOfflineCacheForApp(id);
           this.updatePermissionsForApp(id);
         }
         // Need to update the persisted list of apps since
         // installPreinstalledApp() removes the ones failing to install.
         this._saveApps();
       }
       // DataStores must be initialized at startup.
       for (let id in this.webapps) {
         this.updateDataStoreForApp(id);
       }
       this.registerAppsHandlers(runUpdate);
     }.bind(this)).then(null, Cu.reportError);
   },
   updateDataStore: function(aId, aOrigin, aManifestURL, aManifest, aAppStatus) {
     // Just Certified Apps can use DataStores
     let prefName = "dom.testing.datastore_enabled_for_hosted_apps";
     if (aAppStatus != Ci.nsIPrincipal.APP_STATUS_CERTIFIED &&
         (Services.prefs.getPrefType(prefName) == Services.prefs.PREF_INVALID ||
          !Services.prefs.getBoolPref(prefName))) {
       return;
     }
     if ('datastores-owned' in aManifest) {
       for (let name in aManifest['datastores-owned']) {
         let readonly = "access" in aManifest['datastores-owned'][name]
                          ? aManifest['datastores-owned'][name].access == 'readonly'
                          : false;
         dataStoreService.installDataStore(aId, name, aOrigin, aManifestURL,
                                           readonly);
       }
     }
     if ('datastores-access' in aManifest) {
       for (let name in aManifest['datastores-access']) {
         let readonly = ("readonly" in aManifest['datastores-access'][name]) &&
                        !aManifest['datastores-access'][name].readonly
                          ? false : true;
         dataStoreService.installAccessDataStore(aId, name, aOrigin,
                                                 aManifestURL, readonly);
       }
     }
   },
   // |aEntryPoint| is either the entry_point name or the null in which case we
   // use the root of the manifest.
   //
   // TODO Bug 908094 Refine _registerSystemMessagesForEntryPoint(...).
   _registerSystemMessagesForEntryPoint: function(aManifest, aApp, aEntryPoint) {
     let root = aManifest;
     if (aEntryPoint && aManifest.entry_points[aEntryPoint]) {
       root = aManifest.entry_points[aEntryPoint];
     }
     if (!root.messages || !Array.isArray(root.messages) ||
         root.messages.length == 0) {
       return;
     }
     let manifest = new ManifestHelper(aManifest, aApp.origin);
     let launchPath = Services.io.newURI(manifest.fullLaunchPath(aEntryPoint), null, null);
     let manifestURL = Services.io.newURI(aApp.manifestURL, null, null);
     root.messages.forEach(function registerPages(aMessage) {
       let href = launchPath;
       let messageName;
       if (typeof(aMessage) === "object" && Object.keys(aMessage).length === 1) {
         messageName = Object.keys(aMessage)[0];
         let uri;
         try {
           uri = manifest.resolveFromOrigin(aMessage[messageName]);
         } catch(e) {
           debug("system message url (" + aMessage[messageName] + ") is invalid, skipping. " +
                 "Error is: " + e);
           return;
         }
         href = Services.io.newURI(uri, null, null);
       } else {
         messageName = aMessage;
       }
       if (SystemMessagePermissionsChecker
             .isSystemMessagePermittedToRegister(messageName,
                                                 aApp.origin,
                                                 aManifest)) {
         msgmgr.registerPage(messageName, href, manifestURL);
       }
     });
   },
   // |aEntryPoint| is either the entry_point name or the null in which case we
   // use the root of the manifest.
   //
   // TODO Bug 908094 Refine _registerInterAppConnectionsForEntryPoint(...).
   _registerInterAppConnectionsForEntryPoint: function(aManifest, aApp,
                                                       aEntryPoint) {
     let root = aManifest;
     if (aEntryPoint && aManifest.entry_points[aEntryPoint]) {
       root = aManifest.entry_points[aEntryPoint];
     }
     let connections = root.connections;
     if (!connections) {
       return;
     }
     if ((typeof connections) !== "object") {
       debug("|connections| is not an object. Skipping: " + connections);
       return;
     }
     let manifest = new ManifestHelper(aManifest, aApp.origin);
     let launchPathURI = Services.io.newURI(manifest.fullLaunchPath(aEntryPoint),
                                            null, null);
     let manifestURI = Services.io.newURI(aApp.manifestURL, null, null);
     for (let keyword in connections) {
       let connection = connections[keyword];
       // Resolve the handler path from origin. If |handler_path| is absent,
       // use |launch_path| as default.
       let fullHandlerPath;
       let handlerPath = connection.handler_path;
       if (handlerPath) {
         try {
           fullHandlerPath = manifest.resolveFromOrigin(handlerPath);
         } catch(e) {
           debug("Connection's handler path is invalid. Skipping: keyword: " +
                 keyword + " handler_path: " + handlerPath);
           continue;
         }
       }
       let handlerPageURI = fullHandlerPath
                            ? Services.io.newURI(fullHandlerPath, null, null)
                            : launchPathURI;
       if (SystemMessagePermissionsChecker
             .isSystemMessagePermittedToRegister("connection",
                                                 aApp.origin,
                                                 aManifest)) {
         msgmgr.registerPage("connection", handlerPageURI, manifestURI);
       }
       interAppCommService.
         registerConnection(keyword,
                            handlerPageURI,
                            manifestURI,
                            connection.description,
                            connection.rules);
     }
   },
   _registerSystemMessages: function(aManifest, aApp) {
     this._registerSystemMessagesForEntryPoint(aManifest, aApp, null);
     if (!aManifest.entry_points) {
       return;
     }
     for (let entryPoint in aManifest.entry_points) {
       this._registerSystemMessagesForEntryPoint(aManifest, aApp, entryPoint);
     }
   },
   _registerInterAppConnections: function(aManifest, aApp) {
     this._registerInterAppConnectionsForEntryPoint(aManifest, aApp, null);
     if (!aManifest.entry_points) {
       return;
     }
     for (let entryPoint in aManifest.entry_points) {
       this._registerInterAppConnectionsForEntryPoint(aManifest, aApp,
                                                      entryPoint);
     }
   },
   // |aEntryPoint| is either the entry_point name or the null in which case we
   // use the root of the manifest.
   _createActivitiesToRegister: function(aManifest, aApp, aEntryPoint, aRunUpdate) {
     let activitiesToRegister = [];
     let root = aManifest;
     if (aEntryPoint && aManifest.entry_points[aEntryPoint]) {
       root = aManifest.entry_points[aEntryPoint];
     }
     if (!root.activities) {
       return activitiesToRegister;
     }
     let manifest = new ManifestHelper(aManifest, aApp.origin);
     for (let activity in root.activities) {
       let description = root.activities[activity];
       let href = description.href;
       if (!href) {
         href = manifest.launch_path;
       }
       try {
         href = manifest.resolveFromOrigin(href);
       } catch (e) {
         debug("Activity href (" + href + ") is invalid, skipping. " +
               "Error is: " + e);
         continue;
       }
       // Make a copy of the description object since we don't want to modify
       // the manifest itself, but need to register with a resolved URI.
       let newDesc = {};
       for (let prop in description) {
         newDesc[prop] = description[prop];
       }
       newDesc.href = href;
       debug('_createActivitiesToRegister: ' + aApp.manifestURL + ', activity ' +
           activity + ', description.href is ' + newDesc.href);
       if (aRunUpdate) {
         activitiesToRegister.push({ "manifest": aApp.manifestURL,
                                     "name": activity,
                                     "icon": manifest.iconURLForSize(128),
                                     "description": newDesc });
       }
       let launchPath = Services.io.newURI(href, null, null);
       let manifestURL = Services.io.newURI(aApp.manifestURL, null, null);
       if (SystemMessagePermissionsChecker
             .isSystemMessagePermittedToRegister("activity",
                                                 aApp.origin,
                                                 aManifest)) {
         msgmgr.registerPage("activity", launchPath, manifestURL);
       }
     }
     return activitiesToRegister;
   },
   // |aAppsToRegister| contains an array of apps to be registered, where
   // each element is an object in the format of {manifest: foo, app: bar}.
   _registerActivitiesForApps: function(aAppsToRegister, aRunUpdate) {
     // Collect the activities to be registered for root and entry_points.
     let activitiesToRegister = [];
     aAppsToRegister.forEach(function (aApp) {
       let manifest = aApp.manifest;
       let app = aApp.app;
       activitiesToRegister.push.apply(activitiesToRegister,
         this._createActivitiesToRegister(manifest, app, null, aRunUpdate));
       if (!manifest.entry_points) {
         return;
       }
       for (let entryPoint in manifest.entry_points) {
         activitiesToRegister.push.apply(activitiesToRegister,
           this._createActivitiesToRegister(manifest, app, entryPoint, aRunUpdate));
       }
     }, this);
     if (!aRunUpdate || activitiesToRegister.length == 0) {
       this.notifyAppsRegistryReady();
       return;
     }
     // Send the array carrying all the activities to be registered.
     cpmm.sendAsyncMessage("Activities:Register", activitiesToRegister);
   },
   // Better to directly use |_registerActivitiesForApps()| if we have
   // multiple apps to be registered for activities.
   _registerActivities: function(aManifest, aApp, aRunUpdate) {
     this._registerActivitiesForApps([{ manifest: aManifest, app: aApp }], aRunUpdate);
   },
   // |aEntryPoint| is either the entry_point name or the null in which case we
   // use the root of the manifest.
   _createActivitiesToUnregister: function(aManifest, aApp, aEntryPoint) {
     let activitiesToUnregister = [];
     let root = aManifest;
     if (aEntryPoint && aManifest.entry_points[aEntryPoint]) {
       root = aManifest.entry_points[aEntryPoint];
     }
     if (!root.activities) {
       return activitiesToUnregister;
     }
     for (let activity in root.activities) {
       let description = root.activities[activity];
       activitiesToUnregister.push({ "manifest": aApp.manifestURL,
                                     "name": activity,
                                     "description": description });
     }
     return activitiesToUnregister;
   },
   // |aAppsToUnregister| contains an array of apps to be unregistered, where
   // each element is an object in the format of {manifest: foo, app: bar}.
   _unregisterActivitiesForApps: function(aAppsToUnregister) {
     // Collect the activities to be unregistered for root and entry_points.
     let activitiesToUnregister = [];
     aAppsToUnregister.forEach(function (aApp) {
       let manifest = aApp.manifest;
       let app = aApp.app;
       activitiesToUnregister.push.apply(activitiesToUnregister,
         this._createActivitiesToUnregister(manifest, app, null));
       if (!manifest.entry_points) {
         return;
       }
       for (let entryPoint in manifest.entry_points) {
         activitiesToUnregister.push.apply(activitiesToUnregister,
           this._createActivitiesToUnregister(manifest, app, entryPoint));
       }
     }, this);
     // Send the array carrying all the activities to be unregistered.
     cpmm.sendAsyncMessage("Activities:Unregister", activitiesToUnregister);
   },
   // Better to directly use |_unregisterActivitiesForApps()| if we have
   // multiple apps to be unregistered for activities.
   _unregisterActivities: function(aManifest, aApp) {
     this._unregisterActivitiesForApps([{ manifest: aManifest, app: aApp }]);
   },
   _processManifestForIds: function(aIds, aRunUpdate) {
     this._readManifests(aIds).then((aResults) => {
       let appsToRegister = [];
       aResults.forEach((aResult) => {
         let app = this.webapps[aResult.id];
         let manifest = aResult.manifest;
         if (!manifest) {
           // If we can't load the manifest, we probably have a corrupted
           // registry. We delete the app since we can't do anything with it.
           delete this.webapps[aResult.id];
           return;
         }
         app.name = manifest.name;
         app.csp = manifest.csp || "";
         app.role = manifest.role || "";
         if (app.appStatus >= Ci.nsIPrincipal.APP_STATUS_PRIVILEGED) {
           app.redirects = this.sanitizeRedirects(manifest.redirects);
         }
         this._registerSystemMessages(manifest, app);
         this._registerInterAppConnections(manifest, app);
         appsToRegister.push({ manifest: manifest, app: app });
       });
       this._registerActivitiesForApps(appsToRegister, aRunUpdate);
     });
   },
   observe: function(aSubject, aTopic, aData) {
     if (aTopic == "xpcom-shutdown") {
       this.messages.forEach((function(msgName) {
         ppmm.removeMessageListener(msgName, this);
       }).bind(this));
       Services.obs.removeObserver(this, "xpcom-shutdown");
       cpmm = null;
       ppmm = null;
     } else if (aTopic == "memory-pressure") {
       // Clear the manifest cache on memory pressure.
       this._manifestCache = {};
     }
   },
   addMessageListener: function(aMsgNames, aApp, aMm) {
     aMsgNames.forEach(function (aMsgName) {
       let man = aApp && aApp.manifestURL;
       if (!(aMsgName in this.children)) {
         this.children[aMsgName] = [];
       }
       let mmFound = this.children[aMsgName].some(function(mmRef) {
         if (mmRef.mm === aMm) {
           mmRef.refCount++;
           return true;
         }
         return false;
       });
       if (!mmFound) {
         this.children[aMsgName].push({
           mm: aMm,
           refCount: 1
         });
       }
       // If the state reported by the registration is outdated, update it now.
       if ((aMsgName === 'Webapps:FireEvent') ||
           (aMsgName === 'Webapps:UpdateState')) {
         if (man) {
           let app = this.getAppByManifestURL(aApp.manifestURL);
           if (app && ((aApp.installState !== app.installState) ||
                       (aApp.downloading !== app.downloading))) {
             debug("Got a registration from an outdated app: " +
                   aApp.manifestURL);
             let aEvent ={
               type: app.installState,
               app: app,
               manifestURL: app.manifestURL,
               manifest: app.manifest
             };
             aMm.sendAsyncMessage(aMsgName, aEvent);
           }
         }
       }
     }, this);
   },
   removeMessageListener: function(aMsgNames, aMm) {
     if (aMsgNames.length === 1 &&
         aMsgNames[0] === "Webapps:Internal:AllMessages") {
       for (let msgName in this.children) {
         let msg = this.children[msgName];
         for (let mmI = msg.length - 1; mmI >= 0; mmI -= 1) {
           let mmRef = msg[mmI];
           if (mmRef.mm === aMm) {
             msg.splice(mmI, 1);
           }
         }
         if (msg.length === 0) {
           delete this.children[msgName];
         }
       }
       return;
     }
     aMsgNames.forEach(function(aMsgName) {
       if (!(aMsgName in this.children)) {
         return;
       }
       let removeIndex;
       this.children[aMsgName].some(function(mmRef, index) {
         if (mmRef.mm === aMm) {
           mmRef.refCount--;
           if (mmRef.refCount === 0) {
             removeIndex = index;
           }
           return true;
         }
         return false;
       });
       if (removeIndex) {
         this.children[aMsgName].splice(removeIndex, 1);
       }
     }, this);
   },
   receiveMessage: function(aMessage) {
     // nsIPrefBranch throws if pref does not exist, faster to simply write
     // the pref instead of first checking if it is false.
     Services.prefs.setBoolPref("dom.mozApps.used", true);
     // We need to check permissions for calls coming from mozApps.mgmt.
     // These are: getAll(), getNotInstalled(), applyDownload() and uninstall().
     if (["Webapps:GetAll",
          "Webapps:GetNotInstalled",
          "Webapps:ApplyDownload",
          "Webapps:Uninstall"].indexOf(aMessage.name) != -1) {
       if (!aMessage.target.assertPermission("webapps-manage")) {
         debug("mozApps message " + aMessage.name +
         " from a content process with no 'webapps-manage' privileges.");
         return null;
       }
     }
     let msg = aMessage.data || {};
     let mm = aMessage.target;
     msg.mm = mm;
     switch (aMessage.name) {
       case "Webapps:Install": {
 #ifdef MOZ_ANDROID_SYNTHAPKS
         Services.obs.notifyObservers(mm, "webapps-runtime-install", JSON.stringify(msg));
 #else
         this.doInstall(msg, mm);
 #endif
         break;
       }
       case "Webapps:GetSelf":
         this.getSelf(msg, mm);
         break;
       case "Webapps:Uninstall":
         this.doUninstall(msg, mm);
         break;
       case "Webapps:Launch":
         this.doLaunch(msg, mm);
         break;
       case "Webapps:CheckInstalled":
         this.checkInstalled(msg, mm);
         break;
       case "Webapps:GetInstalled":
         this.getInstalled(msg, mm);
         break;
       case "Webapps:GetNotInstalled":
         this.getNotInstalled(msg, mm);
         break;
       case "Webapps:GetAll":
         this.doGetAll(msg, mm);
         break;
       case "Webapps:InstallPackage": {
 #ifdef MOZ_ANDROID_SYNTHAPKS
         Services.obs.notifyObservers(mm, "webapps-runtime-install-package", JSON.stringify(msg));
 #else
         this.doInstallPackage(msg, mm);
 #endif
         break;
       }
       case "Webapps:RegisterForMessages":
         this.addMessageListener(msg.messages, msg.app, mm);
         break;
       case "Webapps:UnregisterForMessages":
         this.removeMessageListener(msg, mm);
         break;
       case "child-process-shutdown":
         this.removeMessageListener(["Webapps:Internal:AllMessages"], mm);
         break;
       case "Webapps:GetList":
         this.addMessageListener(["Webapps:AddApp", "Webapps:RemoveApp"], null, mm);
         return this.webapps;
       case "Webapps:Download":
         this.startDownload(msg.manifestURL);
         break;
       case "Webapps:CancelDownload":
         this.cancelDownload(msg.manifestURL);
         break;
       case "Webapps:CheckForUpdate":
         this.checkForUpdate(msg, mm);
         break;
       case "Webapps:ApplyDownload":
         this.applyDownload(msg.manifestURL);
         break;
       case "Activities:Register:OK":
         this.notifyAppsRegistryReady();
         break;
       case "Webapps:Install:Return:Ack":
         this.onInstallSuccessAck(msg.manifestURL);
         break;
       case "Webapps:AddReceipt":
         this.addReceipt(msg, mm);
         break;
       case "Webapps:RemoveReceipt":
         this.removeReceipt(msg, mm);
         break;
       case "Webapps:ReplaceReceipt":
         this.replaceReceipt(msg, mm);
         break;
     }
   },
   getAppInfo: function getAppInfo(aAppId) {
     return AppsUtils.getAppInfo(this.webapps, aAppId);
   },
   // Some messages can be listened by several content processes:
   // Webapps:AddApp
   // Webapps:RemoveApp
   // Webapps:Install:Return:OK
   // Webapps:Uninstall:Return:OK
   // Webapps:Uninstall:Broadcast:Return:OK
   // Webapps:FireEvent
   // Webapps:checkForUpdate:Return:OK
   // Webapps:UpdateState
   broadcastMessage: function broadcastMessage(aMsgName, aContent) {
     if (!(aMsgName in this.children)) {
       return;
     }
     this.children[aMsgName].forEach(function(mmRef) {
       mmRef.mm.sendAsyncMessage(aMsgName, aContent);
     });
   },
   registerUpdateHandler: function(aHandler) {
     this._updateHandlers.push(aHandler);
   },
   unregisterUpdateHandler: function(aHandler) {
     let index = this._updateHandlers.indexOf(aHandler);
     if (index != -1) {
       this._updateHandlers.splice(index, 1);
     }
   },
   notifyUpdateHandlers: function(aApp, aManifest, aZipPath) {
     for (let updateHandler of this._updateHandlers) {
       updateHandler(aApp, aManifest, aZipPath);
     }
   },
   _getAppDir: function(aId) {
     return FileUtils.getDir(DIRECTORY_NAME, ["webapps", aId], true, true);
   },
   _writeFile: function(aPath, aData) {
     debug("Saving " + aPath);
     let deferred = Promise.defer();
     let file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
     file.initWithPath(aPath);
     // Initialize the file output stream
     let ostream = FileUtils.openSafeFileOutputStream(file);
     // Obtain a converter to convert our data to a UTF-8 encoded input stream.
     let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
                       .createInstance(Ci.nsIScriptableUnicodeConverter);
     converter.charset = "UTF-8";
     // Asynchronously copy the data to the file.
     let istream = converter.convertToInputStream(aData);
     NetUtil.asyncCopy(istream, ostream, function(aResult) {
       if (!Components.isSuccessCode(aResult)) {
         deferred.reject()
       } else {
         deferred.resolve();
       }
     });
     return deferred.promise;
   },
   doLaunch: function (aData, aMm) {
     this.launch(
       aData.manifestURL,
       aData.startPoint,
       aData.timestamp,
       function onsuccess() {
         aMm.sendAsyncMessage("Webapps:Launch:Return:OK", aData);
       },
       function onfailure(reason) {
         aMm.sendAsyncMessage("Webapps:Launch:Return:KO", aData);
       }
     );
   },
   launch: function launch(aManifestURL, aStartPoint, aTimeStamp, aOnSuccess, aOnFailure) {
     let app = this.getAppByManifestURL(aManifestURL);
     if (!app) {
       aOnFailure("NO_SUCH_APP");
       return;
     }
     // Fire an error when trying to launch an app that is not
     // yet fully installed.
     if (app.installState == "pending") {
       aOnFailure("PENDING_APP_NOT_LAUNCHABLE");
       return;
     }
     // We have to clone the app object as nsIDOMApplication objects are
     // stringified as an empty object. (see bug 830376)
     let appClone = AppsUtils.cloneAppObject(app);
     appClone.startPoint = aStartPoint;
     appClone.timestamp = aTimeStamp;
     Services.obs.notifyObservers(null, "webapps-launch", JSON.stringify(appClone));
     aOnSuccess();
   },
   close: function close(aApp) {
     debug("close");
     // We have to clone the app object as nsIDOMApplication objects are
     // stringified as an empty object. (see bug 830376)
     let appClone = AppsUtils.cloneAppObject(aApp);
     Services.obs.notifyObservers(null, "webapps-close", JSON.stringify(appClone));
   },
   cancelDownload: function cancelDownload(aManifestURL, aError) {
     debug("cancelDownload " + aManifestURL);
     let error = aError || "DOWNLOAD_CANCELED";
     let download = AppDownloadManager.get(aManifestURL);
     if (!download) {
       debug("Could not find a download for " + aManifestURL);
       return;
     }
     let app = this.webapps[download.appId];
     if (download.cacheUpdate) {
       try {
         download.cacheUpdate.cancel();
       } catch (e) {
         debug (e);
       }
     } else if (download.channel) {
       try {
         download.channel.cancel(Cr.NS_BINDING_ABORTED);
       } catch(e) { }
     } else {
       return;
     }
     this._saveApps().then(() => {
       this.broadcastMessage("Webapps:UpdateState", {
         app: {
           progress: 0,
           installState: download.previousState,
           downloading: false
         },
         error: error,
         manifestURL: app.manifestURL,
       })
       this.broadcastMessage("Webapps:FireEvent", {
         eventType: "downloaderror",
         manifestURL: app.manifestURL
       });
     });
     AppDownloadManager.remove(aManifestURL);
   },
   startDownload: Task.async(function*(aManifestURL) {
     debug("startDownload for " + aManifestURL);
     let id = this._appIdForManifestURL(aManifestURL);
     let app = this.webapps[id];
     if (!app) {
       debug("startDownload: No app found for " + aManifestURL);
       return;
     }
     if (app.downloading) {
       debug("app is already downloading. Ignoring.");
       return;
     }
     // If the caller is trying to start a download but we have nothing to
     // download, send an error.
     if (!app.downloadAvailable) {
       this.broadcastMessage("Webapps:UpdateState", {
         error: "NO_DOWNLOAD_AVAILABLE",
         manifestURL: app.manifestURL
       });
       this.broadcastMessage("Webapps:FireEvent", {
         eventType: "downloaderror",
         manifestURL: app.manifestURL
       });
       return;
     }
     // First of all, we check if the download is supposed to update an
     // already installed application.
     let isUpdate = (app.installState == "installed");
     // An app download would only be triggered for two reasons: an app
     // update or while retrying to download a previously failed or canceled
     // instalation.
     app.retryingDownload = !isUpdate;
     // We need to get the update manifest here, not the webapp manifest.
     // If this is an update, the update manifest is staged.
     let file = FileUtils.getFile(DIRECTORY_NAME,
                                  ["webapps", id,
                                   isUpdate ? "staged-update.webapp"
                                            : "update.webapp"],
                                  true);
     if (!file.exists()) {
       // This is a hosted app, let's check if it has an appcache
       // and download it.
       let results = yield this._readManifests([{ id: id }]);
       let jsonManifest = results[0].manifest;
       let manifest = new ManifestHelper(jsonManifest, app.origin);
       if (manifest.appcache_path) {
         debug("appcache found");
         this.startOfflineCacheDownload(manifest, app, null, isUpdate);
       } else {
         // Hosted app with no appcache, nothing to do, but we fire a
         // downloaded event.
         debug("No appcache found, sending 'downloaded' for " + aManifestURL);
         app.downloadAvailable = false;
         yield this._saveApps();
         this.broadcastMessage("Webapps:UpdateState", {
           app: app,
           manifest: jsonManifest,
           manifestURL: aManifestURL
         });
         this.broadcastMessage("Webapps:FireEvent", {
           eventType: "downloadsuccess",
           manifestURL: aManifestURL
         });
       }
       return;
     }
     let json = yield AppsUtils.loadJSONAsync(file.path);
     if (!json) {
       debug("startDownload: No update manifest found at " + file.path + " " +
             aManifestURL);
       return;
     }
     let manifest = new ManifestHelper(json, app.manifestURL);
     let [aId, aManifest] = yield this.downloadPackage(manifest, {
         manifestURL: aManifestURL,
         origin: app.origin,
         installOrigin: app.installOrigin,
         downloadSize: app.downloadSize
       }, isUpdate);
     // Success! Keep the zip in of TmpD, we'll move it out when
     // applyDownload() will be called.
     // Save the manifest in TmpD also
     let manFile = OS.Path.join(OS.Constants.Path.tmpDir, "webapps", aId,
                                "manifest.webapp");
     yield this._writeFile(manFile, JSON.stringify(aManifest));
     app = this.webapps[aId];
     // Set state and fire events.
     app.downloading = false;
     app.downloadAvailable = false;
     app.readyToApplyDownload = true;
     app.updateTime = Date.now();
     yield this._saveApps();
     this.broadcastMessage("Webapps:UpdateState", {
       app: app,
       manifestURL: aManifestURL
     });
     this.broadcastMessage("Webapps:FireEvent", {
       eventType: "downloadsuccess",
       manifestURL: aManifestURL
     });
     if (app.installState == "pending") {
       // We restarted a failed download, apply it automatically.
       this.applyDownload(aManifestURL);
     }
   }),
   applyDownload: function applyDownload(aManifestURL) {
     debug("applyDownload for " + aManifestURL);
     let id = this._appIdForManifestURL(aManifestURL);
     let app = this.webapps[id];
     if (!app || (app && !app.readyToApplyDownload)) {
       return;
     }
     // We need to get the old manifest to unregister web activities.
     this.getManifestFor(aManifestURL).then((aOldManifest) => {
       // Move the application.zip and manifest.webapp files out of TmpD
       let tmpDir = FileUtils.getDir("TmpD", ["webapps", id], true, true);
       let manFile = tmpDir.clone();
       manFile.append("manifest.webapp");
       let appFile = tmpDir.clone();
       appFile.append("application.zip");
       let dir = FileUtils.getDir(DIRECTORY_NAME, ["webapps", id], true, true);
       appFile.moveTo(dir, "application.zip");
       manFile.moveTo(dir, "manifest.webapp");
       // Move the staged update manifest to a non staged one.
       let staged = dir.clone();
       staged.append("staged-update.webapp");
       // If we are applying after a restarted download, we have no
       // staged update manifest.
       if (staged.exists()) {
         staged.moveTo(dir, "update.webapp");
       }
       try {
         tmpDir.remove(true);
       } catch(e) { }
       // Clean up the deprecated manifest cache if needed.
       if (id in this._manifestCache) {
         delete this._manifestCache[id];
       }
       // Flush the zip reader cache to make sure we use the new application.zip
       // when re-launching the application.
       let zipFile = dir.clone();
       zipFile.append("application.zip");
       Services.obs.notifyObservers(zipFile, "flush-cache-entry", null);
       // Get the manifest, and set properties.
       this.getManifestFor(aManifestURL).then((aData) => {
         app.downloading = false;
         app.downloadAvailable = false;
         app.downloadSize = 0;
         app.installState = "installed";
         app.readyToApplyDownload = false;
         // Update the staged properties.
         if (app.staged) {
           for (let prop in app.staged) {
             app[prop] = app.staged[prop];
           }
           delete app.staged;
         }
         delete app.retryingDownload;
         // Update the asm.js scripts we need to compile.
         ScriptPreloader.preload(app, aData)
           .then(() => this._saveApps()).then(() => {
           // Update the handlers and permissions for this app.
           this.updateAppHandlers(aOldManifest, aData, app);
           AppsUtils.loadJSONAsync(staged.path).then((aUpdateManifest) => {
             let appObject = AppsUtils.cloneAppObject(app);
             appObject.updateManifest = aUpdateManifest;
             this.notifyUpdateHandlers(appObject, aData, appFile.path);
           });
           if (supportUseCurrentProfile()) {
             PermissionsInstaller.installPermissions(
               { manifest: aData,
                 origin: app.origin,
                 manifestURL: app.manifestURL },
               true);
           }
           this.updateDataStore(this.webapps[id].localId, app.origin,
                                app.manifestURL, aData, app.appStatus);
           this.broadcastMessage("Webapps:UpdateState", {
             app: app,
             manifest: aData,
             manifestURL: app.manifestURL
           });
           this.broadcastMessage("Webapps:FireEvent", {
             eventType: "downloadapplied",
             manifestURL: app.manifestURL
           });
         });
       });
     });
   },
   startOfflineCacheDownload: function(aManifest, aApp, aProfileDir, aIsUpdate) {
     if (!aManifest.appcache_path) {
       return;
     }
     // If the manifest has an appcache_path property, use it to populate the
     // appcache.
     let appcacheURI = Services.io.newURI(aManifest.fullAppcachePath(),
                                          null, null);
     let docURI = Services.io.newURI(aManifest.fullLaunchPath(), null, null);
     // We determine the app's 'installState' according to its previous
     // state. Cancelled downloads should remain as 'pending'. Successfully
     // installed apps should morph to 'updating'.
     if (aIsUpdate) {
       aApp.installState = "updating";
     }
     // We set the 'downloading' flag and update the apps registry right before
     // starting the app download/update.
     aApp.downloading = true;
     aApp.progress = 0;
     DOMApplicationRegistry._saveApps().then(() => {
       DOMApplicationRegistry.broadcastMessage("Webapps:UpdateState", {
         app: {
           downloading: true,
           installState: aApp.installState,
           progress: 0
         },
         manifestURL: aApp.manifestURL
       });
       let cacheUpdate = updateSvc.scheduleAppUpdate(
         appcacheURI, docURI, aApp.localId, false, aProfileDir);
       // We save the download details for potential further usage like
       // cancelling it.
       let download = {
         cacheUpdate: cacheUpdate,
         appId: this._appIdForManifestURL(aApp.manifestURL),
         previousState: aIsUpdate ? "installed" : "pending"
       };
       AppDownloadManager.add(aApp.manifestURL, download);
       cacheUpdate.addObserver(new AppcacheObserver(aApp), false);
     });
   },
   // Returns the MD5 hash of the manifest.
   computeManifestHash: function(aManifest) {
     return AppsUtils.computeHash(JSON.stringify(aManifest));
   },
   // Updates the redirect mapping, activities and system message handlers.
   // aOldManifest can be null if we don't have any handler to unregister.
   updateAppHandlers: function(aOldManifest, aNewManifest, aApp) {
     debug("updateAppHandlers: old=" + aOldManifest + " new=" + aNewManifest);
     this.notifyAppsRegistryStart();
     if (aApp.appStatus >= Ci.nsIPrincipal.APP_STATUS_PRIVILEGED) {
       aApp.redirects = this.sanitizeRedirects(aNewManifest.redirects);
     }
     if (supportSystemMessages()) {
       if (aOldManifest) {
         this._unregisterActivities(aOldManifest, aApp);
       }
       this._registerSystemMessages(aNewManifest, aApp);
       this._registerActivities(aNewManifest, aApp, true);
       this._registerInterAppConnections(aNewManifest, aApp);
     } else {
       // Nothing else to do but notifying we're ready.
       this.notifyAppsRegistryReady();
     }
   },
   checkForUpdate: function(aData, aMm) {
     debug("checkForUpdate for " + aData.manifestURL);
     function sendError(aError) {
       aData.error = aError;
       aMm.sendAsyncMessage("Webapps:CheckForUpdate:Return:KO", aData);
     }
     let id = this._appIdForManifestURL(aData.manifestURL);
     let app = this.webapps[id];
     // We cannot update an app that does not exists.
     if (!app) {
       sendError("NO_SUCH_APP");
       return;
     }
     // We cannot update an app that is not fully installed.
     if (app.installState !== "installed") {
       sendError("PENDING_APP_NOT_UPDATABLE");
       return;
     }
     // We may be able to remove this when Bug 839071 is fixed.
     if (app.downloading) {
       sendError("APP_IS_DOWNLOADING");
       return;
     }
     // If the app is packaged and its manifestURL has an app:// scheme,
     // then we can't have an update.
     if (app.origin.startsWith("app://") &&
         app.manifestURL.startsWith("app://")) {
       aData.error = "NOT_UPDATABLE";
       aMm.sendAsyncMessage("Webapps:CheckForUpdate:Return:KO", aData);
       return;
     }
     // For non-removable hosted apps that lives in the core apps dir we
     // only check the appcache because we can't modify the manifest even
     // if it has changed.
     let onlyCheckAppCache = false;
 #ifdef MOZ_WIDGET_GONK
     let appDir = FileUtils.getDir("coreAppsDir", ["webapps"], false);
     onlyCheckAppCache = (app.basePath == appDir.path);
 #endif
     if (onlyCheckAppCache) {
       // Bail out for packaged apps.
       if (app.origin.startsWith("app://")) {
         aData.error = "NOT_UPDATABLE";
         aMm.sendAsyncMessage("Webapps:CheckForUpdate:Return:KO", aData);
         return;
       }
       // We need the manifest to check if we have an appcache.
       this._readManifests([{ id: id }]).then((aResult) => {
         let manifest = aResult[0].manifest;
         if (!manifest.appcache_path) {
           aData.error = "NOT_UPDATABLE";
           aMm.sendAsyncMessage("Webapps:CheckForUpdate:Return:KO", aData);
           return;
         }
         debug("Checking only appcache for " + aData.manifestURL);
         // Check if the appcache is updatable, and send "downloadavailable" or
         // "downloadapplied".
         let updateObserver = {
           observe: function(aSubject, aTopic, aObsData) {
             debug("onlyCheckAppCache updateSvc.checkForUpdate return for " +
                   app.manifestURL + " - event is " + aTopic);
             if (aTopic == "offline-cache-update-available") {
               app.downloadAvailable = true;
               this._saveApps().then(() => {
                 this.broadcastMessage("Webapps:UpdateState", {
                   app: app,
                   manifestURL: app.manifestURL
                 });
                 this.broadcastMessage("Webapps:FireEvent", {
                   eventType: "downloadavailable",
                   manifestURL: app.manifestURL,
                   requestID: aData.requestID
                 });
               });
             } else {
               aData.error = "NOT_UPDATABLE";
               aMm.sendAsyncMessage("Webapps:CheckForUpdate:Return:KO", aData);
             }
           }
         };
         let helper = new ManifestHelper(manifest, aData.manifestURL);
         debug("onlyCheckAppCache - launch updateSvc.checkForUpdate for " +
               helper.fullAppcachePath());
         updateSvc.checkForUpdate(Services.io.newURI(helper.fullAppcachePath(), null, null),
                                  app.localId, false, updateObserver);
       });
       return;
     }
     // On xhr load request event
     function onload(xhr, oldManifest) {
       debug("Got http status=" + xhr.status + " for " + aData.manifestURL);
       let oldHash = app.manifestHash;
       let isPackage = app.origin.startsWith("app://");
       if (xhr.status == 200) {
         let manifest = xhr.response;
         if (manifest == null) {
           sendError("MANIFEST_PARSE_ERROR");
           return;
         }
         if (!AppsUtils.checkManifest(manifest, app)) {
           sendError("INVALID_MANIFEST");
           return;
         } else if (!AppsUtils.checkInstallAllowed(manifest, app.installOrigin)) {
           sendError("INSTALL_FROM_DENIED");
           return;
         } else {
           AppsUtils.ensureSameAppName(oldManifest, manifest, app);
           let hash = this.computeManifestHash(manifest);
           debug("Manifest hash = " + hash);
           if (isPackage) {
             if (!app.staged) {
               app.staged = { };
             }
             app.staged.manifestHash = hash;
             app.staged.etag = xhr.getResponseHeader("Etag");
           } else {
             app.manifestHash = hash;
             app.etag = xhr.getResponseHeader("Etag");
           }
           app.lastCheckedUpdate = Date.now();
           if (isPackage) {
             if (oldHash != hash) {
               this.updatePackagedApp(aData, id, app, manifest);
             } else {
               this._saveApps().then(() => {
                 // Like if we got a 304, just send a 'downloadapplied'
                 // or downloadavailable event.
                 let eventType = app.downloadAvailable ? "downloadavailable"
                                                       : "downloadapplied";
                 aMm.sendAsyncMessage("Webapps:UpdateState", {
                   app: app,
                   manifestURL: app.manifestURL
                 });
                 aMm.sendAsyncMessage("Webapps:FireEvent", {
                   eventType: eventType,
                   manifestURL: app.manifestURL,
                   requestID: aData.requestID
                 });
               });
             }
           } else {
             // Update only the appcache if the manifest has not changed
             // based on the hash value.
             this.updateHostedApp(aData, id, app, oldManifest,
                                  oldHash == hash ? null : manifest);
           }
         }
       } else if (xhr.status == 304) {
         // The manifest has not changed.
         if (isPackage) {
           app.lastCheckedUpdate = Date.now();
           this._saveApps().then(() => {
             // If the app is a packaged app, we just send a 'downloadapplied'
             // or downloadavailable event.
             let eventType = app.downloadAvailable ? "downloadavailable"
                                                   : "downloadapplied";
             aMm.sendAsyncMessage("Webapps:UpdateState", {
               app: app,
               manifestURL: app.manifestURL
             });
             aMm.sendAsyncMessage("Webapps:FireEvent", {
               eventType: eventType,
               manifestURL: app.manifestURL,
               requestID: aData.requestID
             });
           });
         } else {
           // For hosted apps, even if the manifest has not changed, we check
           // for offline cache updates.
           this.updateHostedApp(aData, id, app, oldManifest, null);
         }
       } else {
         sendError("MANIFEST_URL_ERROR");
       }
     }
     // Try to download a new manifest.
     function doRequest(oldManifest, headers) {
       headers = headers || [];
       let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
                   .createInstance(Ci.nsIXMLHttpRequest);
       xhr.open("GET", aData.manifestURL, true);
       xhr.channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
       headers.forEach(function(aHeader) {
         debug("Adding header: " + aHeader.name + ": " + aHeader.value);
         xhr.setRequestHeader(aHeader.name, aHeader.value);
       });
       xhr.responseType = "json";
       if (app.etag) {
         debug("adding manifest etag:" + app.etag);
         xhr.setRequestHeader("If-None-Match", app.etag);
       }
       xhr.channel.notificationCallbacks =
         this.createLoadContext(app.installerAppId, app.installerIsBrowser);
       xhr.addEventListener("load", onload.bind(this, xhr, oldManifest), false);
       xhr.addEventListener("error", (function() {
         sendError("NETWORK_ERROR");
       }).bind(this), false);
       debug("Checking manifest at " + aData.manifestURL);
       xhr.send(null);
     }
     // Read the current app manifest file
     this._readManifests([{ id: id }]).then((aResult) => {
       let extraHeaders = [];
 #ifdef MOZ_WIDGET_GONK
       let pingManifestURL;
       try {
         pingManifestURL = Services.prefs.getCharPref("ping.manifestURL");
       } catch(e) { }
       if (pingManifestURL && pingManifestURL == aData.manifestURL) {
         // Get the device info.
         let device = libcutils.property_get("ro.product.model");
         extraHeaders.push({ name: "X-MOZ-B2G-DEVICE",
                             value: device || "unknown" });
       }
 #endif
       doRequest.call(this, aResult[0].manifest, extraHeaders);
     });
   },
   // Creates a nsILoadContext object with a given appId and isBrowser flag.
   createLoadContext: function createLoadContext(aAppId, aIsBrowser) {
     return {
        associatedWindow: null,
        topWindow : null,
        appId: aAppId,
        isInBrowserElement: aIsBrowser,
        usePrivateBrowsing: false,
        isContent: false,
        isAppOfType: function(appType) {
          throw Cr.NS_ERROR_NOT_IMPLEMENTED;
        },
        QueryInterface: XPCOMUtils.generateQI([Ci.nsILoadContext,
                                               Ci.nsIInterfaceRequestor,
                                               Ci.nsISupports]),
        getInterface: function(iid) {
          if (iid.equals(Ci.nsILoadContext))
            return this;
          throw Cr.NS_ERROR_NO_INTERFACE;
        }
      }
   },
   updatePackagedApp: Task.async(function*(aData, aId, aApp, aNewManifest) {
     debug("updatePackagedApp");
     // Store the new update manifest.
     let dir = this._getAppDir(aId).path;
     let manFile = OS.Path.join(dir, "staged-update.webapp");
     yield this._writeFile(manFile, JSON.stringify(aNewManifest));
     let manifest = new ManifestHelper(aNewManifest, aApp.manifestURL);
     // A package is available: set downloadAvailable to fire the matching
     // event.
     aApp.downloadAvailable = true;
     aApp.downloadSize = manifest.size;
     aApp.updateManifest = aNewManifest;
     yield this._saveApps();
     this.broadcastMessage("Webapps:UpdateState", {
       app: aApp,
       manifestURL: aApp.manifestURL
     });
     this.broadcastMessage("Webapps:FireEvent", {
       eventType: "downloadavailable",
       manifestURL: aApp.manifestURL,
       requestID: aData.requestID
     });
   }),
   // A hosted app is updated if the app manifest or the appcache needs
   // updating. Even if the app manifest has not changed, we still check
   // for changes in the app cache.
   // 'aNewManifest' would contain the updated app manifest if
   // it has actually been updated, while 'aOldManifest' contains the
   // stored app manifest.
   updateHostedApp: Task.async(function*(aData, aId, aApp, aOldManifest, aNewManifest) {
     debug("updateHostedApp " + aData.manifestURL);
     // Clean up the deprecated manifest cache if needed.
     if (aId in this._manifestCache) {
       delete this._manifestCache[aId];
     }
     aApp.manifest = aNewManifest || aOldManifest;
     let manifest;
     if (aNewManifest) {
       this.updateAppHandlers(aOldManifest, aNewManifest, aApp);
       this.notifyUpdateHandlers(AppsUtils.cloneAppObject(aApp), aNewManifest);
       // Store the new manifest.
       let dir = this._getAppDir(aId).path;
       let manFile = OS.Path.join(dir, "manifest.webapp");
       yield this._writeFile(manFile, JSON.stringify(aNewManifest));
       manifest = new ManifestHelper(aNewManifest, aApp.origin);
       if (supportUseCurrentProfile()) {
         // Update the permissions for this app.
         PermissionsInstaller.installPermissions({
           manifest: aApp.manifest,
           origin: aApp.origin,
           manifestURL: aData.manifestURL
         }, true);
       }
       this.updateDataStore(this.webapps[aId].localId, aApp.origin,
                            aApp.manifestURL, aApp.manifest, aApp.appStatus);
       aApp.name = manifest.name;
       aApp.csp = manifest.csp || "";
       aApp.role = manifest.role || "";
       aApp.updateTime = Date.now();
     } else {
       manifest = new ManifestHelper(aOldManifest, aApp.origin);
     }
     // Update the registry.
     this.webapps[aId] = aApp;
     yield this._saveApps();
     if (!manifest.appcache_path) {
       this.broadcastMessage("Webapps:UpdateState", {
         app: aApp,
         manifest: aApp.manifest,
         manifestURL: aApp.manifestURL
       });
       this.broadcastMessage("Webapps:FireEvent", {
         eventType: "downloadapplied",
         manifestURL: aApp.manifestURL,
         requestID: aData.requestID
       });
     } else {
       // Check if the appcache is updatable, and send "downloadavailable" or
       // "downloadapplied".
       debug("updateHostedApp: updateSvc.checkForUpdate for " +
             manifest.fullAppcachePath());
       let updateDeferred = Promise.defer();
       updateSvc.checkForUpdate(Services.io.newURI(manifest.fullAppcachePath(), null, null),
                                aApp.localId, false,
                                (aSubject, aTopic, aData) => updateDeferred.resolve(aTopic));
       let topic = yield updateDeferred.promise;
       debug("updateHostedApp: updateSvc.checkForUpdate return for " +
             aApp.manifestURL + " - event is " + topic);
       let eventType =
         topic == "offline-cache-update-available" ? "downloadavailable"
                                                   : "downloadapplied";
       aApp.downloadAvailable = (eventType == "downloadavailable");
       yield this._saveApps();
       this.broadcastMessage("Webapps:UpdateState", {
         app: aApp,
         manifest: aApp.manifest,
         manifestURL: aApp.manifestURL
       });
       this.broadcastMessage("Webapps:FireEvent", {
         eventType: eventType,
         manifestURL: aApp.manifestURL,
         requestID: aData.requestID
       });
     }
     delete aApp.manifest;
   }),
   // Downloads the manifest and run checks, then eventually triggers the
   // installation UI.
   doInstall: function doInstall(aData, aMm) {
     let app = aData.app;
     let sendError = function sendError(aError) {
       aData.error = aError;
       aMm.sendAsyncMessage("Webapps:Install:Return:KO", aData);
       Cu.reportError("Error installing app from: " + app.installOrigin +
                      ": " + aError);
     }.bind(this);
     if (app.receipts.length > 0) {
       for (let receipt of app.receipts) {
         let error = this.isReceipt(receipt);
         if (error) {
           sendError(error);
           return;
         }
       }
     }
     // Hosted apps can't be trusted or certified, so just check that the
     // manifest doesn't ask for those.
     function checkAppStatus(aManifest) {
       let manifestStatus = aManifest.type || "web";
       return manifestStatus === "web";
     }
     let checkManifest = (function() {
       if (!app.manifest) {
         sendError("MANIFEST_PARSE_ERROR");
         return false;
       }
       // Disallow multiple hosted apps installations from the same origin for now.
       // We will remove this code after multiple apps per origin are supported (bug 778277).
       // This will also disallow reinstalls from the same origin for now.
       for (let id in this.webapps) {
         if (this.webapps[id].origin == app.origin &&
             !this.webapps[id].packageHash &&
             this._isLaunchable(this.webapps[id])) {
           sendError("MULTIPLE_APPS_PER_ORIGIN_FORBIDDEN");
           return false;
         }
       }
       if (!AppsUtils.checkManifest(app.manifest, app)) {
         sendError("INVALID_MANIFEST");
         return false;
       }
       if (!AppsUtils.checkInstallAllowed(app.manifest, app.installOrigin)) {
         sendError("INSTALL_FROM_DENIED");
         return false;
       }
       if (!checkAppStatus(app.manifest)) {
         sendError("INVALID_SECURITY_LEVEL");
         return false;
       }
       return true;
     }).bind(this);
     let installApp = (function() {
       app.manifestHash = this.computeManifestHash(app.manifest);
       // We allow bypassing the install confirmation process to facilitate
       // automation.
       let prefName = "dom.mozApps.auto_confirm_install";
       if (Services.prefs.prefHasUserValue(prefName) &&
           Services.prefs.getBoolPref(prefName)) {
         this.confirmInstall(aData);
       } else {
         Services.obs.notifyObservers(aMm, "webapps-ask-install",
                                      JSON.stringify(aData));
       }
     }).bind(this);
     // We may already have the manifest (e.g. AutoInstall),
     // in which case we don't need to load it.
     if (app.manifest) {
       if (checkManifest()) {
         installApp();
       }
       return;
     }
     let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
                 .createInstance(Ci.nsIXMLHttpRequest);
     xhr.open("GET", app.manifestURL, true);
     xhr.channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
     xhr.channel.notificationCallbacks = this.createLoadContext(aData.appId,
                                                                aData.isBrowser);
     xhr.responseType = "json";
     xhr.addEventListener("load", (function() {
       if (xhr.status == 200) {
         if (!AppsUtils.checkManifestContentType(app.installOrigin, app.origin,
                                                 xhr.getResponseHeader("content-type"))) {
           sendError("INVALID_MANIFEST");
           return;
         }
         app.manifest = xhr.response;
         if (checkManifest()) {
           app.etag = xhr.getResponseHeader("Etag");
           installApp();
         }
       } else {
         sendError("MANIFEST_URL_ERROR");
       }
     }).bind(this), false);
     xhr.addEventListener("error", (function() {
       sendError("NETWORK_ERROR");
     }).bind(this), false);
     xhr.send(null);
   },
   doInstallPackage: function doInstallPackage(aData, aMm) {
     let app = aData.app;
     let sendError = function sendError(aError) {
       aData.error = aError;
       aMm.sendAsyncMessage("Webapps:Install:Return:KO", aData);
       Cu.reportError("Error installing packaged app from: " +
                      app.installOrigin + ": " + aError);
     }.bind(this);
     if (app.receipts.length > 0) {
       for (let receipt of app.receipts) {
         let error = this.isReceipt(receipt);
         if (error) {
           sendError(error);
           return;
         }
       }
     }
     let checkUpdateManifest = (function() {
       let manifest = app.updateManifest;
       // Disallow reinstalls from the same manifest URL for now.
       let id = this._appIdForManifestURL(app.manifestURL);
       if (id !== null && this._isLaunchable(this.webapps[id])) {
         sendError("REINSTALL_FORBIDDEN");
         return false;
       }
       if (!(AppsUtils.checkManifest(manifest, app) && manifest.package_path)) {
         sendError("INVALID_MANIFEST");
         return false;
       }
       if (!AppsUtils.checkInstallAllowed(manifest, app.installOrigin)) {
         sendError("INSTALL_FROM_DENIED");
         return false;
       }
       return true;
     }).bind(this);
     let installApp = (function() {
       app.manifestHash = this.computeManifestHash(app.updateManifest);
       // We allow bypassing the install confirmation process to facilitate
       // automation.
       let prefName = "dom.mozApps.auto_confirm_install";
       if (Services.prefs.prefHasUserValue(prefName) &&
           Services.prefs.getBoolPref(prefName)) {
         this.confirmInstall(aData);
       } else {
         Services.obs.notifyObservers(aMm, "webapps-ask-install",
                                      JSON.stringify(aData));
       }
     }).bind(this);
     // We may already have the manifest (e.g. AutoInstall),
     // in which case we don't need to load it.
     if (app.updateManifest) {
       if (checkUpdateManifest()) {
         installApp();
       }
       return;
     }
     let xhr = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
                 .createInstance(Ci.nsIXMLHttpRequest);
     xhr.open("GET", app.manifestURL, true);
     xhr.channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
     xhr.channel.notificationCallbacks = this.createLoadContext(aData.appId,
                                                                aData.isBrowser);
     xhr.responseType = "json";
     xhr.addEventListener("load", (function() {
       if (xhr.status == 200) {
         if (!AppsUtils.checkManifestContentType(app.installOrigin, app.origin,
                                                 xhr.getResponseHeader("content-type"))) {
           sendError("INVALID_MANIFEST");
           return;
         }
         app.updateManifest = xhr.response;
         if (!app.updateManifest) {
           sendError("MANIFEST_PARSE_ERROR");
           return;
         }
         if (checkUpdateManifest()) {
           app.etag = xhr.getResponseHeader("Etag");
           debug("at install package got app etag=" + app.etag);
           installApp();
         }
       }
       else {
         sendError("MANIFEST_URL_ERROR");
       }
     }).bind(this), false);
     xhr.addEventListener("error", (function() {
       sendError("NETWORK_ERROR");
     }).bind(this), false);
     xhr.send(null);
   },
   denyInstall: function(aData) {
     let packageId = aData.app.packageId;
     if (packageId) {
       let dir = FileUtils.getDir("TmpD", ["webapps", packageId],
                                  true, true);
       try {
         dir.remove(true);
       } catch(e) {
       }
     }
     aData.mm.sendAsyncMessage("Webapps:Install:Return:KO", aData);
   },
   // This function is called after we called the onsuccess callback on the
   // content side. This let the webpage the opportunity to set event handlers
   // on the app before we start firing progress events.
   queuedDownload: {},
   queuedPackageDownload: {},
 onInstallSuccessAck: function onInstallSuccessAck(aManifestURL,
                                                   aDontNeedNetwork) {
     // If we are offline, register to run when we'll be online.
     if ((Services.io.offline) && !aDontNeedNetwork) {
       let onlineWrapper = {
         observe: function(aSubject, aTopic, aData) {
           Services.obs.removeObserver(onlineWrapper,
                                       "network:offline-status-changed");
           DOMApplicationRegistry.onInstallSuccessAck(aManifestURL);
         }
       };
       Services.obs.addObserver(onlineWrapper,
                                "network:offline-status-changed", false);
       return;
     }
     let cacheDownload = this.queuedDownload[aManifestURL];
     if (cacheDownload) {
       this.startOfflineCacheDownload(cacheDownload.manifest,
                                      cacheDownload.app,
                                      cacheDownload.profileDir);
       delete this.queuedDownload[aManifestURL];
       return;
     }
     let packageDownload = this.queuedPackageDownload[aManifestURL];
     if (packageDownload) {
       let manifest = packageDownload.manifest;
       let newApp = packageDownload.app;
       let installSuccessCallback = packageDownload.callback;
       delete this.queuedPackageDownload[aManifestURL];
       this.downloadPackage(manifest, newApp, false).then(
         this._onDownloadPackage.bind(this, newApp, installSuccessCallback)
       );
     }
   },
   _setupApp: function(aData, aId) {
     let app = aData.app;
     // app can be uninstalled
     app.removable = true;
     if (aData.isPackage) {
       // Override the origin with the correct id.
       app.origin = "app://" + aId;
     }
     app.id = aId;
     app.installTime = Date.now();
     app.lastUpdateCheck = Date.now();
     return app;
   },
   _cloneApp: function(aData, aNewApp, aManifest, aId, aLocalId) {
     let appObject = AppsUtils.cloneAppObject(aNewApp);
     appObject.appStatus =
       aNewApp.appStatus || Ci.nsIPrincipal.APP_STATUS_INSTALLED;
     if (aManifest.appcache_path) {
       appObject.installState = "pending";
       appObject.downloadAvailable = true;
       appObject.downloading = true;
       appObject.downloadSize = 0;
       appObject.readyToApplyDownload = false;
     } else if (aManifest.package_path) {
       appObject.installState = "pending";
       appObject.downloadAvailable = true;
       appObject.downloading = true;
       appObject.downloadSize = aManifest.size;
       appObject.readyToApplyDownload = false;
     } else {
       appObject.installState = "installed";
       appObject.downloadAvailable = false;
       appObject.downloading = false;
       appObject.readyToApplyDownload = false;
     }
     appObject.localId = aLocalId;
     appObject.basePath = OS.Path.dirname(this.appsFile);
     appObject.name = aManifest.name;
     appObject.csp = aManifest.csp || "";
     appObject.role = aManifest.role || "";
     appObject.installerAppId = aData.appId;
     appObject.installerIsBrowser = aData.isBrowser;
     return appObject;
   },
   _writeManifestFile: function(aId, aIsPackage, aJsonManifest) {
     debug("_writeManifestFile");
     // For packaged apps, keep the update manifest distinct from the app manifest.
     let manifestName = aIsPackage ? "update.webapp" : "manifest.webapp";
     let dir = this._getAppDir(aId).path;
     let manFile = OS.Path.join(dir, manifestName);
     this._writeFile(manFile, JSON.stringify(aJsonManifest));
   },
   // Add an app that is already installed to the registry.
   addInstalledApp: Task.async(function*(aApp, aManifest, aUpdateManifest) {
     if (this.getAppLocalIdByManifestURL(aApp.manifestURL) !=
         Ci.nsIScriptSecurityManager.NO_APP_ID) {
       return;
     }
     let app = AppsUtils.cloneAppObject(aApp);
     if (!AppsUtils.checkManifest(aManifest, app) ||
         (aUpdateManifest && !AppsUtils.checkManifest(aUpdateManifest, app))) {
       return;
     }
     app.name = aManifest.name;
     app.csp = aManifest.csp || "";
     app.appStatus = AppsUtils.getAppManifestStatus(aManifest);
     app.removable = true;
     // Reuse the app ID if the scheme is "app".
     let uri = Services.io.newURI(app.origin, null, null);
     if (uri.scheme == "app") {
       app.id = uri.host;
     } else {
       app.id = this.makeAppId();
     }
     app.localId = this._nextLocalId();
     app.basePath = OS.Path.dirname(this.appsFile);
     app.progress = 0.0;
     app.installState = "installed";
     app.downloadAvailable = false;
     app.downloading = false;
     app.readyToApplyDownload = false;
     if (aUpdateManifest && aUpdateManifest.size) {
       app.downloadSize = aUpdateManifest.size;
     }
     app.manifestHash = AppsUtils.computeHash(JSON.stringify(aUpdateManifest ||
                                                             aManifest));
     let zipFile = WebappOSUtils.getPackagePath(app);
     app.packageHash = yield this._computeFileHash(zipFile);
     app.role = aManifest.role || "";
     app.redirects = this.sanitizeRedirects(aManifest.redirects);
     this.webapps[app.id] = app;
     // Store the manifest in the manifest cache, so we don't need to re-read it
     this._manifestCache[app.id] = app.manifest;
     // Store the manifest and the updateManifest.
     this._writeManifestFile(app.id, false, aManifest);
     if (aUpdateManifest) {
       this._writeManifestFile(app.id, true, aUpdateManifest);
     }
     this._saveApps().then(() => {
       this.broadcastMessage("Webapps:AddApp", { id: app.id, app: app });
     });
   }),
   confirmInstall: function(aData, aProfileDir, aInstallSuccessCallback) {
     debug("confirmInstall");
     let origin = Services.io.newURI(aData.app.origin, null, null);
     let id = this._appIdForManifestURL(aData.app.manifestURL);
     let manifestURL = origin.resolve(aData.app.manifestURL);
     let localId = this.getAppLocalIdByManifestURL(manifestURL);
     let isReinstall = false;
     // Installing an application again is considered as an update.
     if (id) {
       isReinstall = true;
       let dir = this._getAppDir(id);
       try {
         dir.remove(true);
       } catch(e) { }
     } else {
       id = this.makeAppId();
       localId = this._nextLocalId();
     }
     let app = this._setupApp(aData, id);
     let jsonManifest = aData.isPackage ? app.updateManifest : app.manifest;
     this._writeManifestFile(id, aData.isPackage, jsonManifest);
     debug("app.origin: " + app.origin);
     let manifest = new ManifestHelper(jsonManifest, app.origin);
     let appObject = this._cloneApp(aData, app, manifest, id, localId);
     this.webapps[id] = appObject;
     // For package apps, the permissions are not in the mini-manifest, so
     // don't update the permissions yet.
     if (!aData.isPackage) {
       if (supportUseCurrentProfile()) {
         PermissionsInstaller.installPermissions(
           {
             origin: appObject.origin,
             manifestURL: appObject.manifestURL,
             manifest: jsonManifest
           },
           isReinstall,
           this.uninstall.bind(this, aData, aData.mm)
         );
       }
       this.updateDataStore(this.webapps[id].localId,  this.webapps[id].origin,
                            this.webapps[id].manifestURL, jsonManifest,
                            this.webapps[id].appStatus);
     }
     for each (let prop in ["installState", "downloadAvailable", "downloading",
                            "downloadSize", "readyToApplyDownload"]) {
       aData.app[prop] = appObject[prop];
     }
     if (manifest.appcache_path) {
       this.queuedDownload[app.manifestURL] = {
         manifest: manifest,
         app: appObject,
         profileDir: aProfileDir
       }
     }
     // We notify about the successful installation via mgmt.oninstall and the
     // corresponging DOMRequest.onsuccess event as soon as the app is properly
     // saved in the registry.
     this._saveApps().then(() => {
       this.broadcastMessage("Webapps:AddApp", { id: id, app: appObject });
       if (aData.isPackage && aData.apkInstall && !aData.requestID) {
         // Skip directly to onInstallSuccessAck, since there isn't
         // a WebappsRegistry to receive Webapps:Install:Return:OK and respond
         // Webapps:Install:Return:Ack when an app is being auto-installed.
         this.onInstallSuccessAck(app.manifestURL);
       } else {
         // Broadcast Webapps:Install:Return:OK so the WebappsRegistry can notify
         // the installing page about the successful install, after which it'll
         // respond Webapps:Install:Return:Ack, which calls onInstallSuccessAck.
         this.broadcastMessage("Webapps:Install:Return:OK", aData);
       }
       if (!aData.isPackage) {
         this.updateAppHandlers(null, app.manifest, app);
         if (aInstallSuccessCallback) {
           aInstallSuccessCallback(app.manifest);
         }
       }
       Services.obs.notifyObservers(null, "webapps-installed",
         JSON.stringify({ manifestURL: app.manifestURL }));
     });
     let dontNeedNetwork = false;
     if (manifest.package_path) {
       // If it is a local app then it must been installed from a local file
       // instead of web.
 #ifdef MOZ_ANDROID_SYNTHAPKS
       // In that case, we would already have the manifest, not just the update
       // manifest.
       dontNeedNetwork = !!aData.app.manifest;
 #else
       if (aData.app.localInstallPath) {
         dontNeedNetwork = true;
         jsonManifest.package_path = "file://" + aData.app.localInstallPath;
       }
 #endif
       // origin for install apps is meaningless here, since it's app:// and this
       // can't be used to resolve package paths.
       manifest = new ManifestHelper(jsonManifest, app.manifestURL);
       this.queuedPackageDownload[app.manifestURL] = {
         manifest: manifest,
         app: appObject,
         callback: aInstallSuccessCallback
       };
     }
     if (aData.forceSuccessAck) {
       // If it's a local install, there's no content process so just
       // ack the install.
       this.onInstallSuccessAck(app.manifestURL, dontNeedNetwork);
     }
   },
 /**
    * Install the package after successfully downloading it
    *
    * Bound params:
    *
    * @param aNewApp {Object} the new app data
    * @param aInstallSuccessCallback {Function}
    *        the callback to call on install success
    *
    * Passed params:
    *
    * @param aId {Integer} the unique ID of the application
    * @param aManifest {Object} The manifest of the application
    */
   _onDownloadPackage: Task.async(function*(aNewApp, aInstallSuccessCallback,
                                [aId, aManifest]) {
     debug("_onDownloadPackage");
     // Success! Move the zip out of TmpD.
     let app = this.webapps[aId];
     let zipFile =
       FileUtils.getFile("TmpD", ["webapps", aId, "application.zip"], true);
     let dir = this._getAppDir(aId);
     zipFile.moveTo(dir, "application.zip");
     let tmpDir = FileUtils.getDir("TmpD", ["webapps", aId], true, true);
     try {
       tmpDir.remove(true);
     } catch(e) { }
     // Save the manifest
     let manFile = OS.Path.join(dir.path, "manifest.webapp");
     yield this._writeFile(manFile, JSON.stringify(aManifest));
     // Set state and fire events.
     app.installState = "installed";
     app.downloading = false;
     app.downloadAvailable = false;
     yield this._saveApps();
     this.updateAppHandlers(null, aManifest, aNewApp);
     // Clear the manifest cache in case it holds the update manifest.
     if (aId in this._manifestCache) {
       delete this._manifestCache[aId];
     }
     this.broadcastMessage("Webapps:AddApp", { id: aId, app: aNewApp });
     Services.obs.notifyObservers(null, "webapps-installed",
       JSON.stringify({ manifestURL: aNewApp.manifestURL }));
     if (supportUseCurrentProfile()) {
       // Update the permissions for this app.
       PermissionsInstaller.installPermissions({
         manifest: aManifest,
         origin: aNewApp.origin,
         manifestURL: aNewApp.manifestURL
       }, true);
     }
     this.updateDataStore(this.webapps[aId].localId, aNewApp.origin,
                          aNewApp.manifestURL, aManifest, aNewApp.appStatus);
     this.broadcastMessage("Webapps:UpdateState", {
       app: app,
       manifest: aManifest,
       manifestURL: aNewApp.manifestURL
     });
     // Check if we have asm.js code to preload for this application.
     yield ScriptPreloader.preload(aNewApp, aManifest);
     this.broadcastMessage("Webapps:FireEvent", {
       eventType: ["downloadsuccess", "downloadapplied"],
       manifestURL: aNewApp.manifestURL
     });
     if (aInstallSuccessCallback) {
       aInstallSuccessCallback(aManifest, zipFile.path);
     }
   }),
   _nextLocalId: function() {
     let id = Services.prefs.getIntPref("dom.mozApps.maxLocalId") + 1;
     while (this.getManifestURLByLocalId(id)) {
       id++;
     }
     Services.prefs.setIntPref("dom.mozApps.maxLocalId", id);
     Services.prefs.savePrefFile(null);
     return id;
   },
   _appIdForManifestURL: function(aURI) {
     for (let id in this.webapps) {
       if (this.webapps[id].manifestURL == aURI)
         return id;
     }
     return null;
   },
   makeAppId: function() {
     let uuidGenerator = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator);
     return uuidGenerator.generateUUID().toString();
   },
   _saveApps: function() {
     return this._writeFile(this.appsFile, JSON.stringify(this.webapps, null, 2));
   },
   /**
     * Asynchronously reads a list of manifests
     */
   _manifestCache: {},
   _readManifests: function(aData) {
     return Task.spawn(function*() {
       for (let elem of aData) {
         let id = elem.id;
         if (!this._manifestCache[id]) {
           // the manifest file used to be named manifest.json, so fallback on this.
           let baseDir = this.webapps[id].basePath == this.getCoreAppsBasePath()
                           ? "coreAppsDir" : DIRECTORY_NAME;
           let dir = FileUtils.getDir(baseDir, ["webapps", id], false, true);
           let fileNames = ["manifest.webapp", "update.webapp", "manifest.json"];
           for (let fileName of fileNames) {
             this._manifestCache[id] = yield AppsUtils.loadJSONAsync(OS.Path.join(dir.path, fileName));
             if (this._manifestCache[id]) {
               break;
             }
           }
         }
         elem.manifest = this._manifestCache[id];
       }
       return aData;
     }.bind(this)).then(null, Cu.reportError);
   },
   downloadPackage: function(aManifest, aNewApp, aIsUpdate, aOnSuccess) {
     // Here are the steps when installing a package:
     // - create a temp directory where to store the app.
     // - download the zip in this directory.
     // - check the signature on the zip.
     // - extract the manifest from the zip and check it.
     // - ask confirmation to the user.
     // - add the new app to the registry.
     // If we fail at any step, we revert the previous ones and return an error.
     // We define these outside the task to use them in its reject handler.
     let id = this._appIdForManifestURL(aNewApp.manifestURL);
     let oldApp = this.webapps[id];
     return Task.spawn((function*() {
       yield this._ensureSufficientStorage(aNewApp);
       let fullPackagePath = aManifest.fullPackagePath();
       // Check if it's a local file install (we've downloaded/sideloaded the
       // package already, it existed on the build, or it came with an APK).
       // Note that this variable also controls whether files signed with expired
       // certificates are accepted or not. If isLocalFileInstall is true and the
       // device date is earlier than the build generation date, then the signature
       // will be accepted even if the certificate is expired.
       let isLocalFileInstall =
         Services.io.extractScheme(fullPackagePath) === 'file';
       debug("About to download " + fullPackagePath);
       let requestChannel = this._getRequestChannel(fullPackagePath,
                                                    isLocalFileInstall,
                                                    oldApp,
                                                    aNewApp);
       AppDownloadManager.add(
         aNewApp.manifestURL,
         {
           channel: requestChannel,
           appId: id,
           previousState: aIsUpdate ? "installed" : "pending"
         }
       );
       // We set the 'downloading' flag to true right before starting the fetch.
       oldApp.downloading = true;
       // We determine the app's 'installState' according to its previous
       // state. Cancelled download should remain as 'pending'. Successfully
       // installed apps should morph to 'updating'.
       oldApp.installState = aIsUpdate ? "updating" : "pending";
       // initialize the progress to 0 right now
       oldApp.progress = 0;
       let zipFile = yield this._getPackage(requestChannel, id, oldApp, aNewApp);
       let hash = yield this._computeFileHash(zipFile.path);
       let responseStatus = requestChannel.responseStatus;
       let oldPackage = (responseStatus == 304 || hash == oldApp.packageHash);
       if (oldPackage) {
         debug("package's etag or hash unchanged; sending 'applied' event");
         // The package's Etag or hash has not changed.
         // We send a "applied" event right away.
         this._sendAppliedEvent(aNewApp, oldApp, id);
         return;
       }
       let newManifest = yield this._openAndReadPackage(zipFile, oldApp, aNewApp,
               isLocalFileInstall, aIsUpdate, aManifest, requestChannel, hash);
       AppDownloadManager.remove(aNewApp.manifestURL);
       return [oldApp.id, newManifest];
     }).bind(this)).then(
       aOnSuccess,
       this._revertDownloadPackage.bind(this, id, oldApp, aNewApp, aIsUpdate)
     );
   },
   _ensureSufficientStorage: function(aNewApp) {
     let deferred = Promise.defer();
     let navigator = Services.wm.getMostRecentWindow(chromeWindowType)
                             .navigator;
     let deviceStorage = null;
     if (navigator.getDeviceStorage) {
       deviceStorage = navigator.getDeviceStorage("apps");
     }
     if (deviceStorage) {
       let req = deviceStorage.freeSpace();
       req.onsuccess = req.onerror = e => {
         let freeBytes = e.target.result;
         let sufficientStorage = this._checkDownloadSize(freeBytes, aNewApp);
         if (sufficientStorage) {
           deferred.resolve();
         } else {
           deferred.reject("INSUFFICIENT_STORAGE");
         }
       }
     } else {
       debug("No deviceStorage");
       // deviceStorage isn't available, so use FileUtils to find the size of
       // available storage.
       let dir = FileUtils.getDir(DIRECTORY_NAME, ["webapps"], true, true);
       try {
         let sufficientStorage = this._checkDownloadSize(dir.diskSpaceAvailable,
                                                         aNewApp);
         if (sufficientStorage) {
           deferred.resolve();
         } else {
           deferred.reject("INSUFFICIENT_STORAGE");
         }
       } catch(ex) {
         // If disk space information isn't available, we'll end up here.
         // We should proceed anyway, otherwise devices that support neither
         // deviceStorage nor diskSpaceAvailable will never be able to install
         // packaged apps.
         deferred.resolve();
       }
     }
     return deferred.promise;
   },
   _checkDownloadSize: function(aFreeBytes, aNewApp) {
     if (aFreeBytes) {
       debug("Free storage: " + aFreeBytes + ". Download size: " +
             aNewApp.downloadSize);
       if (aFreeBytes <=
           aNewApp.downloadSize + AppDownloadManager.MIN_REMAINING_FREESPACE) {
         return false;
       }
     }
     return true;
   },
   _getRequestChannel: function(aFullPackagePath, aIsLocalFileInstall, aOldApp,
                                aNewApp) {
     let requestChannel;
     if (aIsLocalFileInstall) {
       requestChannel = NetUtil.newChannel(aFullPackagePath)
                               .QueryInterface(Ci.nsIFileChannel);
     } else {
       requestChannel = NetUtil.newChannel(aFullPackagePath)
                               .QueryInterface(Ci.nsIHttpChannel);
       requestChannel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
     }
     if (aOldApp.packageEtag && !aIsLocalFileInstall) {
       debug("Add If-None-Match header: " + aOldApp.packageEtag);
       requestChannel.setRequestHeader("If-None-Match", aOldApp.packageEtag,
                                       false);
     }
     let lastProgressTime = 0;
     requestChannel.notificationCallbacks = {
       QueryInterface: function(aIID) {
         if (aIID.equals(Ci.nsISupports)          ||
             aIID.equals(Ci.nsIProgressEventSink) ||
             aIID.equals(Ci.nsILoadContext))
           return this;
         throw Cr.NS_ERROR_NO_INTERFACE;
       },
       getInterface: function(aIID) {
         return this.QueryInterface(aIID);
       },
       onProgress: (function(aRequest, aContext, aProgress, aProgressMax) {
         aOldApp.progress = aProgress;
         let now = Date.now();
         if (now - lastProgressTime > MIN_PROGRESS_EVENT_DELAY) {
           debug("onProgress: " + aProgress + "/" + aProgressMax);
           this._sendDownloadProgressEvent(aNewApp, aProgress);
           lastProgressTime = now;
           this._saveApps();
         }
       }).bind(this),
       onStatus: function(aRequest, aContext, aStatus, aStatusArg) { },
       // nsILoadContext
       appId: aOldApp.installerAppId,
       isInBrowserElement: aOldApp.installerIsBrowser,
       usePrivateBrowsing: false,
       isContent: false,
       associatedWindow: null,
       topWindow : null,
       isAppOfType: function(appType) {
         throw Cr.NS_ERROR_NOT_IMPLEMENTED;
       }
     };
     return requestChannel;
   },
   _sendDownloadProgressEvent: function(aNewApp, aProgress) {
     this.broadcastMessage("Webapps:UpdateState", {
       app: {
         progress: aProgress
       },
       manifestURL: aNewApp.manifestURL
     });
     this.broadcastMessage("Webapps:FireEvent", {
       eventType: "progress",
       manifestURL: aNewApp.manifestURL
     });
   },
   _getPackage: function(aRequestChannel, aId, aOldApp, aNewApp) {
     let deferred = Promise.defer();
     // Staging the zip in TmpD until all the checks are done.
     let zipFile =
       FileUtils.getFile("TmpD", ["webapps", aId, "application.zip"], true);
     // We need an output stream to write the channel content to the zip file.
     let outputStream = Cc["@mozilla.org/network/file-output-stream;1"]
                          .createInstance(Ci.nsIFileOutputStream);
     // write, create, truncate
     outputStream.init(zipFile, 0x02 | 0x08 | 0x20, parseInt("0664", 8), 0);
     let bufferedOutputStream =
       Cc['@mozilla.org/network/buffered-output-stream;1']
         .createInstance(Ci.nsIBufferedOutputStream);
     bufferedOutputStream.init(outputStream, 1024);
     // Create a listener that will give data to the file output stream.
     let listener = Cc["@mozilla.org/network/simple-stream-listener;1"]
                      .createInstance(Ci.nsISimpleStreamListener);
     listener.init(bufferedOutputStream, {
       onStartRequest: function(aRequest, aContext) {
         // Nothing to do there anymore.
       },
       onStopRequest: function(aRequest, aContext, aStatusCode) {
         bufferedOutputStream.close();
         outputStream.close();
         if (!Components.isSuccessCode(aStatusCode)) {
           deferred.reject("NETWORK_ERROR");
           return;
         }
         // If we get a 4XX or a 5XX http status, bail out like if we had a
         // network error.
         let responseStatus = aRequestChannel.responseStatus;
         if (responseStatus >= 400 && responseStatus <= 599) {
           // unrecoverable error, don't bug the user
           aOldApp.downloadAvailable = false;
           deferred.reject("NETWORK_ERROR");
           return;
         }
         deferred.resolve(zipFile);
       }
     });
     aRequestChannel.asyncOpen(listener, null);
     // send a first progress event to correctly set the DOM object's properties
     this._sendDownloadProgressEvent(aNewApp, 0);
     return deferred.promise;
   },
   /**
    * Compute the MD5 hash of a file, doing async IO off the main thread.
    *
    * @param   {String} aFilePath
    *                   the path of the file to hash
    * @returns {String} the MD5 hash of the file
    */
   _computeFileHash: function(aFilePath) {
     let deferred = Promise.defer();
     let file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile);
     file.initWithPath(aFilePath);
     NetUtil.asyncFetch(file, function(inputStream, status) {
       if (!Components.isSuccessCode(status)) {
         debug("Error reading " + aFilePath + ": " + e);
         deferred.reject();
         return;
       }
       let hasher = Cc["@mozilla.org/security/hash;1"]
                      .createInstance(Ci.nsICryptoHash);
       // We want to use the MD5 algorithm.
       hasher.init(hasher.MD5);
       const PR_UINT32_MAX = 0xffffffff;
       hasher.updateFromStream(inputStream, PR_UINT32_MAX);
       // Return the two-digit hexadecimal code for a byte.
       function toHexString(charCode) {
         return ("0" + charCode.toString(16)).slice(-2);
       }
       // We're passing false to get the binary hash and not base64.
       let data = hasher.finish(false);
       // Convert the binary hash data to a hex string.
       let hash = [toHexString(data.charCodeAt(i)) for (i in data)].join("");
       debug("File hash computed: " + hash);
       deferred.resolve(hash);
     });
     return deferred.promise;
   },
   /**
    * Send an "applied" event right away for the package being installed.
    *
    * XXX We use this to exit the app update process early when the downloaded
    * package is identical to the last one we installed.  Presumably we do
    * something similar after updating the app, and we could refactor both cases
    * to use the same code to send the "applied" event.
    *
    * @param aNewApp {Object} the new app data
    * @param aOldApp {Object} the currently stored app data
    * @param aId {String} the unique id of the app
    */
   _sendAppliedEvent: function(aNewApp, aOldApp, aId) {
     aOldApp.downloading = false;
     aOldApp.downloadAvailable = false;
     aOldApp.downloadSize = 0;
     aOldApp.installState = "installed";
     aOldApp.readyToApplyDownload = false;
     if (aOldApp.staged && aOldApp.staged.manifestHash) {
       // If we're here then the manifest has changed but the package
       // hasn't. Let's clear this, so we don't keep offering
       // a bogus update to the user
       aOldApp.manifestHash = aOldApp.staged.manifestHash;
       aOldApp.etag = aOldApp.staged.etag || aOldApp.etag;
       aOldApp.staged = {};
       // Move the staged update manifest to a non staged one.
       try {
         let staged = this._getAppDir(aId);
         staged.append("staged-update.webapp");
         staged.moveTo(staged.parent, "update.webapp");
       } catch (ex) {
         // We don't really mind much if this fails.
       }
     }
     // Save the updated registry, and cleanup the tmp directory.
     this._saveApps().then(() => {
       this.broadcastMessage("Webapps:UpdateState", {
         app: aOldApp,
         manifestURL: aNewApp.manifestURL
       });
       this.broadcastMessage("Webapps:FireEvent", {
         manifestURL: aNewApp.manifestURL,
         eventType: ["downloadsuccess", "downloadapplied"]
       });
     });
     let file = FileUtils.getFile("TmpD", ["webapps", aId], false);
     if (file && file.exists()) {
       file.remove(true);
     }
   },
   _openAndReadPackage: function(aZipFile, aOldApp, aNewApp, aIsLocalFileInstall,
                                 aIsUpdate, aManifest, aRequestChannel, aHash) {
     return Task.spawn((function*() {
       let zipReader, isSigned, newManifest;
       try {
         [zipReader, isSigned] = yield this._openPackage(aZipFile, aOldApp,
                                                         aIsLocalFileInstall);
         newManifest = yield this._readPackage(aOldApp, aNewApp,
                 aIsLocalFileInstall, aIsUpdate, aManifest, aRequestChannel,
                 aHash, zipReader, isSigned);
       } catch (e) {
         debug("package open/read error: " + e);
         // Something bad happened when opening/reading the package.
         // Unrecoverable error, don't bug the user.
         // Apps with installState 'pending' does not produce any
         // notification, so we are safe with its current
         // downloadAvailable state.
         if (aOldApp.installState !== "pending") {
           aOldApp.downloadAvailable = false;
         }
         if (typeof e == 'object') {
           Cu.reportError("Error while reading package:" + e);
           throw "INVALID_PACKAGE";
         } else {
           throw e;
         }
       } finally {
         if (zipReader) {
           zipReader.close();
         }
       }
       return newManifest;
     }).bind(this));
   },
   _openPackage: function(aZipFile, aApp, aIsLocalFileInstall) {
     return Task.spawn((function*() {
       let certDb;
       try {
         certDb = Cc["@mozilla.org/security/x509certdb;1"]
                    .getService(Ci.nsIX509CertDB);
       } catch (e) {
         debug("nsIX509CertDB error: " + e);
         // unrecoverable error, don't bug the user
         aApp.downloadAvailable = false;
         throw "CERTDB_ERROR";
       }
       let [result, zipReader] = yield this._openSignedPackage(aApp.installOrigin,
                                                               aApp.manifestURL,
                                                               aZipFile,
                                                               certDb);
       // We cannot really know if the system date is correct or
       // not. What we can know is if it's after the build date or not,
       // and assume the build date is correct (which we cannot
       // really know either).
       let isLaterThanBuildTime = Date.now() > PLATFORM_BUILD_ID_TIME;
       let isSigned;
       if (Components.isSuccessCode(result)) {
         isSigned = true;
       } else if (result == Cr.NS_ERROR_SIGNED_JAR_MODIFIED_ENTRY ||
                  result == Cr.NS_ERROR_SIGNED_JAR_UNSIGNED_ENTRY ||
                  result == Cr.NS_ERROR_SIGNED_JAR_ENTRY_MISSING) {
         throw "APP_PACKAGE_CORRUPTED";
       } else if (result == Cr.NS_ERROR_FILE_CORRUPTED ||
                  result == Cr.NS_ERROR_SIGNED_JAR_ENTRY_TOO_LARGE ||
                  result == Cr.NS_ERROR_SIGNED_JAR_ENTRY_INVALID ||
                  result == Cr.NS_ERROR_SIGNED_JAR_MANIFEST_INVALID) {
         throw "APP_PACKAGE_INVALID";
       } else if ((!aIsLocalFileInstall || isLaterThanBuildTime) &&
                  (result != Cr.NS_ERROR_SIGNED_JAR_NOT_SIGNED)) {
         throw "INVALID_SIGNATURE";
       } else {
         // If it's a localFileInstall and the validation failed
         // because of a expired certificate, just assume it was valid
         // and that the error occurred because the system time has not
         // been set yet.
         isSigned = (aIsLocalFileInstall &&
                     (getNSPRErrorCode(result) ==
                      SEC_ERROR_EXPIRED_CERTIFICATE));
         zipReader = Cc["@mozilla.org/libjar/zip-reader;1"]
                       .createInstance(Ci.nsIZipReader);
         zipReader.open(aZipFile);
       }
       return [zipReader, isSigned];
     }).bind(this));
   },
   _openSignedPackage: function(aInstallOrigin, aManifestURL, aZipFile, aCertDb) {
     let deferred = Promise.defer();
     let root = TrustedRootCertificate.index;
     let useReviewerCerts = false;
     try {
       useReviewerCerts = Services.prefs.
                            getBoolPref("dom.mozApps.use_reviewer_certs");
     } catch (ex) { }
     // We'll use the reviewer and dev certificates only if the pref is set to
     // true.
     if (useReviewerCerts) {
       let manifestPath = Services.io.newURI(aManifestURL, null, null).path;
       switch (aInstallOrigin) {
         case "https://marketplace.firefox.com":
           root = manifestPath.startsWith("/reviewers/")
                ? Ci.nsIX509CertDB.AppMarketplaceProdReviewersRoot
                : Ci.nsIX509CertDB.AppMarketplaceProdPublicRoot;
           break;
         case "https://marketplace-dev.allizom.org":
           root = manifestPath.startsWith("/reviewers/")
                ? Ci.nsIX509CertDB.AppMarketplaceDevReviewersRoot
                : Ci.nsIX509CertDB.AppMarketplaceDevPublicRoot;
           break;
       }
     }
     aCertDb.openSignedAppFileAsync(
        root, aZipFile,
        function(aRv, aZipReader) {
          deferred.resolve([aRv, aZipReader]);
        }
     );
     return deferred.promise;
   },
   _readPackage: function(aOldApp, aNewApp, aIsLocalFileInstall, aIsUpdate,
                          aManifest, aRequestChannel, aHash, aZipReader,
                          aIsSigned) {
     this._checkSignature(aNewApp, aIsSigned, aIsLocalFileInstall);
     if (!aZipReader.hasEntry("manifest.webapp")) {
       throw "MISSING_MANIFEST";
     }
     let istream = aZipReader.getInputStream("manifest.webapp");
     // Obtain a converter to read from a UTF-8 encoded input stream.
     let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
                       .createInstance(Ci.nsIScriptableUnicodeConverter);
     converter.charset = "UTF-8";
     let newManifest = JSON.parse(converter.ConvertToUnicode(
           NetUtil.readInputStreamToString(istream, istream.available()) || ""));
     if (!AppsUtils.checkManifest(newManifest, aOldApp)) {
       throw "INVALID_MANIFEST";
     }
     // For app updates we don't forbid apps to rename themselves but
     // we still retain the old name of the app. In the future we
     // will use UI to allow updates to rename an app after we check
     // with the user that the rename is ok.
     if (aIsUpdate) {
       // Call ensureSameAppName before compareManifests as `manifest`
       // has been normalized to avoid app rename.
       AppsUtils.ensureSameAppName(aManifest._manifest, newManifest, aOldApp);
     }
     if (!AppsUtils.compareManifests(newManifest, aManifest._manifest)) {
       throw "MANIFEST_MISMATCH";
     }
     if (!AppsUtils.checkInstallAllowed(newManifest, aNewApp.installOrigin)) {
       throw "INSTALL_FROM_DENIED";
     }
     // Local file installs can be privileged even without the signature.
     let maxStatus = aIsSigned || aIsLocalFileInstall
                     ? Ci.nsIPrincipal.APP_STATUS_PRIVILEGED
                     : Ci.nsIPrincipal.APP_STATUS_INSTALLED;
     if (AppsUtils.getAppManifestStatus(newManifest) > maxStatus) {
       throw "INVALID_SECURITY_LEVEL";
     }
     aOldApp.appStatus = AppsUtils.getAppManifestStatus(newManifest);
     this._saveEtag(aIsUpdate, aOldApp, aRequestChannel, aHash, newManifest);
     this._checkOrigin(aIsSigned || aIsLocalFileInstall, aOldApp, newManifest,
                       aIsUpdate);
     this._getIds(aIsSigned, aZipReader, converter, aNewApp, aOldApp, aIsUpdate);
     return newManifest;
   },
   _checkSignature: function(aApp, aIsSigned, aIsLocalFileInstall) {
     // XXX Security: You CANNOT safely add a new app store for
     // installing privileged apps just by modifying this pref and
     // adding the signing cert for that store to the cert trust
     // database. *Any* origin listed can install apps signed with
     // *any* certificate trusted; we don't try to maintain a strong
     // association between certificate with installOrign. The
     // expectation here is that in production builds the pref will
     // contain exactly one origin. However, in custom development
     // builds it may contain more than one origin so we can test
     // different stages (dev, staging, prod) of the same app store.
     //
     // Only allow signed apps to be installed from a whitelist of
     // domains, and require all packages installed from any of the
     // domains on the whitelist to be signed. This is a stopgap until
     // we have a real story for handling multiple app stores signing
     // apps.
     let signedAppOriginsStr =
       Services.prefs.getCharPref("dom.mozApps.signed_apps_installable_from");
     // If it's a local install and it's signed then we assume
     // the app origin is a valid signer.
     let isSignedAppOrigin = (aIsSigned && aIsLocalFileInstall) ||
                              signedAppOriginsStr.split(",").
                                    indexOf(aApp.installOrigin) > -1;
     if (!aIsSigned && isSignedAppOrigin) {
       // Packaged apps installed from these origins must be signed;
       // if not, assume somebody stripped the signature.
       throw "INVALID_SIGNATURE";
     } else if (aIsSigned && !isSignedAppOrigin) {
       // Other origins are *prohibited* from installing signed apps.
       // One reason is that our app revocation mechanism requires
       // strong cooperation from the host of the mini-manifest, which
       // we assume to be under the control of the install origin,
       // even if it has a different origin.
       throw "INSTALL_FROM_DENIED";
     }
   },
   _saveEtag: function(aIsUpdate, aOldApp, aRequestChannel, aHash, aManifest) {
     // Save the new Etag for the package.
     if (aIsUpdate) {
       if (!aOldApp.staged) {
         aOldApp.staged = { };
       }
       try {
         aOldApp.staged.packageEtag = aRequestChannel.getResponseHeader("Etag");
       } catch(e) { }
       aOldApp.staged.packageHash = aHash;
       aOldApp.staged.appStatus = AppsUtils.getAppManifestStatus(aManifest);
     } else {
       try {
         aOldApp.packageEtag = aRequestChannel.getResponseHeader("Etag");
       } catch(e) { }
       aOldApp.packageHash = aHash;
       aOldApp.appStatus = AppsUtils.getAppManifestStatus(aManifest);
     }
   },
   _checkOrigin: function(aIsSigned, aOldApp, aManifest, aIsUpdate) {
     // Check if the app declares which origin it will use.
     if (aIsSigned &&
         aOldApp.appStatus >= Ci.nsIPrincipal.APP_STATUS_PRIVILEGED &&
         aManifest.origin !== undefined) {
       let uri;
       try {
         uri = Services.io.newURI(aManifest.origin, null, null);
       } catch(e) {
         throw "INVALID_ORIGIN";
       }
       if (uri.scheme != "app") {
         throw "INVALID_ORIGIN";
       }
       if (aIsUpdate) {
         // Changing the origin during an update is not allowed.
         if (uri.prePath != aOldApp.origin) {
           throw "INVALID_ORIGIN_CHANGE";
         }
         // Nothing else to do for an update... since the
         // origin can't change we don't need to move the
         // app nor can we have a duplicated origin
       } else {
         debug("Setting origin to " + uri.prePath +
               " for " + aOldApp.manifestURL);
         let newId = uri.prePath.substring(6); // "app://".length
         if (newId in this.webapps) {
           throw "DUPLICATE_ORIGIN";
         }
         aOldApp.origin = uri.prePath;
         // Update the registry.
         let oldId = aOldApp.id;
         aOldApp.id = newId;
         this.webapps[newId] = aOldApp;
         delete this.webapps[oldId];
         // Rename the directories where the files are installed.
         [DIRECTORY_NAME, "TmpD"].forEach(function(aDir) {
           let parent = FileUtils.getDir(aDir, ["webapps"], true, true);
           let dir = FileUtils.getDir(aDir, ["webapps", oldId], true, true);
           dir.moveTo(parent, newId);
         });
         // Signals that we need to swap the old id with the new app.
         this.broadcastMessage("Webapps:RemoveApp", { id: oldId });
         this.broadcastMessage("Webapps:AddApp", { id: newId,
                                                   app: aOldApp });
       }
     }
   },
   _getIds: function(aIsSigned, aZipReader, aConverter, aNewApp, aOldApp,
                     aIsUpdate) {
     // Get ids.json if the file is signed
     if (aIsSigned) {
       let idsStream;
       try {
         idsStream = aZipReader.getInputStream("META-INF/ids.json");
       } catch (e) {
         throw aZipReader.hasEntry("META-INF/ids.json")
                ? e
                : "MISSING_IDS_JSON";
       }
       let ids = JSON.parse(aConverter.ConvertToUnicode(NetUtil.
              readInputStreamToString( idsStream, idsStream.available()) || ""));
       if ((!ids.id) || !Number.isInteger(ids.version) ||
           (ids.version <= 0)) {
          throw "INVALID_IDS_JSON";
       }
       let storeId = aNewApp.installOrigin + "#" + ids.id;
       this._checkForStoreIdMatch(aIsUpdate, aOldApp, storeId, ids.version);
       aOldApp.storeId = storeId;
       aOldApp.storeVersion = ids.version;
     }
   },
   // aStoreId must be a string of the form
   //   <installOrigin>#<storeId from ids.json>
   // aStoreVersion must be a positive integer.
   _checkForStoreIdMatch: function(aIsUpdate, aNewApp, aStoreId, aStoreVersion) {
     // Things to check:
     // 1. if it's a update:
     //   a. We should already have this storeId, or the original storeId must
     //      start with STORE_ID_PENDING_PREFIX
     //   b. The manifestURL for the stored app should be the same one we're
     //      updating
     //   c. And finally the version of the update should be higher than the one
     //      on the already installed package
     // 2. else
     //   a. We should not have this storeId on the list
     // We're currently launching WRONG_APP_STORE_ID for all the mismatch kind of
     // errors, and APP_STORE_VERSION_ROLLBACK for the version error.
     // Does an app with this storeID exist already?
     let appId = this.getAppLocalIdByStoreId(aStoreId);
     let isInstalled = appId != Ci.nsIScriptSecurityManager.NO_APP_ID;
     if (aIsUpdate) {
       let isDifferent = aNewApp.localId !== appId;
       let isPending = aNewApp.storeId.indexOf(STORE_ID_PENDING_PREFIX) == 0;
       if ((!isInstalled && !isPending) || (isInstalled && isDifferent)) {
         throw "WRONG_APP_STORE_ID";
       }
       if (!isPending && (aNewApp.storeVersion >= aStoreVersion)) {
         throw "APP_STORE_VERSION_ROLLBACK";
       }
     } else if (isInstalled) {
       throw "WRONG_APP_STORE_ID";
     }
   },
   // Removes the directory we created, and sends an error to the DOM side.
   _revertDownloadPackage: function(aId, aOldApp, aNewApp, aIsUpdate, aError) {
     debug("Cleanup: " + aError + "\n" + aError.stack);
     let dir = FileUtils.getDir("TmpD", ["webapps", aId], true, true);
     try {
       dir.remove(true);
     } catch (e) { }
     // We avoid notifying the error to the DOM side if the app download
     // was cancelled via cancelDownload, which already sends its own
     // notification.
     if (aOldApp.isCanceling) {
       delete aOldApp.isCanceling;
       return;
     }
     let download = AppDownloadManager.get(aNewApp.manifestURL);
     aOldApp.downloading = false;
     // If there were not enough storage to download the package we
     // won't have a record of the download details, so we just set the
     // installState to 'pending' at first download and to 'installed' when
     // updating.
     aOldApp.installState = download ? download.previousState
                                     : aIsUpdate ? "installed"
                                                 : "pending";
     if (aOldApp.staged) {
       delete aOldApp.staged;
     }
     this._saveApps().then(() => {
       this.broadcastMessage("Webapps:UpdateState", {
         app: aOldApp,
         error: aError,
         manifestURL: aNewApp.manifestURL
       });
       this.broadcastMessage("Webapps:FireEvent", {
         eventType: "downloaderror",
         manifestURL:  aNewApp.manifestURL
       });
     });
     AppDownloadManager.remove(aNewApp.manifestURL);
   },
   doUninstall: function(aData, aMm) {
     this.uninstall(aData.manifestURL,
       function onsuccess() {
         aMm.sendAsyncMessage("Webapps:Uninstall:Return:OK", aData);
       },
       function onfailure() {
         // Fall-through, fails to uninstall the desired app because:
         //   - we cannot find the app to be uninstalled.
         //   - the app to be uninstalled is not removable.
         aMm.sendAsyncMessage("Webapps:Uninstall:Return:KO", aData);
       }
     );
   },
   uninstall: function(aManifestURL, aOnSuccess, aOnFailure) {
     debug("uninstall " + aManifestURL);
     let app = this.getAppByManifestURL(aManifestURL);
     if (!app) {
       aOnFailure("NO_SUCH_APP");
       return;
     }
     let id = app.id;
     if (!app.removable) {
       debug("Error: cannot uninstall a non-removable app.");
       aOnFailure("NON_REMOVABLE_APP");
       return;
     }
     // Check if we are downloading something for this app, and cancel the
     // download if needed.
     this.cancelDownload(app.manifestURL);
     // Clean up the deprecated manifest cache if needed.
     if (id in this._manifestCache) {
       delete this._manifestCache[id];
     }
     // Clear private data first.
     this._clearPrivateData(app.localId, false);
     // Then notify observers.
     // We have to clone the app object as nsIDOMApplication objects are
     // stringified as an empty object. (see bug 830376)
     let appClone = AppsUtils.cloneAppObject(app);
     Services.obs.notifyObservers(null, "webapps-uninstall", JSON.stringify(appClone));
     if (supportSystemMessages()) {
       this._readManifests([{ id: id }]).then((aResult) => {
         this._unregisterActivities(aResult[0].manifest, app);
       });
     }
     let dir = this._getAppDir(id);
     try {
       dir.remove(true);
     } catch (e) {}
     delete this.webapps[id];
     this._saveApps().then(() => {
       this.broadcastMessage("Webapps:Uninstall:Broadcast:Return:OK", appClone);
       // Catch exception on callback call to ensure notifying observers after
       try {
         if (aOnSuccess) {
           aOnSuccess();
         }
       } catch(ex) {
         Cu.reportError("DOMApplicationRegistry: Exception on app uninstall: " +
                        ex + "\n" + ex.stack);
       }
       this.broadcastMessage("Webapps:RemoveApp", { id: id });
     });
   },
   getSelf: function(aData, aMm) {
     aData.apps = [];
     if (aData.appId == Ci.nsIScriptSecurityManager.NO_APP_ID ||
         aData.appId == Ci.nsIScriptSecurityManager.UNKNOWN_APP_ID) {
       aMm.sendAsyncMessage("Webapps:GetSelf:Return:OK", aData);
       return;
     }
     let tmp = [];
     for (let id in this.webapps) {
       if (this.webapps[id].origin == aData.origin &&
           this.webapps[id].localId == aData.appId &&
           this._isLaunchable(this.webapps[id])) {
         let app = AppsUtils.cloneAppObject(this.webapps[id]);
         aData.apps.push(app);
         tmp.push({ id: id });
         break;
       }
     }
     if (!aData.apps.length) {
       aMm.sendAsyncMessage("Webapps:GetSelf:Return:OK", aData);
       return;
     }
     this._readManifests(tmp).then((aResult) => {
       for (let i = 0; i < aResult.length; i++)
         aData.apps[i].manifest = aResult[i].manifest;
       aMm.sendAsyncMessage("Webapps:GetSelf:Return:OK", aData);
     });
   },
   checkInstalled: function(aData, aMm) {
     aData.app = null;
     let tmp = [];
     for (let appId in this.webapps) {
       if (this.webapps[appId].manifestURL == aData.manifestURL &&
           this._isLaunchable(this.webapps[appId])) {
         aData.app = AppsUtils.cloneAppObject(this.webapps[appId]);
         tmp.push({ id: appId });
         break;
       }
     }
     this._readManifests(tmp).then((aResult) => {
       for (let i = 0; i < aResult.length; i++) {
         aData.app.manifest = aResult[i].manifest;
         break;
       }
       aMm.sendAsyncMessage("Webapps:CheckInstalled:Return:OK", aData);
     });
   },
   getInstalled: function(aData, aMm) {
     aData.apps = [];
     let tmp = [];
     for (let id in this.webapps) {
       if (this.webapps[id].installOrigin == aData.origin &&
           this._isLaunchable(this.webapps[id])) {
         aData.apps.push(AppsUtils.cloneAppObject(this.webapps[id]));
         tmp.push({ id: id });
       }
     }
     this._readManifests(tmp).then((aResult) => {
       for (let i = 0; i < aResult.length; i++)
         aData.apps[i].manifest = aResult[i].manifest;
       aMm.sendAsyncMessage("Webapps:GetInstalled:Return:OK", aData);
     });
   },
   getNotInstalled: function(aData, aMm) {
     aData.apps = [];
     let tmp = [];
     for (let id in this.webapps) {
       if (!this._isLaunchable(this.webapps[id])) {
         aData.apps.push(AppsUtils.cloneAppObject(this.webapps[id]));
         tmp.push({ id: id });
       }
     }
     this._readManifests(tmp).then((aResult) => {
       for (let i = 0; i < aResult.length; i++)
         aData.apps[i].manifest = aResult[i].manifest;
       aMm.sendAsyncMessage("Webapps:GetNotInstalled:Return:OK", aData);
     });
   },
   doGetAll: function(aData, aMm) {
     this.getAll(function (apps) {
       aData.apps = apps;
       aMm.sendAsyncMessage("Webapps:GetAll:Return:OK", aData);
     });
   },
   getAll: function(aCallback) {
     debug("getAll");
     let apps = [];
     let tmp = [];
     for (let id in this.webapps) {
       let app = AppsUtils.cloneAppObject(this.webapps[id]);
       if (!this._isLaunchable(app))
         continue;
       apps.push(app);
       tmp.push({ id: id });
     }
     this._readManifests(tmp).then((aResult) => {
       for (let i = 0; i < aResult.length; i++)
         apps[i].manifest = aResult[i].manifest;
       aCallback(apps);
     });
   },
   /* Check if |data| is actually a receipt */
   isReceipt: function(data) {
     try {
       // The receipt data shouldn't be too big (allow up to 1 MiB of data)
       const MAX_RECEIPT_SIZE = 1048576;
       if (data.length > MAX_RECEIPT_SIZE) {
         return "RECEIPT_TOO_BIG";
       }
       // Marketplace receipts are JWK + "~" + JWT
       // Other receipts may contain only the JWT
       let receiptParts = data.split('~');
       let jwtData = null;
       if (receiptParts.length == 2) {
         jwtData = receiptParts[1];
       } else {
         jwtData = receiptParts[0];
       }
       let segments = jwtData.split('.');
       if (segments.length != 3) {
         return "INVALID_SEGMENTS_NUMBER";
       }
       // We need to translate the base64 alphabet used in JWT to our base64 alphabet
       // before calling atob.
       let decodedReceipt = JSON.parse(atob(segments[1].replace(/-/g, '+')
                                                       .replace(/_/g, '/')));
       if (!decodedReceipt) {
         return "INVALID_RECEIPT_ENCODING";
       }
       // Required values for a receipt
       if (!decodedReceipt.typ) {
         return "RECEIPT_TYPE_REQUIRED";
       }
       if (!decodedReceipt.product) {
         return "RECEIPT_PRODUCT_REQUIRED";
       }
       if (!decodedReceipt.user) {
         return "RECEIPT_USER_REQUIRED";
       }
       if (!decodedReceipt.iss) {
         return "RECEIPT_ISS_REQUIRED";
       }
       if (!decodedReceipt.nbf) {
         return "RECEIPT_NBF_REQUIRED";
       }
       if (!decodedReceipt.iat) {
         return "RECEIPT_IAT_REQUIRED";
       }
       let allowedTypes = [ "purchase-receipt", "developer-receipt",
                            "reviewer-receipt", "test-receipt" ];
       if (allowedTypes.indexOf(decodedReceipt.typ) < 0) {
         return "RECEIPT_TYPE_UNSUPPORTED";
       }
     } catch (e) {
       return "RECEIPT_ERROR";
     }
     return null;
   },
   addReceipt: function(aData, aMm) {
     debug("addReceipt " + aData.manifestURL);
     let receipt = aData.receipt;
     if (!receipt) {
       aData.error = "INVALID_PARAMETERS";
       aMm.sendAsyncMessage("Webapps:AddReceipt:Return:KO", aData);
       return;
     }
     let error = this.isReceipt(receipt);
     if (error) {
       aData.error = error;
       aMm.sendAsyncMessage("Webapps:AddReceipt:Return:KO", aData);
       return;
     }
     let id = this._appIdForManifestURL(aData.manifestURL);
     let app = this.webapps[id];
     if (!app.receipts) {
       app.receipts = [];
     } else if (app.receipts.length > 500) {
       aData.error = "TOO_MANY_RECEIPTS";
       aMm.sendAsyncMessage("Webapps:AddReceipt:Return:KO", aData);
       return;
     }
     let index = app.receipts.indexOf(receipt);
     if (index >= 0) {
       aData.error = "RECEIPT_ALREADY_EXISTS";
       aMm.sendAsyncMessage("Webapps:AddReceipt:Return:KO", aData);
       return;
     }
     app.receipts.push(receipt);
     this._saveApps().then(() => {
       aData.receipts = app.receipts;
       aMm.sendAsyncMessage("Webapps:AddReceipt:Return:OK", aData);
     });
   },
   removeReceipt: function(aData, aMm) {
     debug("removeReceipt " + aData.manifestURL);
     let receipt = aData.receipt;
     if (!receipt) {
       aData.error = "INVALID_PARAMETERS";
       aMm.sendAsyncMessage("Webapps:RemoveReceipt:Return:KO", aData);
       return;
     }
     let id = this._appIdForManifestURL(aData.manifestURL);
     let app = this.webapps[id];
     if (!app.receipts) {
       aData.error = "NO_SUCH_RECEIPT";
       aMm.sendAsyncMessage("Webapps:RemoveReceipt:Return:KO", aData);
       return;
     }
     let index = app.receipts.indexOf(receipt);
     if (index == -1) {
       aData.error = "NO_SUCH_RECEIPT";
       aMm.sendAsyncMessage("Webapps:RemoveReceipt:Return:KO", aData);
       return;
     }
     app.receipts.splice(index, 1);
     this._saveApps().then(() => {
       aData.receipts = app.receipts;
       aMm.sendAsyncMessage("Webapps:RemoveReceipt:Return:OK", aData);
     });
   },
   replaceReceipt: function(aData, aMm) {
     debug("replaceReceipt " + aData.manifestURL);
     let oldReceipt = aData.oldReceipt;
     let newReceipt = aData.newReceipt;
     if (!oldReceipt || !newReceipt) {
       aData.error = "INVALID_PARAMETERS";
       aMm.sendAsyncMessage("Webapps:ReplaceReceipt:Return:KO", aData);
       return;
     }
     let error = this.isReceipt(newReceipt);
     if (error) {
       aData.error = error;
       aMm.sendAsyncMessage("Webapps:ReplaceReceipt:Return:KO", aData);
       return;
     }
     let id = this._appIdForManifestURL(aData.manifestURL);
     let app = this.webapps[id];
     if (!app.receipts) {
       aData.error = "NO_SUCH_RECEIPT";
       aMm.sendAsyncMessage("Webapps:RemoveReceipt:Return:KO", aData);
       return;
     }
     let oldIndex = app.receipts.indexOf(oldReceipt);
     if (oldIndex == -1) {
       aData.error = "NO_SUCH_RECEIPT";
       aMm.sendAsyncMessage("Webapps:ReplaceReceipt:Return:KO", aData);
       return;
     }
     app.receipts[oldIndex] = newReceipt;
     this._saveApps().then(() => {
       aData.receipts = app.receipts;
       aMm.sendAsyncMessage("Webapps:ReplaceReceipt:Return:OK", aData);
     });
   },
   getManifestFor: function(aManifestURL) {
     let id = this._appIdForManifestURL(aManifestURL);
     let app = this.webapps[id];
     if (!id || (app.installState == "pending" && !app.retryingDownload)) {
       return Promise.resolve(null);
     }
     return this._readManifests([{ id: id }]).then((aResult) => {
       return aResult[0].manifest;
     });
   },
   getAppByManifestURL: function(aManifestURL) {
     return AppsUtils.getAppByManifestURL(this.webapps, aManifestURL);
   },
   getCSPByLocalId: function(aLocalId) {
     debug("getCSPByLocalId:" + aLocalId);
     return AppsUtils.getCSPByLocalId(this.webapps, aLocalId);
   },
   getAppLocalIdByStoreId: function(aStoreId) {
     debug("getAppLocalIdByStoreId:" + aStoreId);
     return AppsUtils.getAppLocalIdByStoreId(this.webapps, aStoreId);
   },
   getAppByLocalId: function(aLocalId) {
     return AppsUtils.getAppByLocalId(this.webapps, aLocalId);
   },
   getManifestURLByLocalId: function(aLocalId) {
     return AppsUtils.getManifestURLByLocalId(this.webapps, aLocalId);
   },
   getAppLocalIdByManifestURL: function(aManifestURL) {
     return AppsUtils.getAppLocalIdByManifestURL(this.webapps, aManifestURL);
   },
   getCoreAppsBasePath: function() {
     return AppsUtils.getCoreAppsBasePath();
   },
   getWebAppsBasePath: function() {
     return OS.Path.dirname(this.appsFile);
   },
   _isLaunchable: function(aApp) {
     if (this.allAppsLaunchable)
       return true;
     return WebappOSUtils.isLaunchable(aApp);
   },
   _notifyCategoryAndObservers: function(subject, topic, data,  msg) {
     const serviceMarker = "service,";
     // First create observers from the category manager.
     let cm =
       Cc["@mozilla.org/categorymanager;1"].getService(Ci.nsICategoryManager);
     let enumerator = cm.enumerateCategory(topic);
     let observers = [];
     while (enumerator.hasMoreElements()) {
       let entry =
         enumerator.getNext().QueryInterface(Ci.nsISupportsCString).data;
       let contractID = cm.getCategoryEntry(topic, entry);
       let factoryFunction;
       if (contractID.substring(0, serviceMarker.length) == serviceMarker) {
         contractID = contractID.substring(serviceMarker.length);
         factoryFunction = "getService";
       }
       else {
         factoryFunction = "createInstance";
       }
       try {
         let handler = Cc[contractID][factoryFunction]();
         if (handler) {
           let observer = handler.QueryInterface(Ci.nsIObserver);
           observers.push(observer);
         }
       } catch(e) { }
     }
     // Next enumerate the registered observers.
     enumerator = Services.obs.enumerateObservers(topic);
     while (enumerator.hasMoreElements()) {
       try {
         let observer = enumerator.getNext().QueryInterface(Ci.nsIObserver);
         if (observers.indexOf(observer) == -1) {
           observers.push(observer);
         }
       } catch (e) { }
     }
     observers.forEach(function (observer) {
       try {
         observer.observe(subject, topic, data);
       } catch(e) { }
     });
     // Send back an answer to the child.
     if (msg) {
       ppmm.broadcastAsyncMessage("Webapps:ClearBrowserData:Return", msg);
     }
   },
   registerBrowserElementParentForApp: function(bep, appId) {
     let mm = bep._mm;
     // Make a listener function that holds on to this appId.
     let listener = this.receiveAppMessage.bind(this, appId);
     this.frameMessages.forEach(function(msgName) {
       mm.addMessageListener(msgName, listener);
     });
   },
   receiveAppMessage: function(appId, message) {
     switch (message.name) {
       case "Webapps:ClearBrowserData":
         this._clearPrivateData(appId, true, message.data);
         break;
     }
   },
   _clearPrivateData: function(appId, browserOnly, msg) {
     let subject = {
       appId: appId,
       browserOnly: browserOnly,
       QueryInterface: XPCOMUtils.generateQI([Ci.mozIApplicationClearPrivateDataParams])
     };
     this._notifyCategoryAndObservers(subject, "webapps-clear-data", null, msg);
   }
 };
 /**
  * Appcache download observer
  */
 let AppcacheObserver = function(aApp) {
   debug("Creating AppcacheObserver for " + aApp.origin +
         " - " + aApp.installState);
   this.app = aApp;
   this.startStatus = aApp.installState;
   this.lastProgressTime = 0;
   // Send a first progress event to correctly set the DOM object's properties.
   this._sendProgressEvent();
 };
 AppcacheObserver.prototype = {
   // nsIOfflineCacheUpdateObserver implementation
   _sendProgressEvent: function() {
     let app = this.app;
     DOMApplicationRegistry.broadcastMessage("Webapps:UpdateState", {
       app: app,
       manifestURL: app.manifestURL
     });
     DOMApplicationRegistry.broadcastMessage("Webapps:FireEvent", {
       eventType: "progress",
       manifestURL: app.manifestURL
     });
   },
   updateStateChanged: function appObs_Update(aUpdate, aState) {
     let mustSave = false;
     let app = this.app;
     debug("Offline cache state change for " + app.origin + " : " + aState);
     var self = this;
     let setStatus = function appObs_setStatus(aStatus, aProgress) {
       debug("Offlinecache setStatus to " + aStatus + " with progress " +
             aProgress + " for " + app.origin);
       mustSave = (app.installState != aStatus);
       app.installState = aStatus;
       app.progress = aProgress;
       if (aStatus != "installed") {
         self._sendProgressEvent();
         return;
       }
       app.updateTime = Date.now();
       app.downloading = false;
       app.downloadAvailable = false;
       DOMApplicationRegistry.broadcastMessage("Webapps:UpdateState", {
         app: app,
         manifestURL: app.manifestURL
       });
       DOMApplicationRegistry.broadcastMessage("Webapps:FireEvent", {
         eventType: ["downloadsuccess", "downloadapplied"],
         manifestURL: app.manifestURL
       });
     }
     let setError = function appObs_setError(aError) {
       debug("Offlinecache setError to " + aError);
       app.downloading = false;
       DOMApplicationRegistry.broadcastMessage("Webapps:UpdateState", {
         app: app,
         manifestURL: app.manifestURL
       });
       DOMApplicationRegistry.broadcastMessage("Webapps:FireEvent", {
         error: aError,
         eventType: "downloaderror",
         manifestURL: app.manifestURL
       });
       mustSave = true;
     }
     switch (aState) {
       case Ci.nsIOfflineCacheUpdateObserver.STATE_ERROR:
         aUpdate.removeObserver(this);
         AppDownloadManager.remove(app.manifestURL);
         setError("APP_CACHE_DOWNLOAD_ERROR");
         break;
       case Ci.nsIOfflineCacheUpdateObserver.STATE_NOUPDATE:
       case Ci.nsIOfflineCacheUpdateObserver.STATE_FINISHED:
         aUpdate.removeObserver(this);
         AppDownloadManager.remove(app.manifestURL);
         setStatus("installed", aUpdate.byteProgress);
         break;
       case Ci.nsIOfflineCacheUpdateObserver.STATE_DOWNLOADING:
         setStatus(this.startStatus, aUpdate.byteProgress);
         break;
       case Ci.nsIOfflineCacheUpdateObserver.STATE_ITEMSTARTED:
       case Ci.nsIOfflineCacheUpdateObserver.STATE_ITEMPROGRESS:
         let now = Date.now();
         if (now - this.lastProgressTime > MIN_PROGRESS_EVENT_DELAY) {
           setStatus(this.startStatus, aUpdate.byteProgress);
           this.lastProgressTime = now;
         }
         break;
     }
     // Status changed, update the stored version.
     if (mustSave) {
       DOMApplicationRegistry._saveApps();
     }
   },
   applicationCacheAvailable: function appObs_CacheAvail(aApplicationCache) {
     // Nothing to do.
   }
 };
 DOMApplicationRegistry.init();

The Tor Browser / annotate

dom/apps/src/Webapps.jsm@7e26c7da4463 (annotated)

dom/apps/src/Webapps.jsm