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nsSessionStartup.js
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the nsSessionStore component.
*
* The Initial Developer of the Original Code is
* Simon B├╝nzli <zeniko@gmail.com>
*
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Dietrich Ayala <autonome@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/**
* Session Storage and Restoration
*
* Overview
* This service reads user's session file at startup, and makes a determination
* as to whether the session should be restored. It will restore the session
* under the circumstances described below.
*
* Crash Detection
* The session file stores a session.state property, that
* indicates whether the browser is currently running. When the browser shuts
* down, the field is changed to "stopped". At startup, this field is read, and
* if it's value is "running", then it's assumed that the browser had previously
* crashed, or at the very least that something bad happened, and that we should
* restore the session.
*
* Forced Restarts
* In the event that a restart is required due to application update or extension
* installation, set the browser.sessionstore.resume_session_once pref to true,
* and the session will be restored the next time the browser starts.
*
* Always Resume
* This service will always resume the session if the integer pref
* browser.startup.page is set to 3.
*/
/* :::::::: Constants and Helpers ::::::::::::::: */
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const CID = Components.ID("{ec7a6c20-e081-11da-8ad9-0800200c9a66}");
const CONTRACT_ID = "@mozilla.org/browser/sessionstartup;1";
const CLASS_NAME = "Browser Session Startup Service";
const STATE_RUNNING_STR = "running";
/* :::::::: Pref Defaults :::::::::::::::::::: */
// whether the service is enabled
const DEFAULT_ENABLED = true;
// resume the current session at startup just this once
const DEFAULT_RESUME_SESSION_ONCE = false;
// resume the current session at startup if it had previously crashed
const DEFAULT_RESUME_FROM_CRASH = true;
function debug(aMsg) {
aMsg = ("SessionStartup: " + aMsg).replace(/\S{80}/g, "$&\n");
Cc["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService)
.logStringMessage(aMsg);
}
/* :::::::: The Service ::::::::::::::: */
function SessionStartup() {
}
SessionStartup.prototype = {
// the state to restore at startup
_iniString: null,
/* ........ Global Event Handlers .............. */
/**
* Initialize the component
*/
init: function sss_init() {
this._prefBranch = Cc["@mozilla.org/preferences-service;1"].
getService(Ci.nsIPrefService).
getBranch("browser.");
this._prefBranch.QueryInterface(Ci.nsIPrefBranch2);
// if the service is disabled, do not init
if (!this._getPref("sessionstore.enabled", DEFAULT_ENABLED))
return;
// get file references
var dirService = Cc["@mozilla.org/file/directory_service;1"].
getService(Ci.nsIProperties);
this._sessionFile = dirService.get("ProfD", Ci.nsILocalFile);
this._sessionFile.append("sessionstore.js");
// only read the session file if config allows possibility of restoring
var resumeFromCrash = this._getPref("sessionstore.resume_from_crash", DEFAULT_RESUME_FROM_CRASH);
if (resumeFromCrash || this._doResumeSession()) {
// get string containing session state
this._iniString = this._readFile(this._sessionFile);
if (this._iniString) {
try {
// parse the session state into JS objects
var s = new Components.utils.Sandbox("about:blank");
var initialState = Components.utils.evalInSandbox(this._iniString, s);
// set bool detecting crash
this._lastSessionCrashed =
initialState.session && initialState.session.state &&
initialState.session.state == STATE_RUNNING_STR;
// invalid .INI file - nothing can be restored
}
catch (ex) { debug("The session file is invalid: " + ex); }
}
}
// prompt and check prefs
this._doRestore = this._lastSessionCrashed ? this._doRecoverSession() : this._doResumeSession();
if (this._iniString && !this._doRestore) {
this._iniString = null; // reset the state string
}
if (this._getPref("sessionstore.resume_session_once", DEFAULT_RESUME_SESSION_ONCE)) {
this._prefBranch.setBoolPref("sessionstore.resume_session_once", false);
}
if (this.doRestore()) {
// wait for the first browser window to open
var observerService = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
observerService.addObserver(this, "domwindowopened", true);
}
},
/**
* Handle notifications
*/
observe: function sss_observe(aSubject, aTopic, aData) {
var observerService = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
switch (aTopic) {
case "app-startup":
observerService.addObserver(this, "final-ui-startup", true);
break;
case "final-ui-startup":
observerService.removeObserver(this, "final-ui-startup");
this.init();
break;
case "domwindowopened":
var window = aSubject;
var self = this;
window.addEventListener("load", function() {
self._onWindowOpened(window);
window.removeEventListener("load", arguments.callee, false);
}, false);
break;
}
},
/**
* Removes the default arguments from the first browser window
* (and removes the "domwindowopened" observer afterwards).
*/
_onWindowOpened: function sss_onWindowOpened(aWindow) {
var wType = aWindow.document.documentElement.getAttribute("windowtype");
if (wType != "navigator:browser")
return;
/**
* Note: this relies on the fact that nsBrowserContentHandler will return
* a different value the first time it's getter is called after an update,
* due to its needHomePageOverride() logic. We don't want to remove the
* default arguments in the update case, since they include the "What's
* New" page.
*
* Since we're garanteed to be at least the second caller of defaultArgs
* (nsBrowserContentHandler calls it to determine which arguments to pass
* at startup), we know that if the window's arguments don't match the
* current defaultArguments, we're either in the update case, or we're
* launching a non-default browser window, so we shouldn't remove the
* window's arguments.
*/
var defaultArgs = Cc["@mozilla.org/browser/clh;1"].
getService(Ci.nsIBrowserHandler).defaultArgs;
if (aWindow.arguments && aWindow.arguments[0] &&
aWindow.arguments[0] == defaultArgs)
aWindow.arguments[0] = null;
var observerService = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
observerService.removeObserver(this, "domwindowopened");
},
/* ........ Public API ................*/
/**
* Get the session state as a string
*/
get state() {
return this._iniString;
},
/**
* Determine whether there is a pending session restore.
* @returns bool
*/
doRestore: function sss_doRestore() {
return this._doRestore && this._iniString != null;
},
/* ........ Auxiliary Functions .............. */
/**
* Whether or not to resume session, if not recovering from a crash.
* @returns bool
*/
_doResumeSession: function sss_doResumeSession() {
return this._getPref("startup.page", 1) == 3 ||
this._getPref("sessionstore.resume_session_once", DEFAULT_RESUME_SESSION_ONCE);
},
/**
* prompt user whether or not to restore the previous session,
* if the browser crashed
* @returns bool
*/
_doRecoverSession: function sss_doRecoverSession() {
// do not prompt or resume, post-crash
if (!this._getPref("sessionstore.resume_from_crash", DEFAULT_RESUME_FROM_CRASH))
return false;
// if the prompt fails, recover anyway
var recover = true;
// allow extensions to hook in a more elaborate restore prompt
// XXXzeniko drop this when we're using our own dialog instead of a standard prompt
var dialogURI = this._getPref("sessionstore.restore_prompt_uri");
var nativeApp = Components.classes["@mozilla.org/toolkit/native-app-support;1"]
.getService(Components.interfaces.nsINativeAppSupport);
nativeApp.hideSplashScreen();
try {
if (dialogURI) { // extension provided dialog
var params = Cc["@mozilla.org/embedcomp/dialogparam;1"].
createInstance(Ci.nsIDialogParamBlock);
// default to recovering
params.SetInt(0, 0);
Cc["@mozilla.org/embedcomp/window-watcher;1"].
getService(Ci.nsIWindowWatcher).
openWindow(null, dialogURI, "_blank",
"chrome,modal,centerscreen,titlebar", params);
recover = params.GetInt(0) == 0;
}
else { // basic prompt with no options
// get app name from branding properties
var brandStringBundle = this._getStringBundle("chrome://branding/locale/brand.properties");
var brandShortName = brandStringBundle.GetStringFromName("brandShortName");
// create prompt strings
var ssStringBundle = this._getStringBundle("chrome://browser/locale/sessionstore.properties");
var restoreTitle = ssStringBundle.formatStringFromName("restoredTitle", [brandShortName], 1);
var restoreText = ssStringBundle.formatStringFromName("restoredMsg", [brandShortName], 1);
var buttonTitle = ssStringBundle.GetStringFromName("buttonTitle");
var cancelTitle = ssStringBundle.GetStringFromName("cancelTitle");
var promptService = Cc["@mozilla.org/embedcomp/prompt-service;1"].
getService(Ci.nsIPromptService);
// set the buttons that will appear on the dialog
var flags = promptService.BUTTON_TITLE_IS_STRING * promptService.BUTTON_POS_0 +
promptService.BUTTON_TITLE_IS_STRING * promptService.BUTTON_POS_1 +
promptService.BUTTON_POS_0_DEFAULT;
var buttonChoice = promptService.confirmEx(null, restoreTitle, restoreText,
flags, buttonTitle, cancelTitle, null,
null, {});
recover = (buttonChoice == 0);
}
}
catch (ex) { dump(ex + "\n"); } // if the prompt fails, recover anyway
nativeApp.showSplashScreen();
return recover;
},
/**
* Convenience method to get localized string bundles
* @param aURI
* @returns nsIStringBundle
*/
_getStringBundle: function sss_getStringBundle(aURI) {
var bundleService = Cc["@mozilla.org/intl/stringbundle;1"].
getService(Ci.nsIStringBundleService);
var appLocale = Cc["@mozilla.org/intl/nslocaleservice;1"].
getService(Ci.nsILocaleService).getApplicationLocale();
return bundleService.createBundle(aURI, appLocale);
},
/* ........ Storage API .............. */
/**
* basic pref reader
* @param aName
* @param aDefault
* @param aUseRootBranch
*/
_getPref: function sss_getPref(aName, aDefault) {
var pb = this._prefBranch;
try {
switch (pb.getPrefType(aName)) {
case pb.PREF_STRING:
return pb.getCharPref(aName);
case pb.PREF_BOOL:
return pb.getBoolPref(aName);
case pb.PREF_INT:
return pb.getIntPref(aName);
default:
return aDefault;
}
}
catch(ex) {
return aDefault;
}
},
/**
* reads a file into a string
* @param aFile
* nsIFile
* @returns string
*/
_readFile: function sss_readFile(aFile) {
try {
var stream = Cc["@mozilla.org/network/file-input-stream;1"].
createInstance(Ci.nsIFileInputStream);
stream.init(aFile, 0x01, 0, 0);
var cvstream = Cc["@mozilla.org/intl/converter-input-stream;1"].
createInstance(Ci.nsIConverterInputStream);
cvstream.init(stream, "UTF-8", 1024, Ci.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER);
var content = "";
var data = {};
while (cvstream.readString(4096, data)) {
content += data.value;
}
cvstream.close();
return content.replace(/\r\n?/g, "\n");
}
catch (ex) { } // inexisting file?
return null;
},
/* ........ QueryInterface .............. */
QueryInterface: function(aIID) {
if (!aIID.equals(Ci.nsISupports) && !aIID.equals(Ci.nsIObserver) &&
!aIID.equals(Ci.nsISupportsWeakReference) &&
!aIID.equals(Ci.nsISessionStartup)) {
Components.returnCode = Cr.NS_ERROR_NO_INTERFACE;
return null;
}
return this;
}
};
/* :::::::: Service Registration & Initialization ::::::::::::::: */
/* ........ nsIModule .............. */
const SessionStartupModule = {
getClassObject: function(aCompMgr, aCID, aIID) {
if (aCID.equals(CID)) {
return SessionStartupFactory;
}
Components.returnCode = Cr.NS_ERROR_NOT_REGISTERED;
return null;
},
registerSelf: function(aCompMgr, aFileSpec, aLocation, aType) {
aCompMgr.QueryInterface(Ci.nsIComponentRegistrar);
aCompMgr.registerFactoryLocation(CID, CLASS_NAME, CONTRACT_ID, aFileSpec, aLocation, aType);
var catMan = Cc["@mozilla.org/categorymanager;1"].
getService(Ci.nsICategoryManager);
catMan.addCategoryEntry("app-startup", CLASS_NAME, "service," + CONTRACT_ID, true, true);
},
unregisterSelf: function(aCompMgr, aLocation, aType) {
aCompMgr.QueryInterface(Ci.nsIComponentRegistrar);
aCompMgr.unregisterFactoryLocation(CID, aLocation);
var catMan = Cc["@mozilla.org/categorymanager;1"].
getService(Ci.nsICategoryManager);
catMan.deleteCategoryEntry( "app-startup", "service," + CONTRACT_ID, true);
},
canUnload: function(aCompMgr) {
return true;
}
}
/* ........ nsIFactory .............. */
const SessionStartupFactory = {
createInstance: function(aOuter, aIID) {
if (aOuter != null) {
Components.returnCode = Cr.NS_ERROR_NO_AGGREGATION;
return null;
}
return (new SessionStartup()).QueryInterface(aIID);
},
lockFactory: function(aLock) { },
QueryInterface: function(aIID) {
if (!aIID.equals(Ci.nsISupports) && !aIID.equals(Ci.nsIModule) &&
!aIID.equals(Ci.nsIFactory) && !aIID.equals(Ci.nsISessionStartup)) {
Components.returnCode = Cr.NS_ERROR_NO_INTERFACE;
return null;
}
return this;
}
};
function NSGetModule(aComMgr, aFileSpec) {
return SessionStartupModule;
}