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Diffstat (limited to 'browser/components/sessionstore/SessionStore.jsm')
| -rw-r--r-- | browser/components/sessionstore/SessionStore.jsm | 4719 |
1 files changed, 4719 insertions, 0 deletions
diff --git a/browser/components/sessionstore/SessionStore.jsm b/browser/components/sessionstore/SessionStore.jsm new file mode 100644 index 000000000..2f44b2af3 --- /dev/null +++ b/browser/components/sessionstore/SessionStore.jsm @@ -0,0 +1,4719 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +"use strict"; + +this.EXPORTED_SYMBOLS = ["SessionStore"]; + +const Cu = Components.utils; +const Cc = Components.classes; +const Ci = Components.interfaces; +const Cr = Components.results; + +// Current version of the format used by Session Restore. +const FORMAT_VERSION = 1; + +const TAB_STATE_NEEDS_RESTORE = 1; +const TAB_STATE_RESTORING = 2; +const TAB_STATE_WILL_RESTORE = 3; + +// A new window has just been restored. At this stage, tabs are generally +// not restored. +const NOTIFY_SINGLE_WINDOW_RESTORED = "sessionstore-single-window-restored"; +const NOTIFY_WINDOWS_RESTORED = "sessionstore-windows-restored"; +const NOTIFY_BROWSER_STATE_RESTORED = "sessionstore-browser-state-restored"; +const NOTIFY_LAST_SESSION_CLEARED = "sessionstore-last-session-cleared"; +const NOTIFY_RESTORING_ON_STARTUP = "sessionstore-restoring-on-startup"; +const NOTIFY_INITIATING_MANUAL_RESTORE = "sessionstore-initiating-manual-restore"; + +const NOTIFY_TAB_RESTORED = "sessionstore-debug-tab-restored"; // WARNING: debug-only + +// Maximum number of tabs to restore simultaneously. Previously controlled by +// the browser.sessionstore.max_concurrent_tabs pref. +const MAX_CONCURRENT_TAB_RESTORES = 3; + +// Amount (in CSS px) by which we allow window edges to be off-screen +// when restoring a window, before we override the saved position to +// pull the window back within the available screen area. +const SCREEN_EDGE_SLOP = 8; + +// global notifications observed +const OBSERVING = [ + "browser-window-before-show", "domwindowclosed", + "quit-application-granted", "browser-lastwindow-close-granted", + "quit-application", "browser:purge-session-history", + "browser:purge-domain-data", + "idle-daily", +]; + +// XUL Window properties to (re)store +// Restored in restoreDimensions() +const WINDOW_ATTRIBUTES = ["width", "height", "screenX", "screenY", "sizemode"]; + +// Hideable window features to (re)store +// Restored in restoreWindowFeatures() +const WINDOW_HIDEABLE_FEATURES = [ + "menubar", "toolbar", "locationbar", "personalbar", "statusbar", "scrollbars" +]; + +// Messages that will be received via the Frame Message Manager. +const MESSAGES = [ + // The content script sends us data that has been invalidated and needs to + // be saved to disk. + "SessionStore:update", + + // The restoreHistory code has run. This is a good time to run SSTabRestoring. + "SessionStore:restoreHistoryComplete", + + // The load for the restoring tab has begun. We update the URL bar at this + // time; if we did it before, the load would overwrite it. + "SessionStore:restoreTabContentStarted", + + // All network loads for a restoring tab are done, so we should + // consider restoring another tab in the queue. The document has + // been restored, and forms have been filled. We trigger + // SSTabRestored at this time. + "SessionStore:restoreTabContentComplete", + + // A crashed tab was revived by navigating to a different page. Remove its + // browser from the list of crashed browsers to stop ignoring its messages. + "SessionStore:crashedTabRevived", + + // The content script encountered an error. + "SessionStore:error", +]; + +// The list of messages we accept from <xul:browser>s that have no tab +// assigned, or whose windows have gone away. Those are for example the +// ones that preload about:newtab pages, or from browsers where the window +// has just been closed. +const NOTAB_MESSAGES = new Set([ + // For a description see above. + "SessionStore:crashedTabRevived", + + // For a description see above. + "SessionStore:update", + + // For a description see above. + "SessionStore:error", +]); + +// The list of messages we accept without an "epoch" parameter. +// See getCurrentEpoch() and friends to find out what an "epoch" is. +const NOEPOCH_MESSAGES = new Set([ + // For a description see above. + "SessionStore:crashedTabRevived", + + // For a description see above. + "SessionStore:error", +]); + +// The list of messages we want to receive even during the short period after a +// frame has been removed from the DOM and before its frame script has finished +// unloading. +const CLOSED_MESSAGES = new Set([ + // For a description see above. + "SessionStore:crashedTabRevived", + + // For a description see above. + "SessionStore:update", + + // For a description see above. + "SessionStore:error", +]); + +// These are tab events that we listen to. +const TAB_EVENTS = [ + "TabOpen", "TabBrowserInserted", "TabClose", "TabSelect", "TabShow", "TabHide", "TabPinned", + "TabUnpinned" +]; + +const NS_XUL = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"; + +Cu.import("resource://gre/modules/PrivateBrowsingUtils.jsm", this); +Cu.import("resource://gre/modules/Promise.jsm", this); +Cu.import("resource://gre/modules/Services.jsm", this); +Cu.import("resource://gre/modules/Task.jsm", this); +Cu.import("resource://gre/modules/TelemetryStopwatch.jsm", this); +Cu.import("resource://gre/modules/TelemetryTimestamps.jsm", this); +Cu.import("resource://gre/modules/Timer.jsm", this); +Cu.import("resource://gre/modules/XPCOMUtils.jsm", this); +Cu.import("resource://gre/modules/debug.js", this); +Cu.import("resource://gre/modules/osfile.jsm", this); + +XPCOMUtils.defineLazyServiceGetter(this, "gSessionStartup", + "@mozilla.org/browser/sessionstartup;1", "nsISessionStartup"); +XPCOMUtils.defineLazyServiceGetter(this, "gScreenManager", + "@mozilla.org/gfx/screenmanager;1", "nsIScreenManager"); +XPCOMUtils.defineLazyServiceGetter(this, "Telemetry", + "@mozilla.org/base/telemetry;1", "nsITelemetry"); +XPCOMUtils.defineLazyModuleGetter(this, "console", + "resource://gre/modules/Console.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow", + "resource:///modules/RecentWindow.jsm"); + +XPCOMUtils.defineLazyModuleGetter(this, "AppConstants", + "resource://gre/modules/AppConstants.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "GlobalState", + "resource:///modules/sessionstore/GlobalState.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "PrivacyFilter", + "resource:///modules/sessionstore/PrivacyFilter.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "RunState", + "resource:///modules/sessionstore/RunState.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "ScratchpadManager", + "resource://devtools/client/scratchpad/scratchpad-manager.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "SessionSaver", + "resource:///modules/sessionstore/SessionSaver.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "SessionCookies", + "resource:///modules/sessionstore/SessionCookies.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "SessionFile", + "resource:///modules/sessionstore/SessionFile.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "TabAttributes", + "resource:///modules/sessionstore/TabAttributes.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "TabCrashHandler", + "resource:///modules/ContentCrashHandlers.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "TabState", + "resource:///modules/sessionstore/TabState.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "TabStateCache", + "resource:///modules/sessionstore/TabStateCache.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "TabStateFlusher", + "resource:///modules/sessionstore/TabStateFlusher.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "Utils", + "resource://gre/modules/sessionstore/Utils.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "ViewSourceBrowser", + "resource://gre/modules/ViewSourceBrowser.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "AsyncShutdown", + "resource://gre/modules/AsyncShutdown.jsm"); + +/** + * |true| if we are in debug mode, |false| otherwise. + * Debug mode is controlled by preference browser.sessionstore.debug + */ +var gDebuggingEnabled = false; +function debug(aMsg) { + if (gDebuggingEnabled) { + aMsg = ("SessionStore: " + aMsg).replace(/\S{80}/g, "$&\n"); + Services.console.logStringMessage(aMsg); + } +} + +this.SessionStore = { + get promiseInitialized() { + return SessionStoreInternal.promiseInitialized; + }, + + get canRestoreLastSession() { + return SessionStoreInternal.canRestoreLastSession; + }, + + set canRestoreLastSession(val) { + SessionStoreInternal.canRestoreLastSession = val; + }, + + get lastClosedObjectType() { + return SessionStoreInternal.lastClosedObjectType; + }, + + init: function ss_init() { + SessionStoreInternal.init(); + }, + + getBrowserState: function ss_getBrowserState() { + return SessionStoreInternal.getBrowserState(); + }, + + setBrowserState: function ss_setBrowserState(aState) { + SessionStoreInternal.setBrowserState(aState); + }, + + getWindowState: function ss_getWindowState(aWindow) { + return SessionStoreInternal.getWindowState(aWindow); + }, + + setWindowState: function ss_setWindowState(aWindow, aState, aOverwrite) { + SessionStoreInternal.setWindowState(aWindow, aState, aOverwrite); + }, + + getTabState: function ss_getTabState(aTab) { + return SessionStoreInternal.getTabState(aTab); + }, + + setTabState: function ss_setTabState(aTab, aState) { + SessionStoreInternal.setTabState(aTab, aState); + }, + + duplicateTab: function ss_duplicateTab(aWindow, aTab, aDelta = 0) { + return SessionStoreInternal.duplicateTab(aWindow, aTab, aDelta); + }, + + getClosedTabCount: function ss_getClosedTabCount(aWindow) { + return SessionStoreInternal.getClosedTabCount(aWindow); + }, + + getClosedTabData: function ss_getClosedTabData(aWindow, aAsString = true) { + return SessionStoreInternal.getClosedTabData(aWindow, aAsString); + }, + + undoCloseTab: function ss_undoCloseTab(aWindow, aIndex) { + return SessionStoreInternal.undoCloseTab(aWindow, aIndex); + }, + + forgetClosedTab: function ss_forgetClosedTab(aWindow, aIndex) { + return SessionStoreInternal.forgetClosedTab(aWindow, aIndex); + }, + + getClosedWindowCount: function ss_getClosedWindowCount() { + return SessionStoreInternal.getClosedWindowCount(); + }, + + getClosedWindowData: function ss_getClosedWindowData(aAsString = true) { + return SessionStoreInternal.getClosedWindowData(aAsString); + }, + + undoCloseWindow: function ss_undoCloseWindow(aIndex) { + return SessionStoreInternal.undoCloseWindow(aIndex); + }, + + forgetClosedWindow: function ss_forgetClosedWindow(aIndex) { + return SessionStoreInternal.forgetClosedWindow(aIndex); + }, + + getWindowValue: function ss_getWindowValue(aWindow, aKey) { + return SessionStoreInternal.getWindowValue(aWindow, aKey); + }, + + setWindowValue: function ss_setWindowValue(aWindow, aKey, aStringValue) { + SessionStoreInternal.setWindowValue(aWindow, aKey, aStringValue); + }, + + deleteWindowValue: function ss_deleteWindowValue(aWindow, aKey) { + SessionStoreInternal.deleteWindowValue(aWindow, aKey); + }, + + getTabValue: function ss_getTabValue(aTab, aKey) { + return SessionStoreInternal.getTabValue(aTab, aKey); + }, + + setTabValue: function ss_setTabValue(aTab, aKey, aStringValue) { + SessionStoreInternal.setTabValue(aTab, aKey, aStringValue); + }, + + deleteTabValue: function ss_deleteTabValue(aTab, aKey) { + SessionStoreInternal.deleteTabValue(aTab, aKey); + }, + + getGlobalValue: function ss_getGlobalValue(aKey) { + return SessionStoreInternal.getGlobalValue(aKey); + }, + + setGlobalValue: function ss_setGlobalValue(aKey, aStringValue) { + SessionStoreInternal.setGlobalValue(aKey, aStringValue); + }, + + deleteGlobalValue: function ss_deleteGlobalValue(aKey) { + SessionStoreInternal.deleteGlobalValue(aKey); + }, + + persistTabAttribute: function ss_persistTabAttribute(aName) { + SessionStoreInternal.persistTabAttribute(aName); + }, + + restoreLastSession: function ss_restoreLastSession() { + SessionStoreInternal.restoreLastSession(); + }, + + getCurrentState: function (aUpdateAll) { + return SessionStoreInternal.getCurrentState(aUpdateAll); + }, + + reviveCrashedTab(aTab) { + return SessionStoreInternal.reviveCrashedTab(aTab); + }, + + reviveAllCrashedTabs() { + return SessionStoreInternal.reviveAllCrashedTabs(); + }, + + navigateAndRestore(tab, loadArguments, historyIndex) { + return SessionStoreInternal.navigateAndRestore(tab, loadArguments, historyIndex); + }, + + getSessionHistory(tab, updatedCallback) { + return SessionStoreInternal.getSessionHistory(tab, updatedCallback); + }, + + undoCloseById(aClosedId) { + return SessionStoreInternal.undoCloseById(aClosedId); + }, + + /** + * Determines whether the passed version number is compatible with + * the current version number of the SessionStore. + * + * @param version The format and version of the file, as an array, e.g. + * ["sessionrestore", 1] + */ + isFormatVersionCompatible(version) { + if (!version) { + return false; + } + if (!Array.isArray(version)) { + // Improper format. + return false; + } + if (version[0] != "sessionrestore") { + // Not a Session Restore file. + return false; + } + let number = Number.parseFloat(version[1]); + if (Number.isNaN(number)) { + return false; + } + return number <= FORMAT_VERSION; + }, +}; + +// Freeze the SessionStore object. We don't want anyone to modify it. +Object.freeze(SessionStore); + +var SessionStoreInternal = { + QueryInterface: XPCOMUtils.generateQI([ + Ci.nsIDOMEventListener, + Ci.nsIObserver, + Ci.nsISupportsWeakReference + ]), + + _globalState: new GlobalState(), + + // A counter to be used to generate a unique ID for each closed tab or window. + _nextClosedId: 0, + + // During the initial restore and setBrowserState calls tracks the number of + // windows yet to be restored + _restoreCount: -1, + + // For each <browser> element, records the current epoch. + _browserEpochs: new WeakMap(), + + // Any browsers that fires the oop-browser-crashed event gets stored in + // here - that way we know which browsers to ignore messages from (until + // they get restored). + _crashedBrowsers: new WeakSet(), + + // A map (xul:browser -> nsIFrameLoader) that maps a browser to the last + // associated frameLoader we heard about. + _lastKnownFrameLoader: new WeakMap(), + + // A map (xul:browser -> object) that maps a browser associated with a + // recently closed tab to all its necessary state information we need to + // properly handle final update message. + _closedTabs: new WeakMap(), + + // A map (xul:browser -> object) that maps a browser associated with a + // recently closed tab due to a window closure to the tab state information + // that is being stored in _closedWindows for that tab. + _closedWindowTabs: new WeakMap(), + + // A set of window data that has the potential to be saved in the _closedWindows + // array for the session. We will remove window data from this set whenever + // forgetClosedWindow is called for the window, or when session history is + // purged, so that we don't accidentally save that data after the flush has + // completed. Closed tabs use a more complicated mechanism for this particular + // problem. When forgetClosedTab is called, the browser is removed from the + // _closedTabs map, so its data is not recorded. In the purge history case, + // the closedTabs array per window is overwritten so that once the flush is + // complete, the tab would only ever add itself to an array that SessionStore + // no longer cares about. Bug 1230636 has been filed to make the tab case + // work more like the window case, which is more explicit, and easier to + // reason about. + _saveableClosedWindowData: new WeakSet(), + + // A map (xul:browser -> object) that maps a browser that is switching + // remoteness via navigateAndRestore, to the loadArguments that were + // most recently passed when calling navigateAndRestore. + _remotenessChangingBrowsers: new WeakMap(), + + // whether a setBrowserState call is in progress + _browserSetState: false, + + // time in milliseconds when the session was started (saved across sessions), + // defaults to now if no session was restored or timestamp doesn't exist + _sessionStartTime: Date.now(), + + // states for all currently opened windows + _windows: {}, + + // counter for creating unique window IDs + _nextWindowID: 0, + + // states for all recently closed windows + _closedWindows: [], + + // collection of session states yet to be restored + _statesToRestore: {}, + + // counts the number of crashes since the last clean start + _recentCrashes: 0, + + // whether the last window was closed and should be restored + _restoreLastWindow: false, + + // number of tabs currently restoring + _tabsRestoringCount: 0, + + // When starting Firefox with a single private window, this is the place + // where we keep the session we actually wanted to restore in case the user + // decides to later open a non-private window as well. + _deferredInitialState: null, + + // A promise resolved once initialization is complete + _deferredInitialized: (function () { + let deferred = {}; + + deferred.promise = new Promise((resolve, reject) => { + deferred.resolve = resolve; + deferred.reject = reject; + }); + + return deferred; + })(), + + // Whether session has been initialized + _sessionInitialized: false, + + // Promise that is resolved when we're ready to initialize + // and restore the session. + _promiseReadyForInitialization: null, + + // Keep busy state counters per window. + _windowBusyStates: new WeakMap(), + + /** + * A promise fulfilled once initialization is complete. + */ + get promiseInitialized() { + return this._deferredInitialized.promise; + }, + + get canRestoreLastSession() { + return LastSession.canRestore; + }, + + set canRestoreLastSession(val) { + // Cheat a bit; only allow false. + if (!val) { + LastSession.clear(); + } + }, + + /** + * Returns a string describing the last closed object, either "tab" or "window". + * + * This was added to support the sessions.restore WebExtensions API. + */ + get lastClosedObjectType() { + if (this._closedWindows.length) { + // Since there are closed windows, we need to check if there's a closed tab + // in one of the currently open windows that was closed after the + // last-closed window. + let tabTimestamps = []; + let windowsEnum = Services.wm.getEnumerator("navigator:browser"); + while (windowsEnum.hasMoreElements()) { + let window = windowsEnum.getNext(); + let windowState = this._windows[window.__SSi]; + if (windowState && windowState._closedTabs[0]) { + tabTimestamps.push(windowState._closedTabs[0].closedAt); + } + } + if (!tabTimestamps.length || + (tabTimestamps.sort((a, b) => b - a)[0] < this._closedWindows[0].closedAt)) { + return "window"; + } + } + return "tab"; + }, + + /** + * Initialize the sessionstore service. + */ + init: function () { + if (this._initialized) { + throw new Error("SessionStore.init() must only be called once!"); + } + + TelemetryTimestamps.add("sessionRestoreInitialized"); + OBSERVING.forEach(function(aTopic) { + Services.obs.addObserver(this, aTopic, true); + }, this); + + this._initPrefs(); + this._initialized = true; + }, + + /** + * Initialize the session using the state provided by SessionStartup + */ + initSession: function () { + TelemetryStopwatch.start("FX_SESSION_RESTORE_STARTUP_INIT_SESSION_MS"); + let state; + let ss = gSessionStartup; + + if (ss.doRestore() || + ss.sessionType == Ci.nsISessionStartup.DEFER_SESSION) { + state = ss.state; + } + + if (state) { + try { + // If we're doing a DEFERRED session, then we want to pull pinned tabs + // out so they can be restored. + if (ss.sessionType == Ci.nsISessionStartup.DEFER_SESSION) { + let [iniState, remainingState] = this._prepDataForDeferredRestore(state); + // If we have a iniState with windows, that means that we have windows + // with app tabs to restore. + if (iniState.windows.length) + state = iniState; + else + state = null; + + if (remainingState.windows.length) { + LastSession.setState(remainingState); + } + } + else { + // Get the last deferred session in case the user still wants to + // restore it + LastSession.setState(state.lastSessionState); + + if (ss.previousSessionCrashed) { + this._recentCrashes = (state.session && + state.session.recentCrashes || 0) + 1; + + if (this._needsRestorePage(state, this._recentCrashes)) { + // replace the crashed session with a restore-page-only session + let url = "about:sessionrestore"; + let formdata = {id: {sessionData: state}, url}; + state = { windows: [{ tabs: [{ entries: [{url}], formdata }] }] }; + } else if (this._hasSingleTabWithURL(state.windows, + "about:welcomeback")) { + // On a single about:welcomeback URL that crashed, replace about:welcomeback + // with about:sessionrestore, to make clear to the user that we crashed. + state.windows[0].tabs[0].entries[0].url = "about:sessionrestore"; + } + } + + // Update the session start time using the restored session state. + this._updateSessionStartTime(state); + + // make sure that at least the first window doesn't have anything hidden + delete state.windows[0].hidden; + // Since nothing is hidden in the first window, it cannot be a popup + delete state.windows[0].isPopup; + // We don't want to minimize and then open a window at startup. + if (state.windows[0].sizemode == "minimized") + state.windows[0].sizemode = "normal"; + // clear any lastSessionWindowID attributes since those don't matter + // during normal restore + state.windows.forEach(function(aWindow) { + delete aWindow.__lastSessionWindowID; + }); + } + } + catch (ex) { debug("The session file is invalid: " + ex); } + } + + // at this point, we've as good as resumed the session, so we can + // clear the resume_session_once flag, if it's set + if (!RunState.isQuitting && + this._prefBranch.getBoolPref("sessionstore.resume_session_once")) + this._prefBranch.setBoolPref("sessionstore.resume_session_once", false); + + TelemetryStopwatch.finish("FX_SESSION_RESTORE_STARTUP_INIT_SESSION_MS"); + return state; + }, + + _initPrefs : function() { + this._prefBranch = Services.prefs.getBranch("browser."); + + gDebuggingEnabled = this._prefBranch.getBoolPref("sessionstore.debug"); + + Services.prefs.addObserver("browser.sessionstore.debug", () => { + gDebuggingEnabled = this._prefBranch.getBoolPref("sessionstore.debug"); + }, false); + + this._max_tabs_undo = this._prefBranch.getIntPref("sessionstore.max_tabs_undo"); + this._prefBranch.addObserver("sessionstore.max_tabs_undo", this, true); + + this._max_windows_undo = this._prefBranch.getIntPref("sessionstore.max_windows_undo"); + this._prefBranch.addObserver("sessionstore.max_windows_undo", this, true); + }, + + /** + * Called on application shutdown, after notifications: + * quit-application-granted, quit-application + */ + _uninit: function ssi_uninit() { + if (!this._initialized) { + throw new Error("SessionStore is not initialized."); + } + + // Prepare to close the session file and write the last state. + RunState.setClosing(); + + // save all data for session resuming + if (this._sessionInitialized) { + SessionSaver.run(); + } + + // clear out priority queue in case it's still holding refs + TabRestoreQueue.reset(); + + // Make sure to cancel pending saves. + SessionSaver.cancel(); + }, + + /** + * Handle notifications + */ + observe: function ssi_observe(aSubject, aTopic, aData) { + switch (aTopic) { + case "browser-window-before-show": // catch new windows + this.onBeforeBrowserWindowShown(aSubject); + break; + case "domwindowclosed": // catch closed windows + this.onClose(aSubject); + break; + case "quit-application-granted": + let syncShutdown = aData == "syncShutdown"; + this.onQuitApplicationGranted(syncShutdown); + break; + case "browser-lastwindow-close-granted": + this.onLastWindowCloseGranted(); + break; + case "quit-application": + this.onQuitApplication(aData); + break; + case "browser:purge-session-history": // catch sanitization + this.onPurgeSessionHistory(); + break; + case "browser:purge-domain-data": + this.onPurgeDomainData(aData); + break; + case "nsPref:changed": // catch pref changes + this.onPrefChange(aData); + break; + case "idle-daily": + this.onIdleDaily(); + break; + } + }, + + /** + * This method handles incoming messages sent by the session store content + * script via the Frame Message Manager or Parent Process Message Manager, + * and thus enables communication with OOP tabs. + */ + receiveMessage(aMessage) { + // If we got here, that means we're dealing with a frame message + // manager message, so the target will be a <xul:browser>. + var browser = aMessage.target; + let win = browser.ownerGlobal; + let tab = win ? win.gBrowser.getTabForBrowser(browser) : null; + + // Ensure we receive only specific messages from <xul:browser>s that + // have no tab or window assigned, e.g. the ones that preload + // about:newtab pages, or windows that have closed. + if (!tab && !NOTAB_MESSAGES.has(aMessage.name)) { + throw new Error(`received unexpected message '${aMessage.name}' ` + + `from a browser that has no tab or window`); + } + + let data = aMessage.data || {}; + let hasEpoch = data.hasOwnProperty("epoch"); + + // Most messages sent by frame scripts require to pass an epoch. + if (!hasEpoch && !NOEPOCH_MESSAGES.has(aMessage.name)) { + throw new Error(`received message '${aMessage.name}' without an epoch`); + } + + // Ignore messages from previous epochs. + if (hasEpoch && !this.isCurrentEpoch(browser, data.epoch)) { + return; + } + + switch (aMessage.name) { + case "SessionStore:update": + // |browser.frameLoader| might be empty if the browser was already + // destroyed and its tab removed. In that case we still have the last + // frameLoader we know about to compare. + let frameLoader = browser.frameLoader || + this._lastKnownFrameLoader.get(browser.permanentKey); + + // If the message isn't targeting the latest frameLoader discard it. + if (frameLoader != aMessage.targetFrameLoader) { + return; + } + + if (aMessage.data.isFinal) { + // If this the final message we need to resolve all pending flush + // requests for the given browser as they might have been sent too + // late and will never respond. If they have been sent shortly after + // switching a browser's remoteness there isn't too much data to skip. + TabStateFlusher.resolveAll(browser); + } else if (aMessage.data.flushID) { + // This is an update kicked off by an async flush request. Notify the + // TabStateFlusher so that it can finish the request and notify its + // consumer that's waiting for the flush to be done. + TabStateFlusher.resolve(browser, aMessage.data.flushID); + } + + // Ignore messages from <browser> elements that have crashed + // and not yet been revived. + if (this._crashedBrowsers.has(browser.permanentKey)) { + return; + } + + // Record telemetry measurements done in the child and update the tab's + // cached state. Mark the window as dirty and trigger a delayed write. + this.recordTelemetry(aMessage.data.telemetry); + TabState.update(browser, aMessage.data); + this.saveStateDelayed(win); + + // Handle any updates sent by the child after the tab was closed. This + // might be the final update as sent by the "unload" handler but also + // any async update message that was sent before the child unloaded. + if (this._closedTabs.has(browser.permanentKey)) { + let {closedTabs, tabData} = this._closedTabs.get(browser.permanentKey); + + // Update the closed tab's state. This will be reflected in its + // window's list of closed tabs as that refers to the same object. + TabState.copyFromCache(browser, tabData.state); + + // Is this the tab's final message? + if (aMessage.data.isFinal) { + // We expect no further updates. + this._closedTabs.delete(browser.permanentKey); + // The tab state no longer needs this reference. + delete tabData.permanentKey; + + // Determine whether the tab state is worth saving. + let shouldSave = this._shouldSaveTabState(tabData.state); + let index = closedTabs.indexOf(tabData); + + if (shouldSave && index == -1) { + // If the tab state is worth saving and we didn't push it onto + // the list of closed tabs when it was closed (because we deemed + // the state not worth saving) then add it to the window's list + // of closed tabs now. + this.saveClosedTabData(closedTabs, tabData); + } else if (!shouldSave && index > -1) { + // Remove from the list of closed tabs. The update messages sent + // after the tab was closed changed enough state so that we no + // longer consider its data interesting enough to keep around. + this.removeClosedTabData(closedTabs, index); + } + } + } + break; + case "SessionStore:restoreHistoryComplete": + // Notify the tabbrowser that the tab chrome has been restored. + let tabData = TabState.collect(tab); + + // wall-paper fix for bug 439675: make sure that the URL to be loaded + // is always visible in the address bar if no other value is present + let activePageData = tabData.entries[tabData.index - 1] || null; + let uri = activePageData ? activePageData.url || null : null; + // NB: we won't set initial URIs (about:home, about:newtab, etc.) here + // because their load will not normally trigger a location bar clearing + // when they finish loading (to avoid race conditions where we then + // clear user input instead), so we shouldn't set them here either. + // They also don't fall under the issues in bug 439675 where user input + // needs to be preserved if the load doesn't succeed. + // We also don't do this for remoteness updates, where it should not + // be necessary. + if (!browser.userTypedValue && uri && !data.isRemotenessUpdate && + !win.gInitialPages.includes(uri)) { + browser.userTypedValue = uri; + } + + // If the page has a title, set it. + if (activePageData) { + if (activePageData.title) { + tab.label = activePageData.title; + tab.crop = "end"; + } else if (activePageData.url != "about:blank") { + tab.label = activePageData.url; + tab.crop = "center"; + } + } else if (tab.hasAttribute("customizemode")) { + win.gCustomizeMode.setTab(tab); + } + + // Restore the tab icon. + if ("image" in tabData) { + // Use the serialized contentPrincipal with the new icon load. + let loadingPrincipal = Utils.deserializePrincipal(tabData.iconLoadingPrincipal); + win.gBrowser.setIcon(tab, tabData.image, loadingPrincipal); + TabStateCache.update(browser, { image: null, iconLoadingPrincipal: null }); + } + + let event = win.document.createEvent("Events"); + event.initEvent("SSTabRestoring", true, false); + tab.dispatchEvent(event); + break; + case "SessionStore:restoreTabContentStarted": + if (browser.__SS_restoreState == TAB_STATE_NEEDS_RESTORE) { + // If a load not initiated by sessionstore was started in a + // previously pending tab. Mark the tab as no longer pending. + this.markTabAsRestoring(tab); + } else if (!data.isRemotenessUpdate) { + // If the user was typing into the URL bar when we crashed, but hadn't hit + // enter yet, then we just need to write that value to the URL bar without + // loading anything. This must happen after the load, as the load will clear + // userTypedValue. + let tabData = TabState.collect(tab); + if (tabData.userTypedValue && !tabData.userTypedClear && !browser.userTypedValue) { + browser.userTypedValue = tabData.userTypedValue; + win.URLBarSetURI(); + } + + // Remove state we don't need any longer. + TabStateCache.update(browser, { + userTypedValue: null, userTypedClear: null + }); + } + break; + case "SessionStore:restoreTabContentComplete": + // This callback is used exclusively by tests that want to + // monitor the progress of network loads. + if (gDebuggingEnabled) { + Services.obs.notifyObservers(browser, NOTIFY_TAB_RESTORED, null); + } + + SessionStoreInternal._resetLocalTabRestoringState(tab); + SessionStoreInternal.restoreNextTab(); + + this._sendTabRestoredNotification(tab, data.isRemotenessUpdate); + break; + case "SessionStore:crashedTabRevived": + // The browser was revived by navigating to a different page + // manually, so we remove it from the ignored browser set. + this._crashedBrowsers.delete(browser.permanentKey); + break; + case "SessionStore:error": + this.reportInternalError(data); + TabStateFlusher.resolveAll(browser, false, "Received error from the content process"); + break; + default: + throw new Error(`received unknown message '${aMessage.name}'`); + break; + } + }, + + /** + * Record telemetry measurements stored in an object. + * @param telemetry + * {histogramID: value, ...} An object mapping histogramIDs to the + * value to be recorded for that ID, + */ + recordTelemetry: function (telemetry) { + for (let histogramId in telemetry){ + Telemetry.getHistogramById(histogramId).add(telemetry[histogramId]); + } + }, + + /* ........ Window Event Handlers .............. */ + + /** + * Implement nsIDOMEventListener for handling various window and tab events + */ + handleEvent: function ssi_handleEvent(aEvent) { + let win = aEvent.currentTarget.ownerGlobal; + let target = aEvent.originalTarget; + switch (aEvent.type) { + case "TabOpen": + this.onTabAdd(win); + break; + case "TabBrowserInserted": + this.onTabBrowserInserted(win, target); + break; + case "TabClose": + // `adoptedBy` will be set if the tab was closed because it is being + // moved to a new window. + if (!aEvent.detail.adoptedBy) + this.onTabClose(win, target); + this.onTabRemove(win, target); + break; + case "TabSelect": + this.onTabSelect(win); + break; + case "TabShow": + this.onTabShow(win, target); + break; + case "TabHide": + this.onTabHide(win, target); + break; + case "TabPinned": + case "TabUnpinned": + case "SwapDocShells": + this.saveStateDelayed(win); + break; + case "oop-browser-crashed": + this.onBrowserCrashed(target); + break; + case "XULFrameLoaderCreated": + if (target.namespaceURI == NS_XUL && + target.localName == "browser" && + target.frameLoader && + target.permanentKey) { + this._lastKnownFrameLoader.set(target.permanentKey, target.frameLoader); + this.resetEpoch(target); + } + break; + default: + throw new Error(`unhandled event ${aEvent.type}?`); + } + this._clearRestoringWindows(); + }, + + /** + * Generate a unique window identifier + * @return string + * A unique string to identify a window + */ + _generateWindowID: function ssi_generateWindowID() { + return "window" + (this._nextWindowID++); + }, + + /** + * Registers and tracks a given window. + * + * @param aWindow + * Window reference + */ + onLoad(aWindow) { + // return if window has already been initialized + if (aWindow && aWindow.__SSi && this._windows[aWindow.__SSi]) + return; + + // ignore windows opened while shutting down + if (RunState.isQuitting) + return; + + // Assign the window a unique identifier we can use to reference + // internal data about the window. + aWindow.__SSi = this._generateWindowID(); + + let mm = aWindow.getGroupMessageManager("browsers"); + MESSAGES.forEach(msg => { + let listenWhenClosed = CLOSED_MESSAGES.has(msg); + mm.addMessageListener(msg, this, listenWhenClosed); + }); + + // Load the frame script after registering listeners. + mm.loadFrameScript("chrome://browser/content/content-sessionStore.js", true); + + // and create its data object + this._windows[aWindow.__SSi] = { tabs: [], selected: 0, _closedTabs: [], busy: false }; + + if (PrivateBrowsingUtils.isWindowPrivate(aWindow)) + this._windows[aWindow.__SSi].isPrivate = true; + if (!this._isWindowLoaded(aWindow)) + this._windows[aWindow.__SSi]._restoring = true; + if (!aWindow.toolbar.visible) + this._windows[aWindow.__SSi].isPopup = true; + + let tabbrowser = aWindow.gBrowser; + + // add tab change listeners to all already existing tabs + for (let i = 0; i < tabbrowser.tabs.length; i++) { + this.onTabBrowserInserted(aWindow, tabbrowser.tabs[i]); + } + // notification of tab add/remove/selection/show/hide + TAB_EVENTS.forEach(function(aEvent) { + tabbrowser.tabContainer.addEventListener(aEvent, this, true); + }, this); + + // Keep track of a browser's latest frameLoader. + aWindow.gBrowser.addEventListener("XULFrameLoaderCreated", this); + }, + + /** + * Initializes a given window. + * + * Windows are registered as soon as they are created but we need to wait for + * the session file to load, and the initial window's delayed startup to + * finish before initializing a window, i.e. restoring data into it. + * + * @param aWindow + * Window reference + * @param aInitialState + * The initial state to be loaded after startup (optional) + */ + initializeWindow(aWindow, aInitialState = null) { + let isPrivateWindow = PrivateBrowsingUtils.isWindowPrivate(aWindow); + + // perform additional initialization when the first window is loading + if (RunState.isStopped) { + RunState.setRunning(); + + // restore a crashed session resp. resume the last session if requested + if (aInitialState) { + // Don't write to disk right after startup. Set the last time we wrote + // to disk to NOW() to enforce a full interval before the next write. + SessionSaver.updateLastSaveTime(); + + if (isPrivateWindow) { + // We're starting with a single private window. Save the state we + // actually wanted to restore so that we can do it later in case + // the user opens another, non-private window. + this._deferredInitialState = gSessionStartup.state; + + // Nothing to restore now, notify observers things are complete. + Services.obs.notifyObservers(null, NOTIFY_WINDOWS_RESTORED, ""); + } else { + TelemetryTimestamps.add("sessionRestoreRestoring"); + this._restoreCount = aInitialState.windows ? aInitialState.windows.length : 0; + + // global data must be restored before restoreWindow is called so that + // it happens before observers are notified + this._globalState.setFromState(aInitialState); + + let overwrite = this._isCmdLineEmpty(aWindow, aInitialState); + let options = {firstWindow: true, overwriteTabs: overwrite}; + this.restoreWindows(aWindow, aInitialState, options); + } + } + else { + // Nothing to restore, notify observers things are complete. + Services.obs.notifyObservers(null, NOTIFY_WINDOWS_RESTORED, ""); + } + } + // this window was opened by _openWindowWithState + else if (!this._isWindowLoaded(aWindow)) { + let state = this._statesToRestore[aWindow.__SS_restoreID]; + let options = {overwriteTabs: true, isFollowUp: state.windows.length == 1}; + this.restoreWindow(aWindow, state.windows[0], options); + } + // The user opened another, non-private window after starting up with + // a single private one. Let's restore the session we actually wanted to + // restore at startup. + else if (this._deferredInitialState && !isPrivateWindow && + aWindow.toolbar.visible) { + + // global data must be restored before restoreWindow is called so that + // it happens before observers are notified + this._globalState.setFromState(this._deferredInitialState); + + this._restoreCount = this._deferredInitialState.windows ? + this._deferredInitialState.windows.length : 0; + this.restoreWindows(aWindow, this._deferredInitialState, {firstWindow: true}); + this._deferredInitialState = null; + } + else if (this._restoreLastWindow && aWindow.toolbar.visible && + this._closedWindows.length && !isPrivateWindow) { + + // default to the most-recently closed window + // don't use popup windows + let closedWindowState = null; + let closedWindowIndex; + for (let i = 0; i < this._closedWindows.length; i++) { + // Take the first non-popup, point our object at it, and break out. + if (!this._closedWindows[i].isPopup) { + closedWindowState = this._closedWindows[i]; + closedWindowIndex = i; + break; + } + } + + if (closedWindowState) { + let newWindowState; + if (AppConstants.platform == "macosx" || !this._doResumeSession()) { + // We want to split the window up into pinned tabs and unpinned tabs. + // Pinned tabs should be restored. If there are any remaining tabs, + // they should be added back to _closedWindows. + // We'll cheat a little bit and reuse _prepDataForDeferredRestore + // even though it wasn't built exactly for this. + let [appTabsState, normalTabsState] = + this._prepDataForDeferredRestore({ windows: [closedWindowState] }); + + // These are our pinned tabs, which we should restore + if (appTabsState.windows.length) { + newWindowState = appTabsState.windows[0]; + delete newWindowState.__lastSessionWindowID; + } + + // In case there were no unpinned tabs, remove the window from _closedWindows + if (!normalTabsState.windows.length) { + this._closedWindows.splice(closedWindowIndex, 1); + } + // Or update _closedWindows with the modified state + else { + delete normalTabsState.windows[0].__lastSessionWindowID; + this._closedWindows[closedWindowIndex] = normalTabsState.windows[0]; + } + } + else { + // If we're just restoring the window, make sure it gets removed from + // _closedWindows. + this._closedWindows.splice(closedWindowIndex, 1); + newWindowState = closedWindowState; + delete newWindowState.hidden; + } + + if (newWindowState) { + // Ensure that the window state isn't hidden + this._restoreCount = 1; + let state = { windows: [newWindowState] }; + let options = {overwriteTabs: this._isCmdLineEmpty(aWindow, state)}; + this.restoreWindow(aWindow, newWindowState, options); + } + } + // we actually restored the session just now. + this._prefBranch.setBoolPref("sessionstore.resume_session_once", false); + } + if (this._restoreLastWindow && aWindow.toolbar.visible) { + // always reset (if not a popup window) + // we don't want to restore a window directly after, for example, + // undoCloseWindow was executed. + this._restoreLastWindow = false; + } + }, + + /** + * Called right before a new browser window is shown. + * @param aWindow + * Window reference + */ + onBeforeBrowserWindowShown: function (aWindow) { + // Register the window. + this.onLoad(aWindow); + + // Just call initializeWindow() directly if we're initialized already. + if (this._sessionInitialized) { + this.initializeWindow(aWindow); + return; + } + + // The very first window that is opened creates a promise that is then + // re-used by all subsequent windows. The promise will be used to tell + // when we're ready for initialization. + if (!this._promiseReadyForInitialization) { + // Wait for the given window's delayed startup to be finished. + let promise = new Promise(resolve => { + Services.obs.addObserver(function obs(subject, topic) { + if (aWindow == subject) { + Services.obs.removeObserver(obs, topic); + resolve(); + } + }, "browser-delayed-startup-finished", false); + }); + + // We are ready for initialization as soon as the session file has been + // read from disk and the initial window's delayed startup has finished. + this._promiseReadyForInitialization = + Promise.all([promise, gSessionStartup.onceInitialized]); + } + + // We can't call this.onLoad since initialization + // hasn't completed, so we'll wait until it is done. + // Even if additional windows are opened and wait + // for initialization as well, the first opened + // window should execute first, and this.onLoad + // will be called with the initialState. + this._promiseReadyForInitialization.then(() => { + if (aWindow.closed) { + return; + } + + if (this._sessionInitialized) { + this.initializeWindow(aWindow); + } else { + let initialState = this.initSession(); + this._sessionInitialized = true; + + if (initialState) { + Services.obs.notifyObservers(null, NOTIFY_RESTORING_ON_STARTUP, ""); + } + TelemetryStopwatch.start("FX_SESSION_RESTORE_STARTUP_ONLOAD_INITIAL_WINDOW_MS"); + this.initializeWindow(aWindow, initialState); + TelemetryStopwatch.finish("FX_SESSION_RESTORE_STARTUP_ONLOAD_INITIAL_WINDOW_MS"); + + // Let everyone know we're done. + this._deferredInitialized.resolve(); + } + }, console.error); + }, + + /** + * On window close... + * - remove event listeners from tabs + * - save all window data + * @param aWindow + * Window reference + */ + onClose: function ssi_onClose(aWindow) { + // this window was about to be restored - conserve its original data, if any + let isFullyLoaded = this._isWindowLoaded(aWindow); + if (!isFullyLoaded) { + if (!aWindow.__SSi) { + aWindow.__SSi = this._generateWindowID(); + } + + this._windows[aWindow.__SSi] = this._statesToRestore[aWindow.__SS_restoreID]; + delete this._statesToRestore[aWindow.__SS_restoreID]; + delete aWindow.__SS_restoreID; + } + + // ignore windows not tracked by SessionStore + if (!aWindow.__SSi || !this._windows[aWindow.__SSi]) { + return; + } + + // notify that the session store will stop tracking this window so that + // extensions can store any data about this window in session store before + // that's not possible anymore + let event = aWindow.document.createEvent("Events"); + event.initEvent("SSWindowClosing", true, false); + aWindow.dispatchEvent(event); + + if (this.windowToFocus && this.windowToFocus == aWindow) { + delete this.windowToFocus; + } + + var tabbrowser = aWindow.gBrowser; + + let browsers = Array.from(tabbrowser.browsers); + + TAB_EVENTS.forEach(function(aEvent) { + tabbrowser.tabContainer.removeEventListener(aEvent, this, true); + }, this); + + aWindow.gBrowser.removeEventListener("XULFrameLoaderCreated", this); + + let winData = this._windows[aWindow.__SSi]; + + // Collect window data only when *not* closed during shutdown. + if (RunState.isRunning) { + // Grab the most recent window data. The tab data will be updated + // once we finish flushing all of the messages from the tabs. + let tabMap = this._collectWindowData(aWindow); + + for (let [tab, tabData] of tabMap) { + let permanentKey = tab.linkedBrowser.permanentKey; + this._closedWindowTabs.set(permanentKey, tabData); + } + + if (isFullyLoaded) { + winData.title = tabbrowser.selectedBrowser.contentTitle || tabbrowser.selectedTab.label; + winData.title = this._replaceLoadingTitle(winData.title, tabbrowser, + tabbrowser.selectedTab); + SessionCookies.update([winData]); + } + + if (AppConstants.platform != "macosx") { + // Until we decide otherwise elsewhere, this window is part of a series + // of closing windows to quit. + winData._shouldRestore = true; + } + + // Store the window's close date to figure out when each individual tab + // was closed. This timestamp should allow re-arranging data based on how + // recently something was closed. + winData.closedAt = Date.now(); + + // we don't want to save the busy state + delete winData.busy; + + // When closing windows one after the other until Firefox quits, we + // will move those closed in series back to the "open windows" bucket + // before writing to disk. If however there is only a single window + // with tabs we deem not worth saving then we might end up with a + // random closed or even a pop-up window re-opened. To prevent that + // we explicitly allow saving an "empty" window state. + let isLastWindow = + Object.keys(this._windows).length == 1 && + !this._closedWindows.some(win => win._shouldRestore || false); + + // clear this window from the list, since it has definitely been closed. + delete this._windows[aWindow.__SSi]; + + // This window has the potential to be saved in the _closedWindows + // array (maybeSaveClosedWindows gets the final call on that). + this._saveableClosedWindowData.add(winData); + + // Now we have to figure out if this window is worth saving in the _closedWindows + // Object. + // + // We're about to flush the tabs from this window, but it's possible that we + // might never hear back from the content process(es) in time before the user + // chooses to restore the closed window. So we do the following: + // + // 1) Use the tab state cache to determine synchronously if the window is + // worth stashing in _closedWindows. + // 2) Flush the window. + // 3) When the flush is complete, revisit our decision to store the window + // in _closedWindows, and add/remove as necessary. + if (!winData.isPrivate) { + // Remove any open private tabs the window may contain. + PrivacyFilter.filterPrivateTabs(winData); + this.maybeSaveClosedWindow(winData, isLastWindow); + } + + TabStateFlusher.flushWindow(aWindow).then(() => { + // At this point, aWindow is closed! You should probably not try to + // access any DOM elements from aWindow within this callback unless + // you're holding on to them in the closure. + + for (let browser of browsers) { + if (this._closedWindowTabs.has(browser.permanentKey)) { + let tabData = this._closedWindowTabs.get(browser.permanentKey); + TabState.copyFromCache(browser, tabData); + this._closedWindowTabs.delete(browser.permanentKey); + } + } + + // Save non-private windows if they have at + // least one saveable tab or are the last window. + if (!winData.isPrivate) { + // It's possible that a tab switched its privacy state at some point + // before our flush, so we need to filter again. + PrivacyFilter.filterPrivateTabs(winData); + this.maybeSaveClosedWindow(winData, isLastWindow); + } + + // Update the tabs data now that we've got the most + // recent information. + this.cleanUpWindow(aWindow, winData, browsers); + + // save the state without this window to disk + this.saveStateDelayed(); + }); + } else { + this.cleanUpWindow(aWindow, winData, browsers); + } + + for (let i = 0; i < tabbrowser.tabs.length; i++) { + this.onTabRemove(aWindow, tabbrowser.tabs[i], true); + } + }, + + /** + * Clean up the message listeners on a window that has finally + * gone away. Call this once you're sure you don't want to hear + * from any of this windows tabs from here forward. + * + * @param aWindow + * The browser window we're cleaning up. + * @param winData + * The data for the window that we should hold in the + * DyingWindowCache in case anybody is still holding a + * reference to it. + */ + cleanUpWindow(aWindow, winData, browsers) { + // Any leftover TabStateFlusher Promises need to be resolved now, + // since we're about to remove the message listeners. + for (let browser of browsers) { + TabStateFlusher.resolveAll(browser); + } + + // Cache the window state until it is completely gone. + DyingWindowCache.set(aWindow, winData); + + let mm = aWindow.getGroupMessageManager("browsers"); + MESSAGES.forEach(msg => mm.removeMessageListener(msg, this)); + + this._saveableClosedWindowData.delete(winData); + delete aWindow.__SSi; + }, + + /** + * Decides whether or not a closed window should be put into the + * _closedWindows Object. This might be called multiple times per + * window, and will do the right thing of moving the window data + * in or out of _closedWindows if the winData indicates that our + * need for saving it has changed. + * + * @param winData + * The data for the closed window that we might save. + * @param isLastWindow + * Whether or not the window being closed is the last + * browser window. Callers of this function should pass + * in the value of SessionStoreInternal.atLastWindow for + * this argument, and pass in the same value if they happen + * to call this method again asynchronously (for example, after + * a window flush). + */ + maybeSaveClosedWindow(winData, isLastWindow) { + // Make sure SessionStore is still running, and make sure that we + // haven't chosen to forget this window. + if (RunState.isRunning && this._saveableClosedWindowData.has(winData)) { + // Determine whether the window has any tabs worth saving. + let hasSaveableTabs = winData.tabs.some(this._shouldSaveTabState); + + // Note that we might already have this window stored in + // _closedWindows from a previous call to this function. + let winIndex = this._closedWindows.indexOf(winData); + let alreadyStored = (winIndex != -1); + let shouldStore = (hasSaveableTabs || isLastWindow); + + if (shouldStore && !alreadyStored) { + let index = this._closedWindows.findIndex(win => { + return win.closedAt < winData.closedAt; + }); + + // If we found no tab closed before our + // tab then just append it to the list. + if (index == -1) { + index = this._closedWindows.length; + } + + // About to save the closed window, add a unique ID. + winData.closedId = this._nextClosedId++; + + // Insert tabData at the right position. + this._closedWindows.splice(index, 0, winData); + this._capClosedWindows(); + } else if (!shouldStore && alreadyStored) { + this._closedWindows.splice(winIndex, 1); + } + } + }, + + /** + * On quit application granted + */ + onQuitApplicationGranted: function ssi_onQuitApplicationGranted(syncShutdown=false) { + // Collect an initial snapshot of window data before we do the flush + this._forEachBrowserWindow((win) => { + this._collectWindowData(win); + }); + + // Now add an AsyncShutdown blocker that'll spin the event loop + // until the windows have all been flushed. + + // This progress object will track the state of async window flushing + // and will help us debug things that go wrong with our AsyncShutdown + // blocker. + let progress = { total: -1, current: -1 }; + + // We're going down! Switch state so that we treat closing windows and + // tabs correctly. + RunState.setQuitting(); + + if (!syncShutdown) { + // We've got some time to shut down, so let's do this properly. + // To prevent blocker from breaking the 60 sec limit(which will cause a + // crash) of async shutdown during flushing all windows, we resolve the + // promise passed to blocker once: + // 1. the flushing exceed 50 sec, or + // 2. 'oop-frameloader-crashed' or 'ipc:content-shutdown' is observed. + // Thus, Firefox still can open the last session on next startup. + AsyncShutdown.quitApplicationGranted.addBlocker( + "SessionStore: flushing all windows", + () => { + var promises = []; + promises.push(this.flushAllWindowsAsync(progress)); + promises.push(this.looseTimer(50000)); + + var promiseOFC = new Promise(resolve => { + Services.obs.addObserver(function obs(subject, topic) { + Services.obs.removeObserver(obs, topic); + resolve(); + }, "oop-frameloader-crashed", false); + }); + promises.push(promiseOFC); + + var promiseICS = new Promise(resolve => { + Services.obs.addObserver(function obs(subject, topic) { + Services.obs.removeObserver(obs, topic); + resolve(); + }, "ipc:content-shutdown", false); + }); + promises.push(promiseICS); + + return Promise.race(promises); + }, + () => progress); + } else { + // We have to shut down NOW, which means we only get to save whatever + // we already had cached. + } + }, + + /** + * An async Task that iterates all open browser windows and flushes + * any outstanding messages from their tabs. This will also close + * all of the currently open windows while we wait for the flushes + * to complete. + * + * @param progress (Object) + * Optional progress object that will be updated as async + * window flushing progresses. flushAllWindowsSync will + * write to the following properties: + * + * total (int): + * The total number of windows to be flushed. + * current (int): + * The current window that we're waiting for a flush on. + * + * @return Promise + */ + flushAllWindowsAsync: Task.async(function*(progress={}) { + let windowPromises = new Map(); + // We collect flush promises and close each window immediately so that + // the user can't start changing any window state while we're waiting + // for the flushes to finish. + this._forEachBrowserWindow((win) => { + windowPromises.set(win, TabStateFlusher.flushWindow(win)); + + // We have to wait for these messages to come up from + // each window and each browser. In the meantime, hide + // the windows to improve perceived shutdown speed. + let baseWin = win.QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDocShell) + .QueryInterface(Ci.nsIDocShellTreeItem) + .treeOwner + .QueryInterface(Ci.nsIBaseWindow); + baseWin.visibility = false; + }); + + progress.total = windowPromises.size; + progress.current = 0; + + // We'll iterate through the Promise array, yielding each one, so as to + // provide useful progress information to AsyncShutdown. + for (let [win, promise] of windowPromises) { + yield promise; + this._collectWindowData(win); + progress.current++; + }; + + // We must cache this because _getMostRecentBrowserWindow will always + // return null by the time quit-application occurs. + var activeWindow = this._getMostRecentBrowserWindow(); + if (activeWindow) + this.activeWindowSSiCache = activeWindow.__SSi || ""; + DirtyWindows.clear(); + }), + + /** + * On last browser window close + */ + onLastWindowCloseGranted: function ssi_onLastWindowCloseGranted() { + // last browser window is quitting. + // remember to restore the last window when another browser window is opened + // do not account for pref(resume_session_once) at this point, as it might be + // set by another observer getting this notice after us + this._restoreLastWindow = true; + }, + + /** + * On quitting application + * @param aData + * String type of quitting + */ + onQuitApplication: function ssi_onQuitApplication(aData) { + if (aData == "restart") { + this._prefBranch.setBoolPref("sessionstore.resume_session_once", true); + // The browser:purge-session-history notification fires after the + // quit-application notification so unregister the + // browser:purge-session-history notification to prevent clearing + // session data on disk on a restart. It is also unnecessary to + // perform any other sanitization processing on a restart as the + // browser is about to exit anyway. + Services.obs.removeObserver(this, "browser:purge-session-history"); + } + + if (aData != "restart") { + // Throw away the previous session on shutdown + LastSession.clear(); + } + + this._uninit(); + }, + + /** + * On purge of session history + */ + onPurgeSessionHistory: function ssi_onPurgeSessionHistory() { + SessionFile.wipe(); + // If the browser is shutting down, simply return after clearing the + // session data on disk as this notification fires after the + // quit-application notification so the browser is about to exit. + if (RunState.isQuitting) + return; + LastSession.clear(); + + let openWindows = {}; + // Collect open windows. + this._forEachBrowserWindow(({__SSi: id}) => openWindows[id] = true); + + // also clear all data about closed tabs and windows + for (let ix in this._windows) { + if (ix in openWindows) { + this._windows[ix]._closedTabs = []; + } else { + delete this._windows[ix]; + } + } + // also clear all data about closed windows + this._closedWindows = []; + // give the tabbrowsers a chance to clear their histories first + var win = this._getMostRecentBrowserWindow(); + if (win) { + win.setTimeout(() => SessionSaver.run(), 0); + } else if (RunState.isRunning) { + SessionSaver.run(); + } + + this._clearRestoringWindows(); + this._saveableClosedWindowData = new WeakSet(); + }, + + /** + * On purge of domain data + * @param aData + * String domain data + */ + onPurgeDomainData: function ssi_onPurgeDomainData(aData) { + // does a session history entry contain a url for the given domain? + function containsDomain(aEntry) { + if (Utils.hasRootDomain(aEntry.url, aData)) { + return true; + } + return aEntry.children && aEntry.children.some(containsDomain, this); + } + // remove all closed tabs containing a reference to the given domain + for (let ix in this._windows) { + let closedTabs = this._windows[ix]._closedTabs; + for (let i = closedTabs.length - 1; i >= 0; i--) { + if (closedTabs[i].state.entries.some(containsDomain, this)) + closedTabs.splice(i, 1); + } + } + // remove all open & closed tabs containing a reference to the given + // domain in closed windows + for (let ix = this._closedWindows.length - 1; ix >= 0; ix--) { + let closedTabs = this._closedWindows[ix]._closedTabs; + let openTabs = this._closedWindows[ix].tabs; + let openTabCount = openTabs.length; + for (let i = closedTabs.length - 1; i >= 0; i--) + if (closedTabs[i].state.entries.some(containsDomain, this)) + closedTabs.splice(i, 1); + for (let j = openTabs.length - 1; j >= 0; j--) { + if (openTabs[j].entries.some(containsDomain, this)) { + openTabs.splice(j, 1); + if (this._closedWindows[ix].selected > j) + this._closedWindows[ix].selected--; + } + } + if (openTabs.length == 0) { + this._closedWindows.splice(ix, 1); + } + else if (openTabs.length != openTabCount) { + // Adjust the window's title if we removed an open tab + let selectedTab = openTabs[this._closedWindows[ix].selected - 1]; + // some duplication from restoreHistory - make sure we get the correct title + let activeIndex = (selectedTab.index || selectedTab.entries.length) - 1; + if (activeIndex >= selectedTab.entries.length) + activeIndex = selectedTab.entries.length - 1; + this._closedWindows[ix].title = selectedTab.entries[activeIndex].title; + } + } + + if (RunState.isRunning) { + SessionSaver.run(); + } + + this._clearRestoringWindows(); + }, + + /** + * On preference change + * @param aData + * String preference changed + */ + onPrefChange: function ssi_onPrefChange(aData) { + switch (aData) { + // if the user decreases the max number of closed tabs they want + // preserved update our internal states to match that max + case "sessionstore.max_tabs_undo": + this._max_tabs_undo = this._prefBranch.getIntPref("sessionstore.max_tabs_undo"); + for (let ix in this._windows) { + this._windows[ix]._closedTabs.splice(this._max_tabs_undo, this._windows[ix]._closedTabs.length); + } + break; + case "sessionstore.max_windows_undo": + this._max_windows_undo = this._prefBranch.getIntPref("sessionstore.max_windows_undo"); + this._capClosedWindows(); + break; + } + }, + + /** + * save state when new tab is added + * @param aWindow + * Window reference + */ + onTabAdd: function ssi_onTabAdd(aWindow) { + this.saveStateDelayed(aWindow); + }, + + /** + * set up listeners for a new tab + * @param aWindow + * Window reference + * @param aTab + * Tab reference + */ + onTabBrowserInserted: function ssi_onTabBrowserInserted(aWindow, aTab) { + let browser = aTab.linkedBrowser; + browser.addEventListener("SwapDocShells", this); + browser.addEventListener("oop-browser-crashed", this); + + if (browser.frameLoader) { + this._lastKnownFrameLoader.set(browser.permanentKey, browser.frameLoader); + } + }, + + /** + * remove listeners for a tab + * @param aWindow + * Window reference + * @param aTab + * Tab reference + * @param aNoNotification + * bool Do not save state if we're updating an existing tab + */ + onTabRemove: function ssi_onTabRemove(aWindow, aTab, aNoNotification) { + let browser = aTab.linkedBrowser; + browser.removeEventListener("SwapDocShells", this); + browser.removeEventListener("oop-browser-crashed", this); + + // If this tab was in the middle of restoring or still needs to be restored, + // we need to reset that state. If the tab was restoring, we will attempt to + // restore the next tab. + let previousState = browser.__SS_restoreState; + if (previousState) { + this._resetTabRestoringState(aTab); + if (previousState == TAB_STATE_RESTORING) + this.restoreNextTab(); + } + + if (!aNoNotification) { + this.saveStateDelayed(aWindow); + } + }, + + /** + * When a tab closes, collect its properties + * @param aWindow + * Window reference + * @param aTab + * Tab reference + */ + onTabClose: function ssi_onTabClose(aWindow, aTab) { + // notify the tabbrowser that the tab state will be retrieved for the last time + // (so that extension authors can easily set data on soon-to-be-closed tabs) + var event = aWindow.document.createEvent("Events"); + event.initEvent("SSTabClosing", true, false); + aTab.dispatchEvent(event); + + // don't update our internal state if we don't have to + if (this._max_tabs_undo == 0) { + return; + } + + // Get the latest data for this tab (generally, from the cache) + let tabState = TabState.collect(aTab); + + // Don't save private tabs + let isPrivateWindow = PrivateBrowsingUtils.isWindowPrivate(aWindow); + if (!isPrivateWindow && tabState.isPrivate) { + return; + } + + // Store closed-tab data for undo. + let tabbrowser = aWindow.gBrowser; + let tabTitle = this._replaceLoadingTitle(aTab.label, tabbrowser, aTab); + let {permanentKey} = aTab.linkedBrowser; + + let tabData = { + permanentKey, + state: tabState, + title: tabTitle, + image: tabbrowser.getIcon(aTab), + iconLoadingPrincipal: Utils.serializePrincipal(aTab.linkedBrowser.contentPrincipal), + pos: aTab._tPos, + closedAt: Date.now() + }; + + let closedTabs = this._windows[aWindow.__SSi]._closedTabs; + + // Determine whether the tab contains any information worth saving. Note + // that there might be pending state changes queued in the child that + // didn't reach the parent yet. If a tab is emptied before closing then we + // might still remove it from the list of closed tabs later. + if (this._shouldSaveTabState(tabState)) { + // Save the tab state, for now. We might push a valid tab out + // of the list but those cases should be extremely rare and + // do probably never occur when using the browser normally. + // (Tests or add-ons might do weird things though.) + this.saveClosedTabData(closedTabs, tabData); + } + + // Remember the closed tab to properly handle any last updates included in + // the final "update" message sent by the frame script's unload handler. + this._closedTabs.set(permanentKey, {closedTabs, tabData}); + }, + + /** + * Insert a given |tabData| object into the list of |closedTabs|. We will + * determine the right insertion point based on the .closedAt properties of + * all tabs already in the list. The list will be truncated to contain a + * maximum of |this._max_tabs_undo| entries. + * + * @param closedTabs (array) + * The list of closed tabs for a window. + * @param tabData (object) + * The tabData to be inserted. + */ + saveClosedTabData(closedTabs, tabData) { + // Find the index of the first tab in the list + // of closed tabs that was closed before our tab. + let index = closedTabs.findIndex(tab => { + return tab.closedAt < tabData.closedAt; + }); + + // If we found no tab closed before our + // tab then just append it to the list. + if (index == -1) { + index = closedTabs.length; + } + + // About to save the closed tab, add a unique ID. + tabData.closedId = this._nextClosedId++; + + // Insert tabData at the right position. + closedTabs.splice(index, 0, tabData); + + // Truncate the list of closed tabs, if needed. + if (closedTabs.length > this._max_tabs_undo) { + closedTabs.splice(this._max_tabs_undo, closedTabs.length); + } + }, + + /** + * Remove the closed tab data at |index| from the list of |closedTabs|. If + * the tab's final message is still pending we will simply discard it when + * it arrives so that the tab doesn't reappear in the list. + * + * @param closedTabs (array) + * The list of closed tabs for a window. + * @param index (uint) + * The index of the tab to remove. + */ + removeClosedTabData(closedTabs, index) { + // Remove the given index from the list. + let [closedTab] = closedTabs.splice(index, 1); + + // If the closed tab's state still has a .permanentKey property then we + // haven't seen its final update message yet. Remove it from the map of + // closed tabs so that we will simply discard its last messages and will + // not add it back to the list of closed tabs again. + if (closedTab.permanentKey) { + this._closedTabs.delete(closedTab.permanentKey); + this._closedWindowTabs.delete(closedTab.permanentKey); + delete closedTab.permanentKey; + } + + return closedTab; + }, + + /** + * When a tab is selected, save session data + * @param aWindow + * Window reference + */ + onTabSelect: function ssi_onTabSelect(aWindow) { + if (RunState.isRunning) { + this._windows[aWindow.__SSi].selected = aWindow.gBrowser.tabContainer.selectedIndex; + + let tab = aWindow.gBrowser.selectedTab; + let browser = tab.linkedBrowser; + + if (browser.__SS_restoreState && + browser.__SS_restoreState == TAB_STATE_NEEDS_RESTORE) { + // If __SS_restoreState is still on the browser and it is + // TAB_STATE_NEEDS_RESTORE, then then we haven't restored + // this tab yet. + // + // It's possible that this tab was recently revived, and that + // we've deferred showing the tab crashed page for it (if the + // tab crashed in the background). If so, we need to re-enter + // the crashed state, since we'll be showing the tab crashed + // page. + if (TabCrashHandler.willShowCrashedTab(browser)) { + this.enterCrashedState(browser); + } else { + this.restoreTabContent(tab); + } + } + } + }, + + onTabShow: function ssi_onTabShow(aWindow, aTab) { + // If the tab hasn't been restored yet, move it into the right bucket + if (aTab.linkedBrowser.__SS_restoreState && + aTab.linkedBrowser.__SS_restoreState == TAB_STATE_NEEDS_RESTORE) { + TabRestoreQueue.hiddenToVisible(aTab); + + // let's kick off tab restoration again to ensure this tab gets restored + // with "restore_hidden_tabs" == false (now that it has become visible) + this.restoreNextTab(); + } + + // Default delay of 2 seconds gives enough time to catch multiple TabShow + // events. This used to be due to changing groups in 'tab groups'. We + // might be able to get rid of this now? + this.saveStateDelayed(aWindow); + }, + + onTabHide: function ssi_onTabHide(aWindow, aTab) { + // If the tab hasn't been restored yet, move it into the right bucket + if (aTab.linkedBrowser.__SS_restoreState && + aTab.linkedBrowser.__SS_restoreState == TAB_STATE_NEEDS_RESTORE) { + TabRestoreQueue.visibleToHidden(aTab); + } + + // Default delay of 2 seconds gives enough time to catch multiple TabHide + // events. This used to be due to changing groups in 'tab groups'. We + // might be able to get rid of this now? + this.saveStateDelayed(aWindow); + }, + + /** + * Handler for the event that is fired when a <xul:browser> crashes. + * + * @param aWindow + * The window that the crashed browser belongs to. + * @param aBrowser + * The <xul:browser> that is now in the crashed state. + */ + onBrowserCrashed: function(aBrowser) { + NS_ASSERT(aBrowser.isRemoteBrowser, + "Only remote browsers should be able to crash"); + + this.enterCrashedState(aBrowser); + // The browser crashed so we might never receive flush responses. + // Resolve all pending flush requests for the crashed browser. + TabStateFlusher.resolveAll(aBrowser); + }, + + /** + * Called when a browser is showing or is about to show the tab + * crashed page. This method causes SessionStore to ignore the + * tab until it's restored. + * + * @param browser + * The <xul:browser> that is about to show the crashed page. + */ + enterCrashedState(browser) { + this._crashedBrowsers.add(browser.permanentKey); + + let win = browser.ownerGlobal; + + // If we hadn't yet restored, or were still in the midst of + // restoring this browser at the time of the crash, we need + // to reset its state so that we can try to restore it again + // when the user revives the tab from the crash. + if (browser.__SS_restoreState) { + let tab = win.gBrowser.getTabForBrowser(browser); + this._resetLocalTabRestoringState(tab); + } + }, + + // Clean up data that has been closed a long time ago. + // Do not reschedule a save. This will wait for the next regular + // save. + onIdleDaily: function() { + // Remove old closed windows + this._cleanupOldData([this._closedWindows]); + + // Remove closed tabs of closed windows + this._cleanupOldData(this._closedWindows.map((winData) => winData._closedTabs)); + + // Remove closed tabs of open windows + this._cleanupOldData(Object.keys(this._windows).map((key) => this._windows[key]._closedTabs)); + }, + + // Remove "old" data from an array + _cleanupOldData: function(targets) { + const TIME_TO_LIVE = this._prefBranch.getIntPref("sessionstore.cleanup.forget_closed_after"); + const now = Date.now(); + + for (let array of targets) { + for (let i = array.length - 1; i >= 0; --i) { + let data = array[i]; + // Make sure that we have a timestamp to tell us when the target + // has been closed. If we don't have a timestamp, default to a + // safe timestamp: just now. + data.closedAt = data.closedAt || now; + if (now - data.closedAt > TIME_TO_LIVE) { + array.splice(i, 1); + } + } + } + }, + + /* ........ nsISessionStore API .............. */ + + getBrowserState: function ssi_getBrowserState() { + let state = this.getCurrentState(); + + // Don't include the last session state in getBrowserState(). + delete state.lastSessionState; + + // Don't include any deferred initial state. + delete state.deferredInitialState; + + return JSON.stringify(state); + }, + + setBrowserState: function ssi_setBrowserState(aState) { + this._handleClosedWindows(); + + try { + var state = JSON.parse(aState); + } + catch (ex) { /* invalid state object - don't restore anything */ } + if (!state) { + throw Components.Exception("Invalid state string: not JSON", Cr.NS_ERROR_INVALID_ARG); + } + if (!state.windows) { + throw Components.Exception("No windows", Cr.NS_ERROR_INVALID_ARG); + } + + this._browserSetState = true; + + // Make sure the priority queue is emptied out + this._resetRestoringState(); + + var window = this._getMostRecentBrowserWindow(); + if (!window) { + this._restoreCount = 1; + this._openWindowWithState(state); + return; + } + + // close all other browser windows + this._forEachBrowserWindow(function(aWindow) { + if (aWindow != window) { + aWindow.close(); + this.onClose(aWindow); + } + }); + + // make sure closed window data isn't kept + this._closedWindows = []; + + // determine how many windows are meant to be restored + this._restoreCount = state.windows ? state.windows.length : 0; + + // global data must be restored before restoreWindow is called so that + // it happens before observers are notified + this._globalState.setFromState(state); + + // restore to the given state + this.restoreWindows(window, state, {overwriteTabs: true}); + }, + + getWindowState: function ssi_getWindowState(aWindow) { + if ("__SSi" in aWindow) { + return JSON.stringify(this._getWindowState(aWindow)); + } + + if (DyingWindowCache.has(aWindow)) { + let data = DyingWindowCache.get(aWindow); + return JSON.stringify({ windows: [data] }); + } + + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + }, + + setWindowState: function ssi_setWindowState(aWindow, aState, aOverwrite) { + if (!aWindow.__SSi) { + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + + this.restoreWindows(aWindow, aState, {overwriteTabs: aOverwrite}); + }, + + getTabState: function ssi_getTabState(aTab) { + if (!aTab.ownerGlobal.__SSi) { + throw Components.Exception("Default view is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + + let tabState = TabState.collect(aTab); + + return JSON.stringify(tabState); + }, + + setTabState(aTab, aState) { + // Remove the tab state from the cache. + // Note that we cannot simply replace the contents of the cache + // as |aState| can be an incomplete state that will be completed + // by |restoreTabs|. + let tabState = JSON.parse(aState); + if (!tabState) { + throw Components.Exception("Invalid state string: not JSON", Cr.NS_ERROR_INVALID_ARG); + } + if (typeof tabState != "object") { + throw Components.Exception("Not an object", Cr.NS_ERROR_INVALID_ARG); + } + if (!("entries" in tabState)) { + throw Components.Exception("Invalid state object: no entries", Cr.NS_ERROR_INVALID_ARG); + } + + let window = aTab.ownerGlobal; + if (!("__SSi" in window)) { + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + + if (aTab.linkedBrowser.__SS_restoreState) { + this._resetTabRestoringState(aTab); + } + + this.restoreTab(aTab, tabState); + }, + + duplicateTab: function ssi_duplicateTab(aWindow, aTab, aDelta = 0, aRestoreImmediately = true) { + if (!aTab.ownerGlobal.__SSi) { + throw Components.Exception("Default view is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + if (!aWindow.gBrowser) { + throw Components.Exception("Invalid window object: no gBrowser", Cr.NS_ERROR_INVALID_ARG); + } + + // Create a new tab. + let userContextId = aTab.getAttribute("usercontextid"); + let newTab = aTab == aWindow.gBrowser.selectedTab ? + aWindow.gBrowser.addTab(null, {relatedToCurrent: true, ownerTab: aTab, userContextId}) : + aWindow.gBrowser.addTab(null, {userContextId}); + + // Set tab title to "Connecting..." and start the throbber to pretend we're + // doing something while actually waiting for data from the frame script. + aWindow.gBrowser.setTabTitleLoading(newTab); + newTab.setAttribute("busy", "true"); + + // Collect state before flushing. + let tabState = TabState.clone(aTab); + + // Flush to get the latest tab state to duplicate. + let browser = aTab.linkedBrowser; + TabStateFlusher.flush(browser).then(() => { + // The new tab might have been closed in the meantime. + if (newTab.closing || !newTab.linkedBrowser) { + return; + } + + let window = newTab.ownerGlobal; + + // The tab or its window might be gone. + if (!window || !window.__SSi) { + return; + } + + // Update state with flushed data. We can't use TabState.clone() here as + // the tab to duplicate may have already been closed. In that case we + // only have access to the <xul:browser>. + let options = {includePrivateData: true}; + TabState.copyFromCache(browser, tabState, options); + + tabState.index += aDelta; + tabState.index = Math.max(1, Math.min(tabState.index, tabState.entries.length)); + tabState.pinned = false; + + // Restore the state into the new tab. + this.restoreTab(newTab, tabState, { + restoreImmediately: aRestoreImmediately + }); + }); + + return newTab; + }, + + getClosedTabCount: function ssi_getClosedTabCount(aWindow) { + if ("__SSi" in aWindow) { + return this._windows[aWindow.__SSi]._closedTabs.length; + } + + if (!DyingWindowCache.has(aWindow)) { + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + + return DyingWindowCache.get(aWindow)._closedTabs.length; + }, + + getClosedTabData: function ssi_getClosedTabData(aWindow, aAsString = true) { + if ("__SSi" in aWindow) { + return aAsString ? + JSON.stringify(this._windows[aWindow.__SSi]._closedTabs) : + Cu.cloneInto(this._windows[aWindow.__SSi]._closedTabs, {}); + } + + if (!DyingWindowCache.has(aWindow)) { + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + + let data = DyingWindowCache.get(aWindow); + return aAsString ? JSON.stringify(data._closedTabs) : Cu.cloneInto(data._closedTabs, {}); + }, + + undoCloseTab: function ssi_undoCloseTab(aWindow, aIndex) { + if (!aWindow.__SSi) { + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + + var closedTabs = this._windows[aWindow.__SSi]._closedTabs; + + // default to the most-recently closed tab + aIndex = aIndex || 0; + if (!(aIndex in closedTabs)) { + throw Components.Exception("Invalid index: not in the closed tabs", Cr.NS_ERROR_INVALID_ARG); + } + + // fetch the data of closed tab, while removing it from the array + let {state, pos} = this.removeClosedTabData(closedTabs, aIndex); + + // create a new tab + let tabbrowser = aWindow.gBrowser; + let tab = tabbrowser.selectedTab = tabbrowser.addTab(null, state); + + // restore tab content + this.restoreTab(tab, state); + + // restore the tab's position + tabbrowser.moveTabTo(tab, pos); + + // focus the tab's content area (bug 342432) + tab.linkedBrowser.focus(); + + return tab; + }, + + forgetClosedTab: function ssi_forgetClosedTab(aWindow, aIndex) { + if (!aWindow.__SSi) { + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + + var closedTabs = this._windows[aWindow.__SSi]._closedTabs; + + // default to the most-recently closed tab + aIndex = aIndex || 0; + if (!(aIndex in closedTabs)) { + throw Components.Exception("Invalid index: not in the closed tabs", Cr.NS_ERROR_INVALID_ARG); + } + + // remove closed tab from the array + this.removeClosedTabData(closedTabs, aIndex); + }, + + getClosedWindowCount: function ssi_getClosedWindowCount() { + return this._closedWindows.length; + }, + + getClosedWindowData: function ssi_getClosedWindowData(aAsString = true) { + return aAsString ? JSON.stringify(this._closedWindows) : Cu.cloneInto(this._closedWindows, {}); + }, + + undoCloseWindow: function ssi_undoCloseWindow(aIndex) { + if (!(aIndex in this._closedWindows)) { + throw Components.Exception("Invalid index: not in the closed windows", Cr.NS_ERROR_INVALID_ARG); + } + + // reopen the window + let state = { windows: this._closedWindows.splice(aIndex, 1) }; + delete state.windows[0].closedAt; // Window is now open. + + let window = this._openWindowWithState(state); + this.windowToFocus = window; + return window; + }, + + forgetClosedWindow: function ssi_forgetClosedWindow(aIndex) { + // default to the most-recently closed window + aIndex = aIndex || 0; + if (!(aIndex in this._closedWindows)) { + throw Components.Exception("Invalid index: not in the closed windows", Cr.NS_ERROR_INVALID_ARG); + } + + // remove closed window from the array + let winData = this._closedWindows[aIndex]; + this._closedWindows.splice(aIndex, 1); + this._saveableClosedWindowData.delete(winData); + }, + + getWindowValue: function ssi_getWindowValue(aWindow, aKey) { + if ("__SSi" in aWindow) { + var data = this._windows[aWindow.__SSi].extData || {}; + return data[aKey] || ""; + } + + if (DyingWindowCache.has(aWindow)) { + let data = DyingWindowCache.get(aWindow).extData || {}; + return data[aKey] || ""; + } + + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + }, + + setWindowValue: function ssi_setWindowValue(aWindow, aKey, aStringValue) { + if (typeof aStringValue != "string") { + throw new TypeError("setWindowValue only accepts string values"); + } + + if (!("__SSi" in aWindow)) { + throw Components.Exception("Window is not tracked", Cr.NS_ERROR_INVALID_ARG); + } + if (!this._windows[aWindow.__SSi].extData) { + this._windows[aWindow.__SSi].extData = {}; + } + this._windows[aWindow.__SSi].extData[aKey] = aStringValue; + this.saveStateDelayed(aWindow); + }, + + deleteWindowValue: function ssi_deleteWindowValue(aWindow, aKey) { + if (aWindow.__SSi && this._windows[aWindow.__SSi].extData && + this._windows[aWindow.__SSi].extData[aKey]) + delete this._windows[aWindow.__SSi].extData[aKey]; + this.saveStateDelayed(aWindow); + }, + + getTabValue: function ssi_getTabValue(aTab, aKey) { + return (aTab.__SS_extdata || {})[aKey] || ""; + }, + + setTabValue: function ssi_setTabValue(aTab, aKey, aStringValue) { + if (typeof aStringValue != "string") { + throw new TypeError("setTabValue only accepts string values"); + } + + // If the tab hasn't been restored, then set the data there, otherwise we + // could lose newly added data. + if (!aTab.__SS_extdata) { + aTab.__SS_extdata = {}; + } + + aTab.__SS_extdata[aKey] = aStringValue; + this.saveStateDelayed(aTab.ownerGlobal); + }, + + deleteTabValue: function ssi_deleteTabValue(aTab, aKey) { + if (aTab.__SS_extdata && aKey in aTab.__SS_extdata) { + delete aTab.__SS_extdata[aKey]; + this.saveStateDelayed(aTab.ownerGlobal); + } + }, + + getGlobalValue: function ssi_getGlobalValue(aKey) { + return this._globalState.get(aKey); + }, + + setGlobalValue: function ssi_setGlobalValue(aKey, aStringValue) { + if (typeof aStringValue != "string") { + throw new TypeError("setGlobalValue only accepts string values"); + } + + this._globalState.set(aKey, aStringValue); + this.saveStateDelayed(); + }, + + deleteGlobalValue: function ssi_deleteGlobalValue(aKey) { + this._globalState.delete(aKey); + this.saveStateDelayed(); + }, + + persistTabAttribute: function ssi_persistTabAttribute(aName) { + if (TabAttributes.persist(aName)) { + this.saveStateDelayed(); + } + }, + + + /** + * Undoes the closing of a tab or window which corresponds + * to the closedId passed in. + * + * @param aClosedId + * The closedId of the tab or window + * + * @returns a tab or window object + */ + undoCloseById(aClosedId) { + // Check for a window first. + for (let i = 0, l = this._closedWindows.length; i < l; i++) { + if (this._closedWindows[i].closedId == aClosedId) { + return this.undoCloseWindow(i); + } + } + + // Check for a tab. + let windowsEnum = Services.wm.getEnumerator("navigator:browser"); + while (windowsEnum.hasMoreElements()) { + let window = windowsEnum.getNext(); + let windowState = this._windows[window.__SSi]; + if (windowState) { + for (let j = 0, l = windowState._closedTabs.length; j < l; j++) { + if (windowState._closedTabs[j].closedId == aClosedId) { + return this.undoCloseTab(window, j); + } + } + } + } + + // Neither a tab nor a window was found, return undefined and let the caller decide what to do about it. + return undefined; + }, + + /** + * Restores the session state stored in LastSession. This will attempt + * to merge data into the current session. If a window was opened at startup + * with pinned tab(s), then the remaining data from the previous session for + * that window will be opened into that window. Otherwise new windows will + * be opened. + */ + restoreLastSession: function ssi_restoreLastSession() { + // Use the public getter since it also checks PB mode + if (!this.canRestoreLastSession) { + throw Components.Exception("Last session can not be restored"); + } + + Services.obs.notifyObservers(null, NOTIFY_INITIATING_MANUAL_RESTORE, ""); + + // First collect each window with its id... + let windows = {}; + this._forEachBrowserWindow(function(aWindow) { + if (aWindow.__SS_lastSessionWindowID) + windows[aWindow.__SS_lastSessionWindowID] = aWindow; + }); + + let lastSessionState = LastSession.getState(); + + // This shouldn't ever be the case... + if (!lastSessionState.windows.length) { + throw Components.Exception("lastSessionState has no windows", Cr.NS_ERROR_UNEXPECTED); + } + + // We're technically doing a restore, so set things up so we send the + // notification when we're done. We want to send "sessionstore-browser-state-restored". + this._restoreCount = lastSessionState.windows.length; + this._browserSetState = true; + + // We want to re-use the last opened window instead of opening a new one in + // the case where it's "empty" and not associated with a window in the session. + // We will do more processing via _prepWindowToRestoreInto if we need to use + // the lastWindow. + let lastWindow = this._getMostRecentBrowserWindow(); + let canUseLastWindow = lastWindow && + !lastWindow.__SS_lastSessionWindowID; + + // global data must be restored before restoreWindow is called so that + // it happens before observers are notified + this._globalState.setFromState(lastSessionState); + + // Restore into windows or open new ones as needed. + for (let i = 0; i < lastSessionState.windows.length; i++) { + let winState = lastSessionState.windows[i]; + let lastSessionWindowID = winState.__lastSessionWindowID; + // delete lastSessionWindowID so we don't add that to the window again + delete winState.__lastSessionWindowID; + + // See if we can use an open window. First try one that is associated with + // the state we're trying to restore and then fallback to the last selected + // window. + let windowToUse = windows[lastSessionWindowID]; + if (!windowToUse && canUseLastWindow) { + windowToUse = lastWindow; + canUseLastWindow = false; + } + + let [canUseWindow, canOverwriteTabs] = this._prepWindowToRestoreInto(windowToUse); + + // If there's a window already open that we can restore into, use that + if (canUseWindow) { + // Since we're not overwriting existing tabs, we want to merge _closedTabs, + // putting existing ones first. Then make sure we're respecting the max pref. + if (winState._closedTabs && winState._closedTabs.length) { + let curWinState = this._windows[windowToUse.__SSi]; + curWinState._closedTabs = curWinState._closedTabs.concat(winState._closedTabs); + curWinState._closedTabs.splice(this._max_tabs_undo, curWinState._closedTabs.length); + } + + // Restore into that window - pretend it's a followup since we'll already + // have a focused window. + //XXXzpao This is going to merge extData together (taking what was in + // winState over what is in the window already. + let options = {overwriteTabs: canOverwriteTabs, isFollowUp: true}; + this.restoreWindow(windowToUse, winState, options); + } + else { + this._openWindowWithState({ windows: [winState] }); + } + } + + // Merge closed windows from this session with ones from last session + if (lastSessionState._closedWindows) { + this._closedWindows = this._closedWindows.concat(lastSessionState._closedWindows); + this._capClosedWindows(); + } + + if (lastSessionState.scratchpads) { + ScratchpadManager.restoreSession(lastSessionState.scratchpads); + } + + // Set data that persists between sessions + this._recentCrashes = lastSessionState.session && + lastSessionState.session.recentCrashes || 0; + + // Update the session start time using the restored session state. + this._updateSessionStartTime(lastSessionState); + + LastSession.clear(); + }, + + /** + * Revive a crashed tab and restore its state from before it crashed. + * + * @param aTab + * A <xul:tab> linked to a crashed browser. This is a no-op if the + * browser hasn't actually crashed, or is not associated with a tab. + * This function will also throw if the browser happens to be remote. + */ + reviveCrashedTab(aTab) { + if (!aTab) { + throw new Error("SessionStore.reviveCrashedTab expected a tab, but got null."); + } + + let browser = aTab.linkedBrowser; + if (!this._crashedBrowsers.has(browser.permanentKey)) { + return; + } + + // Sanity check - the browser to be revived should not be remote + // at this point. + if (browser.isRemoteBrowser) { + throw new Error("SessionStore.reviveCrashedTab: " + + "Somehow a crashed browser is still remote.") + } + + // We put the browser at about:blank in case the user is + // restoring tabs on demand. This way, the user won't see + // a flash of the about:tabcrashed page after selecting + // the revived tab. + aTab.removeAttribute("crashed"); + browser.loadURI("about:blank", null, null); + + let data = TabState.collect(aTab); + this.restoreTab(aTab, data, { + forceOnDemand: true, + }); + }, + + /** + * Revive all crashed tabs and reset the crashed tabs count to 0. + */ + reviveAllCrashedTabs() { + let windowsEnum = Services.wm.getEnumerator("navigator:browser"); + while (windowsEnum.hasMoreElements()) { + let window = windowsEnum.getNext(); + for (let tab of window.gBrowser.tabs) { + this.reviveCrashedTab(tab); + } + } + }, + + /** + * Navigate the given |tab| by first collecting its current state and then + * either changing only the index of the currently shown history entry, + * or restoring the exact same state again and passing the new URL to load + * in |loadArguments|. Use this method to seamlessly switch between pages + * loaded in the parent and pages loaded in the child process. + * + * This method might be called multiple times before it has finished + * flushing the browser tab. If that occurs, the loadArguments from + * the most recent call to navigateAndRestore will be used once the + * flush has finished. + */ + navigateAndRestore(tab, loadArguments, historyIndex) { + let window = tab.ownerGlobal; + NS_ASSERT(window.__SSi, "tab's window must be tracked"); + let browser = tab.linkedBrowser; + + // Were we already waiting for a flush from a previous call to + // navigateAndRestore on this tab? + let alreadyRestoring = + this._remotenessChangingBrowsers.has(browser.permanentKey); + + // Stash the most recent loadArguments in this WeakMap so that + // we know to use it when the TabStateFlusher.flush resolves. + this._remotenessChangingBrowsers.set(browser.permanentKey, loadArguments); + + if (alreadyRestoring) { + // This tab was already being restored to run in the + // correct process. We're done here. + return; + } + + // Set tab title to "Connecting..." and start the throbber to pretend we're + // doing something while actually waiting for data from the frame script. + window.gBrowser.setTabTitleLoading(tab); + tab.setAttribute("busy", "true"); + + // Flush to get the latest tab state. + TabStateFlusher.flush(browser).then(() => { + // loadArguments might have been overwritten by multiple calls + // to navigateAndRestore while we waited for the tab to flush, + // so we use the most recently stored one. + let recentLoadArguments = + this._remotenessChangingBrowsers.get(browser.permanentKey); + this._remotenessChangingBrowsers.delete(browser.permanentKey); + + // The tab might have been closed/gone in the meantime. + if (tab.closing || !tab.linkedBrowser) { + return; + } + + let window = tab.ownerGlobal; + + // The tab or its window might be gone. + if (!window || !window.__SSi || window.closed) { + return; + } + + let tabState = TabState.clone(tab); + let options = { + restoreImmediately: true, + // We want to make sure that this information is passed to restoreTab + // whether or not a historyIndex is passed in. Thus, we extract it from + // the loadArguments. + reloadInFreshProcess: !!recentLoadArguments.reloadInFreshProcess, + }; + + if (historyIndex >= 0) { + tabState.index = historyIndex + 1; + tabState.index = Math.max(1, Math.min(tabState.index, tabState.entries.length)); + } else { + options.loadArguments = recentLoadArguments; + } + + // Need to reset restoring tabs. + if (tab.linkedBrowser.__SS_restoreState) { + this._resetLocalTabRestoringState(tab); + } + + // Restore the state into the tab. + this.restoreTab(tab, tabState, options); + }); + + tab.linkedBrowser.__SS_restoreState = TAB_STATE_WILL_RESTORE; + }, + + /** + * Retrieves the latest session history information for a tab. The cached data + * is returned immediately, but a callback may be provided that supplies + * up-to-date data when or if it is available. The callback is passed a single + * argument with data in the same format as the return value. + * + * @param tab tab to retrieve the session history for + * @param updatedCallback function to call with updated data as the single argument + * @returns a object containing 'index' specifying the current index, and an + * array 'entries' containing an object for each history item. + */ + getSessionHistory(tab, updatedCallback) { + if (updatedCallback) { + TabStateFlusher.flush(tab.linkedBrowser).then(() => { + let sessionHistory = this.getSessionHistory(tab); + if (sessionHistory) { + updatedCallback(sessionHistory); + } + }); + } + + // Don't continue if the tab was closed before TabStateFlusher.flush resolves. + if (tab.linkedBrowser) { + let tabState = TabState.collect(tab); + return { index: tabState.index - 1, entries: tabState.entries } + } + }, + + /** + * See if aWindow is usable for use when restoring a previous session via + * restoreLastSession. If usable, prepare it for use. + * + * @param aWindow + * the window to inspect & prepare + * @returns [canUseWindow, canOverwriteTabs] + * canUseWindow: can the window be used to restore into + * canOverwriteTabs: all of the current tabs are home pages and we + * can overwrite them + */ + _prepWindowToRestoreInto: function ssi_prepWindowToRestoreInto(aWindow) { + if (!aWindow) + return [false, false]; + + // We might be able to overwrite the existing tabs instead of just adding + // the previous session's tabs to the end. This will be set if possible. + let canOverwriteTabs = false; + + // Look at the open tabs in comparison to home pages. If all the tabs are + // home pages then we'll end up overwriting all of them. Otherwise we'll + // just close the tabs that match home pages. Tabs with the about:blank + // URI will always be overwritten. + let homePages = ["about:blank"]; + let removableTabs = []; + let tabbrowser = aWindow.gBrowser; + let normalTabsLen = tabbrowser.tabs.length - tabbrowser._numPinnedTabs; + let startupPref = this._prefBranch.getIntPref("startup.page"); + if (startupPref == 1) + homePages = homePages.concat(aWindow.gHomeButton.getHomePage().split("|")); + + for (let i = tabbrowser._numPinnedTabs; i < tabbrowser.tabs.length; i++) { + let tab = tabbrowser.tabs[i]; + if (homePages.indexOf(tab.linkedBrowser.currentURI.spec) != -1) { + removableTabs.push(tab); + } + } + + if (tabbrowser.tabs.length == removableTabs.length) { + canOverwriteTabs = true; + } + else { + // If we're not overwriting all of the tabs, then close the home tabs. + for (let i = removableTabs.length - 1; i >= 0; i--) { + tabbrowser.removeTab(removableTabs.pop(), { animate: false }); + } + } + + return [true, canOverwriteTabs]; + }, + + /* ........ Saving Functionality .............. */ + + /** + * Store window dimensions, visibility, sidebar + * @param aWindow + * Window reference + */ + _updateWindowFeatures: function ssi_updateWindowFeatures(aWindow) { + var winData = this._windows[aWindow.__SSi]; + + WINDOW_ATTRIBUTES.forEach(function(aAttr) { + winData[aAttr] = this._getWindowDimension(aWindow, aAttr); + }, this); + + var hidden = WINDOW_HIDEABLE_FEATURES.filter(function(aItem) { + return aWindow[aItem] && !aWindow[aItem].visible; + }); + if (hidden.length != 0) + winData.hidden = hidden.join(","); + else if (winData.hidden) + delete winData.hidden; + + var sidebar = aWindow.document.getElementById("sidebar-box").getAttribute("sidebarcommand"); + if (sidebar) + winData.sidebar = sidebar; + else if (winData.sidebar) + delete winData.sidebar; + }, + + /** + * gather session data as object + * @param aUpdateAll + * Bool update all windows + * @returns object + */ + getCurrentState: function (aUpdateAll) { + this._handleClosedWindows(); + + var activeWindow = this._getMostRecentBrowserWindow(); + + TelemetryStopwatch.start("FX_SESSION_RESTORE_COLLECT_ALL_WINDOWS_DATA_MS"); + if (RunState.isRunning) { + // update the data for all windows with activities since the last save operation + this._forEachBrowserWindow(function(aWindow) { + if (!this._isWindowLoaded(aWindow)) // window data is still in _statesToRestore + return; + if (aUpdateAll || DirtyWindows.has(aWindow) || aWindow == activeWindow) { + this._collectWindowData(aWindow); + } + else { // always update the window features (whose change alone never triggers a save operation) + this._updateWindowFeatures(aWindow); + } + }); + DirtyWindows.clear(); + } + TelemetryStopwatch.finish("FX_SESSION_RESTORE_COLLECT_ALL_WINDOWS_DATA_MS"); + + // An array that at the end will hold all current window data. + var total = []; + // The ids of all windows contained in 'total' in the same order. + var ids = []; + // The number of window that are _not_ popups. + var nonPopupCount = 0; + var ix; + + // collect the data for all windows + for (ix in this._windows) { + if (this._windows[ix]._restoring) // window data is still in _statesToRestore + continue; + total.push(this._windows[ix]); + ids.push(ix); + if (!this._windows[ix].isPopup) + nonPopupCount++; + } + + TelemetryStopwatch.start("FX_SESSION_RESTORE_COLLECT_COOKIES_MS"); + SessionCookies.update(total); + TelemetryStopwatch.finish("FX_SESSION_RESTORE_COLLECT_COOKIES_MS"); + + // collect the data for all windows yet to be restored + for (ix in this._statesToRestore) { + for (let winData of this._statesToRestore[ix].windows) { + total.push(winData); + if (!winData.isPopup) + nonPopupCount++; + } + } + + // shallow copy this._closedWindows to preserve current state + let lastClosedWindowsCopy = this._closedWindows.slice(); + + if (AppConstants.platform != "macosx") { + // If no non-popup browser window remains open, return the state of the last + // closed window(s). We only want to do this when we're actually "ending" + // the session. + //XXXzpao We should do this for _restoreLastWindow == true, but that has + // its own check for popups. c.f. bug 597619 + if (nonPopupCount == 0 && lastClosedWindowsCopy.length > 0 && + RunState.isQuitting) { + // prepend the last non-popup browser window, so that if the user loads more tabs + // at startup we don't accidentally add them to a popup window + do { + total.unshift(lastClosedWindowsCopy.shift()) + } while (total[0].isPopup && lastClosedWindowsCopy.length > 0) + } + } + + if (activeWindow) { + this.activeWindowSSiCache = activeWindow.__SSi || ""; + } + ix = ids.indexOf(this.activeWindowSSiCache); + // We don't want to restore focus to a minimized window or a window which had all its + // tabs stripped out (doesn't exist). + if (ix != -1 && total[ix] && total[ix].sizemode == "minimized") + ix = -1; + + let session = { + lastUpdate: Date.now(), + startTime: this._sessionStartTime, + recentCrashes: this._recentCrashes + }; + + let state = { + version: ["sessionrestore", FORMAT_VERSION], + windows: total, + selectedWindow: ix + 1, + _closedWindows: lastClosedWindowsCopy, + session: session, + global: this._globalState.getState() + }; + + if (Cu.isModuleLoaded("resource://devtools/client/scratchpad/scratchpad-manager.jsm")) { + // get open Scratchpad window states too + let scratchpads = ScratchpadManager.getSessionState(); + if (scratchpads && scratchpads.length) { + state.scratchpads = scratchpads; + } + } + + // Persist the last session if we deferred restoring it + if (LastSession.canRestore) { + state.lastSessionState = LastSession.getState(); + } + + // If we were called by the SessionSaver and started with only a private + // window we want to pass the deferred initial state to not lose the + // previous session. + if (this._deferredInitialState) { + state.deferredInitialState = this._deferredInitialState; + } + + return state; + }, + + /** + * serialize session data for a window + * @param aWindow + * Window reference + * @returns string + */ + _getWindowState: function ssi_getWindowState(aWindow) { + if (!this._isWindowLoaded(aWindow)) + return this._statesToRestore[aWindow.__SS_restoreID]; + + if (RunState.isRunning) { + this._collectWindowData(aWindow); + } + + let windows = [this._windows[aWindow.__SSi]]; + SessionCookies.update(windows); + + return { windows: windows }; + }, + + /** + * Gathers data about a window and its tabs, and updates its + * entry in this._windows. + * + * @param aWindow + * Window references. + * @returns a Map mapping the browser tabs from aWindow to the tab + * entry that was put into the window data in this._windows. + */ + _collectWindowData: function ssi_collectWindowData(aWindow) { + let tabMap = new Map(); + + if (!this._isWindowLoaded(aWindow)) + return tabMap; + + let tabbrowser = aWindow.gBrowser; + let tabs = tabbrowser.tabs; + let winData = this._windows[aWindow.__SSi]; + let tabsData = winData.tabs = []; + + // update the internal state data for this window + for (let tab of tabs) { + let tabData = TabState.collect(tab); + tabMap.set(tab, tabData); + tabsData.push(tabData); + } + winData.selected = tabbrowser.mTabBox.selectedIndex + 1; + + this._updateWindowFeatures(aWindow); + + // Make sure we keep __SS_lastSessionWindowID around for cases like entering + // or leaving PB mode. + if (aWindow.__SS_lastSessionWindowID) + this._windows[aWindow.__SSi].__lastSessionWindowID = + aWindow.__SS_lastSessionWindowID; + + DirtyWindows.remove(aWindow); + return tabMap; + }, + + /* ........ Restoring Functionality .............. */ + + /** + * restore features to a single window + * @param aWindow + * Window reference to the window to use for restoration + * @param winData + * JS object + * @param aOptions + * {overwriteTabs: true} to overwrite existing tabs w/ new ones + * {isFollowUp: true} if this is not the restoration of the 1st window + * {firstWindow: true} if this is the first non-private window we're + * restoring in this session, that might open an + * external link as well + */ + restoreWindow: function ssi_restoreWindow(aWindow, winData, aOptions = {}) { + let overwriteTabs = aOptions && aOptions.overwriteTabs; + let isFollowUp = aOptions && aOptions.isFollowUp; + let firstWindow = aOptions && aOptions.firstWindow; + + if (isFollowUp) { + this.windowToFocus = aWindow; + } + + // initialize window if necessary + if (aWindow && (!aWindow.__SSi || !this._windows[aWindow.__SSi])) + this.onLoad(aWindow); + + TelemetryStopwatch.start("FX_SESSION_RESTORE_RESTORE_WINDOW_MS"); + + // We're not returning from this before we end up calling restoreTabs + // for this window, so make sure we send the SSWindowStateBusy event. + this._setWindowStateBusy(aWindow); + + if (!winData.tabs) { + winData.tabs = []; + } + + // don't restore a single blank tab when we've had an external + // URL passed in for loading at startup (cf. bug 357419) + else if (firstWindow && !overwriteTabs && winData.tabs.length == 1 && + (!winData.tabs[0].entries || winData.tabs[0].entries.length == 0)) { + winData.tabs = []; + } + + var tabbrowser = aWindow.gBrowser; + var openTabCount = overwriteTabs ? tabbrowser.browsers.length : -1; + var newTabCount = winData.tabs.length; + var tabs = []; + + // disable smooth scrolling while adding, moving, removing and selecting tabs + var tabstrip = tabbrowser.tabContainer.mTabstrip; + var smoothScroll = tabstrip.smoothScroll; + tabstrip.smoothScroll = false; + + // unpin all tabs to ensure they are not reordered in the next loop + if (overwriteTabs) { + for (let t = tabbrowser._numPinnedTabs - 1; t > -1; t--) + tabbrowser.unpinTab(tabbrowser.tabs[t]); + } + + // We need to keep track of the initially open tabs so that they + // can be moved to the end of the restored tabs. + let initialTabs = []; + if (!overwriteTabs && firstWindow) { + initialTabs = Array.slice(tabbrowser.tabs); + } + + // make sure that the selected tab won't be closed in order to + // prevent unnecessary flickering + if (overwriteTabs && tabbrowser.selectedTab._tPos >= newTabCount) + tabbrowser.moveTabTo(tabbrowser.selectedTab, newTabCount - 1); + + let numVisibleTabs = 0; + + for (var t = 0; t < newTabCount; t++) { + // When trying to restore into existing tab, we also take the userContextId + // into account if present. + let userContextId = winData.tabs[t].userContextId; + let reuseExisting = t < openTabCount && + (tabbrowser.tabs[t].getAttribute("usercontextid") == (userContextId || "")); + // If the tab is pinned, then we'll be loading it right away, and + // there's no need to cause a remoteness flip by loading it initially + // non-remote. + let forceNotRemote = !winData.tabs[t].pinned; + let tab = reuseExisting ? tabbrowser.tabs[t] : + tabbrowser.addTab("about:blank", + {skipAnimation: true, + forceNotRemote, + userContextId}); + + // If we inserted a new tab because the userContextId didn't match with the + // open tab, even though `t < openTabCount`, we need to remove that open tab + // and put the newly added tab in its place. + if (!reuseExisting && t < openTabCount) { + tabbrowser.removeTab(tabbrowser.tabs[t]); + tabbrowser.moveTabTo(tab, t); + } + + tabs.push(tab); + + if (winData.tabs[t].pinned) + tabbrowser.pinTab(tabs[t]); + + if (winData.tabs[t].hidden) { + tabbrowser.hideTab(tabs[t]); + } + else { + tabbrowser.showTab(tabs[t]); + numVisibleTabs++; + } + + if (!!winData.tabs[t].muted != tabs[t].linkedBrowser.audioMuted) { + tabs[t].toggleMuteAudio(winData.tabs[t].muteReason); + } + } + + if (!overwriteTabs && firstWindow) { + // Move the originally open tabs to the end + let endPosition = tabbrowser.tabs.length - 1; + for (let i = 0; i < initialTabs.length; i++) { + tabbrowser.moveTabTo(initialTabs[i], endPosition); + } + } + + // if all tabs to be restored are hidden, make the first one visible + if (!numVisibleTabs && winData.tabs.length) { + winData.tabs[0].hidden = false; + tabbrowser.showTab(tabs[0]); + } + + // If overwriting tabs, we want to reset each tab's "restoring" state. Since + // we're overwriting those tabs, they should no longer be restoring. The + // tabs will be rebuilt and marked if they need to be restored after loading + // state (in restoreTabs). + if (overwriteTabs) { + for (let i = 0; i < tabbrowser.tabs.length; i++) { + let tab = tabbrowser.tabs[i]; + if (tabbrowser.browsers[i].__SS_restoreState) + this._resetTabRestoringState(tab); + } + } + + // We want to correlate the window with data from the last session, so + // assign another id if we have one. Otherwise clear so we don't do + // anything with it. + delete aWindow.__SS_lastSessionWindowID; + if (winData.__lastSessionWindowID) + aWindow.__SS_lastSessionWindowID = winData.__lastSessionWindowID; + + // when overwriting tabs, remove all superflous ones + if (overwriteTabs && newTabCount < openTabCount) { + Array.slice(tabbrowser.tabs, newTabCount, openTabCount) + .forEach(tabbrowser.removeTab, tabbrowser); + } + + if (overwriteTabs) { + this.restoreWindowFeatures(aWindow, winData); + delete this._windows[aWindow.__SSi].extData; + } + if (winData.cookies) { + SessionCookies.restore(winData.cookies); + } + if (winData.extData) { + if (!this._windows[aWindow.__SSi].extData) { + this._windows[aWindow.__SSi].extData = {}; + } + for (var key in winData.extData) { + this._windows[aWindow.__SSi].extData[key] = winData.extData[key]; + } + } + + let newClosedTabsData = winData._closedTabs || []; + + if (overwriteTabs || firstWindow) { + // Overwrite existing closed tabs data when overwriteTabs=true + // or we're the first window to be restored. + this._windows[aWindow.__SSi]._closedTabs = newClosedTabsData; + } else if (this._max_tabs_undo > 0) { + // If we merge tabs, we also want to merge closed tabs data. We'll assume + // the restored tabs were closed more recently and append the current list + // of closed tabs to the new one... + newClosedTabsData = + newClosedTabsData.concat(this._windows[aWindow.__SSi]._closedTabs); + + // ... and make sure that we don't exceed the max number of closed tabs + // we can restore. + this._windows[aWindow.__SSi]._closedTabs = + newClosedTabsData.slice(0, this._max_tabs_undo); + } + + // Restore tabs, if any. + if (winData.tabs.length) { + this.restoreTabs(aWindow, tabs, winData.tabs, + (overwriteTabs ? (parseInt(winData.selected || "1")) : 0)); + } + + // set smoothScroll back to the original value + tabstrip.smoothScroll = smoothScroll; + + TelemetryStopwatch.finish("FX_SESSION_RESTORE_RESTORE_WINDOW_MS"); + + this._setWindowStateReady(aWindow); + + this._sendWindowRestoredNotification(aWindow); + + Services.obs.notifyObservers(aWindow, NOTIFY_SINGLE_WINDOW_RESTORED, ""); + + this._sendRestoreCompletedNotifications(); + }, + + /** + * Restore multiple windows using the provided state. + * @param aWindow + * Window reference to the first window to use for restoration. + * Additionally required windows will be opened. + * @param aState + * JS object or JSON string + * @param aOptions + * {overwriteTabs: true} to overwrite existing tabs w/ new ones + * {isFollowUp: true} if this is not the restoration of the 1st window + * {firstWindow: true} if this is the first non-private window we're + * restoring in this session, that might open an + * external link as well + */ + restoreWindows: function ssi_restoreWindows(aWindow, aState, aOptions = {}) { + let isFollowUp = aOptions && aOptions.isFollowUp; + + if (isFollowUp) { + this.windowToFocus = aWindow; + } + + // initialize window if necessary + if (aWindow && (!aWindow.__SSi || !this._windows[aWindow.__SSi])) + this.onLoad(aWindow); + + let root; + try { + root = (typeof aState == "string") ? JSON.parse(aState) : aState; + } + catch (ex) { // invalid state object - don't restore anything + debug(ex); + this._sendRestoreCompletedNotifications(); + return; + } + + // Restore closed windows if any. + if (root._closedWindows) { + this._closedWindows = root._closedWindows; + } + + // We're done here if there are no windows. + if (!root.windows || !root.windows.length) { + this._sendRestoreCompletedNotifications(); + return; + } + + if (!root.selectedWindow || root.selectedWindow > root.windows.length) { + root.selectedWindow = 0; + } + + // open new windows for all further window entries of a multi-window session + // (unless they don't contain any tab data) + let winData; + for (var w = 1; w < root.windows.length; w++) { + winData = root.windows[w]; + if (winData && winData.tabs && winData.tabs[0]) { + var window = this._openWindowWithState({ windows: [winData] }); + if (w == root.selectedWindow - 1) { + this.windowToFocus = window; + } + } + } + + this.restoreWindow(aWindow, root.windows[0], aOptions); + + if (aState.scratchpads) { + ScratchpadManager.restoreSession(aState.scratchpads); + } + }, + + /** + * Manage history restoration for a window + * @param aWindow + * Window to restore the tabs into + * @param aTabs + * Array of tab references + * @param aTabData + * Array of tab data + * @param aSelectTab + * Index of the tab to select. This is a 1-based index where "1" + * indicates the first tab should be selected, and "0" indicates that + * the currently selected tab will not be changed. + */ + restoreTabs(aWindow, aTabs, aTabData, aSelectTab) { + var tabbrowser = aWindow.gBrowser; + + if (!this._isWindowLoaded(aWindow)) { + // from now on, the data will come from the actual window + delete this._statesToRestore[aWindow.__SS_restoreID]; + delete aWindow.__SS_restoreID; + delete this._windows[aWindow.__SSi]._restoring; + } + + let numTabsToRestore = aTabs.length; + let numTabsInWindow = tabbrowser.tabs.length; + let tabsDataArray = this._windows[aWindow.__SSi].tabs; + + // Update the window state in case we shut down without being notified. + // Individual tab states will be taken care of by restoreTab() below. + if (numTabsInWindow == numTabsToRestore) { + // Remove all previous tab data. + tabsDataArray.length = 0; + } else { + // Remove all previous tab data except tabs that should not be overriden. + tabsDataArray.splice(numTabsInWindow - numTabsToRestore); + } + + // Let the tab data array have the right number of slots. + tabsDataArray.length = numTabsInWindow; + + // If provided, set the selected tab. + if (aSelectTab > 0 && aSelectTab <= aTabs.length) { + tabbrowser.selectedTab = aTabs[aSelectTab - 1]; + + // Update the window state in case we shut down without being notified. + this._windows[aWindow.__SSi].selected = aSelectTab; + } + + // Restore all tabs. + for (let t = 0; t < aTabs.length; t++) { + this.restoreTab(aTabs[t], aTabData[t]); + } + }, + + // Restores the given tab state for a given tab. + restoreTab(tab, tabData, options = {}) { + NS_ASSERT(!tab.linkedBrowser.__SS_restoreState, + "must reset tab before calling restoreTab()"); + + let restoreImmediately = options.restoreImmediately; + let loadArguments = options.loadArguments; + let browser = tab.linkedBrowser; + let window = tab.ownerGlobal; + let tabbrowser = window.gBrowser; + let forceOnDemand = options.forceOnDemand; + let reloadInFreshProcess = options.reloadInFreshProcess; + + let willRestoreImmediately = restoreImmediately || + tabbrowser.selectedBrowser == browser || + loadArguments; + + if (!willRestoreImmediately && !forceOnDemand) { + TabRestoreQueue.add(tab); + } + + this._maybeUpdateBrowserRemoteness({ tabbrowser, tab, + willRestoreImmediately }); + + // Increase the busy state counter before modifying the tab. + this._setWindowStateBusy(window); + + // It's important to set the window state to dirty so that + // we collect their data for the first time when saving state. + DirtyWindows.add(window); + + // In case we didn't collect/receive data for any tabs yet we'll have to + // fill the array with at least empty tabData objects until |_tPos| or + // we'll end up with |null| entries. + for (let otherTab of Array.slice(tabbrowser.tabs, 0, tab._tPos)) { + let emptyState = {entries: [], lastAccessed: otherTab.lastAccessed}; + this._windows[window.__SSi].tabs.push(emptyState); + } + + // Update the tab state in case we shut down without being notified. + this._windows[window.__SSi].tabs[tab._tPos] = tabData; + + // Prepare the tab so that it can be properly restored. We'll pin/unpin + // and show/hide tabs as necessary. We'll also attach a copy of the tab's + // data in case we close it before it's been restored. + if (tabData.pinned) { + tabbrowser.pinTab(tab); + } else { + tabbrowser.unpinTab(tab); + } + + if (tabData.hidden) { + tabbrowser.hideTab(tab); + } else { + tabbrowser.showTab(tab); + } + + if (!!tabData.muted != browser.audioMuted) { + tab.toggleMuteAudio(tabData.muteReason); + } + + if (tabData.lastAccessed) { + tab.updateLastAccessed(tabData.lastAccessed); + } + + if ("attributes" in tabData) { + // Ensure that we persist tab attributes restored from previous sessions. + Object.keys(tabData.attributes).forEach(a => TabAttributes.persist(a)); + } + + if (!tabData.entries) { + tabData.entries = []; + } + if (tabData.extData) { + tab.__SS_extdata = Cu.cloneInto(tabData.extData, {}); + } else { + delete tab.__SS_extdata; + } + + // Tab is now open. + delete tabData.closedAt; + + // Ensure the index is in bounds. + let activeIndex = (tabData.index || tabData.entries.length) - 1; + activeIndex = Math.min(activeIndex, tabData.entries.length - 1); + activeIndex = Math.max(activeIndex, 0); + + // Save the index in case we updated it above. + tabData.index = activeIndex + 1; + + // Start a new epoch to discard all frame script messages relating to a + // previous epoch. All async messages that are still on their way to chrome + // will be ignored and don't override any tab data set when restoring. + let epoch = this.startNextEpoch(browser); + + // keep the data around to prevent dataloss in case + // a tab gets closed before it's been properly restored + browser.__SS_restoreState = TAB_STATE_NEEDS_RESTORE; + browser.setAttribute("pending", "true"); + tab.setAttribute("pending", "true"); + + // If we're restoring this tab, it certainly shouldn't be in + // the ignored set anymore. + this._crashedBrowsers.delete(browser.permanentKey); + + // Update the persistent tab state cache with |tabData| information. + TabStateCache.update(browser, { + history: {entries: tabData.entries, index: tabData.index}, + scroll: tabData.scroll || null, + storage: tabData.storage || null, + formdata: tabData.formdata || null, + disallow: tabData.disallow || null, + pageStyle: tabData.pageStyle || null, + + // This information is only needed until the tab has finished restoring. + // When that's done it will be removed from the cache and we always + // collect it in TabState._collectBaseTabData(). + image: tabData.image || "", + iconLoadingPrincipal: tabData.iconLoadingPrincipal || null, + userTypedValue: tabData.userTypedValue || "", + userTypedClear: tabData.userTypedClear || 0 + }); + + browser.messageManager.sendAsyncMessage("SessionStore:restoreHistory", + {tabData: tabData, epoch: epoch, loadArguments}); + + // Restore tab attributes. + if ("attributes" in tabData) { + TabAttributes.set(tab, tabData.attributes); + } + + // This could cause us to ignore MAX_CONCURRENT_TAB_RESTORES a bit, but + // it ensures each window will have its selected tab loaded. + if (willRestoreImmediately) { + this.restoreTabContent(tab, loadArguments, reloadInFreshProcess); + } else if (!forceOnDemand) { + this.restoreNextTab(); + } + + // Decrease the busy state counter after we're done. + this._setWindowStateReady(window); + }, + + /** + * Kicks off restoring the given tab. + * + * @param aTab + * the tab to restore + * @param aLoadArguments + * optional load arguments used for loadURI() + * @param aReloadInFreshProcess + * true if we want to reload into a fresh process + */ + restoreTabContent: function (aTab, aLoadArguments = null, aReloadInFreshProcess = false) { + if (aTab.hasAttribute("customizemode") && !aLoadArguments) { + return; + } + + let browser = aTab.linkedBrowser; + let window = aTab.ownerGlobal; + let tabbrowser = window.gBrowser; + let tabData = TabState.clone(aTab); + let activeIndex = tabData.index - 1; + let activePageData = tabData.entries[activeIndex] || null; + let uri = activePageData ? activePageData.url || null : null; + if (aLoadArguments) { + uri = aLoadArguments.uri; + if (aLoadArguments.userContextId) { + browser.setAttribute("usercontextid", aLoadArguments.userContextId); + } + } + + // We have to mark this tab as restoring first, otherwise + // the "pending" attribute will be applied to the linked + // browser, which removes it from the display list. We cannot + // flip the remoteness of any browser that is not being displayed. + this.markTabAsRestoring(aTab); + + let isRemotenessUpdate = false; + if (aReloadInFreshProcess) { + isRemotenessUpdate = tabbrowser.switchBrowserIntoFreshProcess(browser); + } else { + isRemotenessUpdate = tabbrowser.updateBrowserRemotenessByURL(browser, uri); + } + + if (isRemotenessUpdate) { + // We updated the remoteness, so we need to send the history down again. + // + // Start a new epoch to discard all frame script messages relating to a + // previous epoch. All async messages that are still on their way to chrome + // will be ignored and don't override any tab data set when restoring. + let epoch = this.startNextEpoch(browser); + + browser.messageManager.sendAsyncMessage("SessionStore:restoreHistory", { + tabData: tabData, + epoch: epoch, + loadArguments: aLoadArguments, + isRemotenessUpdate, + }); + + } + + // If the restored browser wants to show view source content, start up a + // view source browser that will load the required frame script. + if (uri && ViewSourceBrowser.isViewSource(uri)) { + new ViewSourceBrowser(browser); + } + + browser.messageManager.sendAsyncMessage("SessionStore:restoreTabContent", + {loadArguments: aLoadArguments, isRemotenessUpdate}); + }, + + /** + * Marks a given pending tab as restoring. + * + * @param aTab + * the pending tab to mark as restoring + */ + markTabAsRestoring(aTab) { + let browser = aTab.linkedBrowser; + if (browser.__SS_restoreState != TAB_STATE_NEEDS_RESTORE) { + throw new Error("Given tab is not pending."); + } + + // Make sure that this tab is removed from the priority queue. + TabRestoreQueue.remove(aTab); + + // Increase our internal count. + this._tabsRestoringCount++; + + // Set this tab's state to restoring + browser.__SS_restoreState = TAB_STATE_RESTORING; + browser.removeAttribute("pending"); + aTab.removeAttribute("pending"); + }, + + /** + * This _attempts_ to restore the next available tab. If the restore fails, + * then we will attempt the next one. + * There are conditions where this won't do anything: + * if we're in the process of quitting + * if there are no tabs to restore + * if we have already reached the limit for number of tabs to restore + */ + restoreNextTab: function ssi_restoreNextTab() { + // If we call in here while quitting, we don't actually want to do anything + if (RunState.isQuitting) + return; + + // Don't exceed the maximum number of concurrent tab restores. + if (this._tabsRestoringCount >= MAX_CONCURRENT_TAB_RESTORES) + return; + + let tab = TabRestoreQueue.shift(); + if (tab) { + this.restoreTabContent(tab); + } + }, + + /** + * Restore visibility and dimension features to a window + * @param aWindow + * Window reference + * @param aWinData + * Object containing session data for the window + */ + restoreWindowFeatures: function ssi_restoreWindowFeatures(aWindow, aWinData) { + var hidden = (aWinData.hidden)?aWinData.hidden.split(","):[]; + WINDOW_HIDEABLE_FEATURES.forEach(function(aItem) { + aWindow[aItem].visible = hidden.indexOf(aItem) == -1; + }); + + if (aWinData.isPopup) { + this._windows[aWindow.__SSi].isPopup = true; + if (aWindow.gURLBar) { + aWindow.gURLBar.readOnly = true; + aWindow.gURLBar.setAttribute("enablehistory", "false"); + } + } + else { + delete this._windows[aWindow.__SSi].isPopup; + if (aWindow.gURLBar) { + aWindow.gURLBar.readOnly = false; + aWindow.gURLBar.setAttribute("enablehistory", "true"); + } + } + + var _this = this; + aWindow.setTimeout(function() { + _this.restoreDimensions.apply(_this, [aWindow, + +(aWinData.width || 0), + +(aWinData.height || 0), + "screenX" in aWinData ? +aWinData.screenX : NaN, + "screenY" in aWinData ? +aWinData.screenY : NaN, + aWinData.sizemode || "", aWinData.sidebar || ""]); + }, 0); + }, + + /** + * Restore a window's dimensions + * @param aWidth + * Window width + * @param aHeight + * Window height + * @param aLeft + * Window left + * @param aTop + * Window top + * @param aSizeMode + * Window size mode (eg: maximized) + * @param aSidebar + * Sidebar command + */ + restoreDimensions: function ssi_restoreDimensions(aWindow, aWidth, aHeight, aLeft, aTop, aSizeMode, aSidebar) { + var win = aWindow; + var _this = this; + function win_(aName) { return _this._getWindowDimension(win, aName); } + + // find available space on the screen where this window is being placed + let screen = gScreenManager.screenForRect(aLeft, aTop, aWidth, aHeight); + if (screen) { + let screenLeft = {}, screenTop = {}, screenWidth = {}, screenHeight = {}; + screen.GetAvailRectDisplayPix(screenLeft, screenTop, screenWidth, screenHeight); + // screenX/Y are based on the origin of the screen's desktop-pixel coordinate space + let screenLeftCss = screenLeft.value; + let screenTopCss = screenTop.value; + // convert screen's device pixel dimensions to CSS px dimensions + screen.GetAvailRect(screenLeft, screenTop, screenWidth, screenHeight); + let cssToDevScale = screen.defaultCSSScaleFactor; + let screenRightCss = screenLeftCss + screenWidth.value / cssToDevScale; + let screenBottomCss = screenTopCss + screenHeight.value / cssToDevScale; + + // Pull the window within the screen's bounds (allowing a little slop + // for windows that may be deliberately placed with their border off-screen + // as when Win10 "snaps" a window to the left/right edge -- bug 1276516). + // First, ensure the left edge is large enough... + if (aLeft < screenLeftCss - SCREEN_EDGE_SLOP) { + aLeft = screenLeftCss; + } + // Then check the resulting right edge, and reduce it if necessary. + let right = aLeft + aWidth; + if (right > screenRightCss + SCREEN_EDGE_SLOP) { + right = screenRightCss; + // See if we can move the left edge leftwards to maintain width. + if (aLeft > screenLeftCss) { + aLeft = Math.max(right - aWidth, screenLeftCss); + } + } + // Finally, update aWidth to account for the adjusted left and right edges. + aWidth = right - aLeft; + + // And do the same in the vertical dimension. + if (aTop < screenTopCss - SCREEN_EDGE_SLOP) { + aTop = screenTopCss; + } + let bottom = aTop + aHeight; + if (bottom > screenBottomCss + SCREEN_EDGE_SLOP) { + bottom = screenBottomCss; + if (aTop > screenTopCss) { + aTop = Math.max(bottom - aHeight, screenTopCss); + } + } + aHeight = bottom - aTop; + } + + // only modify those aspects which aren't correct yet + if (!isNaN(aLeft) && !isNaN(aTop) && (aLeft != win_("screenX") || aTop != win_("screenY"))) { + aWindow.moveTo(aLeft, aTop); + } + if (aWidth && aHeight && (aWidth != win_("width") || aHeight != win_("height"))) { + // Don't resize the window if it's currently maximized and we would + // maximize it again shortly after. + if (aSizeMode != "maximized" || win_("sizemode") != "maximized") { + aWindow.resizeTo(aWidth, aHeight); + } + } + if (aSizeMode && win_("sizemode") != aSizeMode) + { + switch (aSizeMode) + { + case "maximized": + aWindow.maximize(); + break; + case "minimized": + aWindow.minimize(); + break; + case "normal": + aWindow.restore(); + break; + } + } + var sidebar = aWindow.document.getElementById("sidebar-box"); + if (sidebar.getAttribute("sidebarcommand") != aSidebar) { + aWindow.SidebarUI.show(aSidebar); + } + // since resizing/moving a window brings it to the foreground, + // we might want to re-focus the last focused window + if (this.windowToFocus) { + this.windowToFocus.focus(); + } + }, + + /* ........ Disk Access .............. */ + + /** + * Save the current session state to disk, after a delay. + * + * @param aWindow (optional) + * Will mark the given window as dirty so that we will recollect its + * data before we start writing. + */ + saveStateDelayed: function (aWindow = null) { + if (aWindow) { + DirtyWindows.add(aWindow); + } + + SessionSaver.runDelayed(); + }, + + /* ........ Auxiliary Functions .............. */ + + /** + * Determines whether or not a tab that is being restored needs + * to have its remoteness flipped first. + * + * @param (object) with the following properties: + * + * tabbrowser (<xul:tabbrowser>): + * The tabbrowser that the browser belongs to. + * + * tab (<xul:tab>): + * The tab being restored + * + * willRestoreImmediately (bool): + * true if the tab is going to have its content + * restored immediately by the caller. + * + */ + _maybeUpdateBrowserRemoteness({ tabbrowser, tab, + willRestoreImmediately }) { + // If the browser we're attempting to restore happens to be + // remote, we need to flip it back to non-remote if it's going + // to go into the pending background tab state. This is to make + // sure that a background tab can't crash if it hasn't yet + // been restored. + // + // Normally, when a window is restored, the tabs that SessionStore + // inserts are non-remote - but the initial browser is, by default, + // remote, so this check and flip covers this case. The other case + // is when window state is overwriting the state of an existing + // window with some remote tabs. + let browser = tab.linkedBrowser; + + // There are two ways that a tab might start restoring its content + // very soon - either the caller is going to restore the content + // immediately, or the TabRestoreQueue is set up so that the tab + // content is going to be restored in the very near future. In + // either case, we don't want to flip remoteness, since the browser + // will soon be loading content. + let willRestore = willRestoreImmediately || + TabRestoreQueue.willRestoreSoon(tab); + + if (browser.isRemoteBrowser && !willRestore) { + tabbrowser.updateBrowserRemoteness(browser, false); + } + }, + + /** + * Update the session start time and send a telemetry measurement + * for the number of days elapsed since the session was started. + * + * @param state + * The session state. + */ + _updateSessionStartTime: function ssi_updateSessionStartTime(state) { + // Attempt to load the session start time from the session state + if (state.session && state.session.startTime) { + this._sessionStartTime = state.session.startTime; + } + }, + + /** + * call a callback for all currently opened browser windows + * (might miss the most recent one) + * @param aFunc + * Callback each window is passed to + */ + _forEachBrowserWindow: function ssi_forEachBrowserWindow(aFunc) { + var windowsEnum = Services.wm.getEnumerator("navigator:browser"); + + while (windowsEnum.hasMoreElements()) { + var window = windowsEnum.getNext(); + if (window.__SSi && !window.closed) { + aFunc.call(this, window); + } + } + }, + + /** + * Returns most recent window + * @returns Window reference + */ + _getMostRecentBrowserWindow: function ssi_getMostRecentBrowserWindow() { + return RecentWindow.getMostRecentBrowserWindow({ allowPopups: true }); + }, + + /** + * Calls onClose for windows that are determined to be closed but aren't + * destroyed yet, which would otherwise cause getBrowserState and + * setBrowserState to treat them as open windows. + */ + _handleClosedWindows: function ssi_handleClosedWindows() { + var windowsEnum = Services.wm.getEnumerator("navigator:browser"); + + while (windowsEnum.hasMoreElements()) { + var window = windowsEnum.getNext(); + if (window.closed) { + this.onClose(window); + } + } + }, + + /** + * open a new browser window for a given session state + * called when restoring a multi-window session + * @param aState + * Object containing session data + */ + _openWindowWithState: function ssi_openWindowWithState(aState) { + var argString = Cc["@mozilla.org/supports-string;1"]. + createInstance(Ci.nsISupportsString); + argString.data = ""; + + // Build feature string + let features = "chrome,dialog=no,macsuppressanimation,all"; + let winState = aState.windows[0]; + WINDOW_ATTRIBUTES.forEach(function(aFeature) { + // Use !isNaN as an easy way to ignore sizemode and check for numbers + if (aFeature in winState && !isNaN(winState[aFeature])) + features += "," + aFeature + "=" + winState[aFeature]; + }); + + if (winState.isPrivate) { + features += ",private"; + } + + var window = + Services.ww.openWindow(null, this._prefBranch.getCharPref("chromeURL"), + "_blank", features, argString); + + do { + var ID = "window" + Math.random(); + } while (ID in this._statesToRestore); + this._statesToRestore[(window.__SS_restoreID = ID)] = aState; + + return window; + }, + + /** + * Whether or not to resume session, if not recovering from a crash. + * @returns bool + */ + _doResumeSession: function ssi_doResumeSession() { + return this._prefBranch.getIntPref("startup.page") == 3 || + this._prefBranch.getBoolPref("sessionstore.resume_session_once"); + }, + + /** + * whether the user wants to load any other page at startup + * (except the homepage) - needed for determining whether to overwrite the current tabs + * C.f.: nsBrowserContentHandler's defaultArgs implementation. + * @returns bool + */ + _isCmdLineEmpty: function ssi_isCmdLineEmpty(aWindow, aState) { + var pinnedOnly = aState.windows && + aState.windows.every(win => + win.tabs.every(tab => tab.pinned)); + + let hasFirstArgument = aWindow.arguments && aWindow.arguments[0]; + if (!pinnedOnly) { + let defaultArgs = Cc["@mozilla.org/browser/clh;1"]. + getService(Ci.nsIBrowserHandler).defaultArgs; + if (aWindow.arguments && + aWindow.arguments[0] && + aWindow.arguments[0] == defaultArgs) + hasFirstArgument = false; + } + + return !hasFirstArgument; + }, + + /** + * on popup windows, the XULWindow's attributes seem not to be set correctly + * we use thus JSDOMWindow attributes for sizemode and normal window attributes + * (and hope for reasonable values when maximized/minimized - since then + * outerWidth/outerHeight aren't the dimensions of the restored window) + * @param aWindow + * Window reference + * @param aAttribute + * String sizemode | width | height | other window attribute + * @returns string + */ + _getWindowDimension: function ssi_getWindowDimension(aWindow, aAttribute) { + if (aAttribute == "sizemode") { + switch (aWindow.windowState) { + case aWindow.STATE_FULLSCREEN: + case aWindow.STATE_MAXIMIZED: + return "maximized"; + case aWindow.STATE_MINIMIZED: + return "minimized"; + default: + return "normal"; + } + } + + var dimension; + switch (aAttribute) { + case "width": + dimension = aWindow.outerWidth; + break; + case "height": + dimension = aWindow.outerHeight; + break; + default: + dimension = aAttribute in aWindow ? aWindow[aAttribute] : ""; + break; + } + + if (aWindow.windowState == aWindow.STATE_NORMAL) { + return dimension; + } + return aWindow.document.documentElement.getAttribute(aAttribute) || dimension; + }, + + /** + * @param aState is a session state + * @param aRecentCrashes is the number of consecutive crashes + * @returns whether a restore page will be needed for the session state + */ + _needsRestorePage: function ssi_needsRestorePage(aState, aRecentCrashes) { + const SIX_HOURS_IN_MS = 6 * 60 * 60 * 1000; + + // don't display the page when there's nothing to restore + let winData = aState.windows || null; + if (!winData || winData.length == 0) + return false; + + // don't wrap a single about:sessionrestore page + if (this._hasSingleTabWithURL(winData, "about:sessionrestore") || + this._hasSingleTabWithURL(winData, "about:welcomeback")) { + return false; + } + + // don't automatically restore in Safe Mode + if (Services.appinfo.inSafeMode) + return true; + + let max_resumed_crashes = + this._prefBranch.getIntPref("sessionstore.max_resumed_crashes"); + let sessionAge = aState.session && aState.session.lastUpdate && + (Date.now() - aState.session.lastUpdate); + + return max_resumed_crashes != -1 && + (aRecentCrashes > max_resumed_crashes || + sessionAge && sessionAge >= SIX_HOURS_IN_MS); + }, + + /** + * @param aWinData is the set of windows in session state + * @param aURL is the single URL we're looking for + * @returns whether the window data contains only the single URL passed + */ + _hasSingleTabWithURL: function(aWinData, aURL) { + if (aWinData && + aWinData.length == 1 && + aWinData[0].tabs && + aWinData[0].tabs.length == 1 && + aWinData[0].tabs[0].entries && + aWinData[0].tabs[0].entries.length == 1) { + return aURL == aWinData[0].tabs[0].entries[0].url; + } + return false; + }, + + /** + * Determine if the tab state we're passed is something we should save. This + * is used when closing a tab or closing a window with a single tab + * + * @param aTabState + * The current tab state + * @returns boolean + */ + _shouldSaveTabState: function ssi_shouldSaveTabState(aTabState) { + // If the tab has only a transient about: history entry, no other + // session history, and no userTypedValue, then we don't actually want to + // store this tab's data. + return aTabState.entries.length && + !(aTabState.entries.length == 1 && + (aTabState.entries[0].url == "about:blank" || + aTabState.entries[0].url == "about:newtab" || + aTabState.entries[0].url == "about:privatebrowsing") && + !aTabState.userTypedValue); + }, + + /** + * This is going to take a state as provided at startup (via + * nsISessionStartup.state) and split it into 2 parts. The first part + * (defaultState) will be a state that should still be restored at startup, + * while the second part (state) is a state that should be saved for later. + * defaultState will be comprised of windows with only pinned tabs, extracted + * from state. It will contain the cookies that go along with the history + * entries in those tabs. It will also contain window position information. + * + * defaultState will be restored at startup. state will be passed into + * LastSession and will be kept in case the user explicitly wants + * to restore the previous session (publicly exposed as restoreLastSession). + * + * @param state + * The state, presumably from nsISessionStartup.state + * @returns [defaultState, state] + */ + _prepDataForDeferredRestore: function ssi_prepDataForDeferredRestore(state) { + // Make sure that we don't modify the global state as provided by + // nsSessionStartup.state. + state = Cu.cloneInto(state, {}); + + let defaultState = { windows: [], selectedWindow: 1 }; + + state.selectedWindow = state.selectedWindow || 1; + + // Look at each window, remove pinned tabs, adjust selectedindex, + // remove window if necessary. + for (let wIndex = 0; wIndex < state.windows.length;) { + let window = state.windows[wIndex]; + window.selected = window.selected || 1; + // We're going to put the state of the window into this object + let pinnedWindowState = { tabs: [], cookies: []}; + for (let tIndex = 0; tIndex < window.tabs.length;) { + if (window.tabs[tIndex].pinned) { + // Adjust window.selected + if (tIndex + 1 < window.selected) + window.selected -= 1; + else if (tIndex + 1 == window.selected) + pinnedWindowState.selected = pinnedWindowState.tabs.length + 2; + // + 2 because the tab isn't actually in the array yet + + // Now add the pinned tab to our window + pinnedWindowState.tabs = + pinnedWindowState.tabs.concat(window.tabs.splice(tIndex, 1)); + // We don't want to increment tIndex here. + continue; + } + tIndex++; + } + + // At this point the window in the state object has been modified (or not) + // We want to build the rest of this new window object if we have pinnedTabs. + if (pinnedWindowState.tabs.length) { + // First get the other attributes off the window + WINDOW_ATTRIBUTES.forEach(function(attr) { + if (attr in window) { + pinnedWindowState[attr] = window[attr]; + delete window[attr]; + } + }); + // We're just copying position data into the pinned window. + // Not copying over: + // - _closedTabs + // - extData + // - isPopup + // - hidden + + // Assign a unique ID to correlate the window to be opened with the + // remaining data + window.__lastSessionWindowID = pinnedWindowState.__lastSessionWindowID + = "" + Date.now() + Math.random(); + + // Extract the cookies that belong with each pinned tab + this._splitCookiesFromWindow(window, pinnedWindowState); + + // Actually add this window to our defaultState + defaultState.windows.push(pinnedWindowState); + // Remove the window from the state if it doesn't have any tabs + if (!window.tabs.length) { + if (wIndex + 1 <= state.selectedWindow) + state.selectedWindow -= 1; + else if (wIndex + 1 == state.selectedWindow) + defaultState.selectedIndex = defaultState.windows.length + 1; + + state.windows.splice(wIndex, 1); + // We don't want to increment wIndex here. + continue; + } + + + } + wIndex++; + } + + return [defaultState, state]; + }, + + /** + * Splits out the cookies from aWinState into aTargetWinState based on the + * tabs that are in aTargetWinState. + * This alters the state of aWinState and aTargetWinState. + */ + _splitCookiesFromWindow: + function ssi_splitCookiesFromWindow(aWinState, aTargetWinState) { + if (!aWinState.cookies || !aWinState.cookies.length) + return; + + // Get the hosts for history entries in aTargetWinState + let cookieHosts = SessionCookies.getHostsForWindow(aTargetWinState); + + // By creating a regex we reduce overhead and there is only one loop pass + // through either array (cookieHosts and aWinState.cookies). + let hosts = Object.keys(cookieHosts).join("|").replace(/\./g, "\\."); + // If we don't actually have any hosts, then we don't want to do anything. + if (!hosts.length) + return; + let cookieRegex = new RegExp(".*(" + hosts + ")"); + for (let cIndex = 0; cIndex < aWinState.cookies.length;) { + if (cookieRegex.test(aWinState.cookies[cIndex].host)) { + aTargetWinState.cookies = + aTargetWinState.cookies.concat(aWinState.cookies.splice(cIndex, 1)); + continue; + } + cIndex++; + } + }, + + _sendRestoreCompletedNotifications: function ssi_sendRestoreCompletedNotifications() { + // not all windows restored, yet + if (this._restoreCount > 1) { + this._restoreCount--; + return; + } + + // observers were already notified + if (this._restoreCount == -1) + return; + + // This was the last window restored at startup, notify observers. + Services.obs.notifyObservers(null, + this._browserSetState ? NOTIFY_BROWSER_STATE_RESTORED : NOTIFY_WINDOWS_RESTORED, + ""); + + this._browserSetState = false; + this._restoreCount = -1; + }, + + /** + * Set the given window's busy state + * @param aWindow the window + * @param aValue the window's busy state + */ + _setWindowStateBusyValue: + function ssi_changeWindowStateBusyValue(aWindow, aValue) { + + this._windows[aWindow.__SSi].busy = aValue; + + // Keep the to-be-restored state in sync because that is returned by + // getWindowState() as long as the window isn't loaded, yet. + if (!this._isWindowLoaded(aWindow)) { + let stateToRestore = this._statesToRestore[aWindow.__SS_restoreID].windows[0]; + stateToRestore.busy = aValue; + } + }, + + /** + * Set the given window's state to 'not busy'. + * @param aWindow the window + */ + _setWindowStateReady: function ssi_setWindowStateReady(aWindow) { + let newCount = (this._windowBusyStates.get(aWindow) || 0) - 1; + if (newCount < 0) { + throw new Error("Invalid window busy state (less than zero)."); + } + this._windowBusyStates.set(aWindow, newCount); + + if (newCount == 0) { + this._setWindowStateBusyValue(aWindow, false); + this._sendWindowStateEvent(aWindow, "Ready"); + } + }, + + /** + * Set the given window's state to 'busy'. + * @param aWindow the window + */ + _setWindowStateBusy: function ssi_setWindowStateBusy(aWindow) { + let newCount = (this._windowBusyStates.get(aWindow) || 0) + 1; + this._windowBusyStates.set(aWindow, newCount); + + if (newCount == 1) { + this._setWindowStateBusyValue(aWindow, true); + this._sendWindowStateEvent(aWindow, "Busy"); + } + }, + + /** + * Dispatch an SSWindowState_____ event for the given window. + * @param aWindow the window + * @param aType the type of event, SSWindowState will be prepended to this string + */ + _sendWindowStateEvent: function ssi_sendWindowStateEvent(aWindow, aType) { + let event = aWindow.document.createEvent("Events"); + event.initEvent("SSWindowState" + aType, true, false); + aWindow.dispatchEvent(event); + }, + + /** + * Dispatch the SSWindowRestored event for the given window. + * @param aWindow + * The window which has been restored + */ + _sendWindowRestoredNotification(aWindow) { + let event = aWindow.document.createEvent("Events"); + event.initEvent("SSWindowRestored", true, false); + aWindow.dispatchEvent(event); + }, + + /** + * Dispatch the SSTabRestored event for the given tab. + * @param aTab + * The tab which has been restored + * @param aIsRemotenessUpdate + * True if this tab was restored due to flip from running from + * out-of-main-process to in-main-process or vice-versa. + */ + _sendTabRestoredNotification(aTab, aIsRemotenessUpdate) { + let event = aTab.ownerDocument.createEvent("CustomEvent"); + event.initCustomEvent("SSTabRestored", true, false, { + isRemotenessUpdate: aIsRemotenessUpdate, + }); + aTab.dispatchEvent(event); + }, + + /** + * @param aWindow + * Window reference + * @returns whether this window's data is still cached in _statesToRestore + * because it's not fully loaded yet + */ + _isWindowLoaded: function ssi_isWindowLoaded(aWindow) { + return !aWindow.__SS_restoreID; + }, + + /** + * Replace "Loading..." with the tab label (with minimal side-effects) + * @param aString is the string the title is stored in + * @param aTabbrowser is a tabbrowser object, containing aTab + * @param aTab is the tab whose title we're updating & using + * + * @returns aString that has been updated with the new title + */ + _replaceLoadingTitle : function ssi_replaceLoadingTitle(aString, aTabbrowser, aTab) { + if (aString == aTabbrowser.mStringBundle.getString("tabs.connecting")) { + aTabbrowser.setTabTitle(aTab); + [aString, aTab.label] = [aTab.label, aString]; + } + return aString; + }, + + /** + * Resize this._closedWindows to the value of the pref, except in the case + * where we don't have any non-popup windows on Windows and Linux. Then we must + * resize such that we have at least one non-popup window. + */ + _capClosedWindows : function ssi_capClosedWindows() { + if (this._closedWindows.length <= this._max_windows_undo) + return; + let spliceTo = this._max_windows_undo; + if (AppConstants.platform != "macosx") { + let normalWindowIndex = 0; + // try to find a non-popup window in this._closedWindows + while (normalWindowIndex < this._closedWindows.length && + !!this._closedWindows[normalWindowIndex].isPopup) + normalWindowIndex++; + if (normalWindowIndex >= this._max_windows_undo) + spliceTo = normalWindowIndex + 1; + } + this._closedWindows.splice(spliceTo, this._closedWindows.length); + }, + + /** + * Clears the set of windows that are "resurrected" before writing to disk to + * make closing windows one after the other until shutdown work as expected. + * + * This function should only be called when we are sure that there has been + * a user action that indicates the browser is actively being used and all + * windows that have been closed before are not part of a series of closing + * windows. + */ + _clearRestoringWindows: function ssi_clearRestoringWindows() { + for (let i = 0; i < this._closedWindows.length; i++) { + delete this._closedWindows[i]._shouldRestore; + } + }, + + /** + * Reset state to prepare for a new session state to be restored. + */ + _resetRestoringState: function ssi_initRestoringState() { + TabRestoreQueue.reset(); + this._tabsRestoringCount = 0; + }, + + /** + * Reset the restoring state for a particular tab. This will be called when + * removing a tab or when a tab needs to be reset (it's being overwritten). + * + * @param aTab + * The tab that will be "reset" + */ + _resetLocalTabRestoringState: function (aTab) { + NS_ASSERT(aTab.linkedBrowser.__SS_restoreState, + "given tab is not restoring"); + + let browser = aTab.linkedBrowser; + + // Keep the tab's previous state for later in this method + let previousState = browser.__SS_restoreState; + + // The browser is no longer in any sort of restoring state. + delete browser.__SS_restoreState; + + aTab.removeAttribute("pending"); + browser.removeAttribute("pending"); + + if (previousState == TAB_STATE_RESTORING) { + if (this._tabsRestoringCount) + this._tabsRestoringCount--; + } else if (previousState == TAB_STATE_NEEDS_RESTORE) { + // Make sure that the tab is removed from the list of tabs to restore. + // Again, this is normally done in restoreTabContent, but that isn't being called + // for this tab. + TabRestoreQueue.remove(aTab); + } + }, + + _resetTabRestoringState: function (tab) { + NS_ASSERT(tab.linkedBrowser.__SS_restoreState, + "given tab is not restoring"); + + let browser = tab.linkedBrowser; + browser.messageManager.sendAsyncMessage("SessionStore:resetRestore", {}); + this._resetLocalTabRestoringState(tab); + }, + + /** + * Each fresh tab starts out with epoch=0. This function can be used to + * start a next epoch by incrementing the current value. It will enables us + * to ignore stale messages sent from previous epochs. The function returns + * the new epoch ID for the given |browser|. + */ + startNextEpoch(browser) { + let next = this.getCurrentEpoch(browser) + 1; + this._browserEpochs.set(browser.permanentKey, next); + return next; + }, + + /** + * Returns the current epoch for the given <browser>. If we haven't assigned + * a new epoch this will default to zero for new tabs. + */ + getCurrentEpoch(browser) { + return this._browserEpochs.get(browser.permanentKey) || 0; + }, + + /** + * Each time a <browser> element is restored, we increment its "epoch". To + * check if a message from content-sessionStore.js is out of date, we can + * compare the epoch received with the message to the <browser> element's + * epoch. This function does that, and returns true if |epoch| is up-to-date + * with respect to |browser|. + */ + isCurrentEpoch: function (browser, epoch) { + return this.getCurrentEpoch(browser) == epoch; + }, + + /** + * Resets the epoch for a given <browser>. We need to this every time we + * receive a hint that a new docShell has been loaded into the browser as + * the frame script starts out with epoch=0. + */ + resetEpoch(browser) { + this._browserEpochs.delete(browser.permanentKey); + }, + + /** + * Handle an error report from a content process. + */ + reportInternalError(data) { + // For the moment, we only report errors through Telemetry. + if (data.telemetry) { + for (let key of Object.keys(data.telemetry)) { + let histogram = Telemetry.getHistogramById(key); + histogram.add(data.telemetry[key]); + } + } + }, + + /** + * Countdown for a given duration, skipping beats if the computer is too busy, + * sleeping or otherwise unavailable. + * + * @param {number} delay An approximate delay to wait in milliseconds (rounded + * up to the closest second). + * + * @return Promise + */ + looseTimer(delay) { + let DELAY_BEAT = 1000; + let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer); + let beats = Math.ceil(delay / DELAY_BEAT); + let promise = new Promise(resolve => { + timer.initWithCallback(function() { + if (beats <= 0) { + resolve(); + } + --beats; + }, DELAY_BEAT, Ci.nsITimer.TYPE_REPEATING_PRECISE_CAN_SKIP); + }); + // Ensure that the timer is both canceled once we are done with it + // and not garbage-collected until then. + promise.then(() => timer.cancel(), () => timer.cancel()); + return promise; + } +}; + +/** + * Priority queue that keeps track of a list of tabs to restore and returns + * the tab we should restore next, based on priority rules. We decide between + * pinned, visible and hidden tabs in that and FIFO order. Hidden tabs are only + * restored with restore_hidden_tabs=true. + */ +var TabRestoreQueue = { + // The separate buckets used to store tabs. + tabs: {priority: [], visible: [], hidden: []}, + + // Preferences used by the TabRestoreQueue to determine which tabs + // are restored automatically and which tabs will be on-demand. + prefs: { + // Lazy getter that returns whether tabs are restored on demand. + get restoreOnDemand() { + let updateValue = () => { + let value = Services.prefs.getBoolPref(PREF); + let definition = {value: value, configurable: true}; + Object.defineProperty(this, "restoreOnDemand", definition); + return value; + } + + const PREF = "browser.sessionstore.restore_on_demand"; + Services.prefs.addObserver(PREF, updateValue, false); + return updateValue(); + }, + + // Lazy getter that returns whether pinned tabs are restored on demand. + get restorePinnedTabsOnDemand() { + let updateValue = () => { + let value = Services.prefs.getBoolPref(PREF); + let definition = {value: value, configurable: true}; + Object.defineProperty(this, "restorePinnedTabsOnDemand", definition); + return value; + } + + const PREF = "browser.sessionstore.restore_pinned_tabs_on_demand"; + Services.prefs.addObserver(PREF, updateValue, false); + return updateValue(); + }, + + // Lazy getter that returns whether we should restore hidden tabs. + get restoreHiddenTabs() { + let updateValue = () => { + let value = Services.prefs.getBoolPref(PREF); + let definition = {value: value, configurable: true}; + Object.defineProperty(this, "restoreHiddenTabs", definition); + return value; + } + + const PREF = "browser.sessionstore.restore_hidden_tabs"; + Services.prefs.addObserver(PREF, updateValue, false); + return updateValue(); + } + }, + + // Resets the queue and removes all tabs. + reset: function () { + this.tabs = {priority: [], visible: [], hidden: []}; + }, + + // Adds a tab to the queue and determines its priority bucket. + add: function (tab) { + let {priority, hidden, visible} = this.tabs; + + if (tab.pinned) { + priority.push(tab); + } else if (tab.hidden) { + hidden.push(tab); + } else { + visible.push(tab); + } + }, + + // Removes a given tab from the queue, if it's in there. + remove: function (tab) { + let {priority, hidden, visible} = this.tabs; + + // We'll always check priority first since we don't + // have an indicator if a tab will be there or not. + let set = priority; + let index = set.indexOf(tab); + + if (index == -1) { + set = tab.hidden ? hidden : visible; + index = set.indexOf(tab); + } + + if (index > -1) { + set.splice(index, 1); + } + }, + + // Returns and removes the tab with the highest priority. + shift: function () { + let set; + let {priority, hidden, visible} = this.tabs; + + let {restoreOnDemand, restorePinnedTabsOnDemand} = this.prefs; + let restorePinned = !(restoreOnDemand && restorePinnedTabsOnDemand); + if (restorePinned && priority.length) { + set = priority; + } else if (!restoreOnDemand) { + if (visible.length) { + set = visible; + } else if (this.prefs.restoreHiddenTabs && hidden.length) { + set = hidden; + } + } + + return set && set.shift(); + }, + + // Moves a given tab from the 'hidden' to the 'visible' bucket. + hiddenToVisible: function (tab) { + let {hidden, visible} = this.tabs; + let index = hidden.indexOf(tab); + + if (index > -1) { + hidden.splice(index, 1); + visible.push(tab); + } + }, + + // Moves a given tab from the 'visible' to the 'hidden' bucket. + visibleToHidden: function (tab) { + let {visible, hidden} = this.tabs; + let index = visible.indexOf(tab); + + if (index > -1) { + visible.splice(index, 1); + hidden.push(tab); + } + }, + + /** + * Returns true if the passed tab is in one of the sets that we're + * restoring content in automatically. + * + * @param tab (<xul:tab>) + * The tab to check + * @returns bool + */ + willRestoreSoon: function (tab) { + let { priority, hidden, visible } = this.tabs; + let { restoreOnDemand, restorePinnedTabsOnDemand, + restoreHiddenTabs } = this.prefs; + let restorePinned = !(restoreOnDemand && restorePinnedTabsOnDemand); + let candidateSet = []; + + if (restorePinned && priority.length) + candidateSet.push(...priority); + + if (!restoreOnDemand) { + if (visible.length) + candidateSet.push(...visible); + + if (restoreHiddenTabs && hidden.length) + candidateSet.push(...hidden); + } + + return candidateSet.indexOf(tab) > -1; + }, +}; + +// A map storing a closed window's state data until it goes aways (is GC'ed). +// This ensures that API clients can still read (but not write) states of +// windows they still hold a reference to but we don't. +var DyingWindowCache = { + _data: new WeakMap(), + + has: function (window) { + return this._data.has(window); + }, + + get: function (window) { + return this._data.get(window); + }, + + set: function (window, data) { + this._data.set(window, data); + }, + + remove: function (window) { + this._data.delete(window); + } +}; + +// A weak set of dirty windows. We use it to determine which windows we need to +// recollect data for when getCurrentState() is called. +var DirtyWindows = { + _data: new WeakMap(), + + has: function (window) { + return this._data.has(window); + }, + + add: function (window) { + return this._data.set(window, true); + }, + + remove: function (window) { + this._data.delete(window); + }, + + clear: function (window) { + this._data = new WeakMap(); + } +}; + +// The state from the previous session (after restoring pinned tabs). This +// state is persisted and passed through to the next session during an app +// restart to make the third party add-on warning not trash the deferred +// session +var LastSession = { + _state: null, + + get canRestore() { + return !!this._state; + }, + + getState: function () { + return this._state; + }, + + setState: function (state) { + this._state = state; + }, + + clear: function () { + if (this._state) { + this._state = null; + Services.obs.notifyObservers(null, NOTIFY_LAST_SESSION_CLEARED, null); + } + } +}; |