forked from mirrors/gecko-dev
b1c3221502
MozReview-Commit-ID: LjsEwnr5I1R --HG-- extra : rebase_source : f0c50f610acb5d4c6ae1c89d3761cc53a1e5c182
105 lines
3.5 KiB
JavaScript
105 lines
3.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["SessionMigration"];
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm", this);
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Cu.import("resource://gre/modules/osfile.jsm", this);
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XPCOMUtils.defineLazyModuleGetter(this, "Utils",
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"resource://gre/modules/sessionstore/Utils.jsm");
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// An encoder to UTF-8.
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XPCOMUtils.defineLazyGetter(this, "gEncoder", function() {
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return new TextEncoder();
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});
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// A decoder.
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XPCOMUtils.defineLazyGetter(this, "gDecoder", function() {
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return new TextDecoder();
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});
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var SessionMigrationInternal = {
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/**
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* Convert the original session restore state into a minimal state. It will
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* only contain:
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* - open windows
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* - with tabs
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* - with history entries with only title, url, triggeringPrincipal
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* - with pinned state
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* - with tab group info (hidden + group id)
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* - with selected tab info
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* - with selected window info
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*
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* The complete state is then wrapped into the "about:welcomeback" page as
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* form field info to be restored when restoring the state.
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*/
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convertState(aStateObj) {
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let state = {
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selectedWindow: aStateObj.selectedWindow,
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_closedWindows: []
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};
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state.windows = aStateObj.windows.map(function(oldWin) {
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var win = {extData: {}};
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win.tabs = oldWin.tabs.map(function(oldTab) {
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var tab = {};
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// Keep only titles, urls and triggeringPrincipals for history entries
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tab.entries = oldTab.entries.map(function(entry) {
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return { url: entry.url,
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triggeringPrincipal_base64: entry.triggeringPrincipal_base64,
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title: entry.title };
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});
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tab.index = oldTab.index;
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tab.hidden = oldTab.hidden;
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tab.pinned = oldTab.pinned;
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return tab;
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});
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win.selected = oldWin.selected;
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win._closedTabs = [];
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return win;
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});
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let url = "about:welcomeback";
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let formdata = {id: {sessionData: state}, url};
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let entry = { url, triggeringPrincipal_base64: Utils.SERIALIZED_SYSTEMPRINCIPAL };
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return { windows: [{ tabs: [{ entries: [ entry ], formdata}]}]};
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},
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/**
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* Asynchronously read session restore state (JSON) from a path
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*/
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readState(aPath) {
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return (async function() {
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let bytes = await OS.File.read(aPath, {compression: "lz4"});
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let text = gDecoder.decode(bytes);
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let state = JSON.parse(text);
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return state;
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})();
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},
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/**
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* Asynchronously write session restore state as JSON to a path
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*/
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writeState(aPath, aState) {
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let bytes = gEncoder.encode(JSON.stringify(aState));
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return OS.File.writeAtomic(aPath, bytes, {tmpPath: aPath + ".tmp", compression: "lz4"});
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}
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}
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var SessionMigration = {
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/**
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* Migrate a limited set of session data from one path to another.
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*/
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migrate(aFromPath, aToPath) {
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return (async function() {
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let inState = await SessionMigrationInternal.readState(aFromPath);
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let outState = SessionMigrationInternal.convertState(inState);
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// Unfortunately, we can't use SessionStore's own SessionFile to
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// write out the data because it has a dependency on the profile dir
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// being known. When the migration runs, there is no guarantee that
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// that's true.
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await SessionMigrationInternal.writeState(aToPath, outState);
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})();
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}
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};
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