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/* 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/. */
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
E10SUtils: "resource://gre/modules/E10SUtils.sys.mjs",
});
var SessionMigrationInternal = {
/**
* Convert the original session restore state into a minimal state. It will
* only contain:
* - open windows
* - with tabs
* - with history entries with only title, url, triggeringPrincipal
* - with pinned state
* - with tab group info (hidden + group id)
* - with selected tab info
* - with selected window info
*
* The complete state is then wrapped into the "about:welcomeback" page as
* form field info to be restored when restoring the state.
*/
convertState(aStateObj) {
let state = {
selectedWindow: aStateObj.selectedWindow,
_closedWindows: [],
};
state.windows = aStateObj.windows.map(function (oldWin) {
var win = { extData: {} };
win.tabs = oldWin.tabs.map(function (oldTab) {
var tab = {};
// Keep only titles, urls and triggeringPrincipals for history entries
tab.entries = oldTab.entries.map(function (entry) {
return {
url: entry.url,
triggeringPrincipal_base64: entry.triggeringPrincipal_base64,
title: entry.title,
};
});
tab.index = oldTab.index;
tab.hidden = oldTab.hidden;
tab.pinned = oldTab.pinned;
return tab;
});
win.selected = oldWin.selected;
win._closedTabs = [];
return win;
});
let url = "about:welcomeback";
let formdata = { id: { sessionData: state }, url };
let entry = {
url,
triggeringPrincipal_base64: lazy.E10SUtils.SERIALIZED_SYSTEMPRINCIPAL,
};
return { windows: [{ tabs: [{ entries: [entry], formdata }] }] };
},
/**
* Asynchronously read session restore state (JSON) from a path
*/
readState(aPath) {
return IOUtils.readJSON(aPath, { decompress: true });
},
/**
* Asynchronously write session restore state as JSON to a path
*/
writeState(aPath, aState) {
return IOUtils.writeJSON(aPath, aState, {
compress: true,
tmpPath: `${aPath}.tmp`,
});
},
};
export var SessionMigration = {
/**
* Migrate a limited set of session data from one path to another.
*/
migrate(aFromPath, aToPath) {
return (async function () {
let inState = await SessionMigrationInternal.readState(aFromPath);
let outState = SessionMigrationInternal.convertState(inState);
// Unfortunately, we can't use SessionStore's own SessionFile to
// write out the data because it has a dependency on the profile dir
// being known. When the migration runs, there is no guarantee that
// that's true.
await SessionMigrationInternal.writeState(aToPath, outState);
})();
},
};
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