c2c876bd2a
Backed out changeset a809b45ff49b (bug 1478308) Backed out changeset c68131530742 (bug 1478308) Backed out changeset 0e4ba7a6dc1a (bug 1478308) Backed out changeset 32a27f317a77 (bug 1478308)
258 lines
8.9 KiB
JavaScript
258 lines
8.9 KiB
JavaScript
/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set sts=2 sw=2 et tw=80: */
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/* 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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var EXPORTED_SYMBOLS = ["LegacyExtensionsUtils"];
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/* exported LegacyExtensionsUtils, LegacyExtensionContext */
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/**
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* This file exports helpers for Legacy Extensions that want to embed a webextensions
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* and exchange messages with the embedded WebExtension.
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*/
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ChromeUtils.defineModuleGetter(this, "Extension",
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"resource://gre/modules/Extension.jsm");
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ChromeUtils.defineModuleGetter(this, "ExtensionChild",
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"resource://gre/modules/ExtensionChild.jsm");
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ChromeUtils.defineModuleGetter(this, "Services",
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"resource://gre/modules/Services.jsm");
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ChromeUtils.import("resource://gre/modules/ExtensionCommon.jsm");
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var {
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BaseContext,
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} = ExtensionCommon;
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/**
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* Instances created from this class provide to a legacy extension
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* a simple API to exchange messages with a webextension.
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*/
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var LegacyExtensionContext = class extends BaseContext {
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/**
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* Create a new LegacyExtensionContext given a target Extension instance.
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*
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* @param {Extension} targetExtension
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* The webextension instance associated with this context. This will be the
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* instance of the newly created embedded webextension when this class is
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* used through the EmbeddedWebExtensionsUtils.
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*/
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constructor(targetExtension) {
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super("legacy_extension", targetExtension);
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// Legacy Extensions (xul overlays, bootstrap restartless and Addon SDK)
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// runs with a systemPrincipal.
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let addonPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
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Object.defineProperty(
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this, "principal",
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{value: addonPrincipal, enumerable: true, configurable: true}
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);
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let cloneScope = Cu.Sandbox(this.principal, {});
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Cu.setSandboxMetadata(cloneScope, {addonId: targetExtension.id});
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Object.defineProperty(
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this, "cloneScope",
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{value: cloneScope, enumerable: true, configurable: true, writable: true}
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);
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let sender = {id: targetExtension.id};
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let filter = {extensionId: targetExtension.id};
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// Legacy addons live in the main process. Messages from other addons are
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// Messages from WebExtensions are sent to the main process and forwarded via
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// the parent process manager to the legacy extension.
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this.messenger = new ExtensionChild.Messenger(this, [Services.cpmm], sender, filter);
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this.api = {
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browser: {
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runtime: {
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onConnect: this.messenger.onConnect("runtime.onConnect"),
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onMessage: this.messenger.onMessage("runtime.onMessage"),
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},
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},
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};
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}
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/**
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* This method is called when the extension shuts down or is unloaded,
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* and it nukes the cloneScope sandbox, if any.
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*/
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unload() {
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if (this.unloaded) {
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throw new Error("Error trying to unload LegacyExtensionContext twice.");
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}
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super.unload();
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Cu.nukeSandbox(this.cloneScope);
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this.cloneScope = null;
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}
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};
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var EmbeddedExtensionManager;
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/**
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* Instances of this class are used internally by the exported EmbeddedWebExtensionsUtils
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* to manage the embedded webextension instance and the related LegacyExtensionContext
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* instance used to exchange messages with it.
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*/
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class EmbeddedExtension {
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/**
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* Create a new EmbeddedExtension given the add-on id and the base resource URI of the
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* container add-on (the webextension resources will be loaded from the "webextension/"
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* subdir of the base resource URI for the legacy extension add-on).
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*
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* @param {Object} containerAddonParams
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* An object with the following properties:
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* @param {string} containerAddonParams.id
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* The Add-on id of the Legacy Extension which will contain the embedded webextension.
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* @param {string} containerAddonParams.version
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* The add-on version.
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* @param {nsIURI} containerAddonParams.resourceURI
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* The nsIURI of the Legacy Extension container add-on.
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*/
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constructor({id, resourceURI, version}) {
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this.addonId = id;
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this.resourceURI = resourceURI;
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this.version = version;
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// Setup status flag.
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this.started = false;
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}
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/**
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* Start the embedded webextension.
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*
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* @param {number} reason
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* The add-on startup bootstrap reason received from the XPIProvider.
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* @param {object} [addonData]
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* Additional data to pass to the Extension constructor.
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*
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* @returns {Promise<LegacyContextAPI>} A promise which resolve to the API exposed to the
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* legacy context.
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*/
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startup(reason, addonData = {}) {
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if (this.started) {
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return Promise.reject(new Error("This embedded extension has already been started"));
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}
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// Setup the startup promise.
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this.startupPromise = new Promise((resolve, reject) => {
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let embeddedExtensionURI = Services.io.newURI("webextension/", null, this.resourceURI);
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let {builtIn, signedState, temporarilyInstalled} = addonData;
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// This is the instance of the WebExtension embedded in the hybrid add-on.
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this.extension = new Extension({
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builtIn,
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signedState,
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temporarilyInstalled,
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id: this.addonId,
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resourceURI: embeddedExtensionURI,
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version: this.version,
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});
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this.extension.isEmbedded = true;
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// This callback is register to the "startup" event, emitted by the Extension instance
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// after the extension manifest.json has been loaded without any errors, but before
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// starting any of the defined contexts (which give the legacy part a chance to subscribe
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// runtime.onMessage/onConnect listener before the background page has been loaded).
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const onBeforeStarted = () => {
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this.extension.off("startup", onBeforeStarted);
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// Resolve the startup promise and reset the startupError.
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this.started = true;
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this.startupPromise = null;
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// Create the legacy extension context, the legacy container addon
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// needs to use it before the embedded webextension startup,
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// because it is supposed to be used during the legacy container startup
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// to subscribe its message listeners (which are supposed to be able to
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// receive any message that the embedded part can try to send to it
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// during its startup).
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this.context = new LegacyExtensionContext(this.extension);
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// Destroy the LegacyExtensionContext cloneScope when
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// the embedded webextensions is unloaded.
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this.extension.callOnClose({
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close: () => {
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this.context.unload();
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},
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});
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// resolve startupPromise to execute any pending shutdown that has been
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// chained to it.
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resolve(this.context.api);
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};
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this.extension.on("startup", onBeforeStarted);
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// Run ambedded extension startup and catch any error during embedded extension
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// startup.
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this.extension.startup(reason).catch((err) => {
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this.started = false;
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this.startupPromise = null;
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this.extension.off("startup", onBeforeStarted);
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reject(err);
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});
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});
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return this.startupPromise;
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}
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/**
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* Shuts down the embedded webextension.
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*
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* @param {number} reason
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* The add-on shutdown bootstrap reason received from the XPIProvider.
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*
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* @returns {Promise<void>} a promise that is resolved when the shutdown has been done
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*/
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async shutdown(reason) {
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EmbeddedExtensionManager.untrackEmbeddedExtension(this);
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if (this.extension && !this.extension.hasShutdown) {
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let {extension} = this;
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this.extension = null;
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await extension.shutdown(reason);
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}
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return undefined;
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}
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}
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// Keep track on the created EmbeddedExtension instances and destroy
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// them when their container addon is going to be disabled or uninstalled.
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EmbeddedExtensionManager = {
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// Map of the existent EmbeddedExtensions instances by addon id.
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embeddedExtensionsByAddonId: new Map(),
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untrackEmbeddedExtension(embeddedExtensionInstance) {
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// Remove this instance from the tracked embedded extensions
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let id = embeddedExtensionInstance.addonId;
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if (this.embeddedExtensionsByAddonId.get(id) == embeddedExtensionInstance) {
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this.embeddedExtensionsByAddonId.delete(id);
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}
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},
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getEmbeddedExtensionFor({id, resourceURI, version}) {
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let embeddedExtension = this.embeddedExtensionsByAddonId.get(id);
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if (!embeddedExtension) {
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embeddedExtension = new EmbeddedExtension({id, resourceURI, version});
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// Keep track of the embedded extension instance.
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this.embeddedExtensionsByAddonId.set(id, embeddedExtension);
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}
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return embeddedExtension;
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},
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};
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var LegacyExtensionsUtils = {
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getEmbeddedExtensionFor: (addon) => {
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return EmbeddedExtensionManager.getEmbeddedExtensionFor(addon);
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},
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};
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