diff options
Diffstat (limited to 'tools/addon-sdk-1.12/lib/sdk/content/worker.js')
| -rw-r--r-- | tools/addon-sdk-1.12/lib/sdk/content/worker.js | 582 |
1 files changed, 582 insertions, 0 deletions
diff --git a/tools/addon-sdk-1.12/lib/sdk/content/worker.js b/tools/addon-sdk-1.12/lib/sdk/content/worker.js new file mode 100644 index 0000000..b2f204c --- /dev/null +++ b/tools/addon-sdk-1.12/lib/sdk/content/worker.js @@ -0,0 +1,582 @@ +/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim:set ts=2 sw=2 sts=2 et: */ +/* 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"; + +module.metadata = { + "stability": "unstable" +}; + +const { Trait } = require('../deprecated/traits'); +const { EventEmitter, EventEmitterTrait } = require('../deprecated/events'); +const { Ci, Cu, Cc } = require('chrome'); +const timer = require('../timers'); +const { URL } = require('../url'); +const unload = require('../system/unload'); +const observers = require('../deprecated/observer-service'); +const { Cortex } = require('../deprecated/cortex'); +const { sandbox, evaluate, load } = require("../loader/sandbox"); +const { merge } = require('../util/object'); +const xulApp = require("../system/xul-app"); +const USE_JS_PROXIES = !xulApp.versionInRange(xulApp.platformVersion, + "17.0a2", "*"); +const { getTabForWindow } = require('../tabs/helpers'); + +/* Trick the linker in order to ensure shipping these files in the XPI. + require('./content-proxy.js'); + require('./content-worker.js'); + Then, retrieve URL of these files in the XPI: +*/ +let prefix = module.uri.split('worker.js')[0]; +const CONTENT_PROXY_URL = prefix + 'content-proxy.js'; +const CONTENT_WORKER_URL = prefix + 'content-worker.js'; + +const JS_VERSION = '1.8'; + +const ERR_DESTROYED = + "Couldn't find the worker to receive this message. " + + "The script may not be initialized yet, or may already have been unloaded."; + +const ERR_FROZEN = "The page is currently hidden and can no longer be used " + + "until it is visible again."; + +/** + * This key is not exported and should only be used for proxy tests. + * The following `PRIVATE_KEY` is used in addon module scope in order to tell + * Worker API to expose `UNWRAP_ACCESS_KEY` in content script. + * This key allows test-content-proxy.js to unwrap proxy with valueOf: + * let xpcWrapper = proxyWrapper.valueOf(UNWRAP_ACCESS_KEY); + */ +const PRIVATE_KEY = {}; + + +const WorkerSandbox = EventEmitter.compose({ + + /** + * Emit a message to the worker content sandbox + */ + emit: function emit() { + // First ensure having a regular array + // (otherwise, `arguments` would be mapped to an object by `stringify`) + let array = Array.slice(arguments); + // JSON.stringify is buggy with cross-sandbox values, + // it may return "{}" on functions. Use a replacer to match them correctly. + function replacer(k, v) { + return typeof v === "function" ? undefined : v; + } + // Ensure having an asynchronous behavior + let self = this; + timer.setTimeout(function () { + self._emitToContent(JSON.stringify(array, replacer)); + }, 0); + }, + + /** + * Synchronous version of `emit`. + * /!\ Should only be used when it is strictly mandatory /!\ + * Doesn't ensure passing only JSON values. + * Mainly used by context-menu in order to avoid breaking it. + */ + emitSync: function emitSync() { + let args = Array.slice(arguments); + // Bug 732716: Ensure wrapping xrays sent to the content script + // otherwise it will have access to raw xraywrappers and content script + // will assume it is an user object coming from the content script sandbox + if ("_wrap" in this) + args = args.map(this._wrap); + return this._emitToContent(args); + }, + + /** + * Tells if content script has at least one listener registered for one event, + * through `self.on('xxx', ...)`. + * /!\ Shouldn't be used. Implemented to avoid breaking context-menu API. + */ + hasListenerFor: function hasListenerFor(name) { + return this._hasListenerFor(name); + }, + + /** + * Method called by the worker sandbox when it needs to send a message + */ + _onContentEvent: function onContentEvent(args) { + // As `emit`, we ensure having an asynchronous behavior + let self = this; + timer.setTimeout(function () { + // We emit event to chrome/addon listeners + self._emit.apply(self, JSON.parse(args)); + }, 0); + }, + + /** + * Configures sandbox and loads content scripts into it. + * @param {Worker} worker + * content worker + */ + constructor: function WorkerSandbox(worker) { + this._addonWorker = worker; + + // Ensure that `emit` has always the right `this` + this.emit = this.emit.bind(this); + this.emitSync = this.emitSync.bind(this); + + // We receive a wrapped window, that may be an xraywrapper if it's content + let window = worker._window; + let proto = window; + + // Instantiate trusted code in another Sandbox in order to prevent content + // script from messing with standard classes used by proxy and API code. + let apiSandbox = sandbox(window, { wantXrays: true }); + + // Build content proxies only if the document has a non-system principal + // And only on old firefox versions that doesn't ship bug 738244 + if (USE_JS_PROXIES && XPCNativeWrapper.unwrap(window) !== window) { + apiSandbox.console = console; + // Execute the proxy code + load(apiSandbox, CONTENT_PROXY_URL); + // Get a reference of the window's proxy + proto = apiSandbox.create(window); + // Keep a reference to `wrap` function for `emitSync` usage + this._wrap = apiSandbox.wrap; + } + + // Create the sandbox and bind it to window in order for content scripts to + // have access to all standard globals (window, document, ...) + let content = this._sandbox = sandbox(window, { + sandboxPrototype: proto, + wantXrays: true + }); + // We have to ensure that window.top and window.parent are the exact same + // object than window object, i.e. the sandbox global object. But not + // always, in case of iframes, top and parent are another window object. + let top = window.top === window ? content : content.top; + let parent = window.parent === window ? content : content.parent; + merge(content, { + // We need "this === window === top" to be true in toplevel scope: + get window() content, + get top() top, + get parent() parent, + // Use the Greasemonkey naming convention to provide access to the + // unwrapped window object so the content script can access document + // JavaScript values. + // NOTE: this functionality is experimental and may change or go away + // at any time! + get unsafeWindow() window.wrappedJSObject + }); + + // Load trusted code that will inject content script API. + // We need to expose JS objects defined in same principal in order to + // avoid having any kind of wrapper. + load(apiSandbox, CONTENT_WORKER_URL); + + // prepare a clean `self.options` + let options = 'contentScriptOptions' in worker ? + JSON.stringify( worker.contentScriptOptions ) : + undefined; + + // Then call `inject` method and communicate with this script + // by trading two methods that allow to send events to the other side: + // - `onEvent` called by content script + // - `result.emitToContent` called by addon script + // Bug 758203: We have to explicitely define `__exposedProps__` in order + // to allow access to these chrome object attributes from this sandbox with + // content priviledges + // https://developer.mozilla.org/en/XPConnect_wrappers#Other_security_wrappers + let chromeAPI = { + timers: { + setTimeout: timer.setTimeout, + setInterval: timer.setInterval, + clearTimeout: timer.clearTimeout, + clearInterval: timer.clearInterval, + __exposedProps__: { + setTimeout: 'r', + setInterval: 'r', + clearTimeout: 'r', + clearInterval: 'r' + } + }, + __exposedProps__: { + timers: 'r' + } + }; + let onEvent = this._onContentEvent.bind(this); + // `ContentWorker` is defined in CONTENT_WORKER_URL file + let result = apiSandbox.ContentWorker.inject(content, chromeAPI, onEvent, options); + this._emitToContent = result.emitToContent; + this._hasListenerFor = result.hasListenerFor; + + // Handle messages send by this script: + let self = this; + // console.xxx calls + this.on("console", function consoleListener(kind) { + console[kind].apply(console, Array.slice(arguments, 1)); + }); + + // self.postMessage calls + this.on("message", function postMessage(data) { + // destroyed? + if (self._addonWorker) + self._addonWorker._emit('message', data); + }); + + // self.port.emit calls + this.on("event", function portEmit(name, args) { + // destroyed? + if (self._addonWorker) + self._addonWorker._onContentScriptEvent.apply(self._addonWorker, arguments); + }); + + // Internal feature that is only used by SDK tests: + // Expose unlock key to content script context. + // See `PRIVATE_KEY` definition for more information. + if (apiSandbox && worker._expose_key) + content.UNWRAP_ACCESS_KEY = apiSandbox.UNWRAP_ACCESS_KEY; + + // Inject `addon` global into target document if document is trusted, + // `addon` in document is equivalent to `self` in content script. + if (worker._injectInDocument) { + let win = window.wrappedJSObject ? window.wrappedJSObject : window; + Object.defineProperty(win, "addon", { + value: content.self + } + ); + } + + // The order of `contentScriptFile` and `contentScript` evaluation is + // intentional, so programs can load libraries like jQuery from script URLs + // and use them in scripts. + let contentScriptFile = ('contentScriptFile' in worker) ? worker.contentScriptFile + : null, + contentScript = ('contentScript' in worker) ? worker.contentScript : null; + + if (contentScriptFile) { + if (Array.isArray(contentScriptFile)) + this._importScripts.apply(this, contentScriptFile); + else + this._importScripts(contentScriptFile); + } + if (contentScript) { + this._evaluate( + Array.isArray(contentScript) ? contentScript.join(';\n') : contentScript + ); + } + }, + destroy: function destroy() { + this.emitSync("detach"); + this._sandbox = null; + this._addonWorker = null; + this._wrap = null; + }, + + /** + * JavaScript sandbox where all the content scripts are evaluated. + * {Sandbox} + */ + _sandbox: null, + + /** + * Reference to the addon side of the worker. + * @type {Worker} + */ + _addonWorker: null, + + /** + * Evaluates code in the sandbox. + * @param {String} code + * JavaScript source to evaluate. + * @param {String} [filename='javascript:' + code] + * Name of the file + */ + _evaluate: function(code, filename) { + try { + evaluate(this._sandbox, code, filename || 'javascript:' + code); + } + catch(e) { + this._addonWorker._emit('error', e); + } + }, + /** + * Imports scripts to the sandbox by reading files under urls and + * evaluating its source. If exception occurs during evaluation + * `"error"` event is emitted on the worker. + * This is actually an analog to the `importScript` method in web + * workers but in our case it's not exposed even though content + * scripts may be able to do it synchronously since IO operation + * takes place in the UI process. + */ + _importScripts: function _importScripts(url) { + let urls = Array.slice(arguments, 0); + for each (let contentScriptFile in urls) { + try { + let uri = URL(contentScriptFile); + if (uri.scheme === 'resource') + load(this._sandbox, String(uri)); + else + throw Error("Unsupported `contentScriptFile` url: " + String(uri)); + } + catch(e) { + this._addonWorker._emit('error', e); + } + } + } +}); + +/** + * Message-passing facility for communication between code running + * in the content and add-on process. + * @see https://jetpack.mozillalabs.com/sdk/latest/docs/#module/api-utils/content/worker + */ +const Worker = EventEmitter.compose({ + on: Trait.required, + _removeAllListeners: Trait.required, + + /** + * Sends a message to the worker's global scope. Method takes single + * argument, which represents data to be sent to the worker. The data may + * be any primitive type value or `JSON`. Call of this method asynchronously + * emits `message` event with data value in the global scope of this + * symbiont. + * + * `message` event listeners can be set either by calling + * `self.on` with a first argument string `"message"` or by + * implementing `onMessage` function in the global scope of this worker. + * @param {Number|String|JSON} data + */ + postMessage: function postMessage(data) { + if (!this._contentWorker) + throw new Error(ERR_DESTROYED); + if (this._frozen) + throw new Error(ERR_FROZEN); + + this._contentWorker.emit("message", data); + }, + + /** + * EventEmitter, that behaves (calls listeners) asynchronously. + * A way to send customized messages to / from the worker. + * Events from in the worker can be observed / emitted via + * worker.on / worker.emit. + */ + get port() { + // We generate dynamically this attribute as it needs to be accessible + // before Worker.constructor gets called. (For ex: Panel) + + // create an event emitter that receive and send events from/to the worker + let self = this; + this._port = EventEmitterTrait.create({ + emit: function () self._emitEventToContent(Array.slice(arguments)) + }); + + // expose wrapped port, that exposes only public properties: + // We need to destroy this getter in order to be able to set the + // final value. We need to update only public port attribute as we never + // try to access port attribute from private API. + delete this._public.port; + this._public.port = Cortex(this._port); + // Replicate public port to the private object + delete this.port; + this.port = this._public.port; + + return this._port; + }, + + /** + * Same object than this.port but private API. + * Allow access to _emit, in order to send event to port. + */ + _port: null, + + /** + * Emit a custom event to the content script, + * i.e. emit this event on `self.port` + */ + _emitEventToContent: function _emitEventToContent(args) { + // We need to save events that are emitted before the worker is + // initialized + if (!this._inited) { + this._earlyEvents.push(args); + return; + } + + if (this._frozen) + throw new Error(ERR_FROZEN); + + // We throw exception when the worker has been destroyed + if (!this._contentWorker) { + throw new Error(ERR_DESTROYED); + } + + // Forward the event to the WorkerSandbox object + this._contentWorker.emit.apply(null, ["event"].concat(args)); + }, + + // Is worker connected to the content worker sandbox ? + _inited: false, + + // Is worker being frozen? i.e related document is frozen in bfcache. + // Content script should not be reachable if frozen. + _frozen: true, + + // List of custom events fired before worker is initialized + get _earlyEvents() { + delete this._earlyEvents; + this._earlyEvents = []; + return this._earlyEvents; + }, + + constructor: function Worker(options) { + options = options || {}; + + if ('window' in options) + this._window = options.window; + if ('contentScriptFile' in options) + this.contentScriptFile = options.contentScriptFile; + if ('contentScriptOptions' in options) + this.contentScriptOptions = options.contentScriptOptions; + if ('contentScript' in options) + this.contentScript = options.contentScript; + if ('onError' in options) + this.on('error', options.onError); + if ('onMessage' in options) + this.on('message', options.onMessage); + if ('onDetach' in options) + this.on('detach', options.onDetach); + + // Internal feature that is only used by SDK unit tests. + // See `PRIVATE_KEY` definition for more information. + if ('exposeUnlockKey' in options && options.exposeUnlockKey === PRIVATE_KEY) + this._expose_key = true; + + // Track document unload to destroy this worker. + // We can't watch for unload event on page's window object as it + // prevents bfcache from working: + // https://developer.mozilla.org/En/Working_with_BFCache + this._windowID = this._window. + QueryInterface(Ci.nsIInterfaceRequestor). + getInterface(Ci.nsIDOMWindowUtils). + currentInnerWindowID; + observers.add("inner-window-destroyed", + this._documentUnload = this._documentUnload.bind(this)); + + // Listen to pagehide event in order to freeze the content script + // while the document is frozen in bfcache: + this._window.addEventListener("pageshow", + this._pageShow = this._pageShow.bind(this), + true); + this._window.addEventListener("pagehide", + this._pageHide = this._pageHide.bind(this), + true); + + unload.ensure(this._public, "destroy"); + + // Ensure that worker._port is initialized for contentWorker to be able + // to send use event during WorkerSandbox(this) + this.port; + + // will set this._contentWorker pointing to the private API: + this._contentWorker = WorkerSandbox(this); + + // Mainly enable worker.port.emit to send event to the content worker + this._inited = true; + this._frozen = false; + + // Flush all events that have been fired before the worker is initialized. + this._earlyEvents.forEach((function (args) this._emitEventToContent(args)). + bind(this)); + }, + + _documentUnload: function _documentUnload(subject, topic, data) { + let innerWinID = subject.QueryInterface(Ci.nsISupportsPRUint64).data; + if (innerWinID != this._windowID) return false; + this._workerCleanup(); + return true; + }, + + _pageShow: function _pageShow() { + this._contentWorker.emitSync("pageshow"); + this._emit("pageshow"); + this._frozen = false; + }, + + _pageHide: function _pageHide() { + this._contentWorker.emitSync("pagehide"); + this._emit("pagehide"); + this._frozen = true; + }, + + get url() { + // this._window will be null after detach + return this._window ? this._window.document.location.href : null; + }, + + get tab() { + // this._window will be null after detach + if (this._window) + return getTabForWindow(this._window); + return null; + }, + + /** + * Tells content worker to unload itself and + * removes all the references from itself. + */ + destroy: function destroy() { + this._workerCleanup(); + this._removeAllListeners(); + }, + + /** + * Remove all internal references to the attached document + * Tells _port to unload itself and removes all the references from itself. + */ + _workerCleanup: function _workerCleanup() { + // maybe unloaded before content side is created + // As Symbiont call worker.constructor on document load + if (this._contentWorker) + this._contentWorker.destroy(); + this._contentWorker = null; + if (this._window) { + this._window.removeEventListener("pageshow", this._pageShow, true); + this._window.removeEventListener("pagehide", this._pageHide, true); + } + this._window = null; + // This method may be called multiple times, + // avoid dispatching `detach` event more than once + if (this._windowID) { + this._windowID = null; + observers.remove("inner-window-destroyed", this._documentUnload); + this._earlyEvents.slice(0, this._earlyEvents.length); + this._emit("detach"); + } + }, + + /** + * Receive an event from the content script that need to be sent to + * worker.port. Provide a way for composed object to catch all events. + */ + _onContentScriptEvent: function _onContentScriptEvent() { + this._port._emit.apply(this._port, arguments); + }, + + /** + * Reference to the content side of the worker. + * @type {WorkerGlobalScope} + */ + _contentWorker: null, + + /** + * Reference to the window that is accessible from + * the content scripts. + * @type {Object} + */ + _window: null, + + /** + * Flag to enable `addon` object injection in document. (bug 612726) + * @type {Boolean} + */ + _injectInDocument: false +}); +exports.Worker = Worker; |