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Diffstat (limited to 'toolkit/components/extensions/ExtensionContent.jsm')
| -rw-r--r-- | toolkit/components/extensions/ExtensionContent.jsm | 1048 |
1 files changed, 1048 insertions, 0 deletions
diff --git a/toolkit/components/extensions/ExtensionContent.jsm b/toolkit/components/extensions/ExtensionContent.jsm new file mode 100644 index 000000000..9b9a02091 --- /dev/null +++ b/toolkit/components/extensions/ExtensionContent.jsm @@ -0,0 +1,1048 @@ +/* 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 = ["ExtensionContent"]; + +/* globals ExtensionContent */ + +/* + * This file handles the content process side of extensions. It mainly + * takes care of content script injection, content script APIs, and + * messaging. + * + * This file is also the initial entry point for addon processes. + * ExtensionChild.jsm is responsible for functionality specific to addon + * processes. + */ + +const Ci = Components.interfaces; +const Cc = Components.classes; +const Cu = Components.utils; +const Cr = Components.results; + +Cu.import("resource://gre/modules/XPCOMUtils.jsm"); +Cu.import("resource://gre/modules/Services.jsm"); +Cu.import("resource://gre/modules/AppConstants.jsm"); + +XPCOMUtils.defineLazyModuleGetter(this, "ExtensionManagement", + "resource://gre/modules/ExtensionManagement.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "LanguageDetector", + "resource:///modules/translation/LanguageDetector.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "MatchPattern", + "resource://gre/modules/MatchPattern.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "MatchGlobs", + "resource://gre/modules/MatchPattern.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "MessageChannel", + "resource://gre/modules/MessageChannel.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "PromiseUtils", + "resource://gre/modules/PromiseUtils.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "Schemas", + "resource://gre/modules/Schemas.jsm"); +XPCOMUtils.defineLazyModuleGetter(this, "WebNavigationFrames", + "resource://gre/modules/WebNavigationFrames.jsm"); + +Cu.import("resource://gre/modules/ExtensionChild.jsm"); +Cu.import("resource://gre/modules/ExtensionCommon.jsm"); +Cu.import("resource://gre/modules/ExtensionUtils.jsm"); + +const { + EventEmitter, + LocaleData, + defineLazyGetter, + flushJarCache, + getInnerWindowID, + promiseDocumentReady, + runSafeSyncWithoutClone, +} = ExtensionUtils; + +const { + BaseContext, + SchemaAPIManager, +} = ExtensionCommon; + +const { + ChildAPIManager, + Messenger, +} = ExtensionChild; + +XPCOMUtils.defineLazyGetter(this, "console", ExtensionUtils.getConsole); + +const CATEGORY_EXTENSION_SCRIPTS_CONTENT = "webextension-scripts-content"; + +function isWhenBeforeOrSame(when1, when2) { + let table = {"document_start": 0, + "document_end": 1, + "document_idle": 2}; + return table[when1] <= table[when2]; +} + +var apiManager = new class extends SchemaAPIManager { + constructor() { + super("content"); + this.initialized = false; + } + + generateAPIs(...args) { + if (!this.initialized) { + this.initialized = true; + for (let [/* name */, value] of XPCOMUtils.enumerateCategoryEntries(CATEGORY_EXTENSION_SCRIPTS_CONTENT)) { + this.loadScript(value); + } + } + return super.generateAPIs(...args); + } + + registerSchemaAPI(namespace, envType, getAPI) { + if (envType == "content_child") { + super.registerSchemaAPI(namespace, envType, getAPI); + } + } +}(); + +// Represents a content script. +function Script(extension, options, deferred = PromiseUtils.defer()) { + this.extension = extension; + this.options = options; + this.run_at = this.options.run_at; + this.js = this.options.js || []; + this.css = this.options.css || []; + this.remove_css = this.options.remove_css; + this.match_about_blank = this.options.match_about_blank; + + this.deferred = deferred; + + this.matches_ = new MatchPattern(this.options.matches); + this.exclude_matches_ = new MatchPattern(this.options.exclude_matches || null); + // TODO: MatchPattern should pre-mangle host-only patterns so that we + // don't need to call a separate match function. + this.matches_host_ = new MatchPattern(this.options.matchesHost || null); + this.include_globs_ = new MatchGlobs(this.options.include_globs); + this.exclude_globs_ = new MatchGlobs(this.options.exclude_globs); + + this.requiresCleanup = !this.remove_css && (this.css.length > 0 || options.cssCode); +} + +Script.prototype = { + get cssURLs() { + // We can handle CSS urls (css) and CSS code (cssCode). + let urls = []; + for (let url of this.css) { + urls.push(this.extension.baseURI.resolve(url)); + } + + if (this.options.cssCode) { + let url = "data:text/css;charset=utf-8," + encodeURIComponent(this.options.cssCode); + urls.push(url); + } + + return urls; + }, + + matches(window) { + let uri = window.document.documentURIObject; + let principal = window.document.nodePrincipal; + + // If mozAddonManager is present on this page, don't allow + // content scripts. + if (window.navigator.mozAddonManager !== undefined) { + return false; + } + + if (this.match_about_blank && ["about:blank", "about:srcdoc"].includes(uri.spec)) { + // When matching about:blank/srcdoc documents, the checks below + // need to be performed against the "owner" document's URI. + uri = principal.URI; + } + + // Documents from data: URIs also inherit the principal. + if (Services.netUtils.URIChainHasFlags(uri, Ci.nsIProtocolHandler.URI_INHERITS_SECURITY_CONTEXT)) { + if (!this.match_about_blank) { + return false; + } + uri = principal.URI; + } + + if (!(this.matches_.matches(uri) || this.matches_host_.matchesIgnoringPath(uri))) { + return false; + } + + if (this.exclude_matches_.matches(uri)) { + return false; + } + + if (this.options.include_globs != null) { + if (!this.include_globs_.matches(uri.spec)) { + return false; + } + } + + if (this.exclude_globs_.matches(uri.spec)) { + return false; + } + + if (this.options.frame_id != null) { + if (WebNavigationFrames.getFrameId(window) != this.options.frame_id) { + return false; + } + } else if (!this.options.all_frames && window.top != window) { + return false; + } + + return true; + }, + + cleanup(window) { + if (!this.remove_css) { + let winUtils = window.QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDOMWindowUtils); + + for (let url of this.cssURLs) { + runSafeSyncWithoutClone(winUtils.removeSheetUsingURIString, url, winUtils.AUTHOR_SHEET); + } + } + }, + + /** + * Tries to inject this script into the given window and sandbox, if + * there are pending operations for the window's current load state. + * + * @param {Window} window + * The DOM Window to inject the scripts and CSS into. + * @param {Sandbox} sandbox + * A Sandbox inheriting from `window` in which to evaluate the + * injected scripts. + * @param {function} shouldRun + * A function which, when passed the document load state that a + * script is expected to run at, returns `true` if we should + * currently be injecting scripts for that load state. + * + * For initial injection of a script, this function should + * return true if the document is currently in or has already + * passed through the given state. For injections triggered by + * document state changes, it should only return true if the + * given state exactly matches the state that triggered the + * change. + * @param {string} when + * The document's current load state, or if triggered by a + * document state change, the new document state that triggered + * the injection. + */ + tryInject(window, sandbox, shouldRun, when) { + if (shouldRun("document_start")) { + let {cssURLs} = this; + if (cssURLs.length > 0) { + let winUtils = window.QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDOMWindowUtils); + + let method = this.remove_css ? winUtils.removeSheetUsingURIString : winUtils.loadSheetUsingURIString; + for (let url of cssURLs) { + runSafeSyncWithoutClone(method, url, winUtils.AUTHOR_SHEET); + } + + this.deferred.resolve(); + } + } + + let result; + let scheduled = this.run_at || "document_idle"; + if (shouldRun(scheduled)) { + for (let [i, url] of this.js.entries()) { + let options = { + target: sandbox, + charset: "UTF-8", + // Inject the last script asynchronously unless we're expected to + // inject before any page scripts have run, and we haven't already + // missed that boat. + async: (i === this.js.length - 1) && + (this.run_at !== "document_start" || when !== "document_start"), + }; + try { + result = Services.scriptloader.loadSubScriptWithOptions(url, options); + } catch (e) { + Cu.reportError(e); + this.deferred.reject(e); + } + } + + if (this.options.jsCode) { + try { + result = Cu.evalInSandbox(this.options.jsCode, sandbox, "latest"); + } catch (e) { + Cu.reportError(e); + this.deferred.reject(e); + } + } + + this.deferred.resolve(result); + } + }, +}; + +function getWindowMessageManager(contentWindow) { + let ir = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDocShell) + .QueryInterface(Ci.nsIInterfaceRequestor); + try { + return ir.getInterface(Ci.nsIContentFrameMessageManager); + } catch (e) { + // Some windows don't support this interface (hidden window). + return null; + } +} + +var DocumentManager; +var ExtensionManager; + +/** + * An execution context for semi-privileged extension content scripts. + * + * This is the child side of the ContentScriptContextParent class + * defined in ExtensionParent.jsm. + */ +class ContentScriptContextChild extends BaseContext { + constructor(extension, contentWindow, contextOptions = {}) { + super("content_child", extension); + + let {isExtensionPage} = contextOptions; + + this.isExtensionPage = isExtensionPage; + + this.setContentWindow(contentWindow); + + let frameId = WebNavigationFrames.getFrameId(contentWindow); + this.frameId = frameId; + + this.scripts = []; + + let contentPrincipal = contentWindow.document.nodePrincipal; + let ssm = Services.scriptSecurityManager; + + // copy origin attributes from the content window origin attributes to + // preserve the user context id. overwrite the addonId. + let attrs = contentPrincipal.originAttributes; + attrs.addonId = this.extension.id; + let extensionPrincipal = ssm.createCodebasePrincipal(this.extension.baseURI, attrs); + + let principal; + if (ssm.isSystemPrincipal(contentPrincipal)) { + // Make sure we don't hand out the system principal by accident. + // also make sure that the null principal has the right origin attributes + principal = ssm.createNullPrincipal(attrs); + } else { + principal = [contentPrincipal, extensionPrincipal]; + } + + if (isExtensionPage) { + if (ExtensionManagement.getAddonIdForWindow(this.contentWindow) != this.extension.id) { + throw new Error("Invalid target window for this extension context"); + } + // This is an iframe with content script API enabled and its principal should be the + // contentWindow itself. (we create a sandbox with the contentWindow as principal and with X-rays disabled + // because it enables us to create the APIs object in this sandbox object and then copying it + // into the iframe's window, see Bug 1214658 for rationale) + this.sandbox = Cu.Sandbox(contentWindow, { + sandboxPrototype: contentWindow, + sameZoneAs: contentWindow, + wantXrays: false, + isWebExtensionContentScript: true, + }); + } else { + // This metadata is required by the Developer Tools, in order for + // the content script to be associated with both the extension and + // the tab holding the content page. + let metadata = { + "inner-window-id": this.innerWindowID, + addonId: attrs.addonId, + }; + + this.sandbox = Cu.Sandbox(principal, { + metadata, + sandboxPrototype: contentWindow, + sameZoneAs: contentWindow, + wantXrays: true, + isWebExtensionContentScript: true, + wantExportHelpers: true, + wantGlobalProperties: ["XMLHttpRequest", "fetch"], + originAttributes: attrs, + }); + + Cu.evalInSandbox(` + window.JSON = JSON; + window.XMLHttpRequest = XMLHttpRequest; + window.fetch = fetch; + `, this.sandbox); + } + + Object.defineProperty(this, "principal", { + value: Cu.getObjectPrincipal(this.sandbox), + enumerable: true, + configurable: true, + }); + + this.url = contentWindow.location.href; + + defineLazyGetter(this, "chromeObj", () => { + let chromeObj = Cu.createObjectIn(this.sandbox); + + Schemas.inject(chromeObj, this.childManager); + return chromeObj; + }); + + Schemas.exportLazyGetter(this.sandbox, "browser", () => this.chromeObj); + Schemas.exportLazyGetter(this.sandbox, "chrome", () => this.chromeObj); + + // This is an iframe with content script API enabled (bug 1214658) + if (isExtensionPage) { + Schemas.exportLazyGetter(this.contentWindow, + "browser", () => this.chromeObj); + Schemas.exportLazyGetter(this.contentWindow, + "chrome", () => this.chromeObj); + } + } + + get cloneScope() { + return this.sandbox; + } + + execute(script, shouldRun, when) { + script.tryInject(this.contentWindow, this.sandbox, shouldRun, when); + } + + addScript(script, when) { + let state = DocumentManager.getWindowState(this.contentWindow); + this.execute(script, scheduled => isWhenBeforeOrSame(scheduled, state), when); + + // Save the script in case it has pending operations in later load + // states, but only if we're before document_idle, or require cleanup. + if (state != "document_idle" || script.requiresCleanup) { + this.scripts.push(script); + } + } + + triggerScripts(documentState) { + for (let script of this.scripts) { + this.execute(script, scheduled => scheduled == documentState, documentState); + } + if (documentState == "document_idle") { + // Don't bother saving scripts after document_idle. + this.scripts = this.scripts.filter(script => script.requiresCleanup); + } + } + + close() { + super.unload(); + + if (this.contentWindow) { + for (let script of this.scripts) { + if (script.requiresCleanup) { + script.cleanup(this.contentWindow); + } + } + + // Overwrite the content script APIs with an empty object if the APIs objects are still + // defined in the content window (bug 1214658). + if (this.isExtensionPage) { + Cu.createObjectIn(this.contentWindow, {defineAs: "browser"}); + Cu.createObjectIn(this.contentWindow, {defineAs: "chrome"}); + } + } + Cu.nukeSandbox(this.sandbox); + this.sandbox = null; + } +} + +defineLazyGetter(ContentScriptContextChild.prototype, "messenger", function() { + // The |sender| parameter is passed directly to the extension. + let sender = {id: this.extension.uuid, frameId: this.frameId, url: this.url}; + let filter = {extensionId: this.extension.id}; + let optionalFilter = {frameId: this.frameId}; + + return new Messenger(this, [this.messageManager], sender, filter, optionalFilter); +}); + +defineLazyGetter(ContentScriptContextChild.prototype, "childManager", function() { + let localApis = {}; + apiManager.generateAPIs(this, localApis); + + let childManager = new ChildAPIManager(this, this.messageManager, localApis, { + envType: "content_parent", + url: this.url, + }); + + this.callOnClose(childManager); + + return childManager; +}); + +// Responsible for creating ExtensionContexts and injecting content +// scripts into them when new documents are created. +DocumentManager = { + extensionCount: 0, + + // Map[windowId -> Map[extensionId -> ContentScriptContextChild]] + contentScriptWindows: new Map(), + + // Map[windowId -> ContentScriptContextChild] + extensionPageWindows: new Map(), + + init() { + Services.obs.addObserver(this, "content-document-global-created", false); + Services.obs.addObserver(this, "document-element-inserted", false); + Services.obs.addObserver(this, "inner-window-destroyed", false); + }, + + uninit() { + Services.obs.removeObserver(this, "content-document-global-created"); + Services.obs.removeObserver(this, "document-element-inserted"); + Services.obs.removeObserver(this, "inner-window-destroyed"); + }, + + getWindowState(contentWindow) { + let readyState = contentWindow.document.readyState; + if (readyState == "complete") { + return "document_idle"; + } + if (readyState == "interactive") { + return "document_end"; + } + return "document_start"; + }, + + loadInto(window) { + // Enable the content script APIs should be available in subframes' window + // if it is recognized as a valid addon id (see Bug 1214658 for rationale). + const { + NO_PRIVILEGES, + CONTENTSCRIPT_PRIVILEGES, + FULL_PRIVILEGES, + } = ExtensionManagement.API_LEVELS; + let extensionId = ExtensionManagement.getAddonIdForWindow(window); + let apiLevel = ExtensionManagement.getAPILevelForWindow(window, extensionId); + + if (apiLevel != NO_PRIVILEGES) { + let extension = ExtensionManager.get(extensionId); + if (extension) { + if (apiLevel == CONTENTSCRIPT_PRIVILEGES) { + DocumentManager.getExtensionPageContext(extension, window); + } else if (apiLevel == FULL_PRIVILEGES) { + ExtensionChild.createExtensionContext(extension, window); + } + } + } + }, + + observe: function(subject, topic, data) { + // For some types of documents (about:blank), we only see the first + // notification, for others (data: URIs) we only observe the second. + if (topic == "content-document-global-created" || topic == "document-element-inserted") { + let document = subject; + let window = document && document.defaultView; + + if (topic == "content-document-global-created") { + window = subject; + document = window && window.document; + } + + if (!document || !document.location || !window) { + return; + } + + // Make sure we only load into frames that ExtensionContent.init + // was called on (i.e., not frames for social or sidebars). + let mm = getWindowMessageManager(window); + if (!mm || !ExtensionContent.globals.has(mm)) { + return; + } + + // Load on document-element-inserted, except for about:blank which doesn't + // see it, and needs special late handling on DOMContentLoaded event. + if (topic === "document-element-inserted") { + this.loadInto(window); + this.trigger("document_start", window); + } + + /* eslint-disable mozilla/balanced-listeners */ + window.addEventListener("DOMContentLoaded", this, true); + window.addEventListener("load", this, true); + /* eslint-enable mozilla/balanced-listeners */ + } else if (topic == "inner-window-destroyed") { + let windowId = subject.QueryInterface(Ci.nsISupportsPRUint64).data; + + MessageChannel.abortResponses({innerWindowID: windowId}); + + // Close any existent content-script context for the destroyed window. + if (this.contentScriptWindows.has(windowId)) { + let extensions = this.contentScriptWindows.get(windowId); + for (let [, context] of extensions) { + context.close(); + } + + this.contentScriptWindows.delete(windowId); + } + + // Close any existent iframe extension page context for the destroyed window. + if (this.extensionPageWindows.has(windowId)) { + let context = this.extensionPageWindows.get(windowId); + context.close(); + this.extensionPageWindows.delete(windowId); + } + + ExtensionChild.destroyExtensionContext(windowId); + } + }, + + handleEvent: function(event) { + let window = event.currentTarget; + if (event.target != window.document) { + // We use capturing listeners so we have precedence over content script + // listeners, but only care about events targeted to the element we're + // listening on. + return; + } + window.removeEventListener(event.type, this, true); + + // Need to check if we're still on the right page? Greasemonkey does this. + + if (event.type == "DOMContentLoaded") { + // By this time, we can be sure if this is an explicit about:blank + // document, and if it needs special late loading and fake trigger. + if (window.location.href === "about:blank") { + this.loadInto(window); + this.trigger("document_start", window); + } + this.trigger("document_end", window); + } else if (event.type == "load") { + this.trigger("document_idle", window); + } + }, + + // Used to executeScript, insertCSS and removeCSS. + executeScript(global, extensionId, options) { + let extension = ExtensionManager.get(extensionId); + + let executeInWin = (window) => { + let deferred = PromiseUtils.defer(); + let script = new Script(extension, options, deferred); + + if (script.matches(window)) { + let context = this.getContentScriptContext(extension, window); + context.addScript(script); + return deferred.promise; + } + return null; + }; + + let promises = Array.from(this.enumerateWindows(global.docShell), executeInWin) + .filter(promise => promise); + + if (!promises.length) { + let details = {}; + for (let key of ["all_frames", "frame_id", "matches_about_blank", "matchesHost"]) { + if (key in options) { + details[key] = options[key]; + } + } + + return Promise.reject({message: `No window matching ${JSON.stringify(details)}`}); + } + if (!options.all_frames && promises.length > 1) { + return Promise.reject({message: `Internal error: Script matched multiple windows`}); + } + return Promise.all(promises); + }, + + enumerateWindows: function* (docShell) { + let window = docShell.QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDOMWindow); + yield window; + + for (let i = 0; i < docShell.childCount; i++) { + let child = docShell.getChildAt(i).QueryInterface(Ci.nsIDocShell); + yield* this.enumerateWindows(child); + } + }, + + getContentScriptGlobalsForWindow(window) { + let winId = getInnerWindowID(window); + let extensions = this.contentScriptWindows.get(winId); + + if (extensions) { + return Array.from(extensions.values(), ctx => ctx.sandbox); + } + + return []; + }, + + getContentScriptContext(extension, window) { + let winId = getInnerWindowID(window); + if (!this.contentScriptWindows.has(winId)) { + this.contentScriptWindows.set(winId, new Map()); + } + + let extensions = this.contentScriptWindows.get(winId); + if (!extensions.has(extension.id)) { + let context = new ContentScriptContextChild(extension, window); + extensions.set(extension.id, context); + } + + return extensions.get(extension.id); + }, + + getExtensionPageContext(extension, window) { + let winId = getInnerWindowID(window); + + let context = this.extensionPageWindows.get(winId); + if (!context) { + let context = new ContentScriptContextChild(extension, window, {isExtensionPage: true}); + this.extensionPageWindows.set(winId, context); + } + + return context; + }, + + startupExtension(extensionId) { + if (this.extensionCount == 0) { + this.init(); + } + this.extensionCount++; + + let extension = ExtensionManager.get(extensionId); + for (let global of ExtensionContent.globals.keys()) { + // Note that we miss windows in the bfcache here. In theory we + // could execute content scripts on a pageshow event for that + // window, but that seems extreme. + for (let window of this.enumerateWindows(global.docShell)) { + for (let script of extension.scripts) { + if (script.matches(window)) { + let context = this.getContentScriptContext(extension, window); + context.addScript(script); + } + } + } + } + }, + + shutdownExtension(extensionId) { + // Clean up content-script contexts on extension shutdown. + for (let [, extensions] of this.contentScriptWindows) { + let context = extensions.get(extensionId); + if (context) { + context.close(); + extensions.delete(extensionId); + } + } + + // Clean up iframe extension page contexts on extension shutdown. + for (let [winId, context] of this.extensionPageWindows) { + if (context.extension.id == extensionId) { + context.close(); + this.extensionPageWindows.delete(winId); + } + } + + ExtensionChild.shutdownExtension(extensionId); + + MessageChannel.abortResponses({extensionId}); + + this.extensionCount--; + if (this.extensionCount == 0) { + this.uninit(); + } + }, + + trigger(when, window) { + if (when === "document_start") { + for (let extension of ExtensionManager.extensions.values()) { + for (let script of extension.scripts) { + if (script.matches(window)) { + let context = this.getContentScriptContext(extension, window); + context.addScript(script, when); + } + } + } + } else { + let contexts = this.contentScriptWindows.get(getInnerWindowID(window)) || new Map(); + for (let context of contexts.values()) { + context.triggerScripts(when); + } + } + }, +}; + +// Represents a browser extension in the content process. +class BrowserExtensionContent extends EventEmitter { + constructor(data) { + super(); + + this.id = data.id; + this.uuid = data.uuid; + this.data = data; + this.instanceId = data.instanceId; + + this.MESSAGE_EMIT_EVENT = `Extension:EmitEvent:${this.instanceId}`; + Services.cpmm.addMessageListener(this.MESSAGE_EMIT_EVENT, this); + + this.scripts = data.content_scripts.map(scriptData => new Script(this, scriptData)); + this.webAccessibleResources = new MatchGlobs(data.webAccessibleResources); + this.whiteListedHosts = new MatchPattern(data.whiteListedHosts); + this.permissions = data.permissions; + this.principal = data.principal; + + this.localeData = new LocaleData(data.localeData); + + this.manifest = data.manifest; + this.baseURI = Services.io.newURI(data.baseURL, null, null); + + // Only used in addon processes. + this.views = new Set(); + + let uri = Services.io.newURI(data.resourceURL, null, null); + + if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT) { + // Extension.jsm takes care of this in the parent. + ExtensionManagement.startupExtension(this.uuid, uri, this); + } + } + + shutdown() { + Services.cpmm.removeMessageListener(this.MESSAGE_EMIT_EVENT, this); + + if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT) { + ExtensionManagement.shutdownExtension(this.uuid); + } + } + + emit(event, ...args) { + Services.cpmm.sendAsyncMessage(this.MESSAGE_EMIT_EVENT, {event, args}); + + super.emit(event, ...args); + } + + receiveMessage({name, data}) { + if (name === this.MESSAGE_EMIT_EVENT) { + super.emit(data.event, ...data.args); + } + } + + localizeMessage(...args) { + return this.localeData.localizeMessage(...args); + } + + localize(...args) { + return this.localeData.localize(...args); + } + + hasPermission(perm) { + let match = /^manifest:(.*)/.exec(perm); + if (match) { + return this.manifest[match[1]] != null; + } + return this.permissions.has(perm); + } +} + +ExtensionManager = { + // Map[extensionId, BrowserExtensionContent] + extensions: new Map(), + + init() { + Schemas.init(); + ExtensionChild.initOnce(); + + Services.cpmm.addMessageListener("Extension:Startup", this); + Services.cpmm.addMessageListener("Extension:Shutdown", this); + Services.cpmm.addMessageListener("Extension:FlushJarCache", this); + + if (Services.cpmm.initialProcessData && "Extension:Extensions" in Services.cpmm.initialProcessData) { + let extensions = Services.cpmm.initialProcessData["Extension:Extensions"]; + for (let data of extensions) { + this.extensions.set(data.id, new BrowserExtensionContent(data)); + DocumentManager.startupExtension(data.id); + } + } + }, + + get(extensionId) { + return this.extensions.get(extensionId); + }, + + receiveMessage({name, data}) { + let extension; + switch (name) { + case "Extension:Startup": { + extension = new BrowserExtensionContent(data); + + this.extensions.set(data.id, extension); + + DocumentManager.startupExtension(data.id); + + Services.cpmm.sendAsyncMessage("Extension:StartupComplete"); + break; + } + + case "Extension:Shutdown": { + extension = this.extensions.get(data.id); + extension.shutdown(); + + DocumentManager.shutdownExtension(data.id); + + this.extensions.delete(data.id); + break; + } + + case "Extension:FlushJarCache": { + let nsIFile = Components.Constructor("@mozilla.org/file/local;1", "nsIFile", + "initWithPath"); + let file = new nsIFile(data.path); + flushJarCache(file); + Services.cpmm.sendAsyncMessage("Extension:FlushJarCacheComplete"); + break; + } + } + }, +}; + +class ExtensionGlobal { + constructor(global) { + this.global = global; + + MessageChannel.addListener(global, "Extension:Capture", this); + MessageChannel.addListener(global, "Extension:DetectLanguage", this); + MessageChannel.addListener(global, "Extension:Execute", this); + MessageChannel.addListener(global, "WebNavigation:GetFrame", this); + MessageChannel.addListener(global, "WebNavigation:GetAllFrames", this); + + this.windowId = global.content + .QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDOMWindowUtils) + .outerWindowID; + + global.sendAsyncMessage("Extension:TopWindowID", {windowId: this.windowId}); + } + + uninit() { + this.global.sendAsyncMessage("Extension:RemoveTopWindowID", {windowId: this.windowId}); + } + + get messageFilterStrict() { + return { + innerWindowID: getInnerWindowID(this.global.content), + }; + } + + receiveMessage({target, messageName, recipient, data}) { + switch (messageName) { + case "Extension:Capture": + return this.handleExtensionCapture(data.width, data.height, data.options); + case "Extension:DetectLanguage": + return this.handleDetectLanguage(target); + case "Extension:Execute": + return this.handleExtensionExecute(target, recipient.extensionId, data.options); + case "WebNavigation:GetFrame": + return this.handleWebNavigationGetFrame(data.options); + case "WebNavigation:GetAllFrames": + return this.handleWebNavigationGetAllFrames(); + } + } + + handleExtensionCapture(width, height, options) { + let win = this.global.content; + + const XHTML_NS = "http://www.w3.org/1999/xhtml"; + let canvas = win.document.createElementNS(XHTML_NS, "canvas"); + canvas.width = width; + canvas.height = height; + canvas.mozOpaque = true; + + let ctx = canvas.getContext("2d"); + + // We need to scale the image to the visible size of the browser, + // in order for the result to appear as the user sees it when + // settings like full zoom come into play. + ctx.scale(canvas.width / win.innerWidth, canvas.height / win.innerHeight); + + ctx.drawWindow(win, win.scrollX, win.scrollY, win.innerWidth, win.innerHeight, "#fff"); + + return canvas.toDataURL(`image/${options.format}`, options.quality / 100); + } + + handleDetectLanguage(target) { + let doc = target.content.document; + + return promiseDocumentReady(doc).then(() => { + let elem = doc.documentElement; + + let language = (elem.getAttribute("xml:lang") || elem.getAttribute("lang") || + doc.contentLanguage || null); + + // We only want the last element of the TLD here. + // Only country codes have any effect on the results, but other + // values cause no harm. + let tld = doc.location.hostname.match(/[a-z]*$/)[0]; + + // The CLD2 library used by the language detector is capable of + // analyzing raw HTML. Unfortunately, that takes much more memory, + // and since it's hosted by emscripten, and therefore can't shrink + // its heap after it's grown, it has a performance cost. + // So we send plain text instead. + let encoder = Cc["@mozilla.org/layout/documentEncoder;1?type=text/plain"].createInstance(Ci.nsIDocumentEncoder); + encoder.init(doc, "text/plain", encoder.SkipInvisibleContent); + let text = encoder.encodeToStringWithMaxLength(60 * 1024); + + let encoding = doc.characterSet; + + return LanguageDetector.detectLanguage({language, tld, text, encoding}) + .then(result => result.language === "un" ? "und" : result.language); + }); + } + + // Used to executeScript, insertCSS and removeCSS. + handleExtensionExecute(target, extensionId, options) { + return DocumentManager.executeScript(target, extensionId, options).then(result => { + try { + // Make sure we can structured-clone the result value before + // we try to send it back over the message manager. + Cu.cloneInto(result, target); + } catch (e) { + return Promise.reject({message: "Script returned non-structured-clonable data"}); + } + return result; + }); + } + + handleWebNavigationGetFrame({frameId}) { + return WebNavigationFrames.getFrame(this.global.docShell, frameId); + } + + handleWebNavigationGetAllFrames() { + return WebNavigationFrames.getAllFrames(this.global.docShell); + } +} + +this.ExtensionContent = { + globals: new Map(), + + init(global) { + this.globals.set(global, new ExtensionGlobal(global)); + ExtensionChild.init(global); + }, + + uninit(global) { + ExtensionChild.uninit(global); + this.globals.get(global).uninit(); + this.globals.delete(global); + }, + + // This helper is exported to be integrated in the devtools RDP actors, + // that can use it to retrieve the existent WebExtensions ContentScripts + // of a target window and be able to show the ContentScripts source in the + // DevTools Debugger panel. + getContentScriptGlobalsForWindow(window) { + return DocumentManager.getContentScriptGlobalsForWindow(window); + }, +}; + +ExtensionManager.init(); |