Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
/* 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
/**
* This file handles privileged extension page logic that runs in the
* child process.
*/
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
ExtensionChildDevToolsUtils:
"resource://gre/modules/ExtensionChildDevToolsUtils.sys.mjs",
Schemas: "resource://gre/modules/Schemas.sys.mjs",
});
const CATEGORY_EXTENSION_SCRIPTS_ADDON = "webextension-scripts-addon";
const CATEGORY_EXTENSION_SCRIPTS_DEVTOOLS = "webextension-scripts-devtools";
import { ExtensionCommon } from "resource://gre/modules/ExtensionCommon.sys.mjs";
import {
ChildAPIManager,
ExtensionActivityLogChild,
Messenger,
} from "resource://gre/modules/ExtensionChild.sys.mjs";
import { ExtensionUtils } from "resource://gre/modules/ExtensionUtils.sys.mjs";
const { getInnerWindowID, promiseEvent } = ExtensionUtils;
const { BaseContext, CanOfAPIs, SchemaAPIManager, redefineGetter } =
ExtensionCommon;
const initializeBackgroundPage = context => {
// Override the `alert()` method inside background windows;
// we alias it to console.log().
let alertDisplayedWarning = false;
const innerWindowID = getInnerWindowID(context.contentWindow);
/** @param {{ text, filename, lineNumber?, columnNumber? }} options */
function logWarningMessage({ text, filename, lineNumber, columnNumber }) {
let consoleMsg = Cc["@mozilla.org/scripterror;1"].createInstance(
Ci.nsIScriptError
);
consoleMsg.initWithWindowID(
text,
filename,
lineNumber,
columnNumber,
Ci.nsIScriptError.warningFlag,
"webextension",
innerWindowID
);
Services.console.logMessage(consoleMsg);
}
function ignoredSuspendListener() {
logWarningMessage({
text: "Background event page was not terminated on idle because a DevTools toolbox is attached to the extension.",
filename: context.contentWindow.location.href,
});
}
if (!context.extension.manifest.background.persistent) {
context.extension.on(
"background-script-suspend-ignored",
ignoredSuspendListener
);
context.callOnClose({
close: () => {
context.extension.off(
"background-script-suspend-ignored",
ignoredSuspendListener
);
},
});
}
let alertOverwrite = text => {
const { filename, columnNumber, lineNumber } = Components.stack.caller;
if (!alertDisplayedWarning) {
context.childManager.callParentAsyncFunction(
"runtime.openBrowserConsole",
[]
);
logWarningMessage({
text: "alert() is not supported in background windows; please use console.log instead.",
filename,
lineNumber,
columnNumber,
});
alertDisplayedWarning = true;
}
logWarningMessage({ text, filename, lineNumber, columnNumber });
};
Cu.exportFunction(alertOverwrite, context.contentWindow, {
defineAs: "alert",
});
};
var apiManager = new (class extends SchemaAPIManager {
constructor() {
super("addon", lazy.Schemas);
this.initialized = false;
}
lazyInit() {
if (!this.initialized) {
this.initialized = true;
this.initGlobal();
for (let { value } of Services.catMan.enumerateCategory(
CATEGORY_EXTENSION_SCRIPTS_ADDON
)) {
this.loadScript(value);
}
}
}
})();
var devtoolsAPIManager = new (class extends SchemaAPIManager {
constructor() {
super("devtools", lazy.Schemas);
this.initialized = false;
}
lazyInit() {
if (!this.initialized) {
this.initialized = true;
this.initGlobal();
for (let { value } of Services.catMan.enumerateCategory(
CATEGORY_EXTENSION_SCRIPTS_DEVTOOLS
)) {
this.loadScript(value);
}
}
}
})();
export function getContextChildManagerGetter(
{ envType },
ChildAPIManagerClass = ChildAPIManager
) {
return function () {
let apiManager =
envType === "devtools_parent"
? devtoolsAPIManager
: this.extension.apiManager;
apiManager.lazyInit();
let localApis = {};
let can = new CanOfAPIs(this, apiManager, localApis);
let childManager = new ChildAPIManagerClass(
this,
this.messageManager,
can,
{
envType,
viewType: this.viewType,
url: this.uri.spec,
incognito: this.incognito,
// Additional data a BaseContext subclass may optionally send
// as part of the CreateProxyContext request sent to the main process
// (e.g. WorkerContexChild implements this method to send the service
// worker descriptor id along with the details send by default here).
...this.getCreateProxyContextData?.(),
}
);
this.callOnClose(childManager);
return childManager;
};
}
export class ExtensionBaseContextChild extends BaseContext {
/**
* This ExtensionBaseContextChild represents an addon execution environment
* that is running in an addon or devtools child process.
*
* @param {ExtensionChild} extension This context's owner.
* @param {object} params
* @param {string} params.envType One of "addon_child" or "devtools_child".
* @param {nsIDOMWindow} params.contentWindow The window where the addon runs.
* @param {string} params.viewType One of "background", "popup", "tab",
* "sidebar", "devtools_page" or "devtools_panel".
* @param {number} [params.tabId] This tab's ID, used if viewType is "tab".
* @param {nsIURI} [params.uri] The URI of the page.
*/
constructor(extension, params) {
if (!params.envType) {
throw new Error("Missing envType");
}
super(params.envType, extension);
let { viewType = "tab", uri, contentWindow, tabId } = params;
this.viewType = viewType;
this.uri = uri || extension.baseURI;
this.setContentWindow(contentWindow);
this.browsingContextId = contentWindow.docShell.browsingContext.id;
if (viewType == "tab") {
Object.defineProperty(this, "tabId", {
value: tabId,
enumerable: true,
configurable: true,
});
}
lazy.Schemas.exportLazyGetter(contentWindow, "browser", () => {
return this.browserObj;
});
lazy.Schemas.exportLazyGetter(contentWindow, "chrome", () => {
// For MV3 and later, this is just an alias for browser.
if (extension.manifestVersion > 2) {
return this.browserObj;
}
// Chrome compat is only used with MV2
let chromeApiWrapper = Object.create(this.childManager);
chromeApiWrapper.isChromeCompat = true;
let chromeObj = Cu.createObjectIn(contentWindow);
chromeApiWrapper.inject(chromeObj);
return chromeObj;
});
}
get browserObj() {
const browserObj = Cu.createObjectIn(this.contentWindow);
this.childManager.inject(browserObj);
return redefineGetter(this, "browserObj", browserObj);
}
logActivity(type, name, data) {
ExtensionActivityLogChild.log(this, type, name, data);
}
get cloneScope() {
return this.contentWindow;
}
get principal() {
return this.contentWindow.document.nodePrincipal;
}
get tabId() {
// Will be overwritten in the constructor if necessary.
return -1;
}
// Called when the extension shuts down.
shutdown() {
if (this.contentWindow) {
this.contentWindow.close();
}
this.unload();
}
// This method is called when an extension page navigates away or
// its tab is closed.
unload() {
// Note that without this guard, we end up running unload code
// multiple times for tab pages closed by the "page-unload" handlers
// triggered below.
if (this.unloaded) {
return;
}
super.unload();
}
get messenger() {
return redefineGetter(this, "messenger", new Messenger(this));
}
/** @type {ReturnType<ReturnType<getContextChildManagerGetter>>} */
get childManager() {
throw new Error("childManager getter must be overridden");
}
}
class ExtensionPageContextChild extends ExtensionBaseContextChild {
/**
* This ExtensionPageContextChild represents a privileged addon
* execution environment that has full access to the WebExtensions
* APIs (provided that the correct permissions have been requested).
*
* This is the child side of the ExtensionPageContextParent class
* defined in ExtensionParent.sys.mjs.
*
* @param {ExtensionChild} extension This context's owner.
* @param {object} params
* @param {nsIDOMWindow} params.contentWindow The window where the addon runs.
* @param {string} params.viewType One of "background", "popup", "sidebar" or "tab".
* "background", "sidebar" and "tab" are used by `browser.extension.getViews`.
* "popup" is only used internally to identify page action and browser
* action popups and options_ui pages.
* @param {number} [params.tabId] This tab's ID, used if viewType is "tab".
* @param {nsIURI} [params.uri] The URI of the page.
*/
constructor(extension, params) {
super(extension, Object.assign(params, { envType: "addon_child" }));
if (this.viewType == "background") {
initializeBackgroundPage(this);
}
this.extension.views.add(this);
}
unload() {
super.unload();
this.extension.views.delete(this);
}
get childManager() {
const childManager = getContextChildManagerGetter({
envType: "addon_parent",
}).call(this);
return redefineGetter(this, "childManager", childManager);
}
}
export class DevToolsContextChild extends ExtensionBaseContextChild {
/**
* This DevToolsContextChild represents a devtools-related addon execution
* environment that has access to the devtools API namespace and to the same subset
* of APIs available in a content script execution environment.
*
* @param {ExtensionChild} extension This context's owner.
* @param {object} params
* @param {nsIDOMWindow} params.contentWindow The window where the addon runs.
* @param {string} params.viewType One of "devtools_page" or "devtools_panel".
* @param {object} [params.devtoolsToolboxInfo] This devtools toolbox's information,
* used if viewType is "devtools_page" or "devtools_panel".
* @param {number} [params.tabId] This tab's ID, used if viewType is "tab".
* @param {nsIURI} [params.uri] The URI of the page.
*/
constructor(extension, params) {
super(extension, Object.assign(params, { envType: "devtools_child" }));
this.devtoolsToolboxInfo = params.devtoolsToolboxInfo;
lazy.ExtensionChildDevToolsUtils.initThemeChangeObserver(
params.devtoolsToolboxInfo.themeName,
this
);
this.extension.devtoolsViews.add(this);
}
unload() {
super.unload();
this.extension.devtoolsViews.delete(this);
}
get childManager() {
const childManager = getContextChildManagerGetter({
envType: "devtools_parent",
}).call(this);
return redefineGetter(this, "childManager", childManager);
}
}
export var ExtensionPageChild = {
initialized: false,
// Map<innerWindowId, ExtensionPageContextChild>
extensionContexts: new Map(),
apiManager,
_init() {
if (this.initialized) {
return;
}
this.initialized = true;
Services.obs.addObserver(this, "inner-window-destroyed"); // eslint-ignore-line mozilla/balanced-listeners
},
observe(subject, topic) {
if (topic === "inner-window-destroyed") {
let windowId = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
this.destroyExtensionContext(windowId);
}
},
expectViewLoad(global, viewType) {
promiseEvent(
global,
"DOMContentLoaded",
true,
/** @param {{target: Window|any}} event */
event =>
event.target.location != "about:blank" &&
// Ignore DOMContentLoaded bubbled from child frames:
event.target.defaultView === global.content
).then(() => {
let windowId = getInnerWindowID(global.content);
let context = this.extensionContexts.get(windowId);
// This initializes ChildAPIManager (and creation of ProxyContextParent)
// if they don't exist already at this point.
let childId = context?.childManager.id;
if (viewType === "background") {
global.sendAsyncMessage("Extension:BackgroundViewLoaded", { childId });
}
});
},
/**
* Create a privileged context at initial-document-element-inserted.
*
* @param {ExtensionChild} extension
* The extension for which the context should be created.
* @param {nsIDOMWindow} contentWindow The global of the page.
*/
initExtensionContext(extension, contentWindow) {
this._init();
if (!WebExtensionPolicy.isExtensionProcess) {
throw new Error(
"Cannot create an extension page context in current process"
);
}
let windowId = getInnerWindowID(contentWindow);
let context = this.extensionContexts.get(windowId);
if (context) {
if (context.extension !== extension) {
throw new Error(
"A different extension context already exists for this frame"
);
}
throw new Error(
"An extension context was already initialized for this frame"
);
}
let uri = contentWindow.document.documentURIObject;
let mm = contentWindow.docShell.messageManager;
let data = mm.sendSyncMessage("Extension:GetFrameData")[0];
if (!data) {
let policy = WebExtensionPolicy.getByHostname(uri.host);
// (viewType in particular) should never be void for extension documents.
Cu.reportError(`FrameData missing for ${policy?.id} page ${uri.spec}`);
}
let { viewType, tabId, devtoolsToolboxInfo } = data ?? {};
if (viewType && contentWindow.top === contentWindow) {
ExtensionPageChild.expectViewLoad(mm, viewType);
}
if (devtoolsToolboxInfo) {
context = new DevToolsContextChild(extension, {
viewType,
contentWindow,
uri,
tabId,
devtoolsToolboxInfo,
});
} else {
context = new ExtensionPageContextChild(extension, {
viewType,
contentWindow,
uri,
tabId,
});
}
this.extensionContexts.set(windowId, context);
},
/**
* Close the ExtensionPageContextChild belonging to the given window, if any.
*
* @param {number} windowId The inner window ID of the destroyed context.
*/
destroyExtensionContext(windowId) {
let context = this.extensionContexts.get(windowId);
if (context) {
context.unload();
this.extensionContexts.delete(windowId);
}
},
shutdownExtension(extensionId) {
for (let [windowId, context] of this.extensionContexts) {
if (context.extension.id == extensionId) {
context.shutdown();
this.extensionContexts.delete(windowId);
}
}
},
};