382 lines
14 KiB
TypeScript
382 lines
14 KiB
TypeScript
import { webContents } from 'electron/main';
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import { ipcMainInternal } from '@electron/internal/browser/ipc-main-internal';
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import * as ipcMainUtils from '@electron/internal/browser/ipc-main-internal-utils';
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import { parseWebViewWebPreferences } from '@electron/internal/common/parse-features-string';
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import { syncMethods, asyncMethods, properties } from '@electron/internal/common/web-view-methods';
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import { webViewEvents } from '@electron/internal/common/web-view-events';
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import { serialize } from '@electron/internal/common/type-utils';
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import { IPC_MESSAGES } from '@electron/internal/common/ipc-messages';
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interface GuestInstance {
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elementInstanceId?: number;
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visibilityState?: VisibilityState;
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embedder: Electron.WebContents;
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guest: Electron.WebContents;
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}
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const webViewManager = process._linkedBinding('electron_browser_web_view_manager');
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const eventBinding = process._linkedBinding('electron_browser_event');
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const supportedWebViewEvents = Object.keys(webViewEvents);
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const guestInstances = new Map<number, GuestInstance>();
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const embedderElementsMap = new Map<string, number>();
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function sanitizeOptionsForGuest (options: Record<string, any>) {
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const ret = { ...options };
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// WebContents values can't be sent over IPC.
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delete ret.webContents;
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return ret;
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}
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function makeWebPreferences (embedder: Electron.WebContents, params: Record<string, any>) {
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// parse the 'webpreferences' attribute string, if set
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// this uses the same parsing rules as window.open uses for its features
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const parsedWebPreferences =
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typeof params.webpreferences === 'string'
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? parseWebViewWebPreferences(params.webpreferences)
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: null;
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const webPreferences: Electron.WebPreferences = {
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nodeIntegration: params.nodeintegration != null ? params.nodeintegration : false,
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nodeIntegrationInSubFrames: params.nodeintegrationinsubframes != null ? params.nodeintegrationinsubframes : false,
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plugins: params.plugins,
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zoomFactor: embedder.zoomFactor,
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disablePopups: !params.allowpopups,
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webSecurity: !params.disablewebsecurity,
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enableBlinkFeatures: params.blinkfeatures,
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disableBlinkFeatures: params.disableblinkfeatures,
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...parsedWebPreferences
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};
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if (params.preload) {
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webPreferences.preloadURL = params.preload;
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}
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// Security options that guest will always inherit from embedder
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const inheritedWebPreferences = new Map([
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['contextIsolation', true],
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['javascript', false],
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['nativeWindowOpen', true],
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['nodeIntegration', false],
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['sandbox', true],
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['nodeIntegrationInSubFrames', false],
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['enableWebSQL', false]
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]);
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// Inherit certain option values from embedder
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const lastWebPreferences = embedder.getLastWebPreferences()!;
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for (const [name, value] of inheritedWebPreferences) {
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if (lastWebPreferences[name as keyof Electron.WebPreferences] === value) {
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(webPreferences as any)[name] = value;
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}
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}
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return webPreferences;
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}
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// Create a new guest instance.
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const createGuest = function (embedder: Electron.WebContents, embedderFrameId: number, elementInstanceId: number, params: Record<string, any>) {
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// eslint-disable-next-line no-undef
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const guest = (webContents as typeof ElectronInternal.WebContents).create({
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type: 'webview',
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partition: params.partition,
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embedder
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});
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const guestInstanceId = guest.id;
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guestInstances.set(guestInstanceId, {
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guest,
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embedder
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});
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// Clear the guest from map when it is destroyed.
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guest.once('destroyed', () => {
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if (guestInstances.has(guestInstanceId)) {
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detachGuest(embedder, guestInstanceId);
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}
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});
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// Init guest web view after attached.
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guest.once('did-attach' as any, function (this: Electron.WebContents, event: Electron.Event) {
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params = this.attachParams!;
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delete this.attachParams;
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const previouslyAttached = this.viewInstanceId != null;
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this.viewInstanceId = params.instanceId;
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// Only load URL and set size on first attach
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if (previouslyAttached) {
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return;
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}
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if (params.src) {
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const opts: Electron.LoadURLOptions = {};
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if (params.httpreferrer) {
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opts.httpReferrer = params.httpreferrer;
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}
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if (params.useragent) {
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opts.userAgent = params.useragent;
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}
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this.loadURL(params.src, opts);
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}
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embedder.emit('did-attach-webview', event, guest);
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});
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const sendToEmbedder = (channel: string, ...args: any[]) => {
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if (!embedder.isDestroyed()) {
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embedder._sendInternal(`${channel}-${guest.viewInstanceId}`, ...args);
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}
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};
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// Dispatch events to embedder.
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const fn = function (event: string) {
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guest.on(event as any, function (_, ...args: any[]) {
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sendToEmbedder(IPC_MESSAGES.GUEST_VIEW_INTERNAL_DISPATCH_EVENT, event, ...args);
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});
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};
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for (const event of supportedWebViewEvents) {
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if (event !== 'new-window') {
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fn(event);
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}
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}
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guest.on('new-window', function (event, url, frameName, disposition, options, additionalFeatures, referrer) {
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sendToEmbedder(IPC_MESSAGES.GUEST_VIEW_INTERNAL_DISPATCH_EVENT, 'new-window', url,
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frameName, disposition, sanitizeOptionsForGuest(options),
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additionalFeatures, referrer);
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});
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// Dispatch guest's IPC messages to embedder.
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guest.on('ipc-message-host' as any, function (_: Electron.Event, channel: string, args: any[]) {
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sendToEmbedder(IPC_MESSAGES.GUEST_VIEW_INTERNAL_IPC_MESSAGE, channel, ...args);
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});
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// Notify guest of embedder window visibility when it is ready
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// FIXME Remove once https://github.com/electron/electron/issues/6828 is fixed
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guest.on('dom-ready', function () {
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const guestInstance = guestInstances.get(guestInstanceId);
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if (guestInstance != null && guestInstance.visibilityState != null) {
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guest._sendInternal(IPC_MESSAGES.GUEST_INSTANCE_VISIBILITY_CHANGE, guestInstance.visibilityState);
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}
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});
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if (attachGuest(embedder, embedderFrameId, elementInstanceId, guestInstanceId, params)) {
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return guestInstanceId;
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}
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return -1;
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};
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// Attach the guest to an element of embedder.
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const attachGuest = function (embedder: Electron.WebContents, embedderFrameId: number, elementInstanceId: number, guestInstanceId: number, params: Record<string, any>) {
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// Destroy the old guest when attaching.
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const key = `${embedder.id}-${elementInstanceId}`;
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const oldGuestInstanceId = embedderElementsMap.get(key);
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if (oldGuestInstanceId != null) {
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// Reattachment to the same guest is just a no-op.
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if (oldGuestInstanceId === guestInstanceId) {
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return false;
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}
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const oldGuestInstance = guestInstances.get(oldGuestInstanceId);
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if (oldGuestInstance) {
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oldGuestInstance.guest.detachFromOuterFrame();
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}
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}
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const guestInstance = guestInstances.get(guestInstanceId);
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// If this isn't a valid guest instance then do nothing.
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if (!guestInstance) {
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console.error(new Error(`Guest attach failed: Invalid guestInstanceId ${guestInstanceId}`));
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return false;
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}
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const { guest } = guestInstance;
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if (guest.hostWebContents !== embedder) {
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console.error(new Error(`Guest attach failed: Access denied to guestInstanceId ${guestInstanceId}`));
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return false;
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}
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// If this guest is already attached to an element then remove it
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if (guestInstance.elementInstanceId) {
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const oldKey = `${guestInstance.embedder.id}-${guestInstance.elementInstanceId}`;
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embedderElementsMap.delete(oldKey);
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// Remove guest from embedder if moving across web views
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if (guest.viewInstanceId !== params.instanceId) {
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webViewManager.removeGuest(guestInstance.embedder, guestInstanceId);
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guestInstance.embedder._sendInternal(`${IPC_MESSAGES.GUEST_VIEW_INTERNAL_DESTROY_GUEST}-${guest.viewInstanceId}`);
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}
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}
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const webPreferences = makeWebPreferences(embedder, params);
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const event = eventBinding.createWithSender(embedder);
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embedder.emit('will-attach-webview', event, webPreferences, params);
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if (event.defaultPrevented) {
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if (guest.viewInstanceId == null) guest.viewInstanceId = params.instanceId;
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guest.destroy();
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return false;
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}
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guest.attachParams = params;
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embedderElementsMap.set(key, guestInstanceId);
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guest.setEmbedder(embedder);
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guestInstance.embedder = embedder;
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guestInstance.elementInstanceId = elementInstanceId;
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watchEmbedder(embedder);
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webViewManager.addGuest(guestInstanceId, embedder, guest, webPreferences);
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guest.attachToIframe(embedder, embedderFrameId);
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return true;
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};
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// Remove an guest-embedder relationship.
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const detachGuest = function (embedder: Electron.WebContents, guestInstanceId: number) {
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const guestInstance = guestInstances.get(guestInstanceId);
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if (!guestInstance) return;
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if (embedder !== guestInstance.embedder) {
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return;
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}
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webViewManager.removeGuest(embedder, guestInstanceId);
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guestInstances.delete(guestInstanceId);
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const key = `${embedder.id}-${guestInstance.elementInstanceId}`;
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embedderElementsMap.delete(key);
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};
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// Once an embedder has had a guest attached we watch it for destruction to
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// destroy any remaining guests.
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const watchedEmbedders = new Set<Electron.WebContents>();
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const watchEmbedder = function (embedder: Electron.WebContents) {
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if (watchedEmbedders.has(embedder)) {
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return;
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}
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watchedEmbedders.add(embedder);
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// Forward embedder window visibility change events to guest
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const onVisibilityChange = function (visibilityState: VisibilityState) {
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for (const guestInstance of guestInstances.values()) {
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guestInstance.visibilityState = visibilityState;
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if (guestInstance.embedder === embedder) {
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guestInstance.guest._sendInternal(IPC_MESSAGES.GUEST_INSTANCE_VISIBILITY_CHANGE, visibilityState);
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}
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}
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};
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embedder.on('-window-visibility-change' as any, onVisibilityChange);
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embedder.once('will-destroy' as any, () => {
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// Usually the guestInstances is cleared when guest is destroyed, but it
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// may happen that the embedder gets manually destroyed earlier than guest,
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// and the embedder will be invalid in the usual code path.
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for (const [guestInstanceId, guestInstance] of guestInstances) {
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if (guestInstance.embedder === embedder) {
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detachGuest(embedder, guestInstanceId);
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}
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}
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// Clear the listeners.
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embedder.removeListener('-window-visibility-change' as any, onVisibilityChange);
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watchedEmbedders.delete(embedder);
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});
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};
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const isWebViewTagEnabledCache = new WeakMap();
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const isWebViewTagEnabled = function (contents: Electron.WebContents) {
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if (!isWebViewTagEnabledCache.has(contents)) {
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const webPreferences = contents.getLastWebPreferences() || {};
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isWebViewTagEnabledCache.set(contents, !!webPreferences.webviewTag);
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}
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return isWebViewTagEnabledCache.get(contents);
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};
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const makeSafeHandler = function<Event extends { sender: Electron.WebContents }> (channel: string, handler: (event: Event, ...args: any[]) => any) {
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return (event: Event, ...args: any[]) => {
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if (isWebViewTagEnabled(event.sender)) {
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return handler(event, ...args);
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} else {
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console.error(`<webview> IPC message ${channel} sent by WebContents with <webview> disabled (${event.sender.id})`);
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throw new Error('<webview> disabled');
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}
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};
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};
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const handleMessage = function (channel: string, handler: (event: Electron.IpcMainInvokeEvent, ...args: any[]) => any) {
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ipcMainInternal.handle(channel, makeSafeHandler(channel, handler));
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};
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const handleMessageSync = function (channel: string, handler: (event: ElectronInternal.IpcMainInternalEvent, ...args: any[]) => any) {
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ipcMainUtils.handleSync(channel, makeSafeHandler(channel, handler));
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};
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handleMessage(IPC_MESSAGES.GUEST_VIEW_MANAGER_CREATE_AND_ATTACH_GUEST, function (event, embedderFrameId: number, elementInstanceId: number, params) {
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return createGuest(event.sender, embedderFrameId, elementInstanceId, params);
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});
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handleMessageSync(IPC_MESSAGES.GUEST_VIEW_MANAGER_DETACH_GUEST, function (event, guestInstanceId: number) {
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return detachGuest(event.sender, guestInstanceId);
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});
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// this message is sent by the actual <webview>
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ipcMainInternal.on(IPC_MESSAGES.GUEST_VIEW_MANAGER_FOCUS_CHANGE, function (event: ElectronInternal.IpcMainInternalEvent, focus: boolean) {
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event.sender.emit('-focus-change', {}, focus);
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});
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handleMessage(IPC_MESSAGES.GUEST_VIEW_MANAGER_CALL, function (event, guestInstanceId: number, method: string, args: any[]) {
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const guest = getGuestForWebContents(guestInstanceId, event.sender);
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if (!asyncMethods.has(method)) {
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throw new Error(`Invalid method: ${method}`);
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}
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return (guest as any)[method](...args);
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});
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handleMessageSync(IPC_MESSAGES.GUEST_VIEW_MANAGER_CALL, function (event, guestInstanceId: number, method: string, args: any[]) {
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const guest = getGuestForWebContents(guestInstanceId, event.sender);
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if (!syncMethods.has(method)) {
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throw new Error(`Invalid method: ${method}`);
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}
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return (guest as any)[method](...args);
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});
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handleMessageSync(IPC_MESSAGES.GUEST_VIEW_MANAGER_PROPERTY_GET, function (event, guestInstanceId: number, property: string) {
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const guest = getGuestForWebContents(guestInstanceId, event.sender);
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if (!properties.has(property)) {
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throw new Error(`Invalid property: ${property}`);
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}
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return (guest as any)[property];
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});
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handleMessageSync(IPC_MESSAGES.GUEST_VIEW_MANAGER_PROPERTY_SET, function (event, guestInstanceId: number, property: string, val: any) {
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const guest = getGuestForWebContents(guestInstanceId, event.sender);
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if (!properties.has(property)) {
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throw new Error(`Invalid property: ${property}`);
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}
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(guest as any)[property] = val;
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});
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handleMessage(IPC_MESSAGES.GUEST_VIEW_MANAGER_CAPTURE_PAGE, async function (event, guestInstanceId: number, args: any[]) {
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const guest = getGuestForWebContents(guestInstanceId, event.sender);
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return serialize(await guest.capturePage(...args));
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});
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// Returns WebContents from its guest id hosted in given webContents.
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const getGuestForWebContents = function (guestInstanceId: number, contents: Electron.WebContents) {
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const guestInstance = guestInstances.get(guestInstanceId);
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if (!guestInstance) {
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throw new Error(`Invalid guestInstanceId: ${guestInstanceId}`);
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}
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if (guestInstance.guest.hostWebContents !== contents) {
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throw new Error(`Access denied to guestInstanceId: ${guestInstanceId}`);
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}
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return guestInstance.guest;
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};
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