/
init.ts
195 lines (166 loc) · 6.92 KB
/
init.ts
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/* eslint no-eval: "off" */
/* global binding */
import * as events from 'events';
import { IPC_MESSAGES } from '@electron/internal/common/ipc-messages';
const { EventEmitter } = events;
process._linkedBinding = binding.get;
const v8Util = process._linkedBinding('electron_common_v8_util');
// Expose Buffer shim as a hidden value. This is used by C++ code to
// deserialize Buffer instances sent from browser process.
v8Util.setHiddenValue(global, 'Buffer', Buffer);
// The process object created by webpack is not an event emitter, fix it so
// the API is more compatible with non-sandboxed renderers.
for (const prop of Object.keys(EventEmitter.prototype) as (keyof typeof process)[]) {
if (Object.prototype.hasOwnProperty.call(process, prop)) {
delete process[prop];
}
}
Object.setPrototypeOf(process, EventEmitter.prototype);
const { ipcRendererInternal } = require('@electron/internal/renderer/ipc-renderer-internal');
const ipcRendererUtils = require('@electron/internal/renderer/ipc-renderer-internal-utils');
const { preloadScripts, process: processProps } = ipcRendererUtils.invokeSync(IPC_MESSAGES.BROWSER_SANDBOX_LOAD);
const electron = require('electron');
const loadedModules = new Map<string, any>([
['electron', electron],
['electron/common', electron],
['electron/renderer', electron],
['events', events]
]);
const loadableModules = new Map<string, Function>([
['timers', () => require('timers')],
['url', () => require('url')]
]);
// ElectronApiServiceImpl will look for the "ipcNative" hidden object when
// invoking the 'onMessage' callback.
v8Util.setHiddenValue(global, 'ipcNative', {
onMessage (internal: boolean, channel: string, ports: MessagePort[], args: any[], senderId: number) {
if (internal && senderId !== 0) {
console.error(`Message ${channel} sent by unexpected WebContents (${senderId})`);
return;
}
const sender = internal ? ipcRendererInternal : electron.ipcRenderer;
sender.emit(channel, { sender, senderId, ports }, ...args);
}
});
// ElectronSandboxedRendererClient will look for the "lifecycle" hidden object when
v8Util.setHiddenValue(global, 'lifecycle', {
onLoaded () {
(process as events.EventEmitter).emit('loaded');
},
onExit () {
(process as events.EventEmitter).emit('exit');
},
onDocumentStart () {
(process as events.EventEmitter).emit('document-start');
},
onDocumentEnd () {
(process as events.EventEmitter).emit('document-end');
}
});
const { webFrameInit } = require('@electron/internal/renderer/web-frame-init');
webFrameInit();
// Pass different process object to the preload script.
const preloadProcess: NodeJS.Process = new EventEmitter() as any;
Object.assign(preloadProcess, binding.process);
Object.assign(preloadProcess, processProps);
Object.assign(process, binding.process);
Object.assign(process, processProps);
Object.defineProperty(preloadProcess, 'noDeprecation', {
get () {
return process.noDeprecation;
},
set (value) {
process.noDeprecation = value;
}
});
// Expose process.contextId
const contextId = v8Util.getHiddenValue<string>(global, 'contextId');
Object.defineProperty(preloadProcess, 'contextId', { get: () => contextId });
process.on('loaded', () => (preloadProcess as events.EventEmitter).emit('loaded'));
process.on('exit', () => (preloadProcess as events.EventEmitter).emit('exit'));
(process as events.EventEmitter).on('document-start', () => (preloadProcess as events.EventEmitter).emit('document-start'));
(process as events.EventEmitter).on('document-end', () => (preloadProcess as events.EventEmitter).emit('document-end'));
// This is the `require` function that will be visible to the preload script
function preloadRequire (module: string) {
if (loadedModules.has(module)) {
return loadedModules.get(module);
}
if (loadableModules.has(module)) {
const loadedModule = loadableModules.get(module)!();
loadedModules.set(module, loadedModule);
return loadedModule;
}
throw new Error(`module not found: ${module}`);
}
// Process command line arguments.
const { hasSwitch } = process._linkedBinding('electron_common_command_line');
const { getWebPreference } = process._linkedBinding('electron_renderer_web_frame');
// Similar to nodes --expose-internals flag, this exposes _linkedBinding so
// that tests can call it to get access to some test only bindings
if (hasSwitch('unsafely-expose-electron-internals-for-testing')) {
preloadProcess._linkedBinding = process._linkedBinding;
}
const contextIsolation = getWebPreference(window, 'contextIsolation');
const webviewTag = getWebPreference(window, 'webviewTag');
const isHiddenPage = getWebPreference(window, 'hiddenPage');
const rendererProcessReuseEnabled = getWebPreference(window, 'disableElectronSiteInstanceOverrides');
const usesNativeWindowOpen = true;
const guestInstanceId = getWebPreference(window, 'guestInstanceId') || null;
const openerId = getWebPreference(window, 'openerId') || null;
switch (window.location.protocol) {
case 'devtools:': {
// Override some inspector APIs.
require('@electron/internal/renderer/inspector');
break;
}
case 'chrome-extension:': {
break;
}
case 'chrome:': {
break;
}
default: {
// Override default web functions.
const { windowSetup } = require('@electron/internal/renderer/window-setup');
windowSetup(guestInstanceId, openerId, isHiddenPage, usesNativeWindowOpen, rendererProcessReuseEnabled);
}
}
// Load webview tag implementation.
if (process.isMainFrame) {
const { webViewInit } = require('@electron/internal/renderer/web-view/web-view-init');
webViewInit(contextIsolation, webviewTag, guestInstanceId);
}
// Wrap the script into a function executed in global scope. It won't have
// access to the current scope, so we'll expose a few objects as arguments:
//
// - `require`: The `preloadRequire` function
// - `process`: The `preloadProcess` object
// - `Buffer`: Shim of `Buffer` implementation
// - `global`: The window object, which is aliased to `global` by webpack.
function runPreloadScript (preloadSrc: string) {
const preloadWrapperSrc = `(function(require, process, Buffer, global, setImmediate, clearImmediate, exports) {
${preloadSrc}
})`;
// eval in window scope
const preloadFn = binding.createPreloadScript(preloadWrapperSrc);
const { setImmediate, clearImmediate } = require('timers');
preloadFn(preloadRequire, preloadProcess, Buffer, global, setImmediate, clearImmediate, {});
}
for (const { preloadPath, preloadSrc, preloadError } of preloadScripts) {
try {
if (preloadSrc) {
runPreloadScript(preloadSrc);
} else if (preloadError) {
throw preloadError;
}
} catch (error) {
console.error(`Unable to load preload script: ${preloadPath}`);
console.error(error);
ipcRendererInternal.send(IPC_MESSAGES.BROWSER_PRELOAD_ERROR, preloadPath, error);
}
}
// Warn about security issues
if (process.isMainFrame) {
const { securityWarnings } = require('@electron/internal/renderer/security-warnings');
securityWarnings();
}