electron/lib/renderer/init.js

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'use strict'
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const events = require('events')
const path = require('path')
const Module = require('module')
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const resolvePromise = Promise.resolve.bind(Promise)
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// We modified the original process.argv to let node.js load the
// init.js, we need to restore it here.
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process.argv.splice(1, 1)
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// Clear search paths.
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require('../common/reset-search-paths')
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// Import common settings.
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require('../common/init')
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var globalPaths = Module.globalPaths
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// Expose public APIs.
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globalPaths.push(path.join(__dirname, 'api', 'exports'))
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// The global variable will be used by ipc for event dispatching
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var v8Util = process.atomBinding('v8_util')
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v8Util.setHiddenValue(global, 'ipc', new events.EventEmitter())
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// Use electron module after everything is ready.
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const electron = require('electron')
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// Call webFrame method.
electron.ipcRenderer.on('ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', (event, method, args) => {
electron.webFrame[method](...args)
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})
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electron.ipcRenderer.on('ELECTRON_INTERNAL_RENDERER_SYNC_WEB_FRAME_METHOD', (event, requestId, method, args) => {
const result = electron.webFrame[method](...args)
event.sender.send(`ELECTRON_INTERNAL_BROWSER_SYNC_WEB_FRAME_RESPONSE_${requestId}`, result)
})
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electron.ipcRenderer.on('ELECTRON_INTERNAL_RENDERER_ASYNC_WEB_FRAME_METHOD', (event, requestId, method, args) => {
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const responseCallback = function (result) {
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resolvePromise(result)
.then((resolvedResult) => {
event.sender.send(`ELECTRON_INTERNAL_BROWSER_ASYNC_WEB_FRAME_RESPONSE_${requestId}`, null, resolvedResult)
})
.catch((resolvedError) => {
event.sender.send(`ELECTRON_INTERNAL_BROWSER_ASYNC_WEB_FRAME_RESPONSE_${requestId}`, resolvedError)
})
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}
args.push(responseCallback)
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electron.webFrame[method](...args)
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})
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// Process command line arguments.
let nodeIntegration = 'false'
let preloadScript = null
let isBackgroundPage = false
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let appPath = null
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for (let arg of process.argv) {
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if (arg.indexOf('--guest-instance-id=') === 0) {
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// This is a guest web view.
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process.guestInstanceId = parseInt(arg.substr(arg.indexOf('=') + 1))
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} else if (arg.indexOf('--opener-id=') === 0) {
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// This is a guest BrowserWindow.
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process.openerId = parseInt(arg.substr(arg.indexOf('=') + 1))
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} else if (arg.indexOf('--node-integration=') === 0) {
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nodeIntegration = arg.substr(arg.indexOf('=') + 1)
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} else if (arg.indexOf('--preload=') === 0) {
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preloadScript = arg.substr(arg.indexOf('=') + 1)
} else if (arg === '--background-page') {
isBackgroundPage = true
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} else if (arg.indexOf('--app-path=') === 0) {
appPath = arg.substr(arg.indexOf('=') + 1)
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}
}
if (window.location.protocol === 'chrome-devtools:') {
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// Override some inspector APIs.
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require('./inspector')
nodeIntegration = 'true'
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} else if (window.location.protocol === 'chrome-extension:') {
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// Add implementations of chrome API.
require('./chrome-api').injectTo(window.location.hostname, isBackgroundPage, window)
nodeIntegration = 'false'
} else if (window.location.protocol === 'chrome:') {
// Disable node integration for chrome UI scheme.
nodeIntegration = 'false'
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} else {
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// Override default web functions.
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require('./override')
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// Inject content scripts.
require('./content-scripts-injector')
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// Load webview tag implementation.
if (nodeIntegration === 'true' && process.guestInstanceId == null) {
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require('./web-view/web-view')
require('./web-view/web-view-attributes')
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}
}
if (nodeIntegration === 'true') {
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// Export node bindings to global.
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global.require = require
global.module = module
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// Set the __filename to the path of html file if it is file: protocol.
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if (window.location.protocol === 'file:') {
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var pathname = process.platform === 'win32' && window.location.pathname[0] === '/' ? window.location.pathname.substr(1) : window.location.pathname
global.__filename = path.normalize(decodeURIComponent(pathname))
global.__dirname = path.dirname(global.__filename)
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// Set module's filename so relative require can work as expected.
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module.filename = global.__filename
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// Also search for module under the html file.
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module.paths = module.paths.concat(Module._nodeModulePaths(global.__dirname))
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} else {
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global.__filename = __filename
global.__dirname = __dirname
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if (appPath) {
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// Search for module under the app directory
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module.paths = module.paths.concat(Module._nodeModulePaths(appPath))
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}
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}
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// Redirect window.onerror to uncaughtException.
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window.onerror = function (message, filename, lineno, colno, error) {
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if (global.process.listeners('uncaughtException').length > 0) {
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global.process.emit('uncaughtException', error)
return true
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} else {
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return false
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}
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}
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} else {
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// Delete Node's symbols after the Environment has been loaded.
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process.once('loaded', function () {
delete global.process
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delete global.Buffer
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delete global.setImmediate
delete global.clearImmediate
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delete global.global
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})
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}
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// Load the script specfied by the "preload" attribute.
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if (preloadScript) {
try {
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require(preloadScript)
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} catch (error) {
console.error('Unable to load preload script: ' + preloadScript)
console.error(error.stack || error.message)
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}
}