117 lines
3.9 KiB
JavaScript
117 lines
3.9 KiB
JavaScript
'use strict'
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/* eslint no-eval: "off" */
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/* global binding, Buffer */
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const events = require('events')
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const { EventEmitter } = events
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process.atomBinding = require('@electron/internal/common/atom-binding-setup')(binding.get, 'renderer')
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// The electron module depends on process.atomBinding
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const electron = require('electron')
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const v8Util = process.atomBinding('v8_util')
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// Expose browserify Buffer as a hidden value. This is used by C++ code to
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// deserialize Buffer instances sent from browser process.
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v8Util.setHiddenValue(global, 'Buffer', Buffer)
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// The `lib/renderer/api/ipc-renderer.js` module looks for the ipc object in the
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// "ipc" hidden value
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v8Util.setHiddenValue(global, 'ipc', new EventEmitter())
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// The process object created by browserify is not an event emitter, fix it so
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// the API is more compatible with non-sandboxed renderers.
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for (const prop of Object.keys(EventEmitter.prototype)) {
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if (process.hasOwnProperty(prop)) {
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delete process[prop]
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}
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}
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Object.setPrototypeOf(process, EventEmitter.prototype)
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const remoteModules = new Set([
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'child_process',
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'fs',
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'os',
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'path'
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])
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const loadedModules = new Map([
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['electron', electron],
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['events', events],
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['timers', require('timers')],
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['url', require('url')]
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])
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const {
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preloadSrc, preloadError, process: processProps
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} = electron.ipcRenderer.sendSync('ELECTRON_BROWSER_SANDBOX_LOAD')
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require('@electron/internal/renderer/web-frame-init')()
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// Pass different process object to the preload script(which should not have
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// access to things like `process.atomBinding`).
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const preloadProcess = new EventEmitter()
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Object.assign(preloadProcess, binding.process)
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Object.assign(preloadProcess, processProps)
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Object.assign(process, binding.process)
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Object.assign(process, processProps)
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process.on('exit', () => preloadProcess.emit('exit'))
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// This is the `require` function that will be visible to the preload script
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function preloadRequire (module) {
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if (loadedModules.has(module)) {
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return loadedModules.get(module)
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}
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if (remoteModules.has(module)) {
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return require(module)
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}
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throw new Error('module not found')
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}
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if (window.location.protocol === 'chrome-devtools:') {
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// Override some inspector APIs.
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require('@electron/internal/renderer/inspector')
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}
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if (binding.guestInstanceId) {
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process.guestInstanceId = parseInt(binding.guestInstanceId)
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}
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if (!process.guestInstanceId && preloadProcess.argv.indexOf('--webview-tag=true') !== -1) {
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// don't allow recursive `<webview>`
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require('@electron/internal/renderer/web-view/web-view')
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require('@electron/internal/renderer/web-view/web-view-attributes')
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}
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// Wrap the script into a function executed in global scope. It won't have
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// access to the current scope, so we'll expose a few objects as arguments:
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//
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// - `require`: The `preloadRequire` function
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// - `process`: The `preloadProcess` object
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// - `Buffer`: Browserify `Buffer` implementation
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// - `global`: The window object, which is aliased to `global` by browserify.
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//
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// Browserify bundles can make use of an external require function as explained
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// in https://github.com/substack/node-browserify#multiple-bundles, so electron
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// apps can use multi-module preload scripts in sandboxed renderers.
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//
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// For example, the user can create a bundle with:
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//
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// $ browserify -x electron preload.js > renderer.js
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//
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// and any `require('electron')` calls in `preload.js` will work as expected
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// since browserify won't try to include `electron` in the bundle, falling back
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// to the `preloadRequire` function above.
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if (preloadSrc) {
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const preloadWrapperSrc = `(function(require, process, Buffer, global, setImmediate, clearImmediate) {
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${preloadSrc}
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})`
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// eval in window scope
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const preloadFn = binding.createPreloadScript(preloadWrapperSrc)
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const { setImmediate, clearImmediate } = require('timers')
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preloadFn(preloadRequire, preloadProcess, Buffer, global, setImmediate, clearImmediate)
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} else if (preloadError) {
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console.error(preloadError.stack)
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}
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