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- 'use strict'
- const { app, webContents, BrowserWindow } = require('electron')
- const { getAllWebContents } = process.atomBinding('web_contents')
- const renderProcessPreferences = process.atomBinding('render_process_preferences').forAllWebContents()
- const ipcMain = require('@electron/internal/browser/ipc-main-internal')
- const { Buffer } = require('buffer')
- const fs = require('fs')
- const path = require('path')
- const url = require('url')
- // Mapping between extensionId(hostname) and manifest.
- const manifestMap = {} // extensionId => manifest
- const manifestNameMap = {} // name => manifest
- const devToolsExtensionNames = new Set()
- const generateExtensionIdFromName = function (name) {
- return name.replace(/[\W_]+/g, '-').toLowerCase()
- }
- const isWindowOrWebView = function (webContents) {
- const type = webContents.getType()
- return type === 'window' || type === 'webview'
- }
- // Create or get manifest object from |srcDirectory|.
- const getManifestFromPath = function (srcDirectory) {
- let manifest
- let manifestContent
- try {
- manifestContent = fs.readFileSync(path.join(srcDirectory, 'manifest.json'))
- } catch (readError) {
- console.warn(`Reading ${path.join(srcDirectory, 'manifest.json')} failed.`)
- console.warn(readError.stack || readError)
- throw readError
- }
- try {
- manifest = JSON.parse(manifestContent)
- } catch (parseError) {
- console.warn(`Parsing ${path.join(srcDirectory, 'manifest.json')} failed.`)
- console.warn(parseError.stack || parseError)
- throw parseError
- }
- if (!manifestNameMap[manifest.name]) {
- const extensionId = generateExtensionIdFromName(manifest.name)
- manifestMap[extensionId] = manifestNameMap[manifest.name] = manifest
- Object.assign(manifest, {
- srcDirectory: srcDirectory,
- extensionId: extensionId,
- // We can not use 'file://' directly because all resources in the extension
- // will be treated as relative to the root in Chrome.
- startPage: url.format({
- protocol: 'chrome-extension',
- slashes: true,
- hostname: extensionId,
- pathname: manifest.devtools_page
- })
- })
- return manifest
- } else if (manifest && manifest.name) {
- console.warn(`Attempted to load extension "${manifest.name}" that has already been loaded.`)
- return manifest
- }
- }
- // Manage the background pages.
- const backgroundPages = {}
- const startBackgroundPages = function (manifest) {
- if (backgroundPages[manifest.extensionId] || !manifest.background) return
- let html
- let name
- if (manifest.background.page) {
- name = manifest.background.page
- html = fs.readFileSync(path.join(manifest.srcDirectory, manifest.background.page))
- } else {
- name = '_generated_background_page.html'
- const scripts = manifest.background.scripts.map((name) => {
- return `<script src="${name}"></script>`
- }).join('')
- html = Buffer.from(`<html><body>${scripts}</body></html>`)
- }
- const contents = webContents.create({
- partition: 'persist:__chrome_extension',
- isBackgroundPage: true,
- commandLineSwitches: ['--background-page']
- })
- backgroundPages[manifest.extensionId] = { html: html, webContents: contents, name: name }
- contents.loadURL(url.format({
- protocol: 'chrome-extension',
- slashes: true,
- hostname: manifest.extensionId,
- pathname: name
- }))
- }
- const removeBackgroundPages = function (manifest) {
- if (!backgroundPages[manifest.extensionId]) return
- backgroundPages[manifest.extensionId].webContents.destroy()
- delete backgroundPages[manifest.extensionId]
- }
- const sendToBackgroundPages = function (...args) {
- for (const page of Object.values(backgroundPages)) {
- page.webContents._sendInternalToAll(...args)
- }
- }
- // Dispatch web contents events to Chrome APIs
- const hookWebContentsEvents = function (webContents) {
- const tabId = webContents.id
- sendToBackgroundPages('CHROME_TABS_ONCREATED')
- webContents.on('will-navigate', (event, url) => {
- sendToBackgroundPages('CHROME_WEBNAVIGATION_ONBEFORENAVIGATE', {
- frameId: 0,
- parentFrameId: -1,
- processId: webContents.getProcessId(),
- tabId: tabId,
- timeStamp: Date.now(),
- url: url
- })
- })
- webContents.on('did-navigate', (event, url) => {
- sendToBackgroundPages('CHROME_WEBNAVIGATION_ONCOMPLETED', {
- frameId: 0,
- parentFrameId: -1,
- processId: webContents.getProcessId(),
- tabId: tabId,
- timeStamp: Date.now(),
- url: url
- })
- })
- webContents.once('destroyed', () => {
- sendToBackgroundPages('CHROME_TABS_ONREMOVED', tabId)
- })
- }
- // Handle the chrome.* API messages.
- let nextId = 0
- ipcMain.on('CHROME_RUNTIME_CONNECT', function (event, extensionId, connectInfo) {
- const page = backgroundPages[extensionId]
- if (!page) {
- console.error(`Connect to unknown extension ${extensionId}`)
- return
- }
- const portId = ++nextId
- event.returnValue = { tabId: page.webContents.id, portId: portId }
- event.sender.once('render-view-deleted', () => {
- if (page.webContents.isDestroyed()) return
- page.webContents._sendInternalToAll(`CHROME_PORT_DISCONNECT_${portId}`)
- })
- page.webContents._sendInternalToAll(`CHROME_RUNTIME_ONCONNECT_${extensionId}`, event.sender.id, portId, connectInfo)
- })
- ipcMain.on('CHROME_I18N_MANIFEST', function (event, extensionId) {
- event.returnValue = manifestMap[extensionId]
- })
- let resultID = 1
- ipcMain.on('CHROME_RUNTIME_SENDMESSAGE', function (event, extensionId, message, originResultID) {
- const page = backgroundPages[extensionId]
- if (!page) {
- console.error(`Connect to unknown extension ${extensionId}`)
- return
- }
- page.webContents._sendInternalToAll(`CHROME_RUNTIME_ONMESSAGE_${extensionId}`, event.sender.id, message, resultID)
- ipcMain.once(`CHROME_RUNTIME_ONMESSAGE_RESULT_${resultID}`, (event, result) => {
- event.sender._sendInternal(`CHROME_RUNTIME_SENDMESSAGE_RESULT_${originResultID}`, result)
- })
- resultID++
- })
- ipcMain.on('CHROME_TABS_SEND_MESSAGE', function (event, tabId, extensionId, isBackgroundPage, message, originResultID) {
- const contents = webContents.fromId(tabId)
- if (!contents) {
- console.error(`Sending message to unknown tab ${tabId}`)
- return
- }
- const senderTabId = isBackgroundPage ? null : event.sender.id
- contents._sendInternalToAll(`CHROME_RUNTIME_ONMESSAGE_${extensionId}`, senderTabId, message, resultID)
- ipcMain.once(`CHROME_RUNTIME_ONMESSAGE_RESULT_${resultID}`, (event, result) => {
- event.sender._sendInternal(`CHROME_TABS_SEND_MESSAGE_RESULT_${originResultID}`, result)
- })
- resultID++
- })
- const isChromeExtension = function (pageURL) {
- const { protocol } = url.parse(pageURL)
- return protocol === 'chrome-extension:'
- }
- ipcMain.on('CHROME_TABS_EXECUTESCRIPT', function (event, requestId, tabId, extensionId, details) {
- const pageURL = event.sender._getURL()
- if (!isChromeExtension(pageURL)) {
- console.error(`Blocked ${pageURL} from calling chrome.tabs.executeScript()`)
- return
- }
- const contents = webContents.fromId(tabId)
- if (!contents) {
- console.error(`Sending message to unknown tab ${tabId}`)
- return
- }
- let code, url
- if (details.file) {
- const manifest = manifestMap[extensionId]
- code = String(fs.readFileSync(path.join(manifest.srcDirectory, details.file)))
- url = `chrome-extension://${extensionId}${details.file}`
- } else {
- code = details.code
- url = `chrome-extension://${extensionId}/${String(Math.random()).substr(2, 8)}.js`
- }
- contents._sendInternal('CHROME_TABS_EXECUTESCRIPT', event.sender.id, requestId, extensionId, url, code)
- })
- // Transfer the content scripts to renderer.
- const contentScripts = {}
- const injectContentScripts = function (manifest) {
- if (contentScripts[manifest.name] || !manifest.content_scripts) return
- const readArrayOfFiles = function (relativePath) {
- return {
- url: `chrome-extension://${manifest.extensionId}/${relativePath}`,
- code: String(fs.readFileSync(path.join(manifest.srcDirectory, relativePath)))
- }
- }
- const contentScriptToEntry = function (script) {
- return {
- matches: script.matches,
- js: script.js ? script.js.map(readArrayOfFiles) : [],
- css: script.css ? script.css.map(readArrayOfFiles) : [],
- runAt: script.run_at || 'document_idle'
- }
- }
- try {
- const entry = {
- extensionId: manifest.extensionId,
- contentScripts: manifest.content_scripts.map(contentScriptToEntry)
- }
- contentScripts[manifest.name] = renderProcessPreferences.addEntry(entry)
- } catch (e) {
- console.error('Failed to read content scripts', e)
- }
- }
- const removeContentScripts = function (manifest) {
- if (!contentScripts[manifest.name]) return
- renderProcessPreferences.removeEntry(contentScripts[manifest.name])
- delete contentScripts[manifest.name]
- }
- // Transfer the |manifest| to a format that can be recognized by the
- // |DevToolsAPI.addExtensions|.
- const manifestToExtensionInfo = function (manifest) {
- return {
- startPage: manifest.startPage,
- srcDirectory: manifest.srcDirectory,
- name: manifest.name,
- exposeExperimentalAPIs: true
- }
- }
- // Load the extensions for the window.
- const loadExtension = function (manifest) {
- startBackgroundPages(manifest)
- injectContentScripts(manifest)
- }
- const loadDevToolsExtensions = function (win, manifests) {
- if (!win.devToolsWebContents) return
- manifests.forEach(loadExtension)
- const extensionInfoArray = manifests.map(manifestToExtensionInfo)
- extensionInfoArray.forEach((extension) => {
- win.devToolsWebContents._grantOriginAccess(extension.startPage)
- })
- win.devToolsWebContents.executeJavaScript(`DevToolsAPI.addExtensions(${JSON.stringify(extensionInfoArray)})`)
- }
- app.on('web-contents-created', function (event, webContents) {
- if (!isWindowOrWebView(webContents)) return
- hookWebContentsEvents(webContents)
- webContents.on('devtools-opened', function () {
- loadDevToolsExtensions(webContents, Object.values(manifestMap))
- })
- })
- // The chrome-extension: can map a extension URL request to real file path.
- const chromeExtensionHandler = function (request, callback) {
- const parsed = url.parse(request.url)
- if (!parsed.hostname || !parsed.path) return callback()
- const manifest = manifestMap[parsed.hostname]
- if (!manifest) return callback()
- const page = backgroundPages[parsed.hostname]
- if (page && parsed.path === `/${page.name}`) {
- // Disabled due to false positive in StandardJS
- // eslint-disable-next-line standard/no-callback-literal
- return callback({
- mimeType: 'text/html',
- data: page.html
- })
- }
- fs.readFile(path.join(manifest.srcDirectory, parsed.path), function (err, content) {
- if (err) {
- // Disabled due to false positive in StandardJS
- // eslint-disable-next-line standard/no-callback-literal
- return callback(-6) // FILE_NOT_FOUND
- } else {
- return callback(content)
- }
- })
- }
- app.on('session-created', function (ses) {
- ses.protocol.registerBufferProtocol('chrome-extension', chromeExtensionHandler, function (error) {
- if (error) {
- console.error(`Unable to register chrome-extension protocol: ${error}`)
- }
- })
- })
- // The persistent path of "DevTools Extensions" preference file.
- let loadedDevToolsExtensionsPath = null
- app.on('will-quit', function () {
- try {
- const loadedDevToolsExtensions = Array.from(devToolsExtensionNames)
- .map(name => manifestNameMap[name].srcDirectory)
- if (loadedDevToolsExtensions.length > 0) {
- try {
- fs.mkdirSync(path.dirname(loadedDevToolsExtensionsPath))
- } catch (error) {
- // Ignore error
- }
- fs.writeFileSync(loadedDevToolsExtensionsPath, JSON.stringify(loadedDevToolsExtensions))
- } else {
- fs.unlinkSync(loadedDevToolsExtensionsPath)
- }
- } catch (error) {
- // Ignore error
- }
- })
- // We can not use protocol or BrowserWindow until app is ready.
- app.once('ready', function () {
- // The public API to add/remove extensions.
- BrowserWindow.addExtension = function (srcDirectory) {
- const manifest = getManifestFromPath(srcDirectory)
- if (manifest) {
- loadExtension(manifest)
- for (const webContents of getAllWebContents()) {
- if (isWindowOrWebView(webContents)) {
- loadDevToolsExtensions(webContents, [manifest])
- }
- }
- return manifest.name
- }
- }
- BrowserWindow.removeExtension = function (name) {
- const manifest = manifestNameMap[name]
- if (!manifest) return
- removeBackgroundPages(manifest)
- removeContentScripts(manifest)
- delete manifestMap[manifest.extensionId]
- delete manifestNameMap[name]
- }
- BrowserWindow.getExtensions = function () {
- const extensions = {}
- Object.keys(manifestNameMap).forEach(function (name) {
- const manifest = manifestNameMap[name]
- extensions[name] = { name: manifest.name, version: manifest.version }
- })
- return extensions
- }
- BrowserWindow.addDevToolsExtension = function (srcDirectory) {
- const manifestName = BrowserWindow.addExtension(srcDirectory)
- if (manifestName) {
- devToolsExtensionNames.add(manifestName)
- }
- return manifestName
- }
- BrowserWindow.removeDevToolsExtension = function (name) {
- BrowserWindow.removeExtension(name)
- devToolsExtensionNames.delete(name)
- }
- BrowserWindow.getDevToolsExtensions = function () {
- const extensions = BrowserWindow.getExtensions()
- const devExtensions = {}
- Array.from(devToolsExtensionNames).forEach(function (name) {
- if (!extensions[name]) return
- devExtensions[name] = extensions[name]
- })
- return devExtensions
- }
- // Load persisted extensions.
- loadedDevToolsExtensionsPath = path.join(app.getPath('userData'), 'DevTools Extensions')
- try {
- const loadedDevToolsExtensions = JSON.parse(fs.readFileSync(loadedDevToolsExtensionsPath))
- if (Array.isArray(loadedDevToolsExtensions)) {
- for (const srcDirectory of loadedDevToolsExtensions) {
- // Start background pages and set content scripts.
- BrowserWindow.addDevToolsExtension(srcDirectory)
- }
- }
- } catch (error) {
- if (process.env.ELECTRON_ENABLE_LOGGING && error.code !== 'ENOENT') {
- console.error('Failed to load browser extensions from directory:', loadedDevToolsExtensionsPath)
- console.error(error)
- }
- }
- })
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