const {app, ipcMain, protocol, webContents, BrowserWindow} = require('electron') const {getAllWebContents} = process.atomBinding('web_contents') const renderProcessPreferences = process.atomBinding('render_process_preferences').forAllBrowserWindow() const fs = require('fs') const path = require('path') const url = require('url') // TODO(zcbenz): Remove this when we have Object.values(). const objectValues = function (object) { return Object.keys(object).map(function (key) { return object[key] }) } // Mapping between extensionId(hostname) and manifest. const manifestMap = {} // extensionId => manifest const manifestNameMap = {} // name => manifest const generateExtensionIdFromName = function (name) { return name.replace(/[\W_]+/g, '-').toLowerCase() } // Create or get manifest object from |srcDirectory|. const getManifestFromPath = function (srcDirectory) { let manifest try { manifest = JSON.parse(fs.readFileSync(path.join(srcDirectory, 'manifest.json'))) } catch (err) { console.warn(`Attempted to load extension from ${srcDirectory}, but parsing the manifest failed.`) console.warn('Error encountered:', err) } if (!manifestNameMap[manifest.name]) { const extensionId = generateExtensionIdFromName(manifest.name) manifestMap[extensionId] = manifestNameMap[manifest.name] = manifest Object.assign(manifest, { srcDirectory: srcDirectory, extensionId: extensionId, // We can not use 'file://' directly because all resources in the extension // will be treated as relative to the root in Chrome. startPage: url.format({ protocol: 'chrome-extension', slashes: true, hostname: extensionId, pathname: manifest.devtools_page }) }) return manifest } else if (manifest && manifest.name) { console.warn(`Attempted to load extension "${manifest.name}", but extension was already loaded!`) } } // Manage the background pages. const backgroundPages = {} const startBackgroundPages = function (manifest) { if (backgroundPages[manifest.extensionId] || !manifest.background) return const scripts = manifest.background.scripts.map((name) => { return `` }).join('') const html = new Buffer(`${scripts}`) const contents = webContents.create({ commandLineSwitches: ['--background-page'] }) backgroundPages[manifest.extensionId] = { html: html, webContents: contents } contents.loadURL(url.format({ protocol: 'chrome-extension', slashes: true, hostname: manifest.extensionId, pathname: '_generated_background_page.html' })) } const removeBackgroundPages = function (manifest) { if (!backgroundPages[manifest.extensionId]) return backgroundPages[manifest.extensionId].webContents.destroy() delete backgroundPages[manifest.extensionId] } // Dispatch tabs events. const hookWindowForTabEvents = function (webContents) { const tabId = webContents.id for (const page of objectValues(backgroundPages)) { page.webContents.sendToAll('CHROME_TABS_ONCREATED', tabId) } webContents.once('destroyed', () => { for (const page of objectValues(backgroundPages)) { page.webContents.sendToAll('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 unkown extension ${extensionId}`) return } const portId = ++nextId event.returnValue = {tabId: page.webContents.id, portId: portId} event.sender.once('render-view-deleted', () => { if (page.webContents.isDestroyed()) return page.webContents.sendToAll(`CHROME_PORT_DISCONNECT_${portId}`) }) page.webContents.sendToAll(`CHROME_RUNTIME_ONCONNECT_${extensionId}`, event.sender.id, portId, connectInfo) }) ipcMain.on('CHROME_RUNTIME_SENDMESSAGE', function (event, extensionId, message) { const page = backgroundPages[extensionId] if (!page) { console.error(`Connect to unkown extension ${extensionId}`) return } page.webContents.sendToAll(`CHROME_RUNTIME_ONMESSAGE_${extensionId}`, event.sender.id, message) }) ipcMain.on('CHROME_TABS_SEND_MESSAGE', function (event, tabId, extensionId, isBackgroundPage, message) { const contents = webContents.fromId(tabId) if (!contents) { console.error(`Sending message to unkown tab ${tabId}`) return } const senderTabId = isBackgroundPage ? null : event.sender.id contents.sendToAll(`CHROME_RUNTIME_ONMESSAGE_${extensionId}`, senderTabId, message) }) ipcMain.on('CHROME_TABS_EXECUTESCRIPT', function (event, requestId, tabId, extensionId, details) { const contents = webContents.fromId(tabId) if (!contents) { console.error(`Sending message to unkown 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}/${String(Math.random()).substr(2, 8)}.js` } contents.send('CHROME_TABS_EXECUTESCRIPT', event.sender.id, requestId, extensionId, url, code) }) // Transfer the content scripts to renderer. const contentScripts = {} const injectContentScripts = function (manifest) { if (contentScripts[manifest.name] || !manifest.content_scripts) return const readArrayOfFiles = function (relativePath) { return { url: `chrome-extension://${manifest.extensionId}/${relativePath}`, code: String(fs.readFileSync(path.join(manifest.srcDirectory, relativePath))) } } const contentScriptToEntry = function (script) { return { matches: script.matches, js: script.js.map(readArrayOfFiles), runAt: script.run_at || 'document_idle' } } try { const entry = { extensionId: manifest.extensionId, contentScripts: manifest.content_scripts.map(contentScriptToEntry) } contentScripts[manifest.name] = renderProcessPreferences.addEntry(entry) } catch (e) { console.error('Failed to read content scripts', e) } } const removeContentScripts = function (manifest) { if (!contentScripts[manifest.name]) return renderProcessPreferences.removeEntry(contentScripts[manifest.name]) delete contentScripts[manifest.name] } // Transfer the |manifest| to a format that can be recognized by the // |DevToolsAPI.addExtensions|. const manifestToExtensionInfo = function (manifest) { return { startPage: manifest.startPage, srcDirectory: manifest.srcDirectory, name: manifest.name, exposeExperimentalAPIs: true } } // Load the extensions for the window. const loadExtension = function (manifest) { startBackgroundPages(manifest) injectContentScripts(manifest) } const loadDevToolsExtensions = function (win, manifests) { if (!win.devToolsWebContents) return manifests.forEach(loadExtension) const extensionInfoArray = manifests.map(manifestToExtensionInfo) win.devToolsWebContents.executeJavaScript(`DevToolsAPI.addExtensions(${JSON.stringify(extensionInfoArray)})`) } webContents.on('web-contents-created', function (webContents) { hookWindowForTabEvents(webContents) webContents.on('devtools-opened', function () { loadDevToolsExtensions(webContents, objectValues(manifestMap)) }) }) // The persistent path of "DevTools Extensions" preference file. let loadedExtensionsPath = null app.on('will-quit', function () { try { const loadedExtensions = objectValues(manifestMap).map(function (manifest) { return manifest.srcDirectory }) if (loadedExtensions.length > 0) { try { fs.mkdirSync(path.dirname(loadedExtensionsPath)) } catch (error) { // Ignore error } fs.writeFileSync(loadedExtensionsPath, JSON.stringify(loadedExtensions)) } else { fs.unlinkSync(loadedExtensionsPath) } } catch (error) { // Ignore error } }) // We can not use protocol or BrowserWindow until app is ready. app.once('ready', function () { // 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() if (parsed.path === '/_generated_background_page.html' && backgroundPages[parsed.hostname]) { return callback({ mimeType: 'text/html', data: backgroundPages[parsed.hostname].html }) } fs.readFile(path.join(manifest.srcDirectory, parsed.path), function (err, content) { if (err) { return callback(-6) // FILE_NOT_FOUND } else { return callback(content) } }) } protocol.registerBufferProtocol('chrome-extension', chromeExtensionHandler, function (error) { if (error) { console.error(`Unable to register chrome-extension protocol: ${error}`) } }) // Load persisted extensions. loadedExtensionsPath = path.join(app.getPath('userData'), 'DevTools Extensions') try { const loadedExtensions = JSON.parse(fs.readFileSync(loadedExtensionsPath)) if (Array.isArray(loadedExtensions)) { for (const srcDirectory of loadedExtensions) { // Start background pages and set content scripts. const manifest = getManifestFromPath(srcDirectory) loadExtension(manifest) } } } catch (error) { // Ignore error } // The public API to add/remove extensions. BrowserWindow.addDevToolsExtension = function (srcDirectory) { const manifest = getManifestFromPath(srcDirectory) if (manifest) { for (const webContents of getAllWebContents()) { loadDevToolsExtensions(webContents, [manifest]) } return manifest.name } } BrowserWindow.removeDevToolsExtension = function (name) { const manifest = manifestNameMap[name] if (!manifest) return removeBackgroundPages(manifest) removeContentScripts(manifest) delete manifestMap[manifest.extensionId] delete manifestNameMap[name] } })