webview-spec.ts

import * as path from 'path'
import { BrowserWindow, session, ipcMain, app, WebContents } from 'electron'
import { closeAllWindows } from './window-helpers'
import { emittedOnce } from './events-helpers'
import { expect } from 'chai'

async function loadWebView(w: WebContents, attributes: Record<string, string>): Promise<void> {
  await w.executeJavaScript(`
    new Promise((resolve, reject) => {
      const webview = new WebView()
      for (const [k, v] of Object.entries(${JSON.stringify(attributes)})) {
        webview.setAttribute(k, v)
      }
      document.body.appendChild(webview)
      webview.addEventListener('did-finish-load', () => {
        resolve()
      })
    })
  `)
}

describe('<webview> tag', function () {
  const fixtures = path.join(__dirname, '..', 'spec', 'fixtures')

  afterEach(closeAllWindows)

  it('works without script tag in page', async () => {
    const w = new BrowserWindow({
      show: false,
      webPreferences: {
        webviewTag: true,
        nodeIntegration: true
      }
    })
    w.loadFile(path.join(fixtures, 'pages', 'webview-no-script.html'))
    await emittedOnce(ipcMain, 'pong')
  })

  it('works with sandbox', async () => {
    const w = new BrowserWindow({
      show: false,
      webPreferences: {
        webviewTag: true,
        nodeIntegration: true,
        sandbox: true
      }
    })
    w.loadFile(path.join(fixtures, 'pages', 'webview-isolated.html'))
    await emittedOnce(ipcMain, 'pong')
  })

  it('works with contextIsolation', async () => {
    const w = new BrowserWindow({
      show: false,
      webPreferences: {
        webviewTag: true,
        nodeIntegration: true,
        contextIsolation: true
      }
    })
    w.loadFile(path.join(fixtures, 'pages', 'webview-isolated.html'))
    await emittedOnce(ipcMain, 'pong')
  })

  it('works with contextIsolation + sandbox', async () => {
    const w = new BrowserWindow({
      show: false,
      webPreferences: {
        webviewTag: true,
        nodeIntegration: true,
        contextIsolation: true,
        sandbox: true
      }
    })
    w.loadFile(path.join(fixtures, 'pages', 'webview-isolated.html'))
    await emittedOnce(ipcMain, 'pong')
  })

  it('is disabled by default', async () => {
    const w = new BrowserWindow({
      show: false,
      webPreferences: {
        preload: path.join(fixtures, 'module', 'preload-webview.js'),
        nodeIntegration: true
      }
    })

    const webview = emittedOnce(ipcMain, 'webview')
    w.loadFile(path.join(fixtures, 'pages', 'webview-no-script.html'))
    const [, type] = await webview

    expect(type).to.equal('undefined', 'WebView still exists')
  })

  // FIXME(deepak1556): Ch69 follow up.
  xdescribe('document.visibilityState/hidden', () => {
    afterEach(() => {
      ipcMain.removeAllListeners('pong')
    })

    it('updates when the window is shown after the ready-to-show event', async () => {
      const w = new BrowserWindow({ show: false })
      const readyToShowSignal = emittedOnce(w, 'ready-to-show')
      const pongSignal1 = emittedOnce(ipcMain, 'pong')
      w.loadFile(path.join(fixtures, 'pages', 'webview-visibilitychange.html'))
      await pongSignal1
      const pongSignal2 = emittedOnce(ipcMain, 'pong')
      await readyToShowSignal
      w.show()

      const [, visibilityState, hidden] = await pongSignal2
      expect(visibilityState).to.equal('visible')
      expect(hidden).to.be.false()
    })

    it('inherits the parent window visibility state and receives visibilitychange events', async () => {
      const w = new BrowserWindow({ show: false })
      w.loadFile(path.join(fixtures, 'pages', 'webview-visibilitychange.html'))
      const [, visibilityState, hidden] = await emittedOnce(ipcMain, 'pong')
      expect(visibilityState).to.equal('hidden')
      expect(hidden).to.be.true()

      // We have to start waiting for the event
      // before we ask the webContents to resize.
      const getResponse = emittedOnce(ipcMain, 'pong')
      w.webContents.emit('-window-visibility-change', 'visible')

      return getResponse.then(([, visibilityState, hidden]) => {
        expect(visibilityState).to.equal('visible')
        expect(hidden).to.be.false()
      })
    })
  })

  describe('did-attach-webview event', () => {
    it('is emitted when a webview has been attached', async () => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          webviewTag: true,
          nodeIntegration: true
        }
      })
      const didAttachWebview = emittedOnce(w.webContents, 'did-attach-webview')
      const webviewDomReady = emittedOnce(ipcMain, 'webview-dom-ready')
      w.loadFile(path.join(fixtures, 'pages', 'webview-did-attach-event.html'))

      const [, webContents] = await didAttachWebview
      const [, id] = await webviewDomReady
      expect(webContents.id).to.equal(id)
    })
  })

  it('loads devtools extensions registered on the parent window', async () => {
    const w = new BrowserWindow({
      show: false,
      webPreferences: {
        webviewTag: true,
        nodeIntegration: true
      }
    })
    BrowserWindow.removeDevToolsExtension('foo')

    const extensionPath = path.join(fixtures, 'devtools-extensions', 'foo')
    BrowserWindow.addDevToolsExtension(extensionPath)

    w.loadFile(path.join(fixtures, 'pages', 'webview-devtools.html'))

    const [, { runtimeId, tabId }] = await emittedOnce(ipcMain, 'answer')
    expect(runtimeId).to.equal('foo')
    expect(tabId).to.be.not.equal(w.webContents.id)
  })

  describe('zoom behavior', () => {
    const zoomScheme = standardScheme
    const webviewSession = session.fromPartition('webview-temp')

    before((done) => {
      const protocol = webviewSession.protocol
      protocol.registerStringProtocol(zoomScheme, (request, callback) => {
        callback('hello')
      }, (error) => done(error))
    })

    after((done) => {
      const protocol = webviewSession.protocol
      protocol.unregisterProtocol(zoomScheme, (error) => done(error))
    })

    it('inherits the zoomFactor of the parent window', async () => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          webviewTag: true,
          nodeIntegration: true,
          zoomFactor: 1.2
        }
      })
      const zoomEventPromise = emittedOnce(ipcMain, 'webview-parent-zoom-level')
      w.loadFile(path.join(fixtures, 'pages', 'webview-zoom-factor.html'))

      const [, zoomFactor, zoomLevel] = await zoomEventPromise
      expect(zoomFactor).to.equal(1.2)
      expect(zoomLevel).to.equal(1)
    })

    it('maintains zoom level on navigation', async () => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          webviewTag: true,
          nodeIntegration: true,
          zoomFactor: 1.2
        }
      })
      const promise = new Promise((resolve) => {
        ipcMain.on('webview-zoom-level', (event, zoomLevel, zoomFactor, newHost, final) => {
          if (!newHost) {
            expect(zoomFactor).to.equal(1.44)
            expect(zoomLevel).to.equal(2.0)
          } else {
            expect(zoomFactor).to.equal(1.2)
            expect(zoomLevel).to.equal(1)
          }

          if (final) {
            resolve()
          }
        })
      })

      w.loadFile(path.join(fixtures, 'pages', 'webview-custom-zoom-level.html'))

      await promise
    })

    it('maintains zoom level when navigating within same page', async () => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          webviewTag: true,
          nodeIntegration: true,
          zoomFactor: 1.2
        }
      })
      const promise = new Promise((resolve) => {
        ipcMain.on('webview-zoom-in-page', (event, zoomLevel, zoomFactor, final) => {
          expect(zoomFactor).to.equal(1.44)
          expect(zoomLevel).to.equal(2.0)

          if (final) {
            resolve()
          }
        })
      })

      w.loadFile(path.join(fixtures, 'pages', 'webview-in-page-navigate.html'))

      await promise
    })

    it('inherits zoom level for the origin when available', async () => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          webviewTag: true,
          nodeIntegration: true,
          zoomFactor: 1.2
        }
      })
      w.loadFile(path.join(fixtures, 'pages', 'webview-origin-zoom-level.html'))

      const [, zoomLevel] = await emittedOnce(ipcMain, 'webview-origin-zoom-level')
      expect(zoomLevel).to.equal(2.0)
    })

    it('does not crash when navigating with zoom level inherited from parent', async () => {
      const w = new BrowserWindow({
        show: false,
        webPreferences: {
          webviewTag: true,
          nodeIntegration: true,
          zoomFactor: 1.2,
          session: webviewSession
        }
      })
      const attachPromise = emittedOnce(w.webContents, 'did-attach-webview')
      const readyPromise = emittedOnce(ipcMain, 'dom-ready')
      w.loadFile(path.join(fixtures, 'pages', 'webview-zoom-inherited.html'))
      const [, webview] = await attachPromise
      await readyPromise
      expect(webview.getZoomFactor()).to.equal(1.2)
      await w.loadURL(`${zoomScheme}://host1`)
    })
  })

  describe('nativeWindowOpen option', () => {
    let w: BrowserWindow
    beforeEach(async () => {
      w = new BrowserWindow({ show: false, webPreferences: { nodeIntegration: true, webviewTag: true } })
      await w.loadURL('about:blank')
    })
    afterEach(closeAllWindows)

    it('opens window of about:blank with cross-scripting enabled', async () => {
      // Don't wait for loading to finish.
      loadWebView(w.webContents, {
        allowpopups: 'on',
        nodeintegration: 'on',
        webpreferences: 'nativeWindowOpen=1',
        src: `file://${path.join(fixtures, 'api', 'native-window-open-blank.html')}`
      })

      const [, content] = await emittedOnce(ipcMain, 'answer')
      expect(content).to.equal('Hello')
    })

    it('opens window of same domain with cross-scripting enabled', async () => {
      // Don't wait for loading to finish.
      loadWebView(w.webContents, {
        allowpopups: 'on',
        nodeintegration: 'on',
        webpreferences: 'nativeWindowOpen=1',
        src: `file://${path.join(fixtures, 'api', 'native-window-open-file.html')}`
      })

      const [, content] = await emittedOnce(ipcMain, 'answer')
      expect(content).to.equal('Hello')
    })

    it('returns null from window.open when allowpopups is not set', async () => {
      // Don't wait for loading to finish.
      loadWebView(w.webContents, {
        nodeintegration: 'on',
        webpreferences: 'nativeWindowOpen=1',
        src: `file://${path.join(fixtures, 'api', 'native-window-open-no-allowpopups.html')}`
      })

      const [, { windowOpenReturnedNull }] = await emittedOnce(ipcMain, 'answer')
      expect(windowOpenReturnedNull).to.be.true()
    })

    it('blocks accessing cross-origin frames', async () => {
      // Don't wait for loading to finish.
      loadWebView(w.webContents, {
        allowpopups: 'on',
        nodeintegration: 'on',
        webpreferences: 'nativeWindowOpen=1',
        src: `file://${path.join(fixtures, 'api', 'native-window-open-cross-origin.html')}`
      })

      const [, content] = await emittedOnce(ipcMain, 'answer')
      const expectedContent =
          'Blocked a frame with origin "file://" from accessing a cross-origin frame.'

      expect(content).to.equal(expectedContent)
    })

    it('emits a new-window event', async () => {
      // Don't wait for loading to finish.
      const attributes = {
        allowpopups: 'on',
        nodeintegration: 'on',
        webpreferences: 'nativeWindowOpen=1',
        src: `file://${fixtures}/pages/window-open.html`
      }
      const { url, frameName } = await w.webContents.executeJavaScript(`
        new Promise((resolve, reject) => {
          const webview = document.createElement('webview')
          for (const [k, v] of Object.entries(${JSON.stringify(attributes)})) {
            webview.setAttribute(k, v)
          }
          document.body.appendChild(webview)
          webview.addEventListener('new-window', (e) => {
            resolve({url: e.url, frameName: e.frameName})
          })
        })
      `)

      expect(url).to.equal('http://host/')
      expect(frameName).to.equal('host')
    })

    it('emits a browser-window-created event', async () => {
      // Don't wait for loading to finish.
      loadWebView(w.webContents, {
        allowpopups: 'on',
        webpreferences: 'nativeWindowOpen=1',
        src: `file://${fixtures}/pages/window-open.html`
      })

      await emittedOnce(app, 'browser-window-created')
    })

    it('emits a web-contents-created event', (done) => {
      app.on('web-contents-created', function listener (event, contents) {
        if (contents.getType() === 'window') {
          app.removeListener('web-contents-created', listener)
          done()
        }
      })
      loadWebView(w.webContents, {
        allowpopups: 'on',
        webpreferences: 'nativeWindowOpen=1',
        src: `file://${fixtures}/pages/window-open.html`
      })
    })
  })

  describe('webpreferences attribute', () => {
    let w: BrowserWindow
    beforeEach(async () => {
      w = new BrowserWindow({ show: false, webPreferences: { nodeIntegration: true, webviewTag: true } })
      await w.loadURL('about:blank')
    })
    afterEach(closeAllWindows)
    
    it('can enable context isolation', async () => {
      loadWebView(w.webContents, {
        allowpopups: 'yes',
        preload: `file://${fixtures}/api/isolated-preload.js`,
        src: `file://${fixtures}/api/isolated.html`,
        webpreferences: 'contextIsolation=yes'
      })

      const [, data] = await emittedOnce(ipcMain, 'isolated-world')
      expect(data).to.deep.equal({
        preloadContext: {
          preloadProperty: 'number',
          pageProperty: 'undefined',
          typeofRequire: 'function',
          typeofProcess: 'object',
          typeofArrayPush: 'function',
          typeofFunctionApply: 'function',
          typeofPreloadExecuteJavaScriptProperty: 'undefined'
        },
        pageContext: {
          preloadProperty: 'undefined',
          pageProperty: 'string',
          typeofRequire: 'undefined',
          typeofProcess: 'undefined',
          typeofArrayPush: 'number',
          typeofFunctionApply: 'boolean',
          typeofPreloadExecuteJavaScriptProperty: 'number',
          typeofOpenedWindow: 'object'
        }
      })
    })
  })

  describe('permission request handlers', () => {
    let w: BrowserWindow
    beforeEach(async () => {
      w = new BrowserWindow({ show: false, webPreferences: { nodeIntegration: true, webviewTag: true } })
      await w.loadURL('about:blank')
    })
    afterEach(closeAllWindows)

    const partition = 'permissionTest'

    function setUpRequestHandler(webContentsId: number, requestedPermission: string) {
      return new Promise((resolve, reject) => {
        session.fromPartition(partition).setPermissionRequestHandler(function (webContents, permission, callback) {
          if (webContents.id === webContentsId) {
            // requestMIDIAccess with sysex requests both midi and midiSysex so
            // grant the first midi one and then reject the midiSysex one
            if (requestedPermission === 'midiSysex' && permission === 'midi') {
              return callback(true)
            }

            try {
              expect(permission).to.equal(requestedPermission)
            } catch (e) {
              return reject(e)
            }
            callback(false)
            resolve()
          }
        })
      })
    }
    afterEach(() => {
      session.fromPartition(partition).setPermissionRequestHandler(null)
    })

    // This is disabled because CI machines don't have cameras or microphones,
    // so Chrome responds with "NotFoundError" instead of
    // "PermissionDeniedError". It should be re-enabled if we find a way to mock
    // the presence of a microphone & camera.
    xit('emits when using navigator.getUserMedia api', async () => {
      const errorFromRenderer = emittedOnce(ipcMain, 'message')
      loadWebView(w.webContents, {
        src: `file://${fixtures}/pages/permissions/media.html`,
        partition,
        nodeintegration: 'on'
      })
      const [, webViewContents] = await emittedOnce(app, 'web-contents-created')
      setUpRequestHandler(webViewContents.id, 'media')
      const [, errorName] = await errorFromRenderer
      expect(errorName).to.equal('PermissionDeniedError')
    })

    it('emits when using navigator.geolocation api', async () => {
      const errorFromRenderer = emittedOnce(ipcMain, 'message')
      loadWebView(w.webContents, {
        src: `file://${fixtures}/pages/permissions/geolocation.html`,
        partition,
        nodeintegration: 'on'
      })
      const [, webViewContents] = await emittedOnce(app, 'web-contents-created')
      setUpRequestHandler(webViewContents.id, 'geolocation')
      const [, error] = await errorFromRenderer
      expect(error).to.equal('User denied Geolocation')
    })

    it('emits when using navigator.requestMIDIAccess without sysex api', async () => {
      const errorFromRenderer = emittedOnce(ipcMain, 'message')
      loadWebView(w.webContents, {
        src: `file://${fixtures}/pages/permissions/midi.html`,
        partition,
        nodeintegration: 'on'
      })
      const [, webViewContents] = await emittedOnce(app, 'web-contents-created')
      setUpRequestHandler(webViewContents.id, 'midi')
      const [, error] = await errorFromRenderer
      expect(error).to.equal('SecurityError')
    })

    it('emits when using navigator.requestMIDIAccess with sysex api', async () => {
      const errorFromRenderer = emittedOnce(ipcMain, 'message')
      loadWebView(w.webContents, {
        src: `file://${fixtures}/pages/permissions/midi-sysex.html`,
        partition,
        nodeintegration: 'on'
      })
      const [, webViewContents] = await emittedOnce(app, 'web-contents-created')
      setUpRequestHandler(webViewContents.id, 'midiSysex')
      const [, error] = await errorFromRenderer
      expect(error).to.equal('SecurityError')
    })

    it('emits when accessing external protocol', async () => {
      loadWebView(w.webContents, {
        src: `magnet:test`,
        partition,
      })
      const [, webViewContents] = await emittedOnce(app, 'web-contents-created')
      await setUpRequestHandler(webViewContents.id, 'openExternal')
    })

    it('emits when using Notification.requestPermission', async () => {
      const errorFromRenderer = emittedOnce(ipcMain, 'message')
      loadWebView(w.webContents, {
        src: `file://${fixtures}/pages/permissions/notification.html`,
        partition,
        nodeintegration: 'on'
      })
      const [, webViewContents] = await emittedOnce(app, 'web-contents-created')

      await setUpRequestHandler(webViewContents.id, 'notifications')

      const [, error] = await errorFromRenderer
      expect(error).to.equal('denied')
    })
  })

})