Puppeteer.ts

/**
 * Copyright 2020 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {
  Puppeteer,
  CommonPuppeteerSettings,
  ConnectOptions,
} from '../common/Puppeteer.js';
import { BrowserFetcher, BrowserFetcherOptions } from './BrowserFetcher.js';
import {
  LaunchOptions,
  BrowserLaunchArgumentOptions,
} from './LaunchOptions.js';
import { BrowserConnectOptions } from '../common/BrowserConnector.js';
import { Browser } from '../common/Browser.js';
import Launcher, { ProductLauncher } from './Launcher.js';
import { PUPPETEER_REVISIONS } from '../revisions.js';
import { Product } from '../common/Product.js';

/**
 * Extends the main {@link Puppeteer} class with Node specific behaviour for fetching and
 * downloading browsers.
 *
 * If you're using Puppeteer in a Node environment, this is the class you'll get
 * when you run `require('puppeteer')` (or the equivalent ES `import`).
 *
 * @remarks
 *
 * The most common method to use is {@link PuppeteerNode.launch | launch}, which
 * is used to launch and connect to a new browser instance.
 *
 * See {@link Puppeteer | the main Puppeteer class} for methods common to all
 * environments, such as {@link Puppeteer.connect}.
 *
 * @example
 * The following is a typical example of using Puppeteer to drive automation:
 * ```js
 * const puppeteer = require('puppeteer');
 *
 * (async () => {
 *   const browser = await puppeteer.launch();
 *   const page = await browser.newPage();
 *   await page.goto('https://www.google.com');
 *   // other actions...
 *   await browser.close();
 * })();
 * ```
 *
 * Once you have created a `page` you have access to a large API to interact
 * with the page, navigate, or find certain elements in that page.
 * The {@link Page | `page` documentation} lists all the available methods.
 *
 * @public
 */
export class PuppeteerNode extends Puppeteer {
  private _lazyLauncher?: ProductLauncher;
  private _projectRoot?: string;
  private __productName?: Product;
  /**
   * @internal
   */
  _preferredRevision: string;

  /**
   * @internal
   */
  constructor(
    settings: {
      projectRoot?: string;
      preferredRevision: string;
      productName?: Product;
    } & CommonPuppeteerSettings
  ) {
    const { projectRoot, preferredRevision, productName, ...commonSettings } =
      settings;
    super(commonSettings);
    this._projectRoot = projectRoot;
    this.__productName = productName;
    this._preferredRevision = preferredRevision;
  }

  /**
   * This method attaches Puppeteer to an existing browser instance.
   *
   * @remarks
   *
   * @param options - Set of configurable options to set on the browser.
   * @returns Promise which resolves to browser instance.
   */
  connect(options: ConnectOptions): Promise<Browser> {
    if (options.product) this._productName = options.product;
    return super.connect(options);
  }

  /**
   * @internal
   */
  get _productName(): Product | undefined {
    return this.__productName;
  }

  // don't need any TSDoc here - because the getter is internal the setter is too.
  set _productName(name: Product | undefined) {
    if (this.__productName !== name) this._changedProduct = true;
    this.__productName = name;
  }

  /**
   * Launches puppeteer and launches a browser instance with given arguments
   * and options when specified.
   *
   * @remarks
   *
   * @example
   * You can use `ignoreDefaultArgs` to filter out `--mute-audio` from default arguments:
   * ```js
   * const browser = await puppeteer.launch({
   *   ignoreDefaultArgs: ['--mute-audio']
   * });
   * ```
   *
   * **NOTE** Puppeteer can also be used to control the Chrome browser,
   * but it works best with the version of Chromium it is bundled with.
   * There is no guarantee it will work with any other version.
   * Use `executablePath` option with extreme caution.
   * If Google Chrome (rather than Chromium) is preferred, a {@link https://www.google.com/chrome/browser/canary.html | Chrome Canary} or {@link https://www.chromium.org/getting-involved/dev-channel | Dev Channel} build is suggested.
   * In `puppeteer.launch([options])`, any mention of Chromium also applies to Chrome.
   * See {@link https://www.howtogeek.com/202825/what%E2%80%99s-the-difference-between-chromium-and-chrome/ | this article} for a description of the differences between Chromium and Chrome. {@link https://chromium.googlesource.com/chromium/src/+/lkgr/docs/chromium_browser_vs_google_chrome.md | This article} describes some differences for Linux users.
   *
   * @param options - Set of configurable options to set on the browser.
   * @returns Promise which resolves to browser instance.
   */
  launch(
    options: LaunchOptions &
      BrowserLaunchArgumentOptions &
      BrowserConnectOptions & {
        product?: Product;
        extraPrefsFirefox?: Record<string, unknown>;
      } = {}
  ): Promise<Browser> {
    if (options.product) this._productName = options.product;
    return this._launcher.launch(options);
  }

  /**
   * @remarks
   *
   * **NOTE** `puppeteer.executablePath()` is affected by the `PUPPETEER_EXECUTABLE_PATH`
   * and `PUPPETEER_CHROMIUM_REVISION` environment variables.
   *
   * @returns A path where Puppeteer expects to find the bundled browser.
   * The browser binary might not be there if the download was skipped with
   * the `PUPPETEER_SKIP_DOWNLOAD` environment variable.
   */
  executablePath(channel?: string): string {
    return this._launcher.executablePath(channel);
  }

  /**
   * @internal
   */
  get _launcher(): ProductLauncher {
    if (
      !this._lazyLauncher ||
      this._lazyLauncher.product !== this._productName ||
      this._changedProduct
    ) {
      switch (this._productName) {
        case 'firefox':
          this._preferredRevision = PUPPETEER_REVISIONS.firefox;
          break;
        case 'chrome':
        default:
          this._preferredRevision = PUPPETEER_REVISIONS.chromium;
      }
      this._changedProduct = false;
      this._lazyLauncher = Launcher(
        this._projectRoot,
        this._preferredRevision,
        this._isPuppeteerCore,
        this._productName
      );
    }
    return this._lazyLauncher;
  }

  /**
   * The name of the browser that is under automation (`"chrome"` or `"firefox"`)
   *
   * @remarks
   * The product is set by the `PUPPETEER_PRODUCT` environment variable or the `product`
   * option in `puppeteer.launch([options])` and defaults to `chrome`.
   * Firefox support is experimental.
   */
  get product(): string {
    return this._launcher.product;
  }

  /**
   *
   * @param options - Set of configurable options to set on the browser.
   * @returns The default flags that Chromium will be launched with.
   */
  defaultArgs(options: BrowserLaunchArgumentOptions = {}): string[] {
    return this._launcher.defaultArgs(options);
  }

  /**
   * @param options - Set of configurable options to specify the settings
   * of the BrowserFetcher.
   * @returns A new BrowserFetcher instance.
   */
  createBrowserFetcher(options: BrowserFetcherOptions): BrowserFetcher {
    if (!this._projectRoot) {
      throw new Error(
        '_projectRoot is undefined. Unable to create a BrowserFetcher.'
      );
    }
    return new BrowserFetcher(this._projectRoot, options);
  }
}