apply-evasions.js

// initial evasions from @sangaline
//   https://intoli.com/blog/not-possible-to-block-chrome-headless/
//   https://intoli.com/blog/not-possible-to-block-chrome-headless/test-headless-final.js

module.exports = async function(page) {
  // Pass the User-Agent Test.
  const userAgent =
    'Mozilla/5.0 (X11; Linux x86_64)' +
    'AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.39 Safari/537.36';
  await page.setUserAgent(userAgent);

  // Pass the Webdriver Test.
  await page.evaluateOnNewDocument(() => {
    const newProto = navigator.__proto__;
    delete newProto.webdriver;
    navigator.__proto__ = newProto;
  });

  // Pass the Chrome Test.
  await page.evaluateOnNewDocument(() => {
    // We can mock this in as much depth as we need for the test.
    window.chrome = {
      runtime: {}
    };
  });

  // Pass the Permissions Test.
  await page.evaluateOnNewDocument(() => {
    const originalQuery = window.navigator.permissions.query;
    window.navigator.permissions.__proto__.query = parameters =>
      parameters.name === 'notifications'
        ? Promise.resolve({state: Notification.permission})
        : originalQuery(parameters);

      // Inspired by: https://github.com/ikarienator/phantomjs_hide_and_seek/blob/master/5.spoofFunctionBind.js
      const oldCall = Function.prototype.call;
      function call() {
          return oldCall.apply(this, arguments);
      }
      Function.prototype.call = call;

      const nativeToStringFunctionString = Error.toString().replace(/Error/g, "toString");
      const oldToString = Function.prototype.toString;

      function functionToString() {
        if (this === window.navigator.permissions.query) {
          return "function query() { [native code] }";
        }
        if (this === functionToString) {
          return nativeToStringFunctionString;
        }
        return oldCall.call(oldToString, this);
      }
      Function.prototype.toString = functionToString;
  });

  // Pass the Plugins Length Test.
  await page.evaluateOnNewDocument(() => {
    // Overwrite the `plugins` property to use a custom getter.
    Object.defineProperty(navigator, 'plugins', {
      // This just needs to have `length > 0` for the current test,
      // but we could mock the plugins too if necessary.
      get: () => [1, 2, 3, 4, 5]
    });
  });

  // Pass the Languages Test.
  await page.evaluateOnNewDocument(() => {
    // Overwrite the `plugins` property to use a custom getter.
    Object.defineProperty(navigator, 'languages', {
      get: () => ['en-US', 'en']
    });
  });

  // Pass the iframe Test
  await page.evaluateOnNewDocument(() => {
    Object.defineProperty(HTMLIFrameElement.prototype, 'contentWindow', {
      get: function() {
        return window;
      }
    });
  });

  // Pass toString test, though it breaks console.debug() from working
  await page.evaluateOnNewDocument(() => {
    window.console.debug = () => {
      return null;
    };
  });
};