Keep file with Chromedriver in chrome://downloads - selenium

Question

I'm trying to automate the download of an XML file with Google Chrome.
I'm using:
Google Chrome v73.0.3683.75 (64 bits)
Chromedriver v73
Selenium WebDriver v3.14.0
C#
The problem comes up when a message of harmful file appears:
As I'm using Chromedriver, I can not interact with this message, so I tried to accept the download from the chrome://downloads page.
Once I open the chrome://downloads page, I click on the Keep button, but an Alert comes up again to confirm the download.
This popup is not a popup Selenium and Chromedriver can Handle with the Dismiss()/Accept()/SendKeys()/... methods. When I try to SwitchTo() it, Chromedriver crashes.
I tried to directly send the keystrokes of {TAB} and {SPACE}/{RIGHT} and {ENTER}, but Chrome seems not to catch them...
The full code is:
String currentWindow = this.Drivers[Navegador].CurrentWindowHandle;
String popupHandle = "";
((IJavaScriptExecutor)this.Drivers[Navegador]).ExecuteScript("window.open('about:blank','_blank')");
ReadOnlyCollection<String> tabs = this.Drivers[Navegador].WindowHandles;
foreach (string handle in tabs){
if (handle != currentWindow){
popupHandle = handle;
break;
}
}
this.Drivers[Navegador].SwitchTo().Window(popupHandle);
this.Drivers[Navegador].Navigate().GoToUrl("chrome://downloads");
String script = "return document.querySelector('body > downloads-manager').shadowRoot.querySelector('#downloadsList > downloads-item').shadowRoot.querySelector('#dangerous > paper-button:nth-child(2)');";
//String script = "return document.querySelector('body > downloads-manager').shadowRoot.querySelector('#downloadsList > downloads-item:nth-child(2)').shadowRoot.querySelector('#url').textContent;";
IWebElement boton = (IWebElement) ((IJavaScriptExecutor) this.Drivers[Navegador]).ExecuteScript(script);
boton.Click();
Thread.Sleep(2000);
SendKeys.Send("{TAB}{SPACE}");
Thread.Sleep(1000);
this.Drivers[Navegador].Close();
this.Drivers[Navegador].SwitchTo().Window(currentWindow);
this.Drivers[Navegador].SwitchTo().DefaultContent();
result = true;
IMPORTANT NOTE:
I tried to launch Chrome with all the flags/options/experimental_options/user_preferences/... possible and it doesn't work. These options/arguments seem to be deprecated in the latest versions of Chrome or Chromedriver.

Answer 1

As discussed with OP, answering the question in Java.
Encountered the same problem few months back, so this is how it worked for me, might work for you as well.
Map<String, Object> chromePreferences = new Hashtable<String, Object>();
// Below preferences will disable popup dialog while downloading the file
chromePreferences.put("profile.default_content_settings.popups", 0);
chromePreferences.put("download.prompt_for_download", "false");
// Set the customised path for downloading the file, if required
chromePreferences.put("download.default_directory", "path");
ChromeOptions chromeOptions = new ChromeOptions();
chromeOptions.setExperimentalOption("prefs", chromePreferences);
DesiredCapabilities cap = DesiredCapabilities.chrome();
cap.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
cap.setCapability(ChromeOptions.CAPABILITY, chromeOptions);
//Now initiate ChromeDriver with the capabilities set above and continue with your automation
ChromeDriver chromeDriver = new ChromeDriver(cap);

Answer 2

I recently ran into this issue, and due to the deprecation of some of the methods in the ChromeDriver, the above solution didn't work.
After a lot of research I decided to switch to IE and explore an alternate option with the inspiration from this article - https://sqa.stackexchange.com/questions/3169/downloading-a-file-in-internet-explorer-through-selenium/3520 I came up with this solution in JAVA.
It is not as 'clean' but it worked for me.
public static void main(String[] args) throws NoAlertPresentException,InterruptedException {
System.setProperty("webdriver.ie.driver","C:\\selenium-java-3.141.59\\IEDriverServer.exe");
String url ="myfileurl";
WebDriver driver = new InternetExplorerDriver();
driver.get(url);
try {
Robot robot = new Robot();
Thread.sleep(2000);
//press alt+s key to save
robot.keyPress(KeyEvent.VK_ALT);
robot.keyPress(KeyEvent.VK_S);
robot.keyRelease(KeyEvent.VK_S);
robot.keyRelease(KeyEvent.VK_ALT);
Thread.sleep(2000);
}
catch (AWTException e) {
e.printStackTrace();
}
driver.close();
}