void ElectronJavaScriptDialogManager::RunJavaScriptDialog()

in shell/browser/electron_javascript_dialog_manager.cc [33:109]
60 lines of code
15 McCabe index (conditional complexity)

void ElectronJavaScriptDialogManager::RunJavaScriptDialog(
    content::WebContents* web_contents,
    content::RenderFrameHost* rfh,
    JavaScriptDialogType dialog_type,
    const std::u16string& message_text,
    const std::u16string& default_prompt_text,
    DialogClosedCallback callback,
    bool* did_suppress_message) {
  auto origin_url = rfh->GetLastCommittedURL();

  std::string origin;
  // For file:// URLs we do the alert filtering by the
  // file path currently loaded
  if (origin_url.SchemeIsFile()) {
    origin = origin_url.path();
  } else {
    origin = origin_url.DeprecatedGetOriginAsURL().spec();
  }

  if (origin_counts_[origin] == kUserWantsNoMoreDialogs) {
    return std::move(callback).Run(false, std::u16string());
  }

  if (dialog_type != JavaScriptDialogType::JAVASCRIPT_DIALOG_TYPE_ALERT &&
      dialog_type != JavaScriptDialogType::JAVASCRIPT_DIALOG_TYPE_CONFIRM) {
    std::move(callback).Run(false, std::u16string());
    return;
  }

  auto* web_preferences = WebContentsPreferences::From(web_contents);

  if (web_preferences && web_preferences->ShouldDisableDialogs()) {
    return std::move(callback).Run(false, std::u16string());
  }

  // No default button
  int default_id = -1;
  int cancel_id = 0;

  std::vector<std::string> buttons = {"OK"};
  if (dialog_type == JavaScriptDialogType::JAVASCRIPT_DIALOG_TYPE_CONFIRM) {
    buttons.emplace_back("Cancel");
    // First button is default, second button is cancel
    default_id = 0;
    cancel_id = 1;
  }

  origin_counts_[origin]++;

  std::string checkbox;
  if (origin_counts_[origin] > 1 && web_preferences &&
      web_preferences->ShouldUseSafeDialogs() &&
      !web_preferences->GetSafeDialogsMessage(&checkbox)) {
    checkbox = "Prevent this app from creating additional dialogs";
  }

  // Don't set parent for offscreen window.
  NativeWindow* window = nullptr;
  if (web_preferences && !web_preferences->IsOffscreen()) {
    auto* relay = NativeWindowRelay::FromWebContents(web_contents);
    if (relay)
      window = relay->GetNativeWindow();
  }

  electron::MessageBoxSettings settings;
  settings.parent_window = window;
  settings.checkbox_label = checkbox;
  settings.buttons = buttons;
  settings.default_id = default_id;
  settings.cancel_id = cancel_id;
  settings.message = base::UTF16ToUTF8(message_text);

  electron::ShowMessageBox(
      settings,
      base::BindOnce(&ElectronJavaScriptDialogManager::OnMessageBoxCallback,
                     base::Unretained(this), std::move(callback), origin));
}