/**
* Disables a theme.
*
* @param \Symfony\Component\HttpFoundation\Request $request
* A request object containing a theme name and a valid token.
*
* @return \Symfony\Component\HttpFoundation\RedirectResponse
* Redirects back to the appearance admin page.
*
* @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
* Throws access denied when no theme or token is set in the request or when
* the token is invalid.
*/
public function disable(Request $request)
{
$theme = $request->get('theme');
$config = $this->config('system.theme');
if (isset($theme)) {
// Get current list of themes.
$themes = $this->themeHandler->listInfo();
// Check if the specified theme is one recognized by the system.
if (!empty($themes[$theme])) {
// Do not disable the default or admin theme.
if ($theme === $config->get('default') || $theme === $config->get('admin')) {
drupal_set_message($this->t('%theme is the default theme and cannot be disabled.', array('%theme' => $themes[$theme]->info['name'])), 'error');
} else {
$this->themeHandler->disable(array($theme));
drupal_set_message($this->t('The %theme theme has been disabled.', array('%theme' => $themes[$theme]->info['name'])));
}
} else {
drupal_set_message($this->t('The %theme theme was not found.', array('%theme' => $theme)), 'error');
}
return $this->redirect('system.themes_page');
}
throw new AccessDeniedHttpException();
}