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<?php
namespace Drupal\Core\Theme;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Extension\ThemeHandlerInterface;
use Drupal\Core\Routing\Access\AccessInterface;
/**
* Provides access checking for themes for routing and theme negotiation.
*/
class ThemeAccessCheck implements AccessInterface {
/**
* The theme handler.
*
* @var \Drupal\Core\Extension\ThemeHandlerInterface
*/
protected $themeHandler;
/**
* Constructs a \Drupal\Core\Theme\Registry object.
*
* @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
* The theme handler.
*/
public function __construct(ThemeHandlerInterface $theme_handler) {
$this->themeHandler = $theme_handler;
}
/**
* Checks access to the theme for routing.
*
* @param string $theme
* The name of a theme.
*
* @return \Drupal\Core\Access\AccessResultInterface
* The access result.
*/
public function access($theme) {
// Cacheable until the theme settings are modified.
return AccessResult::allowedIf($this->checkAccess($theme))->addCacheTags(['config:' . $theme . '.settings']);
}
/**
* Indicates whether the theme is accessible based on whether it is installed.
*
* @param string $theme
* The name of a theme.
*
* @return bool
* TRUE if the theme is installed, FALSE otherwise.
*/
public function checkAccess($theme) {
$themes = $this->themeHandler->listInfo();
return !empty($themes[$theme]->status);
}
}