Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\EventSubscriber;
Chris@0: 
Chris@0: use Drupal\Core\Extension\ModuleHandlerInterface;
Chris@0: use Drupal\Core\Routing\RouteSubscriberBase;
Chris@0: use Symfony\Component\Routing\RouteCollection;
Chris@0: 
Chris@0: /**
Chris@0:  * A route subscriber to remove routes that depend on modules being enabled.
Chris@0:  */
Chris@0: class ModuleRouteSubscriber extends RouteSubscriberBase {
Chris@0: 
Chris@0:   /**
Chris@0:    * The module handler.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Extension\ModuleHandlerInterface
Chris@0:    */
Chris@0:   protected $moduleHandler;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a ModuleRouteSubscriber object.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
Chris@0:    *   The module handler.
Chris@0:    */
Chris@0:   public function __construct(ModuleHandlerInterface $module_handler) {
Chris@0:     $this->moduleHandler = $module_handler;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function alterRoutes(RouteCollection $collection) {
Chris@0:     foreach ($collection as $name => $route) {
Chris@0:       if ($route->hasRequirement('_module_dependencies')) {
Chris@0:         $modules = $route->getRequirement('_module_dependencies');
Chris@0: 
Chris@0:         $explode_and = $this->explodeString($modules, '+');
Chris@0:         if (count($explode_and) > 1) {
Chris@0:           foreach ($explode_and as $module) {
Chris@0:             // If any moduleExists() call returns FALSE, remove the route and
Chris@0:             // move on to the next.
Chris@0:             if (!$this->moduleHandler->moduleExists($module)) {
Chris@0:               $collection->remove($name);
Chris@0:               continue 2;
Chris@0:             }
Chris@0:           }
Chris@0:         }
Chris@0:         else {
Chris@0:           // OR condition, exploding on ',' character.
Chris@0:           foreach ($this->explodeString($modules, ',') as $module) {
Chris@0:             if ($this->moduleHandler->moduleExists($module)) {
Chris@0:               continue 2;
Chris@0:             }
Chris@0:           }
Chris@0:           // If no modules are found, and we get this far, remove the route.
Chris@0:           $collection->remove($name);
Chris@0:         }
Chris@0:       }
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Explodes a string based on a separator.
Chris@0:    *
Chris@0:    * @param string $string
Chris@0:    *   The string to explode.
Chris@0:    * @param string $separator
Chris@0:    *   The string separator to explode with.
Chris@0:    *
Chris@0:    * @return array
Chris@0:    *   An array of exploded (and trimmed) values.
Chris@0:    */
Chris@0:   protected function explodeString($string, $separator = ',') {
Chris@0:     return array_filter(array_map('trim', explode($separator, $string)));
Chris@0:   }
Chris@0: 
Chris@0: }