--- /dev/null
+<?php
+
+namespace Drupal\Core\Menu;
+
+use Drupal\Component\Plugin\Exception\PluginException;
+use Drupal\Core\Access\AccessManagerInterface;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Controller\ControllerResolverInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+use Drupal\Core\Plugin\Discovery\ContainerDerivativeDiscoveryDecorator;
+use Drupal\Core\Plugin\Discovery\YamlDiscovery;
+use Drupal\Core\Plugin\Factory\ContainerFactory;
+use Drupal\Core\Session\AccountInterface;
+use Symfony\Component\HttpFoundation\RequestStack;
+
+/**
+ * Defines a contextual link plugin manager to deal with contextual links.
+ *
+ * @see \Drupal\Core\Menu\ContextualLinkInterface
+ */
+class ContextualLinkManager extends DefaultPluginManager implements ContextualLinkManagerInterface {
+
+ /**
+ * Provides default values for a contextual link definition.
+ *
+ * @var array
+ */
+ protected $defaults = [
+ // (required) The name of the route to link to.
+ 'route_name' => '',
+ // (required) The contextual links group.
+ 'group' => '',
+ // The static title text for the link.
+ 'title' => '',
+ // The default link options.
+ 'options' => [],
+ // The weight of the link.
+ 'weight' => NULL,
+ // Default class for contextual link implementations.
+ 'class' => '\Drupal\Core\Menu\ContextualLinkDefault',
+ // The plugin id. Set by the plugin system based on the top-level YAML key.
+ 'id' => '',
+ ];
+
+ /**
+ * A controller resolver object.
+ *
+ * @var \Symfony\Component\HttpKernel\Controller\ControllerResolverInterface
+ */
+ protected $controllerResolver;
+
+ /**
+ * The access manager.
+ *
+ * @var \Drupal\Core\Access\AccessManagerInterface
+ */
+ protected $accessManager;
+
+ /**
+ * The current user.
+ *
+ * @var \Drupal\Core\Session\AccountInterface
+ */
+ protected $account;
+
+ /**
+ * The request stack.
+ *
+ * @var \Symfony\Component\HttpFoundation\RequestStack
+ */
+ protected $requestStack;
+
+ /**
+ * A static cache of all the contextual link plugins by group name.
+ *
+ * @var array
+ */
+ protected $pluginsByGroup;
+
+ /**
+ * Constructs a new ContextualLinkManager instance.
+ *
+ * @param \Drupal\Core\Controller\ControllerResolverInterface $controller_resolver
+ * The controller resolver.
+ * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+ * The module handler.
+ * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+ * The cache backend.
+ * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+ * The language manager.
+ * @param \Drupal\Core\Access\AccessManagerInterface $access_manager
+ * The access manager.
+ * @param \Drupal\Core\Session\AccountInterface $account
+ * The current user.
+ * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
+ * The request stack.
+ */
+ public function __construct(ControllerResolverInterface $controller_resolver, ModuleHandlerInterface $module_handler, CacheBackendInterface $cache_backend, LanguageManagerInterface $language_manager, AccessManagerInterface $access_manager, AccountInterface $account, RequestStack $request_stack) {
+ $this->factory = new ContainerFactory($this, '\Drupal\Core\Menu\ContextualLinkInterface');
+ $this->controllerResolver = $controller_resolver;
+ $this->accessManager = $access_manager;
+ $this->account = $account;
+ $this->moduleHandler = $module_handler;
+ $this->requestStack = $request_stack;
+ $this->alterInfo('contextual_links_plugins');
+ $this->setCacheBackend($cache_backend, 'contextual_links_plugins:' . $language_manager->getCurrentLanguage()->getId(), ['contextual_links_plugins']);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getDiscovery() {
+ if (!isset($this->discovery)) {
+ $yaml_discovery = new YamlDiscovery('links.contextual', $this->moduleHandler->getModuleDirectories());
+ $yaml_discovery->addTranslatableProperty('title', 'title_context');
+ $this->discovery = new ContainerDerivativeDiscoveryDecorator($yaml_discovery);
+ }
+ return $this->discovery;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function processDefinition(&$definition, $plugin_id) {
+ parent::processDefinition($definition, $plugin_id);
+
+ // If there is no route name, this is a broken definition.
+ if (empty($definition['route_name'])) {
+ throw new PluginException(sprintf('Contextual link plugin (%s) definition must include "route_name".', $plugin_id));
+ }
+ // If there is no group name, this is a broken definition.
+ if (empty($definition['group'])) {
+ throw new PluginException(sprintf('Contextual link plugin (%s) definition must include "group".', $plugin_id));
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getContextualLinkPluginsByGroup($group_name) {
+ if (isset($this->pluginsByGroup[$group_name])) {
+ $contextual_links = $this->pluginsByGroup[$group_name];
+ }
+ elseif ($cache = $this->cacheBackend->get($this->cacheKey . ':' . $group_name)) {
+ $contextual_links = $cache->data;
+ $this->pluginsByGroup[$group_name] = $contextual_links;
+ }
+ else {
+ $contextual_links = [];
+ foreach ($this->getDefinitions() as $plugin_id => $plugin_definition) {
+ if ($plugin_definition['group'] == $group_name) {
+ $contextual_links[$plugin_id] = $plugin_definition;
+ }
+ }
+ $this->cacheBackend->set($this->cacheKey . ':' . $group_name, $contextual_links);
+ $this->pluginsByGroup[$group_name] = $contextual_links;
+ }
+ return $contextual_links;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getContextualLinksArrayByGroup($group_name, array $route_parameters, array $metadata = []) {
+ $links = [];
+ $request = $this->requestStack->getCurrentRequest();
+ foreach ($this->getContextualLinkPluginsByGroup($group_name) as $plugin_id => $plugin_definition) {
+ /** @var $plugin \Drupal\Core\Menu\ContextualLinkInterface */
+ $plugin = $this->createInstance($plugin_id);
+ $route_name = $plugin->getRouteName();
+
+ // Check access.
+ if (!$this->accessManager->checkNamedRoute($route_name, $route_parameters, $this->account)) {
+ continue;
+ }
+
+ $links[$plugin_id] = [
+ 'route_name' => $route_name,
+ 'route_parameters' => $route_parameters,
+ 'title' => $plugin->getTitle($request),
+ 'weight' => $plugin->getWeight(),
+ 'localized_options' => $plugin->getOptions(),
+ 'metadata' => $metadata,
+ ];
+ }
+
+ $this->moduleHandler->alter('contextual_links', $links, $group_name, $route_parameters);
+
+ return $links;
+ }
+
+}