Added contextual menu block

src/Plugin/Block/ContextualMenu.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\opencase\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+use Drupal\Core\Link;
+
+/**
+ * Provides a 'ContextualMenu' block.
+ *
+ * @Block(
+ *  id = "contextual_menu",
+ *  admin_label = @Translation("OpenCase Contextual Menu"),
+ * )
+ */
+class ContextualMenu extends BlockBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+
+    $route_name = \Drupal::routeMatch()->getRouteName();
+    error_log($route_name);
+    switch ($route_name) {
+      case 'entity.oc_actor.canonical':
+        $markup = $this->actorPage();
+        break;
+      case 'view.cases.page_1':
+        $markup = $this->caseListPage();
+        break;
+    }
+
+    $build = [];
+    $build['contextual_menu'] = [
+      '#markup' => $markup,
+      '#cache' => ['max-age' => 0]
+    ];
+    return $build;
+  }
+
+  
+  /**
+   * Contextual menu for Actor page
+   */
+  private function actorPage() {
+    $actor = \Drupal::routeMatch()->getParameter('oc_actor');
+    $linkText = 'Case List';
+    $url = '/opencase/oc_actor/'.$actor->id().'/case_list';
+    return "<a href='$url'>$linkText</a>";
+  }
+
+  /**
+   * Contextual menu for Case list page
+   */
+  private function caseListPage() {
+    $actor_id = \Drupal::routeMatch()->getParameter('actor_id');
+    $actor = \Drupal::entityTypeManager()->getStorage('oc_actor')->load($actor_id);
+    return $actor->toLink()->toString();
+  }
+
+  /**
+   * Contextual menu for Case page
+   */
+  private function casePage($case_id) {
+
+  }
+
+  /**
+   * Contextual menu for Activity list page
+   */
+  private function activityListPage($case_id) {
+
+  }
+}