ISTWCMS-3908: Adding new plugin to handle block restrictions for dashboard.

src/Plugin/LayoutBuilderRestriction/UWDashboardBlockRestriction.php

+<?php
+
+
+namespace Drupal\uw_dashboard\Plugin\LayoutBuilderRestriction;
+
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\layout_builder\OverridesSectionStorageInterface;
+use Drupal\layout_builder_restrictions\Plugin\LayoutBuilderRestrictionBase;
+use Drupal\layout_builder_restrictions\Traits\PluginHelperTrait;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * UW Dashboard Block Restriction Plugin.
+ *
+ * @LayoutBuilderRestriction(
+ *   id = "uw_dashboard_block_restriction",
+ *   title = @Translation("UW Dashboard Block Restriction"),
+ *   description = @Translation("Restrict blocks/layouts for UW Dashboard"),
+ * )
+ */
+class UWDashboardBlockRestriction extends LayoutBuilderRestrictionBase {
+
+  use PluginHelperTrait;
+
+  /**
+   * Module handler service.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * Database connection service.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $database;
+
+  /**
+   * @inheritDoc
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('module_handler'),
+      $container->get('database')
+    );
+  }
+
+  /**
+   * Constructs a Drupal\Component\Plugin\PluginBase object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler.
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, ModuleHandlerInterface $module_handler, Connection $connection) {
+    $this->configuration = $configuration;
+    $this->pluginId = $plugin_id;
+    $this->pluginDefinition = $plugin_definition;
+    $this->moduleHandler = $module_handler;
+    $this->database = $connection;
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public function alterBlockDefinitions(array $definitions, array $context) {
+    // Respect restrictions on allowed blocks specified by the section storage.
+    if (isset($context['section_storage'])) {
+      $default = $context['section_storage'];
+
+      if ($default->getPluginId() === 'dashboards') {
+        foreach ($definitions as $key => $single_definition) {
+          if (strpos($key, 'uw') === FALSE) {
+            unset($definitions[$key]);
+          }
+        }
+      }
+    }
+    return $definitions;
+  }
+}