UHF-12723: Add DrupalSettings class

This was previously implemented in hdbt.theme

Author: hyrsky

helfi_hakuvahti.services.yml

@@ -9,3 +9,5 @@ services:
 
   Drupal\helfi_hakuvahti\HakuvahtiInterface:
     class: Drupal\helfi_hakuvahti\Hakuvahti
+
+  Drupal\helfi_hakuvahti\DrupalSettings: ~

src/DrupalSettings.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\helfi_hakuvahti;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\Url;
+
+/**
+ * Get Hakuvahti settings for frontend.
+ */
+readonly class DrupalSettings {
+
+  /**
+   * Settings that are exposed to JavaScript.
+   */
+  public const array EXPOSED_SETTINGS = [
+    'hakuvahti_tos_checkbox_label',
+    'hakuvahti_tos_link_text',
+    'hakuvahti_tos_link_url',
+    'hakuvahti_instructions_link_url',
+  ];
+
+  public function __construct(
+    private ConfigFactoryInterface $configFactory,
+    private LanguageManagerInterface $languageManager,
+  ) {
+  }
+
+  /**
+   * Get settings as they should be exposed to JavaScript.
+   */
+  public function applyTo(array &$build): void {
+    $langcode = $this->languageManager
+      ->getCurrentLanguage(LanguageInterface::TYPE_CONTENT)
+      ->getId();
+
+    // Attempt to get the translated configuration.
+    // @todo Why is this needed?
+    $language = $this->languageManager->getLanguage($langcode);
+    $originalLanguage = $this->languageManager->getConfigOverrideLanguage();
+    $this->languageManager->setConfigOverrideLanguage($language);
+
+    try {
+      $cache = new CacheableMetadata();
+
+      $settings = $this->configFactory->get('helfi_hakuvahti.settings');
+
+      // Do not expose settings if base_url is not configured.
+      if (empty($settings->get('base_url'))) {
+        return;
+      }
+
+      $drupalSettings = [];
+      foreach (self::EXPOSED_SETTINGS as $exposed_setting) {
+        $drupalSettings[$exposed_setting] = $settings->get($exposed_setting) ?: NULL;
+      }
+
+      $drupalSettings['subscribe_url'] = Url::fromRoute('helfi_hakuvahti.subscribe')->toString();
+
+      $build['#attached']['drupalSettings']['hakuvahti'] = $drupalSettings;
+
+      $cache->addCacheableDependency($settings);
+      $cache->addCacheContexts(['languages:language_content']);
+      $cache->applyTo($build);
+    }
+    finally {
+      // Set the config back to the original language.
+      $this->languageManager->setConfigOverrideLanguage($originalLanguage);
+    }
+  }
+
+}

src/Form/SettingsForm.php

@@ -12,15 +12,6 @@
  */
 class SettingsForm extends ConfigFormBase {
 
-  use AutowireTrait;
-
-  public function __construct(
-    ConfigFactoryInterface $configFactory,
-    TypedConfigManagerInterface $typedConfigManager,
-  ) {
-    parent::__construct($configFactory, $typedConfigManager);
-  }
-
   /**
    * {@inheritdoc}
    */