Display a message on blog posts over a year old

References #30

config/opdavies_blog.settings.yml

@@ -0,0 +1 @@
+old_post_message_text: '<strong>Warning:</strong> This post is over a year old. I don''t always update old posts with new information, so some of this information may be out of date.'

phpunit.xml.dist

@@ -9,7 +9,7 @@
     <ini name="error_reporting" value="32767"/>
     <ini name="memory_limit" value="-1"/>
     <env name="SIMPLETEST_BASE_URL" value="https://localhost"/>
-    <env name="SIMPLETEST_DB" value="sqlite://localhost/:memory:"/>
+    <env name="SIMPLETEST_DB" value="sqlite://localhost//tmp/.test.sqlite"/>
     <env name="BROWSERTEST_OUTPUT_DIRECTORY" value=""/>
     <env name="BROWSERTEST_OUTPUT_BASE_URL" value=""/>
     <env name="MINK_DRIVER_CLASS" value=''/>

web/modules/custom/blog/config/schema/opdavies_blog.schema.yml

@@ -2,5 +2,7 @@ opdavies_blog.settings:
   type: config_object
   label: 'Blog module configuration'
   mapping:
+    old_post_message_text:
+      type: string
     zapier_post_tweet_url:
       type: string

web/modules/custom/blog/opdavies_blog.services.yml

@@ -1,4 +1,9 @@
 services:
+  Drupal\opdavies_blog\EventSubscriber\DisplayMessageOnOldPosts:
+    autowire: true
+    tags:
+      - { name: event_subscriber }
+
   Drupal\opdavies_blog\EventSubscriber\PushBlogPostToSocialMedia:
     autowire: true
     tags:

web/modules/custom/blog/src/EventSubscriber/DisplayMessageOnOldPosts.php

@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opdavies_blog\EventSubscriber;
+
+use Drupal\Component\Datetime\TimeInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Messenger\MessengerInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\core_event_dispatcher\Event\Entity\AbstractEntityEvent;
+use Drupal\hook_event_dispatcher\HookEventDispatcherInterface;
+use Drupal\opdavies_blog\Entity\Node\Post;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+final class DisplayMessageOnOldPosts implements EventSubscriberInterface {
+
+  use StringTranslationTrait;
+
+  private ConfigFactoryInterface $configFactory;
+
+  private MessengerInterface $messenger;
+
+  private TimeInterface $time;
+
+  public function __construct(
+    ConfigFactoryInterface $configFactory,
+    MessengerInterface $messenger,
+    TimeInterface $time
+  ) {
+    $this->configFactory = $configFactory;
+    $this->messenger = $messenger;
+    $this->time = $time;
+  }
+
+  public function displayMessage(AbstractEntityEvent $event): void {
+    $entity = $event->getEntity();
+
+    if ($entity->getEntityTypeId() != 'node') {
+      return;
+    }
+
+    if ($entity->bundle() != 'post') {
+      return;
+    }
+
+    if ($this->wasPostPublishedTooRecently($entity)) {
+      return;
+    }
+
+    $text = $this->configFactory->get('opdavies_blog.settings')
+      ->get('old_post_message_text');
+
+    $this->messenger->addStatus($this->t($text));
+  }
+
+  public static function getSubscribedEvents() {
+    return [
+      HookEventDispatcherInterface::ENTITY_VIEW => 'displayMessage',
+    ];
+  }
+
+  private function wasPostPublishedTooRecently(Post $post): bool {
+    $currentTime = $this->time->getRequestTime();
+    $postAgeInSeconds = $currentTime - $post->getCreatedTime();
+    $maxAgeInSeconds = 60 * 60 * 24 * 365;
+
+    return $postAgeInSeconds < $maxAgeInSeconds;
+  }
+
+}

web/modules/custom/blog/tests/modules/blog_test/opdavies_blog_test.info.yml

@@ -2,3 +2,5 @@ name: Oliver Davies Posts Test
 type: module
 core_version_requirement: ^8 || ^9
 hidden: true
+dependencies:
+  - drupal:node

web/modules/custom/blog/tests/src/Functional/DisplayMessageOnOldPostsTest.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Drupal\Tests\opdavies_blog\Functional;
+
+use Carbon\Carbon;
+use Drupal\opdavies_blog_test\Factory\PostFactory;
+use Drupal\Tests\BrowserTestBase;
+
+final class DisplayMessageOnOldPostsTest extends BrowserTestBase {
+
+  protected static $modules = [
+    'field',
+    'link',
+    'node',
+    'taxonomy',
+
+    'hook_event_dispatcher',
+    'core_event_dispatcher',
+
+    'opdavies_blog_test',
+    'opdavies_blog',
+  ];
+
+  /** @test */
+  public function a_message_is_displayed_on_posts_over_a_year_old(): void {
+    \Drupal::configFactory()->getEditable('opdavies_blog.settings')
+      ->set('old_post_message_text', 'This is an old post.')
+      ->save(TRUE);
+
+    $post = (new PostFactory())->create([
+      'created' => Carbon::now()->subYear()->subDay()->getTimestamp(),
+    ]);
+    $post->save();
+
+    $this->drupalGet('node/1');
+
+    $this->assertSession()->pageTextContainsOnce('This is an old post.');
+  }
+
+  /** @test */
+  public function a_message_is_not_displayed_for_posts_less_than_a_year_old(): void {
+    \Drupal::configFactory()->getEditable('opdavies_blog.settings')
+      ->set('old_post_message_text', 'This is an old post.')
+      ->save(TRUE);
+
+    $post = (new PostFactory())->create([
+      'created' => Carbon::now()->subDays(364)->getTimestamp(),
+    ]);
+    $post->save();
+
+    $this->drupalGet('node/1');
+
+    $this->assertSession()->pageTextNotContains('This is an old post.');
+  }
+
+  /** @test */
+  public function a_message_is_not_displayed_for_non_post_nodes(): void {
+    $this->drupalCreateContentType(['type' => 'page']);
+
+    \Drupal::configFactory()->getEditable('opdavies_blog.settings')
+      ->set('old_post_message_text', 'This is an old post.')
+      ->save(TRUE);
+
+    $this->drupalCreateNode([
+      'created' => Carbon::now()->subYear()->subDay()->getTimestamp(),
+      'type' => 'page',
+    ]);
+
+    $this->drupalGet('node/1');
+
+    $this->assertSession()->pageTextNotContains('This is an old post.');
+  }
+
+}