Store and display the subscribed tags

src/Content/Conversation.php

@@ -38,6 +38,7 @@ use Friendica\Database\DBA;
 use Friendica\Model\Contact;
 use Friendica\Model\Item as ItemModel;
 use Friendica\Model\Post;
+use Friendica\Model\Post\Category;
 use Friendica\Model\Tag;
 use Friendica\Model\User;
 use Friendica\Model\Verb;
@@ -743,7 +744,12 @@ class Conversation
 				$row['direction'] = ['direction' => 6, 'title' => $this->l10n->t('You are following %s.', $row['causer-name'] ?: $row['author-name'])];
 				break;
 			case ItemModel::PR_TAG:
-				$row['direction'] = ['direction' => 4, 'title' => $this->l10n->t('You subscribed to one or more tags in this post.')];
+				$tags = Category::getArrayByURIId($row['uri-id'], $row['uid'], Category::SUBCRIPTION);
+				if (!empty($tags)) {
+					$row['direction'] = ['direction' => 4, 'title' => $this->l10n->t('You subscribed to %s.', implode(', ', $tags))];
+				} else {
+					$row['direction'] = ['direction' => 4, 'title' => $this->l10n->t('You subscribed to one or more tags in this post.')];
+				}
 				break;
 			case ItemModel::PR_ANNOUNCEMENT:
 				if (!empty($row['causer-id']) && $this->pConfig->get($this->session->getLocalUserId(), 'system', 'display_resharer')) {

src/Model/Item.php

@@ -32,6 +32,7 @@ use Friendica\Core\System;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\Post\Category;
 use Friendica\Network\HTTPException\InternalServerErrorException;
 use Friendica\Protocol\Activity;
 use Friendica\Protocol\ActivityPub;
@@ -1509,10 +1510,13 @@ class Item
 			return;
 		}
 
-		$uids = Tag::getUIDListByURIId($item['uri-id']);
+		foreach (Tag::getUIDListByURIId($item['uri-id']) as $uid => $tags) {
-		foreach ($uids as $uid) {
 			$stored = self::storeForUserByUriId($item['uri-id'], $uid, ['post-reason' => self::PR_TAG]);
 			Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
+			foreach ($tags as $tag) {
+				$stored = Category::storeFileByURIId($item['uri-id'], $uid, Category::SUBCRIPTION, $tag);
+				Logger::debug('Stored tag subscription for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, $tag, 'stored' => $stored]);
+			}
 		}
 	}
 

src/Model/Post/Category.php

@@ -36,6 +36,7 @@ class Category
     const UNKNOWN           = 0;
     const CATEGORY          = 3;
     const FILE              = 5;
+	const SUBCRIPTION       = 10;
 
 	/**
 	 * Delete all categories and files from a given uri-id and user
@@ -80,7 +81,7 @@ class Category
 	{
 		$file_text = '';
 
-		$tags = DBA::selectToArray('category-view', ['type', 'name'], ['uri-id' => $uri_id, 'uid' => $uid]);
+		$tags = DBA::selectToArray('category-view', ['type', 'name'], ['uri-id' => $uri_id, 'uid' => $uid, 'type' => [Category::FILE, Category::CATEGORY]]);
 		foreach ($tags as $tag) {
 			if ($tag['type'] == self::CATEGORY) {
 				$file_text .= '<' . $tag['name'] . '>';
@@ -177,12 +178,7 @@ class Category
 					continue;
 				}
 
-				DBA::replace('post-category', [
+				self::storeByURIId($uri_id, $uid, self::FILE, $tagid);
-					'uri-id' => $uri_id,
-					'uid' => $uid,
-					'type' => self::FILE,
-					'tid' => $tagid
-				]);
 			}
 		}
 
@@ -193,13 +189,18 @@ class Category
 		}
 	}
 
-	public static function storeFileByURIId(int $uri_id, int $uid, int $type, string $file)
+	public static function storeFileByURIId(int $uri_id, int $uid, int $type, string $file, string $url = ''): bool
 	{
-		$tagid = Tag::getID($file);
+		$tagid = Tag::getID($file, $url);
 		if (empty($tagid)) {
 			return false;
 		}
 
+		return self::storeByURIId($uri_id, $uid, $type, $tagid);
+	}
+
+	private static function storeByURIId(int $uri_id, int $uid, int $type, int $tagid): bool
+	{
 		return DBA::replace('post-category', [
 			'uri-id' => $uri_id,
 			'uid' => $uid,

src/Model/Tag.php

@@ -828,12 +828,13 @@ class Tag
 	public static function getUIDListByURIId(int $uriId): array
 	{
 		$uids = [];
-		$tags = self::getByURIId($uriId, [self::HASHTAG]);
 
-		foreach ($tags as $tag) {
+		foreach (self::getByURIId($uriId, [self::HASHTAG]) as $tag) {
-			$uids = array_merge($uids, self::getUIDListByTag(self::TAG_CHARACTER[self::HASHTAG] . $tag['name']));
+			foreach (self::getUIDListByTag(self::TAG_CHARACTER[self::HASHTAG] . $tag['name']) as $uid) {
+				$uids[$uid][] = $tag['name'];
+			} 
 		}
 
-		return array_unique($uids);
+		return $uids;
 	}
 }