feat: specify media type via url path: systemtags-current/$mediaType

- only the media part of the mime type can be search, but not the full
  mime type. It can be added, should it become necessary.
- thus fixes previously hardcoded selector for image/ types
- also fixes a return type hint
- adds a return type hint

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

apps/dav/lib/SystemTag/SystemTagsInUseCollection.php

@@ -31,29 +31,42 @@
 use OCP\IUserSession;
 use OCP\SystemTag\ISystemTagManager;
 use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Exception\NotFound;
 
 class SystemTagsInUseCollection extends \Sabre\DAV\SimpleCollection {
 	protected IUserSession $userSession;
 	protected IRootFolder $rootFolder;
+	protected string $mediaType;
 
-	public function __construct(IUserSession $userSession, IRootFolder $rootFolder) {
+	public function __construct(IUserSession $userSession, IRootFolder $rootFolder, string $mediaType = '') {
 		$this->userSession = $userSession;
 		$this->rootFolder = $rootFolder;
+		$this->mediaType = $mediaType;
 		$this->name = 'systemtags-current';
+		if ($this->mediaType != '') {
+			$this->name .= '/' . $this->mediaType;
+		}
 	}
 
 	public function setName($name): void {
 		throw new Forbidden('Permission denied to rename this collection');
 	}
 
+	public function getChild($name) {
+		if ($this->mediaType !== '') {
+			throw new NotFound('Invalid media type');
+		}
+		return new self($this->userSession, $this->rootFolder, $name);
+	}
+
 	public function getChildren() {
 		$user = $this->userSession->getUser();
 		if ($user === null) {
 			throw new Forbidden('Permission denied to read this collection');
 		}
 
 		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
-		$result = $userFolder->getSystemTags('image');
+		$result = $userFolder->getSystemTags($this->mediaType);
 		$children = [];
 		foreach ($result as $tagData) {
 			$tag = new SystemTag((string)$tagData['id'], $tagData['name'], (bool)$tagData['visibility'], (bool)$tagData['editable']);

lib/private/Files/Cache/QuerySearchHelper.php

@@ -98,6 +98,10 @@ protected function applySearchConstraints(CacheQueryBuilder $query, ISearchQuery
 		}
 	}
 
+
+	/**
+	 * @return array<array-key, array{id: int, name: string, visibility: int, editable: int, ref_file_id: int, number_files: int}>
+	 */
 	public function findUsedTagsInCaches(ISearchQuery $searchQuery, array $caches): array {
 		$query = $this->getQueryBuilder();
 		$query->selectTagUsage();

lib/private/Files/Node/Folder.php

@@ -343,10 +343,17 @@ public function searchBySystemTag(string $tag, string $userId, int $limit = 0, i
 	}
 
 	/**
-	 * @return Node[]
+	 *
+	 * @return array<array-key, array{id: int, name: string, visibility: int, editable: int, ref_file_id: int, number_files: int}>
 	 */
 	public function getSystemTags(string $mediaType, int $limit = 0, int $offset = 0): array {
-		$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_LIKE, 'mimetype', $mediaType . '/%'), null, $limit, $offset);
+		// Currently query has to have exactly one search condition. If no media type is provided,
+		// we fall back to the presence of a systemtag.
+		if (empty($mediaType)) {
+			$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_LIKE, 'systemtag', '%'), null, $limit, $offset);
+		} else {
+			$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_LIKE, 'mimetype', $mediaType . '/%'), null, $limit, $offset);
+		}
 		[$caches, ] = $this->getCachesAndMountpointsForSearch();
 		/** @var QuerySearchHelper $searchHelper */
 		$searchHelper = \OCP\Server::get(QuerySearchHelper::class);