fix(dav): Allow apps to get unshares for DAV resources

Signed-off-by: Joas Schilling <coding@schilljs.com>

apps/dav/lib/DAV/Sharing/SharingMapper.php

@@ -14,21 +14,34 @@ class SharingMapper {
 	public function __construct(private IDBConnection $db) {
 	}
 
-	public function getSharesForId(int $resourceId, string $resourceType): array {
+	protected function getSharesForIdByAccess(int $resourceId, string $resourceType, bool $sharesWithAccess): array {
 		$query = $this->db->getQueryBuilder();
-		$result = $query->select(['principaluri', 'access'])
+		$query->select(['principaluri', 'access'])
 			->from('dav_shares')
 			->where($query->expr()->eq('resourceid', $query->createNamedParameter($resourceId, IQueryBuilder::PARAM_INT)))
 			->andWhere($query->expr()->eq('type', $query->createNamedParameter($resourceType, IQueryBuilder::PARAM_STR)))
-			->andWhere($query->expr()->neq('access', $query->createNamedParameter(Backend::ACCESS_UNSHARED, IQueryBuilder::PARAM_INT)))
-			->groupBy(['principaluri', 'access'])
-			->executeQuery();
+			->groupBy(['principaluri', 'access']);
 
+		if ($sharesWithAccess) {
+			$query->andWhere($query->expr()->neq('access', $query->createNamedParameter(Backend::ACCESS_UNSHARED, IQueryBuilder::PARAM_INT)));
+		} else {
+			$query->andWhere($query->expr()->eq('access', $query->createNamedParameter(Backend::ACCESS_UNSHARED, IQueryBuilder::PARAM_INT)));
+		}
+
+		$result = $query->executeQuery();
 		$rows = $result->fetchAll();
 		$result->closeCursor();
 		return $rows;
 	}
 
+	public function getSharesForId(int $resourceId, string $resourceType): array {
+		return $this->getSharesForIdByAccess($resourceId, $resourceType, true);
+	}
+
+	public function getUnsharesForId(int $resourceId, string $resourceType): array {
+		return $this->getSharesForIdByAccess($resourceId, $resourceType, false);
+	}
+
 	public function getSharesForIds(array $resourceIds, string $resourceType): array {
 		$query = $this->db->getQueryBuilder();
 		$result = $query->select(['resourceid', 'principaluri', 'access'])

apps/dav/lib/DAV/Sharing/SharingService.php

@@ -41,6 +41,10 @@ abstract class SharingService {
 		return $this->mapper->getSharesForId($resourceId, $this->getResourceType());
 	}
 
+	public function getUnshares(int $resourceId): array {
+		return $this->mapper->getUnsharesForId($resourceId, $this->getResourceType());
+	}
+
 	public function getSharesForIds(array $resourceIds): array {
 		return $this->mapper->getSharesForIds($resourceIds, $this->getResourceType());
 	}