use efficient tag retrieval on DAV report request

- uses DAV search approach against valid files joined by systemtag selector
- reduced table join for tag/systemtag search
- supports pagination
- no changes to the output formats or similar

Example request body:

<?xml version="1.0"?>
<oc:filter-files xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns" xmlns:nc="http://nextcloud.org/ns" xmlns:ocs="http://open-collaboration-services.org/ns">
  <d:prop>
    <d:getcontentlength/>
    <d:getcontenttype/>
    <d:getetag/>
    <d:getlastmodified/>
    <d:resourcetype/>
    <nc:face-detections/>
    <nc:file-metadata-size/>
    <nc:has-preview/>
    <nc:realpath/>
    <oc:favorite/>
    <oc:fileid/>
    <oc:permissions/>
    <nc:nbItems/>
  </d:prop>
  <oc:filter-rules>
    <oc:systemtag>32</oc:systemtag>
  </oc:filter-rules>
  <d:limit>
    <d:nresults>50</d:nresults>
    <nc:firstresult>0</nc:firstresult>
  </d:limit>
</oc:filter-files>

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

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/private/Files/Node/Folder.php b/lib/private/Files/Node/Folder.php
index 44f47e92ca0..f0c0cefd783 100644
--- a/lib/private/Files/Node/Folder.php
+++ b/lib/private/Files/Node/Folder.php
@@ -300,7 +300,12 @@ class Folder extends Node implements \OCP\Files\Folder {
 	 * @return Node[]
 	 */
 	public function searchByTag($tag, $userId) {
-		$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_EQUAL, 'tagname', $tag), $userId);
+		$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_EQUAL, 'tag', $tag), $userId);
+		return $this->search($query);
+	}
+
+	public function searchBySystemTag(string $tag, string $userId, int $limit = 0, int $offset = 0): array {
+		$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_EQUAL, 'systemtag', $tag), $userId, $limit, $offset);
 		return $this->search($query);
 	}