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<?php
/**
* @author Joas Schilling <nickvergessen@gmx.de>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\Files\Service;
use OC\Files\FileInfo;
/**
* Service class to manage tags on files.
*/
class TagService {
/**
* @var \OCP\IUserSession
*/
private $userSession;
/**
* @var \OCP\ITags
*/
private $tagger;
/**
* @var \OCP\Files\Folder
*/
private $homeFolder;
public function __construct(
\OCP\IUserSession $userSession,
\OCP\ITags $tagger,
\OCP\Files\Folder $homeFolder
) {
$this->userSession = $userSession;
$this->tagger = $tagger;
$this->homeFolder = $homeFolder;
}
/**
* Updates the tags of the specified file path.
* The passed tags are absolute, which means they will
* replace the actual tag selection.
*
* @param string $path path
* @param array $tags array of tags
* @return array list of tags
* @throws \OCP\NotFoundException if the file does not exist
*/
public function updateFileTags($path, $tags) {
$fileId = $this->homeFolder->get($path)->getId();
$currentTags = $this->tagger->getTagsForObjects(array($fileId));
if (!empty($currentTags)) {
$currentTags = current($currentTags);
}
$newTags = array_diff($tags, $currentTags);
foreach ($newTags as $tag) {
$this->tagger->tagAs($fileId, $tag);
}
$deletedTags = array_diff($currentTags, $tags);
foreach ($deletedTags as $tag) {
$this->tagger->unTag($fileId, $tag);
}
// TODO: re-read from tagger to make sure the
// list is up to date, in case of concurrent changes ?
return $tags;
}
/**
* Updates the tags of the specified file path.
* The passed tags are absolute, which means they will
* replace the actual tag selection.
*
* @param array $tagName tag name to filter by
* @return FileInfo[] list of matching files
* @throws \Exception if the tag does not exist
*/
public function getFilesByTag($tagName) {
$nodes = $this->homeFolder->searchByTag(
$tagName, $this->userSession->getUser()->getUId()
);
$fileInfos = [];
foreach ($nodes as $node) {
try {
/** @var \OC\Files\Node\Node $node */
$fileInfos[] = $node->getFileInfo();
} catch (\Exception $e) {
// FIXME Should notify the user, when this happens
// Can not get FileInfo, maybe the connection to the external
// storage is interrupted.
}
}
return $fileInfos;
}
}
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