568 lines
16 KiB
PHP
568 lines
16 KiB
PHP
<?php
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/**
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* @author Arthur Schiwon <blizzz@owncloud.com>
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*
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Comments;
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use Doctrine\DBAL\Exception\DriverException;
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use OCP\Comments\IComment;
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use OCP\Comments\ICommentsManager;
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use OCP\Comments\NotFoundException;
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use OCP\IDBConnection;
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use OCP\ILogger;
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class Manager implements ICommentsManager {
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/** @var IDBConnection */
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protected $dbConn;
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/** @var ILogger */
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protected $logger;
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/** @var IComment[] */
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protected $commentsCache = [];
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public function __construct(
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IDBConnection $dbConn,
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ILogger $logger
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) {
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$this->dbConn = $dbConn;
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$this->logger = $logger;
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}
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/**
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* converts data base data into PHP native, proper types as defined by
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* IComment interface.
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*
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* @param array $data
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* @return array
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*/
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protected function normalizeDatabaseData(array $data) {
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$data['id'] = strval($data['id']);
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$data['parent_id'] = strval($data['parent_id']);
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$data['topmost_parent_id'] = strval($data['topmost_parent_id']);
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$data['creation_timestamp'] = new \DateTime($data['creation_timestamp']);
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$data['latest_child_timestamp'] = new \DateTime($data['latest_child_timestamp']);
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$data['children_count'] = intval($data['children_count']);
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return $data;
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}
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/**
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* prepares a comment for an insert or update operation after making sure
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* all necessary fields have a value assigned.
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*
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* @param IComment $comment
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* @return IComment returns the same updated IComment instance as provided
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* by parameter for convenience
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* @throws \UnexpectedValueException
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*/
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protected function prepareCommentForDatabaseWrite(IComment $comment) {
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if( !$comment->getActorType()
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|| !$comment->getActorId()
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|| !$comment->getObjectType()
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|| !$comment->getObjectId()
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|| !$comment->getVerb()
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) {
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throw new \UnexpectedValueException('Actor, Object and Verb information must be provided for saving');
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}
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if($comment->getId() === '') {
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$comment->setChildrenCount(0);
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$comment->setLatestChildDateTime(new \DateTime('0000-00-00 00:00:00', new \DateTimeZone('UTC')));
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$comment->setLatestChildDateTime(null);
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}
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if(is_null($comment->getCreationDateTime())) {
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$comment->setCreationDateTime(new \DateTime());
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}
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if($comment->getParentId() !== '0') {
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$comment->setTopmostParentId($this->determineTopmostParentId($comment->getParentId()));
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} else {
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$comment->setTopmostParentId('0');
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}
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$this->cache($comment);
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return $comment;
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}
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/**
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* returns the topmost parent id of a given comment identified by ID
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*
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* @param string $id
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* @return string
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* @throws NotFoundException
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*/
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protected function determineTopmostParentId($id) {
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$comment = $this->get($id);
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if($comment->getParentId() === '0') {
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return $comment->getId();
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} else {
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return $this->determineTopmostParentId($comment->getId());
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}
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}
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/**
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* updates child information of a comment
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*
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* @param string $id
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* @param \DateTime $cDateTime the date time of the most recent child
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* @throws NotFoundException
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*/
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protected function updateChildrenInformation($id, \DateTime $cDateTime) {
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$qb = $this->dbConn->getQueryBuilder();
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$query = $qb->select($qb->createFunction('COUNT(`id`)'))
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->from('comments')
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->where($qb->expr()->eq('parent_id', $qb->createParameter('id')))
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->setParameter('id', $id);
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$resultStatement = $query->execute();
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$data = $resultStatement->fetch(\PDO::FETCH_NUM);
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$resultStatement->closeCursor();
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$children = intval($data[0]);
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$comment = $this->get($id);
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$comment->setChildrenCount($children);
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$comment->setLatestChildDateTime($cDateTime);
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$this->save($comment);
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}
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/**
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* Tests whether actor or object type and id parameters are acceptable.
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* Throws exception if not.
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*
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* @param string $role
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* @param string $type
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* @param string $id
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* @throws \InvalidArgumentException
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*/
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protected function checkRoleParameters($role, $type, $id) {
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if(
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!is_string($type) || empty($type)
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|| !is_string($id) || empty($id)
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) {
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throw new \InvalidArgumentException($role . ' parameters must be string and not empty');
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}
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}
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/**
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* run-time caches a comment
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*
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* @param IComment $comment
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*/
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protected function cache(IComment $comment) {
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$id = $comment->getId();
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if(empty($id)) {
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return;
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}
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$this->commentsCache[strval($id)] = $comment;
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}
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/**
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* removes an entry from the comments run time cache
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*
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* @param mixed $id the comment's id
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*/
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protected function uncache($id) {
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$id = strval($id);
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if (isset($this->commentsCache[$id])) {
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unset($this->commentsCache[$id]);
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}
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}
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/**
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* returns a comment instance
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*
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* @param string $id the ID of the comment
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* @return IComment
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* @throws NotFoundException
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* @throws \InvalidArgumentException
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* @since 9.0.0
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*/
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public function get($id) {
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if(intval($id) === 0) {
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throw new \InvalidArgumentException('IDs must be translatable to a number in this implementation.');
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}
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if(isset($this->commentsCache[$id])) {
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return $this->commentsCache[$id];
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}
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$qb = $this->dbConn->getQueryBuilder();
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$resultStatement = $qb->select('*')
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->from('comments')
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->where($qb->expr()->eq('id', $qb->createParameter('id')))
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->setParameter('id', $id, \PDO::PARAM_INT)
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->execute();
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$data = $resultStatement->fetch();
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$resultStatement->closeCursor();
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if(!$data) {
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throw new NotFoundException();
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}
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$comment = new Comment($this->normalizeDatabaseData($data));
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$this->cache($comment);
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return $comment;
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}
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/**
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* returns the comment specified by the id and all it's child comments.
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* At this point of time, we do only support one level depth.
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*
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* @param string $id
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* @param int $limit max number of entries to return, 0 returns all
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* @param int $offset the start entry
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* @return array
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* @since 9.0.0
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*
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* The return array looks like this
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* [
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* 'comment' => IComment, // root comment
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* 'replies' =>
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* [
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* 0 =>
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* [
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* 'comment' => IComment,
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* 'replies' => []
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* ]
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* 1 =>
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* [
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* 'comment' => IComment,
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* 'replies'=> []
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* ],
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* …
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* ]
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* ]
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*/
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public function getTree($id, $limit = 0, $offset = 0) {
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$tree = [];
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$tree['comment'] = $this->get($id);
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$tree['replies'] = [];
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$qb = $this->dbConn->getQueryBuilder();
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$query = $qb->select('*')
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->from('comments')
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->where($qb->expr()->eq('topmost_parent_id', $qb->createParameter('id')))
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->orderBy('creation_timestamp', 'DESC')
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->setParameter('id', $id);
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if($limit > 0) {
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$query->setMaxResults($limit);
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}
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if($offset > 0) {
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$query->setFirstResult($offset);
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}
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$resultStatement = $query->execute();
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while($data = $resultStatement->fetch()) {
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$comment = new Comment($this->normalizeDatabaseData($data));
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$this->cache($comment);
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$tree['replies'][] = [
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'comment' => $comment,
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'replies' => []
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];
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}
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$resultStatement->closeCursor();
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return $tree;
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}
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/**
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* returns comments for a specific object (e.g. a file).
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*
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* The sort order is always newest to oldest.
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*
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* @param string $objectType the object type, e.g. 'files'
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* @param string $objectId the id of the object
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* @param int $limit optional, number of maximum comments to be returned. if
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* not specified, all comments are returned.
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* @param int $offset optional, starting point
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* @param \DateTime $notOlderThan optional, timestamp of the oldest comments
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* that may be returned
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* @return IComment[]
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* @since 9.0.0
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*/
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public function getForObject(
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$objectType,
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$objectId,
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$limit = 0,
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$offset = 0,
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\DateTime $notOlderThan = null
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) {
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$comments = [];
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$qb = $this->dbConn->getQueryBuilder();
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$query = $qb->select('*')
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->from('comments')
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->where($qb->expr()->eq('object_type', $qb->createParameter('type')))
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->andWhere($qb->expr()->eq('object_id', $qb->createParameter('id')))
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->orderBy('creation_timestamp', 'DESC')
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->setParameter('type', $objectType)
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->setParameter('id', $objectId);
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if($limit > 0) {
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$query->setMaxResults($limit);
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}
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if($offset > 0) {
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$query->setFirstResult($offset);
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}
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if(!is_null($notOlderThan)) {
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$query
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->andWhere($qb->expr()->gt('creation_timestamp', $qb->createParameter('notOlderThan')))
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->setParameter('notOlderThan', $notOlderThan, 'datetime');
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}
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$resultStatement = $query->execute();
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while($data = $resultStatement->fetch()) {
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$comment = new Comment($this->normalizeDatabaseData($data));
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$this->cache($comment);
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$comments[] = $comment;
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}
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$resultStatement->closeCursor();
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return $comments;
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}
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/**
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* @param $objectType string the object type, e.g. 'files'
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* @param $objectId string the id of the object
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* @return Int
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* @since 9.0.0
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*/
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public function getNumberOfCommentsForObject($objectType, $objectId) {
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$qb = $this->dbConn->getQueryBuilder();
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$query = $qb->select($qb->createFunction('COUNT(`id`)'))
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->from('comments')
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->where($qb->expr()->eq('object_type', $qb->createParameter('type')))
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->andWhere($qb->expr()->eq('object_id', $qb->createParameter('id')))
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->setParameter('type', $objectType)
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->setParameter('id', $objectId);
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$resultStatement = $query->execute();
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$data = $resultStatement->fetch(\PDO::FETCH_NUM);
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$resultStatement->closeCursor();
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return intval($data[0]);
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}
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/**
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* creates a new comment and returns it. At this point of time, it is not
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* saved in the used data storage. Use save() after setting other fields
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* of the comment (e.g. message or verb).
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*
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* @param string $actorType the actor type (e.g. 'user')
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* @param string $actorId a user id
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* @param string $objectType the object type the comment is attached to
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* @param string $objectId the object id the comment is attached to
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* @return IComment
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* @since 9.0.0
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*/
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public function create($actorType, $actorId, $objectType, $objectId) {
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$comment = new Comment();
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$comment
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->setActor($actorType, $actorId)
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->setObject($objectType, $objectId);
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return $comment;
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}
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/**
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* permanently deletes the comment specified by the ID
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*
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* When the comment has child comments, their parent ID will be changed to
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* the parent ID of the item that is to be deleted.
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*
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* @param string $id
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* @return bool
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* @throws \InvalidArgumentException
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* @since 9.0.0
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*/
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public function delete($id) {
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if(!is_string($id)) {
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throw new \InvalidArgumentException('Parameter must be string');
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}
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$qb = $this->dbConn->getQueryBuilder();
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$query = $qb->delete('comments')
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->where($qb->expr()->eq('id', $qb->createParameter('id')))
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->setParameter('id', $id);
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try {
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$affectedRows = $query->execute();
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$this->uncache($id);
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} catch (DriverException $e) {
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$this->logger->logException($e, ['app' => 'core_comments']);
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return false;
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}
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return ($affectedRows > 0);
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}
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/**
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* saves the comment permanently and returns it
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*
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* if the supplied comment has an empty ID, a new entry comment will be
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* saved and the instance updated with the new ID.
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*
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* Otherwise, an existing comment will be updated.
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*
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* Throws NotFoundException when a comment that is to be updated does not
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* exist anymore at this point of time.
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*
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* @param IComment $comment
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* @return bool
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* @throws NotFoundException
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* @since 9.0.0
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*/
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public function save(IComment $comment) {
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if($this->prepareCommentForDatabaseWrite($comment)->getId() === '') {
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$result = $this->insert($comment);
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} else {
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$result = $this->update($comment);
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}
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if($result && !!$comment->getParentId()) {
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$this->updateChildrenInformation(
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$comment->getParentId(),
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$comment->getCreationDateTime()
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);
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$this->cache($comment);
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}
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return $result;
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}
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/**
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* inserts the provided comment in the database
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*
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* @param IComment $comment
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* @return bool
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*/
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protected function insert(IComment &$comment) {
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$qb = $this->dbConn->getQueryBuilder();
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$affectedRows = $qb
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->insert('comments')
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->values([
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'parent_id' => $qb->createNamedParameter($comment->getParentId()),
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'topmost_parent_id' => $qb->createNamedParameter($comment->getTopmostParentId()),
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'children_count' => $qb->createNamedParameter($comment->getChildrenCount()),
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'actor_type' => $qb->createNamedParameter($comment->getActorType()),
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'actor_id' => $qb->createNamedParameter($comment->getActorId()),
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'message' => $qb->createNamedParameter($comment->getMessage()),
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'verb' => $qb->createNamedParameter($comment->getVerb()),
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'creation_timestamp' => $qb->createNamedParameter($comment->getCreationDateTime(), 'datetime'),
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'latest_child_timestamp' => $qb->createNamedParameter($comment->getLatestChildDateTime(), 'datetime'),
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'object_type' => $qb->createNamedParameter($comment->getObjectType()),
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'object_id' => $qb->createNamedParameter($comment->getObjectId()),
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])
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->execute();
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if ($affectedRows > 0) {
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$comment->setId(strval($qb->getLastInsertId()));
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}
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return $affectedRows > 0;
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}
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/**
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* updates a Comment data row
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*
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* @param IComment $comment
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* @return bool
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* @throws NotFoundException
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*/
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protected function update(IComment $comment) {
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$qb = $this->dbConn->getQueryBuilder();
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$affectedRows = $qb
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->update('comments')
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->set('parent_id', $qb->createNamedParameter($comment->getParentId()))
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->set('topmost_parent_id', $qb->createNamedParameter($comment->getTopmostParentId()))
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->set('children_count', $qb->createNamedParameter($comment->getChildrenCount()))
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->set('actor_type', $qb->createNamedParameter($comment->getActorType()))
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->set('actor_id', $qb->createNamedParameter($comment->getActorId()))
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->set('message', $qb->createNamedParameter($comment->getMessage()))
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->set('verb', $qb->createNamedParameter($comment->getVerb()))
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->set('creation_timestamp', $qb->createNamedParameter($comment->getCreationDateTime(), 'datetime'))
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->set('latest_child_timestamp', $qb->createNamedParameter($comment->getLatestChildDateTime(), 'datetime'))
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->set('object_type', $qb->createNamedParameter($comment->getObjectType()))
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->set('object_id', $qb->createNamedParameter($comment->getObjectId()))
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->where($qb->expr()->eq('id', $qb->createParameter('id')))
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->setParameter('id', $comment->getId())
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->execute();
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if($affectedRows === 0) {
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throw new NotFoundException('Comment to update does ceased to exist');
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}
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return $affectedRows > 0;
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}
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/**
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* removes references to specific actor (e.g. on user delete) of a comment.
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* The comment itself must not get lost/deleted.
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*
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* @param string $actorType the actor type (e.g. 'user')
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* @param string $actorId a user id
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* @return boolean
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* @since 9.0.0
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*/
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public function deleteReferencesOfActor($actorType, $actorId) {
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$this->checkRoleParameters('Actor', $actorType, $actorId);
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$qb = $this->dbConn->getQueryBuilder();
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$affectedRows = $qb
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->update('comments')
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->set('actor_type', $qb->createNamedParameter(ICommentsManager::DELETED_USER))
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|
->set('actor_id', $qb->createNamedParameter(ICommentsManager::DELETED_USER))
|
|
->where($qb->expr()->eq('actor_type', $qb->createParameter('type')))
|
|
->andWhere($qb->expr()->eq('actor_id', $qb->createParameter('id')))
|
|
->setParameter('type', $actorType)
|
|
->setParameter('id', $actorId)
|
|
->execute();
|
|
|
|
$this->commentsCache = [];
|
|
|
|
return is_int($affectedRows);
|
|
}
|
|
|
|
/**
|
|
* deletes all comments made of a specific object (e.g. on file delete)
|
|
*
|
|
* @param string $objectType the object type (e.g. 'file')
|
|
* @param string $objectId e.g. the file id
|
|
* @return boolean
|
|
* @since 9.0.0
|
|
*/
|
|
public function deleteCommentsAtObject($objectType, $objectId) {
|
|
$this->checkRoleParameters('Object', $objectType, $objectId);
|
|
|
|
$qb = $this->dbConn->getQueryBuilder();
|
|
$affectedRows = $qb
|
|
->delete('comments')
|
|
->where($qb->expr()->eq('object_type', $qb->createParameter('type')))
|
|
->andWhere($qb->expr()->eq('object_id', $qb->createParameter('id')))
|
|
->setParameter('type', $objectType)
|
|
->setParameter('id', $objectId)
|
|
->execute();
|
|
|
|
$this->commentsCache = [];
|
|
|
|
return is_int($affectedRows);
|
|
}
|
|
}
|