friendica/src/Model/Post/Category.php

<?php
/**
 * @copyright Copyright (C) 2020, Friendica
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * 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
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

namespace Friendica\Model\Post;

use Friendica\Database\DBA;
use Friendica\Model\Item;
use Friendica\Model\Post;
use Friendica\Model\Tag;

/**
 * Class Category
 *
 * This Model class handles category table interactions.
 * This tables stores user-applied categories related to posts.
 */
class Category
{
    const UNKNOWN           = 0;
    const CATEGORY          = 3;
    const FILE              = 5;

	/**
	 * Generates the legacy item.file field string from an item ID.
	 * Includes only file and category terms.
	 *
	 * @param int $item_id
	 * @return string
	 * @throws \Exception
	 */
	public static function getTextByURIId(int $uri_id, int $uid)
	{
		$file_text = '';

		$tags = DBA::selectToArray('category-view', ['type', 'name'], ['uri-id' => $uri_id, 'uid' => $uid]);
		foreach ($tags as $tag) {
			if ($tag['type'] == self::CATEGORY) {
				$file_text .= '<' . $tag['name'] . '>';
			} else {
				$file_text .= '[' . $tag['name'] . ']';
			}
		}

		return $file_text;
	}

	/**
	 * Inserts new terms for the provided item ID based on the legacy item.file field BBCode content.
	 * Deletes all previous file terms for the same item ID.
	 *
	 * @param integer $item_id item id
	 * @param         $files
	 * @return void
	 * @throws \Exception
	 */
	public static function storeTextByURIId(int $uri_id, int $uid, string $files)
	{
		$message = Post::selectFirst(['deleted'], ['uri-id' => $uri_id, 'uid' => $uid]);
		if (DBA::isResult($message)) {
			// Clean up all tags
			DBA::delete('post-category', ['uri-id' => $uri_id, 'uid' => $uid]);

			if ($message['deleted']) {
				return;
			}
		}

		if (preg_match_all("/\[(.*?)\]/ism", $files, $result)) {
			foreach ($result[1] as $file) {
				$tagid = Tag::getID($file);
				if (empty($tagid)) {
					continue;
				}

				DBA::replace('post-category', [
					'uri-id' => $uri_id,
					'uid' => $uid,
					'type' => self::FILE,
					'tid' => $tagid
				]);
			}
		}

		if (preg_match_all("/\<(.*?)\>/ism", $files, $result)) {
			foreach ($result[1] as $file) {
				$tagid = Tag::getID($file);
				if (empty($tagid)) {
					continue;
				}

				DBA::replace('post-category', [
					'uri-id' => $uri_id,
					'uid' => $uid,
					'type' => self::CATEGORY,
					'tid' => $tagid
				]);
			}
		}
	}
}