117 lines
3 KiB
PHP
117 lines
3 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2022, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program 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 as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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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
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Model;
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/**
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* This class handles FileTag related functions
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*
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* post categories and "save to file" use the same item.file table for storage.
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* We will differentiate the different uses by wrapping categories in angle brackets
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* and save to file categories in square brackets.
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* To do this we need to escape these characters if they appear in our tag.
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*/
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class FileTag
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{
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/**
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* URL encode <, >, left and right brackets
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*
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* @param string $s String to be URL encoded.
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*
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* @return string The URL encoded string.
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*/
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private static function encode($s)
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{
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return str_replace(['<', '>', '[', ']'], ['%3c', '%3e', '%5b', '%5d'], $s);
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}
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/**
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* URL decode <, >, left and right brackets
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*
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* @param string $s The URL encoded string to be decoded
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*
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* @return string The decoded string.
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*/
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private static function decode($s)
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{
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return str_replace(['%3c', '%3e', '%5b', '%5d'], ['<', '>', '[', ']'], $s);
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}
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/**
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* Get file tags from array
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*
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* ex. given [music,video] return <music><video> or [music][video]
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*
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* @param array $array A list of tags.
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* @param string $type Optional file type.
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*
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* @return string A list of file tags.
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*/
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public static function arrayToFile(array $array, string $type = 'file')
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{
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$tag_list = '';
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if ($type == 'file') {
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$lbracket = '[';
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$rbracket = ']';
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} else {
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$lbracket = '<';
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$rbracket = '>';
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}
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foreach ($array as $item) {
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if (strlen($item)) {
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$tag_list .= $lbracket . self::encode(trim($item)) . $rbracket;
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}
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}
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return $tag_list;
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}
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/**
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* Get tag list from file tags
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*
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* ex. given <music><video>[friends], return [music,video] or [friends]
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*
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* @param string $file File tags
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* @param string $type Optional file type.
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*
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* @return array List of tag names.
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*/
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public static function fileToArray(string $file, string $type = 'file')
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{
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$matches = [];
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$return = [];
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if ($type == 'file') {
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$cnt = preg_match_all('/\[(.*?)\]/', $file, $matches, PREG_SET_ORDER);
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} else {
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$cnt = preg_match_all('/<(.*?)>/', $file, $matches, PREG_SET_ORDER);
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}
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if ($cnt) {
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foreach ($matches as $match) {
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$return[] = self::decode($match[1]);
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}
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}
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return $return;
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}
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}
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