friendica-github/src/Model/FileTag.php

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<?php
/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
* @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;
/**
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* This class handles FileTag related functions
*
* post categories and "save to file" use the same item.file table for storage.
* We will differentiate the different uses by wrapping categories in angle brackets
* and save to file categories in square brackets.
* To do this we need to escape these characters if they appear in our tag.
*/
class FileTag
{
/**
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* URL encode <, >, left and right brackets
*
* @param string $s String to be URL encoded.
*
* @return string The URL encoded string.
*/
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private static function encode($s)
{
return str_replace(['<', '>', '[', ']'], ['%3c', '%3e', '%5b', '%5d'], $s);
}
/**
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* URL decode <, >, left and right brackets
*
* @param string $s The URL encoded string to be decoded
*
* @return string The decoded string.
*/
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private static function decode($s)
{
return str_replace(['%3c', '%3e', '%5b', '%5d'], ['<', '>', '[', ']'], $s);
}
/**
* Get file tags from array
*
* ex. given [music,video] return <music><video> or [music][video]
*
* @param array $array A list of tags.
* @param string $type Optional file type.
*
* @return string A list of file tags.
*/
public static function arrayToFile(array $array, string $type = 'file')
{
$tag_list = '';
if ($type == 'file') {
$lbracket = '[';
$rbracket = ']';
} else {
$lbracket = '<';
$rbracket = '>';
}
foreach ($array as $item) {
if (strlen($item)) {
$tag_list .= $lbracket . self::encode(trim($item)) . $rbracket;
}
}
return $tag_list;
}
/**
* Get tag list from file tags
*
* ex. given <music><video>[friends], return [music,video] or [friends]
*
* @param string $file File tags
* @param string $type Optional file type.
*
* @return array List of tag names.
*/
public static function fileToArray(string $file, string $type = 'file')
{
$matches = [];
$return = [];
if ($type == 'file') {
$cnt = preg_match_all('/\[(.*?)\]/', $file, $matches, PREG_SET_ORDER);
} else {
$cnt = preg_match_all('/<(.*?)>/', $file, $matches, PREG_SET_ORDER);
}
if ($cnt) {
foreach ($matches as $match) {
$return[] = self::decode($match[1]);
}
}
return $return;
}
}