125 lines
3.1 KiB
PHP
125 lines
3.1 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\Util;
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use Friendica\Model\Group;
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/**
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* Util class for ACL formatting
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*/
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final class ACLFormatter
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{
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/**
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* Turn user/group ACLs stored as angle bracketed text into arrays
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*
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* @param string|null $acl_string A angle-bracketed list of IDs
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*
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* @return array The array based on the IDs (empty in case there is no list)
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*/
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public function expand(string $acl_string = null)
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{
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// In case there is no ID list, return empty array (=> no ACL set)
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if (empty($acl_string)) {
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return [];
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}
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// turn string array of angle-bracketed elements into numeric array
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// e.g. "<1><2><3>" => array(1,2,3);
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preg_match_all('/<(' . Group::FOLLOWERS . '|'. Group::MUTUALS . '|[0-9]+)>/', $acl_string, $matches, PREG_PATTERN_ORDER);
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return $matches[1];
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}
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/**
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* Takes an arbitrary ACL string and sanitizes it for storage
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*
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* @param string|null $acl_string
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* @return string
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*/
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public function sanitize(string $acl_string = null)
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{
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if (empty($acl_string)) {
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return '';
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}
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$cleaned_list = trim($acl_string, '<>');
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if (empty($cleaned_list)) {
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return '';
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}
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$elements = explode('><', $cleaned_list);
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sort($elements);
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array_walk($elements, [$this, 'sanitizeItem']);
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return implode('', $elements);
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}
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/**
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* Wrap ACL elements in angle brackets for storage
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*
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* @param string $item The item to sanitise
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*/
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private function sanitizeItem(string &$item) {
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// The item is an ACL int value
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if (intval($item)) {
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$item = '<' . intval($item) . '>';
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// The item is a allowed ACL character
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} elseif (in_array($item, [Group::FOLLOWERS, Group::MUTUALS])) {
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$item = '<' . $item . '>';
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// The item is already a ACL string
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} elseif (preg_match('/<\d+?>/', $item)) {
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unset($item);
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// The item is not supported, so remove it (cleanup)
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} else {
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$item = '';
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}
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}
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/**
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* Convert an ACL array to a storable string
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*
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* Normally ACL permissions will be an array.
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* We'll also allow a comma-separated string.
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*
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* @param string|array $permissions
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*
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* @return string
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*/
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function toString($permissions) {
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$return = '';
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if (is_array($permissions)) {
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$item = $permissions;
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} else {
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$item = explode(',', $permissions);
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}
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if (is_array($item)) {
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array_walk($item, [$this, 'sanitizeItem']);
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$return = implode('', $item);
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}
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return $return;
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}
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}
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