149 lines
3.9 KiB
PHP
149 lines
3.9 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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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\Database\DBA;
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use Friendica\Model\Contact;
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use Friendica\Model\Group;
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use Friendica\Model\User;
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use Friendica\Core\Session;
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/**
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* Secures that User is allow to do requests
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*/
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class Security
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{
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public static function canWriteToUserWall($owner)
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{
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static $verified = 0;
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if (!Session::isAuthenticated()) {
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return false;
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}
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$uid = local_user();
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if ($uid == $owner) {
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return true;
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}
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if (local_user() && ($owner == 0)) {
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return true;
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}
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if (!empty(Session::getRemoteContactID($owner))) {
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// use remembered decision and avoid a DB lookup for each and every display item
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// DO NOT use this function if there are going to be multiple owners
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// We have a contact-id for an authenticated remote user, this block determines if the contact
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// belongs to this page owner, and has the necessary permissions to post content
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if ($verified === 2) {
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return true;
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} elseif ($verified === 1) {
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return false;
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} else {
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$cid = Session::getRemoteContactID($owner);
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if (!$cid) {
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return false;
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}
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$r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` INNER JOIN `user` on `user`.`uid` = `contact`.`uid`
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WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0
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AND `user`.`blockwall` = 0 AND `readonly` = 0 AND (`contact`.`rel` IN (%d , %d) OR `user`.`page-flags` = %d) LIMIT 1",
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intval($owner),
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intval($cid),
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intval(Contact::SHARING),
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intval(Contact::FRIEND),
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intval(User::PAGE_FLAGS_COMMUNITY)
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);
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if (DBA::isResult($r)) {
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$verified = 2;
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return true;
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} else {
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$verified = 1;
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}
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}
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}
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return false;
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}
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/**
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* Create a permission string for an element based on the visitor
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*
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* @param integer $owner_id User ID of the owner of the element
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* @param boolean $accessible Should the element be accessible anyway?
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* @return string SQL permissions
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*/
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public static function getPermissionsSQLByUserId(int $owner_id, bool $accessible = false)
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{
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$local_user = local_user();
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$remote_contact = Session::getRemoteContactID($owner_id);
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$acc_sql = '';
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if ($accessible) {
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$acc_sql = ' OR `accessible`';
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}
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/*
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* Construct permissions
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*
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* default permissions - anonymous user
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*/
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$sql = " AND (allow_cid = ''
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AND allow_gid = ''
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AND deny_cid = ''
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AND deny_gid = ''" . $acc_sql . ") ";
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/*
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* Profile owner - everything is visible
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*/
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if ($local_user && $local_user == $owner_id) {
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$sql = '';
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/*
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* Authenticated visitor. Load the groups the visitor belongs to.
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*/
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} elseif ($remote_contact) {
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$gs = '<<>>'; // should be impossible to match
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$groups = Group::getIdsByContactId($remote_contact);
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if (is_array($groups)) {
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foreach ($groups as $g) {
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$gs .= '|<' . intval($g) . '>';
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}
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}
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$sql = sprintf(
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" AND (NOT (deny_cid REGEXP '<%d>' OR deny_gid REGEXP '%s')
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AND (allow_cid REGEXP '<%d>' OR allow_gid REGEXP '%s'
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OR (allow_cid = '' AND allow_gid = ''))" . $acc_sql . ") ",
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intval($remote_contact),
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DBA::escape($gs),
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intval($remote_contact),
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DBA::escape($gs)
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);
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}
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return $sql;
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}
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}
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