Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file /src/Util/Security.php
*/
namespace Friendica\Util;
use Friendica\BaseObject;
use Friendica\Database\DBA;
use Friendica\Model\Contact;
use Friendica\Model\Group;
use Friendica\Model\User;
/**
* Secures that User is allow to do requests
*/
class Security extends BaseObject
{
public static function canWriteToUserWall($owner)
{
static $verified = 0;
if (!local_user() && !remote_user()) {
return false;
}
$uid = local_user();
if ($uid == $owner) {
return true;
}
if (local_user() && ($owner == 0)) {
return true;
}
if (remote_user()) {
// use remembered decision and avoid a DB lookup for each and every display item
// DO NOT use this function if there are going to be multiple owners
// We have a contact-id for an authenticated remote user, this block determines if the contact
// belongs to this page owner, and has the necessary permissions to post content
if ($verified === 2) {
return true;
} elseif ($verified === 1) {
return false;
} else {
$cid = 0;
if (!empty($_SESSION['remote'])) {
foreach ($_SESSION['remote'] as $visitor) {
if ($visitor['uid'] == $owner) {
$cid = $visitor['cid'];
break;
}
}
}
if (!$cid) {
return false;
}
$r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` INNER JOIN `user` on `user`.`uid` = `contact`.`uid`
WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0
AND `user`.`blockwall` = 0 AND `readonly` = 0 AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
intval($owner),
intval($cid),
intval(Contact::SHARING),
intval(Contact::FRIEND),
intval(User::PAGE_FLAGS_COMMUNITY)
);
if (DBA::isResult($r)) {
$verified = 2;
return true;
} else {
$verified = 1;
}
}
}
return false;
}
/// @TODO $groups should be array
public static function getPermissionsSQLByUserId($owner_id, $remote_verified = false, $groups = null)
{
$local_user = local_user();
$remote_user = remote_user();
/*
* Construct permissions
*
* default permissions - anonymous user
*/
$sql = " AND allow_cid = ''
AND allow_gid = ''
AND deny_cid = ''
AND deny_gid = ''
";
/*
* Profile owner - everything is visible
*/
if ($local_user && $local_user == $owner_id) {
$sql = '';
/*
* Authenticated visitor. Unless pre-verified,
* check that the contact belongs to this $owner_id
* and load the groups the visitor belongs to.
* If pre-verified, the caller is expected to have already
* done this and passed the groups into this function.
*/
} elseif ($remote_user) {
/*
* Authenticated visitor. Unless pre-verified,
* check that the contact belongs to this $owner_id
* and load the groups the visitor belongs to.
* If pre-verified, the caller is expected to have already
* done this and passed the groups into this function.
*/
if (!$remote_verified) {
$cid = 0;
foreach (\Friendica\Core\Session::get('remote', []) as $visitor) {
if ($visitor['uid'] == $owner_id) {
$cid = $visitor['cid'];
break;
}
}
if ($cid && DBA::exists('contact', ['id' => $cid, 'uid' => $owner_id, 'blocked' => false])) {
$remote_verified = true;
$groups = Group::getIdsByContactId($cid);
}
}
if ($remote_verified) {
$gs = '<<>>'; // should be impossible to match
if (is_array($groups)) {
foreach ($groups as $g) {
$gs .= '|<' . intval($g) . '>';
}
}
$sql = sprintf(
" AND ( NOT (deny_cid REGEXP '<%d>' OR deny_gid REGEXP '%s')
AND ( allow_cid REGEXP '<%d>' OR allow_gid REGEXP '%s' OR ( allow_cid = '' AND allow_gid = '') )
)
",
intval($cid),
DBA::escape($gs),
intval($cid),
DBA::escape($gs)
);
}
}
return $sql;
}
}