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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Database-level access to tables which monitor rate limits
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
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 General Public License for more details.
More about this license: http://www.question2answer.org/license.php
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../../');
exit;
}
/**
* Get rate limit information for $action from the database for user $userid and/or IP address $ip, if they're set.
* Return as an array with the limit type in the key, and a labelled array of the period and count.
* @param $userid
* @param $ip
* @param $action
* @return array
*/
function qa_db_limits_get($userid, $ip, $action)
{
$selects = array();
$arguments = array();
if (isset($userid)) {
$selects[] = "(SELECT 'user' AS limitkey, period, count FROM ^userlimits WHERE userid=$ AND action=$)";
$arguments[] = $userid;
$arguments[] = $action;
}
if (isset($ip)) {
$selects[] = "(SELECT 'ip' AS limitkey, period, count FROM ^iplimits WHERE ip=UNHEX($) AND action=$)";
$arguments[] = bin2hex(@inet_pton($ip));
$arguments[] = $action;
}
if (count($selects)) {
$query = qa_db_apply_sub(implode(' UNION ALL ', $selects), $arguments);
return qa_db_read_all_assoc(qa_db_query_raw($query), 'limitkey');
} else
return array();
}
/**
* Increment the database rate limit count for user $userid and $action by $count within $period
* @param $userid
* @param $action
* @param $period
* @param $count
*/
function qa_db_limits_user_add($userid, $action, $period, $count)
{
qa_db_query_sub(
'INSERT INTO ^userlimits (userid, action, period, count) VALUES ($, $, #, #) ' .
'ON DUPLICATE KEY UPDATE count=IF(period=#, count+#, #), period=#',
$userid, $action, $period, $count, $period, $count, $count, $period
);
}
/**
* Increment the database rate limit count for IP address $ip and $action by $count within $period
* @param $ip
* @param $action
* @param $period
* @param $count
*/
function qa_db_limits_ip_add($ip, $action, $period, $count)
{
qa_db_query_sub(
'INSERT INTO ^iplimits (ip, action, period, count) VALUES (UNHEX($), $, #, #) ' .
'ON DUPLICATE KEY UPDATE count=IF(period=#, count+#, #), period=#',
bin2hex(@inet_pton($ip)), $action, $period, $count, $period, $count, $count, $period
);
}