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<?php
/*
Question2Answer by Gideon Greenspan and contributors
http://www.question2answer.org/
Description: Database access functions for user cookies
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;
}
/**
* Create a new random cookie for $ipaddress and insert into database, returning it
* @param $ipaddress
* @return null|string
*/
function qa_db_cookie_create($ipaddress)
{
for ($attempt = 0; $attempt < 10; $attempt++) {
$cookieid = qa_db_random_bigint();
if (qa_db_cookie_exists($cookieid))
continue;
qa_db_query_sub(
'INSERT INTO ^cookies (cookieid, created, createip) ' .
'VALUES (#, NOW(), UNHEX($))',
$cookieid, bin2hex(@inet_pton($ipaddress))
);
return $cookieid;
}
return null;
}
/**
* Note in database that a write operation has been done by user identified by $cookieid and from $ipaddress
* @param $cookieid
* @param $ipaddress
*/
function qa_db_cookie_written($cookieid, $ipaddress)
{
qa_db_query_sub(
'UPDATE ^cookies SET written=NOW(), writeip=UNHEX($) WHERE cookieid=#',
bin2hex(@inet_pton($ipaddress)), $cookieid
);
}
/**
* Return whether $cookieid exists in database
* @param $cookieid
* @return bool
*/
function qa_db_cookie_exists($cookieid)
{
$cookie = qa_db_read_one_value(qa_db_query_sub(
'SELECT COUNT(*) FROM ^cookies WHERE cookieid=#',
$cookieid
));
return $cookie > 0;
}