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<?php
/**
* ElggHMACCache
* Store cached data in a temporary database, only used by the HMAC stuff.
*
* @package Elgg.Core
* @subpackage HMAC
*/
class ElggHMACCache extends ElggCache {
/**
* Set the Elgg cache.
*
* @param int $max_age Maximum age in seconds, 0 if no limit.
*/
function __construct($max_age = 0) {
$this->setVariable("max_age", $max_age);
}
/**
* Save a key
*
* @param string $key Name
* @param string $data Value
*
* @return boolean
*/
public function save($key, $data) {
global $CONFIG;
$key = sanitise_string($key);
$time = time();
$query = "INSERT into {$CONFIG->dbprefix}hmac_cache (hmac, ts) VALUES ('$key', '$time')";
return insert_data($query);
}
/**
* Load a key
*
* @param string $key Name
* @param int $offset Offset
* @param int $limit Limit
*
* @return string
*/
public function load($key, $offset = 0, $limit = null) {
global $CONFIG;
$key = sanitise_string($key);
$row = get_data_row("SELECT * from {$CONFIG->dbprefix}hmac_cache where hmac='$key'");
if ($row) {
return $row->hmac;
}
return false;
}
/**
* Invalidate a given key.
*
* @param string $key Name
*
* @return bool
*/
public function delete($key) {
global $CONFIG;
$key = sanitise_string($key);
return delete_data("DELETE from {$CONFIG->dbprefix}hmac_cache where hmac='$key'");
}
/**
* Clear out all the contents of the cache.
*
* Not currently implemented in this cache type.
*
* @return true
*/
public function clear() {
return true;
}
/**
* Clean out old stuff.
*
*/
public function __destruct() {
global $CONFIG;
$time = time();
$age = (int)$this->getVariable("max_age");
$expires = $time - $age;
delete_data("DELETE from {$CONFIG->dbprefix}hmac_cache where ts<$expires");
}
}
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