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