1 files changed, 94 insertions, 0 deletions
diff --git a/engine/classes/ElggHMACCache.php b/engine/classes/ElggHMACCache.php
new file mode 100644
index 000000000..8c50d7dfb
--- /dev/null
+++ b/engine/classes/ElggHMACCache.php
@@ -0,0 +1,94 @@
+<?php
+/**
+ * ElggHMACCache
+ * Store cached data in a temporary database, only used by the HMAC stuff.
+ *
+ * @author Curverider Ltd <info@elgg.com>
+ * @package Elgg
+ * @subpackage API
+ */
+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->set_variable("max_age", $max_age);
+	}
+
+	/**
+	 * Save a key
+	 *
+	 * @param string $key
+	 * @param string $data
+	 * @return boolean
+	 */
+	public function save($key, $data) {
+		global $CONFIG;
+
+		$key = sanitise_string($key);
+		$time = time();
+
+		return insert_data("INSERT into {$CONFIG->dbprefix}hmac_cache (hmac, ts) VALUES ('$key', '$time')");
+	}
+
+	/**
+	 * Load a key
+	 *
+	 * @param string $key
+	 * @param int $offset
+	 * @param int $limit
+	 * @return string
+	 */
+	public function load($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 $key
+	 * @return bool
+	 */
+	public function delete($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.
+	 */
+	public function clear() {
+		return true;
+	}
+
+	/**
+	 * Clean out old stuff.
+	 *
+	 */
+	public function __destruct() {
+		global $CONFIG;
+
+		$time = time();
+		$age = (int)$this->get_variable("max_age");
+
+		$expires = $time-$age;
+
+		delete_data("DELETE from {$CONFIG->dbprefix}hmac_cache where ts<$expires");
+	}
+}
+\ No newline at end of file