From 76dac45ebaf104b312a8527a05424601ca9d520a Mon Sep 17 00:00:00 2001
From: ewinslow <ewinslow@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Mon, 6 Sep 2010 02:42:09 +0000
Subject: Refs #2220: Pulled most classes / interfaces out of lib files (except
 query.php and exception.php) into "classes" folder.  Replaced inline classes
 with "require_once" statements for now.  Ran unit tests to verify
 functionality before committing.

git-svn-id: http://code.elgg.org/elgg/trunk@6908 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/classes/ElggHMACCache.php | 94 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 engine/classes/ElggHMACCache.php

(limited to 'engine/classes/ElggHMACCache.php')

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
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