Initial Release of the calendar plugin

dav/SabreDAV/lib/Sabre/DAV/UUIDUtil.php

@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * UUID Utility
+ *
+ * This class has static methods to generate and validate UUID's.
+ * UUIDs are used a decent amount within various *DAV standards, so it made
+ * sense to include it.
+ *
+ * @package Sabre
+ * @subpackage DAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_DAV_UUIDUtil {
+
+    /**
+     * Returns a pseudo-random v4 UUID
+     *
+     * This function is based on a comment by Andrew Moore on php.net
+     *
+     * @see http://www.php.net/manual/en/function.uniqid.php#94959
+     * @return string
+     */
+    static function getUUID() {
+
+        return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
+            // 32 bits for "time_low"
+            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
+
+            // 16 bits for "time_mid"
+            mt_rand( 0, 0xffff ),
+
+            // 16 bits for "time_hi_and_version",
+            // four most significant bits holds version number 4
+            mt_rand( 0, 0x0fff ) | 0x4000,
+
+            // 16 bits, 8 bits for "clk_seq_hi_res",
+            // 8 bits for "clk_seq_low",
+            // two most significant bits holds zero and one for variant DCE1.1
+            mt_rand( 0, 0x3fff ) | 0x8000,
+
+            // 48 bits for "node"
+            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
+        );
+    }
+
+    /**
+     * Checks if a string is a valid UUID.
+     *
+     * @param string $uuid
+     * @return bool
+     */
+    static function validateUUID($uuid) {
+
+        return preg_match(
+            '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',
+            $uuid
+        ) == true;
+
+    }
+
+}