From 3019e5cfdd49426e96eb5a37c9217d4bc16584f6 Mon Sep 17 00:00:00 2001
From: Olav Morken <olav.morken@uninett.no>
Date: Mon, 8 Sep 2008 13:30:20 +0000
Subject: [PATCH] Utilities: Add code to parse a duration.
git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@860 44740490-163a-0410-bde0-09ae8108e29a
---
lib/SimpleSAML/Utilities.php | 83 ++++++++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)
diff --git a/lib/SimpleSAML/Utilities.php b/lib/SimpleSAML/Utilities.php
index daf57e59f..033f0f691 100644
--- a/lib/SimpleSAML/Utilities.php
+++ b/lib/SimpleSAML/Utilities.php
@@ -392,6 +392,89 @@ class SimpleSAML_Utilities {
}
+ /**
+ * Interpret a ISO8601 duration value relative to a given timestamp.
+ *
+ * @param string $duration The duration, as a string.
+ * @param int $timestamp The unix timestamp we should apply the duration to. Optional, default
+ * to the current time.
+ * @return int The new timestamp, after the duration is applied.
+ */
+ public static function parseDuration($duration, $timestamp = NULL) {
+ assert('is_string($duration)');
+ assert('is_null($timestamp) || is_int($timestamp)');
+
+ /* Parse the duration. We use a very strict pattern. */
+ $durationRegEx = '#^(-?)P(?:(?:(?:(\\d+)Y)?(?:(\\d+)M)?(?:(\\d+)D)?(?:T(?:(\\d+)H)?(?:(\\d+)M)?(?:(\\d+)S)?)?)|(?:(\\d+)W))$#';
+ if (!preg_match($durationRegEx, $duration, $matches)) {
+ throw new Exception('Invalid ISO 8601 duration: ' . $duration);
+ }
+
+ $durYears = (empty($matches[2]) ? 0 : (int)$matches[2]);
+ $durMonths = (empty($matches[3]) ? 0 : (int)$matches[3]);
+ $durDays = (empty($matches[4]) ? 0 : (int)$matches[4]);
+ $durHours = (empty($matches[5]) ? 0 : (int)$matches[5]);
+ $durMinutes = (empty($matches[6]) ? 0 : (int)$matches[6]);
+ $durSeconds = (empty($matches[7]) ? 0 : (int)$matches[7]);
+ $durWeeks = (empty($matches[8]) ? 0 : (int)$matches[8]);
+
+ if (!empty($matches[1])) {
+ /* Negative */
+ $durYears = -$durYears;
+ $durMonths = -$durMonths;
+ $durDays = -$durDays;
+ $durHours = -$durHours;
+ $durMinutes = -$durMinutes;
+ $durSeconds = -$durSeconds;
+ $durWeeks = -$durWeeks;
+ }
+
+ if ($timestamp === NULL) {
+ $timestamp = time();
+ }
+
+ if ($durYears !== 0 || $durMonths !== 0) {
+ /* Special handling of months and years, since they aren't a specific interval, but
+ * instead depend on the current time.
+ */
+
+ /* We need the year and month from the timestamp. Unfortunately, PHP doesn't have the
+ * gmtime function. Instead we use the gmdate function, and split the result.
+ */
+ $yearmonth = explode(':', gmdate('Y:n', $timestamp));
+ $year = (int)($yearmonth[0]);
+ $month = (int)($yearmonth[1]);
+
+ /* Remove the year and month from the timestamp. */
+ $timestamp -= gmmktime(0, 0, 0, $month, 1, $year);
+
+ /* Add years and months, and normalize the numbers afterwards. */
+ $year += $durYears;
+ $month += $durMonths;
+ while ($month > 12) {
+ $year += 1;
+ $month -= 12;
+ }
+ while ($month < 1) {
+ $year -= 1;
+ $month += 12;
+ }
+
+ /* Add year and month back into timestamp. */
+ $timestamp += gmmktime(0, 0, 0, $month, 1, $year);
+ }
+
+ /* Add the other elements. */
+ $timestamp += $durWeeks * 7 * 24 * 60 * 60;
+ $timestamp += $durDays * 24 * 60 * 60;
+ $timestamp += $durHours * 60 * 60;
+ $timestamp += $durMinutes * 60;
+ $timestamp += $durSecods;
+
+ return $timestamp;
+ }
+
+
/**
* Show and log fatal error message.
*
--
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