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-rw-r--r--library/Icinga/Util/ASN1.php102
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diff --git a/library/Icinga/Util/ASN1.php b/library/Icinga/Util/ASN1.php
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+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use DateInterval;
+use DateTime;
+use InvalidArgumentException;
+
+/**
+ * Parsers for ASN.1 types
+ */
+class ASN1
+{
+ /**
+ * Parse the given value based on the "3.3.13. Generalized Time" syntax as specified by IETF RFC 4517
+ *
+ * @param string $value
+ *
+ * @return DateTime
+ *
+ * @throws InvalidArgumentException
+ *
+ * @see https://tools.ietf.org/html/rfc4517#section-3.3.13
+ */
+ public static function parseGeneralizedTime($value)
+ {
+ $generalizedTimePattern = <<<EOD
+/\A
+ (?P<YmdH>
+ [0-9]{4} # century year
+ (?:0[1-9]|1[0-2]) # month
+ (?:0[1-9]|[12][0-9]|3[0-1]) # day
+ (?:[01][0-9]|2[0-3]) # hour
+ )
+ (?:
+ (?P<i>[0-5][0-9]) # minute
+ (?P<s>[0-5][0-9]|60)? # second or leap-second
+ )?
+ (?:[.,](?P<frac>[0-9]+))? # fraction
+ (?P<tz> # g-time-zone
+ Z
+ |
+ [-+]
+ (?:[01][0-9]|2[0-3]) # hour
+ (?:[0-5][0-9])? # minute
+ )
+\z/x
+EOD;
+
+ $matches = array();
+
+ if (preg_match($generalizedTimePattern, $value, $matches)) {
+ $dateTimeRaw = $matches['YmdH'];
+ $dateTimeFormat = 'YmdH';
+
+ if ($matches['i'] !== '') {
+ $dateTimeRaw .= $matches['i'];
+ $dateTimeFormat .= 'i';
+
+ if ($matches['s'] !== '') {
+ $dateTimeRaw .= $matches['s'];
+ $dateTimeFormat .= 's';
+ $fractionOfSeconds = 1;
+ } else {
+ $fractionOfSeconds = 60;
+ }
+ } else {
+ $fractionOfSeconds = 3600;
+ }
+
+ $dateTimeFormat .= 'O';
+
+ if ($matches['tz'] === 'Z') {
+ $dateTimeRaw .= '+0000';
+ } else {
+ $dateTimeRaw .= $matches['tz'];
+
+ if (strlen($matches['tz']) === 3) {
+ $dateTimeRaw .= '00';
+ }
+ }
+
+ $dateTime = DateTime::createFromFormat($dateTimeFormat, $dateTimeRaw);
+
+ if ($dateTime !== false) {
+ if (isset($matches['frac'])) {
+ $dateTime->add(new DateInterval(
+ 'PT' . round((float) ('0.' . $matches['frac']) * $fractionOfSeconds) . 'S'
+ ));
+ }
+
+ return $dateTime;
+ }
+ }
+
+ throw new InvalidArgumentException(sprintf(
+ 'Failed to parse %s based on the ASN.1 standard (GeneralizedTime)',
+ var_export($value, true)
+ ));
+ }
+}