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