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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)
));
}
}
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