83 lines
2.8 KiB
PHP
83 lines
2.8 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
/**
|
||
|
|
* HTTP utility methods
|
||
|
|
*
|
||
|
|
* @package Sabre
|
||
|
|
* @subpackage HTTP
|
||
|
|
* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
|
||
|
|
* @author Evert Pot (http://www.rooftopsolutions.nl/)
|
||
|
|
* @author Paul Voegler
|
||
|
|
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
|
||
|
|
*/
|
||
|
|
class Sabre_HTTP_Util {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Parses a RFC2616-compatible date string
|
||
|
|
*
|
||
|
|
* This method returns false if the date is invalid
|
||
|
|
*
|
||
|
|
* @param string $dateHeader
|
||
|
|
* @return bool|DateTime
|
||
|
|
*/
|
||
|
|
static function parseHTTPDate($dateHeader) {
|
||
|
|
|
||
|
|
//RFC 2616 section 3.3.1 Full Date
|
||
|
|
//Only the format is checked, valid ranges are checked by strtotime below
|
||
|
|
$month = '(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)';
|
||
|
|
$weekday = '(Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday)';
|
||
|
|
$wkday = '(Mon|Tue|Wed|Thu|Fri|Sat|Sun)';
|
||
|
|
$time = '[0-2]\d(\:[0-5]\d){2}';
|
||
|
|
$date3 = $month . ' ([1-3]\d| \d)';
|
||
|
|
$date2 = '[0-3]\d\-' . $month . '\-\d\d';
|
||
|
|
//4-digit year cannot begin with 0 - unix timestamp begins in 1970
|
||
|
|
$date1 = '[0-3]\d ' . $month . ' [1-9]\d{3}';
|
||
|
|
|
||
|
|
//ANSI C's asctime() format
|
||
|
|
//4-digit year cannot begin with 0 - unix timestamp begins in 1970
|
||
|
|
$asctime_date = $wkday . ' ' . $date3 . ' ' . $time . ' [1-9]\d{3}';
|
||
|
|
//RFC 850, obsoleted by RFC 1036
|
||
|
|
$rfc850_date = $weekday . ', ' . $date2 . ' ' . $time . ' GMT';
|
||
|
|
//RFC 822, updated by RFC 1123
|
||
|
|
$rfc1123_date = $wkday . ', ' . $date1 . ' ' . $time . ' GMT';
|
||
|
|
//allowed date formats by RFC 2616
|
||
|
|
$HTTP_date = "($rfc1123_date|$rfc850_date|$asctime_date)";
|
||
|
|
|
||
|
|
//allow for space around the string and strip it
|
||
|
|
$dateHeader = trim($dateHeader, ' ');
|
||
|
|
if (!preg_match('/^' . $HTTP_date . '$/', $dateHeader))
|
||
|
|
return false;
|
||
|
|
|
||
|
|
//append implicit GMT timezone to ANSI C time format
|
||
|
|
if (strpos($dateHeader, ' GMT') === false)
|
||
|
|
$dateHeader .= ' GMT';
|
||
|
|
|
||
|
|
|
||
|
|
$realDate = strtotime($dateHeader);
|
||
|
|
//strtotime can return -1 or false in case of error
|
||
|
|
if ($realDate !== false && $realDate >= 0)
|
||
|
|
return new DateTime('@' . $realDate, new DateTimeZone('UTC'));
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Transforms a DateTime object to HTTP's most common date format.
|
||
|
|
*
|
||
|
|
* We're serializing it as the RFC 1123 date, which, for HTTP must be
|
||
|
|
* specified as GMT.
|
||
|
|
*
|
||
|
|
* @param DateTime $dateTime
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
static function toHTTPDate(DateTime $dateTime) {
|
||
|
|
|
||
|
|
// We need to clone it, as we don't want to affect the existing
|
||
|
|
// DateTime.
|
||
|
|
$dateTime = clone $dateTime;
|
||
|
|
$dateTime->setTimeZone(new DateTimeZone('GMT'));
|
||
|
|
return $dateTime->format('D, d M Y H:i:s \G\M\T');
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|