83 lines
2.7 KiB
PHP
83 lines
2.7 KiB
PHP
<?php
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namespace Sabre\HTTP;
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/**
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* HTTP utility methods
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*
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* @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
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* @author Evert Pot (http://evertpot.com/)
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* @author Paul Voegler
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* @license http://sabre.io/license/ Modified BSD License
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*/
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class Util {
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/**
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* Parses a RFC2616-compatible date string
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*
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* This method returns false if the date is invalid
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*
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* @param string $dateHeader
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* @return bool|DateTime
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*/
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static function parseHTTPDate($dateHeader) {
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//RFC 2616 section 3.3.1 Full Date
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//Only the format is checked, valid ranges are checked by strtotime below
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$month = '(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)';
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$weekday = '(Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday)';
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$wkday = '(Mon|Tue|Wed|Thu|Fri|Sat|Sun)';
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$time = '[0-2]\d(\:[0-5]\d){2}';
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$date3 = $month . ' ([1-3]\d| \d)';
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$date2 = '[0-3]\d\-' . $month . '\-\d\d';
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//4-digit year cannot begin with 0 - unix timestamp begins in 1970
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$date1 = '[0-3]\d ' . $month . ' [1-9]\d{3}';
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//ANSI C's asctime() format
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//4-digit year cannot begin with 0 - unix timestamp begins in 1970
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$asctime_date = $wkday . ' ' . $date3 . ' ' . $time . ' [1-9]\d{3}';
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//RFC 850, obsoleted by RFC 1036
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$rfc850_date = $weekday . ', ' . $date2 . ' ' . $time . ' GMT';
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//RFC 822, updated by RFC 1123
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$rfc1123_date = $wkday . ', ' . $date1 . ' ' . $time . ' GMT';
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//allowed date formats by RFC 2616
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$HTTP_date = "($rfc1123_date|$rfc850_date|$asctime_date)";
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//allow for space around the string and strip it
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$dateHeader = trim($dateHeader, ' ');
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if (!preg_match('/^' . $HTTP_date . '$/', $dateHeader))
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return false;
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//append implicit GMT timezone to ANSI C time format
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if (strpos($dateHeader, ' GMT') === false)
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$dateHeader .= ' GMT';
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$realDate = strtotime($dateHeader);
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//strtotime can return -1 or false in case of error
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if ($realDate !== false && $realDate >= 0)
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return new \DateTime('@' . $realDate, new \DateTimeZone('UTC'));
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}
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/**
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* Transforms a DateTime object to HTTP's most common date format.
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*
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* We're serializing it as the RFC 1123 date, which, for HTTP must be
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* specified as GMT.
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*
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* @param \DateTime $dateTime
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* @return string
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*/
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static function toHTTPDate(\DateTime $dateTime) {
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// We need to clone it, as we don't want to affect the existing
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// DateTime.
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$dateTime = clone $dateTime;
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$dateTime->setTimeZone(new \DateTimeZone('GMT'));
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return $dateTime->format('D, d M Y H:i:s \G\M\T');
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}
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}
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