/usr/share/php/sabre21/Sabre/HTTP/Util.php is in php-sabre-http-3 3.0.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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namespace Sabre\HTTP;
/**
* HTTP utility methods
*
* @copyright Copyright (C) 2009-2015 fruux GmbH (https://fruux.com/).
* @author Evert Pot (http://evertpot.com/)
* @author Paul Voegler
* @license http://sabre.io/license/ Modified BSD License
*/
class 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 = '([0-1]\d|2[0-3])(\:[0-5]\d){2}';
$date3 = $month . ' ([12]\d|3[01]| [1-9])';
$date2 = '(0[1-9]|[12]\d|3[01])\-' . $month . '\-\d{2}';
//4-digit year cannot begin with 0 - unix timestamp begins in 1970
$date1 = '(0[1-9]|[12]\d|3[01]) ' . $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');
}
/**
* This method can be used to aid with content negotiation.
*
* It takes 2 arguments, the $acceptHeaderValue, which usually comes from
* an Accept header, and $availableOptions, which contains an array of
* items that the server can support.
*
* The result of this function will be the 'best possible option'. If no
* best possible option could be found, null is returned.
*
* When it's null you can according to the spec either return a default, or
* you can choose to emit 406 Not Acceptable.
*
* The method also accepts sending 'null' for the $acceptHeaderValue,
* implying that no accept header was sent.
*
* @param string|null $acceptHeaderValue
* @param array $availableOptions
* @return string|null
*/
static function negotiateContentType($acceptHeaderValue, array $availableOptions) {
if (!$acceptHeaderValue) {
// Grabbing the first in the list.
return reset($availableOptions);
}
$proposals = array_map(
['self', 'parseMimeType'],
explode(',', $acceptHeaderValue)
);
// Ensuring array keys are reset.
$availableOptions = array_values($availableOptions);
$options = array_map(
['self', 'parseMimeType'],
$availableOptions
);
$lastQuality = 0;
$lastSpecificity = 0;
$lastOptionIndex = 0;
$lastChoice = null;
foreach($proposals as $proposal) {
// Ignoring broken values.
if (is_null($proposal)) continue;
// If the quality is lower we don't have to bother comparing.
if ($proposal['quality'] < $lastQuality) {
continue;
}
foreach($options as $optionIndex => $option) {
if ($proposal['type'] !== '*' && $proposal['type'] !== $option['type']) {
// no match on type.
continue;
}
if ($proposal['subType'] !== '*' && $proposal['subType'] !== $option['subType']) {
// no match on subtype.
continue;
}
// Any parameters appearing on the options must appear on
// proposals.
foreach($option['parameters'] as $paramName => $paramValue) {
if (!array_key_exists($paramName, $proposal['parameters'])) {
continue 2;
}
if ($paramValue !== $proposal['parameters'][$paramName]) {
continue 2;
}
}
// If we got here, we have a match on parameters, type and
// subtype. We need to calculate a score for how specific the
// match was.
$specificity =
($proposal['type']!=='*'?20:0) +
($proposal['subType']!=='*'?10:0) +
count($option['parameters']);
// Does this entry win?
if (
($proposal['quality'] > $lastQuality) ||
($proposal['quality'] === $lastQuality && $specificity > $lastSpecificity) ||
($proposal['quality'] === $lastQuality && $specificity === $lastSpecificity && $optionIndex < $lastOptionIndex)
) {
$lastQuality = $proposal['quality'];
$lastSpecificity = $specificity;
$lastOptionIndex = $optionIndex;
$lastChoice = $availableOptions[$optionIndex];
}
}
}
return $lastChoice;
}
/**
* Parses a mime-type and splits it into:
*
* 1. type
* 2. subtype
* 3. quality
* 4. parameters
*
* @param string $str
* @return array
*/
private static function parseMimeType($str) {
$parameters = [];
// If no q= parameter appears, then quality = 1.
$quality = 1;
$parts = explode(';', $str);
// The first part is the mime-type.
$mimeType = array_shift($parts);
$mimeType = explode('/', trim($mimeType));
if (count($mimeType)!==2) {
// Illegal value
return null;
}
list($type, $subType) = $mimeType;
foreach($parts as $part) {
$part = trim($part);
if (strpos($part, '=')) {
list($partName, $partValue) =
explode('=', $part, 2);
} else {
$partName = $part;
$partValue = null;
}
// The quality parameter, if it appears, also marks the end of
// the parameter list. Anything after the q= counts as an
// 'accept extension' and could introduce new semantics in
// content-negotation.
if ($partName!=='q') {
$parameters[$partName] = $part;
} else {
$quality = (float)$partValue;
break; // Stop parsing parts
}
}
return [
'type' => $type,
'subType' => $subType,
'quality' => $quality,
'parameters' => $parameters,
];
}
/**
* Deprecated! Use negotiateContentType.
*
* @deprecated
* @param string|null $acceptHeader
* @param array $availableOptions
* @return string|null
*/
static function negotiate($acceptHeaderValue, array $availableOptions) {
return self::negotiateContentType($acceptHeaderValue, $availableOptions);
}
}
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